/app/protected/extensions/lessphp/lib/lessc.inc.php
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Possible License(s): BSD-3-Clause, GPL-2.0, LGPL-3.0, LGPL-2.1, BSD-2-Clause
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- <?php
- /**
- * lessphp v0.4.0
- * http://leafo.net/lessphp
- *
- * LESS CSS compiler, adapted from http://lesscss.org
- *
- * Copyright 2013, Leaf Corcoran <leafot@gmail.com>
- * 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 instance 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.
- */
- class lessc {
- static public $VERSION = "v0.4.0";
- static public $TRUE = array("keyword", "true");
- static public $FALSE = array("keyword", "false");
- protected $libFunctions = array();
- protected $registeredVars = array();
- protected $preserveComments = false;
- public $vPrefix = '@'; // prefix of abstract properties
- public $mPrefix = '$'; // prefix of abstract blocks
- public $parentSelector = '&';
- public $importDisabled = false;
- public $importDir = '';
- protected $numberPrecision = null;
- protected $allParsedFiles = array();
- // set to the parser that generated the current line when compiling
- // so we know how to create error messages
- protected $sourceParser = null;
- protected $sourceLoc = null;
- static protected $nextImportId = 0; // uniquely identify imports
- // attempts to find the path of an import url, returns null for css files
- protected function findImport($url) {
- foreach ((array)$this->importDir as $dir) {
- $full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
- if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
- return $file;
- }
- }
- return null;
- }
- protected function fileExists($name) {
- return is_file($name);
- }
- static public function compressList($items, $delim) {
- if (!isset($items[1]) && isset($items[0])) return $items[0];
- else return array('list', $delim, $items);
- }
- static public function preg_quote($what) {
- return preg_quote($what, '/');
- }
- protected function tryImport($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 array(false, "/* import disabled */");
- }
- if (isset($this->allParsedFiles[realpath($realPath)])) {
- return array(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 array(true, $bottom, $parser, $dir);
- }
- protected function compileImportedProps($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 = $oldSourceParser;
- }
- /**
- * Recursively compiles a block.
- *
- * A block is analogous to a CSS block in most cases. A single LESS document
- * is encapsulated in a block when parsed, but it does not have parent tags
- * so all of it's children appear on the root level when compiled.
- *
- * Blocks are made up of props and children.
- *
- * Props are property instructions, array tuples which describe an action
- * to be taken, eg. write a property, set a variable, mixin a block.
- *
- * The children of a block are just all the blocks that are defined within.
- * This is used to look up mixins when performing a mixin.
- *
- * Compiling the block involves pushing a fresh environment on the stack,
- * and iterating through the props, compiling each one.
- *
- * See lessc::compileProp()
- *
- */
- protected function compileBlock($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, array($name));
- break;
- default:
- $this->throwError("unknown block type: $block->type\n");
- }
- }
- protected function compileCSSBlock($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!
- $this->popEnv();
- }
- protected function compileMedia($media) {
- $env = $this->pushEnv($media);
- $parentScope = $this->mediaParent($this->scope);
- $query = $this->compileMediaQuery($this->multiplyMedia($env));
- $this->scope = $this->makeOutputBlock($media->type, array($query));
- $parentScope->children[] = $this->scope;
- $this->compileProps($media, $this->scope);
- if (count($this->scope->lines) > 0) {
- $orphanSelelectors = $this->findClosestSelectors();
- if (!is_null($orphanSelelectors)) {
- $orphan = $this->makeOutputBlock(null, $orphanSelelectors);
- $orphan->lines = $this->scope->lines;
- array_unshift($this->scope->children, $orphan);
- $this->scope->lines = array();
- }
- }
- $this->scope = $this->scope->parent;
- $this->popEnv();
- }
- protected function mediaParent($scope) {
- while (!empty($scope->parent)) {
- if (!empty($scope->type) && $scope->type != "media") {
- break;
- }
- $scope = $scope->parent;
- }
- return $scope;
- }
- protected function compileNestedBlock($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;
- $this->popEnv();
- }
- protected function compileRoot($root) {
- $this->pushEnv();
- $this->scope = $this->makeOutputBlock($root->type);
- $this->compileProps($root, $this->scope);
- $this->popEnv();
- }
- protected function compileProps($block, $out) {
- foreach ($this->sortProps($block->props) as $prop) {
- $this->compileProp($prop, $block, $out);
- }
- $out->lines = $this->deduplicate($out->lines);
- }
- /**
- * Deduplicate lines in a block. Comments are not deduplicated. If a
- * duplicate rule is detected, the comments immediately preceding each
- * occurence are consolidated.
