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<?php
/**
* lessphp v0.4.0
* http://leafo.net/lessphp
*
* LESS css compiler, adapted from http://lesscss.org
*
* @copyright Copyright 2012, Leaf Corcoran <leafot@gmail.com>
* @license Licensed under MIT or GPLv3, see LICENSE
*/
/**
* The less compiler and parser.
*
* Converting LESS to CSS is a three stage process. The incoming file is parsed
* by `lessc_parser` into a syntax tree, then it is compiled into another tree
* representing the CSS structure by `lessc`. The CSS tree is fed into a
* formatter, like `lessc_formatter` which then outputs CSS as a string.
*
* During the first compile, all values are *reduced*, which means that their
* types are brought to the lowest form before being dump as strings. This
* handles math equations, variable dereferences, and the like.
*
* The `parse` function of `lessc` is the entry point.
*
* In summary:
*
* The `lessc` class creates an intstance of the parser, feeds it LESS code,
* then transforms the resulting tree to a CSS tree. This class also holds the
* evaluation context, such as all available mixins and variables at any given
* time.
*
* The `lessc_parser` class is only concerned with parsing its input.
*
* The `lessc_formatter` takes a CSS tree, and dumps it to a formatted string,
* handling things like indentation.
*
* @since LESSC
*/
class lessc
{
/**
* @var string
* @since LESSC
*/
public static $VERSION = "v0.4.0";
/**
* @var array
* @since LESSC
*/
protected static $TRUE = ["keyword", "true"];
/**
* @var array
* @since LESSC
*/
protected static $FALSE = ["keyword", "false"];
/**
* @var array
* @since LESSC
*/
protected $libFunctions = [];
/**
* @var array
* @since LESSC
*/
protected $registeredVars = [];
/**
* @var bool
* @since LESSC
*/
protected $preserveComments = false;
/**
* @var string
* @since LESSC
*/
public $vPrefix = '@'; // prefix of abstract properties
/**
* @var string
* @since LESSC
*/
public $mPrefix = '$'; // prefix of abstract blocks
/**
* @var string
* @since LESSC
*/
public $parentSelector = '&';
/**
* @var bool
* @since LESSC
*/
public $importDisabled = false;
/**
* @var string
* @since LESSC
*/
public $importDir = '';
/**
* @var null
* @since LESSC
*/
protected $numberPrecision = null;
/**
* @var array
* @since LESSC
*/
protected $allParsedFiles = [];
// set to the parser that generated the current line when compiling
// so we know how to create error messages
/**
* @var null
* @since LESSC
*/
protected $sourceParser = null;
/**
* @var null
* @since LESSC
*/
protected $sourceLoc = null;
/**
* @var array
* @since LESSC
*/
public static $defaultValue = ["keyword", ""];
/**
* @var int
* @since LESSC
*/
protected static $nextImportId = 0; // uniquely identify imports
// attempts to find the path of an import url, returns null for css files
/**
* @param $url
*
* @return null|string
* @since LESSC
*/
protected function findImport($url)
{
foreach ((array) $this->importDir as $dir)
{
$full = $dir . (substr($dir, -1) != '/' ? '/' : '') . $url;
if ($this->fileExists($file = $full . '.less') || $this->fileExists($file = $full))
{
return $file;
}
}
return;
}
/**
* @param $name
*
* @return bool
* @since LESSC
*/
protected function fileExists($name)
{
return is_file($name);
}
/**
* @param $items
* @param $delim
*
* @return array
* @since LESSC
*/
public static function compressList($items, $delim)
{
if (!isset($items[1]) && isset($items[0]))
{
return $items[0];
}
else
{
return ['list', $delim, $items];
}
}
/**
* @param $what
*
* @return string
* @since LESSC
*/
public static function preg_quote($what)
{
return preg_quote($what, '/');
}
/**
* @param $importPath
* @param $parentBlock
* @param $out
*
* @return array|bool
* @since LESSC
* @throws \Exception
*/
protected function tryImport($importPath, $parentBlock, $out)
{
if ($importPath[0] == "function" && $importPath[1] == "url")
{
$importPath = $this->flattenList($importPath[2]);
}
$str = $this->coerceString($importPath);
if ($str === null)
{
return false;
}
$url = $this->compileValue($this->lib_e($str));
// don't import if it ends in css
if (substr_compare($url, '.css', -4, 4) === 0)
{
return false;
}
$realPath = $this->findImport($url);
if ($realPath === null)
{
return false;
}
if ($this->importDisabled)
{
return [false, "/* import disabled */"];
}
if (isset($this->allParsedFiles[realpath($realPath)]))
{
return [false, null];
}
$this->addParsedFile($realPath);
$parser = $this->makeParser($realPath);
$root = $parser->parse(file_get_contents($realPath));
// set the parents of all the block props
foreach ($root->props as $prop)
{
if ($prop[0] == "block")
{
$prop[1]->parent = $parentBlock;
}
}
// copy mixins into scope, set their parents
// bring blocks from import into current block
// TODO: need to mark the source parser these came from this file
foreach ($root->children as $childName => $child)
{
if (isset($parentBlock->children[$childName]))
{
$parentBlock->children[$childName] = array_merge(
$parentBlock->children[$childName],
$child);
}
else
{
$parentBlock->children[$childName] = $child;
}
}
$pi = pathinfo($realPath);
$dir = $pi["dirname"];
list($top, $bottom) = $this->sortProps($root->props, true);
$this->compileImportedProps($top, $parentBlock, $out, $parser, $dir);
return [true, $bottom, $parser, $dir];
}
/**
* @param $props
* @param $block
* @param $out
* @param $sourceParser
* @param $importDir
*
* @since LESSC
* @throws \Exception
*/
protected function compileImportedProps($props, $block, $out, $sourceParser, $importDir)
{
$oldSourceParser = $this->sourceParser;
$oldImport = $this->importDir;
// TODO: this is because the importDir api is stupid
$this->importDir = (array) $this->importDir;
array_unshift($this->importDir, $importDir);
foreach ($props as $prop)
{
$this->compileProp($prop, $block, $out);
}
$this->importDir = $oldImport;
$this->sourceParser = $oldSourceParser;
}
/**
* Recursively compiles a block.
*
* A block is analogous to a CSS block in most cases. A single LESS document
* is encapsulated in a block when parsed, but it does not have parent tags
* so all of it's children appear on the root level when compiled.
*
* Blocks are made up of props and children.
*
* Props are property instructions, array tuples which describe an action
* to be taken, eg. write a property, set a variable, mixin a block.
*
* The children of a block are just all the blocks that are defined within.
* This is used to look up mixins when performing a mixin.
*
* Compiling the block involves pushing a fresh environment on the stack,
* and iterating through the props, compiling each one.
*
* See lessc::compileProp()
*
* @param $block
*
* @since LESSC
* @throws \Exception
*/
protected function compileBlock($block)
{
switch ($block->type)
{
case "root":
$this->compileRoot($block);
break;
case null:
$this->compileCSSBlock($block);
break;
case "media":
$this->compileMedia($block);
break;
case "directive":
$name = "@" . $block->name;
if (!empty($block->value))
{
$name .= " " . $this->compileValue($this->reduce($block->value));
}
$this->compileNestedBlock($block, [$name]);
break;
default:
$this->throwError("unknown block type: $block->type\n");
}
}
/**
* @param $block
*
* @since LESSC
* @throws \Exception
*/
protected function compileCSSBlock($block)
{
$env = $this->pushEnv();
$selectors = $this->compileSelectors($block->tags);
$env->selectors = $this->multiplySelectors($selectors);
$out = $this->makeOutputBlock(null, $env->selectors);
$this->scope->children[] = $out;
$this->compileProps($block, $out);
$block->scope = $env; // mixins carry scope with them!
$this->popEnv();
}
/**
* @param $media
*
* @since LESSC
* @throws \Exception
*/
protected function compileMedia($media)
{
$env = $this->pushEnv($media);
$parentScope = $this->mediaParent($this->scope);
$query = $this->compileMediaQuery($this->multiplyMedia($env));
$this->scope = $this->makeOutputBlock($media->type, [$query]);
$parentScope->children[] = $this->scope;
$this->compileProps($media, $this->scope);
if (count($this->scope->lines) > 0)
{
$orphanSelelectors = $this->findClosestSelectors();
if ($orphanSelelectors !== null)
{
$orphan = $this->makeOutputBlock(null, $orphanSelelectors);
$orphan->lines = $this->scope->lines;
array_unshift($this->scope->children, $orphan);
$this->scope->lines = [];
}
}
$this->scope = $this->scope->parent;
$this->popEnv();
}
/**
* @param $scope
*
* @return mixed
* @since LESSC
*/
protected function mediaParent($scope)
{
while (!empty($scope->parent))
{
if (!empty($scope->type) && $scope->type != "media")
{
break;
}
$scope = $scope->parent;
}
return $scope;
}
/**
* @param $block
* @param $selectors
*
* @since LESSC
* @throws \Exception
*/
protected function compileNestedBlock($block, $selectors)
{
$this->pushEnv($block);
$this->scope = $this->makeOutputBlock($block->type, $selectors);
$this->scope->parent->children[] = $this->scope;
$this->compileProps($block, $this->scope);
$this->scope = $this->scope->parent;
$this->popEnv();
}
/**
* @param $root
*
* @since LESSC
* @throws \Exception
*/
protected function compileRoot($root)
{
$this->pushEnv();
$this->scope = $this->makeOutputBlock($root->type);
$this->compileProps($root, $this->scope);
$this->popEnv();
}
/**
* @param $block
* @param $out
*
* @since LESSC
* @throws \Exception
*/
protected function compileProps($block, $out)
{
foreach ($this->sortProps($block->props) as $prop)
{
$this->compileProp($prop, $block, $out);
}
$out->lines = array_values(array_unique($out->lines));
}
/**
* @param $props
* @param bool $split
*
* @return array
* @since LESSC
*/
protected function sortProps($props, $split = false)
{
$vars = [];
$imports = [];
$other = [];
foreach ($props as $prop)
{
switch ($prop[0])
{
case "assign":
if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix)
{
$vars[] = $prop;
}
else
{
$other[] = $prop;
}
break;
case "import":
$id = self::$nextImportId++;
$prop[] = $id;
$imports[] = $prop;
$other[] = ["import_mixin", $id];
break;
default:
$other[] = $prop;
}
}
if ($split)
{
return [array_merge($vars, $imports), $other];
}
else
{
return array_merge($vars, $imports, $other);
}
}
/**
* @param $queries
*
* @return string
* @since LESSC
* @throws \Exception
*/
protected function compileMediaQuery($queries)
{
$compiledQueries = [];
foreach ($queries as $query)
{
$parts = [];
foreach ($query as $q)
{
switch ($q[0])
{
case "mediaType":
$parts[] = implode(" ", array_slice($q, 1));
break;
case "mediaExp":
if (isset($q[2]))
{
$parts[] = "($q[1]: " .
$this->compileValue($this->reduce($q[2])) . ")";
}
else
{
$parts[] = "($q[1])";
}
break;
case "variable":
$parts[] = $this->compileValue($this->reduce($q));
break;
}
}
if (count($parts) > 0)
{
$compiledQueries[] = implode(" and ", $parts);
}
}
$out = "@media";
if (!empty($parts))
{
$out .= " " .
