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#include "parse.h"
#include <errno.h>
#include <string.h>
#include "macro.h"
int parse_file(FILE* f, vcalendar* cal) {
int segments = 1;
SNEW(strbuf, str, segments * SEGSIZE);
part_context p_ctx = p_key;
scope_context s_ctx = s_none;
int keylen = 100;
int vallen = 100;
int line = 0;
NEW(vevent, ev);
SNEW(content_line, cline, keylen, vallen);
char c;
while ( (c = fgetc(f)) != EOF) {
/*
* 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 segments is always incremented here, meaning
* that segment grows larger for every multi line
* encountered.
*/
if (strbuf_realloc(&str, ++segments * SEGSIZE) != 0) {
ERR("Failed to realloc strbuf", line);
exit (1);
}
continue;
} else {
/* Actuall end of line, handle values. */
if (ungetc(s[1], f) != s[1]) {
ERR("Failed to put character back on FILE", line);
exit (2);
}
/* At TRUE end of line */
if (str.ptr + 1 > vallen) {
vallen = str.ptr + 1;
strbuf_realloc(&cline.val, vallen);
}
strbuf_copy(&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
strbuf_realloc(&key, keylen);
}
*/
strbuf_copy(&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;
strbuf_realloc(&cline.val, vallen);
}
strbuf_copy(&cline.val, &str);
*strbuf_cur(&cline.val) = 0;
}
FREE(strbuf)(&str);
FREE(content_line)(&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 {
NEW(content_line, c);
content_line_copy(c, cline);
add_content_line (ev, c);
}
break;
}
return 0;
}
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