# ------------------------- #
-# _AT_DATA_CALC_Y($1, $2, $3, [CPP-DIRECTIVES])
-# ---------------------------------------------
+# _AT_DATA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
+# -----------------------------------------------
# Produce `calc.y'. Don't call this macro directly, because it contains
# some occurrences of `$1' etc. which will be interpreted by m4. So
# you should call it with $1, $2, and $3 as arguments, which is what
[m4_fatal([$0: Invalid arguments: $@])])dnl
AT_DATA([calc.y],
[[/* Infix notation calculator--calc */
-
+]$4[
%{
#include <config.h>
/* We don't need perfect functions for these tests. */
#if STDC_HEADERS
# include <stdlib.h>
# include <string.h>
-#else
-char *strcat(char *dest, const char *src);
#endif
#include <ctype.h>
-
-static int power (int base, int exponent);
-static void yyerror (const char *s);
-static int yylex (void);
-static int yygetc (void);
-static void yyungetc (int c);
+#include <assert.h>
extern void perror (const char *s);
/* Exercise pre-prologue dependency to %union. */
typedef int value_t;
+value_t global_result = 0;
+int global_count = 0;
+
%}
/* Exercise %union. */
value_t ival;
};
+%{
+#if YYPURE
+# define LOC (*yylloc)
+# define VAL (*yylval)
+#else
+# define LOC (yylloc)
+# define VAL (yylval)
+#endif
+
+#define YYLLOC_FORMAL ]AT_LOCATION_IF([, YYLTYPE *yylloc])[
+#define YYLLOC_ARG ]AT_LOCATION_IF([, yylloc])[
+#define USE_YYLLOC ]AT_LOCATION_IF([(void) yylloc;])[
+
+#if YYPURE
+# define LEX_FORMALS YYSTYPE *yylval YYLLOC_FORMAL
+# define LEX_ARGS yylval YYLLOC_ARG
+# define USE_LEX_ARGS (void) yylval; USE_YYLLOC
+# define LEX_PRE_FORMALS LEX_FORMALS,
+# define LEX_PRE_ARGS LEX_ARGS,
+#else
+# define LEX_FORMALS void
+# define LEX_PRE_FORMALS
+# define LEX_ARGS
+# define LEX_PRE_ARGS
+# define USE_LEX_ARGS
+#endif
+
+static int power (int base, int exponent);
+/* yyerror receives the location if:
+ - %location & %pure & %glr
+ - %location & %pure & %yacc & %parse-param. */
+static void yyerror (]AT_YYERROR_ARG_LOC_IF([YYLTYPE *yylloc, ])[
+ ]AT_PARAM_IF([value_t *result, int *count, ])[
+ const char *s
+ );
+static int yylex (LEX_FORMALS);
+static int yygetc (LEX_FORMALS);
+static void yyungetc (LEX_PRE_FORMALS int c);
+%}
+
/* Bison Declarations */
-%token CALC_EOF 0 "end of file"
+%token CALC_EOF 0 "end of input"
%token <ival> NUM "number"
%type <ival> exp
%left NEG /* negation--unary minus */
%right '^' /* exponentiation */
-]$4[
-
/* Grammar follows */
%%
input:
line
-| input line
+| input line { ]AT_PARAM_IF([++*count; ++global_count;])[ }
;
line:
- '\n' {}
-| exp '\n' {}
+ '\n'
+| exp '\n' { ]AT_PARAM_IF([*result = global_result = $1;])[ }
;
exp:
NUM { $$ = $1; }
| exp '=' exp
{
- if ($1 != $3)
- fprintf (stderr, "calc: error: %d != %d\n", $1, $3);
- $$ = $1 == $3;
+ if ($1 != $3)
+ fprintf (stderr, "calc: error: %d != %d\n", $1, $3);
+ $$ = $1;
}
| exp '+' exp { $$ = $1 + $3; }
