summaryrefslogtreecommitdiff
path: root/cmark/src/html.c
diff options
context:
space:
mode:
Diffstat (limited to 'cmark/src/html.c')
-rw-r--r--cmark/src/html.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/cmark/src/html.c b/cmark/src/html.c
new file mode 100644
index 0000000000..5c14fa6f89
--- /dev/null
+++ b/cmark/src/html.c
@@ -0,0 +1,345 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "cmark_ctype.h"
+#include "cmark.h"
+#include "node.h"
+#include "buffer.h"
+#include "houdini.h"
+#include "scanners.h"
+
+#define BUFFER_SIZE 100
+
+// Functions to convert cmark_nodes to HTML strings.
+
+static void escape_html(cmark_strbuf *dest, const unsigned char *source,
+ bufsize_t length) {
+ houdini_escape_html(dest, source, length, 0);
+}
+
+static inline void cr(cmark_strbuf *html) {
+ if (html->size && html->ptr[html->size - 1] != '\n')
+ cmark_strbuf_putc(html, '\n');
+}
+
+struct render_state {
+ cmark_strbuf *html;
+ cmark_node *plain;
+};
+
+static void S_render_sourcepos(cmark_node *node, cmark_strbuf *html,
+ int options) {
+ char buffer[BUFFER_SIZE];
+ if (CMARK_OPT_SOURCEPOS & options) {
+ snprintf(buffer, BUFFER_SIZE, " data-sourcepos=\"%d:%d-%d:%d\"",
+ cmark_node_get_start_line(node), cmark_node_get_start_column(node),
+ cmark_node_get_end_line(node), cmark_node_get_end_column(node));
+ cmark_strbuf_puts(html, buffer);
+ }
+}
+
+static int S_render_node(cmark_node *node, cmark_event_type ev_type,
+ struct render_state *state, int options) {
+ cmark_node *parent;
+ cmark_node *grandparent;
+ cmark_strbuf *html = state->html;
+ char start_heading[] = "<h0";
+ char end_heading[] = "</h0";
+ bool tight;
+ char buffer[BUFFER_SIZE];
+
+ 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_HTML_INLINE:
+ escape_html(html, node->data, node->len);
+ break;
+
+ case CMARK_NODE_LINEBREAK:
+ case CMARK_NODE_SOFTBREAK:
+ cmark_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);
+ cmark_strbuf_puts(html, "<blockquote");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, ">\n");
+ } else {
+ cr(html);
+ cmark_strbuf_puts(html, "</blockquote>\n");
+ }
+ break;
+
+ case CMARK_NODE_LIST: {
+ cmark_list_type list_type = (cmark_list_type)node->as.list.list_type;
+ int start = node->as.list.start;
+
+ if (entering) {
+ cr(html);
+ if (list_type == CMARK_BULLET_LIST) {
+ cmark_strbuf_puts(html, "<ul");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, ">\n");
+ } else if (start == 1) {
+ cmark_strbuf_puts(html, "<ol");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, ">\n");
+ } else {
+ snprintf(buffer, BUFFER_SIZE, "<ol start=\"%d\"", start);
+ cmark_strbuf_puts(html, buffer);
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, ">\n");
+ }
+ } else {
+ cmark_strbuf_puts(html,
+ list_type == CMARK_BULLET_LIST ? "</ul>\n" : "</ol>\n");
+ }
+ break;
+ }
+
+ case CMARK_NODE_ITEM:
+ if (entering) {
+ cr(html);
+ cmark_strbuf_puts(html, "<li");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_putc(html, '>');
+ } else {
+ cmark_strbuf_puts(html, "</li>\n");
+ }
+ break;
+
+ case CMARK_NODE_HEADING:
+ if (entering) {
+ cr(html);
+ start_heading[2] = (char)('0' + node->as.heading.level);
+ cmark_strbuf_puts(html, start_heading);
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_putc(html, '>');
+ } else {
+ end_heading[3] = (char)('0' + node->as.heading.level);
+ cmark_strbuf_puts(html, end_heading);
+ cmark_strbuf_puts(html, ">\n");
+ }
+ break;
+
+ case CMARK_NODE_CODE_BLOCK:
+ cr(html);
+
+ if (node->as.code.info == NULL || node->as.code.info[0] == 0) {
+ cmark_strbuf_puts(html, "<pre");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, "><code>");
+ } else {
+ bufsize_t first_tag = 0;
+ while (node->as.code.info[first_tag] &&
+ !cmark_isspace(node->as.code.info[first_tag])) {
+ first_tag += 1;
+ }
+
+ cmark_strbuf_puts(html, "<pre");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, "><code class=\"");
+ if (strncmp((char *)node->as.code.info, "language-", 9) != 0) {
