Rewrite algorithm

Changes:

* Output less entities in places where they aren’t needed.

Features:

* `quote` — Preferred attribute quote to use;
* `quoteSmart` — Use other quote if shorter;
* `preferUnquoted` — Use no quotes if shorter;
* `omitOptionalTags`;
* `collapseEmptyAttributes`;
* `tightSelfClosing` — No space before slash in void elements;
* `tightCommaSeparatedLists`;
* `tightAttributes` — No space between quoted attributes;
* `allowParseErrors` — Smaller size by allowing parse errors;
* `allowDangerousCharacters` — Smaller size by opening up XSS vectors.

Bugs:

* Fix stringification of numeric data attribute (`data-123`
  instead of `data123`).

Refactor:

* Refactor code-style;
* Rewrite tests;
* Remove superfluous dot-files.

Author: wooorm

.editorconfig

@@ -2,14 +2,8 @@ root = true
 
 [*]
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
-
-[*.{json,remarkrc,eslintrc,sh}]
-indent_size = 2
-
-[*.md]
-trim_trailing_whitespace = false

.eslintignore

@@ -4,12 +4,12 @@ var toHTML = require('./index.js');
 
 // Transform:
 var tree = h('.alpha', [
-    'bravo ',
-    h('b', 'charlie'),
-    ' delta ',
-    h('a.echo', {
-        download: true
-    }, 'foxtrot')
+  'bravo ',
+  h('b', 'charlie'),
+  ' delta ',
+  h('a.echo', {
+    download: true
+  }, 'foxtrot')
 ]);
 
 // Yields:

.eslintrc

@@ -1,276 +1,14 @@
 /**
  * @author Titus Wormer
- * @copyright 2015 Titus Wormer
+ * @copyright 2016 Titus Wormer
  * @license MIT
- * @module mdast:to-hast
- * @fileoverview Transform MDAST to HAST.
+ * @module hast:to-html
+ * @fileoverview Stringify HAST to HTML.
  */
 
 'use strict';
 