implode($this->formatter->selectorSeparator, $compiledQueries);
}
return $out;
}
/**
* @param $env
* @param null $childQueries
*
* @return null
* @since LESSC
*/
protected function multiplyMedia($env, $childQueries = null)
{
if (is_null($env) ||
!empty($env->block->type) && $env->block->type != "media"
)
{
return $childQueries;
}
// plain old block, skip
if (empty($env->block->type))
{
return $this->multiplyMedia($env->parent, $childQueries);
}
$out = [];
$queries = $env->block->queries;
if (is_null($childQueries))
{
$out = $queries;
}
else
{
foreach ($queries as $parent)
{
foreach ($childQueries as $child)
{
$out[] = array_merge($parent, $child);
}
}
}
return $this->multiplyMedia($env->parent, $out);
}
/**
* @param $tag
* @param $replace
*
* @return int
* @since LESSC
*/
protected function expandParentSelectors(&$tag, $replace)
{
$parts = explode("$&$", $tag);
$count = 0;
foreach ($parts as &$part)
{
$part = str_replace($this->parentSelector, $replace, $part, $c);
$count += $c;
}
$tag = implode($this->parentSelector, $parts);
return $count;
}
/**
* @return null
* @since LESSC
*/
protected function findClosestSelectors()
{
$env = $this->env;
$selectors = null;
while ($env !== null)
{
if (isset($env->selectors))
{
$selectors = $env->selectors;
break;
}
$env = $env->parent;
}
return $selectors;
}
// multiply $selectors against the nearest selectors in env
/**
* @param $selectors
*
* @return array
* @since LESSC
*/
protected function multiplySelectors($selectors)
{
// find parent selectors
$parentSelectors = $this->findClosestSelectors();
if (is_null($parentSelectors))
{
// kill parent reference in top level selector
foreach ($selectors as &$s)
{
$this->expandParentSelectors($s, "");
}
return $selectors;
}
$out = [];
foreach ($parentSelectors as $parent)
{
foreach ($selectors as $child)
{
$count = $this->expandParentSelectors($child, $parent);
// don't prepend the parent tag if & was used
if ($count > 0)
{
$out[] = trim($child);
}
else
{
$out[] = trim($parent . ' ' . $child);
}
}
}
return $out;
}
// reduces selector expressions
/**
* @param $selectors
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function compileSelectors($selectors)
{
$out = [];
foreach ($selectors as $s)
{
if (is_array($s))
{
list(, $value) = $s;
$out[] = trim($this->compileValue($this->reduce($value)));
}
else
{
$out[] = $s;
}
}
return $out;
}
/**
* @param $left
* @param $right
*
* @return bool
* @since LESSC
*/
protected function eq($left, $right)
{
return $left == $right;
}
/**
* @param $block
* @param $orderedArgs
* @param $keywordArgs
*
* @return bool
* @since LESSC
* @throws \Exception
*/
protected function patternMatch($block, $orderedArgs, $keywordArgs)
{
// match the guards if it has them
// any one of the groups must have all its guards pass for a match
if (!empty($block->guards))
{
$groupPassed = false;
foreach ($block->guards as $guardGroup)
{
foreach ($guardGroup as $guard)
{
$this->pushEnv();
$this->zipSetArgs($block->args, $orderedArgs, $keywordArgs);
$negate = false;
if ($guard[0] == "negate")
{
$guard = $guard[1];
$negate = true;
}
$passed = $this->reduce($guard) == self::$TRUE;
if ($negate) $passed = !$passed;
$this->popEnv();
if ($passed)
{
$groupPassed = true;
}
else
{
$groupPassed = false;
break;
}
}
if ($groupPassed) break;
}
if (!$groupPassed)
{
return false;
}
}
if (empty($block->args))
{
return $block->isVararg || empty($orderedArgs) && empty($keywordArgs);
}
$remainingArgs = $block->args;
if ($keywordArgs)
{
$remainingArgs = [];
foreach ($block->args as $arg)
{
if ($arg[0] == "arg" && isset($keywordArgs[$arg[1]]))
{
continue;
}
$remainingArgs[] = $arg;
}
}
$i = -1; // no args
// try to match by arity or by argument literal
foreach ($remainingArgs as $i => $arg)
{
switch ($arg[0])
{
case "lit":
if (empty($orderedArgs[$i]) || !$this->eq($arg[1], $orderedArgs[$i]))
{
return false;
}
break;
case "arg":
// no arg and no default value
if (!isset($orderedArgs[$i]) && !isset($arg[2]))
{
return false;
}
break;
case "rest":
$i--; // rest can be empty
break 2;
}
}
if ($block->isVararg)
{
return true; // not having enough is handled above
}
else
{
$numMatched = $i + 1;
// greater than becuase default values always match
return $numMatched >= count($orderedArgs);
}
}
/**
* @param $blocks
* @param $orderedArgs
* @param $keywordArgs
* @param array $skip
*
* @return array|null
* @since LESSC
* @throws \Exception
*/
protected function patternMatchAll($blocks, $orderedArgs, $keywordArgs, $skip = [])
{
$matches = null;
foreach ($blocks as $block)
{
// skip seen blocks that don't have arguments
if (isset($skip[$block->id]) && !isset($block->args))
{
continue;
}
if ($this->patternMatch($block, $orderedArgs, $keywordArgs))
{
$matches[] = $block;
}
}
return $matches;
}
// attempt to find blocks matched by path and args
/**
* @param $searchIn
* @param $path
* @param $orderedArgs
* @param $keywordArgs
* @param array $seen
*
* @return array|null
* @since LESSC
* @throws \Exception
*/
protected function findBlocks($searchIn, $path, $orderedArgs, $keywordArgs, $seen = [])
{
if ($searchIn == null)
{
return;
}
if (isset($seen[$searchIn->id]))
{
return;
}
$seen[$searchIn->id] = true;
$name = $path[0];
if (isset($searchIn->children[$name]))
{
$blocks = $searchIn->children[$name];
if (count($path) == 1)
{
$matches = $this->patternMatchAll($blocks, $orderedArgs, $keywordArgs, $seen);
if (!empty($matches))
{
// This will return all blocks that match in the closest
// scope that has any matching block, like lessjs
return $matches;
}
}
else
{
$matches = [];
foreach ($blocks as $subBlock)
{
$subMatches = $this->findBlocks($subBlock,
array_slice($path, 1), $orderedArgs, $keywordArgs, $seen);
if ($subMatches !== null)
{
foreach ($subMatches as $sm)
{
$matches[] = $sm;
}
}
}
return count($matches) > 0 ? $matches : null;
}
}
if ($searchIn->parent === $searchIn)
{
return;
}
return $this->findBlocks($searchIn->parent, $path, $orderedArgs, $keywordArgs, $seen);
}
// sets all argument names in $args to either the default value
// or the one passed in through $values
/**
* @param $args
* @param $orderedValues
* @param $keywordValues
*
* @since LESSC
* @throws \Exception
*/
protected function zipSetArgs($args, $orderedValues, $keywordValues)
{
$assignedValues = [];
$i = 0;
foreach ($args as $a)
{
if ($a[0] == "arg")
{
if (isset($keywordValues[$a[1]]))
{
// has keyword arg
$value = $keywordValues[$a[1]];
}
elseif (isset($orderedValues[$i]))
{
// has ordered arg
$value = $orderedValues[$i];
$i++;
}
elseif (isset($a[2]))
{
// has default value
$value = $a[2];
}
else
{
$this->throwError("Failed to assign arg " . $a[1]);
$value = null; // :(
}
$value = $this->reduce($value);
$this->set($a[1], $value);
$assignedValues[] = $value;
}
else
{
// a lit
$i++;
}
}
// check for a rest
$last = end($args);
if ($last[0] == "rest")
{
$rest = array_slice($orderedValues, count($args) - 1);
$this->set($last[1], $this->reduce(["list", " ", $rest]));
}
// wow is this the only true use of PHP's + operator for arrays?
$this->env->arguments = $assignedValues + $orderedValues;
}
// compile a prop and update $lines or $blocks appropriately
/**
* @param $prop
* @param $block
* @param $out
*
* @since LESSC
* @throws \Exception
*/
protected function compileProp($prop, $block, $out)
{
// set error position context
$this->sourceLoc = isset($prop[-1]) ? $prop[-1] : -1;
switch ($prop[0])
{
case 'assign':
list(, $name, $value) = $prop;
if ($name[0] == $this->vPrefix)
{
$this->set($name, $value);
}
else
{
$out->lines[] = $this->formatter->property($name,
$this->compileValue($this->reduce($value)));
}
break;
case 'block':
list(, $child) = $prop;
$this->compileBlock($child);
break;
case 'mixin':
list(, $path, $args, $suffix) = $prop;
$orderedArgs = [];
$keywordArgs = [];
foreach ((array) $args as $arg)
{
$argval = null;
switch ($arg[0])
{
case "arg":
if (!isset($arg[2]))
{
$orderedArgs[] = $this->reduce(["variable", $arg[1]]);
}
else
{
$keywordArgs[$arg[1]] = $this->reduce($arg[2]);
}
break;
case "lit":
$orderedArgs[] = $this->reduce($arg[1]);
break;
default:
$this->throwError("Unknown arg type: " . $arg[0]);
}
}
$mixins = $this->findBlocks($block, $path, $orderedArgs, $keywordArgs);
if ($mixins === null)
{
// fwrite(STDERR,"failed to find block: ".implode(" > ", $path)."\n");
break; // throw error here??
}
foreach ($mixins as $mixin)
{
if ($mixin === $block && !$orderedArgs)
{
continue;
}
$haveScope = false;
if (isset($mixin->parent->scope))
{
$haveScope = true;
$mixinParentEnv = $this->pushEnv();
$mixinParentEnv->storeParent = $mixin->parent->scope;
}
$haveArgs = false;
if (isset($mixin->args))
{
$haveArgs = true;
$this->pushEnv();
$this->zipSetArgs($mixin->args, $orderedArgs, $keywordArgs);
}
$oldParent = $mixin->parent;
if ($mixin != $block)
{
$mixin->parent = $block;
}
foreach ($this->sortProps($mixin->props) as $subProp)
{
if ($suffix !== null &&
$subProp[0] == "assign" &&
is_string($subProp[1]) &&
$subProp[1][0] != $this->vPrefix
)
{
$subProp[2] = [
'list', ' ',
[$subProp[2], ['keyword', $suffix]],
];
}
$this->compileProp($subProp, $mixin, $out);
}
$mixin->parent = $oldParent;
if ($haveArgs)
{
$this->popEnv();
}
if ($haveScope)
{
$this->popEnv();
}
}
break;
case 'raw':
$out->lines[] = $prop[1];
break;
case "directive":
list(, $name, $value) = $prop;
$out->lines[] = "@$name " . $this->compileValue($this->reduce($value)) . ';';
break;
case "comment":
$out->lines[] = $prop[1];
break;
case "import";
list(, $importPath, $importId) = $prop;
$importPath = $this->reduce($importPath);
if (!isset($this->env->imports))
{
$this->env->imports = [];
}
$result = $this->tryImport($importPath, $block, $out);
$this->env->imports[$importId] = $result === false ?
[false, "@import " . $this->compileValue($importPath) . ";"] :
$result;
break;
case "import_mixin":
list(, $importId) = $prop;
$import = $this->env->imports[$importId];
if ($import[0] === false)
{
if (isset($import[1]))
{
$out->lines[] = $import[1];
}
}
else
{
list(, $bottom, $parser, $importDir) = $import;
$this->compileImportedProps($bottom, $block, $out, $parser, $importDir);
}
break;
default:
$this->throwError("unknown op: {$prop[0]}\n");
}
}
/**
* Compiles a primitive value into a CSS property value.
*
* Values in lessphp are typed by being wrapped in arrays, their format is
* typically:
*
* array(type, contents [, additional_contents]*)
*
* The input is expected to be reduced. This function will not work on
* things like expressions and variables.
*
* @param $value
*
* @return string
* @since LESSC
* @throws \Exception
*/
protected function compileValue($value)
{
switch ($value[0])
{
case 'list':
// [1] - delimiter
// [2] - array of values
return implode($value[1], array_map([$this, 'compileValue'], $value[2]));
case 'raw_color':
if (!empty($this->formatter->compressColors))
{
return $this->compileValue($this->coerceColor($value));
}
return $value[1];
case 'keyword':
// [1] - the keyword
return $value[1];
case 'number':
list(, $num, $unit) = $value;
// [1] - the number
// [2] - the unit
if ($this->numberPrecision !== null)
{
$num = round($num, $this->numberPrecision);
}
return $num . $unit;
case 'string':
// [1] - contents of string (includes quotes)
list(, $delim, $content) = $value;
foreach ($content as &$part)
{
if (is_array($part))
{
$part = $this->compileValue($part);
}
}
return $delim . implode($content) . $delim;
case 'color':
// [1] - red component (either number or a %)
// [2] - green component
// [3] - blue component
// [4] - optional alpha component
list(, $r, $g, $b) = $value;
$r = round($r);
$g = round($g);
$b = round($b);
if (count($value) == 5 && $value[4] != 1)
{
// rgba
return 'rgba(' . $r . ',' . $g . ',' . $b . ',' . $value[4] . ')';
}
$h = sprintf("#%02x%02x%02x", $r, $g, $b);
if (!empty($this->formatter->compressColors))
{
// Converting hex color to short notation (e.g. #003399 to #039)
if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6])
{
$h = '#' . $h[1] . $h[3] . $h[5];
}
}
return $h;
case 'function':
list(, $name, $args) = $value;
return $name . '(' . $this->compileValue($args) . ')';
default: // assumed to be unit
$this->throwError("unknown value type: $value[0]");
}
}
/**
* @param $args
*
* @return float|int
* @since LESSC
* @throws \Exception
*/
protected function lib_pow($args)
{
list($base, $exp) = $this->assertArgs($args, 2, "pow");
return pow($this->assertNumber($base), $this->assertNumber($exp));
}
/**
* @return float
* @since LESSC
*/
protected function lib_pi()
{
return pi();
}
/**
* @param $args
*
* @return int
* @since LESSC
* @throws \Exception
*/
protected function lib_mod($args)
{
list($a, $b) = $this->assertArgs($args, 2, "mod");
return $this->assertNumber($a) % $this->assertNumber($b);
}
/**
* @param $num
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_tan($num)
{
return tan($this->assertNumber($num));
}
/**
* @param $num
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_sin($num)
{
return sin($this->assertNumber($num));
}
/**
* @param $num
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_cos($num)
{
return cos($this->assertNumber($num));
}
/**
* @param $num
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_atan($num)
{
$num = atan($this->assertNumber($num));
return ["number", $num, "rad"];
}
/**
* @param $num
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_asin($num)
{
$num = asin($this->assertNumber($num));
return ["number", $num, "rad"];
}
/**
* @param $num
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_acos($num)
{
$num = acos($this->assertNumber($num));
return ["number", $num, "rad"];
}
/**
* @param $num
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_sqrt($num)
{
return sqrt($this->assertNumber($num));
}
/**
* @param $value
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function lib_extract($value)
{
list($list, $idx) = $this->assertArgs($value, 2, "extract");
$idx = $this->assertNumber($idx);
// 1 indexed
if ($list[0] == "list" && isset($list[2][$idx - 1]))
{
return $list[2][$idx - 1];
}
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_isnumber($value)
{
return $this->toBool($value[0] == "number");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_isstring($value)
{
return $this->toBool($value[0] == "string");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_iscolor($value)
{
return $this->toBool($this->coerceColor($value));
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_iskeyword($value)
{
return $this->toBool($value[0] == "keyword");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_ispixel($value)
{
return $this->toBool($value[0] == "number" && $value[2] == "px");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_ispercentage($value)
{
return $this->toBool($value[0] == "number" && $value[2] == "%");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_isem($value)
{
return $this->toBool($value[0] == "number" && $value[2] == "em");
}
/**
* @param $value
*
* @return array
* @since LESSC
*/
protected function lib_isrem($value)
{
return $this->toBool($value[0] == "number" && $value[2] == "rem");
}
/**
* @param $color
*
* @return string
* @since LESSC
* @throws \Exception
*/
protected function lib_rgbahex($color)
{
$color = $this->coerceColor($color);
if (is_null($color))
{
$this->throwError("color expected for rgbahex");
}
return sprintf("#%02x%02x%02x%02x",
isset($color[4]) ? $color[4] * 255 : 255,
$color[1], $color[2], $color[3]);
}
/**
* @param $color
*
* @return string
* @since LESSC
* @throws \Exception
*/
protected function lib_argb($color)
{
return $this->lib_rgbahex($color);
}
// utility func to unquote a string
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_e($arg)
{
switch ($arg[0])
{
case "list":
$items = $arg[2];
if (isset($items[0]))
{
return $this->lib_e($items[0]);
}
return self::$defaultValue;
case "string":
$arg[1] = "";
return $arg;
case "keyword":
return $arg;
default:
return ["keyword", $this->compileValue($arg)];
}
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib__sprintf($args)
{
if ($args[0] != "list")
{
return $args;
}
$values = $args[2];
$string = array_shift($values);
$template = $this->compileValue($this->lib_e($string));
$i = 0;
if (preg_match_all('/%[dsa]/', $template, $m))
{
foreach ($m[0] as $match)
{
$val = isset($values[$i]) ?
