mrsuh / php-bison-skeleton
PHP skeleton for Bison
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Language:M4
Requires
- php: >=7.4
Requires (Dev)
- phpunit/phpunit: ^9.6
- symfony/process: ^5.4
This package is auto-updated.
Last update: 2024-11-23 09:35:03 UTC
README
A set of Bison skeleton files that can be used to generate a Bison parser written in PHP.
Requirements:
- PHP >= 7.4
- Bison >= 3.8
Installation
composer require --dev mrsuh/php-bison-skeleton
Usage
bison -S vendor/mrsuh/php-bison-skeleton/src/php-skel.m4 -o parser.php grammar.y
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Example
grammar.y
%define api.parser.class {Parser} %token T_NUMBER %left '-' '+' %% start: expression { printf("%d\n", $1); } ; expression: T_NUMBER { $$ = $1; } | expression '+' expression { $$ = $1 + $3; } | expression '-' expression { $$ = $1 - $3; } ; %% class Lexer implements LexerInterface { private array $words; private int $index = 0; private int $value = 0; public function __construct($resource) { $this->words = explode(' ', trim(fgets($resource))); } public function yyerror(string $message): void { printf("%s\n", $message); } public function getLVal() { return $this->value; } public function yylex(): int { if ($this->index >= count($this->words)) { return LexerInterface::YYEOF; } $word = $this->words[$this->index++]; if (is_numeric($word)) { $this->value = (int)$word; return LexerInterface::T_NUMBER; } return ord($word); } } $lexer = new Lexer(STDIN); $parser = new Parser($lexer); if (!$parser->parse()) { exit(1); }
bison -S vendor/mrsuh/php-bison-skeleton/src/php-skel.m4 -o parser.php grammar.y
php parser.php <<< "1 + 2" 3
See more examples in the folder
Tests
composer test