File Source for Parser.php

<?php
/**
* PHP_ParserGenerator, a php 5 parser generator.
*
* This is a direct port of the Lemon parser generator, found at
* {@link http://www.hwaci.com/sw/lemon/}
*
* PHP version 5
*
* LICENSE: This source file is subject to version 3.01 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_01.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category php
* @package PHP_ParserGenerator
* @author Gregory Beaver <cellog@php.net>
* @copyright 2006 Gregory Beaver
* @license http://www.php.net/license/3_01.txt PHP License 3.01
* @version CVS: $Id$
* @since File available since Release 0.1.0
*/
/**
* The grammar parser for lemon grammar files.
*
* @package PHP_ParserGenerator
* @author Gregory Beaver <cellog@php.net>
* @copyright 2006 Gregory Beaver
* @license http://www.php.net/license/3_01.txt PHP License 3.01
* @since Class available since Release 0.1.0
*/
class PHP_ParserGenerator_Parser
{
const INITIALIZE = 1;
const WAITING_FOR_DECL_OR_RULE = 2;
const WAITING_FOR_DECL_KEYWORD = 3;
const WAITING_FOR_DECL_ARG = 4;
const WAITING_FOR_PRECEDENCE_SYMBOL = 5;
const WAITING_FOR_ARROW = 6;
const IN_RHS = 7;
const LHS_ALIAS_1 = 8;
const LHS_ALIAS_2 = 9;
const LHS_ALIAS_3 = 10;
const RHS_ALIAS_1 = 11;
const RHS_ALIAS_2 = 12;
const PRECEDENCE_MARK_1 = 13;
const PRECEDENCE_MARK_2 = 14;
const RESYNC_AFTER_RULE_ERROR = 15;
const RESYNC_AFTER_DECL_ERROR = 16;
const WAITING_FOR_DESTRUCTOR_SYMBOL = 17;
const WAITING_FOR_DATATYPE_SYMBOL = 18;
const WAITING_FOR_FALLBACK_ID = 19;
/**
* Name of the input file
*
* @var string
*/
public $filename;
/**
* Linenumber at which current token starts
* @var int
*/
public $tokenlineno;
/**
* Number of parsing errors so far
* @var int
*/
public $errorcnt;
/**
* Index of current token within the input string
* @var int
*/
public $tokenstart;
/**
* Global state vector
* @var PHP_ParserGenerator_Data
*/
public $gp;
/**
* Parser state (one of the class constants for this class)
*
* - PHP_ParserGenerator_Parser::INITIALIZE,
* - PHP_ParserGenerator_Parser::WAITING_FOR_DECL_OR_RULE,
* - PHP_ParserGenerator_Parser::WAITING_FOR_DECL_KEYWORD,
* - PHP_ParserGenerator_Parser::WAITING_FOR_DECL_ARG,
* - PHP_ParserGenerator_Parser::WAITING_FOR_PRECEDENCE_SYMBOL,
* - PHP_ParserGenerator_Parser::WAITING_FOR_ARROW,
* - PHP_ParserGenerator_Parser::IN_RHS,
* - PHP_ParserGenerator_Parser::LHS_ALIAS_1,
* - PHP_ParserGenerator_Parser::LHS_ALIAS_2,
* - PHP_ParserGenerator_Parser::LHS_ALIAS_3,
* - PHP_ParserGenerator_Parser::RHS_ALIAS_1,
* - PHP_ParserGenerator_Parser::RHS_ALIAS_2,
* - PHP_ParserGenerator_Parser::PRECEDENCE_MARK_1,
* - PHP_ParserGenerator_Parser::PRECEDENCE_MARK_2,
* - PHP_ParserGenerator_Parser::RESYNC_AFTER_RULE_ERROR,
* - PHP_ParserGenerator_Parser::RESYNC_AFTER_DECL_ERROR,
* - PHP_ParserGenerator_Parser::WAITING_FOR_DESTRUCTOR_SYMBOL,
* - PHP_ParserGenerator_Parser::WAITING_FOR_DATATYPE_SYMBOL,
* - PHP_ParserGenerator_Parser::WAITING_FOR_FALLBACK_ID
* @var int
*/
public $state;
/**
* The fallback token
* @var PHP_ParserGenerator_Symbol
*/
public $fallback;
/**
* Left-hand side of the current rule
