mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
350 lines
7.5 KiB
Plaintext
350 lines
7.5 KiB
Plaintext
# -*- Autoconf -*-
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cat <<EOF
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Simple Calculator.
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EOF
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## ---------------------------------------------------- ##
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## Compile the grammar described in the documentation. ##
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## ---------------------------------------------------- ##
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# ------------------------- #
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# Helping Autotest macros. #
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# ------------------------- #
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# _AT_DATA_CALC_Y($1, $2, $3, [CPP-DIRECTIVES])
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# ---------------------------------------------
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# Produce `calc.y'. Don't call this macro directly, because it contains
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# some occurrences of `$1' etc. which will be interpreted by m4. So
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# you should call it with $1, $2, and $3 as arguments, which is what
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# AT_DATA_CALC_Y does.
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AT_DEFINE([_AT_DATA_CALC_Y],
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[ifelse([$1$2$3],
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$[1]$[2]$[3], [],
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[errprint([$0: Invalid arguments: $@
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])m4exit(1)])dnl
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AT_DATA([calc.y],
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[[/* Infix notation calculator--calc */
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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]$4[
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static int power (int base, int exponent);
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static void yyerror (const char *s);
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static int yylex (void);
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extern void perror (const char *s);
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%}
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/* BISON Declarations */
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%token NUM
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%nonassoc '=' /* comparison */
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%left '-' '+'
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%left '*' '/'
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%left NEG /* negation--unary minus */
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%right '^' /* exponentiation */
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/* Grammar follows */
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%%
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input:
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/* empty string */
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| input line
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;
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line:
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'\n'
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| exp '\n'
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;
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exp:
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NUM { $$ = $1; }
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| exp '=' exp
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{
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if ($1 != $3)
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printf ("calc: error: %d != %d\n", $1, $3);
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$$ = $1 == $3;
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}
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| exp '+' exp { $$ = $1 + $3; }
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| exp '-' exp { $$ = $1 - $3; }
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| exp '*' exp { $$ = $1 * $3; }
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| exp '/' exp { $$ = $1 / $3; }
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| '-' exp %prec NEG { $$ = -$2; }
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| exp '^' exp { $$ = power ($1, $3); }
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| '(' exp ')' { $$ = $2; }
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;
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%%
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/* The input. */
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FILE *yyin;
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static void
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yyerror (const char *s)
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{
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#ifdef YYLSP_NEEDED
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fprintf (stderr, "%d.%d:%d.%d: ",
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yylloc.first_line, yylloc.first_column,
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yylloc.last_line, yylloc.last_column);
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#endif
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fprintf (stderr, "%s\n", s);
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}
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static int
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yygetc ()
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{
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int res = getc (yyin);
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#ifdef YYLSP_NEEDED
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if (res == '\n')
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{
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yylloc.last_line++;
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yylloc.last_column = 0;
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}
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else
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yylloc.last_column++;
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#endif
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return res;
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}
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static void
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yyungetc (int c)
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{
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#ifdef YYLSP_NEEDED
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/* Wrong when C == `\n'. */
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yylloc.last_column--;
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#endif
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ungetc (c, yyin);
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}
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static int
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read_signed_integer (void)
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{
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int c = yygetc ();
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int sign = 1;
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int n = 0;
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if (c == '-')
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{
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c = yygetc ();
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sign = -1;
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}
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while (isdigit (c))
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{
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n = 10 * n + (c - '0');
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c = yygetc ();
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}
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yyungetc (c);
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return sign * n;
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}
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/*---------------------------------------------------------------.
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| Lexical analyzer returns an integer on the stack and the token |
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| NUM, or the ASCII character read if not a number. Skips all |
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| blanks and tabs, returns 0 for EOF. |
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`---------------------------------------------------------------*/
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static int
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yylex (void)
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{
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int c;
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#ifdef YYLSP_NEEDED
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yylloc.first_column = yylloc.last_column;
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yylloc.first_line = yylloc.last_line;
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#endif
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/* Skip white space. */
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while ((c = yygetc ()) == ' ' || c == '\t')
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{
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#ifdef YYLSP_NEEDED
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yylloc.first_column = yylloc.last_column;
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yylloc.first_line = yylloc.last_line;
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#endif
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}
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/* process numbers */
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if (c == '.' || isdigit (c))
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{
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yyungetc (c);
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yylval = read_signed_integer ();
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return NUM;
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}
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/* Return end-of-file. */
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if (c == EOF)
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return 0;
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/* Return single chars. */
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return c;
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}
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static int
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power (int base, int exponent)
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{
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int res = 1;
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if (exponent < 0)
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exit (1);
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for (/* Niente */; exponent; --exponent)
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res *= base;
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return res;
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}
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int
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main (int argn, const char **argv)
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{
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if (argn == 2)
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yyin = fopen (argv[1], "r");
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else
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yyin = stdin;
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if (!stdin)
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{
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perror (argv[1]);
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exit (1);
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}
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#if YYDEBUG
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yydebug = 1;
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#endif
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#ifdef YYLSP_NEEDED
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yylloc.last_column = 0;
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yylloc.last_line = 1;
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#endif
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yyparse ();
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return 0;
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}
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]])
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])# _AT_DATA_CALC_Y
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# AT_DATA_CALC_Y([BISON-OPTIONS])
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# -------------------------------
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# Produce `calc.y'.
