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'use strict';
/*! (C) 2017 Andrea Giammarchi @WebReflection (MIT) */
// friendly destructuring
viper.viper = viper;
// magic entry point for most operations (bind, wire)
function viper(HTML) {
return arguments.length < 2 ?
(HTML == null || typeof HTML === 'string' ?
render.bind({}) :
('raw' in HTML ?
render.bind({})(HTML) :
wireWeakly(HTML, 'html'))) :
('raw' in HTML ?
render.bind({}) : viper.wire
).apply(null, arguments);
}
// viperHTML \o/
//
// var render = viperHTML.bind(object);
// render`
// <h1>⚡️ viperHTML ⚡️</h1>
// <p>
// ${(new Date).toLocaleString()}
// </p>
// `;
function render(template) {
var viper = vipers.get(this);
if (
!viper ||
viper.template !== template
) {
viper = upgrade.apply(this, arguments);
vipers.set(this, viper);
}
return (this instanceof Async ? this.update : update)
.apply(viper, arguments);
}
// A wire ➰ is a shortcut to relate a specific object,
// or a runtime created one, to a specific template.
//
// var render = viperHTML.wire();
// render`
// <div>Hello Wired!</div>
// `;
viper.wire = function wire(obj, type) {
return arguments.length < 1 || obj == null ?
render.bind({}) :
wireWeakly(obj, type || 'html');
};
// An asynchronous wire ➰ is a weakly referenced callback,
// to be invoked right before the template literals
// to return a rendered capable of resolving chunks.
viper.async = function getAsync(obj) {
return arguments.length < 1 ?
createAsync() :
(asyncs.get(obj) || set(asyncs, obj, createAsync()));
};
// reflection hyperHTML.escape API
viper.escape = escape;
// viper.Component([initialState]) 🍻
// An overly-simplified Component class.
class Component {
handleEvent() { /* noop by default */ }
get html() { return (this.html = render.bind(this)); }
set html(value) { defineValue(this, 'html', value); }
get svg() { return (this.svg = render.bind(this)); }
set svg(value) { defineValue(this, 'svg', value); }
get state() { return (this.state = this.defaultState); }
set state(value) { defineValue(this, 'state', value); }
get defaultState() { return {}; }
setState(state) {
var target = this.state;
var source = typeof state === 'function' ? state.call(this, target) : state;
for (var key in source) target[key] = source[key];
this.render();
}
// the render must be defined when extending hyper.Component
// the render **must** return either comp.html or comp.svg wire
// render() { return this.html`<p>that's it</p>`; }
}
viper.Component = Component;
// - - - - - - - - - - - - - - - - - - - - - - -
// -------------------------
// Helpers
// -------------------------
// used to force html output
function asHTML(html) {
return {html: html};
}
// parse all comments at once and sanitize them
function comments($0, $1, $2, $3) {
return $1 + $2.replace(FIND_ATTRIBUTES, sanitizeAttributes) + $3;
}
// instrument a wire to work asynchronously
// passing along an optional resolved chunks
// interceptor callback
function createAsync() {
var
wired = new Async,
wire = render.bind(wired),
chunksReceiver
;
wired.update = function () {
this.callback = chunksReceiver;
return chunks.apply(this, arguments);
};
return function (callback) {
chunksReceiver = callback || String;
return wire;
};
}
// set a configurable, non enumerable, non writable property
function defineValue(self, key, value) {
Object.defineProperty(self, key, {configurable: true, value: value});
}
// splice 0 - length an array and join its content
function empty(array) {
return array.splice(0, array.length).join('');
}
// ensure String value and escape it
function escape(s) {
return htmlEscape(String(s));
}
// given a list of updates
// create a copy with the right update for HTML
function fixUpdates(updates) {
for (var
update,
i = 0,
length = updates.length,
out = new Array(length);
i < length; i++
) {
update = updates[i];
out[i] = update === getUpdateForHTML ?
