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Developer Documentation
- Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
- Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
- PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
/lib/scssphp/ -> Parser.php (source)
Differences Between: [Versions 310 and 311] [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 and 403] [Versions 39 and 311]
SCSSPHP
| Copyright: | 2012-2020 Leaf Corcoran |
| License: | http://opensource.org/licenses/MIT MIT |
| File Size: | 4097 lines (111 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
Parser:: (73 methods):
__construct()
getSourceName()
throwParseError()
parseError()
parse()
parseValue()
parseSelector()
parseMediaQueryList()
parseChunk()
pushBlock()
pushSpecialBlock()
popBlock()
peek()
seek()
assertPlainCssValid()
isPlainCssValidElement()
matchString()
match()
matchChar()
literal()
whitespace()
appendComment()
append()
last()
mediaQueryList()
mediaQuery()
supportsQuery()
mediaExpression()
argValues()
argValue()
isKnownGenericDirective()
directiveValue()
valueList()
functionCallArgumentsList()
spaceList()
genericList()
expression()
enclosedExpression()
expHelper()
value()
parenValue()
progid()
func()
argumentList()
argumentDef()
map()
color()
unit()
string()
matchEscapeCharacter()
mixedKeyword()
openString()
interpolation()
propertyName()
customProperty()
selectors()
selector()
matchEscapeCharacterInSelector()
selectorSingle()
variable()
keyword()
restrictedKeyword()
placeholder()
url()
end()
stripAssignmentFlags()
stripOptionalFlag()
flattenList()
pregQuote()
extractLineNumbers()
getSourcePosition()
saveEncoding()
restoreEncoding()
Parser
| __construct($sourceName, $sourceIndex = 0, $encoding = 'utf-8', Cache $cache = null, $cssOnly = false) X-Ref |
| Constructor param: string $sourceName param: integer $sourceIndex param: string|null $encoding param: Cache|null $cache param: bool $cssOnly |
| getSourceName() X-Ref |
| Get source file name return: string |
| throwParseError($msg = 'parse error') X-Ref |
| Throw parser error param: string $msg |
| parseError($msg = 'parse error') X-Ref |
| Creates a parser error param: string $msg return: ParserException |
| parse($buffer) X-Ref |
| Parser buffer param: string $buffer return: Block |
| parseValue($buffer, &$out) X-Ref |
| Parse a value or value list param: string $buffer param: string|array $out return: boolean |
| parseSelector($buffer, &$out, $shouldValidate = true) X-Ref |
| Parse a selector or selector list param: string $buffer param: string|array $out param: bool $shouldValidate return: boolean |
| parseMediaQueryList($buffer, &$out) X-Ref |
| Parse a media Query param: string $buffer param: string|array $out return: boolean |
| parseChunk() X-Ref |
| 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->count to remember the current position into $s. Then if a chain fails, use $this->seek($s) to go back where we started. return: boolean |
| pushBlock($selectors, $pos = 0) X-Ref |
| Push block onto parse tree param: array|null $selectors param: integer $pos return: Block |
| pushSpecialBlock($type, $pos) X-Ref |
| Push special (named) block onto parse tree param: string $type param: integer $pos return: Block |
| popBlock() X-Ref |
| Pop scope and return last block return: Block |
| peek($regex, &$out, $from = null) X-Ref |
| Peek input stream param: string $regex param: array $out param: integer $from return: integer |
| seek($where) X-Ref |
| Seek to position in input stream (or return current position in input stream) param: integer $where |
| assertPlainCssValid($parsed, $startPos = null) X-Ref |
| Assert a parsed part is plain CSS Valid param: array|false $parsed param: int $startPos |
| isPlainCssValidElement($parsed, $allowExpression = false) X-Ref |
| Check a parsed element is plain CSS Valid param: array $parsed return: bool|array |
| matchString(&$m, $delim) X-Ref |
