chushihua

node_modules/bfj-node4/src/stringify.js

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+'use strict'
+
+const promise = require('./promise')
+const streamify = require('./streamify')
+
+module.exports = stringify
+
+/**
+ * Public function `stringify`.
+ *
+ * Returns a promise and asynchronously serialises a data structure to a
+ * JSON string. Sanely handles promises, buffers, maps and other iterables.
+ *
+ * @param data:         The data to transform
+ *
+ * @option space:       Indentation string, or the number of spaces
+ *                      to indent each nested level by.
+ *
+ * @option promises:    'resolve' or 'ignore', default is 'resolve'.
+ *
+ * @option buffers:     'toString' or 'ignore', default is 'toString'.
+ *
+ * @option maps:        'object' or 'ignore', default is 'object'.
+ *
+ * @option iterables:   'array' or 'ignore', default is 'array'.
+ *
+ * @option circular:    'error' or 'ignore', default is 'error'.
+ *
+ * @option yieldRate:    The number of data items to process per timeslice,
+ *                       default is 16384.
+ *
+ * @option bufferLength: The length of the buffer, default is 1024.
+ *
+ * @option Promise:      The promise constructor to use, defaults to bluebird.
+ **/
+function stringify (data, options) {
+  const json = []
+  const Promise = promise(options)
+  const stream = streamify(data, options)
+
+  let resolve, reject
+
+  stream.on('data', read)
+  stream.on('end', end)
+  stream.on('dataError', error)
+
+  return new Promise((res, rej) => {
+    resolve = res
+    reject = rej
+  })
+
+  function read (chunk) {
+    json.push(chunk)
+  }
+
+  function end () {
+    resolve(json.join(''))
+  }
+
+  function error (e) {
+    reject(e)
+  }
+}