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Current File : /WEBS/sic/wp-content/plugins/smart-slider-3/Nextend/Framework/Asset/Css/Less//LessCompiler.php
<?php

namespace Nextend\Framework\Asset\Css\Less;

use Exception;
use Nextend\Framework\Asset\Css\Less\Formatter\Classic;
use Nextend\Framework\Asset\Css\Less\Formatter\Compressed;
use Nextend\Framework\Asset\Css\Less\Formatter\Debug;
use Nextend\Framework\Filesystem\Filesystem;
use stdClass;

/**
 * The less compiler and parser.
 *
 * Converting LESS to CSS is a three stage process. The incoming file is parsed
 * by `lessc_parser` into a syntax tree, then it is compiled into another tree
 * representing the CSS structure by `lessc`. The CSS tree is fed into a
 * formatter, like `lessc_formatter` which then outputs CSS as a string.
 *
 * During the first compile, all values are *reduced*, which means that their
 * types are brought to the lowest form before being dump as strings. This
 * handles math equations, variable dereferences, and the like.
 *
 * The `parse` function of `lessc` is the entry point.
 *
 * In summary:
 *
 * The `lessc` class creates an intstance of the parser, feeds it LESS code,
 * then transforms the resulting tree to a CSS tree. This class also holds the
 * evaluation context, such as all available mixins and variables at any given
 * time.
 *
 * The `lessc_parser` class is only concerned with parsing its input.
 *
 * The `lessc_formatter` takes a CSS tree, and dumps it to a formatted string,
 * handling things like indentation.
 */
#[\AllowDynamicProperties]
class LessCompiler {

    static public $VERSION = "v0.3.8";
    static protected $TRUE = array(
        "keyword",
        "true"
    );
    static protected $FALSE = array(
        "keyword",
        "false"
    );

    protected $libFunctions = array();
    protected $registeredVars = array();
    protected $preserveComments = false;

    public $vPrefix = '@'; // prefix of abstract properties
    public $mPrefix = '$'; // prefix of abstract blocks
    public $parentSelector = '&';

    public $importDisabled = false;
    public $importDir = '';

    protected $numberPrecision = null;

    // set to the parser that generated the current line when compiling
    // so we know how to create error messages
    public $sourceParser = null;
    protected $sourceLoc = null;

    static public $defaultValue = array(
        "keyword",
        ""
    );

    static protected $nextImportId = 0; // uniquely identify imports

    // attempts to find the path of an import url, returns null for css files
    protected function findImport($url) {
        foreach ((array)$this->importDir as $dir) {
            $full = $dir . (substr($dir, -1) != '/' ? '/' : '') . $url;
            if ($this->fileExists($file = $full . '.n2less') || $this->fileExists($file = $full)) {
                return $file;
            }
        }

        return null;
    }

    protected function fileExists($name) {
        return @is_file($name);
    }

    static public function compressList($items, $delim) {
        if (!isset($items[1]) && isset($items[0])) return $items[0]; else return array(
            'list',
            $delim,
            $items
        );
    }

    static public function preg_quote($what) {
        return preg_quote($what, '/');
    }

    protected function tryImport($importPath, $parentBlock, $out) {
        if ($importPath[0] == "function" && $importPath[1] == "url") {
            $importPath = $this->flattenList($importPath[2]);
        }

        $str = $this->coerceString($importPath);
        if ($str === null) return false;

        $url = $this->compileValue($this->lib_e($str));

        if (isset($this->registeredVars[$url])) {
            $url = $this->registeredVars[$url];
        }

        // don't import if it ends in css
        if (strlen($url) >= 4 && substr_compare($url, '.css', -4, 4) === 0) return false;

        $realPath = $this->findImport($url);
        if ($realPath === null) return false;

        if ($this->importDisabled) {
            return array(
                false,
                "/* import disabled */"
            );
        }

        $this->addParsedFile($realPath);
        $parser = $this->makeParser($realPath);
        $root   = $parser->parse(file_get_contents($realPath));

        // set the parents of all the block props
        foreach ($root->props as $prop) {
            if ($prop[0] == "block") {
                $prop[1]->parent = $parentBlock;
            }
        }

        // copy mixins into scope, set their parents
        // bring blocks from import into current block
        // TODO: need to mark the source parser	these came from this file
        foreach ($root->children as $childName => $child) {
            if (isset($parentBlock->children[$childName])) {
                $parentBlock->children[$childName] = array_merge($parentBlock->children[$childName], $child);
            } else {
                $parentBlock->children[$childName] = $child;
            }
        }

        $pi  = pathinfo($realPath);
        $dir = $pi["dirname"];

        list($top, $bottom) = $this->sortProps($root->props, true);
        $this->compileImportedProps($top, $parentBlock, $out, $parser, $dir);

        return array(
            true,
            $bottom,
            $parser,
            $dir
        );
    }

    protected function compileImportedProps($props, $block, $out, $sourceParser, $importDir) {
        $oldSourceParser = $this->sourceParser;

        $oldImport = $this->importDir;

        // TODO: this is because the importDir api is stupid
        $this->importDir = (array)$this->importDir;
        array_unshift($this->importDir, $importDir);

        foreach ($props as $prop) {
            $this->compileProp($prop, $block, $out);
        }

        $this->importDir    = $oldImport;
        $this->sourceParser = $oldSourceParser;
    }

    /**
     * Recursively compiles a block.
     *
     * A block is analogous to a CSS block in most cases. A single LESS document
     * is encapsulated in a block when parsed, but it does not have parent tags
     * so all of it's children appear on the root level when compiled.
     *
     * Blocks are made up of props and children.
     *
     * Props are property instructions, array tuples which describe an action
     * to be taken, eg. write a property, set a variable, mixin a block.
     *
     * The children of a block are just all the blocks that are defined within.
     * This is used to look up mixins when performing a mixin.
     *
     * Compiling the block involves pushing a fresh environment on the stack,
     * and iterating through the props, compiling each one.
     *
     * See lessc::compileProp()
     *
     */
    protected function compileBlock($block) {
        switch ($block->type) {
            case "root":
                $this->compileRoot($block);
                break;
            case null:
                $this->compileCSSBlock($block);
                break;
            case "media":
                $this->compileMedia($block);
                break;
            case "directive":
                $name = "@" . $block->name;
                if (!empty($block->value)) {
                    $name .= " " . $this->compileValue($this->reduce($block->value));
                }

