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+<?php
+
+/**
+ * lessphp v0.3.5
+ * http://leafo.net/lessphp
+ *
+ * LESS css compiler, adapted from http://lesscss.org
+ *
+ * Copyright 2012, Leaf Corcoran <leafot@gmail.com>
+ * Licensed under MIT or GPLv3, see LICENSE
+ */
+
+
+/**
+ * The less compiler and parser.
+ *
+ * Converting LESS to CSS is a two stage process. The incoming file is parsed
+ * by `lessc_parser` into a tree, then compiled to CSS text by `lessc`. The
+ * compile step has an implicit step called reduction, where values are brought
+ * to their lowest form before being turned to text, eg. mathematical equations
+ * are solved, and variables are dereferenced.
+ *
+ * The `lessc` class creates an intstance of the parser, feeds it LESS code, then
+ * compiles the resulting tree to CSS
+ *
+ * The `lessc_parser` class is only concerned with parsing its input.
+ *
+ * The `lessc_formatter` classes are used to format the output of the CSS,
+ * controlling things like whitespace and line-breaks.
+ */
+class lessc {
+ static public $VERSION = "v0.3.5";
+ static protected $TRUE = array("keyword", "true");
+ static protected $FALSE = array("keyword", "false");
+
+ protected $libFunctions = array();
+
+ protected $indentLevel;
+
+ protected $env = null;
+
+ protected $allParsedFiles = array();
+
+ public $vPrefix = '@'; // prefix of abstract properties
+ public $mPrefix = '$'; // prefix of abstract blocks
+ public $parentSelector = '&';
+
+ // types that must be reduced before being compiled
+ static protected $dtypes = array('expression', 'variable',
+ 'function', 'negative', 'list', 'lookup');
+
+ public $importDisabled = false;
+ public $importDir = '';
+
+ public $compat = true; // lessjs compatibility mode, does nothing right now
+
+ // set to the parser that generated the current line when compiling
+ // so we know how to create error messages
+ protected $sourceParser = null;
+ protected $sourceLoc = null;
+
+ // attempts to find the path of an import url, returns null for css files
+ function findImport($url) {
+ foreach ((array)$this->importDir as $dir) {
+ $full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
+ if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
+ return $file;
+ }
+ }
+
+ return null;
+ }
+
+ function fileExists($name) {
+ return is_file($name);
+ }
+
+ static function compressList($items, $delim) {
+ if (count($items) == 1) return $items[0];
+ else return array('list', $delim, $items);
+ }
+
+ static function preg_quote($what) {
+ return preg_quote($what, '/');
+ }
+
+ // just do a shallow property merge, seems to be what lessjs does
+ function mergeBlock($target, $from) {
+ $target = clone $target;
+ $target->props = array_merge($target->props, $from->props);
+ return $target;
+ }
+
+ // attempt to import $import into $parentBlock
+ // $props is the property array that will given to $parentBlock at the end
+ function mixImport($import, $parentBlock, &$props) {
+ list(, $url, $media) = $import;
+
+ if (empty($media) && substr_compare($url, '.css', -4, 4) !== 0) {
+ if ($this->importDisabled) {
+ $props[] = array('raw', '/* import disabled */');
+ return true;
+ }
+
+ $realPath = $this->findImport($url);
+ if (!is_null($realPath)) {
+ $this->addParsedFile($realPath);
+
+ $parser = new lessc_parser($this, $realPath);
+ $root = $parser->parse(file_get_contents($realPath));
+ $root->isRoot = false;
+ $root->parent = $parentBlock;
+
+ // handle all the imports in the new file
+ $pi = pathinfo($realPath);
+ $this->mixImports($root, $pi['dirname'].'/');
+
+ // inject imported blocks into this block, local will overwrite import
+ $parentBlock->children =
+ array_merge($root->children,$parentBlock->children);
+
+ // splice in the props
+ foreach ($root->props as $prop) {
+ // leave a reference to the file where it came from
+ if (isset($prop[-1]) && !is_array($prop[-1])) {
+ $prop[-1] = array($parser, $prop[-1]);
+ }
+ $props[] = $prop;
+ }
+
+ return true;
+ }
+ }
+
+ // fallback to regular css import
+ $props[] = array('raw', '@import url("'.$url.'")'.($media ? ' '.$media : '').';');
+ return false;
+ }
+
+ // import all imports mentioned in the block
+ function mixImports($block, $importDir = null) {
+ $oldImport = $this->importDir;
+ if (!is_null($importDir)) {
+ $this->importDir = array_merge((array)$importDir, (array)$this->importDir);
+ }
+
+ $props = array();
+ foreach ($block->props as $prop) {
+ if ($prop[0] == 'import') {
+ $this->mixImport($prop, $block, $props);
+ } else {
+ $props[] = $prop;
+ }
+ }
+ $block->props = $props;
+ $this->importDir = $oldImport;
+ }
+
+ /**
+ * Recursively compiles a block.
+ * @param $block the block
+ * @param $parentTags the tags of the block that contained this one
+ *
+ * A block is analogous to a CSS block in most cases. A single less document
+ * is encapsulated in a block when parsed, but it does not have parent tags
+ * so all of it's children appear on the root level when compiled.
+ *
+ * Blocks are made up of props and children.
+ *
+ * Props are property instructions, array tuples which describe an action
+ * to be taken, eg. write a property, set a variable, mixin a block.
+ *
+ * The children of a block are just all the blocks that are defined within.
+ *
+ * Compiling the block involves pushing a fresh environment on the stack,
+ * and iterating through the props, compiling each one.
+ *
+ * See lessc::compileProp()
+ *
+ */
+ function compileBlock($block, $parent_tags = null) {
+ if (!empty($block->no_multiply)) {
+ $special_block = true;
+ $tags = array();
+ } else {
+ $special_block = false;
+
+ // evaluate expression tags
+ $tags = null;
+ if (is_array($block->tags)) {
+ $tags = array();
+ foreach ($block->tags as $tag) {
+ if (is_array($tag)) {
+ list(, $value) = $tag;
+ $tags[] = $this->compileValue($this->reduce($value));
+ } else {
+ $tags[] = $tag;
+ }
+ }
+ }
+
+ $tags = $this->multiplyTags($parent_tags, $tags);
+ }
+
+ $env = $this->pushEnv();
+ $env->nameDepth = array();
+
+ $lines = array();
+ $blocks = array();
+ $this->mixImports($block);
+
+ $idelta = $this->formatter->indentAmount($block);
+ $this->indentLevel += $idelta;
+
+ foreach ($this->sortProps($block->props) as $prop) {
+ $this->compileProp($prop, $block, $tags, $lines, $blocks);
+ }
+ $this->indentLevel -= $idelta;
+
+ $block->scope = $env;
+
+ $this->pop();
+
+ // override tags if it's a special block
+ if (isset($block->media)) {
+ $tags = $this->compileMedia($block);
+ } elseif (isset($block->keyframes)) {
+ $tags = $block->tags[0]." ".
