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#include "parse.h"
#include <errno.h>
#include <string.h>
#include <assert.h>
#include "macro.h"
#include "vcal.h"
#include "err.h"
#define TYPE vcomponent
#include "linked_list.inc.h"
#undef TYPE
#define TYPE key_val
#include "linked_list.inc.h"
#undef TYPE
/*
* name *(";" param) ":" value CRLF
*/
int parse_file(char* filename, FILE* f, vcomponent* root) {
part_context p_ctx = p_key;
SNEW(parse_ctx, ctx, filename);
PUSH(LLIST(vcomponent))(&ctx.comp_stack, root);
// vallen -+
// keylen -+ |
// | |
SNEW(content_line, cline, 100, 100);
SNEW(key_val, kv);
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.
*
* NOTE
* The above is true according to the standard. But I have
* found files with only NL. The code below ends line on the
* first of NL or CR, and then ensures that the program thinks
* it got the expected CRNL.
*/
if (c == '\r' || c == '\n') {
char s[2];
s[0] = (c == '\n' ? '\n' : fgetc(f));
s[1] = fgetc(f);
if (s[0] != '\n') { ERR_F("%s, %i", "expected newline after CR", ctx.line); }
else if (s[1] == ' ' || s[1] == '\t') {
/* Folded line, don't end line */
} else {
/* Actuall end of line, handle values. */
/* Push back the last written character to the stream,
* since it's part of the next line.
*/
if (ungetc(s[1], f) != s[1]) {
ERR_F("%s, %i", "Failed to put character back on FILE", ctx.line);
exit (2);
}
DEEP_COPY(strbuf)(cline.vals.cur->value, &ctx.str);
strbuf_cap(cline.vals.cur->value);
strbuf_soft_reset(&ctx.str);
++ctx.line;
ctx.column = 0;
handle_kv(&cline, &ctx);
p_ctx = p_key;
}
/*
* Border between param {key, value}
*/
} else if (p_ctx == p_param_name && c == '=') {
DEEP_COPY(strbuf)(&kv.key, &ctx.str);
strbuf_cap(&kv.key);
strbuf_soft_reset(&ctx.str);
p_ctx = p_param_value;
/*
* One of four cases:
* 1) end of key , start of value
* 2) ,, key , ,, param
* 3) ,, param, ,, param
* 4) ,, param, ,, value
*/
} else if ((p_ctx == p_key || p_ctx == p_param_value) && (c == ':' || c == ';')) {
strbuf* dest;
if (p_ctx == p_key) dest = &cline.key;
else if (p_ctx == p_param_value) dest = &kv.val;
DEEP_COPY(strbuf)(dest, &ctx.str);
strbuf_cap(dest);
strbuf_soft_reset(&ctx.str);
if (p_ctx == p_param_value) {
/* push kv pair */
NEW (key_val, _kv);
DEEP_COPY(key_val)(_kv, &kv);
PUSH(LLIST(key_val))(&cline.params, _kv);
}
if (c == ':') p_ctx = p_value;
else if (c == ';') p_ctx = p_param_name;
} else {
strbuf_append(&ctx.str, c);
++ctx.column;
}
}
if (! feof(f)) {
ERR("Error parsing");
} else if (cline.vals.cur->value->len != 0 && ctx.str.ptr != 0) {
/*
* The standard (3.4, l. 2675) says that each icalobject must
* end with CRLF. My files however does not, so we also parse
* the end here.
*/
DEEP_COPY(strbuf)(cline.vals.cur->value, &ctx.str);
strbuf_cap(cline.vals.cur->value);
handle_kv(&cline, &ctx);
}
FREE(content_line)(&cline);
assert(POP(LLIST(vcomponent))(&ctx.comp_stack) == root);
assert(EMPTY(LLIST(strbuf))(&ctx.key_stack));
assert(EMPTY(LLIST(vcomponent))(&ctx.comp_stack));
FREE(parse_ctx)(&ctx);
FREE(key_val)(&kv);
return 0;
}
int handle_kv (
content_line* cline,
parse_ctx* ctx
) {
if (strbuf_c(&cline->key, "BEGIN")) {
/* should be one of:
* VCALENDAR, VEVENT, VALARM, VTODO, VTIMEZONE,
* and possibly some others I forget.
*/
NEW(strbuf, s);
DEEP_COPY(strbuf)(s, cline->vals.cur->value);
PUSH(LLIST(strbuf))(&ctx->key_stack, s);
NEW(vcomponent, e,
s->mem,
ctx->filename);
e->parent = PEEK(LLIST(vcomponent))(&ctx->comp_stack);
PUSH(LLIST(vcomponent))(&ctx->comp_stack, e);
} else if (strbuf_c(&cline->key, "END")) {
strbuf* s = POP(LLIST(strbuf))(&ctx->key_stack);
if (strbuf_cmp(s, cline->vals.cur->value) != 0) {
ERR_F("Expected END:%s, got END:%s.\n%s line %i",
s->mem, cline->vals.cur->value->mem, PEEK(LLIST(vcomponent))(&ctx->comp_stack)->filename, ctx->line);
PUSH(LLIST(strbuf))(&ctx->key_stack, s);
return -1;
} else {
FFREE(strbuf, s);
/* Received propper end, push cur into parent */
vcomponent* cur = POP(LLIST(vcomponent))(&ctx->comp_stack);
// TODO should this instead be done at creation time?
PUSH(vcomponent)(PEEK(LLIST(vcomponent))(&ctx->comp_stack), cur);
}
} else {
NEW(content_line, c);
content_line_copy(c, cline);
PUSH(TRIE(content_line))(
&PEEK(LLIST(vcomponent))(&ctx->comp_stack)->clines,
c->key.mem, c);
if ( SIZE(LLIST(key_val))(&c->params) != 0 ) {
RESET(LLIST(key_val))(&cline->params);
}
}
return 0;
}
INIT_F(parse_ctx, char* filename) {
INIT(LLIST(strbuf), &this->key_stack);
INIT(LLIST(vcomponent), &this->comp_stack);
this->filename = calloc(sizeof(*filename), strlen(filename) + 1);
strcpy(this->filename, filename);
this->line = 0;
this->column = 0;
INIT(strbuf, &this->str);
return 0;
}
FREE_F(parse_ctx) {
FREE(LLIST(strbuf))(&this->key_stack);
FREE(LLIST(vcomponent))(&this->comp_stack);
free(this->filename);
this->line = 0;
this->column = 0;
FREE(strbuf)(&this->str);
return 0;
}
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