$this->reduce($values[$i]) : ['keyword', ''];
// lessjs compat, renders fully expanded color, not raw color
if ($color = $this->coerceColor($val))
{
$val = $color;
}
$i++;
$rep = $this->compileValue($this->lib_e($val));
$template = preg_replace('/' . self::preg_quote($match) . '/',
$rep, $template, 1);
}
}
$d = $string[0] == "string" ? $string[1] : '"';
return ["string", $d, [$template]];
}
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_floor($arg)
{
$value = $this->assertNumber($arg);
return ["number", floor($value), $arg[2]];
}
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_ceil($arg)
{
$value = $this->assertNumber($arg);
return ["number", ceil($value), $arg[2]];
}
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_round($arg)
{
$value = $this->assertNumber($arg);
return ["number", round($value), $arg[2]];
}
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_unit($arg)
{
if ($arg[0] == "list")
{
list($number, $newUnit) = $arg[2];
return ["number", $this->assertNumber($number),
$this->compileValue($this->lib_e($newUnit))];
}
else
{
return ["number", $this->assertNumber($arg), ""];
}
}
/**
* Helper function to get arguments for color manipulation functions.
* takes a list that contains a color like thing and a percentage
*
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function colorArgs($args)
{
if ($args[0] != 'list' || count($args[2]) < 2)
{
return [['color', 0, 0, 0], 0];
}
list($color, $delta) = $args[2];
$color = $this->assertColor($color);
$delta = floatval($delta[1]);
return [$color, $delta];
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_darken($args)
{
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[3] = $this->clamp($hsl[3] - $delta, 100);
return $this->toRGB($hsl);
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_lighten($args)
{
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[3] = $this->clamp($hsl[3] + $delta, 100);
return $this->toRGB($hsl);
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_saturate($args)
{
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[2] = $this->clamp($hsl[2] + $delta, 100);
return $this->toRGB($hsl);
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_desaturate($args)
{
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[2] = $this->clamp($hsl[2] - $delta, 100);
return $this->toRGB($hsl);
}
/**
* @param $args
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_spin($args)
{
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[1] = $hsl[1] + $delta % 360;
if ($hsl[1] < 0) $hsl[1] += 360;
return $this->toRGB($hsl);
}
/**
* @param $args
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function lib_fadeout($args)
{
list($color, $delta) = $this->colorArgs($args);
$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta / 100);
return $color;
}
/**
* @param $args
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function lib_fadein($args)
{
list($color, $delta) = $this->colorArgs($args);
$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta / 100);
return $color;
}
/**
* @param $color
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_hue($color)
{
$hsl = $this->toHSL($this->assertColor($color));
return round($hsl[1]);
}
/**
* @param $color
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_saturation($color)
{
$hsl = $this->toHSL($this->assertColor($color));
return round($hsl[2]);
}
/**
* @param $color
*
* @return float
* @since LESSC
* @throws \Exception
*/
protected function lib_lightness($color)
{
$hsl = $this->toHSL($this->assertColor($color));
return round($hsl[3]);
}
// get the alpha of a color
// defaults to 1 for non-colors or colors without an alpha
/**
* @param $value
*
* @return int|mixed
* @since LESSC
*/
protected function lib_alpha($value)
{
if ($color = $this->coerceColor($value) !== null)
{
return isset($color[4]) ? $color[4] : 1;
}
}
// set the alpha of the color
/**
* @param $args
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function lib_fade($args)
{
list($color, $alpha) = $this->colorArgs($args);
$color[4] = $this->clamp($alpha / 100.0);
return $color;
}
/**
* @param $arg
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function lib_percentage($arg)
{
$num = $this->assertNumber($arg);
return ["number", $num * 100, "%"];
}
// mixes two colors by weight
// mix(@color1, @color2, [@weight: 50%]);
// http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
/**
* @param $args
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function lib_mix($args)
{
if ($args[0] != "list" || count($args[2]) < 2)
{
$this->throwError("mix expects (color1, color2, weight)");
}
list($first, $second) = $args[2];
$first = $this->assertColor($first);
$second = $this->assertColor($second);
$first_a = $this->lib_alpha($first);
$second_a = $this->lib_alpha($second);
if (isset($args[2][2]))
{
$weight = $args[2][2][1] / 100.0;
}
else
{
$weight = 0.5;
}
$w = $weight * 2 - 1;
$a = $first_a - $second_a;
$w1 = (($w * $a == -1 ? $w : ($w + $a) / (1 + $w * $a)) + 1) / 2.0;
$w2 = 1.0 - $w1;
$new = ['color',
$w1 * $first[1] + $w2 * $second[1],
$w1 * $first[2] + $w2 * $second[2],
$w1 * $first[3] + $w2 * $second[3],
];
if ($first_a != 1.0 || $second_a != 1.0)
{
$new[] = $first_a * $weight + $second_a * ($weight - 1);
}
return $this->fixColor($new);
}
/**
* @param $args
*
* @return array|null
* @since LESSC
* @throws \Exception
*/
protected function lib_contrast($args)
{
if ($args[0] != 'list' || count($args[2]) < 3)
{
return [['color', 0, 0, 0], 0];
}
list($inputColor, $darkColor, $lightColor) = $args[2];
$inputColor = $this->assertColor($inputColor);
$darkColor = $this->assertColor($darkColor);
$lightColor = $this->assertColor($lightColor);
$hsl = $this->toHSL($inputColor);
if ($hsl[3] > 50)
{
return $darkColor;
}
return $lightColor;
}
/**
* @param $value
* @param string $error
*
* @return array|null
* @since LESSC
* @throws \Exception
*/
protected function assertColor($value, $error = "expected color value")
{
$color = $this->coerceColor($value);
if (is_null($color))
{
$this->throwError($error);
}
return $color;
}
/**
* @param $value
* @param string $error
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function assertNumber($value, $error = "expecting number")
{
if ($value[0] == "number")
{
return $value[1];
}
$this->throwError($error);
}
/**
* @param $value
* @param $expectedArgs
* @param string $name
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function assertArgs($value, $expectedArgs, $name = "")
{
if ($expectedArgs == 1)
{
return $value;
}
else
{
if ($value[0] !== "list" || $value[1] != ",")
{
$this->throwError("expecting list");
}
$values = $value[2];
$numValues = count($values);
if ($expectedArgs != $numValues)
{
if ($name)
{
$name = $name . ": ";
}
$this->throwError("${name}expecting $expectedArgs arguments, got $numValues");
}
return $values;
}
}
/**
* @param $color
*
* @return array
* @since LESSC
*/
protected function toHSL($color)
{
if ($color[0] == 'hsl')
{
return $color;
}
$r = $color[1] / 255;
$g = $color[2] / 255;
$b = $color[3] / 255;
$min = min($r, $g, $b);
$max = max($r, $g, $b);
$L = ($min + $max) / 2;
if ($min == $max)
{
$S = $H = 0;
}
else
{
if ($L < 0.5)
$S = ($max - $min) / ($max + $min);
else
$S = ($max - $min) / (2.0 - $max - $min);
if ($r == $max)
{
$H = ($g - $b) / ($max - $min);
}
elseif ($g == $max)
{
$H = 2.0 + ($b - $r) / ($max - $min);
}
elseif ($b == $max)
{
$H = 4.0 + ($r - $g) / ($max - $min);
}
}
$out = ['hsl',
($H < 0 ? $H + 6 : $H) * 60,
$S * 100,
$L * 100,
];
if (count($color) > 4)
{
$out[] = $color[4];
} // copy alpha
return $out;
}
/**
* @param $comp
* @param $temp1
* @param $temp2
*
* @return mixed
* @since LESSC
*/
protected function toRGB_helper($comp, $temp1, $temp2)
{
if ($comp < 0)
{
$comp += 1.0;
}
elseif ($comp > 1)
{
$comp -= 1.0;
}
if (6 * $comp < 1)
{
return $temp1 + ($temp2 - $temp1) * 6 * $comp;
}
if (2 * $comp < 1)
{
return $temp2;
}
if (3 * $comp < 2)
{
return $temp1 + ($temp2 - $temp1) * ((2 / 3) - $comp) * 6;
}
return $temp1;
}
/**
* Converts a hsl array into a color value in rgb.
* Expects H to be in range of 0 to 360, S and L in 0 to 100
*
* @param $color
*
* @return array
* @since LESSC
*/
protected function toRGB($color)
{
if ($color[0] == 'color')
{
return $color;
}
$H = $color[1] / 360;
$S = $color[2] / 100;
$L = $color[3] / 100;
if ($S == 0)
{
$r = $g = $b = $L;
}
else
{
$temp2 = $L < 0.5 ?
$L * (1.0 + $S) :
$L + $S - $L * $S;
$temp1 = 2.0 * $L - $temp2;
$r = $this->toRGB_helper($H + 1 / 3, $temp1, $temp2);
$g = $this->toRGB_helper($H, $temp1, $temp2);
$b = $this->toRGB_helper($H - 1 / 3, $temp1, $temp2);
}
// $out = array('color', round($r*255), round($g*255), round($b*255));
$out = ['color', $r * 255, $g * 255, $b * 255];
if (count($color) > 4)
{
$out[] = $color[4];
}
// copy alpha
return $out;
}
/**
* @param $v
* @param int $max
* @param int $min
*
* @return mixed
* @since LESSC
*/
protected function clamp($v, $max = 1, $min = 0)
{
return min($max, max($min, $v));
}
/**
* Convert the rgb, rgba, hsl color literals of function type
* as returned by the parser into values of color type.
