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#include "parse.h"
#include "macro.h"
/*
* TODO currently not all pointers inside strings are reset correctly,
* leading to old garbage data being read way to much.
*
* A better ERR macro would solve most problems,
* along with the introduction of a MSG macro.
*/
#include <errno.h>
#include <string.h>
int parse_file(FILE* f, vcalendar* cal) {
int segments = 1;
string str;
init_string (&str, segments * SEGSIZE);
part_context p_ctx = p_key;
scope_context s_ctx = s_none;
int keylen = 100;
int vallen = 100;
int line = 0;
// TODO this can apparently segfault...
NEW(vevent, ev, /**/ 100);
content_line cline;
init_content_line (&cline, keylen, vallen);
char c;
while ( (c = fgetc(f)) != EOF) {
// D E S (-48 '\320')
/*
* A carrige return means that the current line is at an
* end. The following character should always be \n.
* However, if the first character on the next line is a
* whitespace then the two lines should be concatenated.
*/
if (c == '\r') {
char s[2];
s[0] = fgetc(f);
s[1] = fgetc(f);
if (s[0] != '\n') { ERR("expected newline after CR", line); }
else if (s[1] == ' ' || s[1] == '\t') {
/*
* Folded line, increase size of key and continue.
*/
// TODO check return value
// TODO segments is always incremented here, meaning
// that segment grows larger for every multi line
// encountered.
if (realloc_string(&str, ++segments * SEGSIZE) != 0) { /* TODO signal error */
ERR("Failed to realloc string", line);
exit (1);
}
continue;
} else {
/*
* Actuall end of line, handle values.
*/
if (ungetc(s[1], f) != s[1]) { /* TODO signal error */
exit (2);
}
/* At TRUE end of line */
/*
if (str.ptr + 1 > vallen) {
vallen = str.ptr + 1;
// TODO this fails
realloc_string(&cline.val, vallen);
}
*/
copy_strbuf(&cline.val, &str);
strbuf_cap(&cline.val);
++line;
/* We just got a value */
// LINE(line, key.mem, val.mem);
if (strbuf_c(&cline.key, "LOCATION")) {
if (strbuf_c(&cline.val, "")) return 1;
LINE(line, cline.key.mem, cline.val.mem);
}
handle_kv(cal, ev, &cline, line, &s_ctx);
strbuf_soft_reset(&str);
p_ctx = p_key;
continue;
}
} else if (p_ctx == p_key && c == ':') {
/*
if (str.ptr + 1 > keylen) {
keylen = str.ptr + 1;
// TODO this might break everything
realloc_string(&key, keylen);
}
*/
copy_strbuf(&cline.key, &str);
strbuf_cap(&cline.key);
strbuf_soft_reset(&str);
p_ctx = p_value;
continue;
}
strbuf_append(&str, c);
}
if (! feof(f)) {
ERR("Error parsing", errno);
} else {
/*
* Close last pair if the file is lacking trailing whitespace.
* A file with trailing whitespace would however fail.
* TODO check the spec and adjust accordingly
*/
if (str.ptr + 1 > vallen) {
vallen = str.ptr + 1;
realloc_string(&cline.val, vallen);
}
copy_strbuf(&cline.val, &str);
*strbuf_cur(&cline.val) = 0;
}
free_string(&str);
content_line_free(&cline);
return 0;
}
int handle_kv(
vcalendar* cal,
vevent* ev,
content_line* cline,
int line,
scope_context* s_ctx
) {
switch (*s_ctx) {
case s_none:
if (! (strbuf_c(&cline->key, "BEGIN") && strbuf_c(&cline->val, "VCALENDAR"))) {
ERR("Invalid start of calendar", line);
return 1;
}
*s_ctx = s_calendar;
break;
case s_calendar:
if (strbuf_c(&cline->key, "BEGIN")) {
if (strbuf_c(&cline->val, "VEVENT")) {
*s_ctx = s_event;
break;
} else {
ERR("Unsupported start", line);
return 2;
}
} else if (strbuf_c(&cline->key, "END")) {
if (strbuf_c(&cline->val, "VCALENDAR")) {
*s_ctx = s_none;
break;
}
}
break;
case s_event:
if (strbuf_c(&cline->key, "END")) {
if (strbuf_c(&cline->val, "VEVENT")) {
push_event(cal, ev);
*s_ctx = s_calendar;
} else {
ERR("Trying to end something, expected VEVENT", line);
return 3;
}
} else {
content_line* c = malloc(sizeof(*c));
content_line_copy(c, cline);
add_content_line (ev, c);
}
break;
}
return 0;
}
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