+ $this->compileValue($this->reduce($block->keyframes));
+ } elseif ($special_block) { // font-face and the like
+ $tags = $block->tags[0];
+ }
+
+ return $this->formatter->block($tags, $special_block, $lines,
+ $blocks, $this->indentLevel);
+ }
+
+ function sortProps($props) {
+ $out = array();
+ foreach ($props as $prop) {
+ if ($prop[0] == "assign") $out[] = $prop;
+ }
+
+ foreach ($props as $prop) {
+ if ($prop[0] != "assign") $out[] = $prop;
+ }
+
+ return $out;
+ }
+
+ function expandParentSelectors(&$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 $count;
+ }
+
+ // find the fully qualified tags for a block and its parent's tags
+ function multiplyTags($parents, $current) {
+ if ($parents == null) {
+ if (is_array($current)) {
+ // get rid of parent selectors and escapes in top level tag
+ foreach ($current as &$tag) {
+ $this->expandParentSelectors($tag, "");
+ }
+ }
+ return $current;
+ }
+
+ $tags = array();
+ foreach ($parents as $ptag) {
+ foreach ($current as $tag) {
+ $count = $this->expandParentSelectors($tag, $ptag);
+
+ // don't prepend the parent tag if & was used
+ if ($count > 0) {
+ $tags[] = trim($tag);
+ } else {
+ $tags[] = trim($ptag . ' ' . $tag);
+ }
+ }
+ }
+
+ return $tags;
+ }
+
+ function eq($left, $right) {
+ return $left == $right;
+ }
+
+ function patternMatch($block, $callingArgs) {
+ // match the guards if it has them
+ // any one of the groups must have all its guards pass for a match
+ if (!empty($block->guards)) {
+ $group_passed = false;
+ foreach ($block->guards as $guard_group) {
+ foreach ($guard_group as $guard) {
+ $this->pushEnv();
+ $this->zipSetArgs($block->args, $callingArgs);
+
+ $negate = false;
+ if ($guard[0] == "negate") {
+ $guard = $guard[1];
+ $negate = true;
+ }
+
+ $passed = $this->reduce($guard) == self::$TRUE;
+ if ($negate) $passed = !$passed;
+
+ $this->pop();
+
+ if ($passed) {
+ $group_passed = true;
+ } else {
+ $group_passed = false;
+ break;
+ }
+ }
+
+ if ($group_passed) break;
+ }
+
+ if (!$group_passed) {
+ return false;
+ }
+ }
+
+ $numCalling = count($callingArgs);
+
+ if (empty($block->args)) {
+ return $block->is_vararg || $numCalling == 0;
+ }
+
+ $i = -1; // no args
+ // try to match by arity or by argument literal
+ foreach ($block->args as $i => $arg) {
+ switch ($arg[0]) {
+ case "lit":
+ if (empty($callingArgs[$i]) || !$this->eq($arg[1], $callingArgs[$i])) {
+ return false;
+ }
+ break;
+ case "arg":
+ // no arg and no default value
+ if (!isset($callingArgs[$i]) && !isset($arg[2])) {
+ return false;
+ }
+ break;
+ case "rest":
+ $i--; // rest can be empty
+ break 2;
+ }
+ }
+
+ if ($block->is_vararg) {
+ return true; // not having enough is handled above
+ } else {
+ $numMatched = $i + 1;
+ // greater than becuase default values always match
+ return $numMatched >= $numCalling;
+ }
+ }
+
+ function patternMatchAll($blocks, $callingArgs) {
+ $matches = null;
+ foreach ($blocks as $block) {
+ if ($this->patternMatch($block, $callingArgs)) {
+ $matches[] = $block;
+ }
+ }
+
+ return $matches;
+ }
+
+ // attempt to find blocks matched by path and args
+ function findBlocks($search_in, $path, $args, $seen=array()) {
+ if ($search_in == null) return null;
+ if (isset($seen[$search_in->id])) return null;
+ $seen[$search_in->id] = true;
+
+ $name = $path[0];
+
+ if (isset($search_in->children[$name])) {
+ $blocks = $search_in->children[$name];
+ if (count($path) == 1) {
+ $matches = $this->patternMatchAll($blocks, $args);
+ if (!empty($matches)) {
+ // This will return all blocks that match in the closest
+ // scope that has any matching block, like lessjs
+ return $matches;
+ }
+ } else {
+ return $this->findBlocks($blocks[0],
+ array_slice($path, 1), $args, $seen);
+ }
+ }
+
+ if ($search_in->parent === $search_in) return null;
+ return $this->findBlocks($search_in->parent, $path, $args, $seen);
+ }
+
+ // sets all argument names in $args to either the default value
+ // or the one passed in through $values
+ function zipSetArgs($args, $values) {
+ $i = 0;
+ $assigned_values = array();
+ foreach ($args as $a) {
+ if ($a[0] == "arg") {
+ if ($i < count($values) && !is_null($values[$i])) {
+ $value = $values[$i];
+ } elseif (isset($a[2])) {
+ $value = $a[2];
+ } else $value = null;
+
+ $value = $this->reduce($value);
+ $this->set($a[1], $value);
+ $assigned_values[] = $value;
+ }
+ $i++;
+ }
+
+ // check for a rest
+ $last = end($args);
+ if ($last[0] == "rest") {
+ $rest = array_slice($values, count($args) - 1);
+ $this->set($last[1], $this->reduce(array("list", " ", $rest)));
+ }
+
+ $this->env->arguments = $assigned_values;
+ }
+
+ // compile a prop and update $lines or $blocks appropriately
+ function compileProp($prop, $block, $tags, &$_lines, &$_blocks) {
+ // set error position context
+ if (isset($prop[-1])) {
+ if (is_array($prop[-1])) {
+ list($parser, $count) = $prop[-1];
+ $this->sourceParser = $parser;
+ $this->sourceLoc = $count;
+ } else {
+ $this->sourceParser = $this->parser;
+ $this->sourceLoc = $prop[-1];
+ }
+ } else {
+ $this->sourceLoc = -1;
+ }
+
+ switch ($prop[0]) {
+ case 'assign':
+ list(, $name, $value) = $prop;
+ if ($name[0] == $this->vPrefix) {
+ $this->set($name, $value);
+ } else {
+ $_lines[] = "$name:".
+ $this->compileValue($this->reduce($value)).";";
+ }
+ break;
+ case 'block':
+ list(, $child) = $prop;
+ $_blocks[] = $this->compileBlock($child, $tags);
+ break;
+ case 'mixin':
+ list(, $path, $args, $suffix) = $prop;
+
+ $args = array_map(array($this, "reduce"), (array)$args);
+ $mixins = $this->findBlocks($block, $path, $args);
+ if (is_null($mixins)) {
+ // echo "failed to find block: ".implode(" > ", $path)."\n";
+ break; // throw error here??
+ }
+
+ foreach ($mixins as $mixin) {
+ $old_scope = null;
+ if (isset($mixin->parent->scope)) {
+ $old_scope = $this->env;
+ $this->env = $mixin->parent->scope;
+ }
+
+ $have_args = false;
+ if (isset($mixin->args)) {
+ $have_args = true;
+ $this->pushEnv();
+ $this->zipSetArgs($mixin->args, $args);
+ }
+
+ $old_parent = $mixin->parent;
+ if ($mixin != $block) $mixin->parent = $block;
+
+ foreach ($this->sortProps($mixin->props) as $sub_prop) {
+ if($suffix !== null) {
+ $sub_prop[2] = array(
+ 'list', ' ',
+ array($sub_prop[2], array('keyword', $suffix))
+ );
+ }
+
+ $this->compileProp($sub_prop, $mixin, $tags, $_lines, $_blocks);
+ }
+
+ $mixin->parent = $old_parent;
+
+ if ($have_args) $this->pop();
+
+ if ($old_scope) {
+ $this->env = $old_scope;
+ }
+ }
+
+ break;
+ case 'raw':
+ $_lines[] = $prop[1];
+ break;
+ case 'charset':
+ list(, $value) = $prop;
+ $_lines[] = '@charset '.$this->compileValue($this->reduce($value)).';';
+ 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.
