The Parle\Parser class

The Parle\Parser class

Introduction

(PECL parle >= 0.5.1)

Parser class. Rules can be defined on the fly. Once finalized, a Parle\Lexer instance is required to deliver the token stream.

Class synopsis

class Parle\Parser {

/* Constants */

const int ACTION_ERROR = 0;

const int ACTION_SHIFT = 1;

const int ACTION_REDUCE = 2;

const int ACTION_GOTO = 3;

const int ACTION_ACCEPT = 4;

const int ERROR_SYNTAX = 0;

const int ERROR_NON_ASSOCIATIVE = 1;

const int ERROR_UNKNOWN_TOKEN = 2;

/* Properties */

public int $action = 0;

public int $reduceId = 0;

/* Methods */

public advance(): void

public build(): void

public consume(string $data, Parle\Lexer $lexer): void

public dump(): void

public errorInfo(): Parle\ErrorInfo

public left(string $tok): void

public nonassoc(string $tok): void

public precedence(string $tok): void

public push(string $name, string $rule): int

public reset(int $tokenId = ?): void

public right(string $tok): void

public sigil(int $idx): string

public token(string $tok): void

public tokenId(string $tok): int

public trace(): string

public validate(string $data, Parle\Lexer $lexer): bool

}

Predefined Constants

Parle\Parser::ACTION_ERROR Parle\Parser::ACTION_SHIFT Parle\Parser::ACTION_REDUCE Parle\Parser::ACTION_GOTO Parle\Parser::ACTION_ACCEPT Parle\Parser::ERROR_SYNTAX Parle\Parser::ERROR_NON_ASSOCIATIVE Parle\Parser::ERROR_UNKNOWN_TOKEN

Properties

action

Current parser action that matches one of the action class constants, readonly.

reduceId

Grammar rule id just processed in the reduce action. The value corresponds either to a token or to a production id. Readonly.

Table of Contents

• Parle\Parser::advance — Process next parser rule
• Parle\Parser::build — Finalize the grammar rules
• Parle\Parser::consume — Consume the data for processing
• Parle\Parser::dump — Dump the grammar
• Parle\Parser::errorInfo — Retrieve the error information
• Parle\Parser::left — Declare a token with left-associativity
• Parle\Parser::nonassoc — Declare a token with no associativity
• Parle\Parser::precedence — Declare a precedence rule
• Parle\Parser::push — Add a grammar rule
• Parle\Parser::reset — Reset parser state
• Parle\Parser::right — Declare a token with right-associativity
• Parle\Parser::sigil — Retrieve a matching part of a rule
• Parle\Parser::token — Declare a token
• Parle\Parser::tokenId — Get token id
• Parle\Parser::trace — Trace the parser operation
• Parle\Parser::validate — Validate input

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https://www.php.net/manual/en/class.parle-parser.php