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<?php
/**
* SCSSPHP
*
* @copyright 2012-2017 Leaf Corcoran
*
* @license http://opensource.org/licenses/MIT MIT
*
* @link http://leafo.github.io/scssphp
*/
namespace Leafo\ScssPhp;
use Leafo\ScssPhp\Block;
use Leafo\ScssPhp\Compiler;
use Leafo\ScssPhp\Exception\ParserException;
use Leafo\ScssPhp\Node;
use Leafo\ScssPhp\Type;
/**
* Parser
*
* @author Leaf Corcoran <leafot@gmail.com>
*/
class Parser
{
const SOURCE_INDEX = -1;
const SOURCE_LINE = -2;
const SOURCE_COLUMN = -3;
/**
* @var array
*/
protected static $precedence = [
'=' => 0,
'or' => 1,
'and' => 2,
'==' => 3,
'!=' => 3,
'<=>' => 3,
'<=' => 4,
'>=' => 4,
'<' => 4,
'>' => 4,
'+' => 5,
'-' => 5,
'*' => 6,
'/' => 6,
'%' => 6,
];
protected static $commentPattern;
protected static $operatorPattern;
protected static $whitePattern;
private $sourceName;
private $sourceIndex;
private $sourcePositions;
private $charset;
private $count;
private $env;
private $inParens;
private $eatWhiteDefault;
private $buffer;
private $utf8;
private $encoding;
private $patternModifiers;
/**
* Constructor
*
* @api
*
* @param string $sourceName
* @param integer $sourceIndex
* @param string $encoding
*/
public function __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8')
{
$this->sourceName = $sourceName ?: '(stdin)';
$this->sourceIndex = $sourceIndex;
$this->charset = null;
$this->utf8 = ! $encoding || strtolower($encoding) === 'utf-8';
$this->patternModifiers = $this->utf8 ? 'Aisu' : 'Ais';
if (empty(static::$operatorPattern)) {
static::$operatorPattern = '([*\/%+-]|[!=]\=|\>\=?|\<\=\>|\<\=?|and|or)';
$commentSingle = '\/\/';
$commentMultiLeft = '\/\*';
$commentMultiRight = '\*\/';
static::$commentPattern = $commentMultiLeft . '.*?' . $commentMultiRight;
static::$whitePattern = $this->utf8
? '/' . $commentSingle . '[^\n]*\s*|(' . static::$commentPattern . ')\s*|\s+/AisuS'
: '/' . $commentSingle . '[^\n]*\s*|(' . static::$commentPattern . ')\s*|\s+/AisS';
}
}
/**
* Get source file name
*
* @api
*
* @return string
*/
public function getSourceName()
{
return $this->sourceName;
}
/**
* Throw parser error
*
* @api
*
* @param string $msg
*
* @throws \Leafo\ScssPhp\Exception\ParserException
*/
public function throwParseError($msg = 'parse error')
{
list($line, /* $column */) = $this->getSourcePosition($this->count);
$loc = empty($this->sourceName) ? "line: $line" : "$this->sourceName on line $line";
if ($this->peek("(.*?)(\n|$)", $m, $this->count)) {
throw new ParserException("$msg: failed at `$m[1]` $loc");
}
throw new ParserException("$msg: $loc");
}
/**
* Parser buffer
*
* @api
*
* @param string $buffer
*
* @return \Leafo\ScssPhp\Block
*/
public function parse($buffer)
{
// strip BOM (byte order marker)
if (substr($buffer, 0, 3) === "\xef\xbb\xbf") {
$buffer = substr($buffer, 3);
}
$this->buffer = rtrim($buffer, "\x00..\x1f");
$this->count = 0;
$this->env = null;
$this->inParens = false;
$this->eatWhiteDefault = true;
$this->saveEncoding();
$this->extractLineNumbers($buffer);
$this->pushBlock(null); // root block
$this->whitespace();
$this->pushBlock(null);
$this->popBlock();
while ($this->parseChunk()) {
;
}
if ($this->count !== strlen($this->buffer)) {
$this->throwParseError();
}
if (! empty($this->env->parent)) {
$this->throwParseError('unclosed block');
}
if ($this->charset) {
array_unshift($this->env->children, $this->charset);
}
$this->env->isRoot = true;
$this->restoreEncoding();
return $this->env;
}
/**
* Parse a value or value list
*
* @api
*
* @param string $buffer
* @param string $out
*
* @return boolean
*/
public function parseValue($buffer, &$out)
{
$this->count = 0;
$this->env = null;
$this->inParens = false;
$this->eatWhiteDefault = true;
$this->buffer = (string) $buffer;
$this->saveEncoding();
$list = $this->valueList($out);
$this->restoreEncoding();
return $list;
}
/**
* Parse a selector or selector list
*
* @api
*
* @param string $buffer
* @param string $out
*
* @return boolean
*/
public function parseSelector($buffer, &$out)
{
$this->count = 0;
$this->env = null;
$this->inParens = false;
$this->eatWhiteDefault = true;
$this->buffer = (string) $buffer;
$this->saveEncoding();
$selector = $this->selectors($out);
$this->restoreEncoding();
return $selector;
}
/**
* Parse a single chunk off the head of the buffer and append it to the
* current parse environment.
*
* Returns false when the buffer is empty, or when there is an error.
*
* This function is called repeatedly until the entire document is
* parsed.
*
* This parser is most similar to a recursive descent parser. Single
* functions represent discrete grammatical rules for the language, and
* they are able to capture the text that represents those rules.
*
* Consider the function Compiler::keyword(). (All parse functions are
* structured the same.)
*
* The function takes a single reference argument. When calling the
* function it will attempt to match a keyword on the head of the buffer.
* If it is successful, it will place the keyword in the referenced
* argument, advance the position in the buffer, and return true. If it
* fails then it won't advance the buffer and it will return false.
*
* All of these parse functions are powered by Compiler::match(), which behaves
* the same way, but takes a literal regular expression. Sometimes it is
* more convenient to use match instead of creating a new function.
