mirror of
https://github.com/pierre42100/comunic
synced 2024-09-29 03:22:49 +00:00
96 lines
2.9 KiB
PHP
Executable File
96 lines
2.9 KiB
PHP
Executable File
<?php
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/*
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* BNF has a lot of different variants and matching them all is pretty much
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* impossible.
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*
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* We're going to match the standard BNF and extended BNF and hopefully a
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* few very similar dialects
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*/
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class LuminousBNFScanner extends LuminousStatefulScanner {
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function user_def_ext($matches) {
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if ($matches[1] !== '')
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$this->record($matches[1], null);
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$this->record_token($matches[2], 'USER_FUNCTION');
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$this->user_defs[$matches[2]] = 'VALUE';
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$this->pos_shift(strlen($matches[1]) + strlen($matches[2]));
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}
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private function set_strict() {
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// no transition table necessary, I think
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$this->add_pattern('COMMENT', '/<![^>]*>/');
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$this->add_pattern('KEYWORD', '/(?<=^<)[^>]+(?=>)/m');
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$this->add_pattern('KEYWORD', '/(?<=^\\{)[^\\}]+(?=\\})/m');
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$this->add_pattern('VALUE', '/(?<=\\{)[^\\}]+(?=\\})/');
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$this->add_pattern('VALUE', '/[\\-\w]+/');
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}
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private function set_extended() {
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$this->add_pattern('COMMENT', '/\\(\\* .*? \\*\\)/sx');
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$this->add_pattern('OPTION', '/\\[/', '/\\]/');
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$this->add_pattern('REPETITION', '/\\{/', '/\\}/');
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$this->add_pattern('GROUP', '/\\(/', '/\\)/');
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$this->add_pattern('SPECIAL', '/\\?/', '/\\?/');
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$ident = '(?:[\w\\-]+)';
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$this->add_pattern('RULE', "/(^[ \t]*)($ident)(\s*(?![[:alnum:]\s]))/mi");
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$this->overrides['RULE'] = array($this, 'user_def_ext');
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$this->add_pattern('IDENT', "/$ident/");
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// technically I don't know if we really need to worry about a transition
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// table, but here we are anyway
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$all = array('COMMENT', 'OPTION', 'REPETITION', 'GROUP', 'SPECIAL',
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'STRING', 'IDENT', 'OPERATOR');
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$almost_all = array_filter($all, create_function('$x',
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'return $x !== "SPECIAL";'));
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$this->transitions = array(
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'initial' => array_merge(array('RULE'), $all),
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'OPTION' => $all,
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'REPETITION' => $all,
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'GROUP' => $all,
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'SPECIAL' => $almost_all
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);
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$this->rule_tag_map = array(
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'OPTION' => null,
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'REPETITION' => null,
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'GROUP' => null,
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'SPECIAL' => null
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);
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}
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function init() {
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// the original BNF uses <angle brackets> to delimit its
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// production rule names
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if (preg_match('/<\w+>/', $this->string())) {
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$this->set_strict();
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}
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else {
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$this->set_extended();
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}
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$this->add_pattern('STRING', LuminousTokenPresets::$SINGLE_STR_SL);
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$this->add_pattern('STRING', LuminousTokenPresets::$DOUBLE_STR_SL);
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$this->add_pattern('OPERATOR', '/[*\\-=+;:\\|,]+/');
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// assume a few chars at bol indicate a commented line
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$this->add_pattern('COMMENT', '/^[!%-;].*/m');
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$this->remove_filter('constant');
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$this->remove_filter('comment-to-doc');
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}
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static function guess_language($src, $info) {
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// being honest, BNF is going to be so rare that if we ever return
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// anything other than 0, it's more likely that we're obscuring the
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// correct scanner than correctly identifying BNF.
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return 0;
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}
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}
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