- */
- protected function deduplicate($lines) {
- $unique = array();
- $comments = array();
- foreach($lines as $line) {
- if (strpos($line, '/*') === 0) {
- $comments[] = $line;
- continue;
- }
- if (!in_array($line, $unique)) {
- $unique[] = $line;
- }
- array_splice($unique, array_search($line, $unique), 0, $comments);
- $comments = array();
- }
- return array_merge($unique, $comments);
- }
- protected function sortProps($props, $split = false) {
- $vars = array();
- $imports = array();
- $other = array();
- $stack = array();
- foreach ($props as $prop) {
- switch ($prop[0]) {
- case "comment":
- $stack[] = $prop;
- break;
- case "assign":
- $stack[] = $prop;
- if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix) {
- $vars = array_merge($vars, $stack);
- } else {
- $other = array_merge($other, $stack);
- }
- $stack = array();
- break;
- case "import":
- $id = self::$nextImportId++;
- $prop[] = $id;
- $stack[] = $prop;
- $imports = array_merge($imports, $stack);
- $other[] = array("import_mixin", $id);
- $stack = array();
- break;
- default:
- $stack[] = $prop;
- $other = array_merge($other, $stack);
- $stack = array();
- break;
- }
- }
- $other = array_merge($other, $stack);
- if ($split) {
- return array(array_merge($vars, $imports), $other);
- } else {
- return array_merge($vars, $imports, $other);
- }
- }
- protected function compileMediaQuery($queries) {
- $compiledQueries = array();
- foreach ($queries as $query) {
- $parts = array();
- foreach ($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 $out;
- }
- protected function multiplyMedia($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 = array();
- $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, $out);
- }
- protected function expandParentSelectors(&$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;
- }
- 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 $selectors against the nearest selectors in env
- protected function multiplySelectors($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;
- }
- $out = array();
- foreach ($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 $out;
- }
- // reduces selector expressions
- protected function compileSelectors($selectors) {
- $out = array();
- foreach ($selectors as $s) {
- if (is_array($s)) {
- list(, $value) = $s;
- $out[] = trim($this->compileValue($this->reduce($value)));
- } else {
- $out[] = $s;
- }
- }
- return $out;
- }
- protected function eq($left, $right) {
- return $left == $right;
- }
- protected function patternMatch($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) {
- $remainingArgs = array();
- foreach ($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);
- }
- }
- protected function patternMatchAll($blocks, $orderedArgs, $keywordArgs, $skip=array()) {
- $matches = null;
- foreach ($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 $matches;
- }
- // attempt to find blocks matched by path and args
- protected function findBlocks($searchIn, $path, $orderedArgs, $keywordArgs, $seen=array()) {
- if ($searchIn == null) return null;
- if (isset($seen[$searchIn->id])) return null;
- $seen[$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 {
- $matches = array();
- foreach ($blocks as $subBlock) {
- $subMatches = $this->findBlocks($subBlock,
- array_slice($path, 1), $orderedArgs, $keywordArgs, $seen);
- if (!is_null($subMatches)) {
- foreach ($subMatches as $sm) {
- $matches[] = $sm;
- }
- }
- }
- return count($matches) > 0 ? $matches : null;
- }
- }
- if ($searchIn->parent === $searchIn) return null;
- 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 $values
- protected function zipSetArgs($args, $orderedValues, $keywordValues) {
- $assignedValues = array();
- $i = 0;
- foreach ($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(array("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 $blocks appropriately
- protected function compileProp($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 = array();
- $keywordArgs = array();
- foreach ((array)$args as $arg) {
- $argval = null;
- switch ($arg[0]) {
- case "arg":
- if (!isset($arg[2])) {
- $orderedArgs[] = $this->reduce(array("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) {
- $this->throwError("{$prop[1][0]} is undefined");
- }
- 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)
- {
- $subProp[2] = array(
- 'list', ' ',
- array($subProp[2], array('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 = array();
- }
- $result = $this->tryImport($importPath, $block, $out);
- $this->env->imports[$importId] = $result === false ?
- array(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.