 /* eslint-env commonjs */
 
-/* Dependencies. */
-var voids = require('html-void-elements');
-var spaces = require('space-separated-tokens').stringify;
-var commas = require('comma-separated-tokens').stringify;
-var information = require('property-information');
-var entities = require('stringify-entities');
-var kebab = require('kebab-case');
-
-/* Methods. */
-var has = Object.prototype.hasOwnProperty;
-
-/* Handlers. */
-var handlers = {};
-
-handlers.root = root;
-handlers.element = element;
-handlers.directive = directive;
-handlers.comment = comment;
-handlers.characterData = characterData;
-handlers.text = text;
-handlers.raw = raw;
-
-/**
- * Check if content of `node` should be escaped.
- *
- * @param {Node} node - Node to check.
- * @return {boolean} - Whether `node` should be escaped.
- */
-function isLiteral(node) {
-    return node && (node.tagName === 'script' || node.tagName === 'style');
-}
-
-/**
- * Stringify one attribute.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {string} name - Attribute name.
- * @param {*} value - Attribute value.
- * @param {boolean} [isAttribute] - Whether `name` is
- *   an attribute.
- * @return {string} - Stringified attribute.
- */
-function attribute(ctx, name, value) {
-    var info = information(name) || {};
-    var options = ctx.entities;
-
-    if (
-        (value === null || value === undefined || value !== value) ||
-        (!value && info.boolean) ||
-        (value === false && info.overloadedBoolean)
-    ) {
-        return '';
-    }
-
-    name = info.name || kebab(name);
-
-    if (
-        info.boolean ||
-        (value === true && info.overloadedBoolean)
-    ) {
-        return entities(name, options);
-    }
-
-    if (typeof value === 'object' && 'length' in value) {
-        value = (info.commaSeparated ? commas : spaces)(value);
-    }
-
-    return entities(name, options) + '="' +
-        entities(String(value), options) + '"';
-}
-
-/**
- * Stringify all attributes.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {Object} props - Attributes.
- * @return {string} - Stringified attributes.
- */
-function attributes(ctx, props) {
-    var values = [];
-    var key;
-    var value;
-    var result;
-
-    for (key in props) {
-        value = props[key];
-
-        if (value === null || value === undefined) {
-            continue;
-        }
-
-        result = attribute(ctx, key, value);
-
-        if (result) {
-            values.push(result);
-        }
-    }
-
-    return values.join(' ');
-}
-
-/**
- * Stringify all children of `parent`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastNode} parent - Parent.
- * @return {string} - Stringified children.
- */
-function all(ctx, parent) {
-    var children = parent && parent.children;
-    var length = children && children.length;
-    var index = -1;
-    var results = [];
-
-    while (++index < length) {
-        results[index] = one(ctx, children[index], parent);
-    }
-
-    return results.join('');
-}
-
-/**
- * Stringify `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastNode} node - Node.
- * @param {HastNode?} [parent] - Parent of `node`, when
- *   applicable.
- * @return {string} - Stringified `node`.
- * @throws {Error} - When `node` cannot be stringified.
- */
-function one(ctx, node, parent) {
-    var type = node && node.type;
-
-    if (!type) {
-        throw new Error('Expected node, not `' + node + '`');
-    }
-
-    if (!has.call(handlers, type)) {
-        throw new Error('Cannot compile unknown node `' + type + '`');
-    }
-
-    return handlers[type](ctx, node, parent);
-}
-
-/**
- * Stringify a directive `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastDirective} node - Node.
- * @return {string} - Stringified `node`.
- */
-function directive(ctx, node) {
-    return '<' + node.value + '>';
-}
-
-/**
- * Stringify a comment `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastComment} node - Node.
- * @return {string} - Stringified `node`.
- */
-function comment(ctx, node) {
-    return '<!--' + node.value + '-->';
-}
-
-/**
- * Stringify `raw`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastCharacterData} node - Node.
- * @return {string} - Stringified `node`.
- */
-function raw(ctx, node) {
-    return ctx.dangerous ? node.value : text(ctx, node);
-}
-
-/**
- * Stringify a character-data `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastCharacterData} node - Node.
- * @return {string} - Stringified `node`.
- */
-function characterData(ctx, node) {
-    return '<![CDATA[' + node.value + ']]>';
-}
-
-/**
- * Stringify a text `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastText} node - Node.
- * @param {HastParent?} [parent] - Parent of `node`.
- * @return {string} - Stringified `node`.
- */
-function text(ctx, node, parent) {
-    return isLiteral(parent) ? node.value : entities(node.value, ctx.entities);
-}
-
-/**
- * Stringify a root `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastRoot} node - Node.
- * @return {string} - Stringified `node`.
- */
-function root(ctx, node) {
-    return all(ctx, node);
-}
-
-/**
- * Stringify an element `node`.
- *
- * @param {Object} ctx - Stringify configuration.
- * @param {HastElement} node - Node.
- * @return {string} - Stringified `node`.
- */
-function element(ctx, node) {
-    var attrs = attributes(ctx, node.properties);
-    var content = all(ctx, node);
-    var name = node.tagName;
-    var value = '<' + name;
-    var selfClosing = ctx.voids.indexOf(name.toLowerCase()) !== -1;
-
-    if (attrs) {
-        value += ' ' + attrs;
-    }
-
-    if (selfClosing && ctx.closeSelfClosing) {
-        value += ' /';
-    }
-
-    value += '>' + content;
-
-    if (!selfClosing) {
-        value += '</' + name + '>';
-    }
-
-    return value;
-}
-
-/**
- * Wrapper.
- *
- * @param {HastNode} node - Node.
- * @param {Object} [options] - Configuration.
- * @return {string} - Stringified `node`.
- */
-function wrapper(node, options) {
-    var settings = options || {};
-    var dangerous = settings.allowDangerousHTML;
-
-    return one({
-        dangerous: dangerous,
-        voids: settings.voids || voids.concat(),
-        entities: settings.entities || { escapeOnly: true },
-        closeSelfClosing: settings.closeSelfClosing
-    }, node);
-}
-
 /* Expose. */
-module.exports = wrapper;
+module.exports = require('./lib/index.js');