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// Copyright (c) 2024, Marvin Borner <dev@marvinborner.de>
// SPDX-License-Identifier: MIT
#include <parse.h>
#include <log.h>
#include <term.h>
Term *parse_blc_fp(FILE *fp)
{
Term *res = 0;
char a = getc(fp);
if (a == '0') {
char b = getc(fp);
if (b == '0') {
res = term_new(ABS);
res->u.abs.body = parse_blc_fp(fp);
} else if (b == '1') {
res = term_new(APP);
res->u.app.lhs = parse_blc_fp(fp);
res->u.app.rhs = parse_blc_fp(fp);
}
} else if (a == '1') {
res = term_new(IDX);
res->u.index = 0;
while (getc(fp) == '1')
res->u.index++;
}
if (!res)
fatal("invalid parsing state!\n");
return res;
}
Term *parse_blc(const char **term)
{
Term *res = 0;
if (!**term) {
fatal("invalid parsing state!\n");
} else if (**term == '0' && *(*term + 1) == '0') {
(*term) += 2;
res = term_new(ABS);
res->u.abs.body = parse_blc(term);
} else if (**term == '0' && *(*term + 1) == '1') {
(*term) += 2;
res = term_new(APP);
res->u.app.lhs = parse_blc(term);
res->u.app.rhs = parse_blc(term);
} else if (**term == '1') {
const char *cur = *term;
while (**term == '1')
(*term)++;
res = term_new(IDX);
res->u.index = *term - cur - 1;
(*term)++;
} else {
(*term)++;
res = parse_blc(term);
}
return res;
}
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