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79 строки
1.7 KiB
79 строки
1.7 KiB
// 1. put a real object system inside the tree-based parsing stuff
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// 2. implement ? operator (zero or one of something)
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// 3. implement . leaf type (any valid character, NOT the end of the input)
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// 4. implement ! operator (prefix, inverts the subexpression) !"abc" matches not "abc" without moving input
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// 5. make a function to print the tree describing the pattern
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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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typedef union Object Object;
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typedef union Object *oop;
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enum type {
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Integer,
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String,
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};
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struct Integer { enum type type; int i; };
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struct String { enum type type; char *s; int len; };
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union Object {
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enum type type;
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struct Integer Integer;
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struct String String;
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};
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oop mkObject(size_t size, enum type type)
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{
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oop o= calloc(1, size);
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o->type = type;
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return o;
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}
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oop _checktype(oop object, enum type type)
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{
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if (object->type == type) return object;
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fprintf(stderr, "\naccesing type %i as if it were a %i\n", object->type, type);
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exit(1);
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return 0;
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}
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#define new(type) mkObject(sizeof(struct type), type)
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#define get(object, type, member) (_checktype(object, type)->type.member)
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oop mkInt(int i)
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{
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oop o= new(Integer);
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o->Integer.i = i;
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return o;
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}
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oop mkStr(char *s)
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{
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oop o= new(String);
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o->String.s = s;
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o->String.len = strlen(s);
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return o;
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}
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void println(oop o)
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{
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switch (o->type) {
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case Integer: printf("%i\n", get(o, Integer, i)); return;
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case String: printf("%.*s\n", get(o, String, len), get(o, String, s)); return;
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}
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abort();
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}
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int main(int argc, char **argv)
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{
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println(mkInt(42));
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println(mkStr("hello world"));
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return 0;
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}
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