- */
- protected function compileValue($value) {
- switch ($value[0]) {
- case 'list':
- // [1] - delimiter
- // [2] - array of values
- return implode($value[1], array_map(array($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: $value[0]");
- }
- }
- protected function lib_pow($args) {
- list($base, $exp) = $this->assertArgs($args, 2, "pow");
- return pow($this->assertNumber($base), $this->assertNumber($exp));
- }
- protected function lib_pi() {
- return pi();
- }
- protected function lib_mod($args) {
- list($a, $b) = $this->assertArgs($args, 2, "mod");
- return $this->assertNumber($a) % $this->assertNumber($b);
- }
- protected function lib_tan($num) {
- return tan($this->assertNumber($num));
- }
- protected function lib_sin($num) {
- return sin($this->assertNumber($num));
- }
- protected function lib_cos($num) {
- return cos($this->assertNumber($num));
- }
- protected function lib_atan($num) {
- $num = atan($this->assertNumber($num));
- return array("number", $num, "rad");
- }
- protected function lib_asin($num) {
- $num = asin($this->assertNumber($num));
- return array("number", $num, "rad");
- }
- protected function lib_acos($num) {
- $num = acos($this->assertNumber($num));
- return array("number", $num, "rad");
- }
- protected function lib_sqrt($num) {
- return sqrt($this->assertNumber($num));
- }
- 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];
- }
- }
- protected function lib_isnumber($value) {
- return $this->toBool($value[0] == "number");
- }
- protected function lib_isstring($value) {
- return $this->toBool($value[0] == "string");
- }
- protected function lib_iscolor($value) {
- return $this->toBool($this->coerceColor($value));
- }
- protected function lib_iskeyword($value) {
- return $this->toBool($value[0] == "keyword");
- }
- protected function lib_ispixel($value) {
- return $this->toBool($value[0] == "number" && $value[2] == "px");
- }
- protected function lib_ispercentage($value) {
- return $this->toBool($value[0] == "number" && $value[2] == "%");
- }
- protected function lib_isem($value) {
- return $this->toBool($value[0] == "number" && $value[2] == "em");
- }
- protected function lib_isrem($value) {
- return $this->toBool($value[0] == "number" && $value[2] == "rem");
- }
- protected function lib_rgbahex($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], $color[3]);
- }
- protected function lib_argb($color){
- return $this->lib_rgbahex($color);
- }
- /**
- * Given an url, decide whether to output a regular link or the base64-encoded contents of the file
- *
- * @param array $value either an argument list (two strings) or a single string
- * @return string formatted url(), either as a link or base64-encoded
- */
- protected function lib_data_uri($value) {
- $mime = ($value[0] === 'list') ? $value[2][0][2] : null;
- $url = ($value[0] === 'list') ? $value[2][1][2][0] : $value[2][0];
- $fullpath = $this->findImport($url);
- if($fullpath && ($fsize = filesize($fullpath)) !== false) {
- // IE8 can't handle data uris larger than 32KB
- if($fsize/1024 < 32) {
- if(is_null($mime)) {
- if(class_exists('finfo')) { // php 5.3+
- $finfo = new finfo(FILEINFO_MIME);
- $mime = explode('; ', $finfo->file($fullpath));
- $mime = $mime[0];
- } elseif(function_exists('mime_content_type')) { // PHP 5.2
- $mime = mime_content_type($fullpath);
- }
- }
- if(!is_null($mime)) // fallback if the mime type is still unknown
- $url = sprintf('data:%s;base64,%s', $mime, base64_encode(file_get_contents($fullpath)));
- }
- }
- return 'url("'.$url.'")';
- }
- // utility func to unquote a string
- protected function lib_e($arg) {
- switch ($arg[0]) {
- case "list":
- $items = $arg[2];
- if (isset($items[0])) {
- return $this->lib_e($items[0]);
- }
- $this->throwError("unrecognised input");
- case "string":
- $arg[1] = "";
- return $arg;
- case "keyword":
- return $arg;
- default:
- return array("keyword", $this->compileValue($arg));
- }
- }
- 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[$i]) : array('keyword', '');
- // lessjs compat, renders fully expanded color, not raw color
- if ($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 array("string", $d, array($template));
- }
- protected function lib_floor($arg) {
- $value = $this->assertNumber($arg);
- return array("number", floor($value), $arg[2]);
- }
- protected function lib_ceil($arg) {
- $value = $this->assertNumber($arg);
- return array("number", ceil($value), $arg[2]);
- }
- protected function lib_round($arg) {
- if($arg[0] != "list") {
- $value = $this->assertNumber($arg);
- return array("number", round($value), $arg[2]);
- } else {
- $value = $this->assertNumber($arg[2][0]);
- $precision = $this->assertNumber($arg[2][1]);
- return array("number", round($value, $precision), $arg[2][0][2]);
- }
- }
- protected function lib_unit($arg) {
- if ($arg[0] == "list") {
- list($number, $newUnit) = $arg[2];
- return array("number", $this->assertNumber($number),
- $this->compileValue($this->lib_e($newUnit)));
- } else {
- return array("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
- */
- public function colorArgs($args) {
- if ($args[0] != 'list' || count($args[2]) < 2) {
- return array(array('color', 0, 0, 0), 0);
- }
