From: Matt Wilmas <mattwil@php.net>
Date: Tue, 5 May 2009 01:35:44 +0000 (+0000)
Subject: MFH: Implemented manual scanning for strings/comments, plus misc. fixes
X-Git-Tag: php-5.3.0RC2~11
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=09034cf3f495f980b035922717ab7dcbd6bcc62c;p=php

MFH: Implemented manual scanning for strings/comments, plus misc. fixes
---

diff --git a/NEWS b/NEWS
index b49bfa9a54..10c0e5b4c1 100644
--- a/NEWS
+++ b/NEWS
@@ -59,6 +59,8 @@ PHP                                                                        NEWS
 - Fixed bug #47038 (Memory leak in include). (Dmitry)
 - Fixed bug #47021 (SoapClient stumbles over WSDL delivered with
   "Transfer-Encoding: chunked"). (Dmitry)
+- Fixed bug #46817 (tokenizer misses last single-line comment (PHP 5.3+, with
+  re2c lexer)). (Matt, Shire)
 - Fixed bug #46108 (DateTime - Memory leak when unserializing). (Felipe)
 - Fixed bug #44861 (scrollable cursor don't work with pgsql). (Matteo)
 - Fixed bug #44409 (PDO::FETCH_SERIALIZE calls __construct()). (Matteo)
diff --git a/Zend/zend_highlight.c b/Zend/zend_highlight.c
index 8a885f7200..2c27cda3a9 100644
--- a/Zend/zend_highlight.c
+++ b/Zend/zend_highlight.c
@@ -142,14 +142,8 @@ ZEND_API void zend_highlight(zend_syntax_highlighter_ini *syntax_highlighter_ini
 				zend_printf("<span style=\"color: %s\">", last_color);
 			}
 		}
-		switch (token_type) {
-			case T_END_HEREDOC:
-				zend_html_puts(token.value.str.val, token.value.str.len TSRMLS_CC);
-				break;
-			default:
-				zend_html_puts(LANG_SCNG(yy_text), LANG_SCNG(yy_leng) TSRMLS_CC);
-				break;
-		}
+
+		zend_html_puts(LANG_SCNG(yy_text), LANG_SCNG(yy_leng) TSRMLS_CC);
 
 		if (token.type == IS_STRING) {
 			switch (token_type) {
@@ -170,19 +164,6 @@ ZEND_API void zend_highlight(zend_syntax_highlighter_ini *syntax_highlighter_ini
 		token.type = 0;
 	}
 
-	/* handler for trailing comments, see bug #42767 */
-	if (LANG_SCNG(yy_leng) && LANG_SCNG(yy_text) < LANG_SCNG(yy_limit)) {
-		if (last_color != syntax_highlighter_ini->highlight_comment) {
-			if (last_color != syntax_highlighter_ini->highlight_html) {
-				zend_printf("</span>");
-			}
-			if (syntax_highlighter_ini->highlight_comment != syntax_highlighter_ini->highlight_html) {
-				zend_printf("<span style=\"color: %s\">", syntax_highlighter_ini->highlight_comment);
-			}
-		}
-		zend_html_puts(LANG_SCNG(yy_text), (LANG_SCNG(yy_limit) - LANG_SCNG(yy_text)) TSRMLS_CC);
-	}
-
 	if (last_color != syntax_highlighter_ini->highlight_html) {
 		zend_printf("</span>\n");
 	}
diff --git a/Zend/zend_language_scanner.l b/Zend/zend_language_scanner.l
index 052c39084a..6717521ebd 100644
--- a/Zend/zend_language_scanner.l
+++ b/Zend/zend_language_scanner.l
@@ -109,6 +109,12 @@ do {																			\
 	} \
 }
 
+/* To save initial string length after scanning to first variable, CG(doc_comment_len) can be reused */
+#define SET_DOUBLE_QUOTES_SCANNED_LENGTH(len) CG(doc_comment_len) = (len)
+#define GET_DOUBLE_QUOTES_SCANNED_LENGTH()    CG(doc_comment_len)
+
+#define IS_LABEL_START(c) (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z') || (c) == '_' || (c) >= 0x7F)
+
 #define ZEND_IS_OCT(c)  ((c)>='0' && (c)<='7')
 #define ZEND_IS_HEX(c)  (((c)>='0' && (c)<='9') || ((c)>='a' && (c)<='f') || ((c)>='A' && (c)<='F'))
 