*
* @param $func
*
* @return array|bool
* @since LESSC
* @throws \Exception
*/
protected function funcToColor($func)
{
$fname = $func[1];
if ($func[2][0] != 'list')
{
return false;
}
// need a list of arguments
$rawComponents = $func[2][2];
if ($fname == 'hsl' || $fname == 'hsla')
{
$hsl = ['hsl'];
$i = 0;
foreach ($rawComponents as $c)
{
$val = $this->reduce($c);
$val = isset($val[1]) ? floatval($val[1]) : 0;
if ($i == 0)
{
$clamp = 360;
}
elseif ($i < 3)
{
$clamp = 100;
}
else
{
$clamp = 1;
}
$hsl[] = $this->clamp($val, $clamp);
$i++;
}
while (count($hsl) < 4)
{
$hsl[] = 0;
}
return $this->toRGB($hsl);
}
elseif ($fname == 'rgb' || $fname == 'rgba')
{
$components = [];
$i = 1;
foreach ($rawComponents as $c)
{
$c = $this->reduce($c);
if ($i < 4)
{
if ($c[0] == "number" && $c[2] == "%")
{
$components[] = 255 * ($c[1] / 100);
}
else
{
$components[] = floatval($c[1]);
}
}
elseif ($i == 4)
{
if ($c[0] == "number" && $c[2] == "%")
{
$components[] = 1.0 * ($c[1] / 100);
}
else
{
$components[] = floatval($c[1]);
}
}
else break;
$i++;
}
while (count($components) < 3)
{
$components[] = 0;
}
array_unshift($components, 'color');
return $this->fixColor($components);
}
return false;
}
/**
* @param $value
* @param bool $forExpression
*
* @return array|bool|null
* @since LESSC
* @throws \Exception
*/
protected function reduce($value, $forExpression = false)
{
switch ($value[0])
{
case "interpolate":
$reduced = $this->reduce($value[1]);
$var = $this->compileValue($reduced);
$res = $this->reduce(["variable", $this->vPrefix . $var]);
if ($res[0] == "raw_color")
{
$res = $this->coerceColor($res);
}
if (empty($value[2]))
{
$res = $this->lib_e($res);
}
return $res;
case "variable":
$key = $value[1];
if (is_array($key))
{
$key = $this->reduce($key);
$key = $this->vPrefix . $this->compileValue($this->lib_e($key));
}
$seen =& $this->env->seenNames;
if (!empty($seen[$key]))
{
$this->throwError("infinite loop detected: $key");
}
$seen[$key] = true;
$out = $this->reduce($this->get($key, self::$defaultValue));
$seen[$key] = false;
return $out;
case "list":
foreach ($value[2] as &$item)
{
$item = $this->reduce($item, $forExpression);
}
return $value;
case "expression":
return $this->evaluate($value);
case "string":
foreach ($value[2] as &$part)
{
if (is_array($part))
{
$strip = $part[0] == "variable";
$part = $this->reduce($part);
if ($strip)
{
$part = $this->lib_e($part);
}
}
}
return $value;
case "escape":
list(, $inner) = $value;
return $this->lib_e($this->reduce($inner));
case "function":
$color = $this->funcToColor($value);
if ($color)
{
return $color;
}
list(, $name, $args) = $value;
if ($name == "%")
{
$name = "_sprintf";
}
$f = isset($this->libFunctions[$name]) ?
$this->libFunctions[$name] : [$this, 'lib_' . $name];
if (is_callable($f))
{
if ($args[0] == 'list')
{
$args = self::compressList($args[2], $args[1]);
}
$ret = call_user_func($f, $this->reduce($args, true), $this);
if (is_null($ret))
{
return ["string", "", [
$name, "(", $args, ")",
]];
}
// convert to a typed value if the result is a php primitive
if (is_numeric($ret))
{
$ret = ['number', $ret, ""];
}
elseif (!is_array($ret))
{
$ret = ['keyword', $ret];
}
return $ret;
}
// plain function, reduce args
$value[2] = $this->reduce($value[2]);
return $value;
case "unary":
list(, $op, $exp) = $value;
$exp = $this->reduce($exp);
if ($exp[0] == "number")
{
switch ($op)
{
case "+":
return $exp;
case "-":
$exp[1] *= -1;
return $exp;
}
}
return ["string", "", [$op, $exp]];
}
if ($forExpression)
{
switch ($value[0])
{
case "keyword":
if ($color = $this->coerceColor($value))
{
return $color;
}
break;
case "raw_color":
return $this->coerceColor($value);
}
}
return $value;
}
// coerce a value for use in color operation
/**
* @param $value
*
* @return array|null
* @since LESSC
*/
protected function coerceColor($value)
{
switch ($value[0])
{
case 'color':
return $value;
case 'raw_color':
$c = ["color", 0, 0, 0];
$colorStr = substr($value[1], 1);
$num = hexdec($colorStr);
$width = strlen($colorStr) == 3 ? 16 : 256;
for ($i = 3; $i > 0; $i--)
{
// 3 2 1
$t = $num % $width;
$num /= $width;
$c[$i] = $t * (256 / $width) + $t * floor(16 / $width);
}
return $c;
case 'keyword':
$name = $value[1];
if (isset(self::$cssColors[$name]))
{
$rgba = explode(',', self::$cssColors[$name]);
if (isset($rgba[3]))
{
return ['color', $rgba[0], $rgba[1], $rgba[2], $rgba[3]];
}
return ['color', $rgba[0], $rgba[1], $rgba[2]];
}
return;
}
}
// make something string like into a string
/**
* @param $value
*
* @return array|null
* @since LESSC
*/
protected function coerceString($value)
{
switch ($value[0])
{
case "string":
return $value;
case "keyword":
return ["string", "", [$value[1]]];
}
return;
}
// turn list of length 1 into value type
/**
* @param $value
*
* @return mixed
* @since LESSC
*/
protected function flattenList($value)
{
if ($value[0] == "list" && count($value[2]) == 1)
{
return $this->flattenList($value[2][0]);
}
return $value;
}
/**
* @param $a
*
* @return array
* @since LESSC
*/
protected function toBool($a)
{
if ($a)
{
return self::$TRUE;
}
else
{
return self::$FALSE;
}
}
// evaluate an expression
/**
* @param $exp
*
* @return array|string
* @since LESSC
* @throws \Exception
*/
protected function evaluate($exp)
{
list(, $op, $left, $right, $whiteBefore, $whiteAfter) = $exp;
$left = $this->reduce($left, true);
$right = $this->reduce($right, true);
if ($leftColor = $this->coerceColor($left))
{
$left = $leftColor;
}
if ($rightColor = $this->coerceColor($right))
{
$right = $rightColor;
}
$ltype = $left[0];
$rtype = $right[0];
// operators that work on all types
if ($op == "and")
{
return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
}
if ($op == "=")
{
return $this->toBool($this->eq($left, $right));
}
if ($op == "+" && ($str = $this->stringConcatenate($left, $right) !== null))
{
return $str;
}
// type based operators
$fname = "op_${ltype}_${rtype}";
if (is_callable([$this, $fname]))
{
$out = $this->$fname($op, $left, $right);
if ($out !== null)
{
return $out;
}
}
// make the expression look it did before being parsed
$paddedOp = $op;
if ($whiteBefore)
{
$paddedOp = " " . $paddedOp;
}
if ($whiteAfter)
{
$paddedOp .= " ";
}
return ["string", "", [$left, $paddedOp, $right]];
}
/**
* @param $left
* @param $right
*
* @return array|null
* @since LESSC
*/
protected function stringConcatenate($left, $right)
{
if ($strLeft = $this->coerceString($left))
{
if ($right[0] == "string")
{
$right[1] = "";
}
$strLeft[2][] = $right;
return $strLeft;
}
if ($strRight = $this->coerceString($right))
{
array_unshift($strRight[2], $left);
return $strRight;
}
}
// make sure a color's components don't go out of bounds
/**
* @param $c
*
* @return mixed
* @since LESSC
*/
protected function fixColor($c)
{
foreach (range(1, 3) as $i)
{
if ($c[$i] < 0)
{
$c[$i] = 0;
}
if ($c[$i] > 255)
{
$c[$i] = 255;
}
}
return $c;
}
/**
* @param $op
* @param $lft
* @param $rgt
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function op_number_color($op, $lft, $rgt)
{
if ($op == '+' || $op == '*')
{
return $this->op_color_number($op, $rgt, $lft);
}
}
/**
* @param $op
* @param $lft
* @param $rgt
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function op_color_number($op, $lft, $rgt)
{
if ($rgt[0] == '%')
{
$rgt[1] /= 100;
}
return $this->op_color_color($op, $lft,
array_fill(1, count($lft) - 1, $rgt[1]));
}
/**
* @param $op
* @param $left
* @param $right
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
protected function op_color_color($op, $left, $right)
{
$out = ['color'];
$max = count($left) > count($right) ? count($left) : count($right);
foreach (range(1, $max - 1) as $i)
{
$lval = isset($left[$i]) ? $left[$i] : 0;
$rval = isset($right[$i]) ? $right[$i] : 0;
switch ($op)
{
case '+':
$out[] = $lval + $rval;
break;
case '-':
$out[] = $lval - $rval;
break;
case '*':
$out[] = $lval * $rval;
break;
case '%':
$out[] = $lval % $rval;
break;
case '/':
if ($rval == 0) $this->throwError("evaluate error: can't divide by zero");
$out[] = $lval / $rval;
break;
default:
$this->throwError('evaluate error: color op number failed on op ' . $op);
}
}
return $this->fixColor($out);
}
/**
* @param $color
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
public function lib_red($color)
{
$color = $this->coerceColor($color);
if (is_null($color))
{
$this->throwError('color expected for red()');
}
return $color[1];
}
/**
* @param $color
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
public function lib_green($color)
{
$color = $this->coerceColor($color);
if (is_null($color))
{
$this->throwError('color expected for green()');
}
return $color[2];
}
/**
* @param $color
*
* @return mixed
* @since LESSC
* @throws \Exception
*/
public function lib_blue($color)
{
$color = $this->coerceColor($color);
if (is_null($color))
{
$this->throwError('color expected for blue()');
}
return $color[3];
}
// operator on two numbers
/**
* @param $op
* @param $left
* @param $right
*
* @return array
* @since LESSC
* @throws \Exception
*/
protected function op_number_number($op, $left, $right)
{
$unit = empty($left[2]) ? $right[2] : $left[2];
$value = 0;
switch ($op)
{
case '+':
$value = $left[1] + $right[1];
break;
case '*':
$value = $left[1] * $right[1];
break;
case '-':
$value = $left[1] - $right[1];
break;
case '%':
$value = $left[1] % $right[1];
break;
case '/':
if ($right[1] == 0) $this->throwError('parse error: divide by zero');
$value = $left[1] / $right[1];
break;
case '<':
return $this->toBool($left[1] < $right[1]);
case '>':
return $this->toBool($left[1] > $right[1]);
case '>=':
return $this->toBool($left[1] >= $right[1]);
case '=<':
return $this->toBool($left[1] <= $right[1]);
default:
$this->throwError('parse error: unknown number operator: ' . $op);
}
return ["number", $value, $unit];
}
/* environment functions */
/**
* @param $type
* @param null $selectors
*
* @return stdclass
* @since LESSC
*/
protected function makeOutputBlock($type, $selectors = null)
{
$b = new stdclass;
$b->lines = [];
$b->children = [];
$b->selectors = $selectors;
$b->type = $type;
$b->parent = $this->scope;
return $b;
}
// the state of execution
/**
* @param null $block
*
* @return stdclass
* @since LESSC
*/
protected function pushEnv($block = null)
{
$e = new stdclass;
$e->parent = $this->env;
$e->store = [];
$e->block = $block;
$this->env = $e;
return $e;
}
// pop something off the stack
/**
* @return mixed
* @since LESSC
*/
protected function popEnv()
{
$old = $this->env;
$this->env = $this->env->parent;
return $old;
}
// set something in the current env
/**
* @param $name
* @param $value
*
* @since LESSC
*/
protected function set($name, $value)
{
$this->env->store[$name] = $value;
}
// get the highest occurrence entry for a name
/**
* @param $name
* @param null $default
*
* @return array|null
* @since LESSC
*/
protected function get($name, $default = null)
{
$current = $this->env;
$isArguments = $name == $this->vPrefix . 'arguments';
while ($current)
{
if ($isArguments && isset($current->arguments))
{
return ['list', ' ', $current->arguments];
}
if (isset($current->store[$name]))
return $current->store[$name];
else
{
$current = isset($current->storeParent) ?
