503 lines
15 KiB
C
503 lines
15 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "cmark_ctype.h"
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#include "config.h"
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#include "cmark-gfm.h"
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#include "houdini.h"
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#include "scanners.h"
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#include "syntax_extension.h"
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#include "html.h"
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#include "render.h"
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// Functions to convert cmark_nodes to HTML strings.
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static void escape_html(cmark_strbuf *dest, const unsigned char *source,
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bufsize_t length) {
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houdini_escape_html0(dest, source, length, 0);
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}
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static void filter_html_block(cmark_html_renderer *renderer, uint8_t *data, size_t len) {
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cmark_strbuf *html = renderer->html;
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cmark_llist *it;
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cmark_syntax_extension *ext;
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bool filtered;
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uint8_t *match;
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while (len) {
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match = (uint8_t *) memchr(data, '<', len);
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if (!match)
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break;
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if (match != data) {
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cmark_strbuf_put(html, data, (bufsize_t)(match - data));
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len -= (match - data);
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data = match;
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}
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filtered = false;
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for (it = renderer->filter_extensions; it; it = it->next) {
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ext = ((cmark_syntax_extension *) it->data);
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if (!ext->html_filter_func(ext, data, len)) {
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filtered = true;
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break;
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}
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}
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if (!filtered) {
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cmark_strbuf_putc(html, '<');
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} else {
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cmark_strbuf_puts(html, "<");
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}
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++data;
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--len;
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}
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if (len)
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cmark_strbuf_put(html, data, (bufsize_t)len);
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}
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static bool S_put_footnote_backref(cmark_html_renderer *renderer, cmark_strbuf *html, cmark_node *node) {
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if (renderer->written_footnote_ix >= renderer->footnote_ix)
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return false;
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renderer->written_footnote_ix = renderer->footnote_ix;
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char m[32];
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snprintf(m, sizeof(m), "%d", renderer->written_footnote_ix);
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cmark_strbuf_puts(html, "<a href=\"#fnref-");
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houdini_escape_href(html, node->as.literal.data, node->as.literal.len);
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cmark_strbuf_puts(html, "\" class=\"footnote-backref\" data-footnote-backref data-footnote-backref-idx=\"");
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cmark_strbuf_puts(html, m);
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cmark_strbuf_puts(html, "\" aria-label=\"Back to reference ");
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cmark_strbuf_puts(html, m);
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cmark_strbuf_puts(html, "\">↩</a>");
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if (node->footnote.def_count > 1)
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{
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for(int i = 2; i <= node->footnote.def_count; i++) {
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char n[32];
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snprintf(n, sizeof(n), "%d", i);
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cmark_strbuf_puts(html, " <a href=\"#fnref-");
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houdini_escape_href(html, node->as.literal.data, node->as.literal.len);
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cmark_strbuf_puts(html, "-");
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cmark_strbuf_puts(html, n);
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cmark_strbuf_puts(html, "\" class=\"footnote-backref\" data-footnote-backref data-footnote-backref-idx=\"");
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cmark_strbuf_puts(html, m);
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cmark_strbuf_puts(html, "-");
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cmark_strbuf_puts(html, n);
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cmark_strbuf_puts(html, "\" aria-label=\"Back to reference ");
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cmark_strbuf_puts(html, m);
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cmark_strbuf_puts(html, "-");
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cmark_strbuf_puts(html, n);
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cmark_strbuf_puts(html, "\">↩<sup class=\"footnote-ref\">");
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cmark_strbuf_puts(html, n);
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cmark_strbuf_puts(html, "</sup></a>");
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}
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}
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return true;
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}
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static int S_render_node(cmark_html_renderer *renderer, cmark_node *node,
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cmark_event_type ev_type, int options) {
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cmark_node *parent;
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cmark_node *grandparent;
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cmark_strbuf *html = renderer->html;
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cmark_llist *it;
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cmark_syntax_extension *ext;
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char start_heading[] = "<h0";
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char end_heading[] = "</h0";
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bool tight;
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bool filtered;
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char buffer[BUFFER_SIZE];
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bool entering = (ev_type == CMARK_EVENT_ENTER);
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if (renderer->plain == node) { // back at original node
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renderer->plain = NULL;
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}
