/* 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 nounput never-interactive stack
+%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
#include "system.h"
-#include "mbswidth.h"
+
+#include <mbswidth.h>
+#include <get-errno.h>
+#include <quote.h>
+
#include "complain.h"
-#include "quote.h"
+#include "files.h"
#include "getargs.h"
#include "gram.h"
#include "reader.h"
+#include "uniqstr.h"
-/* Each time we match a string, move the end cursor to its end. */
-#define YY_USER_INIT \
-do { \
- LOCATION_RESET (*yylloc); \
- yylloc->file = infile; \
- /* This is only to avoid GCC warnings. */ \
- if (yycontrol) {;}; \
-} while (0)
-
-#define YY_USER_ACTION extend_location (yylloc, yytext, yyleng);
-#define YY_STEP LOCATION_STEP (*yylloc)
-
-#define YY_INPUT(buf, result, size) ((result) = no_cr_read (yyin, buf, size))
-
+#define YY_USER_INIT \
+ do \
+ { \
+ scanner_cursor.file = current_file; \
+ scanner_cursor.line = 1; \
+ scanner_cursor.column = 1; \
+ code_start = scanner_cursor; \
+ } \
+ while (0)
-/* Read bytes from FP into buffer BUF of size SIZE. Return the
- number of bytes read. Remove '\r' from input, treating \r\n
- and isolated \r as \n. */
+/* Location of scanner cursor. */
+boundary scanner_cursor;
-static size_t
-no_cr_read (FILE *fp, char *buf, size_t size)
-{
- size_t s = fread (buf, 1, size, fp);
- if (s)
- {
- char *w = memchr (buf, '\r', s);
- if (w)
- {
- char const *r = ++w;
- char const *lim = buf + s;
-
- for (;;)
- {
- /* Found an '\r'. Treat it like '\n', but ignore any
- '\n' that immediately follows. */
- w[-1] = '\n';
- if (r == lim)
- {
- int ch = getc (fp);
- if (ch != '\n' && ungetc (ch, fp) != ch)
- break;
- }
- else if (*r == '\n')
- r++;
-
- /* Copy until the next '\r'. */
- do
- {
- if (r == lim)
- return w - buf;
- }
- while ((*w++ = *r++) != '\r');
- }
-
- return w - buf;
- }
- }
-
- return s;
-}
-
-
-/* Extend *LOC to account for token TOKEN of size SIZE. */
-
-static void
-extend_location (location_t *loc, char const *token, int size)
-{
- int line = loc->last_line;
- int column = loc->last_column;
- char const *p0 = token;
- char const *p = token;
- char const *lim = token + size;
-
- for (p = token; p < lim; p++)
- switch (*p)
- {
- case '\r':
- /* \r shouldn't survive no_cr_read. */
- abort ();
-
- case '\n':
- line++;
- column = 1;
- p0 = p + 1;
- break;
-
- case '\t':
- column += mbsnwidth (p0, p - p0, 0);
- column += 8 - ((column - 1) & 7);
- p0 = p + 1;
- break;
- }
-
- loc->last_line = line;
- loc->last_column = column + mbsnwidth (p0, p - p0, 0);
-}
+static void adjust_location (location *, char const *, size_t);
+#define YY_USER_ACTION adjust_location (loc, yytext, yyleng);
+static size_t no_cr_read (FILE *, char *, size_t);
+#define YY_INPUT(buf, result, size) ((result) = no_cr_read (yyin, buf, size))
-/* STRING_OBSTACK -- Used to store all the characters that we need to
+/* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
keep (to construct ID, STRINGS etc.). Use the following macros to
use it.
- Use YY_OBS_GROW to append what has just been matched, and
- YY_OBS_FINISH to end the string (it puts the ending 0).
- YY_OBS_FINISH also stores this string in LAST_STRING, which can be
- used, and which is used by YY_OBS_FREE to free the last string. */
+ Use STRING_GROW to append what has just been matched, and
+ STRING_FINISH to end the string (it puts the ending 0).
