02111-1307 USA
*/
-%option debug nodefault noyywrap nounput never-interactive stack
+%option debug nodefault noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
#include "system.h"
+#include "mbswidth.h"
#include "complain.h"
#include "quote.h"
#include "getargs.h"
#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 LOCATION_COLUMNS (*yylloc, yyleng)
-#define YY_LINES LOCATION_LINES (*yylloc, yyleng); lineno += yyleng;
+#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))
+
+
+/* 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 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);
+}
+
+
/* STRING_OBSTACK -- Used to store all the characters that we need to
keep (to construct ID, STRINGS etc.). Use the following macros to
used, and which is used by YY_OBS_FREE to free the last string. */
static struct obstack string_obstack;
-char *last_string;
#define YY_OBS_GROW \
obstack_grow (&string_obstack, yytext, yyleng)
last_string = obstack_finish (&string_obstack); \
} while (0)
-#define YY_OBS_FREE \
- do { \
- obstack_free (&string_obstack, last_string); \
- } while (0)
-
-void
-scanner_last_string_free (void)
-{
- YY_OBS_FREE;
-}
+#define YY_OBS_FREE \
+ obstack_free (&string_obstack, last_string)
+/* 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
+ the case of mid rule actions.
-static int braces_level = 0;
-static int percent_percent_count = 0;
+ Outside of well-formed rules, RULE_LENGTH has an undefined value. */
+static int rule_length;
-static void handle_dollar PARAMS ((char *cp, location_t location));
-static void handle_at PARAMS ((char *cp));
+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_syncline (char *args, location_t *location);
+static int convert_ucn_to_byte (char const *hex_text);
+static void unexpected_end_of_file (location_t *, char const *);
%}
-%x SC_COMMENT
+%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
%x SC_STRING SC_CHARACTER
%x SC_ESCAPED_STRING SC_ESCAPED_CHARACTER
%x SC_BRACED_CODE SC_PROLOGUE SC_EPILOGUE
-id [.a-zA-Z][.a-zA-Z_0-9]*
-int [0-9]+
-eols (\n|\r|\n\r|\r\n)+
-blanks [ \t\f]+
+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
+ NUL and newline, as this simplifies our implementation. */
+tag [^\0\n>]+
+
+/* Zero or more instances of backslash-newline. Following GCC, allow
+ white space between the backslash and the newline. */
+splice (\\[ \f\t\v]*\n)*
%%
%{
+ /* Nesting level of the current code in braces. */
+ int braces_level IF_LINT (= 0);
+
+ /* Scanner context when scanning C code. */
+ int c_context IF_LINT (= 0);
+
+ /* A string representing the most recently saved token. */
+ char *last_string;
+
/* At each yylex invocation, mark the current position as the
start of the next token. */
-#define TR_POS 0
-#if TR_POS
- fprintf (stderr, "FOO1: %p: ", yylloc);
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, "\n");
-#endif
YY_STEP;
-#if TR_POS
- fprintf (stderr, "BAR1: ");
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, "\n");
-#endif
%}
"%debug" return PERCENT_DEBUG;
"%define" return PERCENT_DEFINE;
"%defines" return PERCENT_DEFINES;
+ "%destructor" return PERCENT_DESTRUCTOR;
+ "%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;
+ "%glr-parser" return PERCENT_GLR_PARSER;
"%left" return PERCENT_LEFT;
"%locations" return PERCENT_LOCATIONS;
+ "%merge" return PERCENT_MERGE;
"%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
"%no"[-_]"lines" return PERCENT_NO_LINES;
"%nonassoc" return PERCENT_NONASSOC;
"%nterm" return PERCENT_NTERM;
"%output" return PERCENT_OUTPUT;
- "%prec" return PERCENT_PREC;
+ "%parse-param" return PERCENT_PARSE_PARAM;
+ "%prec" rule_length--; return PERCENT_PREC;
+ "%printer" return PERCENT_PRINTER;
"%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;
"%verbose" return PERCENT_VERBOSE;
"%yacc" return PERCENT_YACC;
+ {directive} {
