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-rw-r--r--src/html/html.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/src/html/html.c b/src/html/html.c
new file mode 100644
index 0000000..6f3bc76
--- /dev/null
+++ b/src/html/html.c
@@ -0,0 +1,226 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+
+#include "stmd.h"
+#include "debug.h"
+#include "html/houdini.h"
+
+// Functions to convert node_block and inline lists 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');
+}
+
+// Convert an inline list to HTML. Returns 0 on success, and sets result.
+static void inlines_to_html(strbuf *html, node_inl* ils)
+{
+ strbuf scrap = GH_BUF_INIT;
+
+ while(ils != NULL) {
+ switch(ils->tag) {
+ case INL_STRING:
+ escape_html(html, ils->content.literal.data, ils->content.literal.len);
+ break;
+
+ case INL_LINEBREAK:
+ strbuf_puts(html, "<br />\n");
+ break;
+
+ case INL_SOFTBREAK:
+ strbuf_putc(html, '\n');
+ break;
+
+ case INL_CODE:
+ strbuf_puts(html, "<code>");
+ escape_html(html, ils->content.literal.data, ils->content.literal.len);
+ strbuf_puts(html, "</code>");
+ break;
+
+ case INL_RAW_HTML:
+ strbuf_put(html,
+ ils->content.literal.data,
+ ils->content.literal.len);
+ break;
+
+ case INL_LINK:
+ strbuf_puts(html, "<a href=\"");
+ if (ils->content.linkable.url)
+ escape_href(html, ils->content.linkable.url, -1);
+
+ if (ils->content.linkable.title) {
+ strbuf_puts(html, "\" title=\"");
+ escape_html(html, ils->content.linkable.title, -1);
+ }
+
+ strbuf_puts(html, "\">");
+ inlines_to_html(html, ils->content.inlines);
+ strbuf_puts(html, "</a>");
+ break;
+
+ case INL_IMAGE:
+ strbuf_puts(html, "<img src=\"");
+ if (ils->content.linkable.url)
+ escape_href(html, ils->content.linkable.url, -1);
+
+ inlines_to_html(&scrap, ils->content.inlines);
+ strbuf_puts(html, "\" alt=\"");
+ if (scrap.size)
+ escape_html(html, scrap.ptr, scrap.size);
+ strbuf_clear(&scrap);
+
+ if (ils->content.linkable.title) {
+ strbuf_puts(html, "\" title=\"");
+ escape_html(html, ils->content.linkable.title, -1);
+ }
+
+ strbuf_puts(html, "\"/>");
+ break;
+
+ case INL_STRONG:
+ strbuf_puts(html, "<strong>");
+ inlines_to_html(html, ils->content.inlines);
+ strbuf_puts(html, "</strong>");
+ break;
+
+ case INL_EMPH:
+ strbuf_puts(html, "<em>");
+ inlines_to_html(html, ils->content.inlines);
+ strbuf_puts(html, "</em>");
+ break;
+ }
+ ils = ils->next;
+ }
+}
+
+// Convert a node_block list to HTML. Returns 0 on success, and sets result.
+static void blocks_to_html(strbuf *html, node_block *b, bool tight)
+{
+ struct ListData *data;
+
+ while(b != NULL) {
+ switch(b->tag) {
+ case BLOCK_DOCUMENT:
+ blocks_to_html(html, b->children, false);
+ break;
+
+ case BLOCK_PARAGRAPH:
+ if (tight) {
+ inlines_to_html(html, b->inline_content);
+ } else {
+ cr(html);
+ strbuf_puts(html, "<p>");
+ inlines_to_html(html, b->inline_content);
+ strbuf_puts(html, "</p>\n");
+ }
+ break;
+
+ case BLOCK_BQUOTE:
+ cr(html);
+ strbuf_puts(html, "<blockquote>\n");
+ blocks_to_html(html, b->children, false);
+ strbuf_puts(html, "</blockquote>\n");
+ break;
+
+ case BLOCK_LIST_ITEM:
+ cr(html);
+ strbuf_puts(html, "<li>");
+ blocks_to_html(html, b->children, tight);
+ strbuf_trim(html); /* TODO: rtrim */
+ strbuf_puts(html, "</li>\n");
+ break;
+
+ case BLOCK_LIST:
+ // make sure a list starts at the beginning of the line:
+ cr(html);
+ data = &(b->as.list);
+
+ if (data->start > 1) {
+ strbuf_printf(html, "<%s start=\"%d\">\n",
+ data->list_type == bullet ? "ul" : "ol",
+ data->start);
+ } else {
+ strbuf_puts(html, data->list_type == bullet ? "<ul>\n" : "<ol>\n");
+ }
+
+ blocks_to_html(html, b->children, data->tight);
+ strbuf_puts(html, data->list_type == bullet ? "</ul>" : "</ol>");
+ strbuf_putc(html, '\n');
+ break;
+
+ case BLOCK_ATX_HEADER:
+ case BLOCK_SETEXT_HEADER:
+ cr(html);
+ strbuf_printf(html, "<h%d>", b->as.header.level);
+ inlines_to_html(html, b->inline_content);
+ strbuf_printf(html, "</h%d>\n", b->as.header.level);
+ break;
+
+ case BLOCK_INDENTED_CODE:
+ case BLOCK_FENCED_CODE:
+ cr(html);
+
+ strbuf_puts(html, "<pre><code");
+
+ if (b->tag == BLOCK_FENCED_CODE) {
+ strbuf *info = &b->as.code.info;
+
+ if (strbuf_len(info) > 0) {
+ int first_tag = strbuf_strchr(info, ' ', 0);
+ if (first_tag < 0)
+ first_tag = strbuf_len(info);
+
+ strbuf_puts(html, " class=\"language-");
+ escape_html(html, info->ptr, first_tag);
+ strbuf_putc(html, '"');
+ }
+ }
+
+ strbuf_putc(html, '>');
+ escape_html(html, b->string_content.ptr, b->string_content.size);
+ strbuf_puts(html, "</code></pre>\n");
+ break;
+
+ case BLOCK_HTML:
+ strbuf_put(html, b->string_content.ptr, b->string_content.size);
+ break;
+
+ case BLOCK_HRULE:
+ strbuf_puts(html, "<hr />\n");
+ break;
+
+ case BLOCK_REFERENCE_DEF:
+ break;
+
+ default:
+ assert(false);
+ }
+
+ b = b->next;
+ }
+}
+
+void stmd_render_html(strbuf *html, node_block *root)
+{
+ blocks_to_html(html, root, false);
+}