File: Lempar.php

void doParse( int $yymajor, mixed $yytokenvalue, mixed 2)

The main parser program.

The first argument is the major token number. The second is the token value string as scanned from the input.

Parameters

int	$yymajor	the token number
mixed	$yytokenvalue	the token value
mixed	2	... any extra arguments that should be passed to handlers

void PrintTrace( )

Output debug information to output (php://output stream)

string tokenName( int $tokenType)

This function returns the symbolic name associated with a token value.

Parameters

int

$tokenType

void Trace( resource $TraceFILE, string $zTracePrompt)

Turn parser tracing on by giving a stream to which to write the trace and a prompt to preface each trace message. Tracing is turned off by making either argument NULL

Inputs:

• A stream resource to which trace output should be written. If NULL, then tracing is turned off.
• A prefix string written at the beginning of every line of trace output. If NULL, then tracing is turned off.

Outputs:

• None.

Parameters

resource	$TraceFILE
string	$zTracePrompt

void yy_accept( )

The following is executed when the parser accepts

%parse_accept code is inserted here

void yy_destructor( int $yymajor, mixed $yypminor)

The following function deletes the value associated with a symbol. The symbol can be either a terminal or nonterminal.

Parameters

int	$yymajor	the symbol code
mixed	$yypminor	the symbol's value

void yy_find_reduce_action( int $stateno, int $iLookAhead)

Find the appropriate action for a parser given the non-terminal look-ahead token $iLookAhead.

If the look-ahead token is self::YYNOCODE, then check to see if the action is independent of the look-ahead. If it is, return the action, otherwise return self::YY_NO_ACTION.

Parameters

int	$stateno	Current state number
int	$iLookAhead	The look-ahead token

void yy_find_shift_action( int $iLookAhead)

Find the appropriate action for a parser given the terminal look-ahead token iLookAhead.

If the look-ahead token is YYNOCODE, then check to see if the action is independent of the look-ahead. If it is, return the action, otherwise return YY_NO_ACTION.

Parameters

int

$iLookAhead

The look-ahead token

array yy_get_expected_tokens( int $token)

Based on the current state and parser stack, get a list of all

possible lookahead tokens

Parameters

int

$token

bool yy_is_expected_token( int $token)

Based on the parser state and current parser stack, determine whether the lookahead token is possible.

The parser will convert the token value to an error token if not. This catches some unusual edge cases where the parser would fail.

Parameters

int

$token

void yy_parse_failed( )

The following code executes when the parse fails

Code from %parse_fail is inserted here

int yy_pop_parser_stack( ParseyyParser 0)

Pop the parser's stack once.

If there is a destructor routine associated with the token which is popped from the stack, then call it.

Return the major token number for the symbol popped.

Parameters

ParseyyParser

0

void yy_reduce( int $yyruleno)

Perform a reduce action and the shift that must immediately follow the reduce.

For a rule such as:

 A ::= B blah C. { dosomething(); }

This function will first call the action, if any, ("dosomething();" in our example), and then it will pop three states from the stack, one for each entry on the right-hand side of the expression (B, blah, and C in our example rule), and then push the result of the action back on to the stack with the resulting state reduced to (as described in the .out file)

Parameters

int

$yyruleno

Number of the rule by which to reduce

void yy_shift( int $yyNewState, int $yyMajor, mixed $yypMinor)

Perform a shift action.

Parameters

int	$yyNewState	The new state to shift in
int	$yyMajor	The major token to shift in
mixed	$yypMinor	the minor token to shift in

void yy_syntax_error( int $yymajor, mixed $TOKEN)

The following code executes when a syntax error first occurs.

%syntax_error code is inserted here

Parameters

int	$yymajor	The major type of the error token
mixed	$TOKEN	The minor type of the error token

void __destruct( )

Deallocate and destroy a parser. Destructors are all called for all stack elements before shutting the parser down.