@@ -835,63 +841,8 @@ LABEL	[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*
 WHITESPACE [ \n\r\t]+
 TABS_AND_SPACES [ \t]*
 TOKENS [;:,.\[\]()|^&+-/*=%!~$<>?@]
-ANY_CHAR [^\x00]
+ANY_CHAR [^]
 NEWLINE ("\r"|"\n"|"\r\n")
-NULL [\x00]{1}
-
-/*
- * LITERAL_DOLLAR matches unescaped $ that aren't followed by a label character
- * or a { and therefore will be taken literally. The case of literal $ before
- * a variable or "${" is handled in a rule for each string type
- */
-DOUBLE_QUOTES_LITERAL_DOLLAR ("$"+([^a-zA-Z_\x7f-\xff$"\\{]|("\\"{ANY_CHAR})))
-BACKQUOTE_LITERAL_DOLLAR     ("$"+([^a-zA-Z_\x7f-\xff$`\\{]|("\\"{ANY_CHAR})))
-HEREDOC_LITERAL_DOLLAR       ("$"+([^a-zA-Z_\x7f-\xff$\n\r\\{]|("\\"[^\n\r])))
-
-/*
- * Usually, HEREDOC_NEWLINE will just function like a simple NEWLINE, but some
- * special cases need to be handled. HEREDOC_CHARS doesn't allow a line to
- * match when { or $, and/or \ is at the end. (("{"*|"$"*)"\\"?) handles that,
- * along with cases where { or $, and/or \ is the ONLY thing on a line
- *
- * The other case is when a line contains a label, followed by ONLY
- * { or $, and/or \  Handled by ({LABEL}";"?((("{"+|"$"+)"\\"?)|"\\"))
- */
-HEREDOC_NEWLINE ((({LABEL}";"?((("{"+|"$"+)"\\"?)|"\\"))|(("{"*|"$"*)"\\"?)){NEWLINE})
-
-/*
- * This pattern is just used in the next 2 for matching { or literal $, and/or
- * \ escape sequence immediately at the beginning of a line or after a label
- */
-HEREDOC_CURLY_OR_ESCAPE_OR_DOLLAR (("{"+[^$\n\r\\{])|("{"*"\\"[^\n\r])|{HEREDOC_LITERAL_DOLLAR})
-
-/*
- * These 2 label-related patterns allow HEREDOC_CHARS to continue "regular"
- * matching after a newline that starts with either a non-label character or a
- * label that isn't followed by a newline. Like HEREDOC_CHARS, they won't match
- * a variable or "{$"  Matching a newline, and possibly label, up TO a variable
- * or "{$", is handled in the heredoc rules
- *
- * The HEREDOC_LABEL_NO_NEWLINE pattern (";"[^$\n\r\\{]) handles cases where ;
- * follows a label. [^a-zA-Z0-9_\x7f-\xff;$\n\r\\{] is needed to prevent a label
- * character or ; from matching on a possible (real) ending label
- */
-HEREDOC_NON_LABEL ([^a-zA-Z_\x7f-\xff$\n\r\\{]|{HEREDOC_CURLY_OR_ESCAPE_OR_DOLLAR})
-HEREDOC_LABEL_NO_NEWLINE ({LABEL}([^a-zA-Z0-9_\x7f-\xff;$\n\r\\{]|(";"[^$\n\r\\{])|(";"?{HEREDOC_CURLY_OR_ESCAPE_OR_DOLLAR})))
-
-/*
- * CHARS matches everything up to a variable or "{$"
- * {'s are matched as long as they aren't followed by a $
- * The case of { before "{$" is handled in a rule for each string type
- *
- * For heredocs, matching continues across/after newlines if/when it's known
- * that the next line doesn't contain a possible ending label
- */
-DOUBLE_QUOTES_CHARS ("{"*([^$"\\{]|("\\"{ANY_CHAR}))|{DOUBLE_QUOTES_LITERAL_DOLLAR})
-BACKQUOTE_CHARS     ("{"*([^$`\\{]|("\\"{ANY_CHAR}))|{BACKQUOTE_LITERAL_DOLLAR})
-HEREDOC_CHARS       ("{"*([^$\n\r\\{]|("\\"[^\n\r]))|{HEREDOC_LITERAL_DOLLAR}|({HEREDOC_NEWLINE}+({HEREDOC_NON_LABEL}|{HEREDOC_LABEL_NO_NEWLINE})))
-
-NOWDOC_CHARS        ([^\n\r]|{NEWLINE}+([^a-zA-Z_\x7f-\xff\n\r]|({LABEL}([^a-zA-Z0-9_\x7f-\xff;\n\r]|(";"[^\n\r])))))
 
