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llk_php.php
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llk_php.php
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<?php
class PhpEmitter extends Emitter {
const IF_VS_CASE = 4;
const IF_VS_SET = 4;
const USE_GOTO = false;
const NEED_FORWARDS = false;
const COMBINE_FINAL = false;
function __construct($fn, $indent, $prefix, $global_vars, $lineno) {
parent::__construct($fn, $indent, $prefix, $global_vars, $lineno);
$this->write("<?php\n");
}
function prologue($grammar) {
$this->grammar = $grammar;
foreach ($grammar->term as $term) {
$this->write("const $term->const_name = $term->val;\n");
}
$this->write("\n");
$this->write("\$sym_name = [\n");
foreach ($grammar->term as $term) {
if ($term->special) {
$this->write("\t\"<$term->name>\",\n");
} else {
$this->write("\t\"$term->name\",\n");
}
}
$this->write("];\n\n");
$this->write("\$buf = \"\";\n");
$this->write("\$len = 0;\n");
$this->write("\$pos = 0;\n");
$this->write("\$text = 0;\n");
if ($this->lineno) {
$this->write("\$line = 1;\n");
}
$this->write("\n");
$this->write("function escape_char(\$c) {\n");
$this->write("\tif (ord(\$c) == ord('\'')) {\n");
$this->write("\t\treturn \"\\'\";\n");
$this->write("\t} else if (ord(\$c) == ord('\\\\')) {\n");
$this->write("\t\treturn \"\\\\\";\n");
$this->write("\t} else if (ord(\$c) == ord(\"\\r\")) {\n");
$this->write("\t\treturn \"\\\\r\";\n");
$this->write("\t} else if (ord(\$c) == ord(\"\\n\")) {\n");
$this->write("\t\treturn \"\\\\n\";\n");
$this->write("\t} else if (ord(\$c) == ord(\"\\t\")) {\n");
$this->write("\t\treturn \"\\\\t\";\n");
$this->write("\t} else if (ord(\$c) == ord(\"\\v\")) {\n");
$this->write("\t\treturn \"\\\\v\";\n");
$this->write("\t} else if (ord(\$c) == ord(\"\\f\")) {\n");
$this->write("\t\treturn \"\\\\f\";\n");
$this->write("\t} else if (ord(\$c) < ord(' ') || ord(\$c) >= 127) {\n");
$this->write("\t\t\$c = ord(\$c);\n");
$this->write("\t\treturn \"\\\\\" . chr(ord('0') + ((\$c >> 6) % 8)) .\n");
$this->write("\t\t\tchr(ord('0') + ((\$c >> 3) % 8)) .\n");
$this->write("\t\t\tchr(ord('0') + (\$c % 8));\n");
$this->write("\t} else {\n");
$this->write("\t\treturn \$c;\n");
$this->write("\t}\n");
$this->write("}\n");
$this->write("\n");
$this->write("function escape_string(\$s) {\n");
$this->write("\t\$n = strlen(\$s);\n");
$this->write("\t\$r = \"\";\n");
$this->write("\tfor (\$i = 0; \$i < \$n; \$i++) {\n");
$this->write("\t\t\$r .= escape_char(\$s[\$i]);\n");
$this->write("\t}\n");
$this->write("\treturn \$r;\n");
$this->write("}\n");
$this->write("\n");
$this->write("function get_text(\$f = 0, \$l = 0) {\n");
$this->write("\tglobal \$buf, \$text, \$pos;\n");
$this->write("\t\$text_len = \$pos - \$text;\n");
$this->write("\treturn (\$text_len - \$f - \$l > 0) ? substr(\$buf, \$text + \$f, \$text_len - \$f - \$l) : null;\n");
$this->write("}\n");
$this->write("\n");
}
function gen_escape_char($c) {
if ($c === '"') {
return "\\\"";
} else if ($c === "\\") {
return "\\\\";
} else if ($c < ' ' || ord($c) >= 127) {
if ($c === "\r") {
return "\\r";
} else if ($c === "\n") {
return "\\n";
} else if ($c === "\t") {
return "\\t";
} else if ($c === "\v") {
return "\\v";
} else if ($c === "\f") {
return "\\f";
} else {
$c = ord($c);
return "\\" . chr(ord('0') + (($c >> 6) % 8)) .