* @var PHP_ParserGenerator_Symbol
*/
public $lhs;
/**
* Alias for the LHS
* @var string
*/
public $lhsalias;
/**
* Number of right-hand side symbols seen
* @var int
*/
public $nrhs;
/**
* Right-hand side symbols
* @var array array of {@link PHP_ParserGenerator_Symbol} objects
*/
public $rhs = array();
/**
* Aliases for each RHS symbol name (or NULL)
* @var array array of strings
*/
public $alias = array();
/**
* Previous rule parsed
* @var PHP_ParserGenerator_Rule
*/
public $prevrule;
/**
* Keyword of a declaration
*
* This is one of the %keyword keywords in the grammar file
* @var string
*/
public $declkeyword;
/**
* Where the declaration argument should be put
*
* This is assigned as a reference to an internal variable
* @var mixed
*/
public $declargslot = array();
/**
* Where the declaration linenumber is put
*
* This is assigned as a reference to an internal variable
* @var mixed
*/
public $decllnslot;
/*enum e_assoc*/
public $declassoc; /* Assign this association to decl arguments */
public $preccounter; /* Assign this precedence to decl arguments */
/**
* @var PHP_ParserGenerator_Rule
*/
public $firstrule; /* Pointer to first rule in the grammar */
/**
* @var PHP_ParserGenerator_Rule
*/
public $lastrule; /* Pointer to the most recently parsed rule */
/**
* @var PHP_ParserGenerator
*/
private $lemon;
function __construct(PHP_ParserGenerator $lem)
{
$this->lemon = $lem;
}
/**
* Run the preprocessor over the input file text. The Lemon variable
* $azDefine contains the names of all defined
* macros. This routine looks for "%ifdef" and "%ifndef" and "%endif" and
* comments them out. Text in between is also commented out as appropriate.
* @param string
*/
private function preprocess_input(&$z)
{
$lineno = $exclude = 0;
for ($i=0; $i < strlen($z); $i++) {
if ($z[$i] == "\n") {
$lineno++;
}
if ($z[$i] != '%' || ($i > 0 && $z[$i-1] != "\n")) {
continue;
}
if (substr($z, $i, 6) === "%endif" && trim($z[$i+6]) === '') {
if ($exclude) {
$exclude--;
if ($exclude === 0) {
for ($j = $start; $j < $i; $j++) {
if ($z[$j] != "\n") $z[$j] = ' ';
}
}
}
for ($j = $i; $j < strlen($z) && $z[$j] != "\n"; $j++) {
$z[$j] = ' ';
}
} elseif (substr($z, $i, 6) === "%ifdef" && trim($z[$i+6]) === '' ||
substr($z, $i, 7) === "%ifndef" && trim($z[$i+7]) === '') {
if ($exclude) {
$exclude++;
} else {
$j = $i;
$n = strtok(substr($z, $j), " \t");
$exclude = 1;
if (isset($this->lemon->azDefine[$n])) {
$exclude = 0;
}
if ($z[$i + 3]=='n') {
// this is a rather obtuse way of checking whether this is %ifndef
$exclude = !$exclude;
}
if ($exclude) {
$start = $i;
$start_lineno = $lineno;
}
}
//for ($j = $i; $j < strlen($z) && $z[$j] != "\n"; $j++) $z[$j] = ' ';
$j = strpos(substr($z, $i), "\n");
if ($j === false) {
$z = substr($z, 0, $i); // remove instead of adding ' '
} else {
$z = substr($z, 0, $i) . substr($z, $i + $j); // remove instead of adding ' '
}
}
}
if ($exclude) {
throw new Exception("unterminated %ifdef starting on line $start_lineno\n");
}
}
/**
* In spite of its name, this function is really a scanner.
*
* It reads in the entire input file (all at once) then tokenizes it.