 /* compute yyleng before each rule */
 <!*> := yyleng = YYCURSOR - SCNG(yy_text);
@@ -1530,6 +1481,14 @@ NOWDOC_CHARS        ([^\n\r]|{NEWLINE}+([^a-zA-Z_\x7f-\xff\n\r]|({LABEL}([^a-zA-
 }
 
 <INITIAL>"<script"{WHITESPACE}+"language"{WHITESPACE}*"="{WHITESPACE}*("php"|"\"php\""|"'php'"){WHITESPACE}*">" {
+	YYCTYPE *bracket = zend_memrchr(yytext, '<', yyleng - (sizeof("script language=php>") - 1));
+
+	if (bracket != SCNG(yy_text)) {
+		/* Handle previously scanned HTML, as possible <script> tags found are assumed to not be PHP's */
+		YYCURSOR = bracket;
+		goto inline_html;
+	}
+
 	HANDLE_NEWLINES(yytext, yyleng);
 	zendlval->value.str.val = yytext; /* no copying - intentional */
 	zendlval->value.str.len = yyleng;
@@ -1601,29 +1560,48 @@ NOWDOC_CHARS        ([^\n\r]|{NEWLINE}+([^a-zA-Z_\x7f-\xff\n\r]|({LABEL}([^a-zA-
 }
 
 <INITIAL>{ANY_CHAR} {
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
+	}
 
 inline_char_handler:
 
 	while (1) {
 		YYCTYPE *ptr = memchr(YYCURSOR, '<', YYLIMIT - YYCURSOR);
 
-		if (ptr == NULL) {
-			YYCURSOR = YYLIMIT;
-			yyleng   = YYCURSOR - SCNG(yy_text);
-			break;
-
-		} else {
-			YYCURSOR = ptr + 1;
+		YYCURSOR = ptr ? ptr + 1 : YYLIMIT;
 
-			/* stop if it may be an opening tag (<?, <%, <script>). this condition is not optimal though */
-			if (YYCURSOR < YYLIMIT && (*YYCURSOR == '?' || *YYCURSOR == '%' || *YYCURSOR == 's')) {
-				--YYCURSOR;
-				yyleng = YYCURSOR - SCNG(yy_text);
-				break;
+		if (YYCURSOR < YYLIMIT) {
+			switch (*YYCURSOR) {
+				case '?':
+					if (CG(short_tags) || !strncasecmp(YYCURSOR + 1, "php", 3)) { /* Assume [ \t\n\r] follows "php" */
+						break;
+					}
+					continue;
+				case '%':
+					if (CG(asp_tags)) {
+						break;
+					}
+					continue;
+				case 's':
+				case 'S':
+					/* Probably NOT an opening PHP <script> tag, so don't end the HTML chunk yet
+					 * If it is, the PHP <script> tag rule checks for any HTML scanned before it */
+					YYCURSOR--;
+					yymore();
+				default:
+					continue;
 			}
+
+			YYCURSOR--;
 		}
+
+		break;
 	}
 
+inline_html:
+	yyleng = YYCURSOR - SCNG(yy_text);
+
 #ifdef ZEND_MULTIBYTE
 	if (SCNG(output_filter)) {
 		int readsize;
@@ -1688,7 +1666,6 @@ inline_char_handler:
 	/* Invalid rule to return a more explicit parse error with proper line number */
 	yyless(0);
 	yy_pop_state(TSRMLS_C);
-	ZVAL_EMPTY_STRING(zendlval); /* Empty since it won't be used */
 	return T_ENCAPSED_AND_WHITESPACE;
 }
 
@@ -1700,91 +1677,71 @@ inline_char_handler:
 
 
 <ST_IN_SCRIPTING>"#"|"//" {
-	BEGIN(ST_ONE_LINE_COMMENT);
-	yymore();
-}
-
-<ST_ONE_LINE_COMMENT>"?"|"%"|">" {
-	yymore();
-}
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '\r':
+				if (*YYCURSOR == '\n') {
+					YYCURSOR++;
+				}
+				/* fall through */
+			case '\n':
+				CG(zend_lineno)++;
+				break;
+			case '%':
+				if (!CG(asp_tags)) {
+					continue;
+				}
+				/* fall through */
+			case '?':
+				if (*YYCURSOR == '>') {
+					YYCURSOR--;
+					break;
+				}
+				/* fall through */
+			default:
+				continue;
+		}
 
