From 7e0b564af9ea4aaa35feced8c6fda6a97c7f8948 Mon Sep 17 00:00:00 2001
From: Gulliver <gulliver@fargonauten.de>
Date: Thu, 11 Sep 2014 20:31:59 +0200
Subject: using only includes from system

---
 src/html/html.c | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 228 insertions(+)
 create mode 100644 src/html/html.c

(limited to 'src/html/html.c')

diff --git a/src/html/html.c b/src/html/html.c
new file mode 100644
index 0000000..ab6fc35
--- /dev/null
+++ b/src/html/html.c
@@ -0,0 +1,228 @@
+#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;
+	}
+
+	strbuf_free(&scrap);
+}
+
+// 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);
+}
-- 
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