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tokenizer.c
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tokenizer.c
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/**
* JCUnit - a very simple unit testing framework for C
*
* Copyright (C) 2021-2022 Denis Korchagin <denis.korchagin.1995@gmail.com>
*
* This file is part of JCUnit
*
* For the full license information, please view the LICENSE
* file that was distributed with this source code.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation of version 2
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "headers/token.h"
#include "headers/object-allocator.h"
#include "headers/string.h"
#include "headers/errors.h"
struct token newline_token = {0}, eof_token = {0};
struct token * make_punctuator_token(int ch)
{
struct token * token = alloc_token();
token->kind = TOKEN_KIND_PUNCTUATOR;
token->content.ch = ch;
return token;
}
struct token * get_one_string(struct tokenizer_context * context, int ch)
{
static char buffer[MAX_STRING_LEN] = {0};
char * w = buffer;
ch = get_one_char(context);
unsigned int len = 0;
while (len < MAX_STRING_LEN && ch != '"') {
if (ch == EOF) {
jcunit_fatal_error("Unterminated string!");
}
if (ch == '\n') {
jcunit_fatal_error("Newline inside the string!");
}
*w++ = (char)ch;
++len;
ch = get_one_char(context);
}
if (len >= MAX_STRING_LEN) {
jcunit_fatal_error("Too long string!");
}
struct token * token = alloc_token();
token->kind = TOKEN_KIND_STRING;
token->content.string = make_string(buffer, len);
return token;
}
struct tokenizer_context * make_tokenizer_context(const char * filename)
{
struct tokenizer_context * context = alloc_tokenizer_context();
FILE * source = fopen(filename, "r");
if (source == NULL) {
jcunit_fatal_error("Can't read file \"%s\": %s", filename, strerror(errno));
}
memset((void *)context, 0, sizeof(struct tokenizer_context));
context->filename = filename;
context->source = source;
return context;
}
void destroy_tokenizer_context(struct tokenizer_context * context)
{
assert(context != NULL);
if (context->source != NULL) {
fclose(context->source);
}
free_tokenizer_context(context);
}
void init_tokenizer(void)
{
struct token * token;
token = &eof_token;
token->kind = TOKEN_KIND_EOF;
token->content.ch = EOF;
token = &newline_token;
token->kind = TOKEN_KIND_NEWLINE;
token->content.ch = '\n';
}
int get_one_char(struct tokenizer_context * context)
{
if (context->char_buffer_pos > 0)
return context->char_buffer[--context->char_buffer_pos];
return fgetc(context->source);
}
void unget_one_char(struct tokenizer_context * context, int ch)
{
assert(context->char_buffer_pos < MAX_CHAR_BUFFER_SIZE);
if (context->char_buffer_pos >= MAX_CHAR_BUFFER_SIZE) {
jcunit_fatal_error("The char buffer is overflow!");
}
if (ch != EOF)
context->char_buffer[context->char_buffer_pos++] = (char)ch;
}
int peek_one_char(struct tokenizer_context * context)
{
int ch = get_one_char(context);
unget_one_char(context, ch);
return ch;
}
struct token * get_one_name(struct tokenizer_context * context, int ch, unsigned int token_kind)
{
static char buffer[MAX_NAME_LEN] = {0};
char * w = buffer;
unsigned int len = 0;
for (;;) {
*w++ = (char)ch;
++len;
if (len >= MAX_NAME_LEN) {
jcunit_fatal_error("Too long name '%.*s' exceed %d characters!", len, buffer, MAX_NAME_LEN);
}
ch = get_one_char(context);
if (!is_name_char(ch)) {
break;
}
}
unget_one_char(context, ch);
struct token * token = alloc_token();
token->kind = token_kind;
token->content.string = make_string(buffer, len);
return token;
}
struct token * get_one_token(struct tokenizer_context * context)
{
if (context->token_buffer_pos > 0)
return context->token_buffer[--context->token_buffer_pos];
int ch = get_one_char(context);
if (ch == EOF) {
return &eof_token;
}
if (ch == '@') {
int next = get_one_char(context);
if (is_start_name_char(next)) {
return get_one_name(context, next, TOKEN_KIND_DIRECTIVE);
}
if (next == '@') {
goto character;
}
unget_one_char(context, next);
goto character;
}
if (context->mode == TOKENIZER_MODE_DIRECTIVE_AND_TEXT) {
goto character;
}
if (ch == '\n') {
return &newline_token;
}
if (ch == ',') {
return make_punctuator_token(ch);
}
if (ch == '(') {
return make_punctuator_token(ch);
}
if (ch == ')') {
return make_punctuator_token(ch);
}
if (ch == '=') {
return make_punctuator_token(ch);
}
if (ch == '"') {
return get_one_string(context, ch);
}
if (is_start_name_char(ch)) {
return get_one_name(context, ch, TOKEN_KIND_NAME);
}
struct token * token;
character:
token = alloc_token();
token->kind = TOKEN_KIND_CHARACTER;
token->content.ch = ch;
return token;
}
void unget_one_token(struct tokenizer_context * context, struct token * token)
{
assert(token != NULL);
if (context->token_buffer_pos >= MAX_TOKEN_BUFFER_SIZE) {
jcunit_fatal_error("The token buffer is overflow!");
}
if (!is_token_eof(token))
context->token_buffer[context->token_buffer_pos++] = token;
}
struct token * peek_one_token(struct tokenizer_context * context)
{
struct token * token = get_one_token(context);
unget_one_token(context, token);
return token;
}
bool is_token_directive_equals(struct token * token, const char * name)
{
return token->kind == TOKEN_KIND_DIRECTIVE && string_equals_with_cstring(token->content.string, name);
}
bool is_token_punctuator(struct token * token, int ch)
{
if (token->kind != TOKEN_KIND_PUNCTUATOR)
return false;
return token->content.ch == ch;
}