+ */
+ 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 'keyword':
+ // [1] - the keyword
+ case 'number':
+ // [1] - the number
+ return $value[1];
+ case 'escape':
+ case 'string':
+ // [1] - contents of string (includes quotes)
+
+ // search for inline variables to replace
+ $replace = array();
+ if (preg_match_all('/'.self::preg_quote($this->vPrefix).'\{([\w-_][0-9\w-_]*)\}/', $value[1], $m)) {
+ foreach ($m[1] as $name) {
+ if (!isset($replace[$name]))
+ $replace[$name] = $this->compileValue($this->reduce(array('variable', $this->vPrefix . $name)));
+ }
+ }
+
+ foreach ($replace as $var=>$val) {
+ if ($this->quoted($val)) {
+ $val = substr($val, 1, -1);
+ }
+ $value[1] = str_replace($this->vPrefix. '{'.$var.'}', $val, $value[1]);
+ }
+
+ return $value[1];
+ case 'color':
+ // [1] - red component (either number for 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, $b);
+
+ // Converting hex color to short notation (e.g. #003399 to #039)
+ if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
+ $h = '#' . $h[1] . $h[3] . $h[5];
+ }
+
+ return $h;
+
+ case 'function':
+ // [1] - function name
+ // [2] - some array value representing arguments, either ['string', value] or ['list', ',', values[]]
+
+ // see if function evaluates to something else
+ $value = $this->reduce($value);
+ if ($value[0] == 'function') {
+ return $value[1].'('.$this->compileValue($value[2]).')';
+ }
+ else return $this->compileValue($value);
+ default: // assumed to be unit
+ return $value[1].$value[0];
+ }
+ }
+
+ function compileMedia($block) {
+ $mediaParts = array();
+ foreach ($block->media as $part) {
+ if ($part[0] == "raw") {
+ $mediaParts[] = $part[1];
+ } elseif ($part[0] == "assign") {
+ list(, $propName, $propVal) = $part;
+ $mediaParts[] = "$propName: ".
+ $this->compileValue($this->reduce($propVal));
+ }
+ }
+
+ return "@media ".trim(implode($mediaParts));
+ }
+
+ function lib_isnumber($value) {
+ return $this->toBool(is_numeric($value[1]) && $value[0] != "color");
+ }
+
+ function lib_isstring($value) {
+ return $this->toBool($value[0] == "string");
+ }
+
+ function lib_iscolor($value) {
+ return $this->toBool($this->coerceColor($value));
+ }
+
+ function lib_iskeyword($value) {
+ return $this->toBool($value[0] == "keyword");
+ }
+
+ function lib_ispixel($value) {
+ return $this->toBool($value[0] == "px");
+ }
+
+ function lib_ispercentage($value) {
+ return $this->toBool($value[0] == "%");
+ }
+
+ function lib_isem($value) {
+ return $this->toBool($value[0] == "em");
+ }
+
+ 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 : 0,
+ $color[1],$color[2], $color[3]);
+ }
+
+ function lib_argb($color){
+ return $this->lib_rgbahex($color);
+ }
+
+ // utility func to unquote a string
+ function lib_e($arg) {
+ switch ($arg[0]) {
+ case "list":
+ $items = $arg[2];
+ if (isset($items[0])) {
+ return $this->lib_e($items[0]);
+ }
+ return "";
+ case "string":
+ $str = $this->compileValue($arg);
+ return substr($str, 1, -1);
+ default:
+ return $this->compileValue($arg);
+ }
+ }
+
+ function lib__sprintf($args) {
+ if ($args[0] != "list") return $args;
+ $values = $args[2];
+ $source = $this->reduce(array_shift($values));
+ if ($source[0] != "string") {
+ return $source;
+ }
+
+ $str = $source[1];
+ $i = 0;
+ if (preg_match_all('/%[dsa]/', $str, $m)) {
+ foreach ($m[0] as $match) {
+ $val = isset($values[$i]) ? $this->reduce($values[$i]) : array('keyword', '');
+ $i++;
+ switch ($match[1]) {
+ case "s":
+ if ($val[0] == "string") {
+ $rep = substr($val[1], 1, -1);
+ break;
+ }
+ default:
+ $rep = $this->compileValue($val);
+ }
+ $str = preg_replace('/'.self::preg_quote($match).'/', $rep, $str, 1);
+ }
+ }
+
+ return array('string', $str);
+ }
+
+ function lib_floor($arg) {
+ return array($arg[0], floor($arg[1]));
+ }
+
+ function lib_ceil($arg) {
+ return array($arg[0], ceil($arg[1]));
+ }
+
+ function lib_round($arg) {
+ return array($arg[0], round($arg[1]));
+ }
+
+ // is a string surrounded in quotes? returns the quoting char if true
+ function quoted($s) {
+ if (preg_match('/^("|\').*?\1$/', $s, $m))
+ return $m[1];
+ else return false;
+ }
+
+ /**
+ * Helper function to get arguments for color functions.
+ * Accepts invalid input, non colors interpreted as being black.
+ */
+ function colorArgs($args) {
+ if ($args[0] != 'list' || count($args[2]) < 2) {
+ return array(array('color', 0, 0, 0));
+ }
+ list($color, $delta) = $args[2];
+ $color = $this->coerceColor($color);
+ if (is_null($color))
+ $color = array('color', 0, 0, 0);
+
+ $delta = floatval($delta[1]);
+
+ return array($color, $delta);
+ }
+
+ function lib_darken($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+ $hsl[3] = $this->clamp($hsl[3] - $delta, 100);
+ return $this->toRGB($hsl);
+ }
+
+ 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);
+ }
+
+ 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);
+ }
+
+ 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);
+ }
+
+ 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);
+ }
+
+ function lib_fadeout($args) {
+ list($color, $delta) = $this->colorArgs($args);
+ $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
+ return $color;
+ }
+
+ function lib_fadein($args) {
+ list($color, $delta) = $this->colorArgs($args);
+ $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
+ return $color;
+ }
+
+ function lib_hue($color) {
+ if ($color[0] != 'color') return 0;
+ $hsl = $this->toHSL($color);
+ return round($hsl[1]);
+ }
+
+ function lib_saturation($color) {
+ if ($color[0] != 'color') return 0;
+ $hsl = $this->toHSL($color);
+ return round($hsl[2]);
+ }
+
+ function lib_lightness($color) {
+ if ($color[0] != 'color') return 0;
+ $hsl = $this->toHSL($color);
+ return round($hsl[3]);
+ }
+
+ // get the alpha of a color
+ // defaults to 1 for non-colors or colors without an alpha
+ function lib_alpha($color) {
+ if ($color[0] != 'color') return 1;
+ return isset($color[4]) ? $color[4] : 1;
+ }
+
+ // set the alpha of the color
+ function lib_fade($args) {
+ list($color, $alpha) = $this->colorArgs($args);
+ $color[4] = $this->clamp($alpha / 100.0);
+ return $color;
+ }
+
+ function lib_percentage($number) {
+ return array('%', $number[1]*100);
+ }
+
+ // mixes two colors by weight
+ // mix(@color1, @color2, @weight);
+ // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
+ function lib_mix($args) {
+ if ($args[0] != "list" || count($args[2]) < 3)
+ $this->throwError("mix expects (color1, color2, weight)");
+
+ list($first, $second, $weight) = $args[2];
+ $first = $this->assertColor($first);
+ $second = $this->assertColor($second);
+
+ $first_a = $this->lib_alpha($first);
+ $second_a = $this->lib_alpha($second);
+ $weight = $weight[1] / 100.0;
+
+ $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);
+ }
+
+ function assertColor($value, $error = "expected color value") {
+ $color = $this->coerceColor($value);
+ if (is_null($color)) $this->throwError($error);
+ return $color;
+ }
+
+ function toHSL($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 $out;
+ }
+
+ function toRGB_helper($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 $temp1;
+ }
+
+ /**
+ * Converts a hsl array into a color value in rgb.