* Each token is passed to the function "parseonetoken" which builds all
* the appropriate data structures in the global state vector "gp".
* @param PHP_ParserGenerator_Data
*/
function Parse(PHP_ParserGenerator_Data $gp)
{
$startline = 0;
$this->gp = $gp;
$this->filename = $gp->filename;
$this->errorcnt = 0;
$this->state = self::INITIALIZE;
/* Begin by reading the input file */
$filebuf = file_get_contents($this->filename);
if (!$filebuf) {
PHP_ParserGenerator::ErrorMsg($this->filename, 0, "Can't open this file for reading.");
$gp->errorcnt++;
return;
}
if (filesize($this->filename) != strlen($filebuf)) {
ErrorMsg($this->filename, 0, "Can't read in all %d bytes of this file.",
filesize($this->filename));
$gp->errorcnt++;
return;
}
/* Make an initial pass through the file to handle %ifdef and %ifndef */
$this->preprocess_input($filebuf);
/* Now scan the text of the input file */
$lineno = 1;
for ($cp = 0, $c = $filebuf[0]; $cp < strlen($filebuf); $cp++) {
$c = $filebuf[$cp];
if ($c == "\n") $lineno++; /* Keep track of the line number */
if (trim($c) === '') {
continue;
} /* Skip all white space */
if ($filebuf[$cp] == '/' && ($cp + 1 < strlen($filebuf)) && $filebuf[$cp + 1] == '/') {
/* Skip C++ style comments */
$cp += 2;
$z = strpos(substr($filebuf, $cp), "\n");
if ($z === false) {
$cp = strlen($filebuf);
break;
}
$lineno++;
$cp += $z;
continue;
}
if ($filebuf[$cp] == '/' && ($cp + 1 < strlen($filebuf)) && $filebuf[$cp + 1] == '*') {
/* Skip C style comments */
$cp += 2;
$z = strpos(substr($filebuf, $cp), '*/');
if ($z !== false) {
$lineno += count(explode("\n", substr($filebuf, $cp, $z))) - 1;
}
$cp += $z + 1;
continue;
}
$this->tokenstart = $cp; /* Mark the beginning of the token */
$this->tokenlineno = $lineno; /* Linenumber on which token begins */
if ($filebuf[$cp] == '"') { /* String literals */
$cp++;
$oldcp = $cp;
$test = strpos(substr($filebuf, $cp), '"');
if ($test === false) {
PHP_ParserGenerator::ErrorMsg($this->filename, $startline,
"String starting on this line is not terminated before the end of the file.");
$this->errorcnt++;
$nextcp = $cp = strlen($filebuf);
} else {
$cp += $test;
$nextcp = $cp + 1;
}
$lineno += count(explode("\n", substr($filebuf, $oldcp, $cp - $oldcp))) - 1;
} elseif ($filebuf[$cp] == '{') { /* A block of C code */
$cp++;
for ($level = 1; $cp < strlen($filebuf) && ($level > 1 || $filebuf[$cp] != '}'); $cp++) {
if ($filebuf[$cp] == "\n") {
$lineno++;
} elseif ($filebuf[$cp] == '{') {
$level++;
} elseif ($filebuf[$cp] == '}') {
$level--;
} elseif ($filebuf[$cp] == '/' && $filebuf[$cp + 1] == '*') {
/* Skip comments */
$cp += 2;
$z = strpos(substr($filebuf, $cp), '*/');
if ($z !== false) {
$lineno += count(explode("\n", substr($filebuf, $cp, $z))) - 1;
}
$cp += $z + 2;
} elseif ($filebuf[$cp] == '/' && $filebuf[$cp + 1] == '/') {
/* Skip C++ style comments too */
$cp += 2;
$z = strpos(substr($filebuf, $cp), "\n");
if ($z === false) {
$cp = strlen($filebuf);
break;
} else {
$lineno++;
}
$cp += $z;
} elseif ($filebuf[$cp] == "'" || $filebuf[$cp] == '"') {
/* String a character literals */
$startchar = $filebuf[$cp];
$prevc = 0;
for ($cp++; $cp < strlen($filebuf) && ($filebuf[$cp] != $startchar || $prevc === '\\'); $cp++) {
if ($filebuf[$cp] == "\n") {
$lineno++;
}
if ($prevc === '\\') {
$prevc = 0;
} else {
$prevc = $filebuf[$cp];
}
}
}
}