                $this->compileNestedBlock($block, array($name));
                break;
            default:
                $this->throwError("unknown block type: $block->type\n");
        }
    }

    protected function compileCSSBlock($block) {
        $env = $this->pushEnv();

        $selectors      = $this->compileSelectors($block->tags);
        $env->selectors = $this->multiplySelectors($selectors);
        $out            = $this->makeOutputBlock(null, $env->selectors);

        $this->scope->children[] = $out;
        $this->compileProps($block, $out);

        $block->scope = $env; // mixins carry scope with them!
        $this->popEnv();
    }

    protected function compileMedia($media) {
        $env         = $this->pushEnv($media);
        $parentScope = $this->mediaParent($this->scope);

        $query = $this->compileMediaQuery($this->multiplyMedia($env));

        $this->scope             = $this->makeOutputBlock($media->type, array($query));
        $parentScope->children[] = $this->scope;

        $this->compileProps($media, $this->scope);

        if (count($this->scope->lines) > 0) {
            $orphanSelelectors = $this->findClosestSelectors();
            if (!is_null($orphanSelelectors)) {
                $orphan        = $this->makeOutputBlock(null, $orphanSelelectors);
                $orphan->lines = $this->scope->lines;
                array_unshift($this->scope->children, $orphan);
                $this->scope->lines = array();
            }
        }

        $this->scope = $this->scope->parent;
        $this->popEnv();
    }

    protected function mediaParent($scope) {
        while (!empty($scope->parent)) {
            if (!empty($scope->type) && $scope->type != "media") {
                break;
            }
            $scope = $scope->parent;
        }

        return $scope;
    }

    protected function compileNestedBlock($block, $selectors) {
        $this->pushEnv($block);
        $this->scope                     = $this->makeOutputBlock($block->type, $selectors);
        $this->scope->parent->children[] = $this->scope;

        $this->compileProps($block, $this->scope);

        $this->scope = $this->scope->parent;
        $this->popEnv();
    }

    protected function compileRoot($root) {
        $this->pushEnv();
        $this->scope = $this->makeOutputBlock($root->type);
        $this->compileProps($root, $this->scope);
        $this->popEnv();
    }

    protected function compileProps($block, $out) {
        foreach ($this->sortProps($block->props) as $prop) {
            $this->compileProp($prop, $block, $out);
        }
    }

    protected function sortProps($props, $split = false) {
        $vars    = array();
        $imports = array();
        $other   = array();

        foreach ($props as $prop) {
            switch ($prop[0]) {
                case "assign":
                    if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix) {
                        $vars[] = $prop;
                    } else {
                        $other[] = $prop;
                    }
                    break;
                case "import":
                    $id        = self::$nextImportId++;
                    $prop[]    = $id;
                    $imports[] = $prop;
                    $other[]   = array(
                        "import_mixin",
                        $id
                    );
                    break;
                default:
                    $other[] = $prop;
            }
        }

        if ($split) {
            return array(
                array_merge($vars, $imports),
                $other
            );
        } else {
            return array_merge($vars, $imports, $other);
        }
    }

    protected function compileMediaQuery($queries) {
        $compiledQueries = array();
        foreach ($queries as $query) {
            $parts = array();
            foreach ($query as $q) {
                switch ($q[0]) {
                    case "mediaType":
                        $parts[] = implode(" ", array_slice($q, 1));
                        break;
                    case "mediaExp":
                        if (isset($q[2])) {
                            $parts[] = "($q[1]: " . $this->compileValue($this->reduce($q[2])) . ")";
                        } else {
                            $parts[] = "($q[1])";
                        }
                        break;
                    case "variable":
                        $parts[] = $this->compileValue($this->reduce($q));
                        break;
                }
            }

            if (count($parts) > 0) {
                $compiledQueries[] = implode(" and ", $parts);
            }
        }

        $out = "@media";
        if (!empty($parts)) {
            $out .= " " . implode($this->formatter->selectorSeparator, $compiledQueries);
        }

        return $out;
    }

    protected function multiplyMedia($env, $childQueries = null) {
        if (is_null($env) || !empty($env->block->type) && $env->block->type != "media") {
            return $childQueries;
        }

        // plain old block, skip
        if (empty($env->block->type)) {
            return $this->multiplyMedia($env->parent, $childQueries);
        }

        $out     = array();
        $queries = $env->block->queries;
        if (is_null($childQueries)) {
            $out = $queries;
        } else {
            foreach ($queries as $parent) {
                foreach ($childQueries as $child) {
                    $out[] = array_merge($parent, $child);
                }
            }
        }

        return $this->multiplyMedia($env->parent, $out);
    }

    protected function expandParentSelectors(&$tag, $replace) {
        $parts = explode("$&$", $tag);
        $count = 0;
        foreach ($parts as &$part) {
            $part  = str_replace($this->parentSelector, $replace, $part, $c);
            $count += $c;
        }
        $tag = implode($this->parentSelector, $parts);

        return $count;
    }

    protected function findClosestSelectors() {
        $env       = $this->env;
        $selectors = null;
        while ($env !== null) {
            if (isset($env->selectors)) {
                $selectors = $env->selectors;
                break;
            }
            $env = $env->parent;
        }

        return $selectors;
    }


    // multiply $selectors against the nearest selectors in env
    protected function multiplySelectors($selectors) {
        // find parent selectors

        $parentSelectors = $this->findClosestSelectors();
        if (is_null($parentSelectors)) {
            // kill parent reference in top level selector
            foreach ($selectors as &$s) {
                $this->expandParentSelectors($s, "");
            }

            return $selectors;
        }

        $out = array();
        foreach ($parentSelectors as $parent) {
            foreach ($selectors as $child) {
                $count = $this->expandParentSelectors($child, $parent);