+ cmark_strbuf_puts(html, "language-");
+ }
+ escape_html(html, node->as.code.info, first_tag);
+ cmark_strbuf_puts(html, "\">");
+ }
+
+ escape_html(html, node->data, node->len);
+ cmark_strbuf_puts(html, "</code></pre>\n");
+ break;
+
+ case CMARK_NODE_HTML_BLOCK:
+ cr(html);
+ if (!(options & CMARK_OPT_UNSAFE)) {
+ cmark_strbuf_puts(html, "<!-- raw HTML omitted -->");
+ } else {
+ cmark_strbuf_put(html, node->data, node->len);
+ }
+ cr(html);
+ break;
+
+ case CMARK_NODE_CUSTOM_BLOCK: {
+ unsigned char *block = entering ? node->as.custom.on_enter :
+ node->as.custom.on_exit;
+ cr(html);
+ if (block) {
+ cmark_strbuf_puts(html, (char *)block);
+ }
+ cr(html);
+ break;
+ }
+
+ case CMARK_NODE_THEMATIC_BREAK:
+ cr(html);
+ cmark_strbuf_puts(html, "<hr");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_puts(html, " />\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);
+ cmark_strbuf_puts(html, "<p");
+ S_render_sourcepos(node, html, options);
+ cmark_strbuf_putc(html, '>');
+ } else {
+ cmark_strbuf_puts(html, "</p>\n");
+ }
+ }
+ break;
+
+ case CMARK_NODE_TEXT:
+ escape_html(html, node->data, node->len);
+ break;
+
+ case CMARK_NODE_LINEBREAK:
+ cmark_strbuf_puts(html, "<br />\n");
+ break;
+
+ case CMARK_NODE_SOFTBREAK:
+ if (options & CMARK_OPT_HARDBREAKS) {
+ cmark_strbuf_puts(html, "<br />\n");
+ } else if (options & CMARK_OPT_NOBREAKS) {
+ cmark_strbuf_putc(html, ' ');
+ } else {
+ cmark_strbuf_putc(html, '\n');
+ }
+ break;
+
+ case CMARK_NODE_CODE:
+ cmark_strbuf_puts(html, "<code>");
+ escape_html(html, node->data, node->len);
+ cmark_strbuf_puts(html, "</code>");
+ break;
+
+ case CMARK_NODE_HTML_INLINE:
+ if (!(options & CMARK_OPT_UNSAFE)) {
+ cmark_strbuf_puts(html, "<!-- raw HTML omitted -->");
+ } else {
+ cmark_strbuf_put(html, node->data, node->len);
+ }
+ break;
+
+ case CMARK_NODE_CUSTOM_INLINE: {
+ unsigned char *block = entering ? node->as.custom.on_enter :
+ node->as.custom.on_exit;
+ if (block) {
+ cmark_strbuf_puts(html, (char *)block);
+ }
+ break;
+ }
+
+ case CMARK_NODE_STRONG:
+ if (entering) {
+ cmark_strbuf_puts(html, "<strong>");
+ } else {
+ cmark_strbuf_puts(html, "</strong>");
+ }
+ break;
+
+ case CMARK_NODE_EMPH:
+ if (entering) {
+ cmark_strbuf_puts(html, "<em>");
+ } else {
+ cmark_strbuf_puts(html, "</em>");
+ }
+ break;
+
+ case CMARK_NODE_LINK:
+ if (entering) {
+ cmark_strbuf_puts(html, "<a href=\"");
+ if (node->as.link.url && ((options & CMARK_OPT_UNSAFE) ||
+ !(_scan_dangerous_url(node->as.link.url)))) {
+ houdini_escape_href(html, node->as.link.url,
+ (bufsize_t)strlen((char *)node->as.link.url));
+ }
+ if (node->as.link.title) {
+ cmark_strbuf_puts(html, "\" title=\"");
+ escape_html(html, node->as.link.title,
+ (bufsize_t)strlen((char *)node->as.link.title));
+ }
+ cmark_strbuf_puts(html, "\">");
+ } else {
+ cmark_strbuf_puts(html, "</a>");
+ }
+ break;
+
+ case CMARK_NODE_IMAGE:
+ if (entering) {
+ cmark_strbuf_puts(html, "<img src=\"");
+ if (node->as.link.url && ((options & CMARK_OPT_UNSAFE) ||
+ !(_scan_dangerous_url(node->as.link.url)))) {
+ houdini_escape_href(html, node->as.link.url,
+ (bufsize_t)strlen((char *)node->as.link.url));
+ }
+ cmark_strbuf_puts(html, "\" alt=\"");
+ state->plain = node;
+ } else {
+ if (node->as.link.title) {
+ cmark_strbuf_puts(html, "\" title=\"");
+ escape_html(html, node->as.link.title,
+ (bufsize_t)strlen((char *)node->as.link.title));
+ }
+
+ cmark_strbuf_puts(html, "\" />");
+ }
+ break;
+
+ default:
+ assert(false);
+ break;
+ }
+
+ // cmark_strbuf_putc(html, 'x');
+ return 1;
+}
+
+char *cmark_render_html(cmark_node *root, int options) {
+ char *result;
+ cmark_strbuf html = CMARK_BUF_INIT(root->mem);
+ 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, options);
+ }
+ result = (char *)cmark_strbuf_detach(&html);
+
+ cmark_iter_free(iter);
+ return result;
+}
generated by cgit 0.0.5-2-1-g0f52 (git 2.46.0) at 2026-04-05 18:50:19 +0000