-<ST_ONE_LINE_COMMENT>[^\n\r?%>]*{ANY_CHAR} {
-	switch (yytext[yyleng-1]) {
-		case '?': case '%': case '>':
-			yyless(yyleng-1);
-			yymore();
-			break;
-		case '\n':
-			CG(zend_lineno)++;
-			/* intentional fall through */
-		default:
-			zendlval->value.str.val = yytext; /* no copying - intentional */
-			zendlval->value.str.len = yyleng;
-			zendlval->type = IS_STRING;
-			BEGIN(ST_IN_SCRIPTING);
-			return T_COMMENT;
+		break;
 	}
-}
 
-<ST_ONE_LINE_COMMENT>{NEWLINE} {
-	zendlval->value.str.val = yytext; /* no copying - intentional */
-	zendlval->value.str.len = yyleng;
-	zendlval->type = IS_STRING;
-	BEGIN(ST_IN_SCRIPTING);
-	CG(zend_lineno)++;
+	yyleng = YYCURSOR - SCNG(yy_text);
+
 	return T_COMMENT;
 }
 
-<ST_ONE_LINE_COMMENT>"?>"|"%>" {
-	if (CG(asp_tags) || yytext[yyleng-2] != '%') { /* asp comment? */
-		zendlval->value.str.val = yytext; /* no copying - intentional */
-		zendlval->value.str.len = yyleng-2;
-		zendlval->type = IS_STRING;
-		yyless(yyleng - 2);
-		BEGIN(ST_IN_SCRIPTING);
-		return T_COMMENT;
+<ST_IN_SCRIPTING>"/*"|"/**"{WHITESPACE} {
+	int doc_com;
+
+	if (yyleng > 2) {
+		doc_com = 1;
+		RESET_DOC_COMMENT();
 	} else {
-		yymore();
+		doc_com = 0;
 	}
-}
-
-<ST_IN_SCRIPTING>"/**"{WHITESPACE} {
-	RESET_DOC_COMMENT();
-	BEGIN(ST_DOC_COMMENT);
-	yymore();
-}
-
-<ST_COMMENT,ST_DOC_COMMENT>{NULL} {
-	zend_error(E_COMPILE_WARNING, "Unterminated comment starting line %d", CG(zend_lineno));
-	return 0;
-}
-
-<ST_IN_SCRIPTING>"/*" {
-	BEGIN(ST_COMMENT);
-	yymore();
-}
 
+	while (YYCURSOR < YYLIMIT) {
+		if (*YYCURSOR++ == '*' && *YYCURSOR == '/') {
+			break;
+		}
+	}
 
-<ST_COMMENT,ST_DOC_COMMENT>[^*]+ {
-	yymore();
-}
+	if (YYCURSOR < YYLIMIT) {
+		YYCURSOR++;
+	} else {
+		zend_error(E_COMPILE_WARNING, "Unterminated comment starting line %d", CG(zend_lineno));
+	}
 
-<ST_DOC_COMMENT>"*/" {
-	CG(doc_comment) = estrndup(yytext, yyleng);
-	CG(doc_comment_len) = yyleng;
+	yyleng = YYCURSOR - SCNG(yy_text);
 	HANDLE_NEWLINES(yytext, yyleng);
-	BEGIN(ST_IN_SCRIPTING);
-	return T_DOC_COMMENT;
-}
 
-<ST_COMMENT>"*/" {
-	HANDLE_NEWLINES(yytext, yyleng);
-	BEGIN(ST_IN_SCRIPTING);
-	return T_COMMENT;
-}
+	if (doc_com) {
+		CG(doc_comment) = estrndup(yytext, yyleng);
+		CG(doc_comment_len) = yyleng;
+		return T_DOC_COMMENT;
+	}
 
-<ST_COMMENT,ST_DOC_COMMENT>"*" {
-	yymore();
+	return T_COMMENT;
 }
 
 <ST_IN_SCRIPTING>("?>"|"</script"{WHITESPACE}*">"){NEWLINE}? {
@@ -1810,21 +1767,31 @@ inline_char_handler:
 }
 
 
-/* ("{"*|"$"*) handles { or $ at the end of a string (or the entire contents)
- */
-<ST_IN_SCRIPTING>(b?["]{DOUBLE_QUOTES_CHARS}*("{"*|"$"*)["]) {
-	int bprefix = (yytext[0] != '"') ? 1 : 0;
-
-	zend_scan_escape_string(zendlval, yytext+bprefix+1, yyleng-bprefix-2, '"' TSRMLS_CC);
-	return T_CONSTANT_ENCAPSED_STRING;
-}
-
-
-<ST_IN_SCRIPTING>(b?[']([^'\\]|("\\"{ANY_CHAR}))*[']) {
+<ST_IN_SCRIPTING>b?['] {
 	register char *s, *t;
 	char *end;
 	int bprefix = (yytext[0] != '\'') ? 1 : 0;
 