+ complain_at (*yylloc, _("invalid directive: %s"), quote (yytext));
+ YY_STEP;
+ }
+
+ ^"#line "{int}" \""[^\"]*"\"\n" handle_syncline (yytext + strlen ("#line "), yylloc); YY_STEP;
+
"=" return EQUAL;
- ":" return COLON;
- "|" return PIPE;
+ ":" rule_length = 0; return COLON;
+ "|" rule_length = 0; return PIPE;
+ "," return COMMA;
";" return SEMICOLON;
- {eols} YY_LINES; YY_STEP;
- {blanks} YY_STEP;
+ [ \f\n\t\v] YY_STEP;
+
{id} {
- yylval->symbol = getsym (yytext, *yylloc);
+ yylval->symbol = symbol_get (yytext, *yylloc);
+ rule_length++;
return ID;
}
- {int} yylval->integer = strtol (yytext, 0, 10); return INT;
+ {int} {
+ unsigned long num;
+ errno = 0;
+ num = strtoul (yytext, 0, 10);
+ if (INT_MAX < num || errno)
+ {
+ complain_at (*yylloc, _("integer out of range: %s"), quote (yytext));
+ num = INT_MAX;
+ }
+ yylval->integer = num;
+ return INT;
+ }
/* Characters. We don't check there is only one. */
- \' YY_OBS_GROW; yy_push_state (SC_ESCAPED_CHARACTER);
+ "'" YY_OBS_GROW; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
- \" YY_OBS_GROW; yy_push_state (SC_ESCAPED_STRING);
+ "\"" YY_OBS_GROW; BEGIN SC_ESCAPED_STRING;
/* Comments. */
- "/*" yy_push_state (SC_COMMENT);
+ "/*" BEGIN SC_YACC_COMMENT;
"//".* YY_STEP;
/* Prologue. */
- "%{" yy_push_state (SC_PROLOGUE);
+ "%{" BEGIN SC_PROLOGUE;
/* Code in between braces. */
- "{" YY_OBS_GROW; ++braces_level; yy_push_state (SC_BRACED_CODE);
+ "{" YY_OBS_GROW; braces_level = 0; BEGIN SC_BRACED_CODE;
/* A type. */
- "<"[^>]+">" {
+ "<"{tag}">" {
obstack_grow (&string_obstack, yytext + 1, yyleng - 2);
YY_OBS_FINISH;
yylval->string = last_string;
return TYPE;
}
-
- "%%" {
+ "%%" {
+ static int percent_percent_count;
if (++percent_percent_count == 2)
- yy_push_state (SC_EPILOGUE);
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
- . {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": invalid character: `%c'\n", *yytext);
+ . {
+ complain_at (*yylloc, _("invalid character: %s"), quote (yytext));
YY_STEP;
}
}
- /*------------------------------------------------------------.
- | Whatever the start condition (but those which correspond to |
- | entity `swallowed' by Bison: SC_ESCAPED_STRING and |
- | SC_ESCAPED_CHARACTER), no M4 character must escape as is. |
- `------------------------------------------------------------*/
+ /*---------------------------------------------------------------.
+ | Scanning a Yacc comment. The initial `/ *' is already eaten. |
+ `---------------------------------------------------------------*/
-<SC_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
+<SC_YACC_COMMENT>
{
- \[ if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@<:@");
- \] if (YY_START != SC_COMMENT) obstack_sgrow (&string_obstack, "@:>@");
-}
+ "*/" {
+ YY_STEP;
+ BEGIN INITIAL;
+ }
+ .|\n ;
+ <<EOF>> unexpected_end_of_file (yylloc, "*/");
+}
- /*-----------------------------------------------------------.
- | Scanning a C comment. The initial `/ *' is already eaten. |
- `-----------------------------------------------------------*/
+ /*------------------------------------------------------------.
+ | Scanning a C comment. The initial `/ *' is already eaten. |
+ `------------------------------------------------------------*/
<SC_COMMENT>
{
- "*/" { /* End of the comment. */
- if (yy_top_state () == INITIAL)
- {
- YY_STEP;
- }
- else
- {
- YY_OBS_GROW;
- }
- yy_pop_state ();
- }
+ "*"{splice}"/" YY_OBS_GROW; BEGIN c_context;
+ <<EOF>> unexpected_end_of_file (yylloc, "*/");
+}
- [^\[\]*\n\r]+ if (yy_top_state () != INITIAL) YY_OBS_GROW;
- {eols} if (yy_top_state () != INITIAL) YY_OBS_GROW; YY_LINES;
- . /* Stray `*'. */if (yy_top_state () != INITIAL) YY_OBS_GROW;
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a comment\n");
- yy_pop_state ();
- }
+ /*--------------------------------------------------------------.