+ * Expects H to be in range of 0 to 360, S and L in 0 to 100
+ */
+ function toRGB($color) {
+ if ($color == '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 $out;
+ }
+
+ function clamp($v, $max = 1, $min = 0) {
+ return min($max, max($min, $v));
+ }
+
+ /**
+ * Convert the rgb, rgba, hsl color literals of function type
+ * as returned by the parser into values of color type.
+ */
+ function funcToColor($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 < 4) $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] == '%') $components[] = 255 * ($c[1] / 100);
+ else $components[] = floatval($c[1]);
+ } elseif ($i == 4) {
+ if ($c[0] == '%') $components[] = 1.0 * ($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;
+ }
+
+ function toName($val) {
+ switch($val[0]) {
+ case "string":
+ return substr($val[1], 1, -1);
+ default:
+ return $val[1];
+ }
+ }
+
+ // reduce a delayed type to its final value
+ // dereference variables and solve equations
+ function reduce($var) {
+ // this is done here for infinite loop checking
+ if ($var[0] == "variable") {
+ $key = is_array($var[1]) ?
+ $this->vPrefix.$this->toName($this->reduce($var[1])) : $var[1];
+
+ $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 $out;
+ }
+
+ while (in_array($var[0], self::$dtypes)) {
+ if ($var[0] == 'list') {
+ foreach ($var[2] as &$value) $value = $this->reduce($value);
+ break;
+ } elseif ($var[0] == 'expression') {
+ $var = $this->evaluate($var[1], $var[2], $var[3]);
+ } elseif ($var[0] == 'lookup') {
+ // do accessor here....
+ $var = array('number', 0);
+ } elseif ($var[0] == 'function') {
+ $color = $this->funcToColor($var);
+ if ($color) $var = $color;
+ else {
+ list($_, $name, $args) = $var;
+ if ($name == "%") $name = "_sprintf";
+ $f = isset($this->libFunctions[$name]) ?
+ $this->libFunctions[$name] : array($this, 'lib_'.$name);
+
+ if (is_callable($f)) {
+ if ($args[0] == 'list')
+ $args = self::compressList($args[2], $args[1]);
+
+ $var = call_user_func($f, $this->reduce($args), $this);
+
+ // convert to a typed value if the result is a php primitive
+ if (is_numeric($var)) $var = array('number', $var);
+ elseif (!is_array($var)) $var = array('keyword', $var);
+ } else {
+ // plain function, reduce args
+ $var[2] = $this->reduce($var[2]);
+ }
+ }
+ break; // done reducing after a function
+ } elseif ($var[0] == 'negative') {
+ $value = $this->reduce($var[1]);
+ if (is_numeric($value[1])) {
+ $value[1] = -1*$value[1];
+ }
+ $var = $value;
+ }
+ }
+
+ return $var;
+ }
+
+ function coerceColor($value) {
+ switch($value[0]) {
+ case 'color': return $value;
+ case 'keyword':
+ $name = $value[1];
+ if (isset(self::$cssColors[$name])) {
+ list($r, $g, $b) = explode(',', self::$cssColors[$name]);
+ return array('color', $r, $g, $b);
+ }
+ return null;
+ }
+ }
+
+ function toBool($a) {
+ if ($a) return self::$TRUE;
+ else return self::$FALSE;
+ }
+
+ // evaluate an expression
+ function evaluate($op, $left, $right) {
+ $left = $this->reduce($left);
+ $right = $this->reduce($right);
+
+ if ($left_color = $this->coerceColor($left)) {
+ $left = $left_color;
+ }
+
+ if ($right_color = $this->coerceColor($right)) {
+ $right = $right_color;
+ }
+
+ if ($op == "and") {
+ return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
+ }
+
+ if ($op == "=") {
+ return $this->toBool($this->eq($left, $right) );
+ }
+
+ if ($left[0] == 'color' && $right[0] == 'color') {
+ $out = $this->op_color_color($op, $left, $right);
+ return $out;
+ }
+
+ if ($left[0] == 'color') {
+ return $this->op_color_number($op, $left, $right);
+ }
+
+ if ($right[0] == 'color') {
+ return $this->op_number_color($op, $left, $right);
+ }
+
+ // concatenate strings
+ if ($op == '+' && $left[0] == 'string') {
+ $append = $this->compileValue($right);
+ if ($this->quoted($append)) $append = substr($append, 1, -1);
+
+ $lhs = $this->compileValue($left);
+ if ($q = $this->quoted($lhs)) $lhs = substr($lhs, 1, -1);
+ if (!$q) $q = '';
+
+ return array('string', $q.$lhs.$append.$q);
+ }
+
+ if ($left[0] == 'keyword' || $right[0] == 'keyword' ||
+ $left[0] == 'string' || $right[0] == 'string')
+ {
+ // look for negative op
+ if ($op == '-') $right[1] = '-'.$right[1];
+ return array('keyword', $this->compileValue($left) .' '. $this->compileValue($right));
+ }
+
+ // default to number operation
+ return $this->op_number_number($op, $left, $right);
+ }
+
+ // make sure a color's components don't go out of bounds
+ function fixColor($c) {
+ foreach (range(1, 3) as $i) {
+ if ($c[$i] < 0) $c[$i] = 0;
+ if ($c[$i] > 255) $c[$i] = 255;
+ }
+
+ return $c;
+ }
+
+ function op_number_color($op, $lft, $rgt) {
+ if ($op == '+' || $op = '*') {
+ return $this->op_color_number($op, $rgt, $lft);
+ }
+ }
+
+ function op_color_number($op, $lft, $rgt) {
+ if ($rgt[0] == '%') $rgt[1] /= 100;
+
+ return $this->op_color_color($op, $lft,
+ array_fill(1, count($lft) - 1, $rgt[1]));
+ }
+
+ function op_color_color($op, $left, $right) {
+ $out = array('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);
+ }
+
+ // operator on two numbers
+ function op_number_number($op, $left, $right) {
+ $type = is_null($left) ? "number" : $left[0];
+ if ($type == "number") $type = $right[0];
+
+ $value = 0;
+ switch ($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 array($type, $value);
+ }
+
+
+ /* environment functions */
+
+ // used for compiliation variable state
+ function pushEnv() {
+ $e = new stdclass;
+ $e->parent = $this->env;
+
+ $this->store = array();
+
+ $this->env = $e;
+ return $e;
+ }
+
+ // pop something off the stack
+ function pop() {
+ $old = $this->env;
+ $this->env = $this->env->parent;
+ return $old;
+ }
+
+ // set something in the current env
+ function set($name, $value) {
+ $this->env->store[$name] = $value;
+ }
+
+
+ // get the highest occurrence entry for a name
+ function get($name) {
+ $current = $this->env;
+
+ $is_arguments = $name == $this->vPrefix . 'arguments';
+ while ($current) {
+ if ($is_arguments && isset($current->arguments)) {
+ return array('list', ' ', $current->arguments);
+ }
+
+ if (isset($current->store[$name]))
+ return $current->store[$name];
+ else
+ $current = $current->parent;
+ }
+
+ return null;
+ }
+
+ // create a child parser (for compiling an import)