| exp '-' exp { $$ = $1 - $3; }
FILE *yyin;
static void
-yyerror (const char *s)
+yyerror (]AT_YYERROR_ARG_LOC_IF([YYLTYPE *yylloc, ])[
+ ]AT_PARAM_IF([value_t *result, int *count, ])[
+ const char *s
+ )
{
-#if YYLSP_NEEDED
+]AT_PARAM_IF([(void) result; (void) count; ])[
+]AT_YYERROR_SEES_LOC_IF([
fprintf (stderr, "%d.%d-%d.%d: ",
- yylloc.first_line, yylloc.first_column,
- yylloc.last_line, yylloc.last_column);
-#endif
+ LOC.first_line, LOC.first_column,
+ LOC.last_line, LOC.last_column);
+])[
fprintf (stderr, "%s\n", s);
}
-#if YYLSP_NEEDED
+]AT_LOCATION_IF([
static YYLTYPE last_yylloc;
-#endif
+])[
static int
-yygetc (void)
+yygetc (LEX_FORMALS)
{
int res = getc (yyin);
-#if YYLSP_NEEDED
- last_yylloc = yylloc;
+ USE_LEX_ARGS;
+]AT_LOCATION_IF([
+ last_yylloc = LOC;
if (res == '\n')
{
- yylloc.last_line++;
- yylloc.last_column = 1;
+ LOC.last_line++;
+ LOC.last_column = 1;
}
else
- yylloc.last_column++;
-#endif
+ LOC.last_column++;
+])[
return res;
}
static void
-yyungetc (int c)
+yyungetc (LEX_PRE_FORMALS int c)
{
-#if YYLSP_NEEDED
+ USE_LEX_ARGS;
+]AT_LOCATION_IF([
/* Wrong when C == `\n'. */
- yylloc = last_yylloc;
-#endif
+ LOC = last_yylloc;
+])[
ungetc (c, yyin);
}
static int
-read_signed_integer (void)
+read_signed_integer (LEX_FORMALS)
{
- int c = yygetc ();
+ int c = yygetc (LEX_ARGS);
int sign = 1;
int n = 0;
+ USE_LEX_ARGS;
if (c == '-')
{
- c = yygetc ();
+ c = yygetc (LEX_ARGS);
sign = -1;
}
while (isdigit (c))
{
n = 10 * n + (c - '0');
- c = yygetc ();
+ c = yygetc (LEX_ARGS);
}
- yyungetc (c);
+ yyungetc (LEX_PRE_ARGS c);
return sign * n;
}
`---------------------------------------------------------------*/
static int
-yylex (void)
+yylex (LEX_FORMALS)
{
+ static int init = 1;
int c;
-#if YYLSP_NEEDED
- yylloc.first_column = yylloc.last_column;
- yylloc.first_line = yylloc.last_line;
-#endif
+ if (init)
+ {
+ init = 0;
+]AT_LOCATION_IF([
+ LOC.last_column = 1;
+ LOC.last_line = 1;
+])[
+ }
+
+]AT_LOCATION_IF([
+ LOC.first_column = LOC.last_column;
+ LOC.first_line = LOC.last_line;
+])[
/* Skip white space. */
- while ((c = yygetc ()) == ' ' || c == '\t')
+ while ((c = yygetc (LEX_ARGS)) == ' ' || c == '\t')
{
-#if YYLSP_NEEDED
- yylloc.first_column = yylloc.last_column;
- yylloc.first_line = yylloc.last_line;
-#endif
+]AT_LOCATION_IF([
+ LOC.first_column = LOC.last_column;
+ LOC.first_line = LOC.last_line;
+])[
}
/* process numbers */
if (c == '.' || isdigit (c))
{
- yyungetc (c);
- yylval.ival = read_signed_integer ();
+ yyungetc (LEX_PRE_ARGS c);
+ VAL.ival = read_signed_integer (LEX_ARGS);
return NUM;
}
int
main (int argc, const char **argv)
{
+ value_t result = 0;
+ int count = 0;
yyin = NULL;
if (argc == 2)
#if YYDEBUG
yydebug = 1;
#endif
-#if YYLSP_NEEDED
- yylloc.last_column = 1;
- yylloc.last_line = 1;
-#endif
- yyparse ();
+ yyparse (]AT_PARAM_IF([&result, &count])[);
+ assert (global_result == result);
+ assert (global_count == count);
+
return 0;
}
]])