+ | Scanning a line comment. The initial `//' is already eaten. |
+ `--------------------------------------------------------------*/
+
+<SC_LINE_COMMENT>
+{
+ "\n" YY_OBS_GROW; BEGIN c_context;
+ {splice} YY_OBS_GROW;
+ <<EOF>> BEGIN c_context;
}
<SC_ESCAPED_STRING>
{
- \" {
- assert (yy_top_state () == INITIAL);
+ "\"" {
YY_OBS_GROW;
YY_OBS_FINISH;
yylval->string = last_string;
- yy_pop_state ();
+ rule_length++;
+ BEGIN INITIAL;
return STRING;
}
- [^\"\n\r\\]+ YY_OBS_GROW;
-
- {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a string\n");
- assert (yy_top_state () == INITIAL);
- YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return STRING;
- }
+ .|\n YY_OBS_GROW;
+ <<EOF>> unexpected_end_of_file (yylloc, "\"");
}
/*---------------------------------------------------------------.
<SC_ESCAPED_CHARACTER>
{
- \' {
+ "'" {
YY_OBS_GROW;
- assert (yy_top_state () == INITIAL);
- {
- YY_OBS_FINISH;
- yylval->symbol = getsym (last_string, *yylloc);
- symbol_class_set (yylval->symbol, token_sym);
- symbol_user_token_number_set (yylval->symbol, last_string[1]);
- YY_OBS_FREE;
- yy_pop_state ();
- return ID;
- }
- }
-
- [^\'\n\r\\] YY_OBS_GROW;
-
- {eols} obstack_1grow (&string_obstack, '\n'); YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a character\n");
- assert (yy_top_state () == INITIAL);
YY_OBS_FINISH;
- yylval->string = last_string;
- yy_pop_state ();
- return CHARACTER;
+ 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;
+ rule_length++;
+ BEGIN INITIAL;
+ return ID;
}
+
+ .|\n YY_OBS_GROW;
+ <<EOF>> unexpected_end_of_file (yylloc, "'");
}
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
- \\[0-7]{3} {
- long c = strtol (yytext + 1, 0, 8);
- if (c > 255)
+ \\[0-7]{1,3} {
+ unsigned long c = strtoul (yytext + 1, 0, 8);
+ if (UCHAR_MAX < c)
{
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": invalid escape: %s\n", yytext);
+ complain_at (*yylloc, _("invalid escape sequence: %s"),
+ quote (yytext));
YY_STEP;
}
else
obstack_1grow (&string_obstack, c);
}
- \\x[0-9a-fA-F]{2} {
- obstack_1grow (&string_obstack, strtol (yytext + 2, 0, 16));
+ \\x[0-9a-fA-F]+ {
+ unsigned long c;
+ errno = 0;
+ c = strtoul (yytext + 2, 0, 16);
+ if (UCHAR_MAX < c || errno)
+ {
+ complain_at (*yylloc, _("invalid escape sequence: %s"),
+ quote (yytext));
+ YY_STEP;
+ }
+ else
+ obstack_1grow (&string_obstack, c);
}
\\a obstack_1grow (&string_obstack, '\a');
\\r obstack_1grow (&string_obstack, '\r');
\\t obstack_1grow (&string_obstack, '\t');
\\v obstack_1grow (&string_obstack, '\v');
- \\[\\""] obstack_1grow (&string_obstack, yytext[1]);
- \\. {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unrecognized escape: %s\n", yytext);
+ \\[\"\'?\\] obstack_1grow (&string_obstack, yytext[1]);
+ \\(u|U[0-9a-fA-F]{4})[0-9a-fA-F]{4} {
+ int c = convert_ucn_to_byte (yytext);
+ if (c < 0)
+ {
+ complain_at (*yylloc, _("invalid escape sequence: %s"),
+ quote (yytext));
+ YY_STEP;
+ }
+ else
+ obstack_1grow (&string_obstack, c);
+ }
+ \\(.|\n) {
+ complain_at (*yylloc, _("unrecognized escape sequence: %s"),
+ quote (yytext));
YY_OBS_GROW;
}
}
<SC_CHARACTER>
{
- \' {
- YY_OBS_GROW;
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
-
- [^\[\]\'\n\r\\] YY_OBS_GROW;
- \\. YY_OBS_GROW;
-
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a character\n");
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