+ protected function createChild($fname) {
+ $less = new lessc($fname);
+ $less->importDir = array_merge((array)$less->importDir, (array)$this->importDir);
+ $less->formatter = $this->formatter;
+ $less->compat = $this->compat;
+ return $less;
+ }
+
+ // inject array of unparsed strings into environment as variables
+ protected function injectVariables($args) {
+ $this->pushEnv();
+ $parser = new lessc_parser($this, __METHOD__);
+ foreach ($args as $name => $str_value) {
+ if ($name{0} != '@') $name = '@'.$name;
+ $parser->count = 0;
+ $parser->buffer = (string)$str_value;
+ if (!$parser->propertyValue($value)) {
+ throw new Exception("failed to parse passed in variable $name: $str_value");
+ }
+
+ $this->set($name, $value);
+ }
+ }
+
+ // parse and compile buffer
+ function parse($str = null, $initialVariables = null) {
+ if (is_array($str)) {
+ $initialVariables = $str;
+ $str = null;
+ }
+
+ $locale = setlocale(LC_NUMERIC, 0);
+ setlocale(LC_NUMERIC, "C");
+
+ $name = null;
+ if (is_null($str)) {
+ if (empty($this->fileName))
+ throw new exception("nothing to parse");
+
+ $name = $this->fileName;
+ $str = file_get_contents($this->fileName);
+ }
+
+ $this->parser = new lessc_parser($this, $name);
+ $root = $this->parser->parse($str);
+
+ $this->formatter = $this->newFormatter();
+
+ if ($initialVariables) $this->injectVariables($initialVariables);
+ $this->indentLevel = -1;
+ $out = $this->compileBlock($root);
+ setlocale(LC_NUMERIC, $locale);
+ return $out;
+ }
+
+ function setFormatter($name) {
+ $this->formatterName = $name;
+ }
+
+ function newFormatter() {
+ $className = "lessc_formatter";
+ if (!empty($this->formatterName)) {
+ if (!is_string($this->formatterName))
+ return $this->formatterName;
+ $className = "lessc_formatter_$this->formatterName";
+ }
+
+ return new $className;
+ }
+
+ /**
+ * Uses the current value of $this->count to show line and line number
+ */
+ function throwError($msg = null) {
+ if ($this->sourceLoc >= 0) {
+ $this->sourceParser->throwError($msg, $this->sourceLoc);
+ }
+ throw new exception($msg);
+ }
+
+ /**
+ * Initialize any static state, can initialize parser for a file
+ * $opts isn't used yet
+ */
+ function __construct($fname = null, $opts = null) {
+ if ($fname) {
+ if (!is_file($fname)) {
+ throw new Exception('load error: failed to find '.$fname);
+ }
+ $pi = pathinfo($fname);
+
+ $this->fileName = $fname;
+ $this->importDir = $pi['dirname'].'/';
+ $this->addParsedFile($fname);
+ }
+ }
+
+ public function registerFunction($name, $func) {
+ $this->libFunctions[$name] = $func;
+ }
+
+ public function unregisterFunction($name) {
+ unset($this->libFunctions[$name]);
+ }
+
+ public function allParsedFiles() { return $this->allParsedFiles; }
+ protected function addParsedFile($file) {
+ $this->allParsedFiles[realpath($file)] = filemtime($file);
+ }
+
+
+ // compile file $in to file $out if $in is newer than $out
+ // returns true when it compiles, false otherwise
+ public static function ccompile($in, $out) {
+ if (!is_file($out) || filemtime($in) > filemtime($out)) {
+ $less = new lessc($in);
+ file_put_contents($out, $less->parse());
+ 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 $force Force rebuild?
+ * @return array lessphp cache structure
+ */
+ public static function cexecute($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 => $ftime ) {
+ if (!file_exists($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 = $in['root'];
+ break;
+ }
+ }
+ }
+ } else {
+ // TODO: Throw an exception? We got neither a string nor something
+ // that looks like a compatible lessphp cache structure.
+ return null;
+ }
+
+ if ($root !== null) {
+ // If we have a root value which means we should rebuild.
+ $less = new lessc($root);
+ $out = array();
+ $out['root'] = $root;
+ $out['compiled'] = $less->parse();
+ $out['files'] = $less->allParsedFiles();
+ $out['updated'] = time();
+ return $out;
+ } else {
+ // No changes, pass back the structure
+ // we were given initially.
+ return $in;
+ }
+
+ }
+
+ static protected $cssColors = array(
+ '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',
+ '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 {
+ static protected $nextBlockId = 0; // used to uniquely identify blocks
+
+ static protected $precedence = array(
+ '=<' => 0,
+ '>=' => 0,
+ '=' => 0,
+ '<' => 0,
+ '>' => 0,
+
+ '+' => 1,
+ '-' => 1,
+ '*' => 2,
+ '/' => 2,
+ '%' => 2,
+ );
+
+ // regex string to match any of the operators
+ static protected $operatorString;
+
+ // these properties will supress division unless it's inside parenthases
+ static protected $supressDivisionProps =
+ array('/border-radius$/i', '/^font$/i');
+
+ /**
+ * @link http://www.w3.org/TR/css3-values/
+ */
+ static protected $units = array(
+ 'em', 'ex', 'px', 'gd', 'rem', 'vw', 'vh', 'vm', 'ch', // Relative length units
+ 'in', 'cm', 'mm', 'pt', 'pc', // Absolute length units
+ '%', // Percentages
+ 'deg', 'grad', 'rad', 'turn', // Angles
+ 'ms', 's', // Times
+ 'Hz', 'kHz', //Frequencies
+ );
+
+ /**
+ * 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
+ */
+ protected $inParens = false;
+
+ function __construct($lessc, $sourceName = null) {
+ // reference to less needed for vPrefix, mPrefix, and parentSelector
+ $this->lessc = $lessc;
+
+ $this->sourceName = $sourceName; // name used for error messages
+
+ if (!self::$operatorString) {
+ self::$operatorString =
+ '('.implode('|', array_map(array('lessc', 'preg_quote'),
+ array_keys(self::$precedence))).')';
+ }
+ }
+
+ function parse($buffer) {
+ $this->count = 0;
+ $this->line = 1;
+
+ $this->env = null; // block stack
+ $this->buffer = $this->removeComments($buffer);
+ $this->pushBlock(null); // root
+
+ // trim whitespace on head
+ if (preg_match('/^\s+/', $this->buffer, $m)) {
+ $this->line += substr_count($m[0], "\n");
+ $this->buffer = ltrim($this->buffer);
+ }
+
+ // parse the entire file
+ $lastCount = $this->count;
+ while (false !== $this->parseChunk());
+
+ if ($this->count != strlen($this->buffer))
+ $this->throwError();
+
+ // TODO report where the block was opened
+ if (!is_null($this->env->parent))
+ throw new exception('parse error: unclosed block');
+
+ $this->env->isRoot = true;
+ 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.
