Start on xml.js.

Just the skeleton, mostly copied from HTML renderer.
Can be simplified because of the regularity of the XML format.
See #280.

3 files changed, 280 insertions, 0 deletions

diff --git a/js/bin/commonmark b/js/bin/commonmark
index 8f1210b..6570ef6 100755
--- a/js/bin/commonmark
+++ b/js/bin/commonmark
@@ -15,6 +15,8 @@ for (i = 2; i < process.argv.length; i++) {
     var arg = process.argv[i];
     if (arg === '--ast') {
         format = 'ast';
+    } else if (arg === '--xml') {
+        format = 'xml';
     } else if (arg === '--time') {
         options.time = true;
     } else if (arg === '--sourcepos') {
@@ -32,6 +34,8 @@ var renderer;
 
 if (format === 'html') {
     renderer = new commonmark.HtmlRenderer(options);
+} else if (format === 'xml') {
+    renderer = new commonmark.XMLRenderer(options);
 } else if (format === 'ast') {
     renderer = new commonmark.ASTRenderer(options);
     renderer.options.colors = true;
diff --git a/js/lib/index.js b/js/lib/index.js
index 22a2184..b309311 100755
--- a/js/lib/index.js
+++ b/js/lib/index.js
@@ -16,6 +16,7 @@ var util = require('util');
 module.exports.Node = require('./node');
 module.exports.DocParser = require('./blocks');
 module.exports.HtmlRenderer = require('./html');
+module.exports.XMLRenderer = require('./xml');
 module.exports.ASTRenderer = function(options) {
     return {
         render: function(tree) {
diff --git a/js/lib/xml.js b/js/lib/xml.js
new file mode 100644
index 0000000..7168ffa
--- /dev/null
+++ b/js/lib/xml.js
@@ -0,0 +1,275 @@
+"use strict";
+
+// Helper function to produce an XML tag.
+var tag = function(name, attrs, selfclosing) {
+    var result = '<' + name;
+    if (attrs && attrs.length > 0) {
+        var i = 0;
+        var attrib;
+        while ((attrib = attrs[i]) !== undefined) {
+            result = result.concat(' ', attrib[0], '="', attrib[1], '"');
+            i++;
+        }
+    }
+    if (selfclosing) {
+        result += ' /';
+    }
+
+    result += '>';
+    return result;
+};
+
+var reXMLTag = /\<[^>]*\>/;
+
+var renderNodes = function(block) {
+
+    var attrs;
+    var info_words;
+    var tagname;
+    var walker = block.walker();
+    var event, node, entering;
+    var buffer = "";
+    var lastOut = "\n";
+    var disableTags = 0;
+    var indentLevel = 0;
+    var indent = '  ';
+    var grandparent;
+    var out = function(s) {
+        if (disableTags > 0) {
+            buffer += s.replace(reXMLTag, '');
+        } else {
+            buffer += s;
+        }
+        lastOut = s;
+    };
+    var esc = this.escape;
+    var cr = function() {
+        if (lastOut !== '\n') {
+            buffer += '\n';
+            lastOut = '\n';
+            for (var i = indentLevel; i--;) {
+                buffer += indent;
+            }
+        }
+    };
+
+    var options = this.options;
+
+    if (options.time) { console.time("rendering"); }
+
+    while ((event = walker.next())) {
+        entering = event.entering;
+        node = event.node;
+
+        attrs = [];
+        if (options.sourcepos) {
+            var pos = node.sourcepos;
+            if (pos) {
+                attrs.push(['data-sourcepos', String(pos[0][0]) + ':' +
+                            String(pos[0][1]) + '-' + String(pos[1][0]) + ':' +
+                            String(pos[1][1])]);
+            }
+        }
+
+        switch (node.t) {
+        case 'Text':
+            out(esc(node.literal));
+            break;
+
+        case 'Softbreak':
+            out(this.softbreak);
+            break;
+
+        case 'Hardbreak':
+            out(tag('br', [], true));
+            cr();
+            break;
+
+        case 'Emph':
+            out(tag(entering ? 'em' : '/em'));
+            break;
+
+        case 'Strong':
+            out(tag(entering ? 'strong' : '/strong'));
+            break;
+
+        case 'XML':
+            out(node.literal);
+            break;
+
+        case 'Link':
+            if (entering) {
+                attrs.push(['href', esc(node.destination, true)]);
+                if (node.title) {
+                    attrs.push(['title', esc(node.title, true)]);
+                }
+                out(tag('a', attrs));
+            } else {
+                out(tag('/a'));
+            }
+            break;
+
+        case 'Image':
+            if (entering) {
+                if (disableTags === 0) {
+                    out('<img src="' + esc(node.destination, true) +
