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

79 lines
2.3 KiB
JavaScript

import { get } from "@ember/object";
export function registerRawHelpers(hbs, handlebarsClass) {
if (!hbs.helpers) {
hbs.helpers = Object.create(handlebarsClass.helpers);
}
hbs.helpers["get"] = function(context, options) {
if (!context || !options.contexts) {
return;
}
if (typeof context !== "string") {
return context;
}
let firstContext = options.contexts[0];
let val = firstContext[context];
if (context.toString().indexOf("controller.") === 0) {
context = context.slice(context.indexOf(".") + 1);
}
return val === undefined ? get(firstContext, context) : val;
};
// #each .. in support (as format is transformed to this)
hbs.registerHelper("each", function(
localName,
inKeyword,
contextName,
options
) {
var list = get(this, contextName);
var output = [];
var innerContext = Object.create(this);
for (var i = 0; i < list.length; i++) {
innerContext[localName] = list[i];
output.push(options.fn(innerContext));
}
return output.join("");
});
function stringCompatHelper(fn) {
const old = hbs.helpers[fn];
hbs.helpers[fn] = function(context, options) {
return old.apply(this, [hbs.helpers.get(context, options), options]);
};
}
// HACK: Ensure that the variable is resolved only once.
// The "get" function will be called twice because both `if` and `unless`
// helpers are patched to resolve the variable and `unless` is implemented
// as not `if`. For example, for {{#unless var}} will generate a stack
// trace like:
//
// - patched-unless("var") "var" is resolved to its value, val
// - unless(val) unless is implemented as !if
// - !patched-if(val) val is already resolved, but it is resolved again
// - !if(???) at this point, ??? usually stands for undefined
//
// The following code ensures that patched-unless will call `if` directly,
// `patched-unless("var")` will return `!if(val)`.
const oldIf = hbs.helpers["if"];
hbs.helpers["unless"] = function(context, options) {
return oldIf.apply(this, [
hbs.helpers.get(context, options),
{
fn: options.inverse,
inverse: options.fn,
hash: options.hash
}
]);
};
stringCompatHelper("if");
stringCompatHelper("with");
}