+	while (1) {
+		if (YYCURSOR < YYLIMIT) {
+			if (*YYCURSOR == '\'') {
+				YYCURSOR++;
+				yyleng = YYCURSOR - SCNG(yy_text);
+
+				break;
+			} else if (*YYCURSOR++ == '\\' && YYCURSOR < YYLIMIT) {
+				YYCURSOR++;
+			}
+		} else {
+			yyleng = YYLIMIT - SCNG(yy_text);
+
+			/* Unclosed single quotes; treat similar to double quotes, but without a separate token
+			 * for ' (unrecognized by parser), instead of old flex fallback to "Unexpected character..."
+			 * rule, which continued in ST_IN_SCRIPTING state after the quote */
+			return T_ENCAPSED_AND_WHITESPACE;
+		}
+	}
+
 	zendlval->value.str.val = estrndup(yytext+bprefix+1, yyleng-bprefix-2);
 	zendlval->value.str.len = yyleng-bprefix-2;
 	zendlval->type = IS_STRING;
@@ -1872,6 +1839,42 @@ inline_char_handler:
 
 
 <ST_IN_SCRIPTING>b?["] {
+	int bprefix = (yytext[0] != '"') ? 1 : 0;
+
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '"':
+				yyleng = YYCURSOR - SCNG(yy_text);
+				zend_scan_escape_string(zendlval, yytext+bprefix+1, yyleng-bprefix-2, '"' TSRMLS_CC);
+				return T_CONSTANT_ENCAPSED_STRING;
+			case '$':
+				if (IS_LABEL_START(*YYCURSOR) || *YYCURSOR == '{') {
+					break;
+				}
+				continue;
+			case '{':
+				if (*YYCURSOR == '$') {
+					break;
+				}
+				continue;
+			case '\\':
+				if (YYCURSOR < YYLIMIT) {
+					YYCURSOR++;
+				}
+				/* fall through */
+			default:
+				continue;
+		}
+
+		YYCURSOR--;
+		break;
+	}
+
+	/* Remember how much was scanned to save rescanning */
+	SET_DOUBLE_QUOTES_SCANNED_LENGTH(YYCURSOR - SCNG(yy_text) - yyleng);
+
+	YYCURSOR = SCNG(yy_text) + yyleng;
+
 	BEGIN(ST_DOUBLE_QUOTES);
 	return '"';
 }
@@ -1911,7 +1914,7 @@ inline_char_handler:
 
 	/* Check for ending label on the next line */
 	if (CG(heredoc_len) < YYLIMIT - YYCURSOR && !memcmp(YYCURSOR, s, CG(heredoc_len))) {
-		unsigned char *end = YYCURSOR + CG(heredoc_len);
+		YYCTYPE *end = YYCURSOR + CG(heredoc_len);
 
 		if (*end == ';') {
 			end++;
@@ -1932,49 +1935,6 @@ inline_char_handler:
 }
 
 
-/* Match everything up to and including a possible ending label, so if the label
- * doesn't match, it's kept with the rest of the string
- *
- * {HEREDOC_NEWLINE}+ handles the case of more than one newline sequence that
- * couldn't be matched with HEREDOC_CHARS, because of the following label
- */
-<ST_HEREDOC>{HEREDOC_CHARS}*{HEREDOC_NEWLINE}+{LABEL}";"?[\n\r] {
-	char *end = yytext + yyleng - 1;
-
-	if (end[-1] == ';') {
-		end--;
-		yyleng--;
-	}
-
-	if (yyleng > CG(heredoc_len) && !memcmp(end - CG(heredoc_len), CG(heredoc), CG(heredoc_len))) {
-		int len = yyleng - CG(heredoc_len) - 2; /* 2 for newline before and after label */
-
-		/* May have matched fooLABEL; make sure there's a newline before it */
-		if (yytext[len] != '\n') {
-			if (yytext[len] != '\r') {
-				yyless(yyleng - 1);
-				yymore();
-			}
-		} else if (len > 0 && yytext[len - 1] == '\r') {
-			len--; /* Windows newline */
-		}
-
-		/* Go back before label, to match in ST_END_HEREDOC state. yytext will include
-		 * newline before label, for zend_highlight/strip, tokenizer, etc. */
-		yyless(yyleng - CG(heredoc_len) - 1); /* 1 for newline after label */
-
-		CG(increment_lineno) = 1; /* For newline before label */
-		BEGIN(ST_END_HEREDOC);
-		zend_scan_escape_string(zendlval, yytext, len, 0 TSRMLS_CC);
-		return T_ENCAPSED_AND_WHITESPACE;
-	} else {
-		/* Go back to end of label, so the next match works correctly in case of
-		 * a variable or another label at the beginning of the next line */
-		yyless(yyleng - 1);
-		yymore();
-	}
-}
-
 <ST_END_HEREDOC>{ANY_CHAR} {
 	YYCURSOR += CG(heredoc_len) - 1;
 	yyleng = CG(heredoc_len);
@@ -1988,118 +1948,250 @@ inline_char_handler:
 }
 
