59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
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'use strict';
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var generateId = require('./generate-id');
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var ID_LENGTH = 8;
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var ID_PREFIX = '__aSyNcId__';
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// NOTE: We must include a character which is escaped by Handlebars in the "async id"
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// This is so that when using an async helper "inline", such as {{asyncHelper "foo"}}
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// the content is correctly escaped depending on whether double or triple braces.
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var ID_ESCAPED_STRING = '<_';
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var ID_SUFFIX = '__';
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function resolve(cache, fn, context) {
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var id = ID_PREFIX + ID_ESCAPED_STRING + generateId(ID_LENGTH) + ID_SUFFIX;
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cache[id] = new Promise(function(passed, failed) {
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try {
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fn(context, function(res) {
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passed(res);
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});
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} catch (error) {
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failed(error);
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}
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});
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return id;
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}
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// cache is an object where the keys are cache keys and values are promises. See above.
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function done(cache, callback) {
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return Promise.all(Object.values(cache))
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.then(function(values) {
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var resolvedCache = {};
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var keys = Object.keys(cache);
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values.forEach(function(value, index) {
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resolvedCache[keys[index]] = value;
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});
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callback(null, resolvedCache);
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}).catch(function(error) {
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callback(error);
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});
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}
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function hasResolvers(text) {
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// NOTE: We specifically search the text for the ID_PREFIX **NOT** including the escapable character
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// This is because that character can be escaped in the text, and lead us to not finding unresolved
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// async helper outputs.
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if (text.search(ID_PREFIX) > 0) {
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return true;
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}
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return false;
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}
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module.exports = {
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done: done,
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hasResolvers: hasResolvers,
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resolve: resolve
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};
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