text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "testing/gtest/include/gtest/gtest.h"
  #include "tools/gn/input_file.h"
  #include "tools/gn/parse_tree.h"
  #include "tools/gn/scope.h"
  #include "tools/gn/test_with_scope.h"
  
  TEST(ParseTree, Accessor) {
    TestWithScope setup;
  
    // Make a pretend parse node with proper tracking that we can blame for the
    // given value.
    InputFile input_file(SourceFile("//foo"));
    Token base_token(Location(&input_file, 1, 1, 1), Token::IDENTIFIER, "a");
    Token member_token(Location(&input_file, 1, 1, 1), Token::IDENTIFIER, "b");
  
    AccessorNode accessor;
    accessor.set_base(base_token);
  
    scoped_ptr<IdentifierNode> member_identifier(
        new IdentifierNode(member_token));
    accessor.set_member(member_identifier.Pass());
  
    // The access should fail because a is not defined.
    Err err;
    Value result = accessor.Execute(setup.scope(), &err);
    EXPECT_TRUE(err.has_error());
    EXPECT_EQ(Value::NONE, result.type());
  
    // Define a as a Scope. It should still fail because b isn't defined.
    err = Err();
    setup.scope()->SetValue("a",
        Value(NULL, scoped_ptr<Scope>(new Scope(setup.scope()))), NULL);
    result = accessor.Execute(setup.scope(), &err);
    EXPECT_TRUE(err.has_error());
    EXPECT_EQ(Value::NONE, result.type());
  
    // Define b, accessor should succeed now.
    const int64 kBValue = 42;
    err = Err();
    setup.scope()->GetMutableValue("a", false)->scope_value()->SetValue(
        "b", Value(NULL, kBValue), NULL);
    result = accessor.Execute(setup.scope(), &err);
    EXPECT_FALSE(err.has_error());
    ASSERT_EQ(Value::INTEGER, result.type());
    EXPECT_EQ(kBValue, result.int_value());
  }
  
  TEST(ParseTree, BlockUnusedVars) {
    TestWithScope setup;
  
    // Printing both values should be OK.
    TestParseInput input_all_used(
        "{\n"
        "  a = 12\n"
        "  b = 13\n"
        "  print(\"$a $b\")\n"
        "}");
    EXPECT_FALSE(input_all_used.has_error());
  
    Err err;
    input_all_used.parsed()->Execute(setup.scope(), &err);
    EXPECT_FALSE(err.has_error());
  
    // Skipping one should throw an unused var error.
    TestParseInput input_unused(
        "{\n"
        "  a = 12\n"
        "  b = 13\n"
        "  print(\"$a\")\n"
        "}");
    EXPECT_FALSE(input_unused.has_error());
  
    input_unused.parsed()->Execute(setup.scope(), &err);
    EXPECT_TRUE(err.has_error());
  
    // Also verify that the unused variable has the correct origin set. The
    // origin will point to the value assigned to the variable (in this case, the
    // "13" assigned to "b".
    EXPECT_EQ(3, err.location().line_number());
    EXPECT_EQ(7, err.location().char_offset());
  
  }
  
  TEST(ParseTree, OriginForDereference) {
    TestWithScope setup;
    TestParseInput input(
        "a = 6\n"
        "get_target_outputs(a)");
    EXPECT_FALSE(input.has_error());
  
    Err err;
    input.parsed()->Execute(setup.scope(), &err);
    EXPECT_TRUE(err.has_error());
  
    // The origin for the "not a string" error message should be where the value
    // was dereferenced (the "a" on the second line).
    EXPECT_EQ(2, err.location().line_number());
    EXPECT_EQ(20, err.location().char_offset());
  }
  