+ STRING_FINISH also stores this string in LAST_STRING, which can be
+ used, and which is used by STRING_FREE to free the last string. */
+
+static struct obstack obstack_for_string;
-static struct obstack string_obstack;
-char *last_string;
+/* A string representing the most recently saved token. */
+static char *last_string;
-#define YY_OBS_GROW \
- obstack_grow (&string_obstack, yytext, yyleng)
-#define YY_OBS_FINISH \
+#define STRING_GROW \
+ obstack_grow (&obstack_for_string, yytext, yyleng)
+
+#define STRING_FINISH \
do { \
- obstack_1grow (&string_obstack, '\0'); \
- last_string = obstack_finish (&string_obstack); \
+ obstack_1grow (&obstack_for_string, '\0'); \
+ last_string = obstack_finish (&obstack_for_string); \
} while (0)
-#define YY_OBS_FREE \
- do { \
- obstack_free (&string_obstack, last_string); \
- } while (0)
+#define STRING_FREE \
+ obstack_free (&obstack_for_string, last_string)
void
scanner_last_string_free (void)
{
- YY_OBS_FREE;
+ STRING_FREE;
}
-
-static int braces_level = 0;
-static int percent_percent_count = 0;
-
/* Within well-formed rules, RULE_LENGTH is the number of values in
the current rule so far, which says where to find `$0' with respect
to the top of the stack. It is not the same as the rule->length in
Outside of well-formed rules, RULE_LENGTH has an undefined value. */
static int rule_length;
-static void handle_dollar (braced_code_t code_kind,
- char *cp, location_t location);
-static void handle_at (braced_code_t code_kind,
- char *cp, location_t location);
+static void handle_dollar (int token_type, char *cp, location loc);
+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_eof (boundary, char const *);
%}
%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
%x SC_STRING SC_CHARACTER
+%x SC_AFTER_IDENTIFIER
%x SC_ESCAPED_STRING SC_ESCAPED_CHARACTER
-%x SC_BRACED_CODE SC_PROLOGUE SC_EPILOGUE
+%x SC_PRE_CODE SC_BRACED_CODE SC_PROLOGUE SC_EPILOGUE
-letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
-id {letter}({letter}|[0-9])*
-int [0-9]+
+letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id {letter}({letter}|[0-9])*
+directive %{letter}({letter}|[0-9]|-)*
+int [0-9]+
/* POSIX says that a tag must be both an id and a C union member, but
historically almost any character is allowed in a tag. We disallow
%%
%{
- /* At each yylex invocation, mark the current position as the
- start of the next token. */
- YY_STEP;
+ /* Nesting level of the current code in braces. */
+ int braces_level IF_LINT (= 0);
+
+ /* Parent context state, when applicable. */
+ int context_state IF_LINT (= 0);
+
+ /* Token type to return, when applicable. */
+ int token_type IF_LINT (= 0);
+
+ /* Location of most recent identifier, when applicable. */
+ location id_loc IF_LINT (= empty_location);
+
+ /* 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 (= scanner_cursor);
%}
+ /*-----------------------.
+ | Scanning white space. |
+ `-----------------------*/
+
+<INITIAL,SC_AFTER_IDENTIFIER,SC_PRE_CODE>
+{
+ [ \f\n\t\v] ;
+ "," warn_at (*loc, _("stray `,' treated as white space"));
+
+ /* Comments. */
+ "//".* ;
+ "/*" {
+ token_start = loc->start;
+ context_state = YY_START;
+ BEGIN SC_YACC_COMMENT;
+ }
+
+ /* #line directives are not documented, and may be withdrawn or
+ modified in future versions of Bison. */
+ ^"#line "{int}" \"".*"\"\n" {
+ handle_syncline (yytext + sizeof "#line " - 1);
+ }
+}
+
+
/*----------------------------.
| Scanning Bison directives. |
`----------------------------*/
{
"%binary" return PERCENT_NONASSOC;
"%debug" return PERCENT_DEBUG;
+ "%default"[-_]"prec" return PERCENT_DEFAULT_PREC;
"%define" return PERCENT_DEFINE;
"%defines" return PERCENT_DEFINES;
- "%destructor" return PERCENT_DESTRUCTOR;
+ "%destructor" token_type = PERCENT_DESTRUCTOR; BEGIN SC_PRE_CODE;
"%dprec" return PERCENT_DPREC;