*
* Because of the format of the functions, to parse an entire string of
* grammatical rules, you can chain them together using &&.
*
* But, if some of the rules in the chain succeed before one fails, then
* the buffer position will be left at an invalid state. In order to
* avoid this, Compiler::seek() is used to remember and set buffer positions.
*
* Before parsing a chain, use $s = $this->seek() to remember the current
* position into $s. Then if a chain fails, use $this->seek($s) to
* go back where we started.
*
* @return boolean
*/
protected function parseChunk()
{
$s = $this->seek();
// the directives
if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] === '@') {
if ($this->literal('@at-root') &&
($this->selectors($selector) || true) &&
($this->map($with) || true) &&
$this->literal('{')
) {
$atRoot = $this->pushSpecialBlock(Type::T_AT_ROOT, $s);
$atRoot->selector = $selector;
$atRoot->with = $with;
return true;
}
$this->seek($s);
if ($this->literal('@media') && $this->mediaQueryList($mediaQueryList) && $this->literal('{')) {
$media = $this->pushSpecialBlock(Type::T_MEDIA, $s);
$media->queryList = $mediaQueryList[2];
return true;
}
$this->seek($s);
if ($this->literal('@mixin') &&
$this->keyword($mixinName) &&
($this->argumentDef($args) || true) &&
$this->literal('{')
) {
$mixin = $this->pushSpecialBlock(Type::T_MIXIN, $s);
$mixin->name = $mixinName;
$mixin->args = $args;
return true;
}
$this->seek($s);
if ($this->literal('@include') &&
$this->keyword($mixinName) &&
($this->literal('(') &&
($this->argValues($argValues) || true) &&
$this->literal(')') || true) &&
($this->end() ||
$this->literal('{') && $hasBlock = true)
) {
$child = [Type::T_INCLUDE, $mixinName, isset($argValues) ? $argValues : null, null];
if (! empty($hasBlock)) {
$include = $this->pushSpecialBlock(Type::T_INCLUDE, $s);
$include->child = $child;
} else {
$this->append($child, $s);
}
return true;
}
$this->seek($s);
if ($this->literal('@scssphp-import-once') &&
$this->valueList($importPath) &&
$this->end()
) {
$this->append([Type::T_SCSSPHP_IMPORT_ONCE, $importPath], $s);
return true;
}
$this->seek($s);
if ($this->literal('@import') &&
$this->valueList($importPath) &&
$this->end()
) {
$this->append([Type::T_IMPORT, $importPath], $s);
return true;
}
$this->seek($s);
if ($this->literal('@import') &&
$this->url($importPath) &&
$this->end()
) {
$this->append([Type::T_IMPORT, $importPath], $s);
return true;
}
$this->seek($s);
if ($this->literal('@extend') &&
$this->selectors($selectors) &&
$this->end()
) {
// check for '!flag'
$optional = $this->stripOptionalFlag($selectors);
$this->append([Type::T_EXTEND, $selectors, $optional], $s);
return true;
}
$this->seek($s);
if ($this->literal('@function') &&
$this->keyword($fnName) &&
$this->argumentDef($args) &&
$this->literal('{')
) {
$func = $this->pushSpecialBlock(Type::T_FUNCTION, $s);
$func->name = $fnName;
$func->args = $args;
return true;
}
$this->seek($s);
if ($this->literal('@break') && $this->end()) {
$this->append([Type::T_BREAK], $s);
return true;
}
$this->seek($s);
if ($this->literal('@continue') && $this->end()) {
$this->append([Type::T_CONTINUE], $s);
return true;
}
$this->seek($s);
if ($this->literal('@return') && ($this->valueList($retVal) || true) && $this->end()) {
$this->append([Type::T_RETURN, isset($retVal) ? $retVal : [Type::T_NULL]], $s);
return true;
}
$this->seek($s);
if ($this->literal('@each') &&
$this->genericList($varNames, 'variable', ',', false) &&
$this->literal('in') &&
$this->valueList($list) &&
$this->literal('{')
) {
$each = $this->pushSpecialBlock(Type::T_EACH, $s);
foreach ($varNames[2] as $varName) {
$each->vars[] = $varName[1];
}
$each->list = $list;
return true;
}
$this->seek($s);
if ($this->literal('@while') &&
$this->expression($cond) &&
$this->literal('{')
) {
$while = $this->pushSpecialBlock(Type::T_WHILE, $s);
$while->cond = $cond;
return true;
}
$this->seek($s);
if ($this->literal('@for') &&
$this->variable($varName) &&
$this->literal('from') &&
$this->expression($start) &&
($this->literal('through') ||
($forUntil = true && $this->literal('to'))) &&
$this->expression($end) &&
$this->literal('{')
) {
$for = $this->pushSpecialBlock(Type::T_FOR, $s);
$for->var = $varName[1];
$for->start = $start;
$for->end = $end;
$for->until = isset($forUntil);
return true;
}
$this->seek($s);
if ($this->literal('@if') && $this->valueList($cond) && $this->literal('{')) {
$if = $this->pushSpecialBlock(Type::T_IF, $s);
$if->cond = $cond;
$if->cases = [];
return true;
}
$this->seek($s);
if ($this->literal('@debug') &&
$this->valueList($value) &&
$this->end()
) {
$this->append([Type::T_DEBUG, $value], $s);
return true;
}
$this->seek($s);
if ($this->literal('@warn') &&
$this->valueList($value) &&
$this->end()
) {
$this->append([Type::T_WARN, $value], $s);
return true;
}
$this->seek($s);
if ($this->literal('@error') &&
$this->valueList($value) &&
$this->end()
) {
$this->append([Type::T_ERROR, $value], $s);
return true;
}
$this->seek($s);
if ($this->literal('@content') && $this->end()) {
$this->append([Type::T_MIXIN_CONTENT], $s);
return true;
}
$this->seek($s);
