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// Helper function to produce content in a pair of HTML tags.
var inTags = function(tag, attribs, contents, selfclosing) {
var result = '<' + tag;
if (attribs) {
var i = 0;
var attrib;
while ((attrib = attribs[i]) !== undefined) {
result = result.concat(' ', attrib[0], '="', attrib[1], '"');
i++;
}
}
if (contents) {
result = result.concat('>', contents, '</', tag, '>');
} else if (selfclosing) {
result = result + ' />';
} else {
result = result.concat('></', tag, '>');
}
return result;
};
// Render an inline element as HTML.
var renderInline = function(inline) {
var attrs;
switch (inline.t) {
case 'Str':
return this.escape(inline.c);
case 'Softbreak':
return this.softbreak;
case 'Hardbreak':
return inTags('br',[],"",true) + '\n';
case 'Emph':
return inTags('em', [], this.renderInlines(inline.c));
case 'Strong':
return inTags('strong', [], this.renderInlines(inline.c));
case 'Html':
return inline.c;
case 'Link':
attrs = [['href', this.escape(inline.destination, true)]];
if (inline.title) {
attrs.push(['title', this.escape(inline.title, true)]);
}
return inTags('a', attrs, this.renderInlines(inline.label));
case 'Image':
attrs = [['src', this.escape(inline.destination, true)],
['alt', this.renderInlines(inline.label).
replace(/\<[^>]*alt="([^"]*)"[^>]*\>/g, '$1').
replace(/\<[^>]*\>/g,'')]];
if (inline.title) {
attrs.push(['title', this.escape(inline.title, true)]);
}
return inTags('img', attrs, "", true);
case 'Code':
return inTags('code', [], this.escape(inline.c));
default:
console.log("Unknown inline type " + inline.t);
return "";
}
};
// Render a list of inlines.
var renderInlines = function(inlines) {
var result = '';
for (var i=0; i < inlines.length; i++) {
result = result + this.renderInline(inlines[i]);
}
return result;
};
// Render a single block element.
var renderBlock = function(block, in_tight_list) {
var tag;
var attr;
var info_words;
switch (block.t) {
case 'Document':
var whole_doc = this.renderBlocks(block.children);
return (whole_doc === '' ? '' : whole_doc + '\n');
case 'Paragraph':
if (in_tight_list) {
return this.renderInlines(block.inline_content);
} else {
return inTags('p', [], this.renderInlines(block.inline_content));
}
break;
case 'BlockQuote':
var filling = this.renderBlocks(block.children);
return inTags('blockquote', [], filling === '' ? this.innersep :
this.innersep + filling + this.innersep);
case 'ListItem':
var contents = this.renderBlocks(block.children, in_tight_list);
if (/^[<]/.test(contents)) {
contents = '\n' + contents;
}
if (/[>]$/.test(contents)) {
contents = contents + '\n';
}
return inTags('li', [], contents, false).trim();
case 'List':
tag = block.list_data.type == 'Bullet' ? 'ul' : 'ol';
attr = (!block.list_data.start || block.list_data.start == 1) ?
[] : [['start', block.list_data.start.toString()]];
return inTags(tag, attr, this.innersep +
this.renderBlocks(block.children, block.tight) +
this.innersep);
case 'Header':
tag = 'h' + block.level;
return inTags(tag, [], this.renderInlines(block.inline_content));
case 'CodeBlock':
info_words = block.info ? block.info.split(/ +/) : [];
attr = (info_words.length === 0 || info_words[0].length === 0) ?
[] : [['class','language-' + this.escape(info_words[0],true)]];
return inTags('pre', [],
inTags('code', attr, this.escape(block.string_content)));
case 'HtmlBlock':
return block.string_content;
case 'ReferenceDef':
return "";
case 'HorizontalRule':
return inTags('hr',[],"",true);
default:
console.log("Unknown block type " + block.t);
return "";
}
};
// Render a list of block elements, separated by this.blocksep.
var renderBlocks = function(blocks, in_tight_list) {
var result = [];
for (var i=0; i < blocks.length; i++) {
if (blocks[i].t !== 'ReferenceDef') {
result.push(this.renderBlock(blocks[i], in_tight_list));
}
}
return result.join(this.blocksep);
};
// The HtmlRenderer object.
function HtmlRenderer(){
return {
// default options:
blocksep: '\n', // space between blocks
innersep: '\n', // space between block container tag and contents
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 (preserve_entities) {
return s.replace(/[&](?;|[a-z][a-z0-9]{1,31};)/gi,'&')
.replace(/[<]/g,'<')
.replace(/[>]/g,'>')
.replace(/["]/g,'"');
} else {
return s.replace(/[&]/g,'&')
.replace(/[<]/g,'<')
.replace(/[>]/g,'>')
.replace(/["]/g,'"');
}
},
renderInline: renderInline,
renderInlines: renderInlines,
renderBlock: renderBlock,
renderBlocks: renderBlocks,
render: renderBlock
};
}
module.exports = HtmlRenderer;
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