"%error"[-_]"verbose" return PERCENT_ERROR_VERBOSE;
"%expect" return PERCENT_EXPECT;
"%file-prefix" return PERCENT_FILE_PREFIX;
"%fixed"[-_]"output"[-_]"files" return PERCENT_YACC;
+ "%initial-action" token_type = PERCENT_INITIAL_ACTION; BEGIN SC_PRE_CODE;
"%glr-parser" return PERCENT_GLR_PARSER;
"%left" return PERCENT_LEFT;
+ "%lex-param" token_type = PERCENT_LEX_PARAM; BEGIN SC_PRE_CODE;
"%locations" return PERCENT_LOCATIONS;
"%merge" return PERCENT_MERGE;
"%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" return PERCENT_PARSE_PARAM;
+ "%parse-param" token_type = PERCENT_PARSE_PARAM; BEGIN SC_PRE_CODE;
"%prec" rule_length--; return PERCENT_PREC;
- "%printer" return PERCENT_PRINTER;
+ "%printer" token_type = PERCENT_PRINTER; BEGIN SC_PRE_CODE;
"%pure"[-_]"parser" return PERCENT_PURE_PARSER;
"%right" return PERCENT_RIGHT;
- "%lex-param" return PERCENT_LEX_PARAM;
"%skeleton" return PERCENT_SKELETON;
"%start" return PERCENT_START;
"%term" return PERCENT_TOKEN;
"%token" return PERCENT_TOKEN;
"%token"[-_]"table" return PERCENT_TOKEN_TABLE;
"%type" return PERCENT_TYPE;
- "%union" return PERCENT_UNION;
+ "%union" token_type = PERCENT_UNION; BEGIN SC_PRE_CODE;
"%verbose" return PERCENT_VERBOSE;
"%yacc" return PERCENT_YACC;
+ {directive} {
+ complain_at (*loc, _("invalid directive: %s"), quote (yytext));
+ }
+
"=" return EQUAL;
- ":" rule_length = 0; return COLON;
"|" rule_length = 0; return PIPE;
- "," return COMMA;
";" return SEMICOLON;
- [ \f\n\t\v]+ YY_STEP;
-
- {id} {
- yylval->symbol = symbol_get (yytext, *yylloc);
+ {id} {
+ val->symbol = symbol_get (yytext, *loc);
+ id_loc = *loc;
rule_length++;
- return ID;
+ BEGIN SC_AFTER_IDENTIFIER;
}
{int} {
unsigned long num;
- errno = 0;
+ set_errno (0);
num = strtoul (yytext, 0, 10);
- if (INT_MAX < num || errno)
+ if (INT_MAX < num || get_errno ())
{
- complain_at (*yylloc, _("invalid value: %s"), quote (yytext));
+ complain_at (*loc, _("integer out of range: %s"), quote (yytext));
num = INT_MAX;
}
- yylval->integer = num;
+ val->integer = num;
return INT;
}
/* Characters. We don't check there is only one. */
- "'" YY_OBS_GROW; yy_push_state (SC_ESCAPED_CHARACTER);
+ "'" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
- "\"" YY_OBS_GROW; yy_push_state (SC_ESCAPED_STRING);
-
- /* Comments. */
- "/*" BEGIN SC_YACC_COMMENT;
- "//".* YY_STEP;
+ "\"" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_STRING;
/* Prologue. */
- "%{" yy_push_state (SC_PROLOGUE);
+ "%{" code_start = loc->start; BEGIN SC_PROLOGUE;
/* Code in between braces. */
- "{" YY_OBS_GROW; ++braces_level; yy_push_state (SC_BRACED_CODE);
+ "{" {
+ STRING_GROW;
+ token_type = BRACED_CODE;
+ braces_level = 0;
+ code_start = loc->start;
+ BEGIN SC_BRACED_CODE;
+ }
/* A type. */
"<"{tag}">" {
- obstack_grow (&string_obstack, yytext + 1, yyleng - 2);
- YY_OBS_FINISH;
- yylval->string = last_string;
+ obstack_grow (&obstack_for_string, yytext + 1, yyleng - 2);
+ STRING_FINISH;
+ val->uniqstr = uniqstr_new (last_string);
+ STRING_FREE;
return TYPE;
}
-
- "%%" {
+ "%%" {
+ static int percent_percent_count;
if (++percent_percent_count == 2)
- yy_push_state (SC_EPILOGUE);
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
- . {
- complain_at (*yylloc, _("invalid character: %s"), quote (yytext));
- YY_STEP;
+ . {
+ complain_at (*loc, _("invalid character: %s"), quote (yytext));
+ }
+
+ <<EOF>> {
+ loc->start = loc->end = scanner_cursor;
+ yyterminate ();
}
}
- /*-------------------------------------------------------------------.
- | Whatever the start condition (but those which correspond to |
- | entities `swallowed' by Bison: SC_YACC_COMMENT, SC_ESCAPED_STRING, |
- | and SC_ESCAPED_CHARACTER), no M4 character must escape as is. |
- `-------------------------------------------------------------------*/
+ /*-----------------------------------------------------------------.