$current->storeParent : $current->parent;
}
}
return $default;
}
// inject array of unparsed strings into environment as variables
/**
* @param $args
*
* @since LESSC
* @throws \Exception
*/
protected function injectVariables($args)
{
$this->pushEnv();
$parser = new lessc_parser($this, __METHOD__);
foreach ($args as $name => $strValue)
{
if ($name[0] != '@')
{
$name = '@' . $name;
}
$parser->count = 0;
$parser->buffer = (string) $strValue;
if (!$parser->propertyValue($value))
{
throw new Exception("failed to parse passed in variable $name: $strValue");
}
$this->set($name, $value);
}
}
/**
* Initialize any static state, can initialize parser for a file
* $opts isn't used yet
*
* @param null $fname
*
* @since LESSC
*/
public function __construct($fname = null)
{
if ($fname !== null)
{
// used for deprecated parse method
$this->_parseFile = $fname;
}
}
/**
* @param $string
* @param null $name
*
* @return string
* @since LESSC
* @throws \Exception
*/
public function compile($string, $name = null)
{
$locale = setlocale(LC_NUMERIC, 0);
setlocale(LC_NUMERIC, "C");
$this->parser = $this->makeParser($name);
$root = $this->parser->parse($string);
$this->env = null;
$this->scope = null;
$this->formatter = $this->newFormatter();
if (!empty($this->registeredVars))
{
$this->injectVariables($this->registeredVars);
}
$this->sourceParser = $this->parser; // used for error messages
$this->compileBlock($root);
ob_start();
$this->formatter->block($this->scope);
$out = ob_get_clean();
setlocale(LC_NUMERIC, $locale);
return $out;
}
/**
* @param $fname
* @param null $outFname
*
* @return int|string
* @since LESSC
* @throws \Exception
*/
public function compileFile($fname, $outFname = null)
{
if (!is_readable($fname))
{
throw new Exception('load error: failed to find ' . $fname);
}
$pi = pathinfo($fname);
$oldImport = $this->importDir;
$this->importDir = (array) $this->importDir;
$this->importDir[] = $pi['dirname'] . '/';
$this->addParsedFile($fname);
$out = $this->compile(file_get_contents($fname), $fname);
$this->importDir = $oldImport;
if ($outFname !== null)
{
return file_put_contents($outFname, $out);
}
return $out;
}
// compile only if changed input has changed or output doesn't exist
/**
* @param $in
* @param $out
*
* @return bool
* @since LESSC
* @throws \Exception
*/
public function checkedCompile($in, $out)
{
if (!is_file($out) || filemtime($in) > filemtime($out))
{
$this->compileFile($in, $out);
return true;
}
return false;
}
/**
* Execute lessphp on a .less file or a lessphp cache structure
*
* The lessphp cache structure contains information about a specific
* less file having been parsed. It can be used as a hint for future
* calls to determine whether or not a rebuild is required.
*
* The cache structure contains two important keys that may be used
* externally:
*
* compiled: The final compiled CSS
* updated: The time (in seconds) the CSS was last compiled
*
* The cache structure is a plain-ol' PHP associative array and can
* be serialized and unserialized without a hitch.
*
* @param mixed $in Input
* @param bool $force Force rebuild?
*
* @return array lessphp cache structure
* @since LESSC
* @throws \Exception
*/
public function cachedCompile($in, $force = false)
{
// assume no root
$root = null;
if (is_string($in))
{
$root = $in;
}
elseif (is_array($in) and isset($in['root']))
{
if ($force or !isset($in['files']))
{
// If we are forcing a recompile or if for some reason the
// structure does not contain any file information we should
// specify the root to trigger a rebuild.
$root = $in['root'];
}
elseif (isset($in['files']) and is_array($in['files']))
{
foreach ($in['files'] as $fname => $ftime)
{
if (!is_file($fname) or filemtime($fname) > $ftime)
{
// One of the files we knew about previously has changed
// so we should look at our incoming root again.
$root = $in['root'];
break;
}
}
}
}
else
{
// TODO: Throw an exception? We got neither a string nor something
// that looks like a compatible lessphp cache structure.
return;
}
if ($root !== null)
{
// If we have a root value which means we should rebuild.
$out = [];
$out['root'] = $root;
$out['compiled'] = $this->compileFile($root);
$out['files'] = $this->allParsedFiles();
$out['updated'] = time();
return $out;
}
else
{
// No changes, pass back the structure
// we were given initially.
return $in;
}
}
// parse and compile buffer
// This is deprecated
/**
* @param null $str
* @param null $initialVariables
*
* @return int|string
* @since LESSC
* @throws \Exception
*/
public function parse($str = null, $initialVariables = null)
{
if (is_array($str))
{
$initialVariables = $str;
$str = null;
}
$oldVars = $this->registeredVars;
if ($initialVariables !== null)
{
$this->setVariables($initialVariables);
}
if ($str == null)
{
if (empty($this->_parseFile))
{
throw new exception("nothing to parse");
}
$out = $this->compileFile($this->_parseFile);
}
else
{
$out = $this->compile($str);
}
$this->registeredVars = $oldVars;
return $out;
}
/**
* @param $name
*
* @return lessc_parser
* @since LESSC
*/
protected function makeParser($name)
{
$parser = new lessc_parser($this, $name);
$parser->writeComments = $this->preserveComments;
return $parser;
}
/**
* @param $name
*
* @since LESSC
*/
public function setFormatter($name)
{
$this->formatterName = $name;
}
/**
* @return mixed
* @since LESSC
*/
protected function newFormatter()
{
$className = "lessc_formatter_lessjs";
if (!empty($this->formatterName))
{
if (!is_string($this->formatterName))
return $this->formatterName;
$className = "lessc_formatter_$this->formatterName";
}
return new $className;
}
/**
* @param $preserve
*
* @since LESSC
*/
public function setPreserveComments($preserve)
{
$this->preserveComments = $preserve;
}
/**
* @param $name
* @param $func
*
* @since LESSC
*/
public function registerFunction($name, $func)
{
$this->libFunctions[$name] = $func;
}
/**
* @param $name
*
* @since LESSC
*/
public function unregisterFunction($name)
{
unset($this->libFunctions[$name]);
}
/**
* @param $variables
*
* @since LESSC
*/
public function setVariables($variables)
{
$this->registeredVars = array_merge($this->registeredVars, $variables);
}
/**
* @param $name
*
* @since LESSC
*/
public function unsetVariable($name)
{
unset($this->registeredVars[$name]);
}
/**
* @param $dirs
*
* @since LESSC
*/
public function setImportDir($dirs)
{
$this->importDir = (array) $dirs;
}
/**
* @param $dir
*
* @since LESSC
*/
public function addImportDir($dir)
{
$this->importDir = (array) $this->importDir;
$this->importDir[] = $dir;
}
/**
* @return array
* @since LESSC
*/
public function allParsedFiles()
{
return $this->allParsedFiles;
}
/**
* @param $file
*
* @since LESSC
*/
protected function addParsedFile($file)
{
$this->allParsedFiles[realpath($file)] = filemtime($file);
}
/**
* Uses the current value of $this->count to show line and line number
*
* @param null $msg
*
* @since LESSC
* @throws \Exception
*/
protected function throwError($msg = null)
{
if ($this->sourceLoc >= 0)
{
$this->sourceParser->throwError($msg, $this->sourceLoc);
}
throw new exception($msg);
}
// compile file $in to file $out if $in is newer than $out
// returns true when it compiles, false otherwise
/**
* @param $in
* @param $out
* @param null $less
*
* @return bool
* @since LESSC
* @throws \Exception
*/
public static function ccompile($in, $out, $less = null)
{
if ($less === null)
{
$less = new self;
}
return $less->checkedCompile($in, $out);
}
/**
* @param $in
* @param bool $force
* @param null $less
*
* @return array
* @since LESSC
* @throws \Exception
*/
public static function cexecute($in, $force = false, $less = null)
{
if ($less === null)
{
$less = new self;
}
return $less->cachedCompile($in, $force);
}
/**
* @var array
* @since LESSC
*/
protected static $cssColors = [
'aliceblue' => '240,248,255',
'antiquewhite' => '250,235,215',
'aqua' => '0,255,255',
'aquamarine' => '127,255,212',
'azure' => '240,255,255',
'beige' => '245,245,220',
'bisque' => '255,228,196',
'black' => '0,0,0',
'blanchedalmond' => '255,235,205',
'blue' => '0,0,255',
'blueviolet' => '138,43,226',
'brown' => '165,42,42',
'burlywood' => '222,184,135',
'cadetblue' => '95,158,160',
'chartreuse' => '127,255,0',
'chocolate' => '210,105,30',
'coral' => '255,127,80',
'cornflowerblue' => '100,149,237',
'cornsilk' => '255,248,220',
'crimson' => '220,20,60',
'cyan' => '0,255,255',
'darkblue' => '0,0,139',
'darkcyan' => '0,139,139',
'darkgoldenrod' => '184,134,11',
'darkgray' => '169,169,169',
'darkgreen' => '0,100,0',
'darkgrey' => '169,169,169',
'darkkhaki' => '189,183,107',
'darkmagenta' => '139,0,139',
'darkolivegreen' => '85,107,47',
'darkorange' => '255,140,0',
'darkorchid' => '153,50,204',
'darkred' => '139,0,0',
'darksalmon' => '233,150,122',
'darkseagreen' => '143,188,143',
'darkslateblue' => '72,61,139',
'darkslategray' => '47,79,79',
'darkslategrey' => '47,79,79',
'darkturquoise' => '0,206,209',
'darkviolet' => '148,0,211',
'deeppink' => '255,20,147',
'deepskyblue' => '0,191,255',
'dimgray' => '105,105,105',
'dimgrey' => '105,105,105',
'dodgerblue' => '30,144,255',
'firebrick' => '178,34,34',
'floralwhite' => '255,250,240',
'forestgreen' => '34,139,34',
'fuchsia' => '255,0,255',
'gainsboro' => '220,220,220',
'ghostwhite' => '248,248,255',
'gold' => '255,215,0',
'goldenrod' => '218,165,32',
'gray' => '128,128,128',
'green' => '0,128,0',
'greenyellow' => '173,255,47',
'grey' => '128,128,128',
'honeydew' => '240,255,240',
'hotpink' => '255,105,180',
'indianred' => '205,92,92',
'indigo' => '75,0,130',
'ivory' => '255,255,240',
'khaki' => '240,230,140',
'lavender' => '230,230,250',
'lavenderblush' => '255,240,245',
'lawngreen' => '124,252,0',
'lemonchiffon' => '255,250,205',
'lightblue' => '173,216,230',
'lightcoral' => '240,128,128',
'lightcyan' => '224,255,255',
'lightgoldenrodyellow' => '250,250,210',
'lightgray' => '211,211,211',
'lightgreen' => '144,238,144',
'lightgrey' => '211,211,211',
'lightpink' => '255,182,193',
'lightsalmon' => '255,160,122',
'lightseagreen' => '32,178,170',
'lightskyblue' => '135,206,250',
'lightslategray' => '119,136,153',
'lightslategrey' => '119,136,153',
'lightsteelblue' => '176,196,222',
'lightyellow' => '255,255,224',
'lime' => '0,255,0',
'limegreen' => '50,205,50',
'linen' => '250,240,230',
'magenta' => '255,0,255',
'maroon' => '128,0,0',
'mediumaquamarine' => '102,205,170',
'mediumblue' => '0,0,205',
'mediumorchid' => '186,85,211',
'mediumpurple' => '147,112,219',
'mediumseagreen' => '60,179,113',
'mediumslateblue' => '123,104,238',
'mediumspringgreen' => '0,250,154',
'mediumturquoise' => '72,209,204',
'mediumvioletred' => '199,21,133',
'midnightblue' => '25,25,112',
'mintcream' => '245,255,250',
'mistyrose' => '255,228,225',
'moccasin' => '255,228,181',
'navajowhite' => '255,222,173',
'navy' => '0,0,128',
'oldlace' => '253,245,230',
'olive' => '128,128,0',
'olivedrab' => '107,142,35',
'orange' => '255,165,0',
'orangered' => '255,69,0',
'orchid' => '218,112,214',
'palegoldenrod' => '238,232,170',
'palegreen' => '152,251,152',
'paleturquoise' => '175,238,238',
'palevioletred' => '219,112,147',
'papayawhip' => '255,239,213',
'peachpuff' => '255,218,185',
'peru' => '205,133,63',
'pink' => '255,192,203',
'plum' => '221,160,221',
'powderblue' => '176,224,230',
'purple' => '128,0,128',
'red' => '255,0,0',
'rosybrown' => '188,143,143',
'royalblue' => '65,105,225',
'saddlebrown' => '139,69,19',
'salmon' => '250,128,114',
'sandybrown' => '244,164,96',
'seagreen' => '46,139,87',
'seashell' => '255,245,238',
'sienna' => '160,82,45',
'silver' => '192,192,192',
'skyblue' => '135,206,235',
'slateblue' => '106,90,205',
'slategray' => '112,128,144',
'slategrey' => '112,128,144',
'snow' => '255,250,250',
'springgreen' => '0,255,127',
'steelblue' => '70,130,180',
'tan' => '210,180,140',
'teal' => '0,128,128',
'thistle' => '216,191,216',
'tomato' => '255,99,71',
'transparent' => '0,0,0,0',
'turquoise' => '64,224,208',
'violet' => '238,130,238',
'wheat' => '245,222,179',
'white' => '255,255,255',
'whitesmoke' => '245,245,245',
'yellow' => '255,255,0',
'yellowgreen' => '154,205,50',
];
}
// responsible for taking a string of LESS code and converting it into a
// syntax tree
/**
* Class lessc_parser
*
* @since LESSC
*/
class lessc_parser
{
/**
* @var int
* @since LESSC
*/
protected static $nextBlockId = 0; // used to uniquely identify blocks
/**
* @var array
* @since LESSC
*/
protected static $precedence = [
'=<' => 0,
'>=' => 0,
'=' => 0,
'<' => 0,
'>' => 0,
'+' => 1,
'-' => 1,
'*' => 2,
'/' => 2,
'%' => 2,
];
/**
* @var string
* @since LESSC
*/
protected static $whitePattern;
/**
* @var string
* @since LESSC
*/
protected static $commentMulti;
/**
* @var string
* @since LESSC
*/
protected static $commentSingle = "//";
/**
* @var string
* @since LESSC
*/
protected static $commentMultiLeft = "/*";
/**
* @var string
* @since LESSC
*/
protected static $commentMultiRight = "*/";
// regex string to match any of the operators
/**
* @var string
* @since LESSC
*/
protected static $operatorString;
// these properties will supress division unless it's inside parenthases
/**
* @var array
* @since LESSC
*/
protected static $supressDivisionProps =
['/border-radius$/i', '/^font$/i'];
/**
* @var array
* @since LESSC
*/
protected $blockDirectives = ["font-face", "keyframes", "page", "-moz-document", "viewport", "-moz-viewport", "-o-viewport", "-ms-viewport"];
/**
* @var array
* @since LESSC
*/
protected $lineDirectives = ["charset"];
/**
* if we are in parens we can be more liberal with whitespace around
* operators because it must evaluate to a single value and thus is less
* ambiguous.