if ($cp >= strlen($filebuf)) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"PHP code starting on this line is not terminated before the end of the file.");
$this->errorcnt++;
$nextcp = $cp;
} else {
$nextcp = $cp + 1;
}
} elseif (preg_match('/[a-zA-Z0-9]/', $filebuf[$cp])) {
/* Identifiers */
preg_match('/[a-zA-Z0-9_]+/', substr($filebuf, $cp), $preg_results);
$cp += strlen($preg_results[0]);
$nextcp = $cp;
} elseif ($filebuf[$cp] == ':' && $filebuf[$cp + 1] == ':' &&
$filebuf[$cp + 2] == '=') {
/* The operator "::=" */
$cp += 3;
$nextcp = $cp;
} elseif (($filebuf[$cp] == '/' || $filebuf[$cp] == '|') &&
preg_match('/[a-zA-Z]/', $filebuf[$cp + 1])) {
$cp += 2;
preg_match('/[a-zA-Z0-9_]+/', substr($filebuf, $cp), $preg_results);
$cp += strlen($preg_results[0]);
$nextcp = $cp;
} else {
/* All other (one character) operators */
$cp ++;
$nextcp = $cp;
}
$this->parseonetoken(substr($filebuf, $this->tokenstart,
$cp - $this->tokenstart)); /* Parse the token */
$cp = $nextcp - 1;
}
$gp->rule = $this->firstrule;
$gp->errorcnt = $this->errorcnt;
}
/**
* Parse a single token
* @param string token
*/
function parseonetoken($token)
{
$x = $token;
$this->a = 0; // for referencing in WAITING_FOR_DECL_KEYWORD
if (PHP_ParserGenerator::DEBUG) {
printf("%s:%d: Token=[%s] state=%d\n",
$this->filename, $this->tokenlineno, $token, $this->state);
}
switch ($this->state) {
case self::INITIALIZE:
$this->prevrule = 0;
$this->preccounter = 0;
$this->firstrule = $this->lastrule = 0;
$this->gp->nrule = 0;
/* Fall thru to next case */
case self::WAITING_FOR_DECL_OR_RULE:
if ($x[0] == '%') {
$this->state = self::WAITING_FOR_DECL_KEYWORD;
} elseif (preg_match('/[a-z]/', $x[0])) {
$this->lhs = PHP_ParserGenerator_Symbol::Symbol_new($x);
$this->nrhs = 0;
$this->lhsalias = 0;
$this->state = self::WAITING_FOR_ARROW;
} elseif ($x[0] == '{') {
if ($this->prevrule === 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"There is no prior rule opon which to attach the code
fragment which begins on this line.");
$this->errorcnt++;
} elseif ($this->prevrule->code != 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Code fragment beginning on this line is not the first \
to follow the previous rule.");
$this->errorcnt++;
} else {
$this->prevrule->line = $this->tokenlineno;
$this->prevrule->code = substr($x, 1);
}
} elseif ($x[0] == '[') {
$this->state = self::PRECEDENCE_MARK_1;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Token \"%s\" should be either \"%%\" or a nonterminal name.",
$x);
$this->errorcnt++;
}
break;
case self::PRECEDENCE_MARK_1:
if (!preg_match('/[A-Z]/', $x[0])) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"The precedence symbol must be a terminal.");
$this->errorcnt++;
} elseif ($this->prevrule === 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"There is no prior rule to assign precedence \"[%s]\".", $x);
$this->errorcnt++;
} elseif ($this->prevrule->precsym != 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Precedence mark on this line is not the first to follow the previous rule.");
$this->errorcnt++;
} else {
$this->prevrule->precsym = PHP_ParserGenerator_Symbol::Symbol_new($x);
}
$this->state = self::PRECEDENCE_MARK_2;
break;
case self::PRECEDENCE_MARK_2:
if ($x[0] != ']') {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Missing \"]\" on precedence mark.");
$this->errorcnt++;
}
$this->state = self::WAITING_FOR_DECL_OR_RULE;
break;
case self::WAITING_FOR_ARROW:
if ($x[0] == ':' && $x[1] == ':' && $x[2] == '=') {