+ "'" YY_OBS_GROW; BEGIN c_context;
+ \\{splice}[\'\\] YY_OBS_GROW;
+ <<EOF>> unexpected_end_of_file (yylloc, "'");
}
<SC_STRING>
{
- \" {
- assert (yy_top_state () != INITIAL);
- YY_OBS_GROW;
- yy_pop_state ();
- }
-
- [^\[\]\"\n\r\\]+ YY_OBS_GROW;
- \\. YY_OBS_GROW;
-
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a string\n");
- assert (yy_top_state () != INITIAL);
- yy_pop_state ();
- }
+ "\"" YY_OBS_GROW; BEGIN c_context;
+ \\{splice}[\"\\] YY_OBS_GROW;
+ <<EOF>> unexpected_end_of_file (yylloc, "\"");
}
<SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
{
- /* Characters. We don't check there is only one. */
- \' YY_OBS_GROW; yy_push_state (SC_CHARACTER);
-
- /* Strings. */
- \" YY_OBS_GROW; yy_push_state (SC_STRING);
-
- /* Comments. */
- "/*" YY_OBS_GROW; yy_push_state (SC_COMMENT);
- "//".* YY_OBS_GROW;
+ "'" YY_OBS_GROW; c_context = YY_START; BEGIN SC_CHARACTER;
+ "\"" YY_OBS_GROW; c_context = YY_START; BEGIN SC_STRING;
+ "/"{splice}"*" YY_OBS_GROW; c_context = YY_START; BEGIN SC_COMMENT;
+ "/"{splice}"/" YY_OBS_GROW; c_context = YY_START; BEGIN SC_LINE_COMMENT;
}
<SC_BRACED_CODE>
{
+ "{"|"<"{splice}"%" YY_OBS_GROW; braces_level++;
+ "%"{splice}">" YY_OBS_GROW; braces_level--;
"}" {
YY_OBS_GROW;
- if (--braces_level == 0)
+ braces_level--;
+ if (braces_level < 0)
{
- yy_pop_state ();
YY_OBS_FINISH;
yylval->string = last_string;
+ rule_length++;
+ BEGIN INITIAL;
return BRACED_CODE;
}
}
- "{" YY_OBS_GROW; braces_level++;
+ /* Tokenize `<<%' correctly (as `<<' `%') rather than incorrrectly
+ (as `<' `<%'). */
+ "<"{splice}"<" YY_OBS_GROW;
- "$"("<"[^>]+">")?(-?[0-9]+|"$") { handle_dollar (yytext, *yylloc); }
- "@"(-?[0-9]+|"$") { handle_at (yytext); }
-
- [^$@\[\]/\'\"\{\}\n\r]+ YY_OBS_GROW;
- {eols} YY_OBS_GROW; YY_LINES;
-
- /* A lose $, or /, or etc. */
- . YY_OBS_GROW;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a braced code\n");
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return BRACED_CODE;
- }
+ "$"("<"{tag}">")?(-?[0-9]+|"$") { handle_dollar (current_braced_code,
+ yytext, *yylloc); }
+ "@"(-?[0-9]+|"$") { handle_at (current_braced_code,
+ yytext, *yylloc); }
+ <<EOF>> unexpected_end_of_file (yylloc, "}");
}
<SC_PROLOGUE>
{
"%}" {
- yy_pop_state ();
- YY_OBS_FINISH;
- yylval->string = last_string;
- return PROLOGUE;
- }
-
- [^%\[\]/\'\"\n\r]+ YY_OBS_GROW;
- "%"+[^%\}\n\r]+ YY_OBS_GROW;
- {eols} YY_OBS_GROW; YY_LINES;
-
- <<EOF>> {
- LOCATION_PRINT (stderr, *yylloc);
- fprintf (stderr, ": unexpected end of file in a prologue\n");
- yy_pop_state ();
YY_OBS_FINISH;
yylval->string = last_string;
+ BEGIN INITIAL;
return PROLOGUE;
}
+ <<EOF>> unexpected_end_of_file (yylloc, "%}");
}
/*---------------------------------------------------------------.
| Scanning the epilogue (everything after the second "%%", which |
- | has already been eaten. |
+ | has already been eaten). |
`---------------------------------------------------------------*/
<SC_EPILOGUE>
{
- ([^\[\]]|{eols})+ YY_OBS_GROW;
-
<<EOF>> {
- yy_pop_state ();
YY_OBS_FINISH;
yylval->string = 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 (&string_obstack, "$][");
+ \@ obstack_sgrow (&string_obstack, "@@");
+ \[ obstack_sgrow (&string_obstack, "@{");
+ \] obstack_sgrow (&string_obstack, "@}");
+ .|\n YY_OBS_GROW;
+}
+
+
%%
/*------------------------------------------------------------------.
