--- /dev/null
+# -*- Autoconf -*-
+
+cat <<EOF
+
+Simple Calculator.
+
+EOF
+
+
+## ---------------------------------------------------- ##
+## Compile the grammar described in the documentation. ##
+## ---------------------------------------------------- ##
+
+
+# ------------------------- #
+# Helping Autotest macros. #
+# ------------------------- #
+
+
+# _AT_DATA_CALC_Y($1, $2, $3, [CPP-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
+# AT_DATA_CALC_Y does.
+AT_DEFINE([_AT_DATA_CALC_Y],
+[ifelse([$1$2$3],
+ $[1]$[2]$[3], [],
+ [errprint([$0: Invalid arguments: $@
+])m4exit(1)])dnl
+AT_DATA([calc.y],
+[[/* Infix notation calculator--calc */
+
+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+]$4[
+
+static int power (int base, int exponent);
+static void yyerror (const char *s);
+static int yylex (void);
+extern void perror (const char *s);
+%}
+
+/* BISON Declarations */
+%token NUM
+
+%nonassoc '=' /* comparison */
+%left '-' '+'
+%left '*' '/'
+%left NEG /* negation--unary minus */
+%right '^' /* exponentiation */
+
+/* Grammar follows */
+%%
+input:
+ /* empty string */
+| input line
+;
+
+line:
+ '\n'
+| exp '\n'
+;
+
+exp:
+ NUM { $$ = $1; }
+| exp '=' exp
+ {
+ if ($1 != $3)
+ printf ("calc: error: %d != %d\n", $1, $3);
+ $$ = $1 == $3;
+ }
+| exp '+' exp { $$ = $1 + $3; }
+| exp '-' exp { $$ = $1 - $3; }
+| exp '*' exp { $$ = $1 * $3; }
+| exp '/' exp { $$ = $1 / $3; }
+| '-' exp %prec NEG { $$ = -$2; }
+| exp '^' exp { $$ = power ($1, $3); }
+| '(' exp ')' { $$ = $2; }
+;
+%%
+/* The input. */
+FILE *yyin;
+
+static void
+yyerror (const char *s)
+{
+#ifdef YYLSP_NEEDED
+ fprintf (stderr, "%d.%d:%d.%d: ",
+ yylloc.first_line, yylloc.first_column,
+ yylloc.last_line, yylloc.last_column);
+#endif
+ fprintf (stderr, "%s\n", s);
+}
+
+static int
+yygetc ()
+{
+ int res = getc (yyin);
+#ifdef YYLSP_NEEDED
+ if (res == '\n')
+ {
+ yylloc.last_line++;
+ yylloc.last_column = 0;
+ }
+ else
+ yylloc.last_column++;
+#endif
+ return res;
+}
+
+
+static void
+yyungetc (int c)
+{
+#ifdef YYLSP_NEEDED
+ /* Wrong when C == `\n'. */
+ yylloc.last_column--;
+#endif
+ ungetc (c, yyin);
+}
+
+static int
+read_signed_integer (void)
+{
+ int c = yygetc ();
+ int sign = 1;
+ int n = 0;
+
+ if (c == '-')
+ {
+ c = yygetc ();
+ sign = -1;
+ }
+
+ while (isdigit (c))
+ {
+ n = 10 * n + (c - '0');
+ c = yygetc ();
+ }
+
+ yyungetc (c);
+
+ return sign * n;
+}
+
+
+
+/*---------------------------------------------------------------.
+| Lexical analyzer returns an integer on the stack and the token |
+| NUM, or the ASCII character read if not a number. Skips all |
+| blanks and tabs, returns 0 for EOF. |
+`---------------------------------------------------------------*/
+
+static int
+yylex (void)
+{
+ int c;
+
+#ifdef YYLSP_NEEDED
+ yylloc.first_column = yylloc.last_column;
+ yylloc.first_line = yylloc.last_line;
+#endif
+
+ /* Skip white space. */
+ while ((c = yygetc ()) == ' ' || c == '\t')
+ {
+#ifdef YYLSP_NEEDED
+ yylloc.first_column = yylloc.last_column;
+ yylloc.first_line = yylloc.last_line;
+#endif
+ }
+
+ /* process numbers */
+ if (c == '.' || isdigit (c))
+ {
+ yyungetc (c);
+ yylval = read_signed_integer ();
+ return NUM;
+ }
+
+ /* Return end-of-file. */
+ if (c == EOF)
+ return 0;
+
+ /* Return single chars. */
+ return c;
+}
+
+static int
+power (int base, int exponent)
+{
+ int res = 1;
+ if (exponent < 0)
+ exit (1);
+ for (/* Niente */; exponent; --exponent)
+ res *= base;
+ return res;
+}
+
+int
+main (int argn, const char **argv)
+{
+ if (argn == 2)
+ yyin = fopen (argv[1], "r");
+ else
+ yyin = stdin;
+
+ if (!stdin)
+ {
+ perror (argv[1]);
+ exit (1);
+ }
+
+#if YYDEBUG
+ yydebug = 1;
+#endif
+#ifdef YYLSP_NEEDED
+ yylloc.last_column = 0;
+ yylloc.last_line = 1;
+#endif
+ yyparse ();
+ return 0;
+}
+]])
+])# _AT_DATA_CALC_Y
+
+
+# AT_DATA_CALC_Y([BISON-OPTIONS])
+# -------------------------------
+# Produce `calc.y'.
