The Parle\Parser class

(PECL parle >= 0.5.1)

Introduction

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

Class synopsis

Parle\Parser {

/* Constants */

const integer ACTION_ERROR = 0 ;

const integer ACTION_SHIFT = 1 ;

const integer ACTION_REDUCE = 2 ;

const integer ACTION_GOTO = 3 ;

const integer ACTION_ACCEPT = 4 ;

const integer ERROR_SYNTAX = 0 ;

const integer ERROR_NON_ASSOCIATIVE = 1 ;

const integer ERROR_UNKOWN_TOKEN = 2 ;

/* Properties */

public integer $action = 0 ;

public integer $reduceId = 0 ;

/* Methods */

public advance ( void ) : void

public build ( void ) : void

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

public dump ( void ) : void

public errorInfo ( void ) : 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 ( void ) : 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_UNKOWN_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.

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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