-| CP is pointing to a wannabee semantic value (i.e., a `$'). |
+| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
| |
| Possible inputs: $[<TYPENAME>]($|integer) |
| |
| Output to the STRING_OBSTACK a reference to this semantic value. |
`------------------------------------------------------------------*/
-static void
-handle_dollar (char *cp, location_t location)
+static inline void
+handle_action_dollar (char *text, location_t location)
{
const char *type_name = NULL;
-
- ++cp;
+ char *cp = text + 1;
/* Get the type name if explicit. */
if (*cp == '<')
obstack_fgrow1 (&string_obstack,
"]b4_lhs_value([%s])[", type_name);
}
- else if (isdigit (*cp) || *cp == '-')
+ else
{
- /* RULE_LENGTH is the number of values in the current rule so
- far, which says where to find `$0' with respect to the top of
- the stack. It is not the same as the rule->length in the
- case of mid rule actions. */
- int rule_length = symbol_list_length (current_rule->next);
- int n = strtol (cp, &cp, 10);
-
- if (n > rule_length)
- complain_at (location, _("invalid value: %s%d"), "$", n);
- else
+ long num;
+ errno = 0;
+ num = strtol (cp, 0, 10);
+
+ if (INT_MIN <= num && num <= rule_length && ! errno)
{
+ int n = num;
if (!type_name && n > 0)
type_name = symbol_list_n_type_name_get (current_rule, location,
n);
"]b4_rhs_value([%d], [%d], [%s])[",
rule_length, n, type_name);
}
+ else
+ complain_at (location, _("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 == '$')
+ obstack_sgrow (&string_obstack, "]b4_dollar_dollar[");
else
+ complain_at (location, _("invalid value: %s"), quote (text));
+}
+
+
+/*-----------------------------------------------------------------.
+| Dispatch onto handle_action_dollar, or handle_destructor_dollar, |
+| depending upon CODE_KIND. |
+`-----------------------------------------------------------------*/
+
+static void
+handle_dollar (braced_code_t braced_code_kind,
+ char *text, location_t location)
+{
+ switch (braced_code_kind)
{
- char buf[] = "$c";
- buf[1] = *cp;
- complain (_("%s is invalid"), quote (buf));
+ case action_braced_code:
+ handle_action_dollar (text, location);
+ break;
+
+ case destructor_braced_code:
+ case printer_braced_code:
+ handle_symbol_code_dollar (text, location);
+ break;
}
}
-/*-------------------------------------------------------.
-| CP is pointing to a location (i.e., a `@'). Output to |
-| STRING_OBSTACK a reference to this location. |
-`-------------------------------------------------------*/
-static void
-handle_at (char *cp)
+/*------------------------------------------------------.
+| TEXT is a location token (i.e., a `@...'). Output to |
+| STRING_OBSTACK a reference to this location. |
+`------------------------------------------------------*/
+
+static inline void
+handle_action_at (char *text, location_t location)
{
+ char *cp = text + 1;
locations_flag = 1;
- ++cp;
if (*cp == '$')
{
obstack_sgrow (&string_obstack, "]b4_lhs_location[");
}
- else if (isdigit (*cp) || *cp == '-')
+ else
{
- /* RULE_LENGTH is the number of values in the current rule so
- far, which says where to find `$0' with respect to the top of
- the stack. It is not the same as the rule->length in the
- case of mid rule actions. */
- int rule_length = symbol_list_length (current_rule->next);
- int n = strtol (cp, &cp, 10);
-
- if (n > rule_length)
- complain (_("invalid value: %s%d"), "@", n);
+ long num;
+ errno = 0;
+ num = strtol (cp, 0, 10);
+
+ if (INT_MIN <= num && num <= rule_length && ! errno)
+ {
+ int n = num;
+ obstack_fgrow2 (&string_obstack, "]b4_rhs_location([%d], [%d])[",
+ rule_length, n);
+ }
else
- obstack_fgrow2 (&string_obstack, "]b4_rhs_location([%d], [%d])[",
- rule_length, n);
+ complain_at (location, _("integer out of range: %s"), quote (text));
}
+}
+
+
+/*---------------------------------------------------------------.
