Edit File by line

<?php

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namespace Nextend\Framework\Asset\Css\Less;

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use Exception;

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use stdClass;

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#[\AllowDynamicProperties]

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class LessParser {

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static protected $nextBlockId = 0; // used to uniquely identify blocks

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static protected $precedence = array(

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'=<' => 0,

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'>=' => 0,

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'=' => 0,

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'<' => 0,

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'>' => 0,

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'+' => 1,

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'-' => 1,

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'*' => 2,

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'/' => 2,

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'%' => 2,

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);

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static protected $whitePattern;

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static protected $commentMulti;

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static protected $commentSingle = "//";

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static protected $commentMultiLeft = "/*";

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static protected $commentMultiRight = "*/";

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// regex string to match any of the operators

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static protected $operatorString;

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// these properties will supress division unless it's inside parenthases

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static protected $supressDivisionProps = array(

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'/border-radius$/i',

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'/^font$/i'

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);

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protected $blockDirectives = array(

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"font-face",

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"keyframes",

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"page",

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"-moz-document"

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);

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protected $lineDirectives = array("charset");

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/**

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* if we are in parens we can be more liberal with whitespace around

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* operators because it must evaluate to a single value and thus is less

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* ambiguous.

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* Consider:

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* property1: 10 -5; // is two numbers, 10 and -5

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* property2: (10 -5); // should evaluate to 5

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protected $inParens = false;

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// caches preg escaped literals

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static protected $literalCache = array();

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public function __construct($lessc, $sourceName = null) {

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$this->eatWhiteDefault = true;

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// reference to less needed for vPrefix, mPrefix, and parentSelector

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$this->lessc = $lessc;

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$this->sourceName = $sourceName; // name used for error messages

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$this->writeComments = false;

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if (!self::$operatorString) {

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self::$operatorString = '(' . implode('|', array_map(array(

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LessCompiler::class,

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'preg_quote'

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), array_keys(self::$precedence))) . ')';

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$commentSingle = LessCompiler::preg_quote(self::$commentSingle);

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$commentMultiLeft = LessCompiler::preg_quote(self::$commentMultiLeft);

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$commentMultiRight = LessCompiler::preg_quote(self::$commentMultiRight);

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self::$commentMulti = $commentMultiLeft . '.*?' . $commentMultiRight;

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self::$whitePattern = '/' . $commentSingle . '[^\n]*\s*|(' . self::$commentMulti . ')\s*|\s+/Ais';

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}

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}

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public function parse($buffer) {

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$this->count = 0;

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$this->line = 1;

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$this->env = null; // block stack

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$this->buffer = $this->writeComments ? $buffer : $this->removeComments($buffer);

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$this->pushSpecialBlock("root");

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$this->eatWhiteDefault = true;

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$this->seenComments = array();

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// trim whitespace on head

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// if (preg_match('/^\s+/', $this->buffer, $m)) {

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// $this->line += substr_count($m[0], "\n");

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// $this->buffer = ltrim($this->buffer);

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// }

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$this->whitespace();

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// parse the entire file

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$lastCount = $this->count;

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while (false !== $this->parseChunk()) ;

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if ($this->count != strlen($this->buffer)) $this->throwError();

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// TODO report where the block was opened

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if (!is_null($this->env->parent)) throw new Exception('parse error: unclosed block');

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return $this->env;

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}

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/**

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* Parse a single chunk off the head of the buffer and append it to the

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* current parse environment.

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* Returns false when the buffer is empty, or when there is an error.

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* This function is called repeatedly until the entire document is

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* parsed.

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* This parser is most similar to a recursive descent parser. Single

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* functions represent discrete grammatical rules for the language, and

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* they are able to capture the text that represents those rules.

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* Consider the function lessc::keyword(). (all parse functions are

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* structured the same)

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* The function takes a single reference argument. When calling the

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* function it will attempt to match a keyword on the head of the buffer.

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* If it is successful, it will place the keyword in the referenced

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* argument, advance the position in the buffer, and return true. If it

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* fails then it won't advance the buffer and it will return false.

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* All of these parse functions are powered by lessc::match(), which behaves

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* the same way, but takes a literal regular expression. Sometimes it is

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* more convenient to use match instead of creating a new function.