$last = $this->last();
if (isset($last) && $last[0] === Type::T_IF) {
list(, $if) = $last;
if ($this->literal('@else')) {
if ($this->literal('{')) {
$else = $this->pushSpecialBlock(Type::T_ELSE, $s);
} elseif ($this->literal('if') && $this->valueList($cond) && $this->literal('{')) {
$else = $this->pushSpecialBlock(Type::T_ELSEIF, $s);
$else->cond = $cond;
}
if (isset($else)) {
$else->dontAppend = true;
$if->cases[] = $else;
return true;
}
}
$this->seek($s);
}
// only retain the first @charset directive encountered
if ($this->literal('@charset') &&
$this->valueList($charset) &&
$this->end()
) {
if (! isset($this->charset)) {
$statement = [Type::T_CHARSET, $charset];
list($line, $column) = $this->getSourcePosition($s);
$statement[static::SOURCE_LINE] = $line;
$statement[static::SOURCE_COLUMN] = $column;
$statement[static::SOURCE_INDEX] = $this->sourceIndex;
$this->charset = $statement;
}
return true;
}
$this->seek($s);
// doesn't match built in directive, do generic one
if ($this->literal('@', false) &&
$this->keyword($dirName) &&
($this->variable($dirValue) || $this->openString('{', $dirValue) || true) &&
$this->literal('{')
) {
if ($dirName === 'media') {
$directive = $this->pushSpecialBlock(Type::T_MEDIA, $s);
} else {
$directive = $this->pushSpecialBlock(Type::T_DIRECTIVE, $s);
$directive->name = $dirName;
}
if (isset($dirValue)) {
$directive->value = $dirValue;
}
return true;
}
$this->seek($s);
return false;
}
// property shortcut
// captures most properties before having to parse a selector
if ($this->keyword($name, false) &&
$this->literal(': ') &&
$this->valueList($value) &&
$this->end()
) {
$name = [Type::T_STRING, '', [$name]];
$this->append([Type::T_ASSIGN, $name, $value], $s);
return true;
}
$this->seek($s);
// variable assigns
if ($this->variable($name) &&
$this->literal(':') &&
$this->valueList($value) &&
$this->end()
) {
// check for '!flag'
$assignmentFlags = $this->stripAssignmentFlags($value);
$this->append([Type::T_ASSIGN, $name, $value, $assignmentFlags], $s);
return true;
}
$this->seek($s);
// misc
if ($this->literal('-->')) {
return true;
}
// opening css block
if ($this->selectors($selectors) && $this->literal('{')) {
$this->pushBlock($selectors, $s);
return true;
}
$this->seek($s);
// property assign, or nested assign
if ($this->propertyName($name) && $this->literal(':')) {
$foundSomething = false;
if ($this->valueList($value)) {
$this->append([Type::T_ASSIGN, $name, $value], $s);
$foundSomething = true;
}
if ($this->literal('{')) {
$propBlock = $this->pushSpecialBlock(Type::T_NESTED_PROPERTY, $s);
$propBlock->prefix = $name;
$foundSomething = true;
} elseif ($foundSomething) {
$foundSomething = $this->end();
}
if ($foundSomething) {
return true;
}
}
$this->seek($s);
// closing a block
if ($this->literal('}')) {
$block = $this->popBlock();
if (isset($block->type) && $block->type === Type::T_INCLUDE) {
$include = $block->child;
unset($block->child);
$include[3] = $block;
$this->append($include, $s);
} elseif (empty($block->dontAppend)) {
$type = isset($block->type) ? $block->type : Type::T_BLOCK;
$this->append([$type, $block], $s);
}
return true;
}
// extra stuff
if ($this->literal(';') ||
$this->literal('<!--')
) {
return true;
}
return false;
}
/**
* Push block onto parse tree
*
* @param array $selectors
* @param integer $pos
*
* @return \Leafo\ScssPhp\Block
*/
protected function pushBlock($selectors, $pos = 0)
{
list($line, $column) = $this->getSourcePosition($pos);
$b = new Block;
$b->sourceLine = $line;
$b->sourceColumn = $column;
$b->sourceIndex = $this->sourceIndex;
$b->selectors = $selectors;
$b->comments = [];
$b->parent = $this->env;
if (! $this->env) {
$b->children = [];
} elseif (empty($this->env->children)) {
$this->env->children = $this->env->comments;
$b->children = [];
$this->env->comments = [];
} else {
$b->children = $this->env->comments;
$this->env->comments = [];
}
$this->env = $b;
return $b;
}
/**
* Push special (named) block onto parse tree
*
* @param string $type
* @param integer $pos
*
* @return \Leafo\ScssPhp\Block
*/
protected function pushSpecialBlock($type, $pos)
{
$block = $this->pushBlock(null, $pos);
$block->type = $type;
return $block;
}
/**
* Pop scope and return last block
*
* @return \Leafo\ScssPhp\Block
*
* @throws \Exception
*/
protected function popBlock()
{
$block = $this->env;
if (empty($block->parent)) {
$this->throwParseError('unexpected }');
}
$this->env = $block->parent;
unset($block->parent);
$comments = $block->comments;
if (count($comments)) {
$this->env->comments = $comments;
unset($block->comments);
}
return $block;
}
/**
* Peek input stream
*
* @param string $regex
* @param array $out
* @param integer $from
*
* @return integer
*/
protected function peek($regex, &$out, $from = null)
{
if (! isset($from)) {
$from = $this->count;
}
$r = '/' . $regex . '/' . $this->patternModifiers;
$result = preg_match($r, $this->buffer, $out, null, $from);
return $result;
}
/**
* Seek to position in input stream (or return current position in input stream)
*
* @param integer $where
*
* @return integer
*/
protected function seek($where = null)
{
if ($where === null) {