+| TEXT is expected to be @$ 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 == '$')
+ obstack_sgrow (&string_obstack, "]b4_at_dollar[");
else
+ complain_at (location, _("invalid value: %s"), quote (text));
+}
+
+
+/*-------------------------------------------------------------------.
+| Dispatch onto handle_action_at, or handle_destructor_at, depending |
+| upon CODE_KIND. |
+`-------------------------------------------------------------------*/
+
+static void
+handle_at (braced_code_t braced_code_kind,
+ char *text, location_t location)
+{
+ switch (braced_code_kind)
{
- char buf[] = "@c";
- buf[1] = *cp;
- complain (_("%s is invalid"), quote (buf));
+ case action_braced_code:
+ handle_action_at (text, location);
+ break;
+
+ case destructor_braced_code:
+ case printer_braced_code:
+ handle_symbol_code_at (text, location);
+ break;
}
}
+
+/*------------------------------------------------------------------.
+| Convert universal character name UCN to a single-byte character, |
+| and return that character. Return -1 if UCN does not correspond |
+| to a single-byte character. |
+`------------------------------------------------------------------*/
+
+static int
+convert_ucn_to_byte (char const *ucn)
+{
+ unsigned long code = strtoul (ucn + 2, 0, 16);
+
+ /* FIXME: Currently we assume Unicode-compatible unibyte characters
+ on ASCII hosts (i.e., Latin-1 on hosts with 8-bit bytes). On
+ non-ASCII hosts we support only the portable C character set.
+ These limitations should be removed once we add support for
+ multibyte characters. */
+
+ if (UCHAR_MAX < code)
+ return -1;
+
+#if ! ('$' == 0x24 && '@' == 0x40 && '`' == 0x60 && '~' == 0x7e)
+ {
+ /* 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 '$', '@',
+ and '`', which are not in the basic execution character set but
+ which are unibyte characters on all the platforms that we know
+ about. */
+ static signed char const table[] =
+ {
+ '\0', -1, -1, -1, -1, -1, -1, '\a',
+ '\b', '\t', '\n', '\v', '\f', '\r', -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ ' ', '!', '"', '#', '$', '%', '&', '\'',
+ '(', ')', '*', '+', ',', '-', '.', '/',
+ '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', ':', ';', '<', '=', '>', '?',
+ '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
+ 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+ 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
+ 'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
+ '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
+ 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+ 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
+ 'x', 'y', 'z', '{', '|', '}', '~'
+ };
+
+ code = code < sizeof table ? table[code] : -1;
+ }
+#endif
+
+ return code;
+}
+
+
+/*----------------------------------------------------------------.
+| Handle `#line INT "FILE"'. ARGS has already skipped `#line '. |
+`----------------------------------------------------------------*/
+
+static void
+handle_syncline (char *args, location_t *location)
+{
+ int lineno = strtol (args, &args, 10);
+ const char *file = NULL;
+ file = strchr (args, '"') + 1;
+ *strchr (file, '"') = 0;
+ /* FIXME: Leaking... Can't free, as some locations are still
+ pointing to the old file name. */
+ infile = xstrdup (file);
+ location->file = infile;
+ location->last_line = lineno;
+}
+
+
+/*-------------------------------------------------------------.
+| Report an unexpected end of file at LOC. 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 (location_t *loc, char const *token_end)
+{
+ size_t i = strlen (token_end);
+
+ complain_at (*loc, _("missing `%s' at end of file"), token_end);
+
+ /* Adjust location's last column so that any later message does not
+ mention the characters just inserted. */
+ loc->last_column -= i;
+
+ while (i != 0)
+ unput (token_end[--i]);
+}
+
+
+/*-------------------------.
+| Initialize the scanner. |
+`-------------------------*/
+
void
scanner_initialize (void)
{
}
+/*-----------------------------------------------.
+| Free all the memory allocated to the scanner. |
+`-----------------------------------------------*/
+
void
scanner_free (void)
{
obstack_free (&string_obstack, 0);
+ /* Reclaim Flex's buffers. */
+ yy_delete_buffer (YY_CURRENT_BUFFER);
}
projects / bison.git / blobdiff