$this->state = self::IN_RHS;
} elseif ($x[0] == '(') {
$this->state = self::LHS_ALIAS_1;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Expected to see a \":\" following the LHS symbol \"%s\".",
$this->lhs->name);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::LHS_ALIAS_1:
if (preg_match('/[A-Za-z]/', $x[0])) {
$this->lhsalias = $x;
$this->state = self::LHS_ALIAS_2;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"\"%s\" is not a valid alias for the LHS \"%s\"\n",
$x, $this->lhs->name);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::LHS_ALIAS_2:
if ($x[0] == ')') {
$this->state = self::LHS_ALIAS_3;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Missing \")\" following LHS alias name \"%s\".",$this->lhsalias);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::LHS_ALIAS_3:
if ($x == '::=') {
$this->state = self::IN_RHS;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Missing \"->\" following: \"%s(%s)\".",
$this->lhs->name, $this->lhsalias);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::IN_RHS:
if ($x[0] == '.') {
$rp = new PHP_ParserGenerator_Rule;
$rp->ruleline = $this->tokenlineno;
for ($i = 0; $i < $this->nrhs; $i++) {
$rp->rhs[$i] = $this->rhs[$i];
$rp->rhsalias[$i] = $this->alias[$i];
}
$rp->lhs = $this->lhs;
$rp->lhsalias = $this->lhsalias;
$rp->nrhs = $this->nrhs;
$rp->code = 0;
$rp->precsym = 0;
$rp->index = $this->gp->nrule++;
$rp->nextlhs = $rp->lhs->rule;
$rp->lhs->rule = $rp;
$rp->next = 0;
if ($this->firstrule === 0) {
$this->firstrule = $this->lastrule = $rp;
} else {
$this->lastrule->next = $rp;
$this->lastrule = $rp;
}
$this->prevrule = $rp;
$this->state = self::WAITING_FOR_DECL_OR_RULE;
} elseif (preg_match('/[a-zA-Z]/', $x[0])) {
if ($this->nrhs >= PHP_ParserGenerator::MAXRHS) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Too many symbols on RHS or rule beginning at \"%s\".",
$x);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
} else {
if (isset($this->rhs[$this->nrhs - 1])) {
$msp = $this->rhs[$this->nrhs - 1];
if ($msp->type == PHP_ParserGenerator_Symbol::MULTITERMINAL) {
$inf = array_reduce($msp->subsym,
array($this, '_printmulti'), '');
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
'WARNING: symbol ' . $x . ' will not' .
' be part of previous multiterminal %s',
substr($inf, 0, strlen($inf) - 1)
);
}
}
$this->rhs[$this->nrhs] = PHP_ParserGenerator_Symbol::Symbol_new($x);
$this->alias[$this->nrhs] = 0;
$this->nrhs++;
}
} elseif (($x[0] == '|' || $x[0] == '/') && $this->nrhs > 0) {
$msp = $this->rhs[$this->nrhs - 1];
if ($msp->type != PHP_ParserGenerator_Symbol::MULTITERMINAL) {
$origsp = $msp;
$msp = new PHP_ParserGenerator_Symbol;
$msp->type = PHP_ParserGenerator_Symbol::MULTITERMINAL;
$msp->nsubsym = 1;
$msp->subsym = array($origsp);
$msp->name = $origsp->name;
$this->rhs[$this->nrhs - 1] = $msp;
}
$msp->nsubsym++;
$msp->subsym[$msp->nsubsym - 1] = PHP_ParserGenerator_Symbol::Symbol_new(substr($x, 1));
if (preg_match('/[a-z]/', $x[1]) ||
preg_match('/[a-z]/', $msp->subsym[0]->name[0])) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Cannot form a compound containing a non-terminal");
$this->errorcnt++;
}
} elseif ($x[0] == '(' && $this->nrhs > 0) {
$this->state = self::RHS_ALIAS_1;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Illegal character on RHS of rule: \"%s\".", $x);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::RHS_ALIAS_1:
if (preg_match('/[A-Za-z]/', $x[0])) {
$this->alias[$this->nrhs - 1] = $x;
$this->state = self::RHS_ALIAS_2;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"\"%s\" is not a valid alias for the RHS symbol \"%s\"\n",
$x, $this->rhs[$this->nrhs - 1]->name);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::RHS_ALIAS_2:
if ($x[0] == ')') {
$this->state = self::IN_RHS;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Missing \")\" following LHS alias name \"%s\".", $this->lhsalias);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_RULE_ERROR;
}
break;
case self::WAITING_FOR_DECL_KEYWORD:
if(preg_match('/[A-Za-z]/', $x[0])) {
$this->declkeyword = $x;
$this->declargslot = &$this->a;
$this->decllnslot = &$this->a;
$this->state = self::WAITING_FOR_DECL_ARG;
if ('name' == $x) {
$this->declargslot = &$this->gp->name;
} elseif ('include' == $x) {
$this->declargslot = &$this->gp->include_code;
$this->decllnslot = &$this->gp->includeln;
} elseif ('include_class' == $x) {
$this->declargslot = &$this->gp->include_classcode;
$this->decllnslot = &$this->gp->include_classln;
} elseif ('declare_class' == $x) {
$this->declargslot = &$this->gp->declare_classcode;
$this->decllnslot = &$this->gp->declare_classln;
} elseif ('code' == $x) {
$this->declargslot = &$this->gp->extracode;
$this->decllnslot = &$this->gp->extracodeln;
} elseif ('token_destructor' == $x) {
$this->declargslot = &$this->gp->tokendest;
$this->decllnslot = &$this->gp->tokendestln;
} elseif ('default_destructor' == $x) {
$this->declargslot = &$this->gp->vardest;
$this->decllnslot = &$this->gp->vardestln;
} elseif ('token_prefix' == $x) {
$this->declargslot = &$this->gp->tokenprefix;
} elseif ('syntax_error' == $x) {
$this->declargslot = &$this->gp->error;
$this->decllnslot = &$this->gp->errorln;
} elseif ('parse_accept' == $x) {
$this->declargslot = &$this->gp->accept;
$this->decllnslot = &$this->gp->acceptln;
} elseif ('parse_failure' == $x) {
$this->declargslot = &$this->gp->failure;
$this->decllnslot = &$this->gp->failureln;
} elseif ('stack_overflow' == $x) {
$this->declargslot = &$this->gp->overflow;
$this->decllnslot = &$this->gp->overflowln;
} elseif ('token_type' == $x) {
$this->declargslot = &$this->gp->tokentype;
} elseif ('default_type' == $x) {
$this->declargslot = &$this->gp->vartype;
} elseif ('stack_size' == $x) {
$this->declargslot = &$this->gp->stacksize;
} elseif ('start_symbol' == $x) {
$this->declargslot = &$this->gp->start;
} elseif ('left' == $x) {
$this->preccounter++;
$this->declassoc = PHP_ParserGenerator_Symbol::LEFT;
$this->state = self::WAITING_FOR_PRECEDENCE_SYMBOL;
} elseif ('right' == $x) {
$this->preccounter++;
$this->declassoc = PHP_ParserGenerator_Symbol::RIGHT;
$this->state = self::WAITING_FOR_PRECEDENCE_SYMBOL;
} elseif ('nonassoc' == $x) {
$this->preccounter++;
$this->declassoc = PHP_ParserGenerator_Symbol::NONE;
$this->state = self::WAITING_FOR_PRECEDENCE_SYMBOL;
} elseif ('destructor' == $x) {
$this->state = self::WAITING_FOR_DESTRUCTOR_SYMBOL;
} elseif ('type' == $x) {
$this->state = self::WAITING_FOR_DATATYPE_SYMBOL;
} elseif ('fallback' == $x) {
$this->fallback = 0;
$this->state = self::WAITING_FOR_FALLBACK_ID;
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Unknown declaration keyword: \"%%%s\".", $x);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
}
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Illegal declaration keyword: \"%s\".", $x);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