return $this->count;
}
$this->count = $where;
return true;
}
/**
* Match string looking for either ending delim, escape, or string interpolation
*
* {@internal This is a workaround for preg_match's 250K string match limit. }}
*
* @param array $m Matches (passed by reference)
* @param string $delim Delimeter
*
* @return boolean True if match; false otherwise
*/
protected function matchString(&$m, $delim)
{
$token = null;
$end = strlen($this->buffer);
// look for either ending delim, escape, or string interpolation
foreach (['#{', '\\', $delim] as $lookahead) {
$pos = strpos($this->buffer, $lookahead, $this->count);
if ($pos !== false && $pos < $end) {
$end = $pos;
$token = $lookahead;
}
}
if (! isset($token)) {
return false;
}
$match = substr($this->buffer, $this->count, $end - $this->count);
$m = [
$match . $token,
$match,
$token
];
$this->count = $end + strlen($token);
return true;
}
/**
* Try to match something on head of buffer
*
* @param string $regex
* @param array $out
* @param boolean $eatWhitespace
*
* @return boolean
*/
protected function match($regex, &$out, $eatWhitespace = null)
{
if (! isset($eatWhitespace)) {
$eatWhitespace = $this->eatWhiteDefault;
}
$r = '/' . $regex . '/' . $this->patternModifiers;
if (preg_match($r, $this->buffer, $out, null, $this->count)) {
$this->count += strlen($out[0]);
if ($eatWhitespace) {
$this->whitespace();
}
return true;
}
return false;
}
/**
* Match literal string
*
* @param string $what
* @param boolean $eatWhitespace
*
* @return boolean
*/
protected function literal($what, $eatWhitespace = null)
{
if (! isset($eatWhitespace)) {
$eatWhitespace = $this->eatWhiteDefault;
}
$len = strlen($what);
if (strcasecmp(substr($this->buffer, $this->count, $len), $what) === 0) {
$this->count += $len;
if ($eatWhitespace) {
$this->whitespace();
}
return true;
}
return false;
}
/**
* Match some whitespace
*
* @return boolean
*/
protected function whitespace()
{
$gotWhite = false;
while (preg_match(static::$whitePattern, $this->buffer, $m, null, $this->count)) {
if (isset($m[1]) && empty($this->commentsSeen[$this->count])) {
$this->appendComment([Type::T_COMMENT, $m[1]]);
$this->commentsSeen[$this->count] = true;
}
$this->count += strlen($m[0]);
$gotWhite = true;
}
return $gotWhite;
}
/**
* Append comment to current block
*
* @param array $comment
*/
protected function appendComment($comment)
{
$comment[1] = substr(preg_replace(['/^\s+/m', '/^(.)/m'], ['', ' \1'], $comment[1]), 1);
$this->env->comments[] = $comment;
}
/**
* Append statement to current block
*
* @param array $statement
* @param integer $pos
*/
protected function append($statement, $pos = null)
{
if ($pos !== null) {
list($line, $column) = $this->getSourcePosition($pos);
$statement[static::SOURCE_LINE] = $line;
$statement[static::SOURCE_COLUMN] = $column;
$statement[static::SOURCE_INDEX] = $this->sourceIndex;
}
$this->env->children[] = $statement;
$comments = $this->env->comments;
if (count($comments)) {
$this->env->children = array_merge($this->env->children, $comments);
$this->env->comments = [];
}
}
/**
* Returns last child was appended
*
* @return array|null
*/
protected function last()
{
$i = count($this->env->children) - 1;
if (isset($this->env->children[$i])) {
return $this->env->children[$i];
}
}
/**
* Parse media query list
*
* @param array $out
*
* @return boolean
*/
protected function mediaQueryList(&$out)
{
return $this->genericList($out, 'mediaQuery', ',', false);
}
/**
* Parse media query
*
* @param array $out
*
* @return boolean
*/
protected function mediaQuery(&$out)
{
$expressions = null;
$parts = [];
if (($this->literal('only') && ($only = true) || $this->literal('not') && ($not = true) || true) &&
$this->mixedKeyword($mediaType)
) {
$prop = [Type::T_MEDIA_TYPE];
if (isset($only)) {
$prop[] = [Type::T_KEYWORD, 'only'];
}
if (isset($not)) {
$prop[] = [Type::T_KEYWORD, 'not'];
}
$media = [Type::T_LIST, '', []];
foreach ((array) $mediaType as $type) {
if (is_array($type)) {
$media[2][] = $type;
} else {
$media[2][] = [Type::T_KEYWORD, $type];
}
}
$prop[] = $media;
$parts[] = $prop;
}
if (empty($parts) || $this->literal('and')) {
$this->genericList($expressions, 'mediaExpression', 'and', false);
if (is_array($expressions)) {
$parts = array_merge($parts, $expressions[2]);
}
}
$out = $parts;
return true;
}
/**
* Parse media expression
*
* @param array $out
*
* @return boolean
*/
protected function mediaExpression(&$out)
{
$s = $this->seek();
$value = null;
if ($this->literal('(') &&
$this->expression($feature) &&
($this->literal(':') && $this->expression($value) || true) &&
$this->literal(')')
) {
$out = [Type::T_MEDIA_EXPRESSION, $feature];
if ($value) {
$out[] = $value;
}
return true;
}
$this->seek($s);
return false;
}
/**
* Parse argument values
*
* @param array $out
*
* @return boolean
*/
protected function argValues(&$out)
{
if ($this->genericList($list, 'argValue', ',', false)) {
$out = $list[2];
return true;
}
return false;
}
/**
* Parse argument value
*
* @param array $out
*
* @return boolean
*/
protected function argValue(&$out)
{
$s = $this->seek();
$keyword = null;