 
-/* Will only match when $ follows: "{$" */
-<ST_DOUBLE_QUOTES,ST_BACKQUOTE,ST_HEREDOC>"{" {
+<ST_DOUBLE_QUOTES,ST_BACKQUOTE,ST_HEREDOC>"{$" {
 	zendlval->value.lval = (long) '{';
 	yy_push_state(ST_IN_SCRIPTING TSRMLS_CC);
+	yyless(1);
 	return T_CURLY_OPEN;
 }
 
 
-<ST_DOUBLE_QUOTES>{DOUBLE_QUOTES_CHARS}+ {
-	zend_scan_escape_string(zendlval, yytext, yyleng, '"' TSRMLS_CC);
-	return T_ENCAPSED_AND_WHITESPACE;
+<ST_DOUBLE_QUOTES>["] {
+	BEGIN(ST_IN_SCRIPTING);
+	return '"';
 }
 
-/* "{"{2,}|"$"{2,} handles { before "{$" or literal $ before a variable or "${"
- * (("{"+|"$"+)["]) handles { or $ at the end of a string
- *
- * Same for backquotes and heredocs, except the second case doesn't apply to
- * heredocs. yyless(yyleng - 1) is used to correct taking one character too many
- */
-<ST_DOUBLE_QUOTES>{DOUBLE_QUOTES_CHARS}*("{"{2,}|"$"{2,}|(("{"+|"$"+)["])) {
-	yyless(yyleng - 1);
-	zend_scan_escape_string(zendlval, yytext, yyleng, '"' TSRMLS_CC);
-	return T_ENCAPSED_AND_WHITESPACE;
+<ST_BACKQUOTE>[`] {
+	BEGIN(ST_IN_SCRIPTING);
+	return '`';
 }
 
 
-<ST_BACKQUOTE>{BACKQUOTE_CHARS}+ {
-	zend_scan_escape_string(zendlval, yytext, yyleng, '`' TSRMLS_CC);
-	return T_ENCAPSED_AND_WHITESPACE;
-}
+<ST_DOUBLE_QUOTES>{ANY_CHAR} {
+	if (GET_DOUBLE_QUOTES_SCANNED_LENGTH()) {
+		YYCURSOR += GET_DOUBLE_QUOTES_SCANNED_LENGTH() - 1;
+		SET_DOUBLE_QUOTES_SCANNED_LENGTH(0);
 
-<ST_BACKQUOTE>{BACKQUOTE_CHARS}*("{"{2,}|"$"{2,}|(("{"+|"$"+)[`])) {
-	yyless(yyleng - 1);
-	zend_scan_escape_string(zendlval, yytext, yyleng, '`' TSRMLS_CC);
-	return T_ENCAPSED_AND_WHITESPACE;
-}
+		goto double_quotes_scan_done;
+	}
 
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
+	}
+	if (yytext[0] == '\\' && YYCURSOR < YYLIMIT) {
+		YYCURSOR++;
+	}
 