*
* Consider:
* property1: 10 -5; // is two numbers, 10 and -5
* property2: (10 -5); // should evaluate to 5
*
* @since LESSC
*/
protected $inParens = false;
// caches preg escaped literals
/**
* @var array
* @since LESSC
*/
protected static $literalCache = [];
/**
* lessc_parser constructor.
*
* @param $lessc
* @param null $sourceName
*
* @since LESSC
*/
public function __construct($lessc, $sourceName = null)
{
$this->eatWhiteDefault = true;
// reference to less needed for vPrefix, mPrefix, and parentSelector
$this->lessc = $lessc;
$this->sourceName = $sourceName; // name used for error messages
$this->writeComments = false;
if (!self::$operatorString)
{
self::$operatorString =
'(' . implode('|', array_map(['lessc', 'preg_quote'],
array_keys(self::$precedence))) . ')';
$commentSingle = lessc::preg_quote(self::$commentSingle);
$commentMultiLeft = lessc::preg_quote(self::$commentMultiLeft);
$commentMultiRight = lessc::preg_quote(self::$commentMultiRight);
self::$commentMulti = $commentMultiLeft . '.*?' . $commentMultiRight;
self::$whitePattern = '/' . $commentSingle . '[^\n]*\s*|(' . self::$commentMulti . ')\s*|\s+/Ais';
}
}
/**
* @param $buffer
*
* @return null
* @since LESSC
* @throws \Exception
*/
public function parse($buffer)
{
$this->count = 0;
$this->line = 1;
$this->env = null; // block stack
$this->buffer = $this->writeComments ? $buffer : $this->removeComments($buffer);
$this->pushSpecialBlock("root");
$this->eatWhiteDefault = true;
$this->seenComments = [];
// trim whitespace on head
// if (preg_match('/^\s+/', $this->buffer, $m)) {
// $this->line += substr_count($m[0], "\n");
// $this->buffer = ltrim($this->buffer);
// }
$this->whitespace();
// parse the entire file
$lastCount = $this->count;
while (false !== $this->parseChunk()) ;
if ($this->count != strlen($this->buffer))
$this->throwError();
// TODO report where the block was opened
if ($this->env->parent !== null)
throw new exception('parse error: unclosed block');
return $this->env;
}
/**
* Parse a single chunk off the head of the buffer and append it to the
* current parse environment.
* Returns false when the buffer is empty, or when there is an error.
*
* This function is called repeatedly until the entire document is
* parsed.
*
* This parser is most similar to a recursive descent parser. Single
* functions represent discrete grammatical rules for the language, and
* they are able to capture the text that represents those rules.
*
* Consider the function lessc::keyword(). (all parse functions are
* structured the same)
*
* The function takes a single reference argument. When calling the
* function it will attempt to match a keyword on the head of the buffer.
* If it is successful, it will place the keyword in the referenced
* argument, advance the position in the buffer, and return true. If it
* fails then it won't advance the buffer and it will return false.
*
* All of these parse functions are powered by lessc::match(), which behaves
* the same way, but takes a literal regular expression. Sometimes it is
* more convenient to use match instead of creating a new function.
*
* Because of the format of the functions, to parse an entire string of
* grammatical rules, you can chain them together using &&.
*
* But, if some of the rules in the chain succeed before one fails, then
* the buffer position will be left at an invalid state. In order to
* avoid this, lessc::seek() is used to remember and set buffer positions.
*
* Before parsing a chain, use $s = $this->seek() to remember the current
* position into $s. Then if a chain fails, use $this->seek($s) to
* go back where we started.
*
* @return bool
* @since LESSC
* @throws \Exception
*/
protected function parseChunk()
{
if (empty($this->buffer)) return false;
$s = $this->seek();
// setting a property
if ($this->keyword($key) && $this->assign() &&
$this->propertyValue($value, $key) && $this->end()
)
{
$this->append(['assign', $key, $value], $s);
return true;
}
else
{
$this->seek($s);
}
// look for special css blocks
if ($this->literal('@', false))
{
$this->count--;
// media
if ($this->literal('@media'))
{
if (($this->mediaQueryList($mediaQueries) || true)
&& $this->literal('{')
)
{
$media = $this->pushSpecialBlock("media");
$media->queries = is_null($mediaQueries) ? [] : $mediaQueries;
return true;
}
else
{
$this->seek($s);
return false;
}
}
if ($this->literal("@", false) && $this->keyword($dirName))
{
if ($this->isDirective($dirName, $this->blockDirectives))
{
if (($this->openString("{", $dirValue, null, [";"]) || true) &&
$this->literal("{")
)
{
$dir = $this->pushSpecialBlock("directive");
$dir->name = $dirName;
if (isset($dirValue)) $dir->value = $dirValue;
return true;
}
}
elseif ($this->isDirective($dirName, $this->lineDirectives))
{
if ($this->propertyValue($dirValue) && $this->end())
{
$this->append(["directive", $dirName, $dirValue]);
return true;
}
}
}
$this->seek($s);
}
// setting a variable
if ($this->variable($var) && $this->assign() &&
$this->propertyValue($value) && $this->end()
)
{
$this->append(['assign', $var, $value], $s);
return true;
}
else
{
$this->seek($s);
}
if ($this->import($importValue))
{
$this->append($importValue, $s);
return true;
}
// opening parametric mixin
if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) &&
($this->guards($guards) || true) &&
$this->literal('{')
)
{
$block = $this->pushBlock($this->fixTags([$tag]));
$block->args = $args;
$block->isVararg = $isVararg;
if (!empty($guards)) $block->guards = $guards;
return true;
}
else
{
$this->seek($s);
}
// opening a simple block
if ($this->tags($tags) && $this->literal('{'))
{
$tags = $this->fixTags($tags);
$this->pushBlock($tags);
return true;
}
else
{
$this->seek($s);
}
// closing a block
if ($this->literal('}', false))
{
try
{
$block = $this->pop();
}
catch (exception $e)
{
$this->seek($s);
$this->throwError($e->getMessage());
}
$hidden = false;
if (is_null($block->type))
{
$hidden = true;
if (!isset($block->args))
{
foreach ($block->tags as $tag)
{
if (!is_string($tag) || $tag[0] != $this->lessc->mPrefix)
{
$hidden = false;
break;
}
}
}
foreach ($block->tags as $tag)
{
if (is_string($tag))
{
$this->env->children[$tag][] = $block;
}
}
}
if (!$hidden)
{
$this->append(['block', $block], $s);
}
// this is done here so comments aren't bundled into he block that
// was just closed
$this->whitespace();
return true;
}
// mixin
if ($this->mixinTags($tags) &&
($this->argumentDef($argv, $isVararg) || true) &&
($this->keyword($suffix) || true) && $this->end()
)
{
$tags = $this->fixTags($tags);
$this->append(['mixin', $tags, $argv, $suffix], $s);
return true;
}
else
{
$this->seek($s);
}
// spare ;
if ($this->literal(';')) return true;
return false; // got nothing, throw error
}
/**
* @param $dirname
* @param $directives
*
* @return int
* @since LESSC
*/
protected function isDirective($dirname, $directives)
{
// TODO: cache pattern in parser
$pattern = implode("|",
array_map(["lessc", "preg_quote"], $directives));
$pattern = '/^(-[a-z-]+-)?(' . $pattern . ')$/i';
return preg_match($pattern, $dirname);
}
/**
* @param $tags
*
* @return mixed
* @since LESSC
*/
protected function fixTags($tags)
{
// move @ tags out of variable namespace
foreach ($tags as &$tag)
{
if ($tag[0] == $this->lessc->vPrefix)
$tag[0] = $this->lessc->mPrefix;
}
return $tags;
}
// a list of expressions
/**
* @param $exps
*
* @return bool
* @since LESSC
*/
protected function expressionList(&$exps)
{
$values = [];
while ($this->expression($exp))
{
$values[] = $exp;
}
if (count($values) == 0) return false;
$exps = lessc::compressList($values, ' ');
return true;
}
/**
* Attempt to consume an expression.
*
* @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
*
* @param $out
*
* @return bool
* @since LESSC
*/
protected function expression(&$out)
{
if ($this->value($lhs))
{
$out = $this->expHelper($lhs, 0);
// look for / shorthand
if (!empty($this->env->supressedDivision))
{
unset($this->env->supressedDivision);
$s = $this->seek();
if ($this->literal("/") && $this->value($rhs))
{
$out = ["list", "",
[$out, ["keyword", "/"], $rhs]];
}
else
{
$this->seek($s);
}
}
return true;
}
return false;
}
/**
* recursively parse infix equation with $lhs at precedence $minP
*
* @param $lhs
* @param $minP
*
* @return array
* @since LESSC
*/
protected function expHelper($lhs, $minP)
{
$this->inExp = true;
$ss = $this->seek();
while (true)
{
$whiteBefore = isset($this->buffer[$this->count - 1]) &&
ctype_space($this->buffer[$this->count - 1]);
// If there is whitespace before the operator, then we require
// whitespace after the operator for it to be an expression
$needWhite = $whiteBefore && !$this->inParens;
if ($this->match(self::$operatorString . ($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP)
{
if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/" && empty($this->env->supressedDivision))
{
foreach (self::$supressDivisionProps as $pattern)
{
if (preg_match($pattern, $this->env->currentProperty))
{
$this->env->supressedDivision = true;
break 2;
}
}
}
$whiteAfter = isset($this->buffer[$this->count - 1]) &&
ctype_space($this->buffer[$this->count - 1]);
if (!$this->value($rhs)) break;
// peek for next operator to see what to do with rhs
if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]])
{
$rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
}
$lhs = ['expression', $m[1], $lhs, $rhs, $whiteBefore, $whiteAfter];
$ss = $this->seek();
continue;
}
break;
}
$this->seek($ss);
return $lhs;
}
// consume a list of values for a property
/**
* @param $value
* @param null $keyName
*
* @return bool
* @since LESSC
*/
public function propertyValue(&$value, $keyName = null)
{
$values = [];
if ($keyName !== null) $this->env->currentProperty = $keyName;
$s = null;
while ($this->expressionList($v))
{
$values[] = $v;
$s = $this->seek();
if (!$this->literal(',')) break;
}
if ($s) $this->seek($s);
if ($keyName !== null) unset($this->env->currentProperty);
if (count($values) == 0) return false;
$value = lessc::compressList($values, ', ');
return true;
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function parenValue(&$out)
{
$s = $this->seek();
// speed shortcut
if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(")
{
return false;
}
$inParens = $this->inParens;
if ($this->literal("(") &&
($this->inParens = true) && $this->expression($exp) &&
$this->literal(")")
)
{
$out = $exp;
$this->inParens = $inParens;
return true;
}
else
{
$this->inParens = $inParens;
$this->seek($s);
}
return false;
}
// a single value
/**
* @param $value
*
* @return bool
* @since LESSC
*/
protected function value(&$value)
{
$s = $this->seek();
// speed shortcut
if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "-")
{
// negation
if ($this->literal("-", false) &&
(($this->variable($inner) && $inner = ["variable", $inner]) ||
$this->unit($inner) ||
$this->parenValue($inner))
)
{
$value = ["unary", "-", $inner];
return true;
}
else
{
$this->seek($s);
}
}
if ($this->parenValue($value)) return true;
if ($this->unit($value)) return true;
if ($this->color($value)) return true;
if ($this->func($value)) return true;
if ($this->string($value)) return true;
if ($this->keyword($word))
{
$value = ['keyword', $word];
return true;
}
// try a variable
if ($this->variable($var))
{
$value = ['variable', $var];
return true;
}
// unquote string (should this work on any type?
