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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\Compiler\Grammar; |
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use Railt\Compiler\Grammar\Delegate\IncludeDelegate; |
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use Railt\Compiler\Grammar\Delegate\RuleDelegate; |
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use Railt\Compiler\Grammar\Delegate\TokenDelegate; |
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use Railt\Lexer\Factory; |
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use Railt\Lexer\LexerInterface; |
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use Railt\Parser\Driver\Llk; |
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use Railt\Parser\Driver\Stateful; |
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use Railt\Parser\Grammar; |
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use Railt\Parser\GrammarInterface; |
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use Railt\Parser\ParserInterface; |
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use Railt\Parser\Rule\Alternation; |
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use Railt\Parser\Rule\Concatenation; |
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use Railt\Parser\Rule\Repetition; |
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use Railt\Parser\Rule\Terminal; |
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/** |
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* Class Parser |
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*/ |
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class Parser extends Stateful |
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{ |
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/** |
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* @var string[] |
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*/ |
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private const LEXER_TOKENS = [ |
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'T_PRAGMA' => '%pragma\\h+([\\w\\.]+)\\h+([^\\s]+)', |
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'T_INCLUDE' => '%include\\h+([^\\s]+)', |
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'T_TOKEN' => '%token\\h+(\\w+)\\h+([^\\s]+)', |
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'T_SKIP' => '%skip\\h+(\\w+)\\h+([^\\s]+)', |
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'T_OR' => '\\|', |
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'T_TOKEN_SKIPPED' => '::(\\w+)::', |
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'T_TOKEN_KEPT' => '<(\\w+)>', |
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'T_TOKEN_STRING' => '("[^"\\\\]+(\\\\.[^"\\\\]*)*"|\'[^\'\\\\]+(\\\\.[^\'\\\\]*)*\')', |
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'T_INVOKE' => '(\\w+)\\(\\)', |
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'T_GROUP_OPEN' => '\\(', |
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'T_GROUP_CLOSE' => '\\)', |
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'T_REPEAT_ZERO_OR_ONE' => '\\?', |
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'T_REPEAT_ONE_OR_MORE' => '\\+', |
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'T_REPEAT_ZERO_OR_MORE' => '\\*', |
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'T_REPEAT_N_TO_M' => '{\\h*(\\d+)\\h*,\\h*(\\d+)\\h*}', |
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'T_REPEAT_N_OR_MORE' => '{\\h*(\\d+)\\h*,\\h*}', |
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'T_REPEAT_ZERO_TO_M' => '{\\h*,\\h*(\\d+)\\h*}', |
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'T_REPEAT_EXACTLY_N' => '{\\h*(\\d+)\\h*}', |
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'T_KEPT_NAME' => '#', |
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'T_NAME' => '[a-zA-Z_\\x7f-\\xff\\\\][a-zA-Z0-9_\\x7f-\\xff\\\\]*', |
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'T_EQ' => '(?:::)?=', |
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'T_COLON' => ':', |
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'T_END_OF_RULE' => ';', |
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'T_DELEGATE' => '\\->', |
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'T_WHITESPACE' => '(\\xfe\\xff|\\x20|\\x09|\\x0a|\\x0d)+', |
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'T_COMMENT' => '//[^\\n]*', |
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'T_BLOCK_COMMENT' => '/\\*.*?\\*/', |
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]; |
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/** |
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* @var string[] |
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*/ |
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private const LEXER_SKIPPED_TOKENS = [ |
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'T_WHITESPACE', |
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'T_COMMENT', |
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'T_BLOCK_COMMENT', |
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]; |
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/** |
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* @var string[] |
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*/ |
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private const PARSER_DELEGATES = [ |
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'IncludeDefinition' => IncludeDelegate::class, |
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'TokenDefinition' => TokenDelegate::class, |
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'RuleDefinition' => RuleDelegate::class, |
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]; |
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/** |
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* @return ParserInterface |
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* @throws \InvalidArgumentException |
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* @throws \Railt\Lexer\Exception\BadLexemeException |
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* @throws \Railt\Parser\Exception\GrammarException |
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*/ |
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protected function boot(): ParserInterface |
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{ |
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return new Llk($this->bootLexer(), $this->bootGrammar()); |
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} |
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/** |
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* @return LexerInterface |
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* @throws \InvalidArgumentException |
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* @throws \Railt\Lexer\Exception\BadLexemeException |
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*/ |
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public function bootLexer(): LexerInterface |
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{ |
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return Factory::create(self::LEXER_TOKENS, self::LEXER_SKIPPED_TOKENS, Factory::LOOKAHEAD); |
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} |
