From 551497ef94f6239b109316d8fab32f0909b13f73 Mon Sep 17 00:00:00 2001 From: Silvio Rhatto Date: Sat, 15 Mar 2014 14:42:42 -0300 Subject: Squashed 'mod/less/' content from commit 380edad git-subtree-dir: mod/less git-subtree-split: 380edadb3a5e524a8e6ef6df063b678f2f00516f --- vendors/lessphp/lessc.inc.php | 2910 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 2910 insertions(+) create mode 100644 vendors/lessphp/lessc.inc.php (limited to 'vendors/lessphp/lessc.inc.php') diff --git a/vendors/lessphp/lessc.inc.php b/vendors/lessphp/lessc.inc.php new file mode 100644 index 000000000..d710fdf8a --- /dev/null +++ b/vendors/lessphp/lessc.inc.php @@ -0,0 +1,2910 @@ + + * 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; + } +} + -- cgit v1.2.3