repl: add mode detection, cli persistent history

this creates a new internal module responsible for providing
the repl created via "iojs" or "iojs -i," and adds the following
options to the readline and repl subsystems:

* "repl mode" - determine whether a repl is strict mode, sloppy mode,
  or auto-detect mode.
* historySize - determine the maximum number of lines a repl will store
  as history.

The built-in repl gains persistent history support when the
NODE_REPL_HISTORY_FILE environment variable is set. This functionality
is not exposed to userland repl instances.

PR-URL: https://github.com/iojs/io.js/pull/1513
Reviewed-By: Fedor Indutny <fedor@indutny.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/test/parallel/test-repl-mode.js b/test/parallel/test-repl-mode.js
new file mode 100644
index 0000000000..b71e213647
--- /dev/null
+++ b/test/parallel/test-repl-mode.js
@@ -0,0 +1,84 @@
+var common = require('../common');
+var assert = require('assert');
+var Stream = require('stream');
+var repl = require('repl');
+
+common.globalCheck = false;
+
+var tests = [
+  testSloppyMode,
+  testStrictMode,
+  testAutoMode
+];
+
+tests.forEach(function(test) {
+  test();
+});
+
+function testSloppyMode() {
+  var cli = initRepl(repl.REPL_MODE_SLOPPY);
+
+  cli.input.emit('data', `
+    x = 3
+  `.trim() + '\n');
+  assert.equal(cli.output.accumulator.join(''), '> 3\n> ')
+  cli.output.accumulator.length = 0;
+
+  cli.input.emit('data', `
+    let y = 3
+  `.trim() + '\n');
+  assert.ok(/SyntaxError: Block-scoped/.test(
+      cli.output.accumulator.join('')));
+}
+
+function testStrictMode() {
+  var cli = initRepl(repl.REPL_MODE_STRICT);
+
+  cli.input.emit('data', `
+    x = 3
+  `.trim() + '\n');
+  assert.ok(/ReferenceError: x is not defined/.test(
+      cli.output.accumulator.join('')));
+  cli.output.accumulator.length = 0;
+
+  cli.input.emit('data', `
+    let y = 3
+  `.trim() + '\n');
+  assert.equal(cli.output.accumulator.join(''), 'undefined\n> ');
+}
+
+function testAutoMode() {
+  var cli = initRepl(repl.REPL_MODE_MAGIC);
+
+  cli.input.emit('data', `
+    x = 3
+  `.trim() + '\n');
+  assert.equal(cli.output.accumulator.join(''), '> 3\n> ')
+  cli.output.accumulator.length = 0;
+
+  cli.input.emit('data', `
+    let y = 3
+  `.trim() + '\n');
+  assert.equal(cli.output.accumulator.join(''), 'undefined\n> ');
+}
+
+function initRepl(mode) {
+  var input = new Stream();
+  input.write = input.pause = input.resume = function(){};
+  input.readable = true;
+
+  var output = new Stream();
+  output.write = output.pause = output.resume = function(buf) {
+    output.accumulator.push(buf);
+  };
+  output.accumulator = [];
+  output.writable = true;
+
+  return repl.start({
+    input: input,
+    output: output,
+    useColors: false,
+    terminal: false,
+    replMode: mode
+  });
+}