| 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 $delim Delimiter return: boolean True if match; false otherwise |
| match($regex, &$out, $eatWhitespace = null) X-Ref |
| Try to match something on head of buffer param: string $regex param: array $out param: boolean $eatWhitespace return: boolean |
| matchChar($char, $eatWhitespace = null) X-Ref |
| Match a single string param: string $char param: boolean $eatWhitespace return: boolean |
| literal($what, $len, $eatWhitespace = null) X-Ref |
| Match literal string param: string $what param: integer $len param: boolean $eatWhitespace return: boolean |
| whitespace() X-Ref |
| Match some whitespace return: boolean |
| appendComment($comment) X-Ref |
| Append comment to current block param: array $comment |
| append($statement, $pos = null) X-Ref |
| Append statement to current block param: array|null $statement param: integer $pos |
| last() X-Ref |
| Returns last child was appended return: array|null |
| mediaQueryList(&$out) X-Ref |
| Parse media query list param: array $out return: boolean |
| mediaQuery(&$out) X-Ref |
| Parse media query param: array $out return: boolean |
| supportsQuery(&$out) X-Ref |
| Parse supports query param: array $out return: boolean |
| mediaExpression(&$out) X-Ref |
| Parse media expression param: array $out return: boolean |
| argValues(&$out) X-Ref |
| Parse argument values param: array $out return: boolean |
| argValue(&$out) X-Ref |
| Parse argument value param: array $out return: boolean |
| isKnownGenericDirective($directiveName) X-Ref |
| Check if a generic directive is known to be able to allow almost any syntax or not param: mixed $directiveName return: bool |
| directiveValue(&$out, $endChar = false) X-Ref |
| Parse directive value list that considers $vars as keyword param: array $out param: boolean|string $endChar return: boolean |
| valueList(&$out) X-Ref |
| Parse comma separated value list param: array $out return: boolean |
| functionCallArgumentsList(&$out, $mandatoryEnclos = true, $charAfter = null, $eatWhiteSp = null) X-Ref |
| Parse a function call, where externals () are part of the call and not of the value list param: $out param: bool $mandatoryEnclos param: null|string $charAfter param: null|bool $eatWhiteSp return: bool |
| spaceList(&$out) X-Ref |
| Parse space separated value list param: array $out return: boolean |
| genericList(&$out, $parseItem, $delim = '', $flatten = true) X-Ref |
| Parse generic list param: array $out param: string $parseItem The name of the method used to parse items param: string $delim param: boolean $flatten return: boolean |
| expression(&$out, $listOnly = false, $lookForExp = true) X-Ref |
| Parse expression param: array $out param: boolean $listOnly param: boolean $lookForExp return: boolean |
| enclosedExpression(&$out, $s, $closingParen = ') X-Ref |
| Parse expression specifically checking for lists in parenthesis or brackets param: array $out param: integer $s param: string $closingParen param: array $allowedTypes return: boolean |
| expHelper($lhs, $minP) X-Ref |
| Parse left-hand side of subexpression param: array $lhs param: integer $minP return: array |
| value(&$out) X-Ref |
| Parse value param: array $out return: boolean |
| parenValue(&$out) X-Ref |
| Parse parenthesized value param: array $out return: boolean |
| progid(&$out) X-Ref |
| Parse "progid:" param: array $out return: boolean |
| func($name, &$func) X-Ref |
| Parse function call param: string $name param: array $func return: boolean |
| argumentList(&$out) X-Ref |
| Parse function call argument list param: array $out return: boolean |
| argumentDef(&$out) X-Ref |
| Parse mixin/function definition argument list param: array $out return: boolean |
| map(&$out) X-Ref |
| Parse map param: array $out return: boolean |
| color(&$out) X-Ref |
| Parse color param: array $out return: boolean |
| unit(&$unit) X-Ref |
| Parse number with unit param: array $unit return: boolean |