                // don't prepend the parent tag if & was used
                if ($count > 0) {
                    $out[] = trim($child);
                } else {
                    $out[] = trim($parent . ' ' . $child);
                }
            }
        }

        return $out;
    }

    // reduces selector expressions
    protected function compileSelectors($selectors) {
        $out = array();

        foreach ($selectors as $s) {
            if (is_array($s)) {
                list(, $value) = $s;
                $out[] = trim($this->compileValue($this->reduce($value)));
            } else {
                $out[] = $s;
            }
        }

        return $out;
    }

    protected function eq($left, $right) {
        return $left == $right;
    }

    protected function patternMatch($block, $callingArgs) {
        // match the guards if it has them
        // any one of the groups must have all its guards pass for a match
        if (!empty($block->guards)) {
            $groupPassed = false;
            foreach ($block->guards as $guardGroup) {
                foreach ($guardGroup 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->popEnv();

                    if ($passed) {
                        $groupPassed = true;
                    } else {
                        $groupPassed = false;
                        break;
                    }
                }

                if ($groupPassed) break;
            }

            if (!$groupPassed) {
                return false;
            }
        }

        $numCalling = count($callingArgs);

        if (empty($block->args)) {
            return $block->isVararg || $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->isVararg) {
            return true; // not having enough is handled above
        } else {
            $numMatched = $i + 1;

            // greater than becuase default values always match
            return $numMatched >= $numCalling;
        }
    }

    protected 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
    protected function findBlocks($searchIn, $path, $args, $seen = array()) {
        if ($searchIn == null) return null;
        if (isset($seen[$searchIn->id])) return null;
        $seen[$searchIn->id] = true;

        $name = $path[0];

        if (isset($searchIn->children[$name])) {
            $blocks = $searchIn->children[$name];
            if (count($path) == 1) {
                $matches = $this->patternMatchAll($blocks, $args);
                if (!empty($matches)) {
                    // This will return all blocks that match in the closest
                    // scope that has any matching block, like lessjs
                    return $matches;
                }
            } else {
                $matches = array();
                foreach ($blocks as $subBlock) {
                    $subMatches = $this->findBlocks($subBlock, array_slice($path, 1), $args, $seen);

                    if (!is_null($subMatches)) {
                        foreach ($subMatches as $sm) {
                            $matches[] = $sm;
                        }
                    }
                }

                return count($matches) > 0 ? $matches : null;
            }
        }

        if ($searchIn->parent === $searchIn) return null;

        return $this->findBlocks($searchIn->parent, $path, $args, $seen);
    }

    // sets all argument names in $args to either the default value
    // or the one passed in through $values
    protected function zipSetArgs($args, $values) {
        $i              = 0;
        $assignedValues = array();
        foreach ($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);
                $assignedValues[] = $value;
            }
            $i++;
        }

        // check for a rest
        $last = end($args);
        if (!empty($last) && $last[0] == "rest") {
            $rest = array_slice($values, count($args) - 1);
            $this->set($last[1], $this->reduce(array(
                "list",
                " ",
                $rest
            )));
        }

        $this->env->arguments = $assignedValues;
    }

    // compile a prop and update $lines or $blocks appropriately
    protected function compileProp($prop, $block, $out) {
        // set error position context
        $this->sourceLoc = isset($prop[-1]) ? $prop[-1] : -1;

        switch ($prop[0]) {
            case 'assign':
                list(, $name, $value) = $prop;
                if ($name[0] == $this->vPrefix) {
                    $this->set($name, $value);
                } else {
                    $out->lines[] = $this->formatter->property($name, $this->compileValue($this->reduce($value)));
                }
                break;
            case 'block':
                list(, $child) = $prop;
                $this->compileBlock($child);
                break;
            case 'mixin':
                list(, $path, $args, $suffix) = $prop;

                $args   = array_map(array(
                    $this,
                    "reduce"
                ), (array)$args);
                $mixins = $this->findBlocks($block, $path, $args);

                if ($mixins === null) {
                    // fwrite(STDERR,"failed to find block: ".implode(" > ", $path)."\n");
                    break; // throw error here??
                }

                foreach ($mixins as $mixin) {
                    $haveScope = false;
                    if (isset($mixin->parent->scope)) {
                        $haveScope                   = true;
                        $mixinParentEnv              = $this->pushEnv();
                        $mixinParentEnv->storeParent = $mixin->parent->scope;
                    }

                    $haveArgs = false;
                    if (isset($mixin->args)) {
                        $haveArgs = true;
                        $this->pushEnv();
                        $this->zipSetArgs($mixin->args, $args);
                    }

                    $oldParent = $mixin->parent;
                    if ($mixin != $block) $mixin->parent = $block;

                    foreach ($this->sortProps($mixin->props) as $subProp) {
                        if ($suffix !== null && $subProp[0] == "assign" && is_string($subProp[1]) && $subProp[1][0] != $this->vPrefix) {
                            $subProp[2] = array(
                                'list',
                                ' ',
                                array(
                                    $subProp[2],
                                    array(
                                        'keyword',
                                        $suffix
                                    )
                                )
                            );
                        }

                        $this->compileProp($subProp, $mixin, $out);
                    }

                    $mixin->parent = $oldParent;

                    if ($haveArgs) $this->popEnv();
                    if ($haveScope) $this->popEnv();
                }

                break;
            case 'raw':
                $out->lines[] = $prop[1];
                break;
            case "directive":
                list(, $name, $value) = $prop;
                $out->lines[] = "@$name " . $this->compileValue($this->reduce($value)) . ';';
                break;
            case "comment":
                $out->lines[] = $prop[1];
                break;
            case "import";
                list(, $importPath, $importId) = $prop;
                $importPath = $this->reduce($importPath);

                if (!isset($this->env->imports)) {
                    $this->env->imports = array();
                }

                $result = $this->tryImport($importPath, $block, $out);

                $this->env->imports[$importId] = $result === false ? array(
                    false,
                    "@import " . $this->compileValue($importPath) . ";"
                ) : $result;

                break;
            case "import_mixin":
                list(, $importId) = $prop;
                $import = $this->env->imports[$importId];
                if ($import[0] === false) {
                    $out->lines[] = $import[1];
                } else {
                    list(, $bottom, $parser, $importDir) = $import;
                    $this->compileImportedProps($bottom, $block, $out, $parser, $importDir);
                }

                break;
            default:
                $this->throwError("unknown op: {$prop[0]}\n");
        }
    }


