GN: Make file/dir resolving return errors.

tools/gn/source_dir_unittest.cc

 // Copyright (c) 2013 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/err.h"
 #include "tools/gn/source_dir.h"
 #include "tools/gn/source_file.h"
+#include "tools/gn/value.h"
 
 TEST(SourceDir, ResolveRelativeFile) {
+  Err err;
   SourceDir base("//base/");
 #if defined(OS_WIN)
   base::StringPiece source_root("C:/source/root");
 #else
   base::StringPiece source_root("/source/root");
 #endif
 
   // Empty input is an error.
-  EXPECT_TRUE(base.ResolveRelativeFile("", source_root) == SourceFile());
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, std::string()), &err, source_root) == SourceFile());
+  EXPECT_TRUE(err.has_error());
 
   // These things are directories, so should be an error.
-  EXPECT_TRUE(base.ResolveRelativeFile("//foo/bar/", source_root) ==
-              SourceFile());
-  EXPECT_TRUE(base.ResolveRelativeFile("bar/", source_root) ==
-              SourceFile());
+  err = Err();
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "//foo/bar/"), &err, source_root) == SourceFile());
+  EXPECT_TRUE(err.has_error());
+
+  err = Err();
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "bar/"), &err, source_root) == SourceFile());
+  EXPECT_TRUE(err.has_error());
 
   // Absolute paths should be passed unchanged.
-  EXPECT_TRUE(base.ResolveRelativeFile("//foo",source_root) ==
-              SourceFile("//foo"));
-  EXPECT_TRUE(base.ResolveRelativeFile("/foo", source_root) ==
-              SourceFile("/foo"));
+  err = Err();
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "//foo"), &err, source_root) == SourceFile("//foo"));
+  EXPECT_FALSE(err.has_error());
+
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "/foo"), &err, source_root) == SourceFile("/foo"));
+  EXPECT_FALSE(err.has_error());
 
   // Basic relative stuff.
-  EXPECT_TRUE(base.ResolveRelativeFile("foo", source_root) ==
-              SourceFile("//base/foo"));
-  EXPECT_TRUE(base.ResolveRelativeFile("./foo", source_root) ==
-              SourceFile("//base/foo"));
-  EXPECT_TRUE(base.ResolveRelativeFile("../foo", source_root) ==
-              SourceFile("//foo"));
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "foo"), &err, source_root) == SourceFile("//base/foo"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "./foo"), &err, source_root) == SourceFile("//base/foo"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeFile(
+      Value(nullptr, "../foo"), &err, source_root) == SourceFile("//foo"));
+  EXPECT_FALSE(err.has_error());
 
   // If the given relative path points outside the source root, we
   // expect an absolute path.
 #if defined(OS_WIN)
-  EXPECT_TRUE(base.ResolveRelativeFile("../../foo", source_root) ==
-              SourceFile("/C:/source/foo"));
+  EXPECT_TRUE(base.ResolveRelativeFile(
+          Value(nullptr, "../../foo"), &err, source_root) ==
+      SourceFile("/C:/source/foo"));
+  EXPECT_FALSE(err.has_error());
 #else
-  EXPECT_TRUE(base.ResolveRelativeFile("../../foo", source_root) ==
-              SourceFile("/source/foo"));
+  EXPECT_TRUE(base.ResolveRelativeFile(
+          Value(nullptr, "../../foo"), &err, source_root) ==
+      SourceFile("/source/foo"));
+  EXPECT_FALSE(err.has_error());
 #endif
 
 #if defined(OS_WIN)
   // Note that we don't canonicalize the backslashes to forward slashes.
   // This could potentially be changed in the future which would mean we should
   // just change the expected result.
-  EXPECT_TRUE(base.ResolveRelativeFile("C:\\foo\\bar.txt", source_root) ==
-              SourceFile("/C:/foo/bar.txt"));
+  EXPECT_TRUE(base.ResolveRelativeFile(
+          Value(nullptr, "C:\\foo\\bar.txt"), &err, source_root) ==
+      SourceFile("/C:/foo/bar.txt"));
+  EXPECT_FALSE(err.has_error());
 #endif
 }
 
 TEST(SourceDir, ResolveRelativeDir) {
+  Err err;
   SourceDir base("//base/");
 #if defined(OS_WIN)
   base::StringPiece source_root("C:/source/root");
 #else
   base::StringPiece source_root("/source/root");
 #endif
 
   // Empty input is an error.
-  EXPECT_TRUE(base.ResolveRelativeDir("", source_root) == SourceDir());
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, std::string()), &err, source_root) == SourceDir());
+  EXPECT_TRUE(err.has_error());
 
   // Absolute paths should be passed unchanged.
-  EXPECT_TRUE(base.ResolveRelativeDir("//foo", source_root) ==
-              SourceDir("//foo/"));
-  EXPECT_TRUE(base.ResolveRelativeDir("/foo", source_root) ==
-              SourceDir("/foo/"));
+  err = Err();
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "//foo"), &err, source_root) == SourceDir("//foo/"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "/foo"), &err, source_root) == SourceDir("/foo/"));
+  EXPECT_FALSE(err.has_error());
 
   // Basic relative stuff.
-  EXPECT_TRUE(base.ResolveRelativeDir("foo", source_root) ==
-              SourceDir("//base/foo/"));
-  EXPECT_TRUE(base.ResolveRelativeDir("./foo", source_root) ==
-              SourceDir("//base/foo/"));
-  EXPECT_TRUE(base.ResolveRelativeDir("../foo", source_root) ==
-              SourceDir("//foo/"));
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "foo"), &err, source_root) == SourceDir("//base/foo/"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "./foo"), &err, source_root) == SourceDir("//base/foo/"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "../foo"), &err, source_root) == SourceDir("//foo/"));
+  EXPECT_FALSE(err.has_error());
 
   // If the given relative path points outside the source root, we
   // expect an absolute path.
 #if defined(OS_WIN)
-  EXPECT_TRUE(base.ResolveRelativeDir("../../foo", source_root) ==
-              SourceDir("/C:/source/foo/"));
+  EXPECT_TRUE(base.ResolveRelativeDir(
+          Value(nullptr, "../../foo"), &err, source_root) ==
+      SourceDir("/C:/source/foo/"));
+  EXPECT_FALSE(err.has_error());
 #else
-  EXPECT_TRUE(base.ResolveRelativeDir("../../foo", source_root) ==
-              SourceDir("/source/foo/"));
+  EXPECT_TRUE(base.ResolveRelativeDir(
+          Value(nullptr, "../../foo"), &err, source_root) ==
+      SourceDir("/source/foo/"));
+  EXPECT_FALSE(err.has_error());
 #endif
 
 #if defined(OS_WIN)
   // Canonicalize the existing backslashes to forward slashes and add a
   // leading slash if necessary.
-  EXPECT_TRUE(base.ResolveRelativeDir("\\C:\\foo") == SourceDir("/C:/foo/"));
-  EXPECT_TRUE(base.ResolveRelativeDir("C:\\foo") == SourceDir("/C:/foo/"));
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "\\C:\\foo"), &err) == SourceDir("/C:/foo/"));
+  EXPECT_FALSE(err.has_error());
+  EXPECT_TRUE(base.ResolveRelativeDir(
+      Value(nullptr, "C:\\foo"), &err) == SourceDir("/C:/foo/"));
+  EXPECT_FALSE(err.has_error());
 #endif
 }