if (! $this->variable($keyword) || ! $this->literal(':')) {
$this->seek($s);
$keyword = null;
}
if ($this->genericList($value, 'expression')) {
$out = [$keyword, $value, false];
$s = $this->seek();
if ($this->literal('...')) {
$out[2] = true;
} else {
$this->seek($s);
}
return true;
}
return false;
}
/**
* Parse comma separated value list
*
* @param string $out
*
* @return boolean
*/
protected function valueList(&$out)
{
return $this->genericList($out, 'spaceList', ',');
}
/**
* Parse space separated value list
*
* @param array $out
*
* @return boolean
*/
protected function spaceList(&$out)
{
return $this->genericList($out, 'expression');
}
/**
* Parse generic list
*
* @param array $out
* @param callable $parseItem
* @param string $delim
* @param boolean $flatten
*
* @return boolean
*/
protected function genericList(&$out, $parseItem, $delim = '', $flatten = true)
{
$s = $this->seek();
$items = [];
while ($this->$parseItem($value)) {
$items[] = $value;
if ($delim) {
if (! $this->literal($delim)) {
break;
}
}
}
if (count($items) === 0) {
$this->seek($s);
return false;
}
if ($flatten && count($items) === 1) {
$out = $items[0];
} else {
$out = [Type::T_LIST, $delim, $items];
}
return true;
}
/**
* Parse expression
*
* @param array $out
*
* @return boolean
*/
protected function expression(&$out)
{
$s = $this->seek();
if ($this->literal('(')) {
if ($this->literal(')')) {
$out = [Type::T_LIST, '', []];
return true;
}
if ($this->valueList($out) && $this->literal(')') && $out[0] === Type::T_LIST) {
return true;
}
$this->seek($s);
if ($this->map($out)) {
return true;
}
$this->seek($s);
}
if ($this->value($lhs)) {
$out = $this->expHelper($lhs, 0);
return true;
}
return false;
}
/**
* Parse left-hand side of subexpression
*
* @param array $lhs
* @param integer $minP
*
* @return array
*/
protected function expHelper($lhs, $minP)
{
$operators = static::$operatorPattern;
$ss = $this->seek();
$whiteBefore = isset($this->buffer[$this->count - 1]) &&
ctype_space($this->buffer[$this->count - 1]);
while ($this->match($operators, $m, false) && static::$precedence[$m[1]] >= $minP) {
$whiteAfter = isset($this->buffer[$this->count]) &&
ctype_space($this->buffer[$this->count]);
$varAfter = isset($this->buffer[$this->count]) &&
$this->buffer[$this->count] === '$';
$this->whitespace();
$op = $m[1];
// don't turn negative numbers into expressions
if ($op === '-' && $whiteBefore && ! $whiteAfter && ! $varAfter) {
break;
}
if (! $this->value($rhs)) {
break;
}
// peek and see if rhs belongs to next operator
if ($this->peek($operators, $next) && static::$precedence[$next[1]] > static::$precedence[$op]) {
$rhs = $this->expHelper($rhs, static::$precedence[$next[1]]);
}
$lhs = [Type::T_EXPRESSION, $op, $lhs, $rhs, $this->inParens, $whiteBefore, $whiteAfter];
$ss = $this->seek();
$whiteBefore = isset($this->buffer[$this->count - 1]) &&
ctype_space($this->buffer[$this->count - 1]);
}
$this->seek($ss);
return $lhs;
}
/**
* Parse value
*
* @param array $out
*
* @return boolean
*/
protected function value(&$out)
{
$s = $this->seek();
if ($this->literal('not', false) && $this->whitespace() && $this->value($inner)) {
$out = [Type::T_UNARY, 'not', $inner, $this->inParens];
return true;
}
$this->seek($s);
if ($this->literal('not', false) && $this->parenValue($inner)) {
$out = [Type::T_UNARY, 'not', $inner, $this->inParens];
return true;
}
$this->seek($s);
if ($this->literal('+') && $this->value($inner)) {
$out = [Type::T_UNARY, '+', $inner, $this->inParens];
return true;
}
$this->seek($s);
// negation
if ($this->literal('-', false) &&
($this->variable($inner) ||
$this->unit($inner) ||
$this->parenValue($inner))
) {
$out = [Type::T_UNARY, '-', $inner, $this->inParens];
return true;
}
$this->seek($s);
if ($this->parenValue($out) ||
$this->interpolation($out) ||
$this->variable($out) ||
$this->color($out) ||
$this->unit($out) ||
$this->string($out) ||
$this->func($out) ||
$this->progid($out)
) {
return true;
}
if ($this->keyword($keyword)) {
if ($keyword === 'null') {
$out = [Type::T_NULL];
} else {
$out = [Type::T_KEYWORD, $keyword];
}
return true;
}
return false;
}
/**
* Parse parenthesized value
*
* @param array $out
*
* @return boolean
*/
protected function parenValue(&$out)
{
$s = $this->seek();
$inParens = $this->inParens;
if ($this->literal('(')) {
if ($this->literal(')')) {
$out = [Type::T_LIST, '', []];
return true;
}
$this->inParens = true;
if ($this->expression($exp) && $this->literal(')')) {
$out = $exp;
$this->inParens = $inParens;
return true;
}
}
$this->inParens = $inParens;
$this->seek($s);
return false;
}
/**
* Parse "progid:"
*
* @param array $out
*
* @return boolean
*/
protected function progid(&$out)
{
$s = $this->seek();
if ($this->literal('progid:', false) &&
$this->openString('(', $fn) &&
$this->literal('(')
) {
$this->openString(')', $args, '(');
if ($this->literal(')')) {
$out = [Type::T_STRING, '', [
'progid:', $fn, '(', $args, ')'
]];
return true;
}
}
$this->seek($s);
return false;
}
/**
* Parse function call
*
* @param array $out
*
* @return boolean
*/
protected function func(&$func)
{
$s = $this->seek();
if ($this->keyword($name, false) &&
