diff options
| -rw-r--r-- | asm/lexer.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/asm/lexer.c b/asm/lexer.c index 6a1f027..a02c8e1 100644 --- a/asm/lexer.c +++ b/asm/lexer.c @@ -98,6 +98,37 @@ token_t tokenise_number_literal(buffer_t *buffer, size_t *column) return token; } +bool is_valid_hex_char(char c) +{ + return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || + (c >= 'A' && c <= 'F'); +} + +token_t tokenise_hex_literal(buffer_t *buffer, size_t *column) +{ + // For the x part of the literal + ++buffer->used; + token_t token = { + .type = TOKEN_LITERAL_NUMBER, .str_size = 0, .column = *column}; + for (; token.str_size < space_left(buffer) && + is_valid_hex_char(buffer->data[buffer->used + token.str_size]); + ++token.str_size) + continue; + // Setup a proper C hex literal + token.str = calloc(token.str_size + 3, 1); + token.str[0] = '0'; + token.str[1] = 'x'; + memcpy(token.str + 2, buffer->data + buffer->used, token.str_size); + token.str[token.str_size + 2] = '\0'; + buffer->used += token.str_size; + *column += token.str_size; + + // Setup the first two characters + token.str_size += 2; + printf("hex_literal: %s, %lu\n", token.str, token.str_size); + return token; +} + token_t tokenise_char_literal(buffer_t *buffer, size_t *column) { token_t token = { @@ -137,7 +168,7 @@ lerr_t tokenise_buffer(buffer_t *buffer, token_stream_t *tokens_ptr) } else if (c == ';') { - // Stop lexing till next line + // Start lexing at next line for (; space_left(buffer) > 0 && c != '\n'; ++buffer->used, c = buffer->data[buffer->used]) continue; @@ -149,6 +180,9 @@ lerr_t tokenise_buffer(buffer_t *buffer, token_stream_t *tokens_ptr) else if (isdigit(c) || (space_left(buffer) > 1 && c == '-' && isdigit(buffer->data[buffer->used + 1]))) t = tokenise_number_literal(buffer, &column); + else if (c == 'x' && space_left(buffer) > 1 && + is_valid_hex_char(buffer->data[buffer->used + 1])) + t = tokenise_hex_literal(buffer, &column); else if (is_symbol(c)) t = tokenise_symbol(buffer, &column); else if (c == '\'') |