    /**
     * Compiles a primitive value into a CSS property value.
     *
     * Values in lessphp are typed by being wrapped in arrays, their format is
     * typically:
     *
     *     array(type, contents [, additional_contents]*)
     *
     * The input is expected to be reduced. This function will not work on
     * things like expressions and variables.
     */
    protected function compileValue($value) {
        switch ($value[0]) {
            case 'list':
                // [1] - delimiter
                // [2] - array of values
                return implode($value[1], array_map(array(
                    $this,
                    'compileValue'
                ), $value[2]));
            case 'raw_color':
                if (!empty($this->formatter->compressColors)) {
                    return $this->compileValue($this->coerceColor($value));
                }

                return $value[1];
            case 'keyword':
                // [1] - the keyword
                return $value[1];
            case 'number':
                list(, $num, $unit) = $value;
                // [1] - the number
                // [2] - the unit
                if ($this->numberPrecision !== null) {
                    $num = round($num, $this->numberPrecision);
                }

                return $num . $unit;
            case 'string':
                // [1] - contents of string (includes quotes)
                list(, $delim, $content) = $value;
                foreach ($content as &$part) {
                    if (is_array($part)) {
                        $part = $this->compileValue($part);
                    }
                }

                return $delim . implode($content) . $delim;
            case 'color':
                // [1] - red component (either number or a %)
                // [2] - green component
                // [3] - blue component
                // [4] - optional alpha component
                list(, $r, $g, $b) = $value;
                $r = round($r);
                $g = round($g);
                $b = round($b);

                if (count($value) == 5 && $value[4] != 1) { // rgba
                    return 'rgba(' . $r . ',' . $g . ',' . $b . ',' . $value[4] . ')';
                }

                $h = sprintf("#%02x%02x%02x", $r, $g, $b);

                if (!empty($this->formatter->compressColors)) {
                    // Converting hex color to short notation (e.g. #003399 to #039)
                    if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
                        $h = '#' . $h[1] . $h[3] . $h[5];
                    }
                }

                return $h;

            case 'function':
                list(, $name, $args) = $value;

                return $name . '(' . $this->compileValue($args) . ')';
            default: // assumed to be unit
                $this->throwError("unknown value type: $value[0]");
        }
    }

    protected function lib_isnumber($value) {
        return $this->toBool($value[0] == "number");
    }

    protected function lib_isstring($value) {
        return $this->toBool($value[0] == "string");
    }

    protected function lib_iscolor($value) {
        return $this->toBool($this->coerceColor($value));
    }

    protected function lib_iskeyword($value) {
        return $this->toBool($value[0] == "keyword");
    }

    protected function lib_ispixel($value) {
        return $this->toBool($value[0] == "number" && $value[2] == "px");
    }

    protected function lib_ispercentage($value) {
        return $this->toBool($value[0] == "number" && $value[2] == "%");
    }

    protected function lib_isem($value) {
        return $this->toBool($value[0] == "number" && $value[2] == "em");
    }

    protected function lib_isrem($value) {
        return $this->toBool($value[0] == "number" && $value[2] == "rem");
    }

    protected function lib_rgbahex($color) {
        $color = $this->coerceColor($color);
        if (is_null($color)) $this->throwError("color expected for rgbahex");

        return sprintf("#%02x%02x%02x%02x", isset($color[4]) ? $color[4] * 255 : 255, $color[1], $color[2], $color[3]);
    }

    protected function lib_argb($color) {
        return $this->lib_rgbahex($color);
    }

    // utility func to unquote a string
    protected function lib_e($arg) {
        switch ($arg[0]) {
            case "list":
                $items = $arg[2];
                if (isset($items[0])) {
                    return $this->lib_e($items[0]);
                }

                return self::$defaultValue;
            case "string":
                $arg[1] = "";

                return $arg;
            case "keyword":
                return $arg;
            default:
                return array(
                    "keyword",
                    $this->compileValue($arg)
                );
        }
    }

    protected function lib__sprintf($args) {
        if ($args[0] != "list") return $args;
        $values   = $args[2];
        $string   = array_shift($values);
        $template = $this->compileValue($this->lib_e($string));

        $i = 0;
        if (preg_match_all('/%[dsa]/', $template, $m)) {
            foreach ($m[0] as $match) {
                $val = isset($values[$i]) ? $this->reduce($values[$i]) : array(
                    'keyword',
                    ''
                );

                // lessjs compat, renders fully expanded color, not raw color
                if ($color = $this->coerceColor($val)) {
                    $val = $color;
                }

                $i++;
                $rep      = $this->compileValue($this->lib_e($val));
                $template = preg_replace('/' . self::preg_quote($match) . '/', $rep, $template, 1);
            }
        }

        $d = $string[0] == "string" ? $string[1] : '"';

        return array(
            "string",
            $d,
            array($template)
        );
    }

    protected function lib_floor($arg) {
        $value = $this->assertNumber($arg);

        return array(
            "number",
            floor($value),
            $arg[2]
        );
    }

    protected function lib_ceil($arg) {
        $value = $this->assertNumber($arg);

        return array(
            "number",
            ceil($value),
            $arg[2]
        );
    }

    protected function lib_round($arg) {
        $value = $this->assertNumber($arg);

        return array(
            "number",
            round($value),
            $arg[2]
        );
    }

    protected function lib_unit($arg) {
        if ($arg[0] == "list") {
            list($number, $newUnit) = $arg[2];

            return array(
                "number",
                $this->assertNumber($number),
                $this->compileValue($this->lib_e($newUnit))
            );
        } else {
            return array(
                "number",
                $this->assertNumber($arg),
                ""
            );
        }
    }

    /**
     * Helper function to get arguments for color manipulation functions.
     * takes a list that contains a color like thing and a percentage
     */
    protected function colorArgs($args) {
        if ($args[0] != 'list' || count($args[2]) < 2) {
            return array(
                array(
                    'color',
                    0,
                    0,
                    0
                ),
                0
            );
        }
        list($color, $delta) = $args[2];
        $color = $this->assertColor($color);
        $delta = floatval($delta[1]);

        return array(
            $color,
            $delta
        );
    }

    protected function lib_darken($args) {
        list($color, $delta) = $this->colorArgs($args);