update.call(this) : update;
}
return out;
}
// if an interpolated value is an Array
// return Promise or join by empty string
function getUpdateForHTML() {
return this instanceof Async ? identity : asTemplateValue;
}
// pass along a generic value
function identity(value) {
return value;
}
// use a placeholder and resolve with the right callback
function invokeAtDistance(value) {
if ('text' in value) {
return Promise.resolve(value.text).then(String).then(asTemplateValue);
} else if ('any' in value) {
return Promise.resolve(value.any).then(asTemplateValue);
} else if ('html' in value) {
return Promise.resolve(value.html).then(asHTML).then(asTemplateValue);
} else {
return Promise.resolve(invokeTransformer(value)).then(asTemplateValue);
}
}
// last attempt to transform content
function invokeTransformer(object) {
for (var key in transformers) {
if (object.hasOwnProperty(key)) {
return transformers[key](object[key]);
}
}
}
// multiple content joined as single string
function asTemplateValue(value, isAttribute) {
var suffix = isAttribute ? '' : HYPER_COMMENT;
switch(typeof value) {
case 'string': return escape(value) + suffix;
case 'boolean':
case 'number': return value + suffix;
case 'object':
if (value instanceof Buffer) return value + suffix;
if (value instanceof Component) return asTemplateValue(value.render(), isAttribute);
case 'undefined':
if (value == null) return '' + suffix;
default:
if (isArray(value)) {
for (var i = 0, length = value.length; i < length; i++) {
if (value[i] instanceof Component) {
value[i] = value[i].render();
}
}
return value.join('') + suffix;
}
if ('placeholder' in value) return invokeAtDistance(value);
if ('text' in value) return escape(value.text) + suffix;
if ('any' in value) return asTemplateValue(value.any, isAttribute);
if ('html' in value) return [].concat(value.html).join('') + suffix;
return asTemplateValue(invokeTransformer(value), isAttribute);
}
}
// sanitizes quotes around attributes
function sanitizeAttributes($0, $1, $2) {
return $1 + ($2 || '"') + UID + ($2 || '"');
}
// weakly relate a generic object to a genric value
function set(map, object, value) {
map.set(object, value);
return value;
}
// join a template via unique comment
// look for comments in attributes and content
// define updates to be invoked for this template
// sanitize and clean the layout too
function transform(template) {
var tagName = '';
var isCDATA = false;
var current = [];
var chunks = [];
var updates = [];
var content = new Parser({
onopentag: function (name, attributes) {
tagName = name;
current.push('<', name);
for (var key in attributes) {
if (attributes.hasOwnProperty(key)) {
var value = attributes[key];
var isPermutation = value === UID;
var isSpecial = SPECIAL_ATTRIBUTE.test(key);
var isEvent = isPermutation && ATTRIBUTE_EVENT.test(key);
if (isPermutation) {
if (isSpecial) {
if (isEvent) {
current.push(' ', key, '="');
updates.push(updateEvent);
} else {
updates.push(updateBoolean(key));
}
} else {
current.push(' ', key, '="');
updates.push(updateAttribute);
}
chunks.push(empty(current));
if (!isSpecial || isEvent) current.push('"');
} else {
if (isSpecial && value.length === 0) {
current.push(' ', key);
} else {
var quote = value.indexOf('"') < 0 ? '"' : "'";
current.push(' ', key, '=', quote, value, quote);
}
}
}
}
current.push('>');
},
oncdatastart: function () {
current.push('<![CDATA[');
isCDATA = true;
},
oncdataend: function () {
current.push(']]>');
isCDATA = false;
},
onprocessinginstruction: function (name, data) {
current.push('<', data, '>');
},
onclosetag: function (name) {
if (!VOID_ELEMENT.test(name)) {
current.push('</', name, '>');
}
tagName = '';
},
ontext: function (text) {
var length = updates.length - 1;
switch (true) {
case isCDATA:
case /^pre|code$/i.test(tagName):
current.push(text);
break;
case /^script$/i.test(tagName):
current.push(minifyJS(text));
break;
case /^style$/i.test(tagName):
current.push(minifyCSS(text));
break;
default:
current.push(text);
break;
}
},
oncomment: function (data) {
if (data === UID) {
chunks.push(empty(current));
updates.push(getUpdateForHTML);
} else {
current.push('<!--' + data + '-->');
}
},
onend: function () {
chunks.push(empty(current));
}
}, {
decodeEntities: false,
xmlMode: true
});
content.write(template.join(UIDC).replace(NO, comments));
content.end();
return {
chunks: chunks,
updates: updates
};
}
// same as escape but specific for attributes
function updateAttribute(s) {
return htmlEscape(String(s));
}
// return the right callback to update a boolean attribute
// after modifying the template to ignore such attribute if falsy
function updateBoolean(name) {
name = ' ' + name;
function update(value) {
switch (value) {
case true:
case 'true':
return name;
}
return '';
}
update[UID] = true;
return update;
}
// return the right callback to invoke an event
// stringifying the callback and invoking it
// to simulate a proper DOM behavior
function updateEvent(value) {
switch (typeof value) {
case 'function': return 'return (' + escape(
JS_SHORTCUT.test(value) && !JS_FUNCTION.test(value) ?