if ($this->literal("~") && $this->string($str))
{
$value = ["escape", $str];
return true;
}
else
{
$this->seek($s);
}
// css hack: \0
if ($this->literal('\\') && $this->match('([0-9]+)', $m))
{
$value = ['keyword', '\\' . $m[1]];
return true;
}
else
{
$this->seek($s);
}
return false;
}
// an import statement
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function import(&$out)
{
$s = $this->seek();
if (!$this->literal('@import')) return false;
// @import "something.css" media;
// @import url("something.css") media;
// @import url(something.css) media;
if ($this->propertyValue($value))
{
$out = ["import", $value];
return true;
}
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function mediaQueryList(&$out)
{
if ($this->genericList($list, "mediaQuery", ",", false))
{
$out = $list[2];
return true;
}
return false;
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function mediaQuery(&$out)
{
$s = $this->seek();
$expressions = null;
$parts = [];
if (($this->literal("only") && ($only = true) || $this->literal("not") && ($not = true) || true) && $this->keyword($mediaType))
{
$prop = ["mediaType"];
if (isset($only)) $prop[] = "only";
if (isset($not)) $prop[] = "not";
$prop[] = $mediaType;
$parts[] = $prop;
}
else
{
$this->seek($s);
}
if (!empty($mediaType) && !$this->literal("and"))
{
// ~
}
else
{
$this->genericList($expressions, "mediaExpression", "and", false);
if (is_array($expressions)) $parts = array_merge($parts, $expressions[2]);
}
if (count($parts) == 0)
{
$this->seek($s);
return false;
}
$out = $parts;
return true;
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function mediaExpression(&$out)
{
$s = $this->seek();
$value = null;
if ($this->literal("(") &&
$this->keyword($feature) &&
($this->literal(":") && $this->expression($value) || true) &&
$this->literal(")")
)
{
$out = ["mediaExp", $feature];
if ($value) $out[] = $value;
return true;
}
elseif ($this->variable($variable))
{
$out = ['variable', $variable];
return true;
}
$this->seek($s);
return false;
}
// an unbounded string stopped by $end
/**
* @param $end
* @param $out
* @param null $nestingOpen
* @param null $rejectStrs
*
* @return bool
* @since LESSC
*/
protected function openString($end, &$out, $nestingOpen = null, $rejectStrs = null)
{
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
$stop = ["'", '"', "@{", $end];
$stop = array_map(["lessc", "preg_quote"], $stop);
// $stop[] = self::$commentMulti;
if ($rejectStrs !== null)
{
$stop = array_merge($stop, $rejectStrs);
}
$patt = '(.*?)(' . implode("|", $stop) . ')';
$nestingLevel = 0;
$content = [];
while ($this->match($patt, $m, false))
{
if (!empty($m[1]))
{
$content[] = $m[1];
if ($nestingOpen)
{
$nestingLevel += substr_count($m[1], $nestingOpen);
}
}
$tok = $m[2];
$this->count -= strlen($tok);
if ($tok == $end)
{
if ($nestingLevel == 0)
{
break;
}
else
{
$nestingLevel--;
}
}
if (($tok == "'" || $tok == '"') && $this->string($str))
{
$content[] = $str;
continue;
}
if ($tok == "@{" && $this->interpolation($inter))
{
$content[] = $inter;
continue;
}
if (!empty($rejectStrs) && in_array($tok, $rejectStrs))
{
break;
}
$content[] = $tok;
$this->count += strlen($tok);
}
$this->eatWhiteDefault = $oldWhite;
if (count($content) == 0) return false;
// trim the end
if (is_string(end($content)))
{
$content[count($content) - 1] = rtrim(end($content));
}
$out = ["string", "", $content];
return true;
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function string(&$out)
{
$s = $this->seek();
if ($this->literal('"', false))
{
$delim = '"';
}
elseif ($this->literal("'", false))
{
$delim = "'";
}
else
{
return false;
}
$content = [];
// look for either ending delim , escape, or string interpolation
$patt = '([^\n]*?)(@\{|\\\\|' .
lessc::preg_quote($delim) . ')';
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
while ($this->match($patt, $m, false))
{
$content[] = $m[1];
if ($m[2] == "@{")
{
$this->count -= strlen($m[2]);
if ($this->interpolation($inter))
{
$content[] = $inter;
}
else
{
$this->count += strlen($m[2]);
$content[] = "@{"; // ignore it
}
}
elseif ($m[2] == '\\')
{
$content[] = $m[2];
if ($this->literal($delim, false))
{
$content[] = $delim;
}
}
else
{
$this->count -= strlen($delim);
break; // delim
}
}
$this->eatWhiteDefault = $oldWhite;
if ($this->literal($delim))
{
$out = ["string", $delim, $content];
return true;
}
$this->seek($s);
return false;
}
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function interpolation(&$out)
{
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = true;
$s = $this->seek();
if ($this->literal("@{") &&
$this->openString("}", $interp, null, ["'", '"', ";"]) &&
$this->literal("}", false)
)
{
$out = ["interpolate", $interp];
$this->eatWhiteDefault = $oldWhite;
if ($this->eatWhiteDefault) $this->whitespace();
return true;
}
$this->eatWhiteDefault = $oldWhite;
$this->seek($s);
return false;
}
/**
* @param $unit
*
* @return bool
* @since LESSC
*/
protected function unit(&$unit)
{
// speed shortcut
if (isset($this->buffer[$this->count]))
{
$char = $this->buffer[$this->count];
if (!ctype_digit($char) && $char != ".") return false;
}
if ($this->match('([0-9]+(?:\.[0-9]*)?|\.[0-9]+)([%a-zA-Z]+)?', $m))
{
$unit = ["number", $m[1], empty($m[2]) ? "" : $m[2]];
return true;
}
return false;
}
// a # color
/**
* @param $out
*
* @return bool
* @since LESSC
*/
protected function color(&$out)
{
if ($this->match('(#(?:[0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{3}))', $m))
{
if (strlen($m[1]) > 7)
{
$out = ["string", "", [$m[1]]];
}
else
{
$out = ["raw_color", $m[1]];
}
return true;
}
return false;
}
// consume an argument definition list surrounded by ()
// each argument is a variable name with optional value
// or at the end a ... or a variable named followed by ...
// arguments are separated by , unless a ; is in the list, then ; is the
// delimiter.
/**
* @param $args
* @param $isVararg
*
* @return bool
* @since LESSC
* @throws \Exception
*/
protected function argumentDef(&$args, &$isVararg)
{
$s = $this->seek();
if (!$this->literal('(')) return false;
$values = [];
$delim = ",";
$method = "expressionList";
$isVararg = false;
while (true)
{
if ($this->literal("..."))
{
$isVararg = true;
break;
}
if ($this->$method($value))
{
if ($value[0] == "variable")
{
$arg = ["arg", $value[1]];
$ss = $this->seek();
if ($this->assign() && $this->$method($rhs))
{
$arg[] = $rhs;
}
else
{
$this->seek($ss);
if ($this->literal("..."))
{
$arg[0] = "rest";
$isVararg = true;
}
}
$values[] = $arg;
if ($isVararg) break;
continue;
}
else
{
$values[] = ["lit", $value];
}
}
if (!$this->literal($delim))
{
if ($delim == "," && $this->literal(";"))
{
// found new delim, convert existing args
$delim = ";";
$method = "propertyValue";
// transform arg list
if (isset($values[1]))
{ // 2 items
$newList = [];
foreach ($values as $i => $arg)
{
switch ($arg[0])
{
case "arg":
if ($i)
{
$this->throwError("Cannot mix ; and , as delimiter types");
}
$newList[] = $arg[2];
break;
case "lit":
$newList[] = $arg[1];
break;
case "rest":
$this->throwError("Unexpected rest before semicolon");
}
}
$newList = ["list", ", ", $newList];
switch ($values[0][0])
{
case "arg":
$newArg = ["arg", $values[0][1], $newList];
break;
case "lit":
$newArg = ["lit", $newList];
break;
}
}
elseif ($values)
{ // 1 item
$newArg = $values[0];
}
if ($newArg)
{
$values = [$newArg];
}
}
else
{
break;
}
}
}
if (!$this->literal(')'))
{
$this->seek($s);
return false;
}
$args = $values;
return true;
}
// consume a list of tags
// this accepts a hanging delimiter
/**
* @param $tags
* @param bool $simple
* @param string $delim
*
* @return bool
* @since LESSC
*/
protected function tags(&$tags, $simple = false, $delim = ',')
{
$tags = [];
while ($this->tag($tt, $simple))
{
$tags[] = $tt;
if (!$this->literal($delim)) break;
}
if (count($tags) == 0) return false;
return true;
}
// list of tags of specifying mixin path
// optionally separated by > (lazy, accepts extra >)
/**
* @param $tags
*
* @return bool
* @since LESSC
*/
protected function mixinTags(&$tags)
{
$s = $this->seek();
$tags = [];
while ($this->tag($tt, true))
{
$tags[] = $tt;
$this->literal(">");
}
if (count($tags) == 0) return false;
return true;
}
// a bracketed value (contained within in a tag definition)
/**
* @param $parts
* @param $hasExpression
*
* @return bool
* @since LESSC
*/
protected function tagBracket(&$parts, &$hasExpression)
{
// speed shortcut
if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "[")
{
return false;
}
$s = $this->seek();
$hasInterpolation = false;
if ($this->literal("[", false))
{
$attrParts = ["["];
// keyword, string, operator
while (true)
{
if ($this->literal("]", false))
{
$this->count--;
break; // get out early
}
if ($this->match('\s+', $m))
{
$attrParts[] = " ";
continue;
}
if ($this->string($str))
{
// escape parent selector, (yuck)
foreach ($str[2] as &$chunk)
{
$chunk = str_replace($this->lessc->parentSelector, "$&$", $chunk);
}
$attrParts[] = $str;
$hasInterpolation = true;
continue;
}
if ($this->keyword($word))
{
$attrParts[] = $word;
continue;
}
if ($this->interpolation($inter))
{
$attrParts[] = $inter;
$hasInterpolation = true;
continue;
}
// operator, handles attr namespace too
if ($this->match('[|-~\$\*\^=]+', $m))
{
$attrParts[] = $m[0];
continue;
}
break;
}
if ($this->literal("]", false))
{
$attrParts[] = "]";
foreach ($attrParts as $part)
{
$parts[] = $part;
}
$hasExpression = $hasExpression || $hasInterpolation;
return true;
}
$this->seek($s);
}
$this->seek($s);
return false;
}
// a space separated list of selectors
/**
* @param $tag
* @param bool $simple
*
* @return bool
* @since LESSC
*/
protected function tag(&$tag, $simple = false)
{
if ($simple)
$chars = '^@,:;{}\][>\(\) "\'';
else
$chars = '^@,;{}["\'';
$s = $this->seek();
$hasExpression = false;
$parts = [];
while ($this->tagBracket($parts, $hasExpression)) ;
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
while (true)
{
if ($this->match('([' . $chars . '0-9][' . $chars . ']*)', $m))
{
$parts[] = $m[1];
if ($simple) break;
while ($this->tagBracket($parts, $hasExpression)) ;
continue;
}
if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "@")
{
if ($this->interpolation($interp))
{
$hasExpression = true;
$interp[2] = true; // don't unescape
$parts[] = $interp;
continue;
}
if ($this->literal("@"))
{
$parts[] = "@";
continue;
}
}
if ($this->unit($unit))
{ // for keyframes
$parts[] = $unit[1];
$parts[] = $unit[2];
continue;
}
break;
}
$this->eatWhiteDefault = $oldWhite;
if (!$parts)
{
$this->seek($s);
return false;
}
if ($hasExpression)
{
$tag = ["exp", ["string", "", $parts]];
}
else
{
$tag = trim(implode($parts));
}
$this->whitespace();
return true;
}
// a css function
/**
* @param $func
*
* @return bool
* @since LESSC
*/
protected function func(&$func)
{
$s = $this->seek();
if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('('))
{
$fname = $m[1];
$sPreArgs = $this->seek();
$args = [];
while (true)
{
$ss = $this->seek();
// this ugly nonsense is for ie filter properties
if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value))
{
$args[] = ["string", "", [$name, "=", $value]];
}
else
{
$this->seek($ss);
if ($this->expressionList($value))
{
$args[] = $value;
}
}
if (!$this->literal(',')) break;
}
$args = ['list', ',', $args];
if ($this->literal(')'))
{
$func = ['function', $fname, $args];
return true;
}
elseif ($fname == 'url')
{
// couldn't parse and in url? treat as string
$this->seek($sPreArgs);
if ($this->openString(")", $string) && $this->literal(")"))
{
$func = ['function', $fname, $string];
return true;
}
}
}
$this->seek($s);
return false;
}
// consume a less variable
/**
* @param $name
*
* @return bool
* @since LESSC
*/
protected function variable(&$name)
{
$s = $this->seek();
if ($this->literal($this->lessc->vPrefix, false) &&
($this->variable($sub) || $this->keyword($name))
)
{
if (!empty($sub))
{
$name = ['variable', $sub];
}
else
{
$name = $this->lessc->vPrefix . $name;
}
return true;
}
$name = null;
$this->seek($s);
return false;
}
/**
* Consume an assignment operator
* Can optionally take a name that will be set to the current property name
*
* @param null $name
*
* @return bool
* @since LESSC
*/
protected function assign($name = null)
{
if ($name) $this->currentProperty = $name;
return $this->literal(':') || $this->literal('=');
}
// consume a keyword
/**
* @param $word
*
* @return bool
* @since LESSC
*/
protected function keyword(&$word)
{
if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m))
{
$word = $m[1];
return true;
}
return false;
}
// consume an end of statement delimiter
/**
* @return bool
* @since LESSC
*/
protected function end()
{
if ($this->literal(';'))
{
return true;
}
elseif ($this->count == strlen($this->buffer) || $this->buffer[$this->count] == '}')
{
// if there is end of file or a closing block next then we don't need a ;
return true;
}
return false;
}
/**
* @param $guards
*
* @return bool
* @since LESSC
*/
protected function guards(&$guards)
{
$s = $this->seek();
if (!$this->literal("when"))
{
$this->seek($s);
return false;
}
$guards = [];
while ($this->guardGroup($g))
{
$guards[] = $g;
if (!$this->literal(",")) break;
}
if (count($guards) == 0)
{
$guards = null;
$this->seek($s);
return false;
}
return true;
}
// a bunch of guards that are and'd together
// TODO rename to guardGroup
/**
* @param $guardGroup
*
* @return bool
* @since LESSC
*/
protected function guardGroup(&$guardGroup)
{
$s = $this->seek();
$guardGroup = [];
while ($this->guard($guard))
{
$guardGroup[] = $guard;
if (!$this->literal("and")) break;
}
if (count($guardGroup) == 0)
{
$guardGroup = null;
$this->seek($s);
return false;
}
return true;
}
/**
* @param $guard
*
* @return bool
* @since LESSC
*/
protected function guard(&$guard)
{
$s = $this->seek();
$negate = $this->literal("not");
if ($this->literal("(") && $this->expression($exp) && $this->literal(")"))
{
$guard = $exp;
if ($negate) $guard = ["negate", $guard];
return true;
}
$this->seek($s);
return false;
}
/* raw parsing functions */
/**
* @param $what
* @param null $eatWhitespace
*
* @return bool
* @since LESSC
*/
protected function literal($what, $eatWhitespace = null)
{
if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
// shortcut on single letter
if (!isset($what[1]) && isset($this->buffer[$this->count]))
{
if ($this->buffer[$this->count] == $what)
{
if (!$eatWhitespace)
{
$this->count++;
return true;
}
// goes below...
