60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
var Promise = require('promise');
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var through = require('through2');
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var gutil = require('gulp-util');
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var PluginError = gutil.PluginError;
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const PLUGIN_NAME = 'gulp-json-transform';
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function jsonPromiseParse(rawStr) {
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return new Promise(function(resolve, reject) {
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var json;
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try {
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json = JSON.parse(rawStr);
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} catch (e) {
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return reject(new Error('Invalid JSON: ' + e.message));
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}
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resolve(json);
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});
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}
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module.exports = function(transformFn, jsonSpace) {
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if (!transformFn) {
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throw new PluginError(PLUGIN_NAME, 'Missing transform function!');
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}
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return through.obj(function(file, enc, cb) {
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var self = this;
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if (file.isStream()) {
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return self.emit('error', new PluginError(PLUGIN_NAME, 'Streaming not supported'));
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}
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if (file.isBuffer()) {
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var fileContent = file.contents.toString(enc);
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jsonPromiseParse(fileContent)
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.then(function(data){
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return transformFn(data, {
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path: file.path,
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relative: file.relative,
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base: file.base
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});
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})
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.then(function(output) {
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var isString = (typeof output === 'string');
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file.contents = new Buffer(isString ? output : JSON.stringify(output, null, jsonSpace));
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self.push(file);
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cb();
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})
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.catch(function(e) {
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gutil.log(PLUGIN_NAME + ':', gutil.colors.red(e.message));
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self.emit('error', new PluginError(PLUGIN_NAME, e));
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self.emit('end');
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});
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}
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});
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};
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