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92 lines
1.7 KiB
Plaintext
92 lines
1.7 KiB
Plaintext
%{
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char rcsid_gram[] = "$Id$";
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#include <stdio.h>
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#include "b.h"
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#include "fe.h"
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void doGram(List);
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%}
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%union {
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int y_int;
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char *y_string;
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Arity y_arity;
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Binding y_binding;
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PatternAST y_patternAST;
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RuleAST y_ruleAST;
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List y_list;
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IntList y_intlist;
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}
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%start full
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%term ERROR
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%term K_TERM
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%term K_GRAM
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%term K_START
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%term K_PPERCENT
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%term INT
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%term ID
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%token <y_string> ID
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%token <y_int> INT
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%type <y_arity> decl
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%type <y_binding> binding
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%type <y_intlist> cost costtail
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%type <y_ruleAST> rule
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%type <y_patternAST> pattern
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%type <y_list> decls rules bindinglist grammarlist
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%%
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full : spec
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| spec K_PPERCENT
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{ yyfinished(); }
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;
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spec : decls K_PPERCENT rules
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{ doSpec($1, $3); }
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;
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decls : /* lambda */ { $$ = 0; }
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| decls decl { $$ = newList($2, $1); }
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;
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decl : K_TERM bindinglist { $$ = newArity(-1, $2); }
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| K_GRAM grammarlist { $$ = 0; doGram($2); }
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| K_START ID { $$ = 0; doStart($2); } /* kludge */
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;
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grammarlist : /* lambda */ { $$ = 0; }
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| grammarlist ID { $$ = newList($2, $1); }
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;
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bindinglist : /* lambda */ { $$ = 0; }
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| bindinglist binding { $$ = newList($2, $1); }
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;
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binding : ID '=' INT { $$ = newBinding($1, $3); }
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;
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rules : /* lambda */ { $$ = 0; }
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| rules rule { $$ = newList($2, $1); }
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;
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rule : ID ':' pattern '=' INT cost ';' { $$ = newRuleAST($1, $3, $5, $6); }
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;
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pattern : ID { $$ = newPatternAST($1, 0); }
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| ID '(' pattern ')' { $$ = newPatternAST($1, newList($3,0)); }
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| ID '(' pattern ',' pattern ')' { $$ = newPatternAST($1, newList($3, newList($5, 0))); }
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;
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cost : /* lambda */ { $$ = 0; }
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| '(' INT costtail ')' { $$ = newIntList($2, $3); }
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;
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costtail : /* lambda */ { $$ = 0; }
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| ',' INT costtail { $$ = newIntList($2, $3); }
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| INT costtail { $$ = newIntList($1, $2); }
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;
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