chr(ord('0') + (($c >> 3) % 8)) .
chr(ord('0') + ($c % 8));
}
} else {
return $c;
}
}
function gen_charset_condition($s) {
if (count($s) == 256) { // ANY
return "\$pos < \$len";
} else if (count($s) == 1) {
if ($s[0] === "<EOF>") {
return "\$pos >= \$len";
} else {
$c1 = $this->gen_escape_char($s[0]);
return "\$ch === \"$c1\"";
}
} else {
sort($s);
$n = count($s);
$i = 0;
$m = 0;
$r = "";
$r2 = "";
$first = true;
while ($i < $n) {
$j = $i;
$c1 = $s[$i];
$k = ord($c1);
$i++;
while ($i < $n && ord($s[$i]) == $k + 1) {
$c2 = $s[$i];
$k++;
$i++;
}
if ($first) {
$first = false;
} else {
$r .= " || ";
}
if ($i - $j == 1) {
$c1 = $this->gen_escape_char($c1);
$r .= "\$ch === \"$c1\"";
$m += 1;
} else if ($i - $j == 2) {
$c1 = $this->gen_escape_char($c1);
$c2 = $this->gen_escape_char($c2);
$r .= "\$ch === \"$c1\" || \$ch === \"$c2\"";
$m += 2;
} else {
if (ord($c1) == 0) {
$c2 = $this->gen_escape_char($c2);
$r .= "\$pos < \$len && (\$ch <= \"$c2\"";
$r2 = ")";
$m += 2;
} else if (ord($c2) == 255) {
$c1 = $this->gen_escape_char($c1);
$r .= "\$ch >= \"$c1\"";
$m += 1;
} else {
$c1 = $this->gen_escape_char($c1);
$c2 = $this->gen_escape_char($c2);
$r .= "(\$ch >= \"$c1\" && \$ch <= \"$c2\")";
$m += 2;
}
}
}
return $r . $r2;
}
}
function gen_neg_charset_condition($s) {
if (count($s) == 256) { // ANY
return "\$pos >= \$len";
} else if (count($s) == 1) {
if ($s[0] === "<EOF>") {
return "\$pos < \$len";
} else {
$c1 = $this->gen_escape_char($s[0]);
return "\$ch !== \"$c1\"";
}
} else {
sort($s);
$n = count($s);
$i = 0;
$m = 0;
$r = "";
$first = true;
while ($i < $n) {
$j = $i;
$c1 = $s[$i];
$k = ord($c1);
$i++;
while ($i < $n && ord($s[$i]) == $k + 1) {
$c2 = $s[$i];
$k++;
$i++;
}
if ($first) {
$first = false;
} else {
$r .= " && ";
}
if ($i - $j == 1) {
$c1 = $this->gen_escape_char($c1);
$r .= "\$ch !== \"$c1\"";
$m += 1;
} else if ($i - $j == 2) {
$c1 = $this->gen_escape_char($c1);
$c2 = $this->gen_escape_char($c2);
$r .= "\$ch !== \"$c1\" && \$ch !== \"$c2\"";
$m += 2;
} else {
if (ord($c1) == 0) {
$c2 = $this->gen_escape_char($c2);
$r .= "\$ch > \"$c2\"";
$m += 1;
} else if (ord($c2) == 255) {
$c1 = $this->gen_escape_char($c1);
$r .= "\$ch < \"$c1\"";
$m += 1;
} else {
$c1 = $this->gen_escape_char($c1);
$c2 = $this->gen_escape_char($c2);
$r .= "(\$ch < \"$c1\" || \$ch > \"$c2\")";
$m += 2;
}
}
}
return $r;
}
}
function scanner_start($func, $need_ret, $need_backtracking, $ctx) {
$this->indent();
$this->write("function $func() {\n");
$this->inc_indent();
$this->indent();
$this->write("global \$buf, \$pos, \$len, \$text;\n");
if ($this->lineno) {
$this->indent();
$this->write("global \$line;\n");
}
$this->write("\n");
if (self::USE_GOTO) {
$this->write("_yy_state_start:\n");
}
$this->indent();
$this->write("\$text = \$pos;\n");
if ($need_backtracking) {
$this->indent();
$this->write("\$accept = null;\n");
}
if ($ctx) {
$this->indent();
$this->write("\$ctx = 0;\n");
}
}
function scanner_loop_start() {
if (!self::USE_GOTO) {
$this->indent();
$this->write("\$state = 0;\n");
$this->indent();
$this->write("while (1) {\n");
$this->inc_indent();
$this->indent();
$this->write("\$ch = \$buf[\$pos];\n");
