function main()
{
$lem = new PHP_ParserGenerator_Data();
$this->OptInit($_SERVER['argv']);
if ($this->version) {
echo "Lemon version 1.0/PHP_ParserGenerator port version 0.1.5\n";
exit(0);
}
if ($this->OptNArgs($_SERVER['argv']) != 1) {
echo "Exactly one filename argument is required.\n";
exit(1);
}
$lem->errorcnt = 0;
/* Initialize the machine */
$lem->argv0 = $_SERVER['argv'][0];
$lem->filename = $this->OptArg(0, $_SERVER['argv']);
$a = pathinfo($lem->filename);
if (isset($a['extension'])) {
$ext = '.' . $a['extension'];
$lem->filenosuffix = substr($lem->filename, 0, strlen($lem->filename) - strlen($ext));
} else {
$lem->filenosuffix = $lem->filename;
}
$lem->basisflag = $this->basisflag;
$lem->has_fallback = 0;
$lem->nconflict = 0;
$lem->name = $lem->include_code = $lem->include_classcode = $lem->arg = $lem->tokentype = $lem->start = 0;
$lem->vartype = 0;
$lem->stacksize = 0;
$lem->error = $lem->overflow = $lem->failure = $lem->accept = $lem->tokendest = $lem->tokenprefix = $lem->outname = $lem->extracode = 0;
$lem->vardest = 0;
$lem->tablesize = 0;
PHP_ParserGenerator_Symbol::Symbol_new("\$");
$lem->errsym = PHP_ParserGenerator_Symbol::Symbol_new("error");
/* Parse the input file */
$parser = new PHP_ParserGenerator_Parser($this);
$parser->Parse($lem);
if ($lem->errorcnt) {
exit($lem->errorcnt);
}
if ($lem->rule === 0) {
printf("Empty grammar.\n");
exit(1);
}
/* Count and index the symbols of the grammar */
$lem->nsymbol = PHP_ParserGenerator_Symbol::Symbol_count();
PHP_ParserGenerator_Symbol::Symbol_new("{default}");
$lem->symbols = PHP_ParserGenerator_Symbol::Symbol_arrayof();
for ($i = 0; $i <= $lem->nsymbol; $i++) {
$lem->symbols[$i]->index = $i;
}
usort($lem->symbols, array('PHP_ParserGenerator_Symbol', 'sortSymbols'));
for ($i = 0; $i <= $lem->nsymbol; $i++) {
$lem->symbols[$i]->index = $i;
}
// find the first lower-case symbol
for ($i = 1; ord($lem->symbols[$i]->name[0]) < ord('Z'); $i++) {
}
$lem->nterminal = $i;
/* Generate a reprint of the grammar, if requested on the command line */
if ($this->rpflag) {
$this->Reprint();
} else {
/* Initialize the size for all follow and first sets */
$this->SetSize($lem->nterminal);
/* Find the precedence for every production rule (that has one) */
$lem->FindRulePrecedences();
/* Compute the lambda-nonterminals and the first-sets for every
** nonterminal */
$lem->FindFirstSets();
/* Compute all LR(0) states. Also record follow-set propagation
** links so that the follow-set can be computed later */
$lem->nstate = 0;
$lem->FindStates();
$lem->sorted = PHP_ParserGenerator_State::State_arrayof();
/* Tie up loose ends on the propagation links */
$lem->FindLinks();
/* Compute the follow set of every reducible configuration */
$lem->FindFollowSets();
/* Compute the action tables */
$lem->FindActions();
/* Compress the action tables */
if ($this->compress === 0) {
$lem->CompressTables();
}
/* Reorder and renumber the states so that states with fewer choices
** occur at the end. */
$lem->ResortStates();
/* Generate a report of the parser generated. (the "y.output" file) */
if (!$this->quiet) {
$lem->ReportOutput();
}
/* Generate the source code for the parser */
$lem->ReportTable($this->mhflag);
/* Produce a header file for use by the scanner. (This step is
** omitted if the "-m" option is used because makeheaders will
** generate the file for us.) */
// if (!$this->mhflag) {
// $this->ReportHeader();
// }
}
if ($this->statistics) {
printf("Parser statistics: %d terminals, %d nonterminals, %d rules\n", $lem->nterminal, $lem->nsymbol - $lem->nterminal, $lem->nrule);
printf(" %d states, %d parser table entries, %d conflicts\n", $lem->nstate, $lem->tablesize, $lem->nconflict);
}
if ($lem->nconflict) {
printf("%d parsing conflicts.\n", $lem->nconflict);
}
exit($lem->errorcnt + $lem->nconflict);
return $lem->errorcnt + $lem->nconflict;
}
/**
* Reduce the size of the action tables, if possible, by making use
* of defaults.
*
* In this version, we take the most frequent REDUCE action and make
* it the default.
*/
function CompressTables()
{
for ($i = 0; $i < $this->nstate; $i++) {
$stp = $this->sorted[$i]->data;
$nbest = 0;
$rbest = 0;
for ($ap = $stp->ap; $ap; $ap = $ap->next) {
if ($ap->type != PHP_ParserGenerator_Action::REDUCE) {
continue;
}
$rp = $ap->x;
if ($rp === $rbest) {
continue;
}
$n = 1;
for ($ap2 = $ap->next; $ap2; $ap2 = $ap2->next) {
if ($ap2->type != PHP_ParserGenerator_Action::REDUCE) {
continue;
}
$rp2 = $ap2->x;
if ($rp2 === $rbest) {
continue;
}
if ($rp2 === $rp) {
$n++;
}
}
if ($n > $nbest) {
$nbest = $n;
$rbest = $rp;
}
}
/* Do not make a default if the number of rules to default
** is not at least 1 */
if ($nbest < 1) {
continue;
}
/* Combine matching REDUCE actions into a single default */
for ($ap = $stp->ap; $ap; $ap = $ap->next) {
if ($ap->type == PHP_ParserGenerator_Action::REDUCE && $ap->x === $rbest) {
break;
}
}
if ($ap === 0) {
throw new Exception('$ap is not an object');
}
$ap->sp = PHP_ParserGenerator_Symbol::Symbol_new("{default}");
for ($ap = $ap->next; $ap; $ap = $ap->next) {
if ($ap->type == PHP_ParserGenerator_Action::REDUCE && $ap->x === $rbest) {
$ap->type = PHP_ParserGenerator_Action::NOT_USED;
}
}
$stp->ap = PHP_ParserGenerator_Action::Action_sort($stp->ap);
}
}
/**
* 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;
$this->gp->nrule = 0;
/* Fall thru to next case */
/* Fall thru to next case */
case self::WAITING_FOR_DECL_OR_RULE:
if ($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\n 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 \\\n 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] == '.') $this->state = self::WAITING_FOR_DECL_OR_RULE;
** break; */
/* if ($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;
}
}
