Implement ES6 Template Literals

test/mjsunit/es6/templates.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-templates
+
+var num = 5;
+var str = "str";
+function fn() { return "result"; }
+var obj = {
+  num: num,
+  str: str,
+  fn: function() { return "result"; }
+};
+
+// Basic expressions
+assertEquals("foo 5 bar", `foo ${num} bar`);
+assertEquals("foo str bar", `foo ${str} bar`);
+assertEquals("foo [object Object] bar", `foo ${obj} bar`);
+assertEquals("foo result bar", `foo ${fn()} bar`);
+assertEquals("foo 5 bar", `foo ${obj.num} bar`);
+assertEquals("foo str bar", `foo ${obj.str} bar`);
+assertEquals("foo result bar", `foo ${obj.fn()} bar`);
+
+// Expressions containing templates
+assertEquals("foo bar 5", `foo ${`bar ${num}`}`);
+
+// Multi-line templates
+assertEquals("foo\n  bar\n  baz", `foo
+  bar
+  baz`);
+
+// Tagged Templates
+
+// assert tag is invoked
+var called = false;
+(function(s) {
+  called = true;
+})`test`;
+assertTrue(called);
+
+called = false;
+// assert tag is invoked in right context
+obj = {
+  fn: function() {
+    called = true;
+    assertEquals(obj, this);
+  }
+};
+
+obj.fn`test`;
+assertTrue(called);
+
+// Simple templates only have a callSiteObj
+(function(s) {
+  assertEquals(1, arguments.length);
+})`test`;
+
+// Templates containing expressions have the values of evaluated expressions
+(function(site, n, s, o, f, r) {
+  assertEquals(6, arguments.length);
+  assertEquals("number", typeof n);
+  assertEquals("string", typeof s);
+  assertEquals("object", typeof o);
+  assertEquals("function", typeof f);
+  assertEquals("result", r);
+})`${num}${str}${obj}${fn}${fn()}`;
+
+// The TV and TRV of NoSubstitutionTemplate :: `` is the empty code unit sequence.
+(function(s) {
+  assertEquals(1, s.length);
+  assertEquals(1, s.raw.length);
+  assertEquals("", s[0]);
+
+  // Failure: expected <""> found <"foo  barfoo  barfoo foo foo foo testtest">
+  // assertEquals("", s.raw[0]);

[caitp (gmail), 2014/11/01 03:33:55]

If I could get some help with this, that would be good. It's not super clear to
me why the raw value seems to contain a bunch of old gunk. Will look at it again
in a bit

[caitp (gmail), 2014/11/01 04:34:21]

Nevermind, it was a mistake in the scanner, easily fixed.

+})``;
+
+// The TV and TRV of TemplateHead :: `${ is the empty code unit sequence.
+(function(s) {
+  assertEquals(2, s.length);
+  assertEquals(2, s.raw.length);
+  assertEquals("", s[0]);
+
+  // Failure: expected <""> found <"foo  barfoo  barfoo foo foo foo testtest">
+  // assertEquals("", s.raw[0]);
+})`${1}`;
+
+// The TV and TRV of TemplateMiddle :: }${ is the empty code unit sequence.
+(function(s) {
+  assertEquals(3, s.length);
+  assertEquals(3, s.raw.length);
+  assertEquals("", s[1]);
+
+  // Failure: expected <""> found <"foo  barfoo  barfoo foo foo foo testtest">
+  // assertEquals("", s.raw[1]);
+})`${1}${2}`;
+
+// The TV and TRV of TemplateTail :: }` is the empty code unit sequence.
+(function(s) {
+  assertEquals(2, s.length);
+  assertEquals(2, s.raw.length);
+  assertEquals("", s[1]);
+
+  // Failure: expected <""> found <"foo  barfoo  barfoo foo foo foo testtest">
+  // assertEquals("", s.raw[1]);
+})`${1}`;
+
+// The TV of NoSubstitutionTemplate :: ` TemplateCharacters ` is the TV of
+// TemplateCharacters.
+(function(s) { assertEquals("foo", s[0]); })`foo`;
+
+// The TV of TemplateHead :: ` TemplateCharacters ${ is the TV of
+// TemplateCharacters.
+(function(s) { assertEquals("foo", s[0]); })`foo${1}`;
+
+// The TV of TemplateMiddle :: } TemplateCharacters ${ is the TV of
+// TemplateCharacters.
+(function(s) { assertEquals("foo", s[1]); })`${1}foo${2}`;
+
+// The TV of TemplateTail :: } TemplateCharacters ` is the TV of
+// TemplateCharacters.
+(function(s) { assertEquals("foo", s[1]); })`${1}foo`;
+
+// The TV of TemplateCharacters :: TemplateCharacter is the TV of
+// TemplateCharacter.
+(function(s) { assertEquals("f", s[0]); })`f`;
+
+// The TV of TemplateCharacter :: $ is the code unit value 0x0024.
+(function(s) { assertEquals("$", s[0]); })`$`;
+
+// The TV of TemplateCharacter :: \ EscapeSequence is the CV of EscapeSequence.
+(function(s) { assertEquals("안녕", s[0]); })`\uc548\uB155`;
+(function(s) { assertEquals("\xff", s[0]); })`\xff`;
+(function(s) { assertEquals("\n", s[0]); })`\n`;
+
+// The TV of TemplateCharacter :: LineContinuation is the TV of
+// LineContinuation. The TV of LineContinuation :: \ LineTerminatorSequence is
+// the empty code unit sequence.
+(function(s) { assertEquals("", s[0]); })`\
+
+`;
+
+// TODO(caitp): add test cases for TRV values once TRV is working correctly
+// (see failures commented out above).
+