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130 lignes
2.2 KiB
130 lignes
2.2 KiB
%{
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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;
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enum op { String, Query, Star, Plus } ;
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typedef union Node Node;
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struct String { enum op type; char *string; };
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struct Query { enum op type; Node *children[1]; };
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struct Star { enum op type; Node *children[1]; };
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struct Plus { enum op type; Node *children[1]; };
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union Node {
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enum op type;
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struct String String;
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struct Query Query;
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struct Star Star;
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struct Plus Plus;
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};
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Node *mkString(char *s)
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{
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Node *node= calloc(1, sizeof(struct String));
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node->type= String;
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node->String.string= strdup(s);
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return node;
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}
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Node *mkQuery(Node *n)
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{
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Node *node= calloc(1, sizeof(struct Query));
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node->type= Query;
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node->Query.children[0]= n;
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return node;
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}
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Node *mkStar(Node *n)
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{
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Node *node= calloc(1, sizeof(struct Star));
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node->type= Star;
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node->Star.children[0]= n;
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return node;
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}
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Node *mkPlus(Node *n)
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{
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Node *node= calloc(1, sizeof(struct Plus));
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node->type= Plus;
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node->Plus.children[0]= n;
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return node;
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}
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void print(Node *node)
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{
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switch (node->type) {
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case String:
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printf("\"%s\"", node->String.string);
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return;
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case Query:
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print(node->Query.children[0]);
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printf("?");
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return;
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case Star:
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print(node->Query.children[0]);
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printf("*");
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return;
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case Plus:
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print(node->Query.children[0]);
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printf("+");
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return;
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}
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abort();
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}
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void println(Node *node)
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{
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print(node);
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printf("\n");
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}
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#define YYSTYPE Node *
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YYSTYPE yylval = 0;
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%}
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start = - o:or { yylval = o }
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or = a:and "|" - o:or { $$ = mkOr(o, a) }
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| a:and { $$ = a }
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and = p:postfix a:and { $$ = mkAnd(p, a) }
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| p:postfix { $$ = p }
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postfix = s:atom ( "?" - { s = mkQuery(s) }
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| "*" - { s = mkStar(s) }
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| "+" - { s = mkPlus(s) }
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)? { $$ = s}
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atom = string | class
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string = '"' < [^"]* > '"' { $$ = mkString(yytext) } -
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class = '[' ... ']'
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- = space*
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space = [ \t] | '\n' '\r'* | '\r' '\n'*
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%%
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int main(int argc, char **argv)
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{
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while (yyparse()) {
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println(yylval);
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}
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return 0;
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(void)yySet;
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(void)yyPop;
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(void)yyPush;
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(void)yyAccept;
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(void)yymatchDot;
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(void)yymatchString;
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(void)yymatchChar;
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}
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