$this->indent();
$this->write("switch (\$state) {\n");
$this->inc_indent();
} else {
$this->indent();
$this->write("\$ch = \$buf[\$pos];\n");
}
}
function scanner_state_start($state, $first, $used, $tunnel_to, $sym = null) {
if (!self::USE_GOTO) {
$this->indent();
$this->write("case $state:\n");
$this->inc_indent();
} else {
if ($used) {
$this->write("_yy_state_$state:\n");
}
if (!$first) {
$this->indent();
$this->write("\$pos++;\n");
$this->indent();
$this->write("\$ch = \$buf[\$pos];\n");
}
if ($tunnel_to) {
$this->write("_yy_tunnel_$state:\n");
}
}
if ($sym !== null) {
$this->indent();
$this->write("\$accept = " . $this->grammar->term[$sym]->const_name . ";\n");
$this->indent();
$this->write("\$accept_pos = \$pos;\n");
}
}
function scanner_state_switch_start() {
$this->indent();
$this->write("switch (\$ch) {\n");
$this->inc_indent();
}
function scanner_state_switch_end() {
$this->dec_indent();
$this->indent();
$this->write("}\n");
}
function scanner_state_tunnel_accept($state, $sym) {
$this->indent();
$this->write("\$ret = " . $this->grammar->term[$sym]->const_name . ";\n");
$this->indent();
if (!self::USE_GOTO) {
$this->write("\$state = $state;\n");
} else {
$this->write("goto _yy_state_$state;\n");
}
}
function scanner_state_condition($first, $set, $use_switch, $error_state) {
if ($use_switch) {
foreach ($set as $ch) {
$this->indent();
if ($ch === "<EOF>") {
$this->write("case \"\\000\":\n");
$this->indent(1);
if (self::USE_GOTO) {
$this->write("if (\$ch === \"\\000\" && \$pos < \$len) goto _yy_state_error;\n");
} else {
$this->write("if (\$ch === \"\\000\" && \$pos < \$len) {\$state = $error_state; break;};\n");
}
} else {
$ch = $this->gen_escape_char($ch);
$this->write("case \"$ch\":\n");
}
}
} else {
$if = $first ? "if" : "} else if";
$this->indent();
$this->write("$if (" . $this->gen_charset_condition($set) . ") {\n");
}
$this->inc_indent();
if ($this->lineno) {
if (count($set) == 1 && $set[0] === "\n") {
$this->indent();
$this->write("\$line++;\n");
} else if (in_array("\n", $set, true)) {
$this->indent();
$this->write("if (\$ch === \"\\n\") {\n");
$this->indent(1);
$this->write("\$line++;\n");
$this->indent();
$this->write("}\n");
}
}
}
function scanner_state_tunnel_condition($set, $state, $sym) {
$this->indent();
$this->write("if (" . $this->gen_neg_charset_condition($set) . ") ");
if ($sym !== null) {
$this->write("{\$ret = " . $this->grammar->term[$sym]->const_name . "; ");
if (self::USE_GOTO) {
$this->write("goto _yy_tunnel_$state;}\n");
} else {
$this->write("\$state = $state; break;}\n");
}
} else {
if (self::USE_GOTO) {
$this->write("goto _yy_tunnel_$state;\n");
} else {
$this->write("{\$state = $state; break;}\n");
}
}
}
function scanner_state_alt_end($use_switch) {
$this->dec_indent();
if (!self::USE_GOTO && $use_switch) {
$this->indent(1);
$this->write("break;\n");
}
}
function scanner_inline_state_start($tunnel, $sym = null, $ctx, $prev_ctx) {
if ($ctx) {
$this->indent();
$this->write("\$ctx++;\n");
} else if ($prev_ctx) {
$this->indent();
$this->write("\$ctx = 0;\n");
}
if (!self::USE_GOTO || !$tunnel) {
$this->indent();