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/** |
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* @return GrammarInterface |
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* @throws \Railt\Parser\Exception\GrammarException |
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*/ |
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protected function bootGrammar(): GrammarInterface |
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{ |
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return new Grammar([ |
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new Repetition(0, 0, -1, '__definition', null), |
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new Concatenation('Grammar', [0,], 'Grammar'), |
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new Alternation('__definition', ['TokenDefinition', 'PragmaDefinition', 'IncludeDefinition', 'RuleDefinition',], null), |
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new Terminal(3, 'T_TOKEN', true), |
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new Concatenation(4, [3,], 'TokenDefinition'), |
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new Terminal(5, 'T_SKIP', true), |
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new Concatenation(6, [5,], 'TokenDefinition'), |
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new Alternation('TokenDefinition', [4, 6,], null), |
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new Terminal(8, 'T_PRAGMA', true), |
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new Concatenation('PragmaDefinition', [8,], 'PragmaDefinition'), |
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new Terminal(10, 'T_INCLUDE', true), |
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new Concatenation('IncludeDefinition', [10,], 'IncludeDefinition'), |
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new Repetition(12, 0, 1, 'ShouldKeep', null), |
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new Repetition(14, 0, 1, 'RuleDelegate', null), |
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new Concatenation('RuleDefinition', [12, 'RuleName', 'RuleProduction', 19], 'RuleDefinition'), |
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new Terminal(16, 'T_NAME', true), |
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new Concatenation('RuleName', [16, 14, '__ruleProductionDelimiter',], 'RuleName'), |
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new Terminal(18, 'T_END_OF_RULE', false), |
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new Repetition(19, 0, 1, 18), |
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new Terminal(21, 'T_DELEGATE', false), |
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new Terminal(22, 'T_NAME', true), |
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new Concatenation('RuleDelegate', [21, 22,], 'RuleDelegate'), |
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new Terminal(24, 'T_KEPT_NAME', false), |
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new Concatenation('ShouldKeep', [24,], 'ShouldKeep'), |
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new Terminal(26, 'T_COLON', false), |
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new Terminal(27, 'T_EQ', false), |
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new Alternation('__ruleProductionDelimiter', [26, 27,], null), |
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new Concatenation('RuleProduction', ['__alternation',], null), |
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new Alternation('__alternation', ['__concatenation', 'Alternation',], null), |
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new Terminal(31, 'T_OR', false), |
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new Concatenation(32, [31, '__concatenation',], 'Alternation'), |
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new Repetition(33, 1, -1, 32, null), |
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new Concatenation('Alternation', ['__concatenation', 33,], null), |
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new Alternation('__concatenation', ['__repetition', 'Concatenation',], null), |
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new Repetition(36, 1, -1, '__repetition', null), |
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new Concatenation('Concatenation', ['__repetition', 36,], 'Concatenation'), |
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new Alternation('__repetition', ['__simple', 'Repetition',], null), |
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new Concatenation('Repetition', ['__simple', 'Quantifier',], 'Repetition'), |
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new Terminal(40, 'T_GROUP_OPEN', false), |
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new Terminal(41, 'T_GROUP_CLOSE', false), |
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new Concatenation(42, [40, '__alternation', 41,], null), |
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new Terminal(43, 'T_TOKEN_SKIPPED', true), |
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new Terminal(44, 'T_TOKEN_KEPT', true), |
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new Terminal(45, 'T_INVOKE', true), |
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new Alternation('__simple', [42, 43, 44, 45,], null), |
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new Terminal(47, 'T_REPEAT_ZERO_OR_ONE', true), |
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new Concatenation(48, [47,], 'Quantifier'), |
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new Terminal(49, 'T_REPEAT_ONE_OR_MORE', true), |
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new Concatenation(50, [49,], 'Quantifier'), |
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new Terminal(51, 'T_REPEAT_ZERO_OR_MORE', true), |
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new Concatenation(52, [51,], 'Quantifier'), |
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new Terminal(53, 'T_REPEAT_N_TO_M', true), |
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new Concatenation(54, [53,], 'Quantifier'), |
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new Terminal(55, 'T_REPEAT_ZERO_OR_MORE', true), |
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new Concatenation(56, [55,], 'Quantifier'), |
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new Terminal(57, 'T_REPEAT_ZERO_TO_M', true), |
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new Concatenation(58, [57,], 'Quantifier'), |
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new Terminal(59, 'T_REPEAT_N_OR_MORE', true), |
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new Concatenation(60, [59,], 'Quantifier'), |
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new Terminal(61, 'T_REPEAT_EXACTLY_N', true), |
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new Concatenation(62, [61,], 'Quantifier'), |
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new Alternation('Quantifier', [48, 50, 52, 54, 56, 58, 60, 62,], null), |
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], 'Grammar', self::PARSER_DELEGATES); |
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} |
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} |
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railt /
compiler
