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#include <ctype.h>
#include <string.h>
#include "wv_parse.h"
#include "wv_vec.h"
static void skip_whitespace(struct wv_tokenizer *t)
{
while (t->pos < t->len && isspace(t->src[t->pos]))
t->pos++;
}
static int is_delim(char c)
{
return isspace(c) || c == '=' || c == '>' || c == '/';
}
static wv_tag_id map_tag_name(const char *name, size_t len)
{
if (len == 3 && strncmp(name, "div", 3) == 0)
return WV_TAG_DIV;
if (len == 1 && strncmp(name, "a", 1) == 0)
return WV_TAG_A;
if (len == 2 && strncmp(name, "li", 2) == 0)
return WV_TAG_LI;
if (len == 2 && strncmp(name, "ul", 2) == 0)
return WV_TAG_UL;
if (len == 2 && strncmp(name, "h1", 2) == 0)
return WV_TAG_H1;
return WV_TAG_UNKNOWN;
}
void wv_tokenizer_init(struct wv_tokenizer *t, const char *src,
size_t len)
{
t->src = src;
t->len = len;
t->pos = 0;
t->state = WV_STATE_DATA;
t->quote_char = '\0';
}
struct wv_token wv_tokenizer_next(struct wv_tokenizer *t)
{
struct wv_token tok = {WV_TOK_EOF, NULL, 0};
if (t->pos >= t->len)
return tok;
switch (t->state) {
case WV_STATE_DATA:
if (t->src[t->pos] == '<') {
t->pos++;
skip_whitespace(t);
if (t->pos < t->len && t->src[t->pos] == '/') {
t->pos++;
tok.type = WV_TOK_TAG_CLOSE;
} else {
tok.type = WV_TOK_TAG_OPEN;
}
tok.start = &t->src[t->pos];
while (t->pos < t->len && !is_delim(t->src[t->pos]))
t->pos++;
tok.len = &t->src[t->pos] - tok.start;
t->state = WV_STATE_TAG;
return tok;
}
/* Extract text until the next tag starts */
tok.type = WV_TOK_TEXT;
tok.start = &t->src[t->pos];
while (t->pos < t->len && t->src[t->pos] != '<')
t->pos++;
tok.len = &t->src[t->pos] - tok.start;
return tok;
case WV_STATE_TAG:
skip_whitespace(t);
if (t->pos >= t->len)
return tok;
/* End of tag or self-closing tag */
if (t->src[t->pos] == '>' || (t->src[t->pos] == '/' &&
t->pos + 1 < t->len && t->src[t->pos+1] == '>')) {
if (t->src[t->pos] == '/')
t->pos++;
t->pos++;
t->state = WV_STATE_DATA;
return wv_tokenizer_next(t);
}
/* Attribute Key */
tok.type = WV_TOK_ATTR_KEY;
tok.start = &t->src[t->pos];
while (t->pos < t->len && !is_delim(t->src[t->pos]))
t->pos++;
tok.len = &t->src[t->pos] - tok.start;
skip_whitespace(t);
if (t->pos < t->len && t->src[t->pos] == '=') {
t->pos++;
t->state = WV_STATE_ATTR_VAL;
}
return tok;
case WV_STATE_ATTR_VAL:
skip_whitespace(t);
if (t->pos < t->len && (t->src[t->pos] == '"' ||
t->src[t->pos] == '\'')) {
t->quote_char = t->src[t->pos++];
tok.start = &t->src[t->pos];
while (t->pos < t->len && t->src[t->pos] != t->quote_char)
t->pos++;
tok.len = &t->src[t->pos] - tok.start;
if (t->pos < t->len) t->pos++;
} else {
tok.start = &t->src[t->pos];
while (t->pos < t->len && !isspace(t->src[t->pos]) &&
t->src[t->pos] != '>')
t->pos++;
tok.len = &t->src[t->pos] - tok.start;
}
tok.type = WV_TOK_ATTR_VAL;
t->state = WV_STATE_TAG;
return tok;
}
return tok;
}
wv_ref wv_parse_document(struct wv_arena *arena, const char *src)
{
struct wv_parser p;
struct wv_token tok;
wv_ref root = 0;
wv_ref last_el = 0;
wv_tokenizer_init(&p.tokenizer, src, strlen(src));
p.arena = arena;
wv_vec_init(&p.stack, sizeof(wv_ref));
while ((tok = wv_tokenizer_next(&p.tokenizer)).type != WV_TOK_EOF) {
switch (tok.type) {
case WV_TOK_TAG_OPEN: {
wv_ref new_node = wv_node_new(p.arena, WV_NODE_ELEMENT);
struct wv_node *n = (struct wv_node *)WV_ADDR(p.arena, new_node);
n->u.element.tag_id = map_tag_name(tok.start, tok.len);
/* Determine parent: either top of stack or this is the root */
wv_ref *parent = (wv_ref *)wv_vec_last(&p.stack);
if (parent)
wv_node_append(p.arena, *parent, new_node);
else if (root == 0)
root = new_node;
wv_vec_push(&p.stack, &new_node);
last_el = new_node; /* Store for potential attribute keys */
break;
}
case WV_TOK_TAG_CLOSE:
wv_vec_pop(&p.stack);
break;
case WV_TOK_ATTR_KEY: {
/* Next token MUST be ATTR_VAL if state changed */
struct wv_token val_tok = wv_tokenizer_next(&p.tokenizer);
if (val_tok.type == WV_TOK_ATTR_VAL && last_el != 0) {
wv_ref k = wv_arena_push_string(p.arena, tok.start, tok.len);
wv_ref v = wv_arena_push_string(p.arena, val_tok.start, val_tok.len);
wv_attr_set(p.arena, last_el, k, v);
}
break;
}
case WV_TOK_TEXT: {
wv_ref *parent = (wv_ref *)wv_vec_last(&p.stack);
if (!parent)
break;
wv_ref txt_node = wv_node_new(p.arena, WV_NODE_TEXT);
struct wv_node *n = (struct wv_node *)WV_ADDR(p.arena, txt_node);
n->u.text.str = wv_arena_push_string(p.arena, tok.start, tok.len);
n->u.text.len = tok.len;
wv_node_append(p.arena, *parent, txt_node);
break;
}
default: break;
}
}
wv_vec_free(&p.stack);
return root;
}
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