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* Because of the format of the functions, to parse an entire string of

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* grammatical rules, you can chain them together using &&.

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* But, if some of the rules in the chain succeed before one fails, then

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* the buffer position will be left at an invalid state. In order to

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* avoid this, lessc::seek() is used to remember and set buffer positions.

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* Before parsing a chain, use $s = $this->seek() to remember the current

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* position into $s. Then if a chain fails, use $this->seek($s) to

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* go back where we started.

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protected function parseChunk() {

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if (empty($this->buffer)) return false;

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$s = $this->seek();

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// setting a property

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if ($this->keyword($key) && $this->assign() && $this->propertyValue($value, $key) && $this->end()) {

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$this->append(array(

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'assign',

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$key,

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$value

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), $s);

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return true;

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} else {

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$this->seek($s);

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}

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// look for special css blocks

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if ($this->literal('@', false)) {

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$this->count--;

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// media

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if ($this->literal('@media')) {

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if (($this->mediaQueryList($mediaQueries) || true) && $this->literal('{')) {

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$media = $this->pushSpecialBlock("media");

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$media->queries = is_null($mediaQueries) ? array() : $mediaQueries;

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return true;

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} else {

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$this->seek($s);

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return false;

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}

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}

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if ($this->literal("@", false) && $this->keyword($dirName)) {

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if ($this->isDirective($dirName, $this->blockDirectives)) {

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if (($this->openString("{", $dirValue, null, array(";")) || true) && $this->literal("{")) {

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$dir = $this->pushSpecialBlock("directive");

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$dir->name = $dirName;

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if (isset($dirValue)) $dir->value = $dirValue;

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return true;

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}

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} elseif ($this->isDirective($dirName, $this->lineDirectives)) {

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if ($this->propertyValue($dirValue) && $this->end()) {

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$this->append(array(

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"directive",

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$dirName,

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$dirValue

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));

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return true;

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}

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}

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}

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$this->seek($s);

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}

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// setting a variable

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if ($this->variable($var) && $this->assign() && $this->propertyValue($value) && $this->end()) {

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$this->append(array(

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'assign',

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$var,

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$value

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), $s);

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return true;

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} else {

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$this->seek($s);

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}

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if ($this->import($importValue)) {

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$this->append($importValue, $s);

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return true;

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}

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// opening parametric mixin

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if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) && ($this->guards($guards) || true) && $this->literal('{')) {

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$block = $this->pushBlock($this->fixTags(array($tag)));

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$block->args = $args;

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$block->isVararg = $isVararg;

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if (!empty($guards)) $block->guards = $guards;

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return true;

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} else {

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$this->seek($s);

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}

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// opening a simple block

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if ($this->tags($tags) && $this->literal('{')) {

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$tags = $this->fixTags($tags);

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$this->pushBlock($tags);

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return true;

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} else {

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$this->seek($s);

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}

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// closing a block

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if ($this->literal('}', false)) {

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try {

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$block = $this->pop();

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} catch (Exception $e) {

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$this->seek($s);

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$this->throwError($e->getMessage());

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}

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$hidden = false;

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if (is_null($block->type)) {

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$hidden = true;

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if (!isset($block->args)) {

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foreach ($block->tags as $tag) {

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if (!is_string($tag) || $tag[0] != $this->lessc->mPrefix) {

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$hidden = false;

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break;

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}

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}

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}

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foreach ($block->tags as $tag) {

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if (is_string($tag)) {

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$this->env->children[$tag][] = $block;

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}

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}

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}

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if (!$hidden) {

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$this->append(array(

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'block',

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$block

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), $s);

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}

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// this is done here so comments aren't bundled into he block that

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// was just closed

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$this->whitespace();

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return true;

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}

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// mixin

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if ($this->mixinTags($tags) && ($this->argumentValues($argv) || true) && ($this->keyword($suffix) || true) && $this->end()) {

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$tags = $this->fixTags($tags);

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$this->append(array(

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'mixin',

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$tags,

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$argv,

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$suffix

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), $s);

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return true;

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} else {

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$this->seek($s);

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}

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// spare ;