| string(&$out, $keepDelimWithInterpolation = false) X-Ref |
| Parse string param: array $out return: boolean |
| matchEscapeCharacter(&$out, $inKeywords = false) X-Ref |
param: string $out param: bool $inKeywords return: bool |
| mixedKeyword(&$out, $restricted = false) X-Ref |
| Parse keyword or interpolation param: array $out param: boolean $restricted return: boolean |
| openString($end, &$out, $nestOpen = null, $nestClose = null, $rtrim = true, $disallow = null) X-Ref |
| Parse an unbounded string stopped by $end param: string $end param: array $out param: string $nestOpen param: string $nestClose param: boolean $rtrim param: string $disallow return: boolean |
| interpolation(&$out, $lookWhite = true) X-Ref |
| Parser interpolation param: string|array $out param: boolean $lookWhite save information about whitespace before and after return: boolean |
| propertyName(&$out) X-Ref |
| Parse property name (as an array of parts or a string) param: array $out return: boolean |
| customProperty(&$out) X-Ref |
| Parse custom property name (as an array of parts or a string) param: array $out return: boolean |
| selectors(&$out, $subSelector = false) X-Ref |
| Parse comma separated selector list param: array $out param: string|boolean $subSelector return: boolean |
| selector(&$out, $subSelector = false) X-Ref |
| Parse whitespace separated selector list param: array $out param: string|boolean $subSelector return: boolean |
| matchEscapeCharacterInSelector(&$out, $keepEscapedNumber = false) X-Ref |
| parsing escaped chars in selectors: - escaped single chars are kept escaped in the selector but in a normalized form (if not in 0-9a-f range as this would be ambigous) - other escaped sequences (multibyte chars or 0-9a-f) are kept in their initial escaped form, normalized to lowercase TODO: this is a fallback solution. Ideally escaped chars in selectors should be encoded as the genuine chars, and escaping added when printing in the Compiler, where/if it's mandatory - but this require a better formal selector representation instead of the array we have now param: string $out param: bool $keepEscapedNumber return: bool |
| selectorSingle(&$out, $subSelector = false) X-Ref |
| Parse the parts that make up a selector {@internal div[yes=no]#something.hello.world:nth-child(-2n+1)%placeholder }} param: array $out param: string|boolean $subSelector return: boolean |
| variable(&$out) X-Ref |
| Parse a variable param: array $out return: boolean |
| keyword(&$word, $eatWhitespace = null, $inSelector = false) X-Ref |
| Parse a keyword param: string $word param: boolean $eatWhitespace param: boolean $inSelector return: boolean |
| restrictedKeyword(&$word, $eatWhitespace = null, $inSelector = false) X-Ref |
| Parse a keyword that should not start with a number param: string $word param: boolean $eatWhitespace param: boolean $inSelector return: boolean |
| placeholder(&$placeholder) X-Ref |
| Parse a placeholder param: string|array $placeholder return: boolean |
| url(&$out) X-Ref |
| Parse a url param: array $out return: boolean |
| end($eatWhitespace = null) X-Ref |
| Consume an end of statement delimiter param: bool $eatWhitespace return: boolean |
| stripAssignmentFlags(&$value) X-Ref |
| Strip assignment flag from the list param: array $value return: array |
| stripOptionalFlag(&$selectors) X-Ref |
| Strip optional flag from selector list param: array $selectors return: string |
| flattenList($value) X-Ref |
| Turn list of length 1 into value type param: array $value return: array |
| pregQuote($what) X-Ref |
| Quote regular expression param: string $what return: string |
| extractLineNumbers($buffer) X-Ref |
| Extract line numbers from buffer param: string $buffer |
| getSourcePosition($pos) X-Ref |
| Get source line number and column (given character position in the buffer) param: integer $pos return: array |
| saveEncoding() X-Ref |
| Save internal encoding |
| restoreEncoding() X-Ref |
| Restore internal encoding |
