mirror of
https://github.com/pierre42100/comunic
synced 2024-09-29 03:22:49 +00:00
335 lines
11 KiB
PHP
Executable File
335 lines
11 KiB
PHP
Executable File
<?php
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/**
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* The SCSS scanner is quite complex, having to deal with nested rules
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* and so forth and some disambiguation is non-trivial, so we are employing
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* a two-pass approach here - we first tokenize the source as normal with a
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* scanner, then we parse the token stream with a parser to figure out
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* what various things really are.
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*/
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class LuminousSCSSScanner extends LuminousScanner {
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private $regexen = array();
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public $rule_tag_map = array(
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'PROPERTY' => 'TYPE',
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'COMMENT_SL' => 'COMMENT',
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'COMMENT_ML' => 'COMMENT',
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'ELEMENT_SELECTOR' => 'KEYWORD',
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'STRING_S' => 'STRING',
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'STRING_D' => 'STRING',
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'CLASS_SELECTOR' => 'VARIABLE',
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'ID_SELECTOR' => 'VARIABLE',
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'PSEUDO_SELECTOR' => 'OPERATOR',
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'ATTR_SELECTOR' => 'OPERATOR',
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'WHITESPACE' => null,
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'COLON' => 'OPERATOR',
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'SEMICOLON' => 'OPERATOR',
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'COMMA' => 'OPERATOR',
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'R_BRACE' => 'OPERATOR',
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'R_BRACKET' => 'OPERATOR',
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'R_SQ_BRACKET' => 'OPERATOR',
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'L_BRACE' => 'OPERATOR',
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'L_BRACKET' => 'OPERATOR',
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'L_SQ_BRACKET' => 'OPERATOR',
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'OTHER_OPERATOR' => 'OPERATOR',
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'GENERIC_IDENTIFIER' => null,
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'AT_IDENTIFIER' => 'KEYWORD',
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'IMPORTANT' => 'KEYWORD',
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);
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public function init() {
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$this->regexen = array(
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// For the first pass we just feed in a bunch of tokens.
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// Some of these are generic and will require disambiguation later
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'COMMENT_SL' => LuminousTokenPresets::$C_COMMENT_SL,
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'COMMENT_ML' => LuminousTokenPresets::$C_COMMENT_ML,
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'STRING_S' => LuminousTokenPresets::$SINGLE_STR,
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'STRING_D' => LuminousTokenPresets::$DOUBLE_STR,
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// TODO check var naming, is $1 a legal variable?
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'VARIABLE' => '%\$[\-a-z_0-9]+ | \#\{\$[\-a-z_0-9]+\} %x',
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'AT_IDENTIFIER' => '%@[a-zA-Z0-9]+%',
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// This is generic - it may be a selector fragment, a rule, or
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// even a hex colour.
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'GENERIC_IDENTIFIER' => '@
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\\#[a-fA-F0-9]{3}(?:[a-fA-F0-9]{3})?
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[0-9]+(\.[0-9]+)?(\w+|%|in|cm|mm|em|ex|pt|pc|px|s)?
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-?[a-zA-Z_\-0-9]+[a-zA-Z_\-0-9]*
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|&
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@x',
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'IMPORTANT' => '/!important/',
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'L_BRACE' => '/\{/',
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'R_BRACE' => '/\}/',
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'L_SQ_BRACKET' => '/\[/',
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'R_SQ_BRACKET' => '/\]/',
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'L_BRACKET' => '/\(/',
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'R_BRACKET' => '/\)/',
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'DOUBLE_COLON' => '/::/',
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'COLON' => '/:/',
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'SEMICOLON' => '/;/',
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'DOT' => '/\./',
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'HASH' => '/#/',
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'COMMA' => '/,/',
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'OTHER_OPERATOR' => '@[+\-*/%&>=!]@',
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'WHITESPACE' => '/\s+/'
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);
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}
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public function main() {
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while (!$this->eos()) {
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$m = null;
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foreach($this->regexen as $token=>$pattern) {
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if ( ($m = $this->scan($pattern)) !== null) {
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$this->record($m, $token);
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break;
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}
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}
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if ($m === null) {
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$this->record($this->get(), null);
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}
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}
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$parser = new LuminousSASSParser();
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$parser->tokens = $this->tokens;
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$parser->parse();
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$this->tokens = $parser->tokens;
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}
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}
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/**
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* The parsing class
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*/
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class LuminousSASSParser {
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public $tokens;
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public $index;
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public $stack;
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static $delete_token = 'delete';
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/**
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* Returns true if the next token is the given token name
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* optionally skipping whitespace
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*/
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function next_is($token_name, $ignore_whitespace = false) {
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$i = $this->index+1;
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$len = count($this->tokens);
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while($i<$len) {
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$tok = $this->tokens[$i][0];
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if ($ignore_whitespace && $tok === 'WHITESPACE') {
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$i++;
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}
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else {
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return $tok === $token_name;
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}
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}
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return false;
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}
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/**
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* Returns the index of the next match of the sequence of tokens
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* given, optionally ignoring ertain tokens
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*/
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function next_sequence($sequence, $ignore=array()) {
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$i = $this->index+1;
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$len = count($this->tokens);
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$seq_len = count($sequence);
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$seq = 0;
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$seq_start = 0;
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while ($i<$len) {
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$tok = $this->tokens[$i][0];
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if ($tok === $sequence[$seq]) {
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if ($seq === 0) $seq_start = $i;
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$seq++;
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$i++;
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if ($seq === $seq_len) {
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return $seq_start;
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}
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} else {
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if (in_array($tok, $ignore)) {}
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else {
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$seq = 0;
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}
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$i++;
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}
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}
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return $len;
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}
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/**
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* Returns the first token which occurs out of the set of given tokens
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*/
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function next_of($token_names) {
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$i = $this->index+1;
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$len = count($this->tokens);
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while ($i<$len) {
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$tok = $this->tokens[$i][0];
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if (in_array($tok, $token_names)) {
