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-rw-r--r--src/html.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/src/html.c b/src/html.c
new file mode 100644
index 0000000..60229cc
--- /dev/null
+++ b/src/html.c
@@ -0,0 +1,357 @@
+#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 bool
+finish_node(strbuf *html, cmark_node *node, bool tight);
+
+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');
+}
+
+// Convert the inline children of a node to a plain string.
+static void inlines_to_plain_html(strbuf *html, cmark_node* node)
+{
+ cmark_node* cur = node->first_child;
+
+ if (cur == NULL) {
+ return;
+ }
+
+ while (true) {
+ switch(cur->type) {
+ case NODE_TEXT:
+ case NODE_INLINE_CODE:
+ case NODE_INLINE_HTML:
+ escape_html(html, cur->as.literal.data, cur->as.literal.len);
+ break;
+
+ case NODE_LINEBREAK:
+ case NODE_SOFTBREAK:
+ strbuf_putc(html, ' ');
+ break;
+
+ default:
+ break;
+ }
+
+ if (cur->first_child) {
+ cur = cur->first_child;
+ continue;
+ }
+
+ next_sibling:
+ if (cur->next) {
+ cur = cur->next;
+ continue;
+ }
+ cur = cur->parent;
+ if (cur == node) {
+ break;
+ }
+ goto next_sibling;
+ }
+}
+
+
+// Convert a cmark_node to HTML.
+static void node_to_html(strbuf *html, cmark_node *node)
+{
+ cmark_node *cur;
+ char start_header[] = "<h0>";
+ bool tight = false;
+ bool visit_children;
+ strbuf *info;
+
+ if (node == NULL) {
+ return;
+ }
+
+ cur = node;
+ while (true) {
+ // Only NODE_IMAGE wants to skip its children.
+ visit_children = true;
+
+ switch(cur->type) {
+ case NODE_DOCUMENT:
+ break;
+
+ case NODE_PARAGRAPH:
+ if (!tight) {
+ cr(html);
+ strbuf_puts(html, "<p>");
+ }
+ break;
+
+ case NODE_BLOCK_QUOTE:
+ cr(html);
+ strbuf_puts(html, "<blockquote>\n");
+ // BLOCK_QUOTE doesn't use any of the 'as' structs,
+ // so the 'list' member can be used to store the
+ // current value of 'tight'.
+ cur->as.list.tight = tight;
+ tight = false;
+ break;
+
+ case NODE_LIST_ITEM:
+ cr(html);
+ strbuf_puts(html, "<li>");
+ break;
+
+ case NODE_LIST: {
+ cmark_list *list = &cur->as.list;
+ bool tmp;
+
+ // make sure a list starts at the beginning of the line:
+ cr(html);
+
+ if (list->list_type == CMARK_BULLET_LIST) {
+ strbuf_puts(html, "<ul>\n");
+ }
+ else if (list->start == 1) {
+ strbuf_puts(html, "<ol>\n");
+ }
+ else {
+ strbuf_printf(html, "<ol start=\"%d\">\n",
+ list->start);
+ }
+
+ // Store the current value of 'tight' by swapping.
