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Re: [PATCH] scan-gram.l: for flex-2.5.31: move unput call into body
From: |
Paul Eggert |
Subject: |
Re: [PATCH] scan-gram.l: for flex-2.5.31: move unput call into body |
Date: |
18 Apr 2003 00:56:53 -0700 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 |
Peter Muir <address@hidden> writes:
> the debian maintainer for flex says the behaviour of flex is correct
> (and suggested to move the function inside %{...%}).
That doesn't work, for reasons discussed in my email of a few minutes ago.
Thanks for the bug report, though. I installed the following patch.
2003-04-17 Paul Eggert <address@hidden>
* src/scan-gram.l: Add %option nounput, since we no longer use unput.
(unexpected_eof): Renamed from unexpected_end_of_file, for brevity.
Do not insert the expected token via unput, as this runs afoul
of a POSIX-compatibility bug in flex 2.5.31.
All uses changed to BEGIN the parent state,
since we no longer insert the expected token via unput.
* tests/regression.at (Invalid inputs): Remove cascaded diagnostic
that is no longer emitted after the above change.
--- src/scan-gram.l 13 Mar 2003 07:07:17 -0000 1.58
+++ src/scan-gram.l 18 Apr 2003 07:26:19 -0000 1.59
@@ -20,7 +20,7 @@
02111-1307 USA
*/
-%option debug nodefault noyywrap never-interactive
+%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
@@ -102,7 +102,7 @@ static void handle_dollar (int token_typ
static void handle_at (int token_type, char *cp, location loc);
static void handle_syncline (char *args);
static int convert_ucn_to_byte (char const *hex_text);
-static void unexpected_end_of_file (boundary, char const *);
+static void unexpected_eof (boundary, char const *);
%}
%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
@@ -323,7 +323,7 @@ splice (\\[ \f\t\v]*\n)*
{
"*/" BEGIN context_state;
.|\n ;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
@@ -334,7 +334,7 @@ splice (\\[ \f\t\v]*\n)*
<SC_COMMENT>
{
"*"{splice}"/" STRING_GROW; BEGIN context_state;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
@@ -368,7 +368,7 @@ splice (\\[ \f\t\v]*\n)*
}
.|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
/*---------------------------------------------------------------.
@@ -394,7 +394,7 @@ splice (\\[ \f\t\v]*\n)*
}
.|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
}
@@ -456,7 +456,7 @@ splice (\\[ \f\t\v]*\n)*
{
"'" STRING_GROW; BEGIN context_state;
address@hidden STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
@@ -469,7 +469,10 @@ splice (\\[ \f\t\v]*\n)*
{
"\"" STRING_GROW; BEGIN context_state;
address@hidden STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ <<EOF>> {
+ unexpected_eof (token_start, "\"");
+ BEGIN context_state;
+ }
}
@@ -536,7 +539,7 @@ splice (\\[ \f\t\v]*\n)*
}
}
- <<EOF>> unexpected_end_of_file (scanner_cursor, "{}");
+ <<EOF>> unexpected_eof (scanner_cursor, "{}"); BEGIN INITIAL;
}
@@ -589,7 +592,7 @@ splice (\\[ \f\t\v]*\n)*
"$"("<"{tag}">")?(-?[0-9]+|"$") handle_dollar (token_type, yytext, *loc);
"@"(-?[0-9]+|"$") handle_at (token_type, yytext, *loc);
- <<EOF>> unexpected_end_of_file (code_start, "}");
+ <<EOF>> unexpected_eof (code_start, "}"); BEGIN INITIAL;
}
@@ -607,7 +610,7 @@ splice (\\[ \f\t\v]*\n)*
return PROLOGUE;
}
- <<EOF>> unexpected_end_of_file (code_start, "%}");
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
@@ -971,25 +974,15 @@ handle_syncline (char *args)
/*------------------------------------------------------------------------.
| Report an unexpected EOF in a token or comment starting at START. |
| An end of file was encountered and the expected TOKEN_END was missing. |
-| After reporting the problem, pretend that TOKEN_END was found. |
`------------------------------------------------------------------------*/
static void
-unexpected_end_of_file (boundary start, char const *token_end)
+unexpected_eof (boundary start, char const *token_end)
{
- size_t i = strlen (token_end);
-
location loc;
loc.start = start;
loc.end = scanner_cursor;
complain_at (loc, _("missing `%s' at end of file"), token_end);
-
- /* Adjust scanner cursor so that any later message does not count
- the characters about to be inserted. */
- scanner_cursor.column -= i;
-
- while (i != 0)
- unput (token_end[--i]);
}
--- tests/regression.at 2 Mar 2003 13:36:55 -0000 1.79
+++ tests/regression.at 18 Apr 2003 07:26:46 -0000 1.80
@@ -298,7 +298,6 @@ input.y:5.1-17: invalid directive: `%a-d
input.y:6.1: invalid character: `%'
input.y:6.2: invalid character: `-'
input.y:7.1-8.0: missing `%}' at end of file
-input.y:7.1-8.0: syntax error, unexpected "%{...%}"
]])
AT_CLEANUP