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return $tok;
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}
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$i++;
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}
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return null;
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}
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/**
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* Returns the index of the next token with the given token name
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*/
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function next_of_type($token_name) {
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$i = $this->index+1;
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$len = count($this->tokens);
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while($i<$len) {
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$tok = $this->tokens[$i][0];
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if ($tok === $token_name) {
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return $i;
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}
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$i++;
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}
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return $len;
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}
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private function _parse_identifier($token) {
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$val = $token[1];
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$c = isset($val[0])? $val[0] : '';
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if (ctype_digit($c) || $c === '#') {
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$token[0] = 'NUMERIC';
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}
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}
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/**
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* Parses a selector rule
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*/
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private function _parse_rule() {
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$new_token = $this->tokens[$this->index];
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$set = false;
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if ($this->index > 0) {
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$prev_token = &$this->tokens[$this->index-1];
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$prev_token_type = &$prev_token[0];
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$prev_token_text = &$prev_token[1];
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$concat = false;
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$map = array(
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'DOT' => 'CLASS_SELECTOR',
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'HASH' => 'ID_SELECTOR',
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'COLON' => 'PSEUDO_SELECTOR',
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'DOUBLE_COLON' => 'PSEUDO_SELECTOR'
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);
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if (isset($map[$prev_token_type])) {
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// mark the prev token for deletion and concat into one.
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$new_token[0] = $map[$prev_token_type];
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$prev_token_type = self::$delete_token;
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$new_token[1] = $prev_token_text . $new_token[1];
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$set = true;
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}
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}
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if (!$set) {
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// must be an element
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$new_token[0] = 'ELEMENT_SELECTOR';
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}
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$this->tokens[$this->index] = $new_token;
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}
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/**
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* Cleans up the token stream by deleting any tokens marked for
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* deletion, and makes sure the array is continuous afterwards.
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*/
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private function _cleanup() {
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foreach($this->tokens as $i=>$t) {
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if ($t[0] === self::$delete_token) {
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unset($this->tokens[$i]);
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}
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}
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$this->tokens = array_values($this->tokens);
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}
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/**
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* Main parsing function
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*/
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public function parse() {
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$new_tokens = array();
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$len = count($this->tokens);
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$this->stack = array();
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$prop_value = 'PROPERTY';
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$pushes = array(
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'L_BRACKET' => 'bracket',
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'L_BRACE' => 'brace',
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'AT_IDENTIFIER' => 'at',
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'L_SQ_BRACKET' => 'square'
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);
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$pops = array(
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'R_BRACKET' => 'bracket',
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'R_BRACE' => 'brace',
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'R_SQ_BRACKET' => 'square'
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);
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$this->index = 0;
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while($this->index < $len) {
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$token = &$this->tokens[$this->index];
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$stack_size = count($this->stack);
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$state = !$stack_size? null : $this->stack[$stack_size-1];
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$tok_name = &$token[0];
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$in_brace = in_array('brace', $this->stack);
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$in_bracket = in_array('bracket', $this->stack);
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$in_sq = in_array('square', $this->stack);
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$in_at = in_array('at', $this->stack);
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if ($tok_name === self::$delete_token) continue;
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if ($tok_name === 'L_BRACE') {
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if ($state === 'at') {
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array_pop($this->stack);
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}
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$this->stack[] = $pushes[$tok_name];
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$prop_value = 'PROPERTY';
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}
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elseif (isset($pushes[$tok_name])) {
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$this->stack[] = $pushes[$tok_name];
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} else if (isset($pops[$tok_name]) && $state === $pops[$tok_name]) {
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array_pop($this->stack);
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}
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elseif (!$in_bracket && $tok_name === 'COLON') {
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$prop_value = 'VALUE';
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}
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elseif ($tok_name === 'SEMICOLON') {
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$prop_value = 'PROPERTY';
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if ($state === 'at') array_pop($this->stack);
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}
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elseif ($tok_name === 'GENERIC_IDENTIFIER') {
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// this is where the fun starts.
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// we have to figure out exactly what this is
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// if we can look ahead and find a '{' before we find a
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// ';', then this is part of a selector.
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// Otherwise it's part of a property/value pair.
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// the exception is when we have something like:
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// font : { family : sans-serif; }
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// then we need to check for ':{'
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if ($in_sq) {
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$token[0] = 'ATTR_SELECTOR';
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}
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else if ($in_bracket) {
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$this->_parse_identifier($token);
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}
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elseif(!$in_at) {
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$semi = $this->next_of_type('SEMICOLON');
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$colon_brace = $this->next_sequence(array('COLON', 'L_BRACE'),
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array('WHITESPACE'));
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$brace = $this->next_of_type('L_BRACE');
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$rule_terminator = min($semi, $colon_brace);
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if ($brace < $rule_terminator) {
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$this->_parse_rule();
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$prop_value = 'PROPERTY';
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} else {
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$this->tokens[$this->index][0] = $prop_value;
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if ($prop_value === 'VALUE') {
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$this->_parse_identifier($token);
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}
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}
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}
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}
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$this->index++;
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}
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$this->_cleanup();
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}
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} |