('function ' + value) :
('' + value)
) + ').call(this, event)';
case 'object': return '';
default: return escape(value || '');
}
}
// -------------------------
// Minifiers
// -------------------------
function minifyCSS() {
return csso.minify.apply(csso, arguments).css;
}
function minifyJS(code, options) {
var result = uglify.minify(code, Object.assign({
// uglify-js defaults
output: {comments: /^!/}
}, options));
return result.error ? code : result.code;
}
// -------------------------
// Template setup
// -------------------------
// resolves through promises and
// invoke a notifier per each resolved chunk
// the context will be a viper
function chunks() {
for (var
update,
out = [],
updates = this.updates,
template = this.chunks,
callback = this.callback,
all = Promise.resolve(template[0]),
chain = function (after) {
return all.then(function (through) {
notify(through);
return after;
});
},
getSubValue = function (value) {
if (isArray(value)) {
value.forEach(getSubValue);
} else {
all = chain(
Promise.resolve(value)
.then(resolveArray)
);
}
},
getValue = function (value) {
if (isArray(value)) {
value.forEach(getSubValue);
all = chain(Promise.resolve(HYPER_COMMENT));
} else {
all = chain(
Promise.resolve(value)
.then(resolveAsTemplateValue(update))
.then(update === asTemplateValue ? identity : update)
);
}
},
notify = function (chunk) {
out.push(chunk);
callback(chunk);
},
i = 1,
length = arguments.length; i < length; i++
) {
update = updates[i - 1];
getValue(arguments[i]);
all = chain(template[i]);
}
return all.then(notify).then(function () { return out; });
}
// tweaks asTemplateValue to think the value is an Array
// but without needing to add the suffix.
// Used to place an hyper comment after a group of values has been resolved
// instead of per each resolved value.
function resolveArray(value) {
return asTemplateValue(isArray(value) ? value : [value], true);
}
// invokes at distance asTemplateValue
// passing the "isAttribute" flag
function resolveAsTemplateValue(update) {
return function (value) {
return asTemplateValue(
value,
update === updateAttribute ||
update === updateEvent ||
UID in update
);
};
}
// each known viperHTML update is
// kept as simple as possible.
// the context will be a viper
function update() {
for (var
updates = this.updates,
template = this.chunks,
i = 1,
length = arguments.length,
out = [template[0]];
i < length; i++
) {
out.push(updates[i - 1](arguments[i]), template[i]);
}
return Buffer.from(out.join(''));
}
// but the first time, it needs to be setup.
// From now on, only update(tempalte) will be called
// unless this context won't be used for other renderings.
function upgrade(template) {
var info = templates.get(template) ||
set(templates, template, transform(template));
return {
template: template,
updates: fixUpdates.call(this, info.updates),
chunks: info.chunks
};
}
// -------------------------
// Wires
// -------------------------
function wireWeakly(obj, id) {
var wire = wires.get(obj) || set(wires, obj, new Dict);
return wire[id] || (wire[id] = render.bind({}));
}
// -------------------------
// local variables
// -------------------------
var
HYPER_COMMENT = '<!--_hyper: 8;-->',
VOID_ELEMENT = /^area|base|br|col|embed|hr|img|input|keygen|link|menuitem|meta|param|source|track|wbr$/i,
UID = '_viperHTML: ' + require('crypto').randomBytes(16).toString('hex') + ';',
UIDC = '<!--' + UID + '-->',
ATTRIBUTE_EVENT = /^on\S+$/,
JS_SHORTCUT = /^[a-z$_]\S*?\(/,
JS_FUNCTION = /^function\S*?\(/,
SPECIAL_ATTRIBUTE = /^(?:(?:on|allow)[a-z]+|async|autofocus|autoplay|capture|checked|controls|default|defer|disabled|formnovalidate|hidden|ismap|itemscope|loop|multiple|muted|nomodule|novalidate|open|playsinline|readonly|required|reversed|selected|truespeed|typemustmatch|usecache)$/,
NO = /(<[a-z]+[a-z0-9:_-]*)((?:[^\S]+[a-z0-9:_-]+(?:=(?:'.*?'|".*?"|<.+?>|\S+))?)+)([^\S]*\/?>)/gi,
FIND_ATTRIBUTES = new RegExp('([^\\S][a-z]+[a-z0-9:_-]*=)([\'"]?)' + UIDC + '\\2', 'gi'),
csso = require('csso'),
uglify = require("uglify-js"),
Parser = require('htmlparser2').Parser,
htmlEscape = require('html-escaper').escape,
templates = new Map(),
asyncs = new WeakMap(),
vipers = new WeakMap(),
wires = new WeakMap(),
isArray = Array.isArray,
transformers = {}
;
// traps function bind once (useful in destructuring)
viper.bind = function bind(context) { return render.bind(context); };
viper.minify = {
css: minifyCSS,
js: minifyJS
};
viper.define = function define(transformer, callback) {
transformers[transformer] = callback;
};
module.exports = viper;
// local class to easily recognize async wires
function Async() {}
// local class to easily create wires
function Dict() {}
Dict.prototype = Object.create(null);