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/*
* blogc: A blog compiler.
* Copyright (C) 2014-2019 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#include <stdlib.h>
#include <string.h>
#include <squareball.h>
#include "content-parser.h"
#include "source-parser.h"
typedef enum {
SOURCE_START = 1,
SOURCE_CONFIG_KEY,
SOURCE_CONFIG_VALUE_START,
SOURCE_CONFIG_VALUE,
SOURCE_SEPARATOR,
SOURCE_CONTENT_START,
SOURCE_CONTENT,
} blogc_source_parser_state_t;
sb_trie_t*
blogc_source_parse(const char *src, size_t src_len, sb_error_t **err)
{
if (err == NULL || *err != NULL)
return NULL;
size_t current = 0;
size_t start = 0;
size_t end_excerpt = 0;
char *key = NULL;
char *tmp = NULL;
char *content = NULL;
sb_trie_t *rv = sb_trie_new(free);
blogc_source_parser_state_t state = SOURCE_START;
while (current < src_len) {
char c = src[current];
switch (state) {
case SOURCE_START:
if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
break;
if (c >= 'A' && c <= 'Z') {
state = SOURCE_CONFIG_KEY;
start = current;
break;
}
if (c == '-') {
state = SOURCE_SEPARATOR;
break;
}
*err = sb_parser_error_new(src, src_len, current,
"source: Can't find a configuration key or the content "
"separator.");
break;
case SOURCE_CONFIG_KEY:
if ((c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_')
break;
if (c == ':') {
key = sb_strndup(src + start, current - start);
if (((current - start == 8) &&
(0 == strncmp("FILENAME", src + start, 8))) ||
((current - start == 7) &&
(0 == strncmp("CONTENT", src + start, 7))) ||
((current - start == 14) &&
(0 == strncmp("DATE_FORMATTED", src + start, 14))) ||
((current - start == 20) &&
(0 == strncmp("DATE_FIRST_FORMATTED", src + start, 20))) ||
((current - start == 19) &&
(0 == strncmp("DATE_LAST_FORMATTED", src + start, 19))) ||
((current - start == 10) &&
(0 == strncmp("PAGE_FIRST", src + start, 10))) ||
((current - start == 13) &&
(0 == strncmp("PAGE_PREVIOUS", src + start, 13))) ||
((current - start == 12) &&
(0 == strncmp("PAGE_CURRENT", src + start, 12))) ||
((current - start == 9) &&
(0 == strncmp("PAGE_NEXT", src + start, 9))) ||
((current - start == 9) &&
(0 == strncmp("PAGE_LAST", src + start, 9))) ||
((current - start == 13) &&
(0 == strncmp("BLOGC_VERSION", src + start, 13))))
{
*err = sb_strerror_new_printf(
"source: '%s' variable is forbidden in source files. "
"It will be set for you by the compiler.", key);
break;
}
state = SOURCE_CONFIG_VALUE_START;
break;
}
*err = sb_parser_error_new(src, src_len, current,
"source: Invalid configuration key.");
break;
case SOURCE_CONFIG_VALUE_START:
if (c != '\n' && c != '\r') {
state = SOURCE_CONFIG_VALUE;
start = current;
break;
}
sb_trie_insert(rv, key, sb_strdup(""));
free(key);
key = NULL;
state = SOURCE_START;
break;
case SOURCE_CONFIG_VALUE:
if (c == '\n' || c == '\r') {
tmp = sb_strndup(src + start, current - start);
sb_trie_insert(rv, key, sb_strdup(sb_str_strip(tmp)));
free(tmp);
free(key);
key = NULL;
state = SOURCE_START;
}
break;
case SOURCE_SEPARATOR:
if (c == '-')
break;
if (c == '\n' || c == '\r') {
state = SOURCE_CONTENT_START;
break;
}
*err = sb_parser_error_new(src, src_len, current,
"source: Invalid content separator. Must be more than one "
"'-' characters.");
break;
case SOURCE_CONTENT_START:
if (c == '\n' || c == '\r')
break;
start = current;
state = SOURCE_CONTENT;
break;
case SOURCE_CONTENT:
if (current == (src_len - 1)) {
tmp = sb_strndup(src + start, src_len - start);
sb_trie_insert(rv, "RAW_CONTENT", tmp);
char *first_header = NULL;
char *description = NULL;
content = blogc_content_parse(tmp, &end_excerpt,
&first_header, &description);
if (first_header != NULL) {
// do not override source-provided first_header.
if (NULL == sb_trie_lookup(rv, "FIRST_HEADER")) {
// no need to free, because we are transfering memory
// ownership to the trie.
sb_trie_insert(rv, "FIRST_HEADER", first_header);
}
else {
free(first_header);
}
}
if (description != NULL) {
// do not override source-provided description.
if (NULL == sb_trie_lookup(rv, "DESCRIPTION")) {
// no need to free, because we are transfering memory
// ownership to the trie.
sb_trie_insert(rv, "DESCRIPTION", description);
}
else {
free(description);
}
}
sb_trie_insert(rv, "CONTENT", content);
sb_trie_insert(rv, "EXCERPT", end_excerpt == 0 ?
sb_strdup(content) : sb_strndup(content, end_excerpt));
}
break;
}
if (*err != NULL)
break;
current++;
}
if (*err == NULL && sb_trie_size(rv) == 0) {
// ok, nothing found in the config trie, but no error set either.
// let's try to be nice with the users and provide some reasonable
// output. :)
switch (state) {
case SOURCE_START:
*err = sb_parser_error_new(src, src_len, current,
"source: Your source file is empty.");
break;
case SOURCE_CONFIG_KEY:
*err = sb_parser_error_new(src, src_len, current,
"source: Your last configuration key is missing ':' and "
"the value");
break;
case SOURCE_CONFIG_VALUE_START:
*err = sb_parser_error_new_printf(src, src_len, current,
"source: Configuration value not provided for '%s'.", key);
break;
case SOURCE_CONFIG_VALUE:
*err = sb_parser_error_new_printf(src, src_len, current,
"source: No line ending after the configuration value for "
"'%s'.", key);
break;
case SOURCE_SEPARATOR:
case SOURCE_CONTENT_START:
case SOURCE_CONTENT:
break; // won't happen, and if even happen, shouldn't be fatal
}
}
if (*err != NULL) {
free(key);
sb_trie_free(rv);
return NULL;
}
return rv;
}
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