+ | Scanning after an identifier, checking whether a colon is next. |
+ `-----------------------------------------------------------------*/
-<SC_COMMENT,SC_LINE_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
+<SC_AFTER_IDENTIFIER>
{
- \[ obstack_sgrow (&string_obstack, "@<:@");
- \] obstack_sgrow (&string_obstack, "@:>@");
+ ":" {
+ rule_length = 0;
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID_COLON;
+ }
+ . {
+ scanner_cursor.column -= mbsnwidth (yytext, yyleng, 0);
+ yyless (0);
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID;
+ }
+ <<EOF>> {
+ *loc = id_loc;
+ BEGIN INITIAL;
+ return ID;
+ }
}
<SC_YACC_COMMENT>
{
- "*/" {
- YY_STEP;
- BEGIN INITIAL;
- }
-
- [^*]+|"*" ;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a comment"));
- BEGIN INITIAL;
- }
+ "*/" BEGIN context_state;
+ .|\n ;
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
<SC_COMMENT>
{
- "*"{splice}"/" YY_OBS_GROW; yy_pop_state ();
- [^*\[\]]+|"*" YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a comment"));
- yy_pop_state ();
- }
+ "*"{splice}"/" STRING_GROW; BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
<SC_LINE_COMMENT>
{
- "\n" YY_OBS_GROW; yy_pop_state ();
- ([^\n\[\]]|{splice})+ YY_OBS_GROW;
- <<EOF>> yy_pop_state ();
+ "\n" STRING_GROW; BEGIN context_state;
+ {splice} STRING_GROW;
+ <<EOF>> BEGIN context_state;
}
<SC_ESCAPED_STRING>
{
"\"" {
- assert (yy_top_state () == INITIAL);
- YY_OBS_GROW;
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
+ STRING_GROW;
+ STRING_FINISH;
+ loc->start = token_start;
+ val->chars = last_string;
rule_length++;
+ BEGIN INITIAL;
return STRING;
}
- [^\"\\]+ YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a string"));
- assert (yy_top_state () == INITIAL);
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return STRING;
- }
+ .|\n STRING_GROW;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
/*---------------------------------------------------------------.
<SC_ESCAPED_CHARACTER>
{
"'" {
- YY_OBS_GROW;
- assert (yy_top_state () == INITIAL);
- {
- YY_OBS_FINISH;
- yylval->symbol = symbol_get (last_string, *yylloc);
- symbol_class_set (yylval->symbol, token_sym, *yylloc);
- symbol_user_token_number_set (yylval->symbol,
- (unsigned char) last_string[1], *yylloc);
- YY_OBS_FREE;
- yy_pop_state ();
- rule_length++;
- return ID;
- }
+ unsigned char last_string_1;
+ STRING_GROW;
+ STRING_FINISH;
+ loc->start = token_start;
+ val->symbol = symbol_get (last_string, *loc);
+ symbol_class_set (val->symbol, token_sym, *loc);
+ last_string_1 = last_string[1];
+ symbol_user_token_number_set (val->symbol, last_string_1, *loc);
+ STRING_FREE;
+ rule_length++;
+ BEGIN INITIAL;
+ return ID;
}
- [^\'\\]+ YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a character"));
- assert (yy_top_state () == INITIAL);
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return CHARACTER;
- }
+ .|\n STRING_GROW;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
}
\\[0-7]{1,3} {
unsigned long c = strtoul (yytext + 1, 0, 8);
if (UCHAR_MAX < c)
- {
- complain_at (*yylloc, _("invalid escape: %s"), quote (yytext));
- YY_STEP;
- }
+ complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else
- obstack_1grow (&string_obstack, c);
+ obstack_1grow (&obstack_for_string, c);
}
- \\x[0-9a-fA-F]+ {
+ \\x[0-9abcdefABCDEF]+ {
unsigned long c;
- errno = 0;
+ set_errno (0);
c = strtoul (yytext + 2, 0, 16);
- if (UCHAR_MAX < c || errno)
- {
- complain_at (*yylloc, _("invalid escape: %s"), quote (yytext));
- YY_STEP;
- }
+ if (UCHAR_MAX < c || get_errno ())
+ complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else
- obstack_1grow (&string_obstack, c);
+ obstack_1grow (&obstack_for_string, c);
}
- \\a obstack_1grow (&string_obstack, '\a');
- \\b obstack_1grow (&string_obstack, '\b');
- \\f obstack_1grow (&string_obstack, '\f');
- \\n obstack_1grow (&string_obstack, '\n');
- \\r obstack_1grow (&string_obstack, '\r');
- \\t obstack_1grow (&string_obstack, '\t');
- \\v obstack_1grow (&string_obstack, '\v');
- \\[\"\'?\\] obstack_1grow (&string_obstack, yytext[1]);
- \\(u|U[0-9a-fA-F]{4})[0-9a-fA-F]{4} {
+ \\a obstack_1grow (&obstack_for_string, '\a');