$this->literal('(')
) {
if ($name === 'alpha' && $this->argumentList($args)) {
$func = [Type::T_FUNCTION, $name, [Type::T_STRING, '', $args]];
return true;
}
if ($name !== 'expression' && ! preg_match('/^(-[a-z]+-)?calc$/', $name)) {
$ss = $this->seek();
if ($this->argValues($args) && $this->literal(')')) {
$func = [Type::T_FUNCTION_CALL, $name, $args];
return true;
}
$this->seek($ss);
}
if (($this->openString(')', $str, '(') || true) &&
$this->literal(')')
) {
$args = [];
if (! empty($str)) {
$args[] = [null, [Type::T_STRING, '', [$str]]];
}
$func = [Type::T_FUNCTION_CALL, $name, $args];
return true;
}
}
$this->seek($s);
return false;
}
/**
* Parse function call argument list
*
* @param array $out
*
* @return boolean
*/
protected function argumentList(&$out)
{
$s = $this->seek();
$this->literal('(');
$args = [];
while ($this->keyword($var)) {
if ($this->literal('=') && $this->expression($exp)) {
$args[] = [Type::T_STRING, '', [$var . '=']];
$arg = $exp;
} else {
break;
}
$args[] = $arg;
if (! $this->literal(',')) {
break;
}
$args[] = [Type::T_STRING, '', [', ']];
}
if (! $this->literal(')') || ! count($args)) {
$this->seek($s);
return false;
}
$out = $args;
return true;
}
/**
* Parse mixin/function definition argument list
*
* @param array $out
*
* @return boolean
*/
protected function argumentDef(&$out)
{
$s = $this->seek();
$this->literal('(');
$args = [];
while ($this->variable($var)) {
$arg = [$var[1], null, false];
$ss = $this->seek();
if ($this->literal(':') && $this->genericList($defaultVal, 'expression')) {
$arg[1] = $defaultVal;
} else {
$this->seek($ss);
}
$ss = $this->seek();
if ($this->literal('...')) {
$sss = $this->seek();
if (! $this->literal(')')) {
$this->throwParseError('... has to be after the final argument');
}
$arg[2] = true;
$this->seek($sss);
} else {
$this->seek($ss);
}
$args[] = $arg;
if (! $this->literal(',')) {
break;
}
}
if (! $this->literal(')')) {
$this->seek($s);
return false;
}
$out = $args;
return true;
}
/**
* Parse map
*
* @param array $out
*
* @return boolean
*/
protected function map(&$out)
{
$s = $this->seek();
if (! $this->literal('(')) {
return false;
}
$keys = [];
$values = [];
while ($this->genericList($key, 'expression') && $this->literal(':') &&
$this->genericList($value, 'expression')
) {
$keys[] = $key;
$values[] = $value;
if (! $this->literal(',')) {
break;
}
}
if (! count($keys) || ! $this->literal(')')) {
$this->seek($s);
return false;
}
$out = [Type::T_MAP, $keys, $values];
return true;
}
/**
* Parse color
*
* @param array $out
*
* @return boolean
*/
protected function color(&$out)
{
$color = [Type::T_COLOR];
if ($this->match('(#([0-9a-f]{6})|#([0-9a-f]{3}))', $m)) {
if (isset($m[3])) {
$num = hexdec($m[3]);
foreach ([3, 2, 1] as $i) {
$t = $num & 0xf;
$color[$i] = $t << 4 | $t;
$num >>= 4;
}
} else {
$num = hexdec($m[2]);
foreach ([3, 2, 1] as $i) {
$color[$i] = $num & 0xff;
$num >>= 8;
}
}
$out = $color;
return true;
}
return false;
}
/**
* Parse number with unit
*
* @param array $out
*
* @return boolean
*/
protected function unit(&$unit)
{
if ($this->match('([0-9]*(\.)?[0-9]+)([%a-zA-Z]+)?', $m)) {
$unit = new Node\Number($m[1], empty($m[3]) ? '' : $m[3]);
return true;
}
return false;
}
/**
* Parse string
*
* @param array $out
*
* @return boolean
*/
protected function string(&$out)
{
$s = $this->seek();
if ($this->literal('"', false)) {
$delim = '"';
} elseif ($this->literal("'", false)) {
$delim = "'";
} else {
return false;
}
$content = [];
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
$hasInterpolation = false;
while ($this->matchString($m, $delim)) {
if ($m[1] !== '') {
$content[] = $m[1];
}
if ($m[2] === '#{') {
$this->count -= strlen($m[2]);
if ($this->interpolation($inter, false)) {
$content[] = $inter;
$hasInterpolation = true;
} else {
$this->count += strlen($m[2]);
$content[] = '#{'; // ignore it
}
} elseif ($m[2] === '\\') {
if ($this->literal('"', false)) {
$content[] = $m[2] . '"';
} elseif ($this->literal("'", false)) {
$content[] = $m[2] . "'";
} else {
$content[] = $m[2];
}
} else {
$this->count -= strlen($delim);
break; // delim
}
}
$this->eatWhiteDefault = $oldWhite;
if ($this->literal($delim)) {
if ($hasInterpolation) {
$delim = '"';
foreach ($content as &$string) {
if ($string === "\\'") {
$string = "'";
} elseif ($string === '\\"') {
$string = '"';
}
}
}
$out = [Type::T_STRING, $delim, $content];
return true;
}
$this->seek($s);
return false;
}
/**
* Parse keyword or interpolation
*
* @param array $out
*
* @return boolean
*/
protected function mixedKeyword(&$out)
{
$parts = [];
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
for (;;) {
if ($this->keyword($key)) {
$parts[] = $key;
continue;
}
if ($this->interpolation($inter)) {
$parts[] = $inter;
continue;
}
break;
}
$this->eatWhiteDefault = $oldWhite;
if (count($parts) === 0) {
return false;
}
if ($this->eatWhiteDefault) {
$this->whitespace();
}
$out = $parts;
return true;
}
/**
* Parse an unbounded string stopped by $end
*
* @param string $end
* @param array $out
* @param string $nestingOpen
*
* @return boolean
*/
protected function openString($end, &$out, $nestingOpen = null)