$this->write("\$pos++;\n");
if (!$tunnel) {
$this->indent();
$this->write("\$ch = \$buf[\$pos];\n");
}
if ($sym !== null) {
$this->indent();
$this->write("\$accept = " . $this->grammar->term[$sym]->const_name . ";\n");
$this->indent();
$this->write("\$accept_pos = \$pos;\n");
}
}
}
function scanner_state_transition($state, $target, $ctx, $prev_ctx) {
if ($ctx) {
$this->indent();
$this->write("\$ctx++;\n");
} else if ($prev_ctx) {
$this->indent();
$this->write("\$ctx = 0;\n");
}
if (!self::USE_GOTO) {
$this->indent();
$this->write("\$pos++;\n");
if ($state != $target) {
$this->indent();
$this->write("\$state = $target;\n");
}
} else {
$this->indent();
$this->write("goto _yy_state_$target;\n");
}
}
function scanner_state_accept($sym, $ctx) {
if ($ctx) {
$this->indent();
$this->write("\$pos -= \$ctx;\n");
} else {
$this->indent();
$this->write("\$pos++;\n");
}
if (self::COMBINE_FINAL) {
$this->indent();
$this->write("\$ret = " . $this->grammar->term[$sym]->const_name . ";\n");
$this->indent();
$this->write("goto _yy_fin;\n");
} else {
$this->indent();
$this->write("return " . $this->grammar->term[$sym]->const_name . ";\n");
}
}
function scanner_state_else_accept($sym, $use_switch) {
$this->indent();
if ($use_switch) {
$this->write("default:\n");
} else {
$this->write("} else {\n");
}
if (self::COMBINE_FINAL) {
if ($sym !== null) {
$this->indent(1);
$this->write("\$ret = " . $this->grammar->term[$sym]->const_name . ";\n");
}
$this->indent(1);
$this->write("goto _yy_fin;\n");
} else {
if ($sym !== null) {
$this->indent(1);
$this->write("return " . $this->grammar->term[$sym]->const_name . ";\n");
} else {
$this->indent(1);
$this->write("return \$ret;\n");
}
}
if ($use_switch) {
$this->dec_indent();
}
$this->indent();
$this->write("}\n");
}
function scanner_state_else_error($error_state, $use_switch) {
$this->indent();
if ($use_switch) {
$this->write("default:\n");
} else {
$this->write("} else {\n");
}
$this->indent(1);
if (!self::USE_GOTO) {
$this->write("\$state = $error_state;\n");
} else {
$this->write("goto _yy_state_error;\n");
}
if ($use_switch) {
$this->dec_indent();
}
$this->indent();
$this->write("}\n");
}
function scanner_state_else_tunnel($tunnel_state, $use_switch, $sym) {
$this->indent();
if ($use_switch) {
$this->write("default:\n");
} else {
$this->write("} else {\n");
}
if ($sym !== null) {
$this->indent(1);
$this->write("\$ret = " . $this->grammar->term[$sym]->const_name . ";\n");
}
$this->indent(1);
if (!self::USE_GOTO) {
$this->write("\$state = $tunnel_state;\n");
} else {
$this->write("goto _yy_tunnel_$tunnel_state;\n");
}
if ($use_switch) {
$this->dec_indent();
}
$this->indent();
$this->write("}\n");
}
function scanner_state_end() {
if (!self::USE_GOTO) {
$this->indent();
$this->write("break;\n");
$this->dec_indent();
}
}
function scanner_error_state($error_state, $need_backtracking) {
if (!self::USE_GOTO) {
$this->indent();
$this->write("case $error_state:\n");
$this->inc_indent();
} else {
$this->write("_yy_state_error:\n");
}
if ($need_backtracking) {
$this->indent();
$this->write("if (\$accept !== null) {\n");
$this->indent(1);
$this->write("\$pos = \$accept_pos;\n");
