85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
#define FRONTEND_IMPLEMENTATION
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#include "../frontend.h"
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#include "token.h"
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#define ROUND_IDX(idx) ((idx) % tokbuf->cap)
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tok_t* pop_tok(tok_buf_t* tokbuf) {
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if (tokbuf->size == 0) {
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error("no token to pop");
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return NULL;
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}
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int idx = tokbuf->cur;
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tokbuf->cur = ROUND_IDX(idx + 1);
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tokbuf->size -= 1;
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return tokbuf->buf + idx;
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}
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void flush_peek_tok(tok_buf_t* tokbuf) {
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tokbuf->peek = tokbuf->cur;
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}
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void init_tokbuf(tok_buf_t *tokbuf, void *stream, get_tokbuf_func gettok) {
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tokbuf->cur = 0;
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tokbuf->end = 0;
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tokbuf->peek = 0;
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tokbuf->size = 0;
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tokbuf->stream = stream;
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tokbuf->gettok = gettok;
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tokbuf->buf = NULL;
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tokbuf->cap = 0;
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}
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tok_t *peek_tok(tok_buf_t *tokbuf) {
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int idx = tokbuf->peek;
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tokbuf->peek = ROUND_IDX(idx + 1);
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if (tokbuf->size >= tokbuf->cap) {
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error("peek too deep, outof array size");
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}
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if (idx == tokbuf->end) {
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if (tokbuf->size == tokbuf->cap) {
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error("peek_tok buffer overflow");
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}
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if (tokbuf->gettok == NULL) {
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error("peek_tok can not got tok");
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}
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tokbuf->gettok(tokbuf->stream, &(tokbuf->buf[idx]));
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tokbuf->size++;
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tokbuf->end = tokbuf->peek;
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}
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return &(tokbuf->buf[idx]);
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}
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tok_type_t peek_tok_type(tok_buf_t* tokbuf) {
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return peek_tok(tokbuf)->type;
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}
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int expect_pop_tok(tok_buf_t* tokbuf, tok_type_t type) {
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flush_peek_tok(tokbuf);
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tok_t* tok = peek_tok(tokbuf);
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if (tok->type != type) {
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error("expected tok: %s, got %s", get_tok_name(type), get_tok_name(tok->type));
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} else {
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pop_tok(tokbuf);
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}
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return 0;
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}
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// 生成字符串映射（根据需求选择#str或#name）
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static const char* token_strings[] = {
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// 普通token使用#str
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#define X(str, tok) [tok] = #str,
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TOKEN_TABLE
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#undef X
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// 关键字使用#name
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#define X(name, std, tok) [tok] = #name,
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KEYWORD_TABLE
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#undef X
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};
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const char* get_tok_name(tok_type_t type) {
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return token_strings[type];
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}
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