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if ($this->literal(';')) return true;

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return false; // got nothing, throw error

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}

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protected function isDirective($dirname, $directives) {

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// TODO: cache pattern in parser

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$pattern = implode("|", array_map(array(

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LessCompiler::class,

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"preg_quote"

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), $directives));

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$pattern = '/^(-[a-z-]+-)?(' . $pattern . ')$/i';

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return preg_match($pattern, $dirname);

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}

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protected function fixTags($tags) {

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// move @ tags out of variable namespace

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foreach ($tags as &$tag) {

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if ($tag[0] == $this->lessc->vPrefix) $tag[0] = $this->lessc->mPrefix;

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}

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return $tags;

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}

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// a list of expressions

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protected function expressionList(&$exps) {

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$values = array();

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while ($this->expression($exp)) {

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$values[] = $exp;

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}

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if (count($values) == 0) return false;

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$exps = LessCompiler::compressList($values, ' ');

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return true;

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}

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/**

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* Attempt to consume an expression.

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* @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code

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protected function expression(&$out) {

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if ($this->value($lhs)) {

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$out = $this->expHelper($lhs, 0);

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// look for / shorthand

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if (!empty($this->env->supressedDivision)) {

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unset($this->env->supressedDivision);

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$s = $this->seek();

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if ($this->literal("/") && $this->value($rhs)) {

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$out = array(

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"list",

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"",

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array(

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$out,

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array(

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"keyword",

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"/"

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$rhs

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)

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);

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} else {

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$this->seek($s);

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}

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}

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return true;

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}

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return false;

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}

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/**

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* recursively parse infix equation with $lhs at precedence $minP

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protected function expHelper($lhs, $minP) {

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$this->inExp = true;

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$ss = $this->seek();

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while (true) {

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$whiteBefore = isset($this->buffer[$this->count - 1]) && preg_match('/^\\s+$/', $this->buffer[$this->count - 1]);

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// If there is whitespace before the operator, then we require

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// whitespace after the operator for it to be an expression

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$needWhite = $whiteBefore && !$this->inParens;

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if ($this->match(self::$operatorString . ($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP) {

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if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/" && empty($this->env->supressedDivision)) {

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foreach (self::$supressDivisionProps as $pattern) {

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if (preg_match($pattern, $this->env->currentProperty)) {

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$this->env->supressedDivision = true;

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break 2;

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}

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}

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}

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$whiteAfter = isset($this->buffer[$this->count - 1]) && preg_match('/^\\s+$/', $this->buffer[$this->count - 1]);

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if (!$this->value($rhs)) break;

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// peek for next operator to see what to do with rhs

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if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {

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$rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);

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}

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$lhs = array(

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'expression',

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$m[1],

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$lhs,

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$rhs,

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$whiteBefore,

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$whiteAfter

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);

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$ss = $this->seek();

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continue;

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}

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break;

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}

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$this->seek($ss);

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return $lhs;

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}

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// consume a list of values for a property

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public function propertyValue(&$value, $keyName = null) {

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$values = array();

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if ($keyName !== null) $this->env->currentProperty = $keyName;

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$s = null;

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while ($this->expressionList($v)) {

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$values[] = $v;

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$s = $this->seek();

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if (!$this->literal(',')) break;

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}

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if ($s) $this->seek($s);

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if ($keyName !== null) unset($this->env->currentProperty);

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if (count($values) == 0) return false;

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$value = LessCompiler::compressList($values, ', ');

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return true;

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}

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protected function parenValue(&$out) {

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$s = $this->seek();

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// speed shortcut

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if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(") {

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return false;

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}

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$inParens = $this->inParens;

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if ($this->literal("(") && ($this->inParens = true) && $this->expression($exp) && $this->literal(")")) {

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$out = $exp;

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$this->inParens = $inParens;

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return true;

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} else {

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$this->inParens = $inParens;

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$this->seek($s);

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}

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return false;

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}

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// a single value

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protected function value(&$value) {

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$s = $this->seek();

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// speed shortcut

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if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "-") {

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// negation

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if ($this->literal("-", false) && (($this->variable($inner) && $inner = array(

[499] Fix | Delete

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