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if (renderer->plain != NULL) {
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switch (node->type) {
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case CMARK_NODE_TEXT:
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case CMARK_NODE_CODE:
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case CMARK_NODE_HTML_INLINE:
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escape_html(html, node->as.literal.data, node->as.literal.len);
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break;
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case CMARK_NODE_LINEBREAK:
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case CMARK_NODE_SOFTBREAK:
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cmark_strbuf_putc(html, ' ');
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break;
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default:
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break;
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}
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return 1;
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}
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if (node->extension && node->extension->html_render_func) {
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node->extension->html_render_func(node->extension, renderer, node, ev_type, options);
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return 1;
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}
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switch (node->type) {
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case CMARK_NODE_DOCUMENT:
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break;
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case CMARK_NODE_BLOCK_QUOTE:
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if (entering) {
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cmark_html_render_cr(html);
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cmark_strbuf_puts(html, "<blockquote");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, ">\n");
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} else {
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cmark_html_render_cr(html);
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cmark_strbuf_puts(html, "</blockquote>\n");
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}
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break;
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case CMARK_NODE_LIST: {
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cmark_list_type list_type = node->as.list.list_type;
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int start = node->as.list.start;
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if (entering) {
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cmark_html_render_cr(html);
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if (list_type == CMARK_BULLET_LIST) {
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cmark_strbuf_puts(html, "<ul");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, ">\n");
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} else if (start == 1) {
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cmark_strbuf_puts(html, "<ol");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, ">\n");
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} else {
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snprintf(buffer, BUFFER_SIZE, "<ol start=\"%d\"", start);
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cmark_strbuf_puts(html, buffer);
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, ">\n");
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}
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} else {
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cmark_strbuf_puts(html,
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list_type == CMARK_BULLET_LIST ? "</ul>\n" : "</ol>\n");
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}
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break;
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}
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case CMARK_NODE_ITEM:
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if (entering) {
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cmark_html_render_cr(html);
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cmark_strbuf_puts(html, "<li");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_putc(html, '>');
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} else {
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cmark_strbuf_puts(html, "</li>\n");
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}
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break;
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case CMARK_NODE_HEADING:
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if (entering) {
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cmark_html_render_cr(html);
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start_heading[2] = (char)('0' + node->as.heading.level);
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cmark_strbuf_puts(html, start_heading);
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_putc(html, '>');
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} else {
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end_heading[3] = (char)('0' + node->as.heading.level);
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cmark_strbuf_puts(html, end_heading);
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cmark_strbuf_puts(html, ">\n");
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}
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break;
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case CMARK_NODE_CODE_BLOCK:
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cmark_html_render_cr(html);
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if (node->as.code.info.len == 0) {
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cmark_strbuf_puts(html, "<pre");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, "><code>");
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} else {
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bufsize_t first_tag = 0;
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while (first_tag < node->as.code.info.len &&
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!cmark_isspace(node->as.code.info.data[first_tag])) {
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first_tag += 1;
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}
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if (options & CMARK_OPT_GITHUB_PRE_LANG) {
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cmark_strbuf_puts(html, "<pre");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, " lang=\"");
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escape_html(html, node->as.code.info.data, first_tag);
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if (first_tag < node->as.code.info.len && (options & CMARK_OPT_FULL_INFO_STRING)) {
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cmark_strbuf_puts(html, "\" data-meta=\"");
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escape_html(html, node->as.code.info.data + first_tag + 1, node->as.code.info.len - first_tag - 1);
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}
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cmark_strbuf_puts(html, "\"><code>");
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} else {
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cmark_strbuf_puts(html, "<pre");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, "><code class=\"language-");
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escape_html(html, node->as.code.info.data, first_tag);
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if (first_tag < node->as.code.info.len && (options & CMARK_OPT_FULL_INFO_STRING)) {
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cmark_strbuf_puts(html, "\" data-meta=\"");
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escape_html(html, node->as.code.info.data + first_tag + 1, node->as.code.info.len - first_tag - 1);
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}
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cmark_strbuf_puts(html, "\">");
