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