        $hsl    = $this->toHSL($color);
        $hsl[3] = $this->clamp($hsl[3] - $delta, 100);

        return $this->toRGB($hsl);
    }

    protected function lib_lighten($args) {
        list($color, $delta) = $this->colorArgs($args);

        $hsl    = $this->toHSL($color);
        $hsl[3] = $this->clamp($hsl[3] + $delta, 100);

        return $this->toRGB($hsl);
    }

    protected function lib_saturate($args) {
        list($color, $delta) = $this->colorArgs($args);

        $hsl    = $this->toHSL($color);
        $hsl[2] = $this->clamp($hsl[2] + $delta, 100);

        return $this->toRGB($hsl);
    }

    protected function lib_desaturate($args) {
        list($color, $delta) = $this->colorArgs($args);

        $hsl    = $this->toHSL($color);
        $hsl[2] = $this->clamp($hsl[2] - $delta, 100);

        return $this->toRGB($hsl);
    }

    protected function lib_spin($args) {
        list($color, $delta) = $this->colorArgs($args);

        $hsl = $this->toHSL($color);

        $hsl[1] = $hsl[1] + $delta % 360;
        if ($hsl[1] < 0) $hsl[1] += 360;

        return $this->toRGB($hsl);
    }

    protected function lib_fadeout($args) {
        list($color, $delta) = $this->colorArgs($args);
        $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta / 100);

        return $color;
    }

    protected function lib_fadein($args) {
        list($color, $delta) = $this->colorArgs($args);
        $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta / 100);

        return $color;
    }

    protected function lib_hue($color) {
        $hsl = $this->toHSL($this->assertColor($color));

        return round($hsl[1]);
    }

    protected function lib_saturation($color) {
        $hsl = $this->toHSL($this->assertColor($color));

        return round($hsl[2]);
    }

    protected function lib_lightness($color) {
        $hsl = $this->toHSL($this->assertColor($color));

        return round($hsl[3]);
    }

    // get the alpha of a color
    // defaults to 1 for non-colors or colors without an alpha
    protected function lib_alpha($value) {
        if (!is_null($color = $this->coerceColor($value))) {
            return isset($color[4]) ? $color[4] : 1;
        }
    }

    // set the alpha of the color
    protected function lib_fade($args) {
        list($color, $alpha) = $this->colorArgs($args);
        $color[4] = $this->clamp($alpha / 100.0);

        return $color;
    }

    protected function lib_percentage($arg) {
        $num = $this->assertNumber($arg);

        return array(
            "number",
            $num * 100,
            "%"
        );
    }

    // mixes two colors by weight
    // mix(@color1, @color2, @weight);
    // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
    protected function lib_mix($args) {
        if ($args[0] != "list" || count($args[2]) < 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);
    }

    protected function lib_contrast($args) {
        if ($args[0] != 'list' || count($args[2]) < 3) {
            return array(
                array(
                    'color',
                    0,
                    0,
                    0
                ),
                0
            );
        }

        list($inputColor, $darkColor, $lightColor) = $args[2];

        $inputColor = $this->assertColor($inputColor);
        $darkColor  = $this->assertColor($darkColor);
        $lightColor = $this->assertColor($lightColor);
        $hsl        = $this->toHSL($inputColor);

        if ($hsl[3] > 50) {
            return $darkColor;
        }

        return $lightColor;
    }

    protected function assertColor($value, $error = "expected color value") {
        $color = $this->coerceColor($value);
        if (is_null($color)) $this->throwError($error);

        return $color;
    }

    protected function assertNumber($value, $error = "expecting number") {
        if ($value[0] == "number") return $value[1];
        $this->throwError($error);
    }

    protected function toHSL($color) {
        if ($color[0] == 'hsl') return $color;

        $r = $color[1] / 255;
        $g = $color[2] / 255;
        $b = $color[3] / 255;

        $min = min($r, $g, $b);
        $max = max($r, $g, $b);

        $L = ($min + $max) / 2;
        if ($min == $max) {
            $S = $H = 0;
        } else {
            if ($L < 0.5) $S = ($max - $min) / ($max + $min); else
                $S = ($max - $min) / (2.0 - $max - $min);

            if ($r == $max) $H = ($g - $b) / ($max - $min); elseif ($g == $max) $H = 2.0 + ($b - $r) / ($max - $min);
            elseif ($b == $max) $H = 4.0 + ($r - $g) / ($max - $min);

        }

        $out = array(
            'hsl',
            ($H < 0 ? $H + 6 : $H) * 60,
            $S * 100,
            $L * 100,
        );

        if (count($color) > 4) $out[] = $color[4]; // copy alpha

        return $out;
    }

    protected function toRGB_helper($comp, $temp1, $temp2) {
        if ($comp < 0) $comp += 1.0; elseif ($comp > 1) $comp -= 1.0;

        if (6 * $comp < 1) return $temp1 + ($temp2 - $temp1) * 6 * $comp;
        if (2 * $comp < 1) return $temp2;
        if (3 * $comp < 2) return $temp1 + ($temp2 - $temp1) * ((2 / 3) - $comp) * 6;

        return $temp1;
    }

    /**
     * Converts a hsl array into a color value in rgb.
     * Expects H to be in range of 0 to 360, S and L in 0 to 100
     */
    protected function toRGB($color) {
        if ($color == 'color') return $color;

        $H = $color[1] / 360;
        $S = $color[2] / 100;
        $L = $color[3] / 100;

        if ($S == 0) {
            $r = $g = $b = $L;
        } else {
            $temp2 = $L < 0.5 ? $L * (1.0 + $S) : $L + $S - $L * $S;

            $temp1 = 2.0 * $L - $temp2;

            $r = $this->toRGB_helper($H + 1 / 3, $temp1, $temp2);
            $g = $this->toRGB_helper($H, $temp1, $temp2);
            $b = $this->toRGB_helper($H - 1 / 3, $temp1, $temp2);
        }