{
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
$patt = '(.*?)([\'"]|#\{|' . $this->pregQuote($end) . '|' . static::$commentPattern . ')';
$nestingLevel = 0;
$content = [];
while ($this->match($patt, $m, false)) {
if (isset($m[1]) && $m[1] !== '') {
$content[] = $m[1];
if ($nestingOpen) {
$nestingLevel += substr_count($m[1], $nestingOpen);
}
}
$tok = $m[2];
$this->count-= strlen($tok);
if ($tok === $end && ! $nestingLevel--) {
break;
}
if (($tok === "'" || $tok === '"') && $this->string($str)) {
$content[] = $str;
continue;
}
if ($tok === '#{' && $this->interpolation($inter)) {
$content[] = $inter;
continue;
}
$content[] = $tok;
$this->count+= strlen($tok);
}
$this->eatWhiteDefault = $oldWhite;
if (count($content) === 0) {
return false;
}
// trim the end
if (is_string(end($content))) {
$content[count($content) - 1] = rtrim(end($content));
}
$out = [Type::T_STRING, '', $content];
return true;
}
/**
* Parser interpolation
*
* @param array $out
* @param boolean $lookWhite save information about whitespace before and after
*
* @return boolean
*/
protected function interpolation(&$out, $lookWhite = true)
{
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = true;
$s = $this->seek();
if ($this->literal('#{') && $this->valueList($value) && $this->literal('}', false)) {
if ($lookWhite) {
$left = preg_match('/\s/', $this->buffer[$s - 1]) ? ' ' : '';
$right = preg_match('/\s/', $this->buffer[$this->count]) ? ' ': '';
} else {
$left = $right = false;
}
$out = [Type::T_INTERPOLATE, $value, $left, $right];
$this->eatWhiteDefault = $oldWhite;
if ($this->eatWhiteDefault) {
$this->whitespace();
}
return true;
}
$this->seek($s);
$this->eatWhiteDefault = $oldWhite;
return false;
}
/**
* Parse property name (as an array of parts or a string)
*
* @param array $out
*
* @return boolean
*/
protected function propertyName(&$out)
{
$parts = [];
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
for (;;) {
if ($this->interpolation($inter)) {
$parts[] = $inter;
continue;
}
if ($this->keyword($text)) {
$parts[] = $text;
continue;
}
if (count($parts) === 0 && $this->match('[:.#]', $m, false)) {
// css hacks
$parts[] = $m[0];
continue;
}
break;
}
$this->eatWhiteDefault = $oldWhite;
if (count($parts) === 0) {
return false;
}
// match comment hack
if (preg_match(
static::$whitePattern,
$this->buffer,
$m,
null,
$this->count
)) {
if (! empty($m[0])) {
$parts[] = $m[0];
$this->count += strlen($m[0]);
}
}
$this->whitespace(); // get any extra whitespace
$out = [Type::T_STRING, '', $parts];
return true;
}
/**
* Parse comma separated selector list
*
* @param array $out
*
* @return boolean
*/
protected function selectors(&$out)
{
$s = $this->seek();
$selectors = [];
while ($this->selector($sel)) {
$selectors[] = $sel;
if (! $this->literal(',')) {
break;
}
while ($this->literal(',')) {
; // ignore extra
}
}
if (count($selectors) === 0) {
$this->seek($s);
return false;
}
$out = $selectors;
return true;
}
/**
* Parse whitespace separated selector list
*
* @param array $out
*
* @return boolean
*/
protected function selector(&$out)
{
$selector = [];
for (;;) {
if ($this->match('[>+~]+', $m)) {
$selector[] = [$m[0]];
continue;
}
if ($this->selectorSingle($part)) {
$selector[] = $part;
$this->match('\s+', $m);
continue;
}
if ($this->match('\/[^\/]+\/', $m)) {
$selector[] = [$m[0]];
continue;
}
break;
}
if (count($selector) === 0) {
return false;
}
$out = $selector;
return true;
}
/**
* Parse the parts that make up a selector
*
* {@internal
* div[yes=no]#something.hello.world:nth-child(-2n+1)%placeholder
* }}
*
* @param array $out
*
* @return boolean
*/
protected function selectorSingle(&$out)
{
$oldWhite = $this->eatWhiteDefault;
$this->eatWhiteDefault = false;
$parts = [];
if ($this->literal('*', false)) {
$parts[] = '*';
}
for (;;) {
// see if we can stop early
if ($this->match('\s*[{,]', $m)) {
$this->count--;
break;
}
$s = $this->seek();
// self
if ($this->literal('&', false)) {
$parts[] = Compiler::$selfSelector;
continue;
}
if ($this->literal('.', false)) {
$parts[] = '.';
continue;
}
if ($this->literal('|', false)) {
$parts[] = '|';
continue;
}
if ($this->match('\\\\\S', $m)) {
$parts[] = $m[0];
continue;
}
// for keyframes
if ($this->unit($unit)) {
$parts[] = $unit;
continue;
}
if ($this->keyword($name)) {
$parts[] = $name;
continue;
}
if ($this->interpolation($inter)) {
$parts[] = $inter;
continue;
}
if ($this->literal('%', false) && $this->placeholder($placeholder)) {
$parts[] = '%';
$parts[] = $placeholder;
continue;
}
if ($this->literal('#', false)) {
$parts[] = '#';
continue;
}
// a pseudo selector
if ($this->match('::?', $m) && $this->mixedKeyword($nameParts)) {
$parts[] = $m[0];
foreach ($nameParts as $sub) {
$parts[] = $sub;
}
$ss = $this->seek();
if ($this->literal('(') &&
($this->openString(')', $str, '(') || true) &&
$this->literal(')')
) {
$parts[] = '(';
if (! empty($str)) {
$parts[] = $str;
}
$parts[] = ')';
} else {
$this->seek($ss);
}
continue;
}
$this->seek($s);
// attribute selector
if ($this->literal('[') &&
($this->openString(']', $str, '[') || true) &&
$this->literal(']')
) {