- list($color, $delta) = $args[2];
- $color = $this->assertColor($color);
- $delta = floatval($delta[1]);
- return array($color, $delta);
- }
- protected function lib_darken($args) {
- list($color, $delta) = $this->colorArgs($args);
- $hsl = $this->toHSL($color);
- $hsl[3] = $this->clamp($hsl[3] - $delta, 100);
- return $this->toRGB($hsl);
- }
- 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);
- }
- 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);
- }
- 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);
- }
- 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);
- }
- protected function lib_fadeout($args) {
- list($color, $delta) = $this->colorArgs($args);
- $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
- return $color;
- }
- protected function lib_fadein($args) {
- list($color, $delta) = $this->colorArgs($args);
- $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
- return $color;
- }
- protected function lib_hue($color) {
- $hsl = $this->toHSL($this->assertColor($color));
- return round($hsl[1]);
- }
- protected function lib_saturation($color) {
- $hsl = $this->toHSL($this->assertColor($color));
- return round($hsl[2]);
- }
- 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
- protected function lib_alpha($value) {
- if (!is_null($color = $this->coerceColor($value))) {
- return isset($color[4]) ? $color[4] : 1;
- }
- }
- // set the alpha of the color
- protected function lib_fade($args) {
- list($color, $alpha) = $this->colorArgs($args);
- $color[4] = $this->clamp($alpha / 100.0);
- return $color;
- }
- protected function lib_percentage($arg) {
- $num = $this->assertNumber($arg);
- return array("number", $num*100, "%");
- }
- // mixes two colors by weight
- // mix(@color1, @color2, [@weight: 50%]);
- // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
- protected function lib_mix($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 = array('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);
- }
- protected function lib_contrast($args) {
- $darkColor = array('color', 0, 0, 0);
- $lightColor = array('color', 255, 255, 255);
- $threshold = 0.43;
- if ( $args[0] == 'list' ) {
- $inputColor = ( isset($args[2][0]) ) ? $this->assertColor($args[2][0]) : $lightColor;
- $darkColor = ( isset($args[2][1]) ) ? $this->assertColor($args[2][1]) : $darkColor;
- $lightColor = ( isset($args[2][2]) ) ? $this->assertColor($args[2][2]) : $lightColor;
- $threshold = ( isset($args[2][3]) ) ? $this->assertNumber($args[2][3]) : $threshold;
- }
- else {
- $inputColor = $this->assertColor($args);
- }
- $inputColor = $this->coerceColor($inputColor);
- $darkColor = $this->coerceColor($darkColor);
- $lightColor = $this->coerceColor($lightColor);
- //Figure out which is actually light and dark!
- if ( $this->lib_luma($darkColor) > $this->lib_luma($lightColor) ) {
- $t = $lightColor;
- $lightColor = $darkColor;
- $darkColor = $t;
- }
- $inputColor_alpha = $this->lib_alpha($inputColor);
- if ( ( $this->lib_luma($inputColor) * $inputColor_alpha) < $threshold) {
- return $lightColor;
- }
- return $darkColor;
- }
- protected function lib_luma($color) {
- $color = $this->coerceColor($color);
- return (0.2126 * $color[0] / 255) + (0.7152 * $color[1] / 255) + (0.0722 * $color[2] / 255);
- }
- public function assertColor($value, $error = "expected color value") {
- $color = $this->coerceColor($value);
- if (is_null($color)) $this->throwError($error);
- return $color;
- }
- public function assertNumber($value, $error = "expecting number") {
- if ($value[0] == "number") return $value[1];
- $this->throwError($error);
- }
- public 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 $values;
- }
- }
- protected function toHSL($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);
- }
- $out = array('hsl',
- ($H < 0 ? $H + 6 : $H)*60,
- $S*100,
- $L*100,
- );
- if (count($color) > 4) $out[] = $color[4]; // copy alpha
- return $out;
- }
- protected function toRGB_helper($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 $temp1;
- }
- /**
- * Converts a hsl array into a color value in rgb.
- * Expects H to be in range of 0 to 360, S and L in 0 to 100
- */
- protected function toRGB($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 = array('color', $r*255, $g*255, $b*255);
- if (count($color) > 4) $out[] = $color[4]; // copy alpha
- return $out;
- }
- protected function clamp($v, $max = 1, $min = 0) {
- return min($max, max($min, $v));
- }
- /**
- * Convert the rgb, rgba, hsl color literals of function type
- * as returned by the parser into values of color type.
- */
- protected function funcToColor($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 = array('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 = array();
- $i = 1;
- foreach ($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;
- }
- protected function reduce($value, $forExpression = false) {
- switch ($value[0]) {
- case "interpolate":
- $reduced = $this->reduce($value[1]);
- $var = $this->compileValue($reduced);
- $res = $this->reduce(array("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));
- $seen[$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->funcToColo…
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