// 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 "tools/gn/functions.h"

#include <utility>

#include "base/memory/ptr_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "tools/gn/parse_tree.h"
#include "tools/gn/test_with_scope.h"
#include "tools/gn/value.h"

TEST(Functions, Defined) {
  TestWithScope setup;

  FunctionCallNode function_call;
  Err err;

  // Test an undefined identifier.
  Token undefined_token(Location(), Token::IDENTIFIER, "undef");
  ListNode args_list_identifier_undefined;
  args_list_identifier_undefined.append_item(
      std::unique_ptr<ParseNode>(new IdentifierNode(undefined_token)));
  Value result = functions::RunDefined(setup.scope(), &function_call,
                                       &args_list_identifier_undefined, &err);
  ASSERT_EQ(Value::BOOLEAN, result.type());
  EXPECT_FALSE(result.boolean_value());

  // Define a value that's itself a scope value.
  const char kDef[] = "def";  // Defined variable name.
  setup.scope()->SetValue(
      kDef, Value(nullptr, std::unique_ptr<Scope>(new Scope(setup.scope()))),
      nullptr);

  // Test the defined identifier.
  Token defined_token(Location(), Token::IDENTIFIER, kDef);
  ListNode args_list_identifier_defined;
  args_list_identifier_defined.append_item(
      std::unique_ptr<ParseNode>(new IdentifierNode(defined_token)));
  result = functions::RunDefined(setup.scope(), &function_call,
                                 &args_list_identifier_defined, &err);
  ASSERT_EQ(Value::BOOLEAN, result.type());
  EXPECT_TRUE(result.boolean_value());

  // Should also work by passing an accessor node so you can do
  // "defined(def.foo)" to see if foo is defined on the def scope.
  std::unique_ptr<AccessorNode> undef_accessor(new AccessorNode);
  undef_accessor->set_base(defined_token);
  undef_accessor->set_member(base::MakeUnique<IdentifierNode>(undefined_token));
  ListNode args_list_accessor_defined;
  args_list_accessor_defined.append_item(std::move(undef_accessor));
  result = functions::RunDefined(setup.scope(), &function_call,
                                 &args_list_accessor_defined, &err);
  ASSERT_EQ(Value::BOOLEAN, result.type());
  EXPECT_FALSE(result.boolean_value());
}

// Tests that an error is thrown when a {} is supplied to a function that
// doesn't take one.
TEST(Functions, FunctionsWithBlock) {
  TestWithScope setup;
  Err err;

  // No scope to print() is OK.
  TestParseInput print_no_scope("print(6)");
  EXPECT_FALSE(print_no_scope.has_error());
  Value result = print_no_scope.parsed()->Execute(setup.scope(), &err);
  EXPECT_FALSE(err.has_error());

  // Passing a scope should pass parsing (it doesn't know about what kind of
  // function it is) and then throw an error during execution.
  TestParseInput print_with_scope("print(foo) {}");
  EXPECT_FALSE(print_with_scope.has_error());
  result = print_with_scope.parsed()->Execute(setup.scope(), &err);
  EXPECT_TRUE(err.has_error());
  err = Err();

  // defined() is a special function so test it separately.
  TestParseInput defined_no_scope("defined(foo)");
  EXPECT_FALSE(defined_no_scope.has_error());
  result = defined_no_scope.parsed()->Execute(setup.scope(), &err);
  EXPECT_FALSE(err.has_error());

  // A block to defined should fail.
  TestParseInput defined_with_scope("defined(foo) {}");
  EXPECT_FALSE(defined_with_scope.has_error());
  result = defined_with_scope.parsed()->Execute(setup.scope(), &err);
  EXPECT_TRUE(err.has_error());
}

TEST(Functions, SplitList) {
  TestWithScope setup;

  TestParseInput input(
      // Empty input with varying result items.
      "out1 = split_list([], 1)\n"
      "out2 = split_list([], 3)\n"
      "print(\"empty = $out1 $out2\")\n"

      // One item input.
      "out3 = split_list([1], 1)\n"
      "out4 = split_list([1], 2)\n"
      "print(\"one = $out3 $out4\")\n"

      // Multiple items.
      "out5 = split_list([1, 2, 3, 4, 5, 6, 7, 8, 9], 2)\n"
      "print(\"many = $out5\")\n"

      // Rounding.
      "out6 = split_list([1, 2, 3, 4, 5, 6], 4)\n"
      "print(\"rounding = $out6\")\n"
      );
  ASSERT_FALSE(input.has_error());

  Err err;
  input.parsed()->Execute(setup.scope(), &err);
  ASSERT_FALSE(err.has_error()) << err.message();

  EXPECT_EQ(
      "empty = [[]] [[], [], []]\n"
      "one = [[1]] [[1], []]\n"
      "many = [[1, 2, 3, 4, 5], [6, 7, 8, 9]]\n"
      "rounding = [[1, 2], [3, 4], [5], [6]]\n",
      setup.print_output());
}

TEST(Functions, DeclareArgs) {
  TestWithScope setup;
  Err err;

  // It is not legal to read the value of an argument declared in a
  // declare_args() from inside the call, but outside the call and in
  // a separate call should work.

  TestParseInput reading_from_same_call(R"(
      declare_args() {
        foo = true
        bar = foo
      })");
  reading_from_same_call.parsed()->Execute(setup.scope(), &err);
  ASSERT_TRUE(err.has_error());

  TestParseInput reading_from_outside_call(R"(
      declare_args() {
        foo = true
      }

      bar = foo
      assert(bar)
      )");
  err = Err();
  reading_from_outside_call.parsed()->Execute(setup.scope(), &err);
  ASSERT_FALSE(err.has_error());

  TestParseInput reading_from_different_call(R"(
      declare_args() {
        foo = true
      }

      declare_args() {
        bar = foo
      }

      assert(bar)
      )");
  err = Err();
  TestWithScope setup2;
  reading_from_different_call.parsed()->Execute(setup2.scope(), &err);
  ASSERT_FALSE(err.has_error());
}