+ */
+ 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(array('assign', $key, $value), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // look for special css blocks
+ if ($this->env->parent == null && $this->literal('@', false)) {
+ $this->count--;
+
+ // a font-face block
+ if ($this->literal('@font-face') && $this->literal('{')) {
+ $b = $this->pushSpecialBlock('@font-face');
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // charset
+ if ($this->literal('@charset') && $this->propertyValue($value) &&
+ $this->end())
+ {
+ $this->append(array('charset', $value), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+
+ // media
+ if ($this->literal('@media') && $this->mediaTypes($types) &&
+ $this->literal('{'))
+ {
+ $b = $this->pushSpecialBlock('@media');
+ $b->media = $types;
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // css animations
+ if ($this->match('(@(-[a-z]+-)?keyframes)', $m) &&
+ $this->propertyValue($value) && $this->literal('{'))
+ {
+ $b = $this->pushSpecialBlock(trim($m[0]));
+ $b->keyframes = $value;
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ if ($this->literal("@page") &&
+ ($this->match('(:(left|right))', $m) || true) &&
+ $this->literal("{"))
+ {
+ $name = "@page";
+ if ($m) $name = $name . " " . $m[1];
+ $this->pushSpecialBlock($name);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ if (isset($this->env->keyframes)) {
+ if ($this->keyframeTags($ktags) && $this->literal('{')) {
+ $this->pushSpecialBlock($ktags);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ // setting a variable
+ if ($this->variable($var) && $this->assign() &&
+ $this->propertyValue($value) && $this->end())
+ {
+ $this->append(array('assign', $var, $value), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ if ($this->import($url, $media)) {
+ $this->append(array('import', $url, $media), $s);
+ return true;
+
+ // don't check .css files
+ if (empty($media) && substr_compare($url, '.css', -4, 4) !== 0) {
+ if ($this->importDisabled) {
+ $this->append(array('raw', '/* import disabled */'));
+ } else {
+ $path = $this->findImport($url);
+ if (!is_null($path)) {
+ $this->append(array('import', $path), $s);
+ return true;
+ }
+ }
+ }
+
+ $this->append(array('raw', '@import url("'.$url.'")'.
+ ($media ? ' '.$media : '').';'), $s);
+ return true;
+ }
+
+ // opening parametric mixin
+ if ($this->tag($tag, true) && $this->argumentDef($args, $is_vararg) &&
+ ($this->guards($guards) || true) &&
+ $this->literal('{'))
+ {
+ $block = $this->pushBlock($this->fixTags(array($tag)));
+ $block->args = $args;
+ $block->is_vararg = $is_vararg;
+ if (!empty($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('}')) {
+ try {
+ $block = $this->pop();
+ } catch (exception $e) {
+ $this->seek($s);
+ $this->throwError($e->getMessage());
+ }
+
+ $hidden = true;
+ if (!isset($block->args)) foreach ($block->tags as $tag) {
+ if (!is_string($tag) || $tag{0} != $this->lessc->mPrefix) {
+ $hidden = false;
+ break;
+ }
+ }
+
+ if (!$hidden) $this->append(array('block', $block), $s);
+
+ foreach ($block->tags as $tag) {
+ if (is_string($tag)) {
+ $this->env->children[$tag][] = $block;
+ }
+ }
+
+ return true;
+ }
+
+ // mixin
+ if ($this->mixinTags($tags) &&
+ ($this->argumentValues($argv) || true) &&
+ ($this->keyword($suffix) || true) && $this->end())
+ {
+ $tags = $this->fixTags($tags);
+ $this->append(array('mixin', $tags, $argv, $suffix), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // spare ;
+ if ($this->literal(';')) return true;
+
+ return false; // got nothing, throw error
+ }
+
+ protected function fixTags($tags) {
+ // move @ tags out of variable namespace
+ foreach ($tags as &$tag) {
+ if ($tag{0} == $this->lessc->vPrefix)
+ $tag[0] = $this->lessc->mPrefix;
+ }
+ return $tags;
+ }
+
+ protected function keyframeTags(&$tags) {
+ $s = $this->seek();
+ $tags = array();
+ while($this->match("(to|from|[0-9]+%)", $m)) {
+ $tags[] = $m[1];
+ if (!$this->literal(",")) break;
+ }
+
+ if (count($tags) == 0) {
+ $this->seek($s);
+ return false;
+ }
+
+ return true;
+ }
+
+ // a list of expressions
+ protected function expressionList(&$exps) {
+ $values = array();
+
+ while ($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
+ */
+ protected function expression(&$out) {
+ $s = $this->seek();
+ if ($this->literal('(') && ($this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
+ $lhs = $exp;
+ } elseif ($this->seek($s) && $this->value($val)) {
+ $lhs = $val;
+ } else {
+ $this->inParens = false;
+ $this->seek($s);
+ return false;
+ }
+
+ $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)) {
+ $out = array("list", "",
+ array($out, array("keyword", "/"), $rhs));
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ $this->inParens = false;
+ return true;
+ }
+
+ /**
+ * recursively parse infix equation with $lhs at precedence $minP
+ */
+ protected function expHelper($lhs, $minP) {
+ $this->inExp = true;
+ $ss = $this->seek();
+
+ // if there was whitespace before the operator, then we require whitespace after
+ // the operator for it to be a mathematical operator.
+
+ $needWhite = false;
+ if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
+ $needWhite = true;
+ }
+
+ // try to find a valid operator
+ while ($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;
+ }
+ }
+ }
+
+ // get rhs
+ $s = $this->seek();
+ $p = $this->inParens;
+ if ($this->literal('(') && ($this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
+ $this->inParens = $p;
+ $rhs = $exp;
+ } else {
+ $this->inParens = $p;
+ if ($this->seek($s) && $this->value($val)) {
+ $rhs = $val;
+ } else {
+ break;
+ }
+ }
+
+ // peek for next operator to see what to do with rhs
+ if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {
+ $rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
+ }
+
+ $lhs = array('expression', $m[1], $lhs, $rhs);
+ $ss = $this->seek();
+
+ $needWhite = false;
+ if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
+ $needWhite = true;
+ }
+ }
+ $this->seek($ss);
+
+ return $lhs;
+ }
+
+ // consume a list of values for a property
+ public function propertyValue(&$value, $keyName=null) {
+ $values = array();
+
+ if (!is_null($keyName)) $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 (!is_null($keyName)) unset($this->env->currentProperty);
+
+ if (count($values) == 0) return false;
+
+ $value = lessc::compressList($values, ', ');
+ return true;
+ }
+
+ // a single value
+ protected function value(&$value) {
+ // try a unit
+ if ($this->unit($value)) return true;
+
+ // see if there is a negation
+ $s = $this->seek();
+ if ($this->literal('-', false)) {
+ $value = null;
+ if ($this->variable($var)) {
+ $value = array('variable', $var);
+ } elseif ($this->buffer{$this->count} == "(" && $this->expression($exp)) {
+ $value = $exp;
+ } else {
+ $this->seek($s);
+ }
+
+ if (!is_null($value)) {
+ $value = array('negative', $value);
+ return true;
+ }
+ } else {
+ $this->seek($s);
+ }
+
+ // accessor
+ // must be done before color
+ // this needs negation too
+ if ($this->accessor($a)) {
+ $a[1] = $this->fixTags($a[1]);
+ $value = $a;
+ return true;
+ }
+
+ // color
+ if ($this->color($value)) return true;
+
+ // css function
+ // must be done after color
+ if ($this->func($value)) return true;
+
+ // string
+ if ($this->string($tmp, $d)) {
+ $value = array('string', $d.$tmp.$d);
+ return true;
+ }
+
+ // try a keyword
+ if ($this->keyword($word)) {
+ $value = array('keyword', $word);
+ return true;
+ }
+
+ // try a variable
+ if ($this->variable($var)) {
+ $value = array('variable', $var);
+ return true;
+ }
+
+ // unquote string
+ if ($this->literal("~") && $this->string($value, $d)) {
+ $value = array("escape", $value);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // css hack: \0
+ if ($this->literal('\\') && $this->match('([0-9]+)', $m)) {
+ $value = array('keyword', '\\'.$m[1]);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ return false;
+ }
+
+ // an import statement
+ protected function import(&$url, &$media) {
+ $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->literal('url(')) $parens = true; else $parens = false;
+
+ if (!$this->string($url)) {
+ if ($parens && $this->to(')', $url)) {
+ $parens = false; // got em
+ } else {
+ $this->seek($s);
+ return false;
+ }
+ }
+
+ if ($parens && !$this->literal(')')) {
+ $this->seek($s);
+ return false;
+ }
+
+ // now the rest is media
+ return $this->to(';', $media, false, true);
+ }
+
+ // a list of media types, very lenient
+ protected function mediaTypes(&$parts) {
+ $parts = array();
+ while ($this->to("(", $chunk, false, "[^{]")) {
+ $parts[] = array('raw', $chunk."(");
+ $s = $this->seek();
+ if ($this->keyword($name) && $this->assign() &&
+ $this->propertyValue($value))
+ {
+ $parts[] = array('assign', $name, $value);
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ if ($this->to('{', $rest, true, true)) {
+ $parts[] = array('raw', $rest);
+ return true;
+ }
+
+ $parts = null;
+ return false;
+ }
+
+ // a scoped value accessor
+ // .hello > @scope1 > @scope2['value'];
+ protected function accessor(&$var) {
+ $s = $this->seek();
+
+ if (!$this->tags($scope, true, '>') || !$this->literal('[')) {
+ $this->seek($s);
+ return false;
+ }
+
+ // either it is a variable or a property
+ // why is a property wrapped in quotes, who knows!
