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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "config.h"
#include "cmark.h"
#include "node.h"
#include "buffer.h"
#include "houdini.h"
// Functions to convert cmark_nodes to HTML strings.
static void escape_html(strbuf *dest, const unsigned char *source, int length)
{
if (length < 0)
length = strlen((char *)source);
houdini_escape_html0(dest, source, (size_t)length, 0);
}
static void escape_href(strbuf *dest, const unsigned char *source, int length)
{
if (length < 0)
length = strlen((char *)source);
houdini_escape_href(dest, source, (size_t)length);
}
static inline void cr(strbuf *html)
{
if (html->size && html->ptr[html->size - 1] != '\n')
strbuf_putc(html, '\n');
}
struct render_state {
strbuf* html;
cmark_node *plain;
};
static int
S_render_node(cmark_node *node, cmark_event_type ev_type, void *vstate)
{
struct render_state *state = vstate;
cmark_node *parent;
cmark_node *grandparent;
strbuf *html = state->html;
char start_header[] = "<h0>";
char end_header[] = "</h0>";
bool tight;
bool entering = (ev_type == CMARK_EVENT_ENTER);
if (state->plain == node) { // back at original node
state->plain = NULL;
}
if (state->plain != NULL) {
switch(node->type) {
case CMARK_NODE_TEXT:
case CMARK_NODE_CODE:
case CMARK_NODE_INLINE_HTML:
escape_html(html, node->as.literal.data,
node->as.literal.len);
break;
case CMARK_NODE_LINEBREAK:
case CMARK_NODE_SOFTBREAK:
strbuf_putc(html, ' ');
break;
default:
break;
}
return 1;
}
switch (node->type) {
case CMARK_NODE_DOCUMENT:
break;
case CMARK_NODE_BLOCK_QUOTE:
if (entering) {
cr(html);
strbuf_puts(html, "<blockquote>\n");
} else {
cr(html);
strbuf_puts(html, "</blockquote>\n");
}
break;
case CMARK_NODE_LIST: {
cmark_list_type list_type = node->as.list.list_type;
int start = node->as.list.start;
if (entering) {
cr(html);
if (list_type == CMARK_BULLET_LIST) {
strbuf_puts(html, "<ul>\n");
}
else if (start == 1) {
strbuf_puts(html, "<ol>\n");
}
else {
strbuf_printf(html, "<ol start=\"%d\">\n",
start);
}
} else {
strbuf_puts(html,
list_type == CMARK_BULLET_LIST ?
"</ul>\n" : "</ol>\n");
}
break;
}
case CMARK_NODE_LIST_ITEM:
if (entering) {
cr(html);
strbuf_puts(html, "<li>");
} else {
strbuf_puts(html, "</li>\n");
}
break;
case CMARK_NODE_HEADER:
if (entering) {
cr(html);
start_header[2] = '0' + node->as.header.level;
strbuf_puts(html, start_header);
} else {
end_header[3] = '0' + node->as.header.level;
strbuf_puts(html, end_header);
strbuf_putc(html, '\n');
}
break;
case CMARK_NODE_CODE_BLOCK:
cr(html);
if (&node->as.code.fence_length == 0
|| node->as.code.info.len == 0) {
strbuf_puts(html, "<pre><code>");
}
else {
int first_tag = 0;
while (first_tag < node->as.code.info.len &&
node->as.code.info.data[first_tag] != ' ') {
first_tag += 1;
}
strbuf_puts(html, "<pre><code class=\"language-");
escape_html(html, node->as.code.info.data, first_tag);
strbuf_puts(html, "\">");
}
escape_html(html, node->as.literal.data, node->as.literal.len);
strbuf_puts(html, "</code></pre>\n");
break;
case CMARK_NODE_HTML:
cr(html);
strbuf_put(html, node->as.literal.data, node->as.literal.len);
break;
case CMARK_NODE_HRULE:
cr(html);
strbuf_puts(html, "<hr />\n");
break;
case CMARK_NODE_PARAGRAPH:
parent = cmark_node_parent(node);
grandparent = cmark_node_parent(parent);
if (grandparent != NULL &&
grandparent->type == CMARK_NODE_LIST) {
tight = grandparent->as.list.tight;
} else {
tight = false;
}
if (!tight) {
if (entering) {
cr(html);
strbuf_puts(html, "<p>");
} else {
strbuf_puts(html, "</p>\n");
}
}
break;
case CMARK_NODE_TEXT:
escape_html(html, node->as.literal.data,
node->as.literal.len);
break;
case CMARK_NODE_LINEBREAK:
strbuf_puts(html, "<br />\n");
break;
case CMARK_NODE_SOFTBREAK:
strbuf_putc(html, '\n');
break;
case CMARK_NODE_CODE:
strbuf_puts(html, "<code>");
escape_html(html, node->as.literal.data, node->as.literal.len);
strbuf_puts(html, "</code>");
break;
case CMARK_NODE_INLINE_HTML:
strbuf_put(html, node->as.literal.data, node->as.literal.len);
break;
case CMARK_NODE_STRONG:
if (entering) {
strbuf_puts(html, "<strong>");
} else {
strbuf_puts(html, "</strong>");
}
break;
case CMARK_NODE_EMPH:
if (entering) {
strbuf_puts(html, "<em>");
} else {
strbuf_puts(html, "</em>");
}
break;
case CMARK_NODE_LINK:
if (entering) {
strbuf_puts(html, "<a href=\"");
if (node->as.link.url)
escape_href(html, node->as.link.url, -1);
if (node->as.link.title) {
strbuf_puts(html, "\" title=\"");
escape_html(html, node->as.link.title, -1);
}
strbuf_puts(html, "\">");
} else {
strbuf_puts(html, "</a>");
}
break;
case CMARK_NODE_IMAGE:
if (entering) {
strbuf_puts(html, "<img src=\"");
if (node->as.link.url)
escape_href(html, node->as.link.url, -1);
strbuf_puts(html, "\" alt=\"");
state->plain = node;
} else {
if (node->as.link.title) {
strbuf_puts(html, "\" title=\"");
escape_html(html, node->as.link.title, -1);
}
strbuf_puts(html, "\" />");
}
break;
default:
assert(false);
break;
}
// strbuf_putc(html, 'x');
return 1;
}
char *cmark_render_html(cmark_node *root)
{
char *result;
strbuf html = GH_BUF_INIT;
cmark_event_type ev_type;
cmark_node *cur;
struct render_state state = { &html, NULL };
cmark_iter *iter = cmark_iter_new(root);
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
cur = cmark_iter_get_node(iter);
S_render_node(cur, ev_type, &state);
}
result = (char *)strbuf_detach(&html);
cmark_iter_free(iter);
strbuf_free(&html);
return result;
}
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