# -------------------------------
# Produce `calc.y'.
m4_define([AT_DATA_CALC_Y],
-[_AT_DATA_CALC_Y($[1], $[2], $[3],
- [m4_bpatsubst([$1], [--[^ ]*])])
+[_AT_DATA_CALC_Y($[1], $[2], $[3], [$1])
])
# _AT_CHECK_CALC_ERROR(BISON-OPTIONS, INPUT, [NUM-DEBUG-LINES],
-# [ERROR-LOCATION], [IF-YYERROR-VERBOSE])
-# ------------------------------------------------------------
+# [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
+# -------------------------------------------------------------
# Run `calc' on INPUT, and expect a `parse error' message.
#
# If INPUT starts with a slash, it is used as absolute input file name,
# otherwise as contents.
#
-# If BISON-OPTIONS contains `--location', then make sure the ERROR-LOCATION
+# If BISON-OPTIONS contains `%location', then make sure the ERROR-LOCATION
# is correctly output on stderr.
#
# If BISON-OPTIONS contains `%error-verbose', then make sure the
[$4
])
# 3. If locations are not used, remove them.
-m4_bmatch([$1], [%locations], [],
+AT_YYERROR_SEES_LOC_IF([],
[[sed 's/^[-0-9.]*: //' expout >at-expout
mv at-expout expout]])
# 4. If error-verbose is not used, strip the`, unexpected....' part.
])
+# AT_CALC_PUSHDEFS($1, $2, [BISON-OPTIONS])
+# -----------------------------------------
+# This macro works around the impossibility to define macros
+# inside macros, because issuing `[$1]' is not possible in M4 :(.
+# This sucks hard, GNU M4 should really provide M5 like $$1.
+m4_define([AT_CHECK_PUSHDEFS],
+[m4_if([$1$2], $[1]$[2], [],
+ [m4_fatal([$0: Invalid arguments: $@])])dnl
+m4_pushdef([AT_PARAM_IF],
+[m4_bmatch([$3], [%parse-param], [$1], [$2])])
+m4_pushdef([AT_LOCATION_IF],
+[m4_bmatch([$3], [%locations], [$1], [$2])])
+m4_pushdef([AT_PURE_IF],
+[m4_bmatch([$3], [%pure-parser], [$1], [$2])])
+m4_pushdef([AT_GLR_IF],
+[m4_bmatch([$3], [%glr-parser], [$1], [$2])])
+m4_pushdef([AT_PURE_AND_LOC_IF],
+[m4_bmatch([$3], [%locations.*%pure-parser\|%pure-parser.*%locations],
+ [$1], [$2])])
+m4_pushdef([AT_GLR_OR_PARAM_IF],
+[m4_bmatch([$3], [%glr-parser\|%parse-param], [$1], [$2])])
+
+# yyerror receives the location if %location & %pure & (%glr or %parse-param).
+m4_pushdef([AT_YYERROR_ARG_LOC_IF],
+[AT_GLR_OR_PARAM_IF([AT_PURE_AND_LOC_IF([$1], [$2])],
+ [$2])])
+# yyerror cannot see the locations if !glr & pure & !param.
+m4_pushdef([AT_YYERROR_SEES_LOC_IF],
+[AT_LOCATION_IF([AT_GLR_IF([$1],
+ [AT_PURE_IF([AT_PARAM_IF([$1], [$2])],
+ [$1])])],
+ [$2])])
+])
+
+
+# AT_CALC_POPDEFS
+# ---------------
+m4_define([AT_CHECK_POPDEFS],
+[m4_popdef([AT_YYERROR_SEES_LOC_IF])
+m4_popdef([AT_YYERROR_ARG_LOC_IF])
+m4_popdef([AT_GLR_OR_PARAM_IF])
+m4_popdef([AT_PURE_AND_LOC_IF])
+m4_popdef([AT_GLR_IF])
+m4_popdef([AT_LOCATION_IF])
+m4_popdef([AT_PARAM_IF])
+])
+
+
+
# AT_CHECK_CALC([BISON-OPTIONS])
# ------------------------------
# Start a testing chunk which compiles `calc' grammar with
[# We use integers to avoid dependencies upon the precision of doubles.