+ \\b obstack_1grow (&obstack_for_string, '\b');
+ \\f obstack_1grow (&obstack_for_string, '\f');
+ \\n obstack_1grow (&obstack_for_string, '\n');
+ \\r obstack_1grow (&obstack_for_string, '\r');
+ \\t obstack_1grow (&obstack_for_string, '\t');
+ \\v obstack_1grow (&obstack_for_string, '\v');
+
+ /* \\[\"\'?\\] would be shorter, but it confuses xgettext. */
+ \\("\""|"'"|"?"|"\\") obstack_1grow (&obstack_for_string, yytext[1]);
+
+ \\(u|U[0-9abcdefABCDEF]{4})[0-9abcdefABCDEF]{4} {
int c = convert_ucn_to_byte (yytext);
if (c < 0)
- {
- complain_at (*yylloc, _("invalid escape: %s"), quote (yytext));
- YY_STEP;
- }
+ complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else
- obstack_1grow (&string_obstack, c);
+ obstack_1grow (&obstack_for_string, c);
}
\\(.|\n) {
- complain_at (*yylloc, _("unrecognized escape: %s"), quote (yytext));
- YY_OBS_GROW;
+ complain_at (*loc, _("unrecognized escape sequence: %s"), quote (yytext));
+ STRING_GROW;
}
- /* FLex wants this rule, in case of a `\<<EOF>>'. */
- \\ YY_OBS_GROW;
}
<SC_CHARACTER>
{
- "'" {
- YY_OBS_GROW;
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
-
- [^'\[\]\\]+ YY_OBS_GROW;
- \\{splice}[^\[\]] YY_OBS_GROW;
- {splice} YY_OBS_GROW;
- /* Needed for `\<<EOF>>', `\\<<newline>>[', and `\\<<newline>>]'. */
- \\ YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a character"));
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
+ "'" STRING_GROW; BEGIN context_state;
+ \\{splice}[^$@\[\]] STRING_GROW;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
<SC_STRING>
{
- "\"" {
- assert (yy_top_state () != INITIAL);
- YY_OBS_GROW;
- yy_pop_state ();
- }
-
- [^\"\[\]\\]+ YY_OBS_GROW;
- \\{splice}[^\[\]] YY_OBS_GROW;
- {splice} YY_OBS_GROW;
- /* Needed for `\<<EOF>>', `\\<<newline>>[', and `\\<<newline>>]'. */
- \\ YY_OBS_GROW;
-
+ "\"" STRING_GROW; BEGIN context_state;
+ \\{splice}[^$@\[\]] STRING_GROW;
<<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a string"));
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
+ unexpected_eof (token_start, "\"");
+ BEGIN context_state;
}
}
<SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
{
- /* Characters. We don't check there is only one. */
- "'" YY_OBS_GROW; yy_push_state (SC_CHARACTER);
+ "'" {
+ STRING_GROW;
+ context_state = YY_START;
+ token_start = loc->start;
+ BEGIN SC_CHARACTER;
+ }
+ "\"" {
+ STRING_GROW;
+ context_state = YY_START;
+ token_start = loc->start;
+ BEGIN SC_STRING;
+ }
+ "/"{splice}"*" {
+ STRING_GROW;
+ context_state = YY_START;
+ token_start = loc->start;
+ BEGIN SC_COMMENT;
+ }
+ "/"{splice}"/" {
+ STRING_GROW;
+ context_state = YY_START;
+ BEGIN SC_LINE_COMMENT;
+ }
+}
- /* Strings. */
- "\"" YY_OBS_GROW; yy_push_state (SC_STRING);
- /* Comments. */
- "/"{splice}"*" YY_OBS_GROW; yy_push_state (SC_COMMENT);
- "/"{splice}"/" YY_OBS_GROW; yy_push_state (SC_LINE_COMMENT);
+ /*---------------------------------------------------------------.
+ | Scanning after %union etc., possibly followed by white space. |
+ | For %union only, allow arbitrary C code to appear before the |
+ | following brace, as an extension to POSIX. |
+ `---------------------------------------------------------------*/
- /* Not comments. */
- "/" YY_OBS_GROW;
+<SC_PRE_CODE>
+{
+ . {
+ bool valid = yytext[0] == '{' || token_type == PERCENT_UNION;
+ scanner_cursor.column -= mbsnwidth (yytext, yyleng, 0);
+ yyless (0);
+
+ if (valid)
+ {
+ braces_level = -1;
+ code_start = loc->start;
+ BEGIN SC_BRACED_CODE;
+ }
+ else
+ {
+ complain_at (*loc, _("missing `{' in `%s'"),
+ token_name (token_type));
+ obstack_sgrow (&obstack_for_string, "{}");
+ STRING_FINISH;
+ val->chars = last_string;
+ BEGIN INITIAL;
+ return token_type;
+ }
+ }
+
+ <<EOF>> unexpected_eof (scanner_cursor, "{}"); BEGIN INITIAL;
}
<SC_BRACED_CODE>
{
+ "{"|"<"{splice}"%" STRING_GROW; braces_level++;
+ "%"{splice}">" STRING_GROW; braces_level--;
"}" {
- YY_OBS_GROW;
- if (--braces_level == 0)
+ bool outer_brace = --braces_level < 0;
+
+ /* As an undocumented Bison extension, append `;' before the last
+ brace in braced code, so that the user code can omit trailing
+ `;'. But do not append `;' if emulating Yacc, since Yacc does
+ not append one.