+ tmp = list->tight;
+ list->tight = tight;
+ tight = tmp;
+ break;
+ }
+
+ case NODE_HEADER:
+ cr(html);
+ start_header[2] = '0' + cur->as.header.level;
+ strbuf_puts(html, start_header);
+ break;
+
+ case NODE_CODE_BLOCK:
+ info = &cur->as.code.info;
+ cr(html);
+
+ if (&cur->as.code.fence_length == 0
+ || strbuf_len(info) == 0) {
+ strbuf_puts(html, "<pre><code>");
+ }
+ else {
+ int first_tag = strbuf_strchr(info, ' ', 0);
+ if (first_tag < 0)
+ first_tag = strbuf_len(info);
+
+ strbuf_puts(html,
+ "<pre><code class=\"language-");
+ escape_html(html, info->ptr, first_tag);
+ strbuf_puts(html, "\">");
+ }
+
+ escape_html(html, cur->string_content.ptr, cur->string_content.size);
+ break;
+
+ case NODE_HTML:
+ cr(html);
+ strbuf_put(html, cur->string_content.ptr, cur->string_content.size);
+ break;
+
+ case NODE_HRULE:
+ cr(html);
+ strbuf_puts(html, "<hr />\n");
+ break;
+
+ case NODE_REFERENCE_DEF:
+ break;
+
+ case NODE_TEXT:
+ escape_html(html, cur->as.literal.data, cur->as.literal.len);
+ break;
+
+ case NODE_LINEBREAK:
+ strbuf_puts(html, "<br />\n");
+ break;
+
+ case NODE_SOFTBREAK:
+ strbuf_putc(html, '\n');
+ break;
+
+ case NODE_INLINE_CODE:
+ strbuf_puts(html, "<code>");
+ escape_html(html, cur->as.literal.data, cur->as.literal.len);
+ break;
+
+ case NODE_INLINE_HTML:
+ strbuf_put(html,
+ cur->as.literal.data,
+ cur->as.literal.len);
+ break;
+
+ case NODE_LINK:
+ strbuf_puts(html, "<a href=\"");
+ if (cur->as.link.url)
+ escape_href(html, cur->as.link.url, -1);
+
+ if (cur->as.link.title) {
+ strbuf_puts(html, "\" title=\"");
+ escape_html(html, cur->as.link.title, -1);
+ }
+
+ strbuf_puts(html, "\">");
+ break;
+
+ case NODE_IMAGE:
+ strbuf_puts(html, "<img src=\"");
+ if (cur->as.link.url)
+ escape_href(html, cur->as.link.url, -1);
+
+ strbuf_puts(html, "\" alt=\"");
+ inlines_to_plain_html(html, cur);
+
+ if (cur->as.link.title) {
+ strbuf_puts(html, "\" title=\"");
+ escape_html(html, cur->as.link.title, -1);
+ }
+
+ strbuf_puts(html, "\" />");
+ visit_children = false;
+ break;
+
+ case NODE_STRONG:
+ strbuf_puts(html, "<strong>");
+ break;
+
+ case NODE_EMPH:
+ strbuf_puts(html, "<em>");
+ break;
+
+ default:
+ assert(false);
+ }
+
+ if (visit_children && cur->first_child) {
+ cur = cur->first_child;
+ continue;
+ }
+
+ next_sibling:
+ tight = finish_node(html, cur, tight);
+ if (cur == node) {
+ break;
+ }
+ if (cur->next) {
+ cur = cur->next;
+ continue;
+ }
+ cur = cur->parent;
+ goto next_sibling;
+ }
+}
+
+// Returns the restored value of 'tight'.
+static bool
+finish_node(strbuf *html, cmark_node *node, bool tight)
+{
+ char end_header[] = "</h0>\n";
+
+ switch (node->type) {
+ case NODE_PARAGRAPH:
+ if (!tight) {
+ strbuf_puts(html, "</p>\n");
+ }
+ break;
+
+ case NODE_BLOCK_QUOTE: {
+ cmark_list *list = &node->as.list;
+ strbuf_puts(html, "</blockquote>\n");
+ // Restore old 'tight' value.
+ tight = list->tight;
+ list->tight = false;
+ break;
+ }
+
+ case NODE_LIST_ITEM:
+ strbuf_puts(html, "</li>\n");
+ break;
+
+ case NODE_LIST: {
+ cmark_list *list = &node->as.list;
+ bool tmp;
+ strbuf_puts(html,
+ list->list_type == CMARK_BULLET_LIST ?
+ "</ul>\n" : "</ol>\n");
+ // Restore old 'tight' value.
+ tmp = tight;
+ tight = list->tight;
+ list->tight = tmp;
+ break;
+ }
+
+ case NODE_HEADER:
+ end_header[3] = '0' + node->as.header.level;
+ strbuf_puts(html, end_header);
+ break;
+
+ case NODE_CODE_BLOCK:
+ strbuf_puts(html, "</code></pre>\n");
+ break;
+
+ case NODE_INLINE_CODE:
+ strbuf_puts(html, "</code>");
+ break;
+
+ case NODE_LINK:
+ strbuf_puts(html, "</a>");
+ break;
+
+ case NODE_STRONG:
+ strbuf_puts(html, "</strong>");
+ break;
+
+ case NODE_EMPH:
+ strbuf_puts(html, "</em>");
+ break;
+
+ default:
+ break;
+ }
+
+ return tight;
+}
+
+char *cmark_render_html(cmark_node *root)
+{
+ char *result;
+ strbuf html = GH_BUF_INIT;
+ node_to_html(&html, root);
+ result = (char *)strbuf_detach(&html);
+ strbuf_free(&html);
+ return result;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-20 07:21:20 +0000