$this->indent(1);
$this->write("return \$accept;\n");
$this->indent();
$this->write("}\n");
}
$this->indent();
$this->write("if (\$pos >= \$len) {\n");
$this->indent(1);
$this->write("error(\"Unexpected <EOF>\");\n");
$this->indent();
$this->write("} else if (\$pos == \$text) {\n");
$this->indent(1);
$this->write("error(\"Unexpected character '\" . escape_char(\$ch) . \"'\");\n");
$this->indent();
$this->write("} else {\n");
$this->indent(1);
$this->write("error(\"Unexpected sequence '\" . escape_string(substr(\$buf, \$text, 1 + \$pos - \$text)) . \"'\");\n");
$this->indent();
$this->write("}\n");
$this->indent();
$this->write("\$pos++;\n");
if (!self::USE_GOTO) {
$this->indent();
$this->write("\$text = \$pos;\n");
$this->indent();
$this->write("\$state = 0;\n");
$this->indent();
$this->write("break;\n");
$this->dec_indent();
} else {
$this->indent();
$this->write("goto _yy_state_start;\n");
}
}
function scanner_loop_end() {
if (!self::USE_GOTO) {
$this->dec_indent();
$this->indent();
$this->write("}\n");
$this->dec_indent();
$this->indent();
$this->write("}\n");
} else if (self::COMBINE_FINAL) {
$this->write("_yy_fin:\n");
$this->indent(0);
$this->write("return \$ret;\n");
}
}
function scanner_end($func) {
$this->dec_indent();
$this->indent();
$this->write("}\n");
$this->write("\n");
}
function save_pos() {
$this->indent();
$this->write("\$save_pos = \$pos;\n");
$this->indent();
$this->write("\$save_text = \$text;\n");
if ($this->lineno) {
$this->indent();
$this->write("\$save_line = \$line;\n");
}
}
function restore_pos() {
$this->indent();
$this->write("\$pos = \$save_pos;\n");
$this->indent();
$this->write("\$text = \$save_text;\n");
if ($this->lineno) {
$this->indent();
$this->write("\$line = \$save_line;\n");
}
}
function gen_condition($set, $neg = false) {
if (count($set) == 0) {
return $neg ? "0" : "1";
} else if (count($set) <= self::IF_VS_SET) {
foreach($set as $sym => $dummy) {
if ($neg) {
if (isset($s)) {
$s .= " && \$sym != " . $this->grammar->term[$sym]->const_name;
} else {
$s = "\$sym != " . $this->grammar->term[$sym]->const_name;
}
} else {
if (isset($s)) {
$s .= " || \$sym == " . $this->grammar->term[$sym]->const_name;
} else {
$s = "\$sym == " . $this->grammar->term[$sym]->const_name;
}
}
}
} else {
if ($neg) {
$s = "!in_array(\$sym, array(";
} else {
$s = "in_array(\$sym, array(";
}
$first = true;
foreach($set as $sym => $dummy) {
if ($first) {
$first = false;
} else {
$s .= ",";
}
$s .= $this->grammar->term[$sym]->const_name;
}
$s .= '))';
}
return $s;
}
function collect_states($state, $p, &$set) {
while ($p != null &&
($p instanceof Epsilon || $p instanceof Action || $p instanceof Predicate)) {
$p = $p->next;
}
while ($p != null) {
if ($p instanceof Alternative) {
$q = $p;
do {
$this->collect_states($state, $q->start, $set);
$q = $q->alt;
} while ($q != null);
} else if ($p instanceof Option) {
$this->collect_states($state, $p->start, $set);
} else if ($p instanceof Iteration) {
$this->collect_states($state, $p->start, $set);
} else if ($p->state != $state) {
$set[$p->state] = 1;
return;
}
$p = $p->up ? null : $p->next;
}
}