+
+ FIXME: Bison should warn if a semicolon seems to be necessary
+ here, and should omit the semicolon if it seems unnecessary
+ (e.g., after ';', '{', or '}', each followed by comments or
+ white space). Such a warning shouldn't depend on --yacc; it
+ should depend on a new --pedantic option, which would cause
+ Bison to warn if it detects an extension to POSIX. --pedantic
+ 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 && token_type == BRACED_CODE && ! yacc_flag)
+ obstack_1grow (&obstack_for_string, ';');
+
+ obstack_1grow (&obstack_for_string, '}');
+
+ if (outer_brace)
{
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ STRING_FINISH;
rule_length++;
- return BRACED_CODE;
+ loc->start = code_start;
+ val->chars = last_string;
+ BEGIN INITIAL;
+ return token_type;
}
}
- "{" YY_OBS_GROW; braces_level++;
-
- "$"("<"{tag}">")?(-?[0-9]+|"$") { handle_dollar (current_braced_code,
- yytext, *yylloc); }
- "@"(-?[0-9]+|"$") { handle_at (current_braced_code,
- yytext, *yylloc); }
+ /* Tokenize `<<%' correctly (as `<<' `%') rather than incorrrectly
+ (as `<' `<%'). */
+ "<"{splice}"<" STRING_GROW;
- [^$@\[\]/\'\"\{\}]+ YY_OBS_GROW;
-
- /* A stray $, or /, or etc. */
- . YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a braced code"));
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return BRACED_CODE;
- }
+ "$"("<"{tag}">")?(-?[0-9]+|"$") handle_dollar (token_type, yytext, *loc);
+ "@"(-?[0-9]+|"$") handle_at (token_type, yytext, *loc);
+ <<EOF>> unexpected_eof (code_start, "}"); BEGIN INITIAL;
}
<SC_PROLOGUE>
{
"%}" {
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ STRING_FINISH;
+ loc->start = code_start;
+ val->chars = last_string;
+ BEGIN INITIAL;
return PROLOGUE;
}
- [^%\[\]/\'\"]+ YY_OBS_GROW;
- "%" YY_OBS_GROW;
-
- <<EOF>> {
- complain_at (*yylloc, _("unexpected end of file in a prologue"));
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return PROLOGUE;
- }
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
<SC_EPILOGUE>
{
- [^\[\]]+ YY_OBS_GROW;
-
<<EOF>> {
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
+ STRING_FINISH;
+ loc->start = code_start;
+ val->chars = last_string;
+ BEGIN INITIAL;
return EPILOGUE;
}
}
+ /*----------------------------------------------------------------.
+ | By default, grow the string obstack with the input, escaping M4 |
+ | quoting characters. |
+ `----------------------------------------------------------------*/
+
+<SC_COMMENT,SC_LINE_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
+{
+ \$ obstack_sgrow (&obstack_for_string, "$][");
+ \@ obstack_sgrow (&obstack_for_string, "@@");
+ \[ obstack_sgrow (&obstack_for_string, "@{");
+ \] obstack_sgrow (&obstack_for_string, "@}");
+ .|\n STRING_GROW;
+}
+
+
%%
+/* Keeps track of the maximum number of semantic values to the left of
+ a handle (those referenced by $0, $-1, etc.) are required by the
+ semantic actions of this grammar. */
+int max_left_semantic_context = 0;
+
+/* Set *LOC and adjust scanner cursor to account for token TOKEN of
+ size SIZE. */
+
+static void
+adjust_location (location *loc, char const *token, size_t size)
+{
+ int line = scanner_cursor.line;
+ int column = scanner_cursor.column;
+ char const *p0 = token;
+ char const *p = token;
+ char const *lim = token + size;
+
+ loc->start = scanner_cursor;
+
+ for (p = token; p < lim; p++)
+ switch (*p)
+ {
+ case '\n':
+ line++;
+ column = 1;
+ p0 = p + 1;
+ break;
+
+ case '\t':
+ column += mbsnwidth (p0, p - p0, 0);
+ column += 8 - ((column - 1) & 7);
+ p0 = p + 1;
+ break;
+ }
+
+ scanner_cursor.line = line;
+ scanner_cursor.column = column + mbsnwidth (p0, p - p0, 0);
+
+ loc->end = scanner_cursor;
+}
+
+
+/* Read bytes from FP into buffer BUF of size SIZE. Return the
+ number of bytes read. Remove '\r' from input, treating \r\n
+ and isolated \r as \n. */
+
+static size_t
+no_cr_read (FILE *fp, char *buf, size_t size)
+{
+ size_t bytes_read = fread (buf, 1, size, fp);
+ if (bytes_read)
+ {
+ char *w = memchr (buf, '\r', bytes_read);
+ if (w)
+ {
+ char const *r = ++w;
+ char const *lim = buf + bytes_read;
+
+ for (;;)
+ {
+ /* Found an '\r'. Treat it like '\n', but ignore any
+ '\n' that immediately follows. */
+ w[-1] = '\n';
+ if (r == lim)
+ {
+ int ch = getc (fp);
+ if (ch != '\n' && ungetc (ch, fp) != ch)
+ break;
+ }
+ else if (*r == '\n')
+ r++;
+
+ /* Copy until the next '\r'. */
+ do
+ {
+ if (r == lim)
+ return w - buf;
+ }
+ while ((*w++ = *r++) != '\r');
+ }
+
+ return w - buf;
+ }
+ }
+
+ return bytes_read;
+}
+
+
/*------------------------------------------------------------------.
| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
| |
| Possible inputs: $[<TYPENAME>]($|integer) |
| |
-| Output to the STRING_OBSTACK a reference to this semantic value. |
+| Output to OBSTACK_FOR_STRING a reference to this semantic value. |
`------------------------------------------------------------------*/
-static inline void
-handle_action_dollar (char *text, location_t location)
+static inline bool
+handle_action_dollar (char *text, location loc)
{
const char *type_name = NULL;
char *cp = text + 1;
+ if (! current_rule)
+ return false;
+
/* Get the type name if explicit. */
if (*cp == '<')
{
if (*cp == '$')
{
if (!type_name)
- type_name = symbol_list_n_type_name_get (current_rule, location, 0);
+ type_name = symbol_list_n_type_name_get (current_rule, loc, 0);
if (!type_name && typed)
- complain_at (location, _("$$ of `%s' has no declared type"),
+ complain_at (loc, _("$$ of `%s' has no declared type"),
current_rule->sym->tag);
if (!type_name)
type_name = "";
- obstack_fgrow1 (&string_obstack,
+ obstack_fgrow1 (&obstack_for_string,
"]b4_lhs_value([%s])[", type_name);
}
else
{
long num;
- errno = 0;
+ set_errno (0);
num = strtol (cp, 0, 10);
- if (INT_MIN <= num && num <= rule_length && ! errno)
+ if (INT_MIN <= num && num <= rule_length && ! get_errno ())
{
int n = num;
+ if (1-n > max_left_semantic_context)
+ max_left_semantic_context = 1-n;
if (!type_name && n > 0)
- type_name = symbol_list_n_type_name_get (current_rule, location,
- n);
+ type_name = symbol_list_n_type_name_get (current_rule, loc, n);
if (!type_name && typed)
- complain_at (location, _("$%d of `%s' has no declared type"),
- n, current_rule->sym->tag);
+ complain_at (loc, _("$%d of `%s' has no declared type"),
+ n, current_rule->sym->tag);
if (!type_name)
type_name = "";
- obstack_fgrow3 (&string_obstack,
+ obstack_fgrow3 (&obstack_for_string,
"]b4_rhs_value([%d], [%d], [%s])[",
rule_length, n, type_name);
}
else
- complain_at (location, _("invalid value: %s"), quote (text));
+ complain_at (loc, _("integer out of range: %s"), quote (text));
}
-}
-
-/*---------------------------------------------------------------.
-| TEXT is expected to be $$ in some code associated to a symbol: |
-| destructor or printer. |
-`---------------------------------------------------------------*/
-
-static inline void
-handle_symbol_code_dollar (char *text, location_t location)
-{
- char *cp = text + 1;
- if (*cp == '$')
- obstack_sgrow (&string_obstack, "]b4_dollar_dollar[");
- else
- complain_at (location, _("invalid value: %s"), quote (text));
+ return true;
}
-/*-----------------------------------------------------------------.
-| Dispatch onto handle_action_dollar, or handle_destructor_dollar, |
-| depending upon CODE_KIND. |
-`-----------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Map `$?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
+| (are we in an action?). |
+`----------------------------------------------------------------*/
static void
-handle_dollar (braced_code_t braced_code_kind,
- char *text, location_t location)
+handle_dollar (int token_type, char *text, location loc)
{
- switch (braced_code_kind)
+ switch (token_type)
{
- case action_braced_code:
- handle_action_dollar (text, location);
+ case BRACED_CODE:
+ if (handle_action_dollar (text, loc))
+ return;
break;
- case destructor_braced_code:
- case printer_braced_code:
- handle_symbol_code_dollar (text, location);
+ case PERCENT_DESTRUCTOR:
+ case PERCENT_INITIAL_ACTION:
+ case PERCENT_PRINTER:
+ if (text[1] == '$')
+ {
+ obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
+ return;
+ }
+ break;
+
+ default:
break;
}
+
+ complain_at (loc, _("invalid value: %s"), quote (text));
}
/*------------------------------------------------------.
