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/*
Copyright (C) 2016 Paweł Redman
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; either version 3
of the License, or (at your option) any later version.
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 "common.h"
#include <ctype.h>
int lexer_open(lexer_state_t *ls, const char *path, vstr_t *token)
{
ls->error = 0;
ls->path = path;
ls->fp = fopen(path, "r");
if (!ls->fp)
return -errno;
ls->eof = false;
ls->token = token;
ls->buf_e = ls->buf_c = ls->buf;
ls->cc = ls->lc = ls->Cc = 0;
ls->in_token = false;
ls->in_quote = false;
ls->in_comment = false;
return 0;
}
void lexer_close(lexer_state_t *ls)
{
fclose(ls->fp);
}
//RETURN VALUES
// <0 on error
// 0 on success
// note: sets ls->eof to true if there's no more data left
static int fill_buffer(lexer_state_t *ls)
{
size_t read;
read = fread(ls->buf, 1, sizeof(ls->buf), ls->fp);
debug("read = %zu\n", read);
if (read < sizeof(ls->buf)) {
if (ferror(ls->fp))
return -errno;
ls->eof = true;
debug("no data left, ls->fp closed\n");
}
ls->buf_c = ls->buf;
ls->buf_e = ls->buf + read;
return 0;
}
//RETURN VALUES
// -ENOMEM
// -EAGAIN when the buffer runs out
// 0 on success
// 1 when no data is left
static int read_buffer(lexer_state_t *ls)
{
while (ls->buf_c < ls->buf_e) {
bool ret_token = false;
debug("*ls->buf_c = %c, ls->last = %c\n", *ls->buf_c, ls->last);
if (*ls->buf_c == '\n') {
ls->lc++;
ls->Cc = 0;
}
if (ls->in_comment) {
if (*ls->buf_c == '\n')
ls->in_comment = false;
} else if (isspace(*ls->buf_c) && !ls->in_quote) {
if (ls->in_token) {
ls->in_token = false;
ret_token = true;
}
} else if (*ls->buf_c == '/' && (ls->cc && ls->last == '/')) {
ls->in_comment = true;
ls->in_token = false;
ls->token->size--; // remove the first slash
if (ls->token->size)
ret_token = true;
} else if (*ls->buf_c == '\"' &&
(ls->cc && ls->last != '\\')) {
ls->in_quote = !ls->in_quote;
if (!ls->in_quote) {
ls->in_token = false;
ret_token = true;
}
} else {
if (!ls->in_token) {
ls->in_token = true;
}
}
if (ls->in_token)
if (vstr_putc(ls->token, *ls->buf_c)) {
ls->error = ENOMEM;
return -ENOMEM;
}
ls->last = *ls->buf_c;
ls->buf_c++;
ls->cc++;
ls->Cc++;
if (ret_token)
return 0;
}
if (ls->eof) {
if (ls->token->size > 0)
return 0;
return 1;
}
return -EAGAIN;
}
//RETURN VALUES
// <0 on error
// 0 on success
// 1 when no data is left
int lexer_get_token(lexer_state_t *ls)
{
int ret;
vstr_clear(ls->token);
while (1) {
ret = read_buffer(ls);
debug("read_buffer = %i\n", ret);
if (ret != -EAGAIN)
return ret;
ret = fill_buffer(ls);
debug("fill_buffer = %i\n", ret);
if (ret < 0)
return ret;
}
}
void lexer_perror(lexer_state_t *ls, const char *fmt, ...)
{
va_list vl;
fprintf(stderr, "%s:%zu:%zu: ", ls->path, ls->lc + 1, ls->Cc + 1);
if (ls->error) {
perror(NULL);
} else {
va_start(vl, fmt);
vfprintf(stderr, fmt, vl);
va_end(vl);
}
}
void lexer_perror_eg(lexer_state_t *ls, const char *expected)
{
if (ls->eof && ls->buf_c == ls->buf_e)
lexer_perror(ls, "expected %s, got EOF\n", expected);
else {
vstr_termz(ls->token);
lexer_perror(ls, "expected %s, got \"%s\"\n", expected,
ls->token->data);
}
}
int lexer_assert(lexer_state_t *ls, const char *match, const char *desc)
{
int ret;
ret = lexer_get_token(ls);
if (ret) {
lexer_perror(ls, "expected %s%s\"%s\", got EOF\n",
(desc ? desc : ""), (desc ? " " : ""), match);
return 1;
}
if (vstr_cmp(ls->token, match)) {
vstr_termz(ls->token);
lexer_perror(ls, "expected %s%s\"%s\", got \"%s\"\n",
(desc ? desc : ""), (desc ? " " : ""), match,
ls->token->data);
return 1;
}
return 0;
}
//RETURN VALUE
// -1 on eof (also success)
// 0 on success
// 1 on error
int lexer_assert_or_eof(lexer_state_t *ls, const char *match, const char *desc)
{
int ret;
ret = lexer_get_token(ls);
if (ret < 0) {
perror("lexer");
return 1;
}
if (ret == 1) {
return -1;
}
if (vstr_cmp(ls->token, match)) {
lexer_perror(ls, "expected %s%s\"%s\" or EOF, got \"%.*s\"\n",
(desc ? desc : ""), (desc ? " " : ""), match,
(int)ls->token->size, ls->token->data);
return 1;
}
return 0;
}
int lexer_get_floats(lexer_state_t *ls, float *out, size_t count)
{
size_t i;
for (i = 0; i < count; i++) {
if (lexer_get_token(ls)) {
lexer_perror_eg(ls, "a number");
return 1;
}
out[i] = vstr_atof(ls->token);
}
return 0;
}
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