}
break;
case self::WAITING_FOR_DESTRUCTOR_SYMBOL:
if (!preg_match('/[A-Za-z]/', $x[0])) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Symbol name missing after %destructor keyword");
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
} else {
$sp = PHP_ParserGenerator_Symbol::Symbol_new($x);
$this->declargslot = &$sp->destructor;
$this->decllnslot = &$sp->destructorln;
$this->state = self::WAITING_FOR_DECL_ARG;
}
break;
case self::WAITING_FOR_DATATYPE_SYMBOL:
if (!preg_match('/[A-Za-z]/', $x[0])) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Symbol name missing after %destructor keyword");
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
} else {
$sp = PHP_ParserGenerator_Symbol::Symbol_new($x);
$this->declargslot = &$sp->datatype;
$this->state = self::WAITING_FOR_DECL_ARG;
}
break;
case self::WAITING_FOR_PRECEDENCE_SYMBOL:
if ($x[0] == '.') {
$this->state = self::WAITING_FOR_DECL_OR_RULE;
} elseif (preg_match('/[A-Z]/', $x[0])) {
$sp = PHP_ParserGenerator_Symbol::Symbol_new($x);
if ($sp->prec >= 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Symbol \"%s\" has already been given a precedence.", $x);
$this->errorcnt++;
} else {
$sp->prec = $this->preccounter;
$sp->assoc = $this->declassoc;
}
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Can't assign a precedence to \"%s\".", $x);
$this->errorcnt++;
}
break;
case self::WAITING_FOR_DECL_ARG:
if (preg_match('/[A-Za-z0-9{"]/', $x[0])) {
if ($this->declargslot != 0) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"The argument \"%s\" to declaration \"%%%s\" is not the first.",
$x[0] == '"' ? substr($x, 1) : $x, $this->declkeyword);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
} else {
$this->declargslot = ($x[0] == '"' || $x[0] == '{') ? substr($x, 1) : $x;
$this->a = 1;
if (!$this->decllnslot) {
$this->decllnslot = $this->tokenlineno;
}
$this->state = self::WAITING_FOR_DECL_OR_RULE;
}
} else {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"Illegal argument to %%%s: %s",$this->declkeyword, $x);
$this->errorcnt++;
$this->state = self::RESYNC_AFTER_DECL_ERROR;
}
break;
case self::WAITING_FOR_FALLBACK_ID:
if ($x[0] == '.') {
$this->state = self::WAITING_FOR_DECL_OR_RULE;
} elseif (!preg_match('/[A-Z]/', $x[0])) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"%%fallback argument \"%s\" should be a token", $x);
$this->errorcnt++;
} else {
$sp = PHP_ParserGenerator_Symbol::Symbol_new($x);
if ($this->fallback === 0) {
$this->fallback = $sp;
} elseif (is_object($sp->fallback)) {
PHP_ParserGenerator::ErrorMsg($this->filename, $this->tokenlineno,
"More than one fallback assigned to token %s", $x);
$this->errorcnt++;
} else {
$sp->fallback = $this->fallback;
$this->gp->has_fallback = 1;
}
}
break;
case self::RESYNC_AFTER_RULE_ERROR:
/* if ($x[0] == '.') $this->state = self::WAITING_FOR_DECL_OR_RULE;
** break; */
case self::RESYNC_AFTER_DECL_ERROR:
if ($x[0] == '.') {
$this->state = self::WAITING_FOR_DECL_OR_RULE;
}
if ($x[0] == '%') {
$this->state = self::WAITING_FOR_DECL_KEYWORD;
}
break;
}
}
/**
* return a descriptive string for a multi-terminal token.
*
* @param string $a
* @param string $b
* @return string
*/
private function _printmulti($a, $b)
{
if (!$a) {
$a = '';
}
$a .= $b->name . '|';
return $a;
}
}

	PHP_ParserGenerator

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Source for file Parser.php