| TEXT is a location token (i.e., a `@...'). Output to |
-| STRING_OBSTACK a reference to this location. |
+| OBSTACK_FOR_STRING a reference to this location. |
`------------------------------------------------------*/
-static inline void
-handle_action_at (char *text, location_t location)
+static inline bool
+handle_action_at (char *text, location loc)
{
char *cp = text + 1;
- locations_flag = 1;
+ locations_flag = true;
+
+ if (! current_rule)
+ return false;
if (*cp == '$')
- {
- obstack_sgrow (&string_obstack, "]b4_lhs_location[");
- }
+ obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
else
{
long num;
- errno = 0;
+ set_errno (0);
num = strtol (cp, 0, 10);
- if (INT_MIN <= num && num <= rule_length && ! errno)
+ if (INT_MIN <= num && num <= rule_length && ! get_errno ())
{
int n = num;
- obstack_fgrow2 (&string_obstack, "]b4_rhs_location([%d], [%d])[",
+ obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location([%d], [%d])[",
rule_length, n);
}
else
- complain_at (location, _("invalid value: %s"), quote (text));
+ complain_at (loc, _("integer out of range: %s"), quote (text));
}
-}
-
-
-/*---------------------------------------------------------------.
-| TEXT is expected to be @$ in some code associated to a symbol: |
-| destructor or printer. |
-`---------------------------------------------------------------*/
-static inline void
-handle_symbol_code_at (char *text, location_t location)
-{
- char *cp = text + 1;
- if (*cp == '$')
- obstack_sgrow (&string_obstack, "]b4_at_dollar[");
- else
- complain_at (location, _("invalid value: %s"), quote (text));
+ return true;
}
-/*-------------------------------------------------------------------.
-| Dispatch onto handle_action_at, or handle_destructor_at, depending |
-| upon CODE_KIND. |
-`-------------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Map `@?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
+| (are we in an action?). |
+`----------------------------------------------------------------*/
static void
-handle_at (braced_code_t braced_code_kind,
- char *text, location_t location)
+handle_at (int token_type, char *text, location loc)
{
- switch (braced_code_kind)
+ switch (token_type)
{
- case action_braced_code:
- handle_action_at (text, location);
+ case BRACED_CODE:
+ handle_action_at (text, loc);
+ return;
+
+ case PERCENT_INITIAL_ACTION:
+ case PERCENT_DESTRUCTOR:
+ case PERCENT_PRINTER:
+ if (text[1] == '$')
+ {
+ obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
+ return;
+ }
break;
- case destructor_braced_code:
- case printer_braced_code:
- handle_symbol_code_at (text, location);
+ default:
break;
}
+
+ complain_at (loc, _("invalid value: %s"), quote (text));
}
/* A non-ASCII host. Use CODE to index into a table of the C
basic execution character set, which is guaranteed to exist on
all Standard C platforms. This table also includes '$', '@',
- and '`', which not in the basic execution character set but
+ and '`', which are not in the basic execution character set but
which are unibyte characters on all the platforms that we know
about. */
static signed char const table[] =
}
+/*----------------------------------------------------------------.
+| Handle `#line INT "FILE"'. ARGS has already skipped `#line '. |
+`----------------------------------------------------------------*/
+
+static void
+handle_syncline (char *args)
+{
+ int lineno = strtol (args, &args, 10);
+ const char *file = NULL;
+ file = strchr (args, '"') + 1;
+ *strchr (file, '"') = 0;
+ scanner_cursor.file = current_file = xstrdup (file);
+ scanner_cursor.line = lineno;
+ scanner_cursor.column = 1;
+}
+
+
+/*------------------------------------------------------------------------.
+| 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. |
+`------------------------------------------------------------------------*/
+
+static void
+unexpected_eof (boundary start, char const *token_end)
+{
+ location loc;
+ loc.start = start;
+ loc.end = scanner_cursor;
+ complain_at (loc, _("missing `%s' at end of file"), token_end);
+}
+
+
/*-------------------------.
| Initialize the scanner. |
`-------------------------*/
void
scanner_initialize (void)
{
- obstack_init (&string_obstack);
+ obstack_init (&obstack_for_string);
}
void
scanner_free (void)
{
- obstack_free (&string_obstack, 0);
+ obstack_free (&obstack_for_string, 0);
/* Reclaim Flex's buffers. */
yy_delete_buffer (YY_CURRENT_BUFFER);
}
projects / bison.git / blobdiff