function gen_alt_condition($state, $p) {
$set = array();
$this->collect_states($state, $p, $set);
$first = true;
$s = "";
foreach ($set as $alt => $dummy) {
if ($first) {
$first = false;
} else {
$s .= " || ";
}
$s .= "\$alt$state == $alt";
}
return $s;
}
function gen_alt_neg_condition($state, $p) {
$set = array();
$this->collect_states($state, $p, $set);
$first = true;
$s = "";
foreach ($set as $alt => $dummy) {
if ($first) {
$first = false;
} else {
$s .= " && ";
}
$s .= "\$alt$state != $alt";
}
return $s;
}
function gen_dfa_condition($set, $neg = false) {
if (count($set) == 0) {
return "1";
} else if (count($set) <= self::IF_VS_SET) {
foreach($set as $sym) {
if ($neg) {
if (isset($s)) {
$s .= " && \$sym2 != " . $this->grammar->term[$sym]->const_name;
} else {
$s = "\$sym2 != " . $this->grammar->term[$sym]->const_name;
}
} else {
if (isset($s)) {
$s .= " || \$sym2 == " . $this->grammar->term[$sym]->const_name;
} else {
$s = "\$sym2 == " . $this->grammar->term[$sym]->const_name;
}
}
}
} else {
if ($neg) {
$s = "!in_array(\$sym2, array(";
} else {
$s = "in_array(\$sym2, array(";
}
$first = true;
foreach($set as $sym) {
if ($first) {
$first = false;
} else {
$s .= ",";
}
$s .= $this->grammar->term[$sym]->const_name;
}
$s .= '))';
}
return $s;
}
function la_func() {
$this->indent();
$this->write("global \$pos, \$text, \$line;\n");
$this->write("\n");
}
function la_var($state) {
}
function la_loop_start($start) {
$this->indent();
$this->write("\$alt$start = -2;\n");
$this->indent();
$this->write("\$sym2 = \$sym;\n");
if (!self::USE_GOTO) {
$this->indent();
$this->write("\$state = 0;\n");
$this->indent();
$this->write("while (1) {\n");
$this->inc_indent();
$this->indent();
$this->write("switch (\$state) {\n");
$this->inc_indent();
}
}
function la_state_start($start, $state) {
if (!self::USE_GOTO) {
$this->indent();
$this->write("case $state:\n");
$this->inc_indent();
} else {
$this->write("_yy_state_$start"."_$state:\n");
}
}
function la_state_condition($first, $set) {
$if = $first ? "if" : "} else if";
$this->indent();
$this->write("$if (". $this->gen_dfa_condition($set) . ") {\n");
$this->inc_indent();
}
function la_state_accept($start, $alt) {
if (!self::USE_GOTO) {
$this->indent();
$this->write("\$alt$start = $alt;\n");
$this->indent();
$this->write("break 2;\n");
} else {
$this->indent();
$this->write("\$alt$start = $alt;\n");
$this->indent();
$this->write("goto _yy_state_$start;\n");
}
$this->dec_indent();
}
function la_state_transition($start, $state, $target, $get_sym) {
if (!self::USE_GOTO) {
if ($state != $target) {
$this->indent();
$this->write("\$state = $target;\n");
}
} else {
$this->indent();
$this->write("\$sym2 = $get_sym();\n");
$this->indent();
$this->write("goto _yy_state_$start"."_$target;\n");
}
$this->dec_indent();
}
function la_state_else_error() {
$this->indent();
$this->write("} else {\n");
$this->indent(1);
$this->write("error(\"unexpected '{\$GLOBALS['sym_name'][\$sym2]}'\");\n");
$this->indent();
$this->write("}\n");
}
function la_state_end() {
if (!self::USE_GOTO) {
$this->indent();
$this->write("break;\n");
$this->dec_indent();
}
}
