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#ifndef TOKENIZER_CC
#define TOKENIZER_CC
#include "common.cc"
#include "source.cc"
#include "token.cc"
#include "utf8.cc"
struct Tokenizer {
Buffer* buffer;
Buffer_Stack* stack;
Tokenizer(Buffer_Stack* stack) : buffer(nullptr), stack(stack) {}
};
static inline Span tokenizer_make_span(const Tokenizer* tokenizer, usize start,
usize end) {
assert_neq(tokenizer, nullptr);
Buffer* buffer = tokenizer->buffer;
return Span(buffer->file, start, end);
}
static inline String tokenizer_make_lexeme(const Tokenizer* tokenizer,
usize start, usize end) {
assert_neq(tokenizer, nullptr);
Buffer* buffer = tokenizer->buffer;
return String(buffer->content[start], end - start);
}
static inline void tokenizer_make_token(const Tokenizer* tokenizer,
Token* token, Token_Kind kind,
usize start, usize end) {
assert_neq(tokenizer, nullptr);
assert_neq(token, nullptr);
String lexeme = tokenizer_make_lexeme(tokenizer, start, end);
Span span = tokenizer_make_span(tokenizer, start, end);
*token = Token(kind, lexeme, span);
}
static Buffer* tokenizer_get_buffer(Tokenizer* tokenizer) {
assert_neq(tokenizer, nullptr);
if (tokenizer->buffer != nullptr) return tokenizer->buffer;
Buffer* buffer = nullptr;
if (!buffer_stack_pop(tokenizer->stack, &buffer)) return nullptr;
tokenizer->buffer = buffer;
return buffer;
}
static char tokenizer_advance(const Tokenizer* tokenizer,
usize* offset) {
const String text = tokenizer->buffer->content;
unsigned char c = *text[*offset];
u8 nobytes = utf8_nobytes(c);
if (nobytes > 1) panic("no support for multi-byte chars: %c:%d", c, nobytes);
*offset += nobytes;
return c;
}
bool tokenizer_next(Tokenizer* tokenizer, Token* out) {
assert_neq(tokenizer, nullptr);
assert_neq(out, nullptr);
again:
Buffer* buffer = tokenizer_get_buffer(tokenizer);
if (buffer == nullptr) return false;
usize start = buffer->cursor;
if (start == buffer->content.length) {
tokenizer->buffer = nullptr;
goto again;
}
usize offset = start;
tokenizer_advance(tokenizer, &offset);
Token token = {};
tokenizer_make_token(tokenizer, &token, Token_Kind_Eof, start, offset);
*out = token;
buffer->cursor = offset;
return true;
}
#endif
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