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#include "parse.h"
#include <cstring>
#include <errno.h>
#include <assert.h>
#include "vcal.h"
#include "strbuf.h"
#include "err.h"
/*
* name *(";" param) ":" value CRLF
*/
int parse_file(char* filename, FILE* f, vcomponent* root) {
part_context p_ctx = p_key;
parse_ctx ctx(filename);
ctx.comp_stack.push(root);
content_line cline;
char c;
while ( (c = fgetc(f)) != EOF) {
/* We have a linebreak */
if (c == '\r' || c == '\n') {
if (fold(f, &ctx, c) > 0) {
/* Actuall end of line, handle value */
cline.push_value(ctx.str);
ctx.str.soft_reset();
handle_kv(&cline, &ctx);
p_ctx = p_key;
} /* Else continue on current line */
/* We have an escaped character */
} else if (c == '\\') {
char esc = fgetc(f);
char target;
/*
* An actuall linebreak after the backslash. Unfold the
* line and find the next "real" character, and escape
* that.
*/
if (esc == '\r' || esc == '\n') {
int ret;
if ( (ret = fold(f, &ctx, esc)) != 0) {
if (ret == 1) ERR_P(&ctx, "ESC before not folded line");
else ERR_P(&ctx, "other error: val = %i", ret);
exit (2);
} else {
esc = fgetc(f);
}
}
/* Escaped newline */
if (esc == 'n' || esc == 'N') {
target = '\n';
/* "Standard" escaped character */
} else if (esc == ';' || esc == ',' || esc == '\\') {
target = esc;
/* Invalid escaped character */
} else {
ERR_P(&ctx, "Non escapable character '%c' (%i)", esc, esc);
}
/* save escapade character as a normal character */
ctx.str += target;
++ctx.column;
++ctx.pcolumn;
/* Border between param {key, value} */
} else if (p_ctx == p_param_name && c == '=') {
// ctx.str holds param_key;
// cline.values.back()->params.push_back(new __param_set(ctx.str));
cline.values.back()->push_param_key(ctx.str);
ctx.str.soft_reset();
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 == ';')) {
if (p_ctx == p_param_value) {
/* push kv pair */
cline.values.back()->push_param_value(ctx.str);
ctx.str.soft_reset();
}
if (p_ctx == p_key) {
/* set key for content line */
cline.key = ctx.str;
cline.key.cap();
ctx.str.soft_reset();
}
if (c == ':') p_ctx = p_value;
else if (c == ';') p_ctx = p_param_name;
} else {
ctx.str += c;
++ctx.column;
++ctx.pcolumn;
}
}
if (! feof(f)) {
ERR("Error parsing");
}
/* Check to see if empty line */
else if (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.
*/
++ctx.line;
ctx.column = 0;
cline.values.back()->value = ctx.str;
cline.values.back()->value.cap();
ctx.str.soft_reset();
handle_kv(&cline, &ctx);
}
// assert(POP(LLIST(vcomponent))(&ctx.comp_stack) == root);
// assert(EMPTY(LLIST(strbuf))(&ctx.key_stack));
// assert(EMPTY(LLIST(vcomponent))(&ctx.comp_stack));
return 0;
}
int handle_kv (
content_line* cline,
parse_ctx* ctx
) {
if (cline->key == "BEGIN") {
/* should be one of:
* VCALENDAR, VEVENT, VALARM, VTODO, VTIMEZONE,
* and possibly some others I forget.
*/
ctx->key_stack.push(new strbuf(ctx->str));
// cline->values.reset();
// TODO ompty cline->second here;
// RESET(LLIST(content_set))(&cline->val);
auto e = new vcomponent(ctx->str.to_string(), ctx->filename);
e->parent = ctx->comp_stack.top();
ctx->comp_stack.push(e);
} else if (cline->key == "END") {
// strbuf* s = POP(LLIST(strbuf))(&ctx->key_stack);
strbuf* s = ctx->key_stack.top(); ctx->key_stack.pop();
if (*s == ctx->str) {
#if 0
ERR_P(ctx, "Expected END:%s, got END:%s.\n%s line",
s->mem,
CLINE_CUR_VAL(cline)->mem,
PEEK(LLIST(vcomponent))(&ctx->comp_stack)->filename);
#endif
ctx->key_stack.push(s);
return -1;
} else {
delete s;
/* Received propper end, push cur into parent */
vcomponent* cur = ctx->comp_stack.top(); ctx->comp_stack.pop();
// TODO should self instead be done at creation time?
ctx->comp_stack.push(cur);
}
} else {
content_line* c = new content_line;
// TODO make sure deep-copy
*c = *cline;
// PUSH(TRIE(content_line))(
// &PEEK(LLIST(vcomponent))(&ctx->comp_stack)->clines,
// c->key.mem, c);
// TODO?
// ctx->comp_stack.top()->clines.push_back(c->first, c);
// TODO
// RESET(LLIST(content_set))(&cline->val);
}
return 0;
}
int fold(FILE* f, parse_ctx* ctx, char c) {
int retval;
char buf[2] = {
(c == '\n' ? '\n' : (char) fgetc(f)),
(char) fgetc(f)
};
ctx->pcolumn = 1;
if (buf[0] != '\n') {
ERR_P(ctx, "expected new_line after CR");
retval = -1;
} else if (buf[1] == ' ' || buf[1] == '\t') {
retval = 0;
ctx->pcolumn++;
} else if (ungetc(buf[1], f) != buf[1]) {
ERR_P(ctx, "Failed to put character back on FILE");
retval = -2;
} else {
retval = 1;
++ctx->line;
ctx->column = 0;
}
++ctx->pline;
return retval;
}
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