+ if ($this->variable($name)) {
+ // ~
+ } elseif ($this->literal("'") && $this->keyword($name) && $this->literal("'")) {
+ // .. $this->count is messed up if we wanted to test another access type
+ } else {
+ $this->seek($s);
+ return false;
+ }
+
+ if (!$this->literal(']')) {
+ $this->seek($s);
+ return false;
+ }
+
+ $var = array('lookup', $scope, $name);
+ return true;
+ }
+
+ // a string
+ protected function string(&$string, &$d = null) {
+ $s = $this->seek();
+ if ($this->literal('"', false)) {
+ $delim = '"';
+ } elseif ($this->literal("'", false)) {
+ $delim = "'";
+ } else {
+ return false;
+ }
+
+ if (!$this->to($delim, $string)) {
+ $this->seek($s);
+ return false;
+ }
+
+ $d = $delim;
+ return true;
+ }
+
+ /**
+ * Consume a number and optionally a unit.
+ * Can also consume a font shorthand if it is a simple case.
+ * $allowed restricts the types that are matched.
+ */
+ protected function unit(&$unit, $allowed = null) {
+ if (!$allowed) $allowed = self::$units;
+
+ if ($this->match('(-?[0-9]*(\.)?[0-9]+)('.implode('|', $allowed).')?', $m)) {
+ if (!isset($m[3])) $m[3] = 'number';
+ $unit = array($m[3], $m[1]);
+
+ return true;
+ }
+
+ return false;
+ }
+
+ // a # color
+ protected function color(&$out) {
+ $color = array('color');
+
+ if ($this->match('(#([0-9a-f]{6})|#([0-9a-f]{3}))', $m)) {
+ if (isset($m[3])) {
+ $num = $m[3];
+ $width = 16;
+ } else {
+ $num = $m[2];
+ $width = 256;
+ }
+
+ $num = hexdec($num);
+ foreach (array(3,2,1) as $i) {
+ $t = $num % $width;
+ $num /= $width;
+
+ $color[$i] = $t * (256/$width) + $t * floor(16/$width);
+ }
+
+ $out = $color;
+ return true;
+ }
+
+ return false;
+ }
+
+ // consume a list of property values delimited by ; and wrapped in ()
+ protected function argumentValues(&$args, $delim = ',') {
+ $s = $this->seek();
+ if (!$this->literal('(')) return false;
+
+ $values = array();
+ while (true) {
+ if ($this->expressionList($value)) $values[] = $value;
+ if (!$this->literal($delim)) break;
+ else {
+ if ($value == null) $values[] = null;
+ $value = null;
+ }
+ }
+
+ if (!$this->literal(')')) {
+ $this->seek($s);
+ return false;
+ }
+
+ $args = $values;
+ return true;
+ }
+
+ // consume an argument definition list surrounded by ()
+ // each argument is a variable name with optional value
+ // or at the end a ... or a variable named followed by ...
+ protected function argumentDef(&$args, &$is_vararg, $delim = ',') {
+ $s = $this->seek();
+ if (!$this->literal('(')) return false;
+
+ $values = array();
+
+ $is_vararg = false;
+ while (true) {
+ if ($this->literal("...")) {
+ $is_vararg = true;
+ break;
+ }
+
+ if ($this->variable($vname)) {
+ $arg = array("arg", $vname);
+ $ss = $this->seek();
+ if ($this->assign() && $this->expressionList($value)) {
+ $arg[] = $value;
+ } else {
+ $this->seek($ss);
+ if ($this->literal("...")) {
+ $arg[0] = "rest";
+ $is_vararg = true;
+ }
+ }
+ $values[] = $arg;
+ if ($is_vararg) break;
+ continue;
+ }
+
+ if ($this->value($literal)) {
+ $values[] = array("lit", $literal);
+ }
+
+ if (!$this->literal($delim)) break;
+ }
+
+ if (!$this->literal(')')) {
+ $this->seek($s);
+ return false;
+ }
+
+ $args = $values;
+
+ return true;
+ }
+
+ // consume a list of tags
+ // this accepts a hanging delimiter
+ protected function tags(&$tags, $simple = false, $delim = ',') {
+ $tags = array();
+ while ($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 >)
+ function mixinTags(&$tags) {
+ $s = $this->seek();
+ $tags = array();
+ while ($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)
+ protected function tagBracket(&$value) {
+ $s = $this->seek();
+ if ($this->literal('[') && $this->to(']', $c, true) && $this->literal(']', false)) {
+ $value = '['.$c.']';
+ // whitespace?
