planning

node_modules/micromark/lib/stream.mjs

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+export default stream
+
+import {EventEmitter} from 'events'
+import compiler from './compile/html.mjs'
+import parser from './parse.mjs'
+import postprocess from './postprocess.mjs'
+import preprocessor from './preprocess.mjs'
+
+function stream(options) {
+  var preprocess = preprocessor()
+  var tokenize = parser(options).document().write
+  var compile = compiler(options)
+  var emitter = new EventEmitter()
+  var ended
+
+  emitter.writable = emitter.readable = true
+  emitter.write = write
+  emitter.end = end
+  emitter.pipe = pipe
+
+  return emitter
+
+  // Write a chunk into memory.
+  function write(chunk, encoding, callback) {
+    if (typeof encoding === 'function') {
+      callback = encoding
+      encoding = undefined
+    }
+
+    if (ended) {
+      throw new Error('Did not expect `write` after `end`')
+    }
+
+    tokenize(preprocess(chunk || '', encoding))
+
+    if (callback) {
+      callback()
+    }
+
+    // Signal succesful write.
+    return true
+  }
+
+  // End the writing.
+  // Passes all arguments to a final `write`.
+  function end(chunk, encoding, callback) {
+    write(chunk, encoding, callback)
+
+    emitter.emit(
+      'data',
+      compile(postprocess(tokenize(preprocess('', encoding, true))))
+    )
+
+    emitter.emit('end')
+    ended = true
+    return true
+  }
+
+  // Pipe the processor into a writable stream.
+  // Basically `Stream#pipe`, but inlined and simplified to keep the bundled
+  // size down.
+  // See: <https://github.com/nodejs/node/blob/43a5170/lib/internal/streams/legacy.js#L13>.
+  function pipe(dest, options) {
+    emitter.on('data', ondata)
+    emitter.on('error', onerror)
+    emitter.on('end', cleanup)
+    emitter.on('close', cleanup)
+
+    // If the `end` option is not supplied, `dest.end()` will be called when the
+    // `end` or `close` events are received.
+    if (!dest._isStdio && (!options || options.end !== false)) {
+      emitter.on('end', onend)
+    }
+
+    dest.on('error', onerror)
+    dest.on('close', cleanup)
+
+    dest.emit('pipe', emitter)
+
+    return dest
+
+    // End destination.
+    function onend() {
+      if (dest.end) {
+        dest.end()
+      }
+    }
+
+    // Handle data.
+    function ondata(chunk) {
+      if (dest.writable) {
+        dest.write(chunk)
+      }
+    }
+
+    // Clean listeners.
+    function cleanup() {
+      emitter.removeListener('data', ondata)
+      emitter.removeListener('end', onend)
+      emitter.removeListener('error', onerror)
+      emitter.removeListener('end', cleanup)
+      emitter.removeListener('close', cleanup)
+
+      dest.removeListener('error', onerror)
+      dest.removeListener('close', cleanup)
+    }
+
+    // Close dangling pipes and handle unheard errors.
+    function onerror(error) {
+      cleanup()
+
+      if (!emitter.listenerCount('error')) {
+        throw error // Unhandled stream error in pipe.
+      }
+    }
+  }
+}