/* Bison Grammar Scanner -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
02111-1307 USA
*/
-%option debug nodefault noyywrap never-interactive
+%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
scanner_cursor.file = current_file; \
scanner_cursor.line = 1; \
scanner_cursor.column = 1; \
+ code_start = scanner_cursor; \
} \
while (0)
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
int token_type IF_LINT (= 0);
/* Location of most recent identifier, when applicable. */
- location id_loc IF_LINT (= *loc);
+ location id_loc IF_LINT (= empty_location);
- /* Where containing code started, when applicable. */
- boundary code_start IF_LINT (= loc->start);
+ /* Where containing code started, when applicable. Its initial
+ value is relevant only when yylex is invoked in the SC_EPILOGUE
+ start condition. */
+ boundary code_start = scanner_cursor;
/* Where containing comment or string or character literal started,
when applicable. */
- boundary token_start IF_LINT (= loc->start);
+ boundary token_start IF_LINT (= scanner_cursor);
%}
"%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
"%no"[-_]"lines" return PERCENT_NO_LINES;
"%nonassoc" return PERCENT_NONASSOC;
+ "%nondeterministic-parser" return PERCENT_NONDETERMINISTIC_PARSER;
"%nterm" return PERCENT_NTERM;
"%output" return PERCENT_OUTPUT;
"%parse-param" token_type = PERCENT_PARSE_PARAM; BEGIN SC_PRE_CODE;
"%%" {
static int percent_percent_count;
if (++percent_percent_count == 2)
- {
- code_start = loc->start;
- BEGIN SC_EPILOGUE;
- }
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
. {
complain_at (*loc, _("invalid character: %s"), quote (yytext));
}
+
+ <<EOF>> {
+ loc->start = loc->end = scanner_cursor;
+ yyterminate ();
+ }
}
{
"*/" BEGIN context_state;
.|\n ;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
<SC_COMMENT>
{
"*"{splice}"/" STRING_GROW; BEGIN context_state;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
}
.|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
/*---------------------------------------------------------------.
}
.|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
}
{
"'" STRING_GROW; BEGIN context_state;
\\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
{
"\"" STRING_GROW; BEGIN context_state;
\\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ <<EOF>> {
+ unexpected_eof (token_start, "\"");
+ BEGIN context_state;
+ }
}
return token_type;
}
}
+
+ <<EOF>> unexpected_eof (scanner_cursor, "{}"); BEGIN INITIAL;
}
should also diagnose other Bison extensions like %yacc.
Perhaps there should also be a GCC-style --pedantic-errors
option, so that such warnings are diagnosed as errors. */
- if (outer_brace && ! yacc_flag)
+ if (outer_brace && token_type == BRACED_CODE && ! yacc_flag)
obstack_1grow (&obstack_for_string, ';');
obstack_1grow (&obstack_for_string, '}');
"$"("<"{tag}">")?(-?[0-9]+|"$") 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;
}
return PROLOGUE;
}
- <<EOF>> unexpected_end_of_file (code_start, "%}");
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
static size_t
no_cr_read (FILE *fp, char *buf, size_t size)
{
- size_t s = fread (buf, 1, size, fp);
- if (s)
+ size_t bytes_read = fread (buf, 1, size, fp);
+ if (bytes_read)
{
- char *w = memchr (buf, '\r', s);
+ char *w = memchr (buf, '\r', bytes_read);
if (w)
{
char const *r = ++w;
- char const *lim = buf + s;
+ char const *lim = buf + bytes_read;
for (;;)
{
}
}
- return s;
+ return bytes_read;
}
/*------------------------------------------------------------------------.
| 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]);
}