AT_SETUP([Calculator $1])
+AT_CHECK_PUSHDEFS($[1], $[2], [$1])
+
AT_DATA_CALC_Y([$1])
# Specify the output files to avoid problems on different file systems.
-AT_CHECK([bison -o calc.c m4_bpatsubst([$1], [%[^ ]*]) calc.y],
+AT_CHECK([bison -o calc.c calc.y],
[0], [], [])
AT_COMPILE([calc])
1 - (2 - 3) = 2
2^2^3 = 256
-(2^2)^3 = 64], [486])
+(2^2)^3 = 64],
+ [486])
# Some parse errors.
_AT_CHECK_CALC_ERROR([$1], [0 0], [11],
[2.1-2.2: parse error, unexpected '+'])
# Exercise error messages with EOF: work on an empty file.
_AT_CHECK_CALC_ERROR([$1], [/dev/null], [4],
- [1.1-1.2: parse error, unexpected "end of file", expecting "number" or '-' or '\n' or '('])
+ [1.1-1.2: parse error, unexpected "end of input", expecting "number" or '-' or '\n' or '('])
# Exercise the error token: without it, we die at the first error,
# hence be sure i. to have several errors, ii. to test the action
1.15-1.16: parse error, unexpected "number"
calc: error: 0 != 1])
-# Add a studid example demonstrating that Bison can further improve the
-# error message. FIXME: Fix this ridiculous message.
-_AT_CHECK_CALC_ERROR([$1], [()], [21],
-[1.2-1.3: parse error, unexpected ')', expecting "number" or '-' or '('])
+AT_CHECK_POPDEFS
AT_CLEANUP
])# AT_CHECK_CALC
AT_CHECK_CALC_LALR()
-AT_CHECK_CALC_LALR([--defines])
+AT_CHECK_CALC_LALR([%defines])
AT_CHECK_CALC_LALR([%locations])
-AT_CHECK_CALC_LALR([--name-prefix=calc])
-AT_CHECK_CALC_LALR([--verbose])
-AT_CHECK_CALC_LALR([--yacc])
+AT_CHECK_CALC_LALR([%name-prefix="calc"])
+AT_CHECK_CALC_LALR([%verbose])
+AT_CHECK_CALC_LALR([%yacc])
AT_CHECK_CALC_LALR([%error-verbose])
AT_CHECK_CALC_LALR([%error-verbose %locations])
-AT_CHECK_CALC_LALR([%error-verbose --defines %locations --name-prefix=calc --verbose --yacc])
+AT_CHECK_CALC_LALR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
AT_CHECK_CALC_LALR([%debug])
-AT_CHECK_CALC_LALR([%error-verbose %debug --defines %locations --name-prefix=calc --verbose --yacc])
+AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
+
+AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
+
+AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param "value_t *result", "result" %parse-param "int *count", "count"])
# ----------------------- #
AT_CHECK_CALC_GLR()
-AT_CHECK_CALC_GLR([--defines])
+AT_CHECK_CALC_GLR([%defines])
AT_CHECK_CALC_GLR([%locations])
-AT_CHECK_CALC_GLR([--name-prefix=calc])
-AT_CHECK_CALC_GLR([--verbose])
-AT_CHECK_CALC_GLR([--yacc])
+AT_CHECK_CALC_GLR([%name-prefix="calc"])
+AT_CHECK_CALC_GLR([%verbose])
+AT_CHECK_CALC_GLR([%yacc])
AT_CHECK_CALC_GLR([%error-verbose])
AT_CHECK_CALC_GLR([%error-verbose %locations])
-AT_CHECK_CALC_GLR([%error-verbose --defines %locations --name-prefix=calc --verbose --yacc])
+AT_CHECK_CALC_GLR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
AT_CHECK_CALC_GLR([%debug])
-AT_CHECK_CALC_GLR([%error-verbose %debug --defines %locations --name-prefix=calc --verbose --yacc])
+AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
+
+AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
+
+AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param "value_t *result", "result" %parse-param "int *count", "count"])
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