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}
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}
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escape_html(html, node->as.code.literal.data, node->as.code.literal.len);
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cmark_strbuf_puts(html, "</code></pre>\n");
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break;
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case CMARK_NODE_HTML_BLOCK:
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cmark_html_render_cr(html);
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if (!(options & CMARK_OPT_UNSAFE)) {
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cmark_strbuf_puts(html, "<!-- raw HTML omitted -->");
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} else if (renderer->filter_extensions) {
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filter_html_block(renderer, node->as.literal.data, node->as.literal.len);
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} else {
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cmark_strbuf_put(html, node->as.literal.data, node->as.literal.len);
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}
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cmark_html_render_cr(html);
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break;
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case CMARK_NODE_CUSTOM_BLOCK:
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cmark_html_render_cr(html);
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if (entering) {
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cmark_strbuf_put(html, node->as.custom.on_enter.data,
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node->as.custom.on_enter.len);
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} else {
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cmark_strbuf_put(html, node->as.custom.on_exit.data,
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node->as.custom.on_exit.len);
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}
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cmark_html_render_cr(html);
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break;
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case CMARK_NODE_THEMATIC_BREAK:
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cmark_html_render_cr(html);
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cmark_strbuf_puts(html, "<hr");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_puts(html, " />\n");
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break;
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case CMARK_NODE_PARAGRAPH:
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parent = cmark_node_parent(node);
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grandparent = cmark_node_parent(parent);
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if (grandparent != NULL && grandparent->type == CMARK_NODE_LIST) {
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tight = grandparent->as.list.tight;
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} else {
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tight = false;
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}
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if (!tight) {
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if (entering) {
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cmark_html_render_cr(html);
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cmark_strbuf_puts(html, "<p");
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cmark_html_render_sourcepos(node, html, options);
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cmark_strbuf_putc(html, '>');
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} else {
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if (parent->type == CMARK_NODE_FOOTNOTE_DEFINITION && node->next == NULL) {
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cmark_strbuf_putc(html, ' ');
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S_put_footnote_backref(renderer, html, parent);
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}
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cmark_strbuf_puts(html, "</p>\n");
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}
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}
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break;
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case CMARK_NODE_TEXT:
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escape_html(html, node->as.literal.data, node->as.literal.len);
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break;
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case CMARK_NODE_LINEBREAK:
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cmark_strbuf_puts(html, "<br />\n");
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break;
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case CMARK_NODE_SOFTBREAK:
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if (options & CMARK_OPT_HARDBREAKS) {
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cmark_strbuf_puts(html, "<br />\n");
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} else if (options & CMARK_OPT_NOBREAKS) {
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cmark_strbuf_putc(html, ' ');
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} else {
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cmark_strbuf_putc(html, '\n');
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}
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break;
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case CMARK_NODE_CODE:
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cmark_strbuf_puts(html, "<code>");
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escape_html(html, node->as.literal.data, node->as.literal.len);
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cmark_strbuf_puts(html, "</code>");
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break;
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case CMARK_NODE_HTML_INLINE:
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if (!(options & CMARK_OPT_UNSAFE)) {
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cmark_strbuf_puts(html, "<!-- raw HTML omitted -->");
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} else {
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filtered = false;
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for (it = renderer->filter_extensions; it; it = it->next) {
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ext = (cmark_syntax_extension *) it->data;
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if (!ext->html_filter_func(ext, node->as.literal.data, node->as.literal.len)) {
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filtered = true;
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break;
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}
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}
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if (!filtered) {
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cmark_strbuf_put(html, node->as.literal.data, node->as.literal.len);
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} else {
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cmark_strbuf_puts(html, "<");
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cmark_strbuf_put(html, node->as.literal.data + 1, node->as.literal.len - 1);
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}
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}
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break;
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case CMARK_NODE_CUSTOM_INLINE:
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if (entering) {
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cmark_strbuf_put(html, node->as.custom.on_enter.data,
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node->as.custom.on_enter.len);
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} else {
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cmark_strbuf_put(html, node->as.custom.on_exit.data,
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node->as.custom.on_exit.len);
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}
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break;
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case CMARK_NODE_STRONG:
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if (node->parent == NULL || node->parent->type != CMARK_NODE_STRONG) {
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if (entering) {
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cmark_strbuf_puts(html, "<strong>");
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} else {
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cmark_strbuf_puts(html, "</strong>");
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}
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}
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break;
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case CMARK_NODE_EMPH:
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if (entering) {
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cmark_strbuf_puts(html, "<em>");
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} else {
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cmark_strbuf_puts(html, "</em>");
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}
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break;
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case CMARK_NODE_LINK:
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if (entering) {
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cmark_strbuf_puts(html, "<a href=\"");
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if ((options & CMARK_OPT_UNSAFE) ||
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!(scan_dangerous_url(&node->as.link.url, 0))) {
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houdini_escape_href(html, node->as.link.url.data,
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node->as.link.url.len);
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}
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if (node->as.link.title.len) {
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cmark_strbuf_puts(html, "\" title=\"");
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escape_html(html, node->as.link.title.data, node->as.link.title.len);
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}
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cmark_strbuf_puts(html, "\">");
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} else {
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cmark_strbuf_puts(html, "</a>");
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}
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break;
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case CMARK_NODE_IMAGE:
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if (entering) {
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cmark_strbuf_puts(html, "<img src=\"");
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if ((options & CMARK_OPT_UNSAFE) ||
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!(scan_dangerous_url(&node->as.link.url, 0))) {
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houdini_escape_href(html, node->as.link.url.data,
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node->as.link.url.len);
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}
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cmark_strbuf_puts(html, "\" alt=\"");
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renderer->plain = node;
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} else {
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if (node->as.link.title.len) {
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cmark_strbuf_puts(html, "\" title=\"");
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escape_html(html, node->as.link.title.data, node->as.link.title.len);
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}
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cmark_strbuf_puts(html, "\" />");
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}
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break;
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case CMARK_NODE_FOOTNOTE_DEFINITION:
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if (entering) {
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if (renderer->footnote_ix == 0) {
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cmark_strbuf_puts(html, "<section class=\"footnotes\" data-footnotes>\n<ol>\n");
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}
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++renderer->footnote_ix;
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cmark_strbuf_puts(html, "<li id=\"fn-");
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houdini_escape_href(html, node->as.literal.data, node->as.literal.len);
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cmark_strbuf_puts(html, "\">\n");
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} else {
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if (S_put_footnote_backref(renderer, html, node)) {
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cmark_strbuf_putc(html, '\n');
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}
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cmark_strbuf_puts(html, "</li>\n");
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}
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break;
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case CMARK_NODE_FOOTNOTE_REFERENCE:
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if (entering) {
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cmark_strbuf_puts(html, "<sup class=\"footnote-ref\"><a href=\"#fn-");
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houdini_escape_href(html, node->parent_footnote_def->as.literal.data, node->parent_footnote_def->as.literal.len);
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cmark_strbuf_puts(html, "\" id=\"fnref-");
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houdini_escape_href(html, node->parent_footnote_def->as.literal.data, node->parent_footnote_def->as.literal.len);
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if (node->footnote.ref_ix > 1) {
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char n[32];
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snprintf(n, sizeof(n), "%d", node->footnote.ref_ix);
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cmark_strbuf_puts(html, "-");
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cmark_strbuf_puts(html, n);
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}
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cmark_strbuf_puts(html, "\" data-footnote-ref>");
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houdini_escape_href(html, node->as.literal.data, node->as.literal.len);
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cmark_strbuf_puts(html, "</a></sup>");
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}
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break;
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default:
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assert(false);
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break;
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}
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return 1;
|
|
}
|
|
|
|
char *cmark_render_html(cmark_node *root, int options, cmark_llist *extensions) {
|
|
return cmark_render_html_with_mem(root, options, extensions, cmark_node_mem(root));
|
|
}
|
|
|
|
char *cmark_render_html_with_mem(cmark_node *root, int options, cmark_llist *extensions, cmark_mem *mem) {
|
|
char *result;
|
|
cmark_strbuf html = CMARK_BUF_INIT(mem);
|
|
cmark_event_type ev_type;
|
|
cmark_node *cur;
|
|
cmark_html_renderer renderer = {&html, NULL, NULL, 0, 0, NULL};
|
|
cmark_iter *iter = cmark_iter_new(root);
|
|
|
|
for (; extensions; extensions = extensions->next)
|
|
if (((cmark_syntax_extension *) extensions->data)->html_filter_func)
|
|
renderer.filter_extensions = cmark_llist_append(
|
|
mem,
|
|
renderer.filter_extensions,
|
|
(cmark_syntax_extension *) extensions->data);
|
|
|
|
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
|
|
cur = cmark_iter_get_node(iter);
|
|
S_render_node(&renderer, cur, ev_type, options);
|
|
}
|
|
|
|
if (renderer.footnote_ix) {
|
|
cmark_strbuf_puts(&html, "</ol>\n</section>\n");
|
|
}
|
|
|
|
result = (char *)cmark_strbuf_detach(&html);
|
|
|
|
cmark_llist_free(mem, renderer.filter_extensions);
|
|
|
|
cmark_iter_free(iter);
|
|
return result;
|
|
}
|