}
else
{
return false;
}
}
if (!isset(self::$literalCache[$what]))
{
self::$literalCache[$what] = lessc::preg_quote($what);
}
return $this->match(self::$literalCache[$what], $m, $eatWhitespace);
}
/**
* @param $out
* @param $parseItem
* @param string $delim
* @param bool $flatten
*
* @return bool
* @since LESSC
*/
protected function genericList(&$out, $parseItem, $delim = "", $flatten = true)
{
$s = $this->seek();
$items = [];
while ($this->$parseItem($value))
{
$items[] = $value;
if ($delim)
{
if (!$this->literal($delim)) break;
}
}
if (count($items) == 0)
{
$this->seek($s);
return false;
}
if ($flatten && count($items) == 1)
{
$out = $items[0];
}
else
{
$out = ["list", $delim, $items];
}
return true;
}
// advance counter to next occurrence of $what
// $until - don't include $what in advance
// $allowNewline, if string, will be used as valid char set
/**
* @param $what
* @param $out
* @param bool $until
* @param bool $allowNewline
*
* @return bool
* @since LESSC
*/
protected function to($what, &$out, $until = false, $allowNewline = false)
{
if (is_string($allowNewline))
{
$validChars = $allowNewline;
}
else
{
$validChars = $allowNewline ? "." : "[^\n]";
}
if (!$this->match('(' . $validChars . '*?)' . lessc::preg_quote($what), $m, !$until)) return false;
if ($until) $this->count -= strlen($what); // give back $what
$out = $m[1];
return true;
}
// try to match something on head of buffer
/**
* @param $regex
* @param $out
* @param null $eatWhitespace
*
* @return bool
* @since LESSC
*/
protected function match($regex, &$out, $eatWhitespace = null)
{
if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
$r = '/' . $regex . ($eatWhitespace && !$this->writeComments ? '\s*' : '') . '/Ais';
if (preg_match($r, $this->buffer, $out, null, $this->count))
{
$this->count += strlen($out[0]);
if ($eatWhitespace && $this->writeComments) $this->whitespace();
return true;
}
return false;
}
// match some whitespace
/**
* @return bool
* @since LESSC
*/
protected function whitespace()
{
if ($this->writeComments)
{
$gotWhite = false;
while (preg_match(self::$whitePattern, $this->buffer, $m, null, $this->count))
{
if (isset($m[1]) && empty($this->commentsSeen[$this->count]))
{
$this->append(["comment", $m[1]]);
$this->commentsSeen[$this->count] = true;
}
$this->count += strlen($m[0]);
$gotWhite = true;
}
return $gotWhite;
}
else
{
$this->match("", $m);
return strlen($m[0]) > 0;
}
}
// match something without consuming it
/**
* @param $regex
* @param null $out
* @param null $from
*
* @return int
* @since LESSC
*/
protected function peek($regex, &$out = null, $from = null)
{
if (is_null($from)) $from = $this->count;
$r = '/' . $regex . '/Ais';
$result = preg_match($r, $this->buffer, $out, null, $from);
return $result;
}
// seek to a spot in the buffer or return where we are on no argument
/**
* @param null $where
*
* @return bool
* @since LESSC
*/
protected function seek($where = null)
{
if ($where === null) return $this->count;
else $this->count = $where;
return true;
}
/* misc functions */
/**
* @param string $msg
* @param null $count
*
* @since LESSC
* @throws \Exception
*/
public function throwError($msg = "parse error", $count = null)
{
$count = is_null($count) ? $this->count : $count;
$line = $this->line +
substr_count(substr($this->buffer, 0, $count), "\n");
if (!empty($this->sourceName))
{
$loc = "$this->sourceName on line $line";
}
else
{
$loc = "line: $line";
}
// TODO this depends on $this->count
if ($this->peek("(.*?)(\n|$)", $m, $count))
{
throw new exception("$msg: failed at `$m[1]` $loc");
}
else
{
throw new exception("$msg: $loc");
}
}
/**
* @param null $selectors
* @param null $type
*
* @return stdclass
* @since LESSC
*/
protected function pushBlock($selectors = null, $type = null)
{
$b = new stdclass;
$b->parent = $this->env;
$b->type = $type;
$b->id = self::$nextBlockId++;
$b->isVararg = false; // TODO: kill me from here
$b->tags = $selectors;
$b->props = [];
$b->children = [];
$this->env = $b;
return $b;
}
// push a block that doesn't multiply tags
/**
* @param $type
*
* @return stdclass
* @since LESSC
*/
protected function pushSpecialBlock($type)
{
return $this->pushBlock(null, $type);
}
// append a property to the current block
/**
* @param $prop
* @param null $pos
*
* @since LESSC
*/
protected function append($prop, $pos = null)
{
if ($pos !== null) $prop[-1] = $pos;
$this->env->props[] = $prop;
}
// pop something off the stack
/**
* @return mixed
* @since LESSC
*/
protected function pop()
{
$old = $this->env;
$this->env = $this->env->parent;
return $old;
}
// remove comments from $text
// todo: make it work for all functions, not just url
/**
* @param $text
*
* @return string
* @since LESSC
*/
protected function removeComments($text)
{
$look = [
'url(', '//', '/*', '"', "'",
];
$out = '';
$min = null;
while (true)
{
// find the next item
foreach ($look as $token)
{
$pos = strpos($text, $token);
if ($pos !== false)
{
if (!isset($min) || $pos < $min[1]) $min = [$token, $pos];
}
}
if (is_null($min)) break;
$count = $min[1];
$skip = 0;
$newlines = 0;
switch ($min[0])
{
case 'url(':
if (preg_match('/url\(.*?\)/', $text, $m, 0, $count))
$count += strlen($m[0]) - strlen($min[0]);
break;
case '"':
case "'":
if (preg_match('/' . $min[0] . '.*?(?<!\\\\)' . $min[0] . '/', $text, $m, 0, $count))
$count += strlen($m[0]) - 1;
break;
case '//':
$skip = strpos($text, "\n", $count);
if ($skip === false) $skip = strlen($text) - $count;
else $skip -= $count;
break;
case '/*':
if (preg_match('/\/\*.*?\*\//s', $text, $m, 0, $count))
{
$skip = strlen($m[0]);
$newlines = substr_count($m[0], "\n");
}
break;
}
if ($skip == 0) $count += strlen($min[0]);
$out .= substr($text, 0, $count) . str_repeat("\n", $newlines);
$text = substr($text, $count + $skip);
$min = null;
}
return $out . $text;
}
}
/**
* Class lessc_formatter_classic
*
* @since LESSC
*/
class lessc_formatter_classic
{
/**
* @var string
* @since LESSC
*/
public $indentChar = " ";
/**
* @var string
* @since LESSC
*/
public $break = "\n";
/**
* @var string
* @since LESSC
*/
public $open = " {";
/**
* @var string
* @since LESSC
*/
public $close = "}";
/**
* @var string
* @since LESSC
*/
public $selectorSeparator = ", ";
/**
* @var string
* @since LESSC
*/
public $assignSeparator = ":";
/**
* @var string
* @since LESSC
*/
public $openSingle = " { ";
/**
* @var string
* @since LESSC
*/
public $closeSingle = " }";
/**
* @var bool
* @since LESSC
*/
public $disableSingle = false;
/**
* @var bool
* @since LESSC
*/
public $breakSelectors = false;
/**
* @var bool
* @since LESSC
*/
public $compressColors = false;
/**
* lessc_formatter_classic constructor.
*
* @since LESS
*/
public function __construct()
{
$this->indentLevel = 0;
}
/**
* @param int $n
*
* @return string
* @since LESSC
*/
public function indentStr($n = 0)
{
return str_repeat($this->indentChar, max($this->indentLevel + $n, 0));
}
/**
* @param $name
* @param $value
*
* @return string
* @since LESSC
*/
public function property($name, $value)
{
return $name . $this->assignSeparator . $value . ";";
}
/**
* @param $block
*
* @return bool
* @since LESSC
*/
protected function isEmpty($block)
{
if (empty($block->lines))
{
foreach ($block->children as $child)
{
if (!$this->isEmpty($child)) return false;
}
return true;
}
return false;
}
/**
* @param $block
*
* @since LESSC
*/
public function block($block)
{
if ($this->isEmpty($block)) return;
$inner = $pre = $this->indentStr();
$isSingle = !$this->disableSingle &&
is_null($block->type) && count($block->lines) == 1;
if (!empty($block->selectors))
{
$this->indentLevel++;
if ($this->breakSelectors)
{
$selectorSeparator = $this->selectorSeparator . $this->break . $pre;
}
else
{
$selectorSeparator = $this->selectorSeparator;
}
echo $pre .
implode($selectorSeparator, $block->selectors);
if ($isSingle)
{
echo $this->openSingle;
$inner = "";
}
else
{
echo $this->open . $this->break;
$inner = $this->indentStr();
}
}
if (!empty($block->lines))
{
$glue = $this->break . $inner;
echo $inner . implode($glue, $block->lines);
if (!$isSingle && !empty($block->children))
{
echo $this->break;
}
}
foreach ($block->children as $child)
{
$this->block($child);
}
if (!empty($block->selectors))
{
if (!$isSingle && empty($block->children)) echo $this->break;
if ($isSingle)
{
echo $this->closeSingle . $this->break;
}
else
{
echo $pre . $this->close . $this->break;
}
$this->indentLevel--;
}
}
}
/**
* Class lessc_formatter_compressed
*
* @since LESSC
*/
class lessc_formatter_compressed extends lessc_formatter_classic
{
/**
* @var bool
* @since LESSC
*/
public $disableSingle = true;
/**
* @var string
* @since LESSC
*/
public $open = "{";
/**
* @var string
* @since LESSC
*/
public $selectorSeparator = ",";
/**
* @var string
* @since LESSC
*/
public $assignSeparator = ":";
/**
* @var string
* @since LESSC
*/
public $break = "";
/**
* @var bool
* @since LESSC
*/
public $compressColors = true;
/**
* @param int $n
*
* @return string
* @since LESSC
*/
public function indentStr($n = 0)
{
return "";
}
}
/**
* Class lessc_formatter_lessjs
*
* @since LESSC
*/
class lessc_formatter_lessjs extends lessc_formatter_classic
{
/**
* @var bool
* @since LESSC
*/
public $disableSingle = true;
/**
* @var bool
* @since LESSC
*/
public $breakSelectors = true;
/**
* @var string
* @since LESSC
*/
public $assignSeparator = ": ";
/**
* @var string
* @since LESSC
*/
public $selectorSeparator = ",";
}