-/* ({HEREDOC_NEWLINE}+({LABEL}";"?)?)? handles the possible case of newline
- * sequences, possibly followed by a label, that couldn't be matched with
- * HEREDOC_CHARS because of a following variable or "{$"
- *
- * This doesn't affect real ending labels, as they are followed by a newline,
- * which will result in a longer match for the correct rule if present
- */
-<ST_HEREDOC>{HEREDOC_CHARS}*({HEREDOC_NEWLINE}+({LABEL}";"?)?)? {
-	zend_scan_escape_string(zendlval, yytext, yyleng, 0 TSRMLS_CC);
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '"':
+				break;
+			case '$':
+				if (IS_LABEL_START(*YYCURSOR) || *YYCURSOR == '{') {
+					break;
+				}
+				continue;
+			case '{':
+				if (*YYCURSOR == '$') {
+					break;
+				}
+				continue;
+			case '\\':
+				if (YYCURSOR < YYLIMIT) {
+					YYCURSOR++;
+				}
+				/* fall through */
+			default:
+				continue;
+		}
+
+		YYCURSOR--;
+		break;
+	}
+
+double_quotes_scan_done:
+	yyleng = YYCURSOR - SCNG(yy_text);
+
+	zend_scan_escape_string(zendlval, yytext, yyleng, '"' TSRMLS_CC);
 	return T_ENCAPSED_AND_WHITESPACE;
 }
 
-<ST_HEREDOC>{HEREDOC_CHARS}*({HEREDOC_NEWLINE}+({LABEL}";"?)?)?("{"{2,}|"$"{2,}) {
-	yyless(yyleng - 1);
-	zend_scan_escape_string(zendlval, yytext, yyleng, 0 TSRMLS_CC);
+
+<ST_BACKQUOTE>{ANY_CHAR} {
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
+	}
+	if (yytext[0] == '\\' && YYCURSOR < YYLIMIT) {
+		YYCURSOR++;
+	}
+
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '`':
+				break;
+			case '$':
+				if (IS_LABEL_START(*YYCURSOR) || *YYCURSOR == '{') {
+					break;
+				}
+				continue;
+			case '{':
+				if (*YYCURSOR == '$') {
+					break;
+				}
+				continue;
+			case '\\':
+				if (YYCURSOR < YYLIMIT) {
+					YYCURSOR++;
+				}
+				/* fall through */
+			default:
+				continue;
+		}
+
+		YYCURSOR--;
+		break;
+	}
+
+	yyleng = YYCURSOR - SCNG(yy_text);
+
+	zend_scan_escape_string(zendlval, yytext, yyleng, '`' TSRMLS_CC);
 	return T_ENCAPSED_AND_WHITESPACE;
 }
 
 
-<ST_NOWDOC>({NOWDOC_CHARS}+{NEWLINE}+|{NEWLINE}+){LABEL}";"?[\n\r] {
-	char *end = yytext + yyleng - 1;
+<ST_HEREDOC>{ANY_CHAR} {
+	int newline = 0;
 
-	if (end[-1] == ';') {
-		end--;
-		yyleng--;
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
 	}
 
-	if (yyleng > CG(heredoc_len) && !memcmp(end - CG(heredoc_len), CG(heredoc), CG(heredoc_len))) {
-		int len = yyleng - CG(heredoc_len) - 2; /* 2 for newline before and after label */
+	YYCURSOR--;
 
-		/* May have matched fooLABEL; make sure there's a newline before it */
-		if (yytext[len] != '\n') {
-			if (yytext[len] != '\r') {
-				yyless(yyleng - 1);
-				yymore();
-			}
-		} else if (len > 0 && yytext[len - 1] == '\r') {
-			len--; /* Windows newline */
-		}
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '\r':
+				if (*YYCURSOR == '\n') {
+					YYCURSOR++;
+				}
+				/* fall through */
+			case '\n':
+				/* Check for ending label on the next line */
+				if (IS_LABEL_START(*YYCURSOR) && CG(heredoc_len) < YYLIMIT - YYCURSOR && !memcmp(YYCURSOR, CG(heredoc), CG(heredoc_len))) {
+					YYCTYPE *end = YYCURSOR + CG(heredoc_len);
 
-		/* Go back before label, to match in ST_END_HEREDOC state. yytext will include
-		 * newline before label, for zend_highlight/strip, tokenizer, etc. */
-		yyless(yyleng - CG(heredoc_len) - 1); /* 1 for newline after label */
+					if (*end == ';') {
+						end++;
+					}
 
-		CG(increment_lineno) = 1; /* For newline before label */
-		BEGIN(ST_END_HEREDOC);
+					if (*end == '\n' || *end == '\r') {
+						/* newline before label will be subtracted from returned text, but
+						 * yyleng/yytext will include it, for zend_highlight/strip, tokenizer, etc. */
+						if (YYCURSOR[-2] == '\r' && YYCURSOR[-1] == '\n') {
+							newline = 2; /* Windows newline */
+						} else {
+							newline = 1;
+						}
 