+AT_DEFINE([AT_DATA_CALC_Y],
+[_AT_DATA_CALC_Y($[1], $[2], $[3],
+ [ifelse(regexp([$1], [--yyerror-verbose]),
+ [-1], [],
+ [[#define YYERROR_VERBOSE]])])])
+
+
+
+# _AT_CHECK_CALC(BISON-OPTIONS, INPUT)
+# ------------------------------------
+# Run `calc' on INPUT and expect no STDOUT nor STDERR.
+# If `--debug' is passed to bison, discard all the debugging traces
+# preserving only the `parse errors'. Note that since there should be
+# none, the `grep' will fail with exit status 1.
+AT_DEFINE([_AT_CHECK_CALC],
+[ifelse(regexp([$1], [--debug]),
+ [-1],
+ [AT_CHECK([echo "$2" | calc],
+ [0], [], [])],
+ [AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2],
+ [1], [], [])])])
+
+
+# _AT_CHECK_CALC_ERROR(BISON-OPTIONS, INPUT,
+# [ERROR-LOCATION], [IF-YYERROR-VERBOSE])
+# ------------------------------------------------------------
+# Run `calc' on INPUT, and expect STDERR.
+AT_DEFINE([_AT_CHECK_CALC_ERROR],
+[AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2], 0,
+ [],
+[ifelse(regexp([$1], [--location]),
+ [-1], [], [$3: ])[]dnl
+parse error[]dnl
+ifelse(regexp([$1], [--yyerror-verbose]),
+ [-1], [], [$4])[]dnl
+
+])])
+
+
+# AT_CHECK_CALC([BISON-OPTIONS], [PARSER-EXPECTED-STDERR])
+# --------------------------------------------------------
+# Start a testing chunk which compiles `calc' grammar with
+# BISON-OPTIONS, and performs several tests over the parser.
+AT_DEFINE([AT_CHECK_CALC],
+[# We use integers to avoid dependencies upon the precision of doubles.
+AT_SETUP([Calculator $1])
+
+AT_DATA_CALC_Y([$1])
+
+# Specify the output files to avoid problems on different file systems.
+AT_CHECK([bison calc.y -o calc.c patsubst([$1], [--yyerror-verbose])],
+ [0], [], [])
+AT_CHECK([$CC $CFLAGS calc.c -o calc], 0, [], [])
+
+# Test the priorities.
+_AT_CHECK_CALC([$1],
+[1 + 2 * 3 = 7
+1 + 2 * -3 = -5
+
+-1^2 = -1
+(-1)^2 = 1
+
+---1 = -1
+
+1 - 2 - 3 = -4
+1 - (2 - 3) = 2
+
+2^2^3 = 256
+(2^2)^3 = 64], [$2])
+
+# Some parse errors.
+_AT_CHECK_CALC_ERROR([$1], [+1],
+ [1.0:1.1],
+ [, unexpected `'+''])
+_AT_CHECK_CALC_ERROR([$1], [1//2],
+ [1.2:1.3],
+ [, unexpected `'/'', expecting `NUM' or `'-'' or `'(''])
+_AT_CHECK_CALC_ERROR([$1], [error],
+ [1.0:1.1],
+ [, unexpected `$undefined.'])
+_AT_CHECK_CALC_ERROR([$1], [1 = 2 = 3],
+ [1.6:1.7],
+ [, unexpected `'=''])
+_AT_CHECK_CALC_ERROR([$1],
+ [
++1],
+ [2.0:2.1],
+ [, unexpected `'+''])
+
+AT_CLEANUP(calc calc.c calc.h calc.output)
+])# AT_CHECK_CALC
+
+
+
+
+# ------------------ #
+# Test the parsers. #
+# ------------------ #
+
+AT_CHECK_CALC()
+# This one is very suspicious. The test fails, but it might be normal.
+AT_CHECK_CALC([--raw])
+
+AT_CHECK_CALC([--defines])
+AT_CHECK_CALC([--locations])
+AT_CHECK_CALC([--name-prefix=calc])
+AT_CHECK_CALC([--verbose])
+AT_CHECK_CALC([--yacc])
+AT_CHECK_CALC([--yyerror-verbose])
+
+AT_CHECK_CALC([--locations --yyerror-verbose])
+
+AT_CHECK_CALC([--defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])
+
+AT_CHECK_CALC([--debug])
+AT_CHECK_CALC([--debug --defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])
projects / bison.git / commitdiff