function la_loop_end($start, $get_sym) {
if (!self::USE_GOTO) {
$this->dec_indent();
$this->indent();
$this->write("}\n");
$this->indent();
$this->write("\$sym2 = $get_sym();\n");
$this->dec_indent();
$this->indent();
$this->write("}\n");
} else {
$this->write("_yy_state_$start:\n");
}
}
function write_code($code) {
$this->indent();
// TODO: format code
$this->write(trim($code) . "\n");
}
function parser_func_start($name, $first, $attrs) {
$this->indent();
$this->write("function $name(" . ($first ? "" : "\$sym") . $this->gen_attrs($attrs, $first) . ") {\n");
$this->inc_indent();
}
function parser_func_end($name) {
$this->indent();
$this->write("return \$sym;\n");
$this->dec_indent();
$this->indent();
$this->write("}\n\n");
}
function parser_get_sym($get_sym) {
$this->indent();
$this->write("\$sym = $get_sym();\n");
}
function parser_expect($sym, $check_only = false) {
$this->indent();
$this->write("if (\$sym != " . $this->grammar->term[$sym]->const_name . ") {\n");
$this->indent(1);
if ($check_only) {
$this->write("return false;\n");
} else {
if ($this->grammar->term[$sym]->special) {
$this->write("error(\"<" . $this->grammar->term[$sym]->name . "> expected, got '{\$GLOBALS['sym_name'][\$sym]}'\");\n");
} else {
$this->write("error(\"'$sym' expected, got '{\$GLOBALS['sym_name'][\$sym]}'\");\n");
}
}
$this->indent();
$this->write("}\n");
}
function parser_nterm($name, $attrs, $skip, $check_only) {
if ($skip) {
$this->indent();
$this->write("\$sym = skip_$name(\$sym);\n");
} else if ($check_only) {
$this->indent();
$this->write("\$sym = check_$name(\$sym);\n");
$this->indent();
$this->write("if (\$sym === false) {\n");
$this->indent(1);
$this->write("return false;\n");
$this->indent();
$this->write("}\n");
} else {
$this->indent();
$this->write("\$sym = parse_$name(\$sym");
if ($attrs !== null) {
foreach($attrs as $attr) {
$this->write(", $attr");
}
}
$this->write(");\n");
}
}
function parser_condition($set, $pred = null) {
$this->write($this->gen_condition($set));
if ($pred !== null) {
if ($pred instanceof SyntaticPredicate) {
$this->write(" && " . ($pred->neg ? "!" : "") . $pred->name . "(\$sym)");
} else {
$this->write(" && (" . $pred->code . ")");
}
}
}
function parser_if_condition($set, $pred = null, $first = true) {
if ($first) {
$this->indent();
$this->write("if (");
} else {
$this->dec_indent();
$this->indent();
$this->write("} else if (");
}
$this->parser_condition($set, $pred);
$this->write(") {\n");
$this->inc_indent();
}
function parser_alt_if_condition($start, $state, $first = true) {
if ($first) {
$this->indent();
$this->write("if (");
} else {
$this->dec_indent();
$this->indent();
$this->write("} else if (");
}
$this->write($this->gen_alt_condition($start, $state).") {\n");
$this->inc_indent();
}
function parser_else() {
$this->dec_indent();
$this->indent();
$this->write("} else {\n");
$this->inc_indent();
}
function parser_end_if() {
$this->dec_indent();
$this->indent();
$this->write("}\n");
}
function parser_while_condition($set, $pred = null) {
$this->indent();
$this->write("while (");
$this->parser_condition($set, $pred);
$this->write(") {\n");
$this->inc_indent();
}