-		zend_copy_value(zendlval, yytext, len);
-		zendlval->type = IS_STRING;
-		HANDLE_NEWLINES(yytext, len);
-		return T_ENCAPSED_AND_WHITESPACE;
-	} else {
-		/* Go back to end of label, so the next match works correctly in case of
-		 * another label at the beginning of the next line */
-		yyless(yyleng - 1);
-		yymore();
+						CG(increment_lineno) = 1; /* For newline before label */
+						BEGIN(ST_END_HEREDOC);
+
+						goto heredoc_scan_done;
+					}
+				}
+				continue;
+			case '$':
+				if (IS_LABEL_START(*YYCURSOR) || *YYCURSOR == '{') {
+					break;
+				}
+				continue;
+			case '{':
+				if (*YYCURSOR == '$') {
+					break;
+				}
+				continue;
+			case '\\':
+				if (YYCURSOR < YYLIMIT && *YYCURSOR != '\n' && *YYCURSOR != '\r') {
+					YYCURSOR++;
+				}
+				/* fall through */
+			default:
+				continue;
+		}
+
+		YYCURSOR--;
+		break;
 	}
-}
 
+heredoc_scan_done:
+	yyleng = YYCURSOR - SCNG(yy_text);
 
-<ST_DOUBLE_QUOTES>["] {
-	BEGIN(ST_IN_SCRIPTING);
-	return '"';
+	zend_scan_escape_string(zendlval, yytext, yyleng - newline, 0 TSRMLS_CC);
+	return T_ENCAPSED_AND_WHITESPACE;
 }
 
 
-<ST_BACKQUOTE>[`] {
-	BEGIN(ST_IN_SCRIPTING);
-	return '`';
+<ST_NOWDOC>{ANY_CHAR} {
+	int newline = 0;
+
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
+	}
+
+	YYCURSOR--;
+
+	while (YYCURSOR < YYLIMIT) {
+		switch (*YYCURSOR++) {
+			case '\r':
+				if (*YYCURSOR == '\n') {
+					YYCURSOR++;
+				}
+				/* fall through */
+			case '\n':
+				/* Check for ending label on the next line */
+				if (IS_LABEL_START(*YYCURSOR) && CG(heredoc_len) < YYLIMIT - YYCURSOR && !memcmp(YYCURSOR, CG(heredoc), CG(heredoc_len))) {
+					YYCTYPE *end = YYCURSOR + CG(heredoc_len);
+
+					if (*end == ';') {
+						end++;
+					}
+
+					if (*end == '\n' || *end == '\r') {
+						/* newline before label will be subtracted from returned text, but
+						 * yyleng/yytext will include it, for zend_highlight/strip, tokenizer, etc. */
+						if (YYCURSOR[-2] == '\r' && YYCURSOR[-1] == '\n') {
+							newline = 2; /* Windows newline */
+						} else {
+							newline = 1;
+						}
+
+						CG(increment_lineno) = 1; /* For newline before label */
+						BEGIN(ST_END_HEREDOC);
+
+						goto nowdoc_scan_done;
+					}
+				}
+				/* fall through */
+			default:
+				continue;
+		}
+	}
+
+nowdoc_scan_done:
+	yyleng = YYCURSOR - SCNG(yy_text);
+
+	zend_copy_value(zendlval, yytext, yyleng - newline);
+	zendlval->type = IS_STRING;
+	HANDLE_NEWLINES(yytext, yyleng - newline);
+	return T_ENCAPSED_AND_WHITESPACE;
 }
 
-<*>{NULL} { return 0; } /* EOF */
 
 <ST_IN_SCRIPTING,ST_VAR_OFFSET>{ANY_CHAR} {
+	if (YYCURSOR > YYLIMIT) {
+		return 0;
+	}
+
 	zend_error(E_COMPILE_WARNING,"Unexpected character in input:  '%c' (ASCII=%d) state=%d", yytext[0], yytext[0], YYSTATE);
 	goto restart;
 }
diff --git a/ext/standard/tests/strings/highlight_file.phpt b/ext/standard/tests/strings/highlight_file.phpt
index c0505d76ee..709e57dc00 100644
--- a/ext/standard/tests/strings/highlight_file.phpt
+++ b/ext/standard/tests/strings/highlight_file.phpt
@@ -50,7 +50,7 @@ bool(false)
 </span>
 </code>bool(true)
 <code><span style="color: #000000">
-<span style="color: #0000BB">&lt;?php&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #FF9900">"test&nbsp;?&gt;</span>
+<span style="color: #0000BB">&lt;?php&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"test&nbsp;?&gt;</span>
 </span>
 </code>bool(true)
 <code><span style="color: #000000">