157 lines
3 KiB
Text
157 lines
3 KiB
Text
%{
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#include "string.h"
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#include "expr.h"
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#ifndef __EXTERN_C__
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#define __EXTERN_C__ 1
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#endif
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#if defined(__cplusplus) || defined(__STDC__)
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#if defined(__cplusplus) && defined(__EXTERN_C__)
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extern "C" {
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#endif
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#endif
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int yylex(void);
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int yylook(void);
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int yywrap(void);
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int yyback(int *, int);
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void yyerror(char *);
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/* You may need to put /DLEX_SCANNER in your makefile
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* if you're using LEX!
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*/
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#ifdef LEX_SCANNER
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/* int yyoutput(int); */
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void yyoutput(int);
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#else
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void yyoutput(int);
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#endif
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#if defined(__cplusplus) || defined(__STDC__)
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#if defined(__cplusplus) && defined(__EXTERN_C__)
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}
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#endif
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#endif
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%}
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%union {
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char *s;
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/* struct pexpr *expr; */
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}
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%start commands
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%token <s> INTEGER 1
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%token <s> WORD 2
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%token <s> STRING 3
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%token <s> PERIOD 13
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%token OPEN 4
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%token CLOSE 5
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%token COMMA 6
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%token NEWLINE 7
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%token ERROR 8
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%token OPEN_SQUARE 9
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%token CLOSE_SQUARE 10
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%token EQUALS 11
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%token EXP 14
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/* %type <expr> command expr arglist arg arg1 */
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%type <s> command expr arglist arg arg1
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%%
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commands : /* empty */
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| commands command
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;
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command : WORD PERIOD
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{process_command(cexpr_cons(make_word($1), NULL)); free($1);}
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| expr PERIOD
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{process_command($1);}
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| error PERIOD
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{syntax_error("Unrecognized command.");}
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;
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expr : WORD OPEN arglist CLOSE
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{$$ = cexpr_cons(make_word($1), $3); free($1);}
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| OPEN_SQUARE CLOSE_SQUARE
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{$$ = cexpr_cons(NULL, NULL);}
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| OPEN_SQUARE arglist CLOSE_SQUARE
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{$$ = $2; }
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;
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arglist :
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{$$ = NULL;}
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| arg
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{$$ = cexpr_cons($1, NULL);}
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arg COMMA arglist
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{$$ = cexpr_cons($1, $3);}
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;
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arg : WORD EQUALS arg1
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{$$ = cexpr_cons(make_word("="), cexpr_cons(make_word($1), cexpr_cons($3, NULL)));
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free($1); }
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| arg1
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{$$ = $1; }
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arg1 : WORD
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{$$ = make_word($1); free($1);}
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| STRING
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{$$ = make_string($1); free($1);}
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| INTEGER
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{$$ = make_integer($1); free($1);}
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| INTEGER PERIOD INTEGER
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{$$ = make_real($1, $3); free($1); free($3); }
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| INTEGER EXP INTEGER
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{$$ = make_exp($1, $3); free($1); free($3); }
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INTEGER PERIOD INTEGER EXP INTEGER
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{$$ = make_exp2($1, $3, $5); free($1); free($3);
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free($5); }
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| expr
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{$$ = $1;}
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;
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%%
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#include "lex_yy.c"
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/*
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void yyerror(s)
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char *s;
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{
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syntax_error(s);
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}
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*/
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/* Ansi prototype. If this doesn't work for you... uncomment
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the above instead.
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*/
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void yyerror(char *s)
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{
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syntax_error(s);
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}
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/*
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* Unfortunately, my DOS version of FLEX
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* requires yywrap to be #def'ed, whereas
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* the UNIX flex expects a proper function.
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*/
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/* Not sure if __SC__ is the appropriate thing
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* to test
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*/
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#ifndef __SC__
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#ifdef USE_DEFINE
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#ifndef yywrap
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#define yywrap() 1
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#endif
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#else if !defined(__alpha) && !defined(__ultrix)
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int yywrap() { return 1; }
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#endif
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#endif
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