        // $out = array('color', round($r*255), round($g*255), round($b*255));
        $out = array(
            'color',
            $r * 255,
            $g * 255,
            $b * 255
        );
        if (count($color) > 4) $out[] = $color[4]; // copy alpha

        return $out;
    }

    protected function clamp($v, $max = 1, $min = 0) {
        return min($max, max($min, $v));
    }

    /**
     * Convert the rgb, rgba, hsl color literals of function type
     * as returned by the parser into values of color type.
     */
    protected function funcToColor($func) {
        $fname = $func[1];
        if ($func[2][0] != 'list') return false; // need a list of arguments
        $rawComponents = $func[2][2];

        if ($fname == 'hsl' || $fname == 'hsla') {
            $hsl = array('hsl');
            $i   = 0;
            foreach ($rawComponents as $c) {
                $val = $this->reduce($c);
                $val = isset($val[1]) ? floatval($val[1]) : 0;

                if ($i == 0) $clamp = 360; elseif ($i < 3) $clamp = 100;
                else $clamp = 1;

                $hsl[] = $this->clamp($val, $clamp);
                $i++;
            }

            while (count($hsl) < 4) $hsl[] = 0;

            return $this->toRGB($hsl);

        } elseif ($fname == 'rgb' || $fname == 'rgba') {
            $components = array();
            $i          = 1;
            foreach ($rawComponents as $c) {
                $c = $this->reduce($c);
                if ($i < 4) {
                    if ($c[0] == "number" && $c[2] == "%") {
                        $components[] = 255 * ($c[1] / 100);
                    } else {
                        $components[] = floatval($c[1]);
                    }
                } elseif ($i == 4) {
                    if ($c[0] == "number" && $c[2] == "%") {
                        $components[] = 1.0 * ($c[1] / 100);
                    } else {
                        $components[] = floatval($c[1]);
                    }
                } else break;

                $i++;
            }
            while (count($components) < 3) $components[] = 0;
            array_unshift($components, 'color');

            return $this->fixColor($components);
        }

        return false;
    }

    protected function reduce($value, $forExpression = false) {
        switch ($value[0]) {
            case "interpolate":
                $reduced = $this->reduce($value[1]);
                $var     = $this->compileValue($reduced);
                $res     = $this->reduce(array(
                    "variable",
                    $this->vPrefix . $var
                ));

                if (empty($value[2])) $res = $this->lib_e($res);

                return $res;
            case "variable":
                $key = $value[1];
                if (is_array($key)) {
                    $key = $this->reduce($key);
                    $key = $this->vPrefix . $this->compileValue($this->lib_e($key));
                }

                $seen =& $this->env->seenNames;

                if (!empty($seen[$key])) {
                    $this->throwError("infinite loop detected: $key");
                }

                $seen[$key] = true;
                $out        = $this->reduce($this->get($key, self::$defaultValue));
                $seen[$key] = false;

                return $out;
            case "list":
                foreach ($value[2] as &$item) {
                    $item = $this->reduce($item, $forExpression);
                }

                return $value;
            case "expression":
                return $this->evaluate($value);
            case "string":
                foreach ($value[2] as &$part) {
                    if (is_array($part)) {
                        $strip = $part[0] == "variable";
                        $part  = $this->reduce($part);
                        if ($strip) $part = $this->lib_e($part);
                    }
                }

                return $value;
            case "escape":
                list(, $inner) = $value;

                return $this->lib_e($this->reduce($inner));
            case "function":
                $color = $this->funcToColor($value);
                if ($color) return $color;

                list(, $name, $args) = $value;
                if ($name == "%") $name = "_sprintf";
                $f = isset($this->libFunctions[$name]) ? $this->libFunctions[$name] : array(
                    $this,
                    'lib_' . $name
                );

                if (is_callable($f)) {
                    if ($args[0] == 'list') $args = self::compressList($args[2], $args[1]);

                    $ret = call_user_func($f, $this->reduce($args, true), $this);

                    if (is_null($ret)) {
                        return array(
                            "string",
                            "",
                            array(
                                $name,
                                "(",
                                $args,
                                ")"
                            )
                        );
                    }

                    // convert to a typed value if the result is a php primitive
                    if (is_numeric($ret)) $ret = array(
                        'number',
                        $ret,
                        ""
                    ); elseif (!is_array($ret)) $ret = array(
                        'keyword',
                        $ret
                    );

                    return $ret;
                }

                // plain function, reduce args
                $value[2] = $this->reduce($value[2]);

                return $value;
            case "unary":
                list(, $op, $exp) = $value;
                $exp = $this->reduce($exp);

                if ($exp[0] == "number") {
                    switch ($op) {
                        case "+":
                            return $exp;
                        case "-":
                            $exp[1] *= -1;

                            return $exp;
                    }
                }

                return array(
                    "string",
                    "",
                    array(
                        $op,
                        $exp
                    )
                );
        }

        if ($forExpression) {
            switch ($value[0]) {
                case "keyword":
                    if ($color = $this->coerceColor($value)) {
                        return $color;
                    }
                    break;
                case "raw_color":
                    return $this->coerceColor($value);
            }
        }

        return $value;
    }


    // coerce a value for use in color operation
    protected function coerceColor($value) {
        switch ($value[0]) {
            case 'color':
                return $value;
            case 'raw_color':
                $c        = array(
                    "color",
                    0,
                    0,
                    0
                );
                $colorStr = substr($value[1], 1);
                $num      = hexdec($colorStr);
                $width    = strlen($colorStr) == 3 ? 16 : 256;

                for ($i = 3; $i > 0; $i--) { // 3 2 1
                    $t   = fmod($num, $width);
                    $num /= $width;

                    $c[$i] = $t * (256 / $width) + $t * floor(16 / $width);
                }

                return $c;
            case 'keyword':
                $name = $value[1];
                if (isset(self::$cssColors[$name])) {
                    $rgba = explode(',', self::$cssColors[$name]);

                    if (isset($rgba[3])) return array(
                        'color',
                        $rgba[0],
                        $rgba[1],
                        $rgba[2],
                        $rgba[3]
                    );

                    return array(
                        'color',
                        $rgba[0],
                        $rgba[1],
                        $rgba[2]
                    );
                }

                return null;
        }
    }

    // make something string like into a string
    protected function coerceString($value) {
        switch ($value[0]) {
            case "string":
                return $value;
            case "keyword":
                return array(
                    "string",
                    "",
                    array($value[1])
                );
        }

        return null;
    }

    // turn list of length 1 into value type
    protected function flattenList($value) {
        if ($value[0] == "list" && count($value[2]) == 1) {
            return $this->flattenList($value[2][0]);
        }

        return $value;
    }

    protected function toBool($a) {
        if ($a) return self::$TRUE; else return self::$FALSE;
    }

