From de8fd9328e9deb0d1ec596d7486686ea3cb688c2 Mon Sep 17 00:00:00 2001
From: "Felix (xq) Queißner" <git@mq32.de>
Date: Tue, 9 Jun 2020 18:27:38 +0200
Subject: Includes cmark markdown parser library.

---
 lib/cmark/src/xml.c | 173 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 lib/cmark/src/xml.c

(limited to 'lib/cmark/src/xml.c')

diff --git a/lib/cmark/src/xml.c b/lib/cmark/src/xml.c
new file mode 100644
index 0000000..9306141
--- /dev/null
+++ b/lib/cmark/src/xml.c
@@ -0,0 +1,173 @@
+#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"
+
+#define BUFFER_SIZE 100
+
+// Functions to convert cmark_nodes to XML strings.
+
+static void escape_xml(cmark_strbuf *dest, const unsigned char *source,
+                       bufsize_t length) {
+  houdini_escape_html0(dest, source, length, 0);
+}
+
+struct render_state {
+  cmark_strbuf *xml;
+  int indent;
+};
+
+static CMARK_INLINE void indent(struct render_state *state) {
+  int i;
+  for (i = 0; i < state->indent; i++) {
+    cmark_strbuf_putc(state->xml, ' ');
+  }
+}
+
+static int S_render_node(cmark_node *node, cmark_event_type ev_type,
+                         struct render_state *state, int options) {
+  cmark_strbuf *xml = state->xml;
+  bool literal = false;
+  cmark_delim_type delim;
+  bool entering = (ev_type == CMARK_EVENT_ENTER);
+  char buffer[BUFFER_SIZE];
+
+  if (entering) {
+    indent(state);
+    cmark_strbuf_putc(xml, '<');
+    cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
+
+    if (options & CMARK_OPT_SOURCEPOS && node->start_line != 0) {
+      snprintf(buffer, BUFFER_SIZE, " sourcepos=\"%d:%d-%d:%d\"",
+               node->start_line, node->start_column, node->end_line,
+               node->end_column);
+      cmark_strbuf_puts(xml, buffer);
+    }
+
+    literal = false;
+
+    switch (node->type) {
+    case CMARK_NODE_DOCUMENT:
+      cmark_strbuf_puts(xml, " xmlns=\"http://commonmark.org/xml/1.0\"");
+      break;
+    case CMARK_NODE_TEXT:
+    case CMARK_NODE_CODE:
+    case CMARK_NODE_HTML_BLOCK:
+    case CMARK_NODE_HTML_INLINE:
+      cmark_strbuf_puts(xml, " xml:space=\"preserve\">");
+      escape_xml(xml, node->data, node->len);
+      cmark_strbuf_puts(xml, "</");
+      cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
+      literal = true;
+      break;
+    case CMARK_NODE_LIST:
+      switch (cmark_node_get_list_type(node)) {
+      case CMARK_ORDERED_LIST:
+        cmark_strbuf_puts(xml, " type=\"ordered\"");
+        snprintf(buffer, BUFFER_SIZE, " start=\"%d\"",
+                 cmark_node_get_list_start(node));
+        cmark_strbuf_puts(xml, buffer);
+        delim = cmark_node_get_list_delim(node);
+        if (delim == CMARK_PAREN_DELIM) {
+          cmark_strbuf_puts(xml, " delim=\"paren\"");
+        } else if (delim == CMARK_PERIOD_DELIM) {
+          cmark_strbuf_puts(xml, " delim=\"period\"");
+        }
+        break;
+      case CMARK_BULLET_LIST:
+        cmark_strbuf_puts(xml, " type=\"bullet\"");
+        break;
+      default:
+        break;
+      }
+      snprintf(buffer, BUFFER_SIZE, " tight=\"%s\"",
+               (cmark_node_get_list_tight(node) ? "true" : "false"));
+      cmark_strbuf_puts(xml, buffer);
+      break;
+    case CMARK_NODE_HEADING:
+      snprintf(buffer, BUFFER_SIZE, " level=\"%d\"", node->as.heading.level);
+      cmark_strbuf_puts(xml, buffer);
+      break;
+    case CMARK_NODE_CODE_BLOCK:
+      if (node->as.code.info) {
+        cmark_strbuf_puts(xml, " info=\"");
+        escape_xml(xml, node->as.code.info, strlen((char *)node->as.code.info));
+        cmark_strbuf_putc(xml, '"');
+      }
+      cmark_strbuf_puts(xml, " xml:space=\"preserve\">");
+      escape_xml(xml, node->data, node->len);
+      cmark_strbuf_puts(xml, "</");
+      cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
+      literal = true;
+      break;
+    case CMARK_NODE_CUSTOM_BLOCK:
+    case CMARK_NODE_CUSTOM_INLINE:
+      cmark_strbuf_puts(xml, " on_enter=\"");
+      escape_xml(xml, node->as.custom.on_enter,
+                 strlen((char *)node->as.custom.on_enter));
+      cmark_strbuf_putc(xml, '"');
+      cmark_strbuf_puts(xml, " on_exit=\"");
+      escape_xml(xml, node->as.custom.on_exit,
+                 strlen((char *)node->as.custom.on_exit));
+      cmark_strbuf_putc(xml, '"');
+      break;
+    case CMARK_NODE_LINK:
+    case CMARK_NODE_IMAGE:
+      cmark_strbuf_puts(xml, " destination=\"");
+      escape_xml(xml, node->as.link.url, strlen((char *)node->as.link.url));
+      cmark_strbuf_putc(xml, '"');
+      if (node->as.link.title) {
+        cmark_strbuf_puts(xml, " title=\"");
+        escape_xml(xml, node->as.link.title,
+                   strlen((char *)node->as.link.title));
+        cmark_strbuf_putc(xml, '"');
+      }
+      break;
+    default:
+      break;
+    }
+    if (node->first_child) {
+      state->indent += 2;
+    } else if (!literal) {
+      cmark_strbuf_puts(xml, " /");
+    }
+    cmark_strbuf_puts(xml, ">\n");
+
+  } else if (node->first_child) {
+    state->indent -= 2;
+    indent(state);
+    cmark_strbuf_puts(xml, "</");
+    cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
+    cmark_strbuf_puts(xml, ">\n");
+  }
+
+  return 1;
+}
+
+char *cmark_render_xml(cmark_node *root, int options) {
+  char *result;
+  cmark_strbuf xml = CMARK_BUF_INIT(root->mem);
+  cmark_event_type ev_type;
+  cmark_node *cur;
+  struct render_state state = {&xml, 0};
+
+  cmark_iter *iter = cmark_iter_new(root);
+
+  cmark_strbuf_puts(state.xml, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
+  cmark_strbuf_puts(state.xml,
+                    "<!DOCTYPE document SYSTEM \"CommonMark.dtd\">\n");
+  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(&xml);
+
+  cmark_iter_free(iter);
+  return result;
+}
-- 
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