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AT_DEFINE([AT_DATA_CALC_Y],
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[_AT_DATA_CALC_Y($[1], $[2], $[3],
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[ifelse(regexp([$1], [--yyerror-verbose]),
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[-1], [],
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[[#define YYERROR_VERBOSE]])])])
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# _AT_CHECK_CALC(BISON-OPTIONS, INPUT)
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# ------------------------------------
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# Run `calc' on INPUT and expect no STDOUT nor STDERR.
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# If `--debug' is passed to bison, discard all the debugging traces
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# preserving only the `parse errors'. Note that since there should be
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# none, the `grep' will fail with exit status 1.
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AT_DEFINE([_AT_CHECK_CALC],
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[ifelse(regexp([$1], [--debug]),
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[-1],
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[AT_CHECK([echo "$2" | calc],
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[0], [], [])],
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[AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2],
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[1], [], [])])])
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# _AT_CHECK_CALC_ERROR(BISON-OPTIONS, INPUT,
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# [ERROR-LOCATION], [IF-YYERROR-VERBOSE])
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# ------------------------------------------------------------
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# Run `calc' on INPUT, and expect STDERR.
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AT_DEFINE([_AT_CHECK_CALC_ERROR],
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[AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2], 0,
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[],
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[ifelse(regexp([$1], [--location]),
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[-1], [], [$3: ])[]dnl
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parse error[]dnl
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ifelse(regexp([$1], [--yyerror-verbose]),
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[-1], [], [$4])[]dnl
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])])
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# AT_CHECK_CALC([BISON-OPTIONS], [PARSER-EXPECTED-STDERR])
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# --------------------------------------------------------
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# Start a testing chunk which compiles `calc' grammar with
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# BISON-OPTIONS, and performs several tests over the parser.
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AT_DEFINE([AT_CHECK_CALC],
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[# We use integers to avoid dependencies upon the precision of doubles.
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AT_SETUP([Calculator $1])
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AT_DATA_CALC_Y([$1])
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# Specify the output files to avoid problems on different file systems.
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AT_CHECK([bison calc.y -o calc.c patsubst([$1], [--yyerror-verbose])],
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[0], [], [])
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AT_CHECK([$CC $CFLAGS calc.c -o calc], 0, [], [])
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# Test the priorities.
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_AT_CHECK_CALC([$1],
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[1 + 2 * 3 = 7
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1 + 2 * -3 = -5
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-1^2 = -1
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(-1)^2 = 1
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---1 = -1
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1 - 2 - 3 = -4
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1 - (2 - 3) = 2
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2^2^3 = 256
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(2^2)^3 = 64], [$2])
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# Some parse errors.
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_AT_CHECK_CALC_ERROR([$1], [+1],
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[1.0:1.1],
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[, unexpected `'+''])
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_AT_CHECK_CALC_ERROR([$1], [1//2],
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[1.2:1.3],
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[, unexpected `'/'', expecting `NUM' or `'-'' or `'(''])
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_AT_CHECK_CALC_ERROR([$1], [error],
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[1.0:1.1],
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[, unexpected `$undefined.'])
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_AT_CHECK_CALC_ERROR([$1], [1 = 2 = 3],
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[1.6:1.7],
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[, unexpected `'=''])
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_AT_CHECK_CALC_ERROR([$1],
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[
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+1],
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[2.0:2.1],
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[, unexpected `'+''])
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AT_CLEANUP(calc calc.c calc.h calc.output)
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])# AT_CHECK_CALC
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# ------------------ #
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# Test the parsers. #
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# ------------------ #
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AT_CHECK_CALC()
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# This one is very suspicious. The test fails, but it might be normal.
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AT_CHECK_CALC([--raw])
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AT_CHECK_CALC([--defines])
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AT_CHECK_CALC([--locations])
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AT_CHECK_CALC([--name-prefix=calc])
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AT_CHECK_CALC([--verbose])
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AT_CHECK_CALC([--yacc])
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AT_CHECK_CALC([--yyerror-verbose])
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AT_CHECK_CALC([--locations --yyerror-verbose])
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AT_CHECK_CALC([--defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])
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AT_CHECK_CALC([--debug])
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AT_CHECK_CALC([--debug --defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])
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