    // evaluate an expression
    protected function evaluate($exp) {
        list(, $op, $left, $right, $whiteBefore, $whiteAfter) = $exp;

        $left  = $this->reduce($left, true);
        $right = $this->reduce($right, true);

        if ($leftColor = $this->coerceColor($left)) {
            $left = $leftColor;
        }

        if ($rightColor = $this->coerceColor($right)) {
            $right = $rightColor;
        }

        $ltype = $left[0];
        $rtype = $right[0];

        // operators that work on all types
        if ($op == "and") {
            return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
        }

        if ($op == "=") {
            return $this->toBool($this->eq($left, $right));
        }

        if ($op == "+" && !is_null($str = $this->stringConcatenate($left, $right))) {
            return $str;
        }

        // type based operators
        $fname = "op_{$ltype}_{$rtype}";
        if (is_callable(array(
            $this,
            $fname
        ))) {
            $out = $this->$fname($op, $left, $right);
            if (!is_null($out)) return $out;
        }

        // make the expression look it did before being parsed
        $paddedOp = $op;
        if ($whiteBefore) $paddedOp = " " . $paddedOp;
        if ($whiteAfter) $paddedOp .= " ";

        return array(
            "string",
            "",
            array(
                $left,
                $paddedOp,
                $right
            )
        );
    }

    protected function stringConcatenate($left, $right) {
        if ($strLeft = $this->coerceString($left)) {
            if ($right[0] == "string") {
                $right[1] = "";
            }
            $strLeft[2][] = $right;

            return $strLeft;
        }

        if ($strRight = $this->coerceString($right)) {
            array_unshift($strRight[2], $left);

            return $strRight;
        }
    }


    // make sure a color's components don't go out of bounds
    protected function fixColor($c) {
        foreach (range(1, 3) as $i) {
            if ($c[$i] < 0) $c[$i] = 0;
            if ($c[$i] > 255) $c[$i] = 255;
        }

        return $c;
    }

    protected function op_number_color($op, $lft, $rgt) {
        if ($op == '+' || $op == '*') {
            return $this->op_color_number($op, $rgt, $lft);
        }
    }

    protected function op_color_number($op, $lft, $rgt) {
        if ($rgt[0] == '%') $rgt[1] /= 100;

        return $this->op_color_color($op, $lft, array_fill(1, count($lft) - 1, $rgt[1]));
    }

    protected 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);
    }

    function lib_red($color) {
        $color = $this->coerceColor($color);
        if (is_null($color)) {
            $this->throwError('color expected for red()');
        }

        return $color[1];
    }

    function lib_green($color) {
        $color = $this->coerceColor($color);
        if (is_null($color)) {
            $this->throwError('color expected for green()');
        }

        return $color[2];
    }

    function lib_blue($color) {
        $color = $this->coerceColor($color);
        if (is_null($color)) {
            $this->throwError('color expected for blue()');
        }

        return $color[3];
    }


    // operator on two numbers
    protected function op_number_number($op, $left, $right) {
        $unit = empty($left[2]) ? $right[2] : $left[2];

        $value = 0;
        switch ($op) {
            case '+':
                $value = $left[1] + $right[1];
                break;
            case '*':
                $value = $left[1] * $right[1];
                break;
            case '-':
                $value = $left[1] - $right[1];
                break;
            case '%':
                $value = $left[1] % $right[1];
                break;
            case '/':
                if ($right[1] == 0) $this->throwError('parse error: divide by zero');
                $value = $left[1] / $right[1];
                break;
            case '<':
                return $this->toBool($left[1] < $right[1]);
            case '>':
                return $this->toBool($left[1] > $right[1]);
            case '>=':
                return $this->toBool($left[1] >= $right[1]);
            case '=<':
                return $this->toBool($left[1] <= $right[1]);
            default:
                $this->throwError('parse error: unknown number operator: ' . $op);
        }

        return array(
            "number",
            $value,
            $unit
        );
    }


    /* environment functions */

    protected function makeOutputBlock($type, $selectors = null) {
        $b            = new stdClass;
        $b->lines     = array();
        $b->children  = array();
        $b->selectors = $selectors;
        $b->type      = $type;
        $b->parent    = $this->scope;

        return $b;
    }

    // the state of execution
    protected function pushEnv($block = null) {
        $e         = new stdclass;
        $e->parent = $this->env;
        $e->store  = array();
        $e->block  = $block;

        $this->env = $e;

        return $e;
    }

    // pop something off the stack
    protected function popEnv() {
        $old       = $this->env;
        $this->env = $this->env->parent;

        return $old;
    }

    // set something in the current env
    protected function set($name, $value) {
        $this->env->store[$name] = $value;
    }


    // get the highest occurrence entry for a name
    protected function get($name, $default = null) {
        $current = $this->env;

        $isArguments = $name == $this->vPrefix . 'arguments';
        while ($current) {
            if ($isArguments && isset($current->arguments)) {
                return array(
                    'list',
                    ' ',
                    $current->arguments
                );
            }

            if (isset($current->store[$name])) return $current->store[$name]; else {
                $current = isset($current->storeParent) ? $current->storeParent : $current->parent;
            }
        }

        return $default;
    }

    // inject array of unparsed strings into environment as variables
    protected function injectVariables($args) {
        $this->pushEnv();
        $parser = new LessParser($this, __METHOD__);
        foreach ($args as $name => $strValue) {
            if ($name[0] != '@') $name = '@' . $name;
            $parser->count  = 0;
            $parser->buffer = (string)$strValue;
            if (!$parser->propertyValue($value)) {
                throw new Exception("failed to parse passed in variable $name: $strValue");
            }