+                        '" alt="');
+                }
+                disableTags += 1;
+            } else {
+                disableTags -= 1;
+                if (disableTags === 0) {
+                    if (node.title) {
+                        out('" title="' + esc(node.title, true));
+                    }
+                    out('" />');
+                }
+            }
+            break;
+
+        case 'Code':
+            out(tag('code') + esc(node.literal) + tag('/code'));
+            break;
+
+        case 'Document':
+            if (!entering) {
+                cr();
+            }
+            break;
+
+        case 'Paragraph':
+            grandparent = node.parent.parent;
+            if (grandparent !== null &&
+                grandparent.t === 'List') {
+                if (grandparent.list_data.tight) {
+                    break;
+                }
+            }
+            if (entering) {
+                cr();
+                out(tag('p', attrs));
+            } else {
+                out(tag('/p'));
+            }
+            break;
+
+        case 'BlockQuote':
+            if (entering) {
+                cr();
+                out(tag('blockquote', attrs));
+                indentLevel += 1;
+            } else {
+                indentLevel -= 1;
+                cr();
+                out(tag('/blockquote'));
+            }
+            break;
+
+        case 'ListItem':
+            if (entering) {
+                cr();
+                out(tag('li', attrs));
+            } else {
+                out(tag('/li'));
+            }
+            break;
+
+        case 'List':
+            tagname = node.list_data.type === 'Bullet' ? 'ul' : 'ol';
+            if (entering) {
+                if (node.list_data.start && node.list_data.start > 1) {
+                    attrs.push(['start', node.list_data.start.toString()]);
+                }
+                cr();
+                out(tag(tagname, attrs));
+            } else {
+                cr();
+                out(tag('/' + tagname));
+            }
+            break;
+
+        case 'Header':
+            tagname = 'h' + node.level;
+            if (entering) {
+                cr();
+                out(tag(tagname, attrs));
+            } else {
+                out(tag('/' + tagname));
+            }
+            break;
+
+        case 'CodeBlock':
+            info_words = node.info ? node.info.split(/ +/) : [];
+            if (info_words.length > 0 && info_words[0].length > 0) {
+                attrs.push(['class', 'language-' + esc(info_words[0], true)]);
+            }
+            cr();
+            out(tag('pre') + tag('code', attrs));
+            out(esc(node.literal));
+            out(tag('/code') + tag('/pre'));
+            break;
+
+        case 'XMLBlock':
+            cr();
+            out(node.literal);
+            break;
+
+        case 'HorizontalRule':
+            cr();
+            out(tag('hr', attrs, true));
+            break;
+
+
+        case 'ReferenceDef':
+            break;
+
+        default:
+            throw("Unknown node type " + node.t);
+        }
+
+    }
+    if (options.time) { console.timeEnd("rendering"); }
+    return buffer;
+};
+
+var replaceUnsafeChar = function(s) {
+    switch (s) {
+    case '&':
+        return '&amp;';
+    case '<':
+        return '&lt;';
+    case '>':
+        return '&gt;';
+    case '"':
+        return '&quot;';
+    default:
+        return s;
+    }
+};
+
+var reNeedsEscaping = /[&<>"]/;
+
+// The XMLRenderer object.
+function XMLRenderer(options){
+    return {
+        // default options:
+        softbreak: '\n', // by default, soft breaks are rendered as newlines in HTML
+        // set to "<br />" to make them hard breaks
+        // set to " " if you want to ignore line wrapping in source
+        escape: function(s, preserve_entities) {
+            if (reNeedsEscaping.test(s)) {
+                if (preserve_entities) {
+                    return s.replace(/[&](?:[#](x[a-f0-9]{1,8}|[0-9]{1,8});|[a-z][a-z0-9]{1,31};)|[&<>"]/gi, replaceUnsafeChar);
+                } else {
+                    return s.replace(/[&<>"]/g, replaceUnsafeChar);
+                }
+            } else {
+                return s;
+            }
+        },
+        options: options || {},
+        render: renderNodes
+    };
+}
+
+module.exports = XMLRenderer;