$parts[] = '[';
if (! empty($str)) {
$parts[] = $str;
}
$parts[] = ']';
continue;
}
$this->seek($s);
break;
}
$this->eatWhiteDefault = $oldWhite;
if (count($parts) === 0) {
return false;
}
$out = $parts;
return true;
}
/**
* Parse a variable
*
* @param array $out
*
* @return boolean
*/
protected function variable(&$out)
{
$s = $this->seek();
if ($this->literal('$', false) && $this->keyword($name)) {
$out = [Type::T_VARIABLE, $name];
return true;
}
$this->seek($s);
return false;
}
/**
* Parse a keyword
*
* @param string $word
* @param boolean $eatWhitespace
*
* @return boolean
*/
protected function keyword(&$word, $eatWhitespace = null)
{
if ($this->match(
$this->utf8
? '(([\pL\w_\-\*!"\']|[\\\\].)([\pL\w\-_"\']|[\\\\].)*)'
: '(([\w_\-\*!"\']|[\\\\].)([\w\-_"\']|[\\\\].)*)',
$m,
$eatWhitespace
)) {
$word = $m[1];
return true;
}
return false;
}
/**
* Parse a placeholder
*
* @param string $placeholder
*
* @return boolean
*/
protected function placeholder(&$placeholder)
{
if ($this->match(
$this->utf8
? '([\pL\w\-_]+|#[{][$][\pL\w\-_]+[}])'
: '([\w\-_]+|#[{][$][\w\-_]+[}])',
$m
)) {
$placeholder = $m[1];
return true;
}
return false;
}
/**
* Parse a url
*
* @param array $out
*
* @return boolean
*/
protected function url(&$out)
{
if ($this->match('(url\(\s*(["\']?)([^)]+)\2\s*\))', $m)) {
$out = [Type::T_STRING, '', ['url(' . $m[2] . $m[3] . $m[2] . ')']];
return true;
}
return false;
}
/**
* Consume an end of statement delimiter
*
* @return boolean
*/
protected function end()
{
if ($this->literal(';')) {
return true;
}
if ($this->count === strlen($this->buffer) || $this->buffer[$this->count] === '}') {
// if there is end of file or a closing block next then we don't need a ;
return true;
}
return false;
}
/**
* Strip assignment flag from the list
*
* @param array $value
*
* @return array
*/
protected function stripAssignmentFlags(&$value)
{
$flags = [];
for ($token = &$value; $token[0] === Type::T_LIST && ($s = count($token[2])); $token = &$lastNode) {
$lastNode = &$token[2][$s - 1];
while ($lastNode[0] === Type::T_KEYWORD && in_array($lastNode[1], ['!default', '!global'])) {
array_pop($token[2]);
$node = end($token[2]);
$token = $this->flattenList($token);
$flags[] = $lastNode[1];
$lastNode = $node;
}
}
return $flags;
}
/**
* Strip optional flag from selector list
*
* @param array $selectors
*
* @return string
*/
protected function stripOptionalFlag(&$selectors)
{
$optional = false;
$selector = end($selectors);
$part = end($selector);
if ($part === ['!optional']) {
array_pop($selectors[count($selectors) - 1]);
$optional = true;
}
return $optional;
}
/**
* Turn list of length 1 into value type
*
* @param array $value
*
* @return array
*/
protected function flattenList($value)
{
if ($value[0] === Type::T_LIST && count($value[2]) === 1) {
return $this->flattenList($value[2][0]);
}
return $value;
}
/**
* @deprecated
*
* {@internal
* advance counter to next occurrence of $what
* $until - don't include $what in advance
* $allowNewline, if string, will be used as valid char set
* }}
*/
protected function to($what, &$out, $until = false, $allowNewline = false)
{
if (is_string($allowNewline)) {
$validChars = $allowNewline;
} else {
$validChars = $allowNewline ? '.' : "[^\n]";
}
if (! $this->match('(' . $validChars . '*?)' . $this->pregQuote($what), $m, ! $until)) {
return false;
}
if ($until) {
$this->count -= strlen($what); // give back $what
}
$out = $m[1];
return true;
}
/**
* @deprecated
*/
protected function show()
{
if ($this->peek("(.*?)(\n|$)", $m, $this->count)) {
return $m[1];
}
return '';
}
/**
* Quote regular expression
*
* @param string $what
*
* @return string
*/
private function pregQuote($what)
{
return preg_quote($what, '/');
}
/**
* Extract line numbers from buffer
*
* @param string $buffer
*/
private function extractLineNumbers($buffer)
{
$this->sourcePositions = [0 => 0];
$prev = 0;
while (($pos = strpos($buffer, "\n", $prev)) !== false) {
$this->sourcePositions[] = $pos;
$prev = $pos + 1;
}
$this->sourcePositions[] = strlen($buffer);
if (substr($buffer, -1) !== "\n") {
$this->sourcePositions[] = strlen($buffer) + 1;
}
}
/**
* Get source line number and column (given character position in the buffer)
*
* @param integer $pos
*
* @return integer
*/
private function getSourcePosition($pos)
{
$low = 0;
$high = count($this->sourcePositions);
while ($low < $high) {
$mid = (int) (($high + $low) / 2);
if ($pos < $this->sourcePositions[$mid]) {
$high = $mid - 1;
continue;
}
if ($pos >= $this->sourcePositions[$mid + 1]) {
$low = $mid + 1;
continue;
}
return [$mid + 1, $pos - $this->sourcePositions[$mid]];
}
return [$low + 1, $pos - $this->sourcePositions[$low]];
}
/**
* Save internal encoding
*/
private function saveEncoding()
{
if (version_compare(PHP_VERSION, '7.2.0') >= 0) {
return;
}
$iniDirective = 'mbstring' . '.func_overload'; // deprecated in PHP 7.2
if (ini_get($iniDirective) & 2) {
$this->encoding = mb_internal_encoding();
mb_internal_encoding('iso-8859-1');
}
}
/**
* Restore internal encoding
*/
private function restoreEncoding()
{
if ($this->encoding) {
mb_internal_encoding($this->encoding);
}
}
}