            $this->set($name, $value);
        }
    }

    /**
     * Initialize any static state, can initialize parser for a file
     * $opts isn't used yet
     */
    public function __construct($fname = null) {
        if ($fname !== null) {
            // used for deprecated parse method
            $this->_parseFile = $fname;
        }
    }

    public function compile($string, $name = null) {
        $locale = setlocale(LC_NUMERIC, 0);
        setlocale(LC_NUMERIC, "C");

        $this->parser = $this->makeParser($name);
        $root         = $this->parser->parse($string);

        $this->env   = null;
        $this->scope = null;

        $this->formatter = $this->newFormatter();

        if (!empty($this->registeredVars)) {
            $this->injectVariables($this->registeredVars);
        }

        $this->sourceParser = $this->parser; // used for error messages
        $this->compileBlock($root);

        $out = $this->formatter->block($this->scope);

        setlocale(LC_NUMERIC, $locale);

        return $out;
    }

    public function compileFile($fname, $outFname = null) {
        if (!is_readable($fname)) {
            throw new Exception('load error: failed to find ' . $fname);
        }

        $pi = pathinfo($fname);

        $oldImport = $this->importDir;

        $this->importDir   = (array)$this->importDir;
        $this->importDir[] = $pi['dirname'] . '/';

        $this->allParsedFiles = array();
        $this->addParsedFile($fname);

        $out = $this->compile(file_get_contents($fname), $fname);

        $this->importDir = $oldImport;

        if ($outFname !== null) {
            return file_put_contents($outFname, $out);
        }

        return $out;
    }

    // compile only if changed input has changed or output doesn't exist
    public function checkedCompile($in, $out) {
        if (!is_file($out) || filemtime($in) > filemtime($out)) {
            $this->compileFile($in, $out);

            return true;
        }

        return false;
    }

    /**
     * Execute lessphp on a .less file or a lessphp cache structure
     *
     * The lessphp cache structure contains information about a specific
     * less file having been parsed. It can be used as a hint for future
     * calls to determine whether or not a rebuild is required.
     *
     * The cache structure contains two important keys that may be used
     * externally:
     *
     * compiled: The final compiled CSS
     * updated: The time (in seconds) the CSS was last compiled
     *
     * The cache structure is a plain-ol' PHP associative array and can
     * be serialized and unserialized without a hitch.
     *
     * @param mixed $in    Input
     * @param bool  $force Force rebuild?
     *
     * @return array lessphp cache structure
     */
    public function cachedCompile($in, $force = false) {
        // assume no root
        $root = null;

        if (is_string($in)) {
            $root = $in;
        } elseif (is_array($in) and isset($in['root'])) {
            if ($force or !isset($in['files'])) {
                // If we are forcing a recompile or if for some reason the
                // structure does not contain any file information we should
                // specify the root to trigger a rebuild.
                $root = $in['root'];
            } elseif (isset($in['files']) and is_array($in['files'])) {
                foreach ($in['files'] as $fname => $ftime) {
                    if (!file_exists($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.
            $out             = array();
            $out['root']     = $root;
            $out['compiled'] = $this->compileFile($root);
            $out['files']    = $this->allParsedFiles();
            $out['updated']  = time();

            return $out;
        } else {
            // No changes, pass back the structure
            // we were given initially.
            return $in;
        }

    }

    // parse and compile buffer
    // This is deprecated
    public function parse($str = null, $initialVariables = null) {
        if (is_array($str)) {
            $initialVariables = $str;
            $str              = null;
        }

        $oldVars = $this->registeredVars;
        if ($initialVariables !== null) {
            $this->setVariables($initialVariables);
        }

        if ($str == null) {
            if (empty($this->_parseFile)) {
                throw new Exception("nothing to parse");
            }

            $out = $this->compileFile($this->_parseFile);
        } else {
            $out = $this->compile($str);
        }

        $this->registeredVars = $oldVars;

        return $out;
    }

    protected function makeParser($name) {
        $parser                = new LessParser($this, $name);
        $parser->writeComments = $this->preserveComments;

        return $parser;
    }

    public function setFormatter($name) {
        $this->formatterName = $name;
    }

    /**
     * @return Classic
     */
    protected function newFormatter() {
        return new Compressed();
    }

    public function setPreserveComments($preserve) {
        $this->preserveComments = $preserve;
    }

    public function registerFunction($name, $func) {
        $this->libFunctions[$name] = $func;
    }

    public function unregisterFunction($name) {
        unset($this->libFunctions[$name]);
    }

    public function setVariables($variables) {
        $this->registeredVars = array_merge($this->registeredVars, $variables);
    }

    /**
     * @return array
     */
    public function getVariables() {
        return $this->registeredVars;
    }

    public function unsetVariable($name) {
        unset($this->registeredVars[$name]);
    }

    public function setImportDir($dirs) {
        $this->importDir = (array)$dirs;
    }

    public function addImportDir($dir) {
        $this->importDir   = (array)$this->importDir;
        $this->importDir[] = $dir;
    }

    public function allParsedFiles() {
        return $this->allParsedFiles;
    }

    protected function addParsedFile($file) {
        $this->allParsedFiles[Filesystem::realpath($file)] = filemtime($file);
    }

    /**
     * Uses the current value of $this->count to show line and line number
     */
    protected function throwError($msg = null) {
        if ($this->sourceLoc >= 0) {
            $this->sourceParser->throwError($msg, $this->sourceLoc);
        }
        throw new Exception($msg);
    }

    // compile file $in to file $out if $in is newer than $out
    // returns true when it compiles, false otherwise
    public static function ccompile($in, $out, $less = null) {
        if ($less === null) {
            $less = new self;
        }

        return $less->checkedCompile($in, $out);
    }

    public static function cexecute($in, $force = false, $less = null) {
        if ($less === null) {
            $less = new self;
        }

        return $less->cachedCompile($in, $force);
    }

    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',
        'transparent'          => '0,0,0,0',
        'turquoise'            => '64,224,208',
        'violet'               => '238,130,238',
        'wheat'                => '245,222,179',
        'white'                => '255,255,255',
        'whitesmoke'           => '245,245,245',
        'yellow'               => '255,255,0',
        'yellowgreen'          => '154,205,50'
    );
}




Youez - 2016 - github.com/yon3zu
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