discourse/app/assets/javascripts/discourse-common/lib/raw-handlebars.js.es6

175 lines
5.1 KiB
JavaScript

// This is a mechanism for quickly rendering templates which is Ember aware
// templates are highly compatible with Ember so you don't need to worry about calling "get"
// and computed properties function, additionally it uses stringParams like Ember does
// compat with ie8 in case this gets picked up elsewhere
const objectCreate = Object.create || function(parent) {
function F() {}
F.prototype = parent;
return new F();
};
const RawHandlebars = Handlebars.create();
RawHandlebars.helper = function() {};
RawHandlebars.helpers = objectCreate(Handlebars.helpers);
RawHandlebars.helpers['get'] = function(context, options) {
var firstContext = options.contexts[0];
var val = firstContext[context];
if (context.indexOf('controller.') === 0) {
context = context.slice(context.indexOf('.') + 1);
}
if (val && val.isDescriptor) {
return Em.get(firstContext, context);
}
return val === undefined ? Em.get(firstContext, context) : val;
};
// adds compatability so this works with stringParams
function stringCompatHelper(fn) {
const old = RawHandlebars.helpers[fn];
RawHandlebars.helpers[fn] = function(context,options) {
return old.apply(this, [
RawHandlebars.helpers.get(context,options),
options
]);
};
};
// #each .. in support (as format is transformed to this)
RawHandlebars.registerHelper('each', function(localName,inKeyword,contextName,options){
var list = Em.get(this, contextName);
var output = [];
var innerContext = objectCreate(this);
for (var i=0; i<list.length; i++) {
innerContext[localName] = list[i];
output.push(options.fn(innerContext));
}
return output.join('');
});
stringCompatHelper("if");
stringCompatHelper("unless");
stringCompatHelper("with");
function buildPath(blk, args) {
var result = { type: "PathExpression",
data: false,
depth: blk.path.depth,
loc: blk.path.loc };
// Server side precompile doesn't have jquery.extend
Object.keys(args).forEach(function (a) {
result[a] = args[a];
});
return result;
}
function replaceGet(ast) {
var visitor = new Handlebars.Visitor();
visitor.mutating = true;
visitor.MustacheStatement = function(mustache) {
if (!(mustache.params.length || mustache.hash)) {
mustache.params[0] = mustache.path;
mustache.path = buildPath(mustache, { parts: ['get'], original: 'get', strict: true, falsy: true });
}
return Handlebars.Visitor.prototype.MustacheStatement.call(this, mustache);
};
// rewrite `each x as |y|` as each y in x`
// This allows us to use the same syntax in all templates
visitor.BlockStatement = function(block) {
if (block.path.original === 'each' && block.params.length === 1) {
var paramName = block.program.blockParams[0];
block.params = [ buildPath(block, { original: paramName }),
{ type: "CommentStatement", value: "in" },
block.params[0] ];
delete block.program.blockParams;
}
return Handlebars.Visitor.prototype.BlockStatement.call(this, block);
};
visitor.accept(ast);
}
if (Handlebars.Compiler) {
RawHandlebars.Compiler = function() {};
RawHandlebars.Compiler.prototype = objectCreate(Handlebars.Compiler.prototype);
RawHandlebars.Compiler.prototype.compiler = RawHandlebars.Compiler;
RawHandlebars.JavaScriptCompiler = function() {};
RawHandlebars.JavaScriptCompiler.prototype = objectCreate(Handlebars.JavaScriptCompiler.prototype);
RawHandlebars.JavaScriptCompiler.prototype.compiler = RawHandlebars.JavaScriptCompiler;
RawHandlebars.JavaScriptCompiler.prototype.namespace = "RawHandlebars";
RawHandlebars.precompile = function(value, asObject) {
var ast = Handlebars.parse(value);
replaceGet(ast);
var options = {
knownHelpers: {
get: true
},
data: true,
stringParams: true
};
asObject = asObject === undefined ? true : asObject;
var environment = new RawHandlebars.Compiler().compile(ast, options);
return new RawHandlebars.JavaScriptCompiler().compile(environment, options, undefined, asObject);
};
RawHandlebars.compile = function(string) {
var ast = Handlebars.parse(string);
replaceGet(ast);
// this forces us to rewrite helpers
var options = { data: true, stringParams: true };
var environment = new RawHandlebars.Compiler().compile(ast, options);
var templateSpec = new RawHandlebars.JavaScriptCompiler().compile(environment, options, undefined, true);
var t = RawHandlebars.template(templateSpec);
t.isMethod = false;
return t;
};
}
RawHandlebars.get = function(ctx, property, options) {
if (options.types && options.data.view) {
var view = options.data.view;
return view.getStream ? view.getStream(property).value() : view.getAttr(property);
} else {
return Ember.get(ctx, property);
}
};
export function template() {
return RawHandlebars.template.apply(this, arguments);
}
export function precompile() {
return RawHandlebars.precompile.apply(this, arguments);
}
export function compile() {
return RawHandlebars.compile.apply(this, arguments);
}
export function get() {
return RawHandlebars.get.apply(this, arguments);
}
export default RawHandlebars;