/
load_node_builder.js
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/
load_node_builder.js
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var keys = require("lodash/keys");
var through = require("through2");
var assign = require("lodash/assign");
module.exports = function() {
return through.obj(function(data, enc, next) {
loadNodeBuilder(data)
.then(function(newGraph) {
next(null, assign(data, { graph: newGraph }));
})
.catch(next);
});
};
/**
* Replaces a node source with its builder module
* @param {Object} data - The stream's data object
* @return {Promise.<graph>}
*/
function loadNodeBuilder(data) {
return new Promise(function(resolve, reject) {
var graph = data.graph;
var loader = data.loader;
var promises = keys(graph).map(function(nodeName) {
var node = graph[nodeName];
// pluginBuilder | extensionBuilder is a module identifier that
// should be loaded to replace the node's source during the build
var nodeBuilder =
node.value && (node.value.pluginBuilder || node.value.extensionBuilder);
// nothing to do in this case, return right away
if (!nodeBuilder) return;
return loader
.normalize(nodeBuilder)
.then(locate)
.then(_fetch)
.then(makeReplace(node));
});
function locate(name) {
return Promise.all([name, loader.locate({ name: name, metadata: {} })]);
}
// [ name, address ]
function _fetch(data) {
return Promise.all([
data[1],
loader.fetch({ name: data[0], address: data[1], metadata: {} })
]);
}
function makeReplace(node) {
// [ address, load ]
return function replace(data) {
node.load = assign(node.load, {
address: data[0],
source: data[1],
metadata: {}
});
};
}
Promise.all(promises)
.then(function() {
resolve(graph);
})
.catch(reject);
});
}