+ if ($this->match('', $_)) $value .= $_[0];
+
+ // escape parent selector, (yuck)
+ $value = str_replace($this->lessc->parentSelector, "$&$", $value);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ protected function tagExpression(&$value) {
+ $s = $this->seek();
+ if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
+ $value = array('exp', $exp);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ // a single tag
+ protected function tag(&$tag, $simple = false) {
+ if ($simple)
+ $chars = '^,:;{}\][>\(\) "\'';
+ else
+ $chars = '^,;{}["\'';
+
+ if (!$simple && $this->tagExpression($tag)) {
+ return true;
+ }
+
+ $tag = '';
+ while ($this->tagBracket($first)) $tag .= $first;
+ while ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
+ $tag .= $m[1];
+ if ($simple) break;
+
+ while ($this->tagBracket($brack)) $tag .= $brack;
+ }
+ $tag = trim($tag);
+ if ($tag == '') return false;
+
+ return true;
+ }
+
+ // a css function
+ protected function func(&$func) {
+ $s = $this->seek();
+
+ if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
+ $fname = $m[1];
+
+ $s_pre_args = $this->seek();
+
+ $args = array();
+ while (true) {
+ $ss = $this->seek();
+ // this ugly nonsense is for ie filter properties
+ if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
+ $args[] = array('list', '=', array(array('keyword', $name), $value));
+ } else {
+ $this->seek($ss);
+ if ($this->expressionList($value)) {
+ $args[] = $value;
+ }
+ }
+
+ if (!$this->literal(',')) break;
+ }
+ $args = array('list', ',', $args);
+
+ if ($this->literal(')')) {
+ $func = array('function', $fname, $args);
+ return true;
+ } elseif ($fname == 'url') {
+ // couldn't parse and in url? treat as string
+ $this->seek($s_pre_args);
+ if ($this->to(')', $content, true) && $this->literal(')')) {
+ $func = array('function', $fname,array('string', $content));
+ return true;
+ }
+ }
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ // consume a less variable
+ protected function variable(&$name) {
+ $s = $this->seek();
+ if ($this->literal($this->lessc->vPrefix, false) &&
+ ($this->variable($sub) || $this->keyword($name)))
+ {
+ if (!empty($sub)) {
+ $name = array('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
+ */
+ protected function assign($name = null) {
+ if ($name) $this->currentProperty = $name;
+ return $this->literal(':') || $this->literal('=');
+ }
+
+ // consume a keyword
+ protected function keyword(&$word) {
+ if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m)) {
+ $word = $m[1];
+ return true;
+ }
+ return false;
+ }
+
+ // consume an end of statement delimiter
+ protected function end() {
+ if ($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;
+ }
+
+ protected function guards(&$guards) {
+ $s = $this->seek();
+
+ if (!$this->literal("when")) {
+ $this->seek($s);
+ return false;
+ }
+
+ $guards = array();
+
+ while ($this->guard_group($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
+ protected function guard_group(&$guard_group) {
+ $s = $this->seek();
+ $guard_group = array();
+ while ($this->guard($guard)) {
+ $guard_group[] = $guard;
+ if (!$this->literal("and")) break;
+ }
+
+ if (count($guard_group) == 0) {
+ $guard_group = null;
+ $this->seek($s);
+ return false;
+ }
+
+ return true;
+ }
+
+ protected function guard(&$guard) {
+ $s = $this->seek();
+ $negate = $this->literal("not");
+
+ if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
+ $guard = $exp;
+ if ($negate) $guard = array("negate", $guard);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ /* raw parsing functions */
+
+ protected function literal($what, $eatWhitespace = true) {
+ // this is here mainly prevent notice from { } string accessor
+ if ($this->count >= strlen($this->buffer)) return false;
+
+ // shortcut on single letter
+ if (!$eatWhitespace && strlen($what) == 1) {
+ if ($this->buffer{$this->count} == $what) {
+ $this->count++;
+ return true;
+ }
+ else return false;
+ }
+
+ return $this->match(lessc::preg_quote($what), $m, $eatWhitespace);
+ }
+
+
+ // advance counter to next occurrence of $what
+ // $until - don't include $what in advance
+ // $allowNewline, if string, will be used as valid char set
+ protected function to($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 = $m[1];
+ return true;
+ }
+
+ // try to match something on head of buffer
+ protected function match($regex, &$out, $eatWhitespace = true) {
+ $r = '/'.$regex.($eatWhitespace ? '\s*' : '').'/Ais';
+ if (preg_match($r, $this->buffer, $out, null, $this->count)) {
+ $this->count += strlen($out[0]);
+ return true;
+ }
+ return false;
+ }
+
+ // match something without consuming it
+ 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 $result;
+ }
+
+ // seek to a spot in the buffer or return where we are on no argument
+ protected function seek($where = null) {
+ if ($where === null) return $this->count;
+ else $this->count = $where;
+ return true;
+ }
+
+ /* misc functions */
+
+ public function throwError($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: $loc");
+ }
+ }
+
+ protected function pushBlock($tags) {
+ $b = new stdclass;
+ $b->parent = $this->env;
+
+ $b->id = self::$nextBlockId++;
+ $b->is_vararg = false;
+ $b->tags = $tags;
+ $b->props = array();
+ $b->children = array();
+
+ $this->env = $b;
+ return $b;
+ }
+
+ // push a block that doesn't multiply tags
+ protected function pushSpecialBlock($name) {
+ $b = $this->pushBlock(array($name));
+ $b->no_multiply = true;
+ return $b;
+ }
+
+ // append a property to the current block
+ function append($prop, $pos = null) {
+ if (!is_null($pos)) $prop[-1] = $pos;
+ $this->env->props[] = $prop;
+ }
+
+ // pop something off the stack
+ function pop() {
+ $old = $this->env;
+ $this->env = $this->env->parent;
+ return $old;
+ }
+
+ // remove comments from $text
+ // todo: make it work for all functions, not just url
+ protected function removeComments($text) {
+ $look = array(
+ 'url(', '//', '/*', '"', "'"
+ );
+
+ $out = '';
+ $min = null;
+ $done = false;
+ while (true) {
+ // find the next item
+ foreach ($look as $token) {
+ $pos = strpos($text, $token);
+ if ($pos !== false) {
+ if (!isset($min) || $pos < $min[1]) $min = array($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 {
+ public $indentChar = " ";
+
+ public $break = "\n";
+ public $open = " {";
+ public $close = "}";
+ public $tagSeparator = ", ";
+
+ public $disableSingle = false;
+ public $openSingle = " { ";
+ public $closeSingle = " }";
+
+ // returns the amount of indent that should happen for a block
+ function indentAmount($block) {
+ return isset($block->isRoot) || !empty($block->no_multiply) ? 1 : 0;
+ }
+
+ // an $indentLevel of -1 signifies the root level
+ function block($tags, $wrapChildren, $lines, $children, $indentLevel) {
+ $indent = str_repeat($this->indentChar, max($indentLevel, 0));
+
+ // what $lines is imploded by
+ $nl = $indentLevel == -1 ? $this->break :
+ $this->break.$indent.$this->indentChar;
+
+ ob_start();
+
+ $isSingle = !$this->disableSingle && !$wrapChildren
+ && count($lines) <= 1;
+
+ $showDelim = !empty($tags) && (count($lines) > 0 || $wrapChildren);
+
+ if ($showDelim) {
+ if (is_array($tags)) {
+ $tags = implode($this->tagSeparator, $tags);
+ }
+
+ echo $indent.$tags;
+ if ($isSingle) echo $this->openSingle;
+ else {
+ echo $this->open;
+ if (!empty($lines)) echo $nl;
+ else echo $this->break;
+ }
+ }
+
+ echo implode($nl, $lines);
+
+ if ($wrapChildren) {
+ if (!empty($lines)) echo $this->break;
+ foreach ($children as $child) echo $child;
+ }
+
+ if ($showDelim) {
+ if ($isSingle) echo $this->closeSingle;
+ else {
+ if (!$wrapChildren) echo $this->break;
+ echo $indent.$this->close;
+ }
+ echo $this->break;
+ } elseif (!empty($lines)) {
+ echo $this->break;
+ }
+
+ if (!$wrapChildren)
+ foreach ($children as $child) echo $child;
+
+ return ob_get_clean();
+ }
+
+ function property($name, $values) {
+ return "";
+ }
+}
+
+class lessc_formatter_compressed extends lessc_formatter {
+ public $indentChar = "";
+
+ public $break = "";
+ public $open = "{";
+ public $close = "}";
+ public $tagSeparator = ",";
+ public $disableSingle = true;
+}
+
+class lessc_formatter_indent extends lessc_formatter {
+ function indentAmount($block) {
+ if (isset($block->isRoot)) return 1;
+ $numLines = 0;
+ foreach ($block->props as $prop) {
+ $t = $prop[0];
+ if ($t != 'block' && $t != 'mixin') {
+ $numLines++;
+ }
+ }
+ return $numLines > 0 ? 1 : 0;
+ }
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 15:46:55 +0000