Enhance GN diagnostic tools

tools/gn/label_pattern_unittest.cc

+// 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/err.h"
+#include "tools/gn/label_pattern.h"
+#include "tools/gn/value.h"
+
+namespace {
+
+struct PatternCase {
+  const char* input;
+  bool success;
+
+  LabelPattern::Type type;
+  const char* dir;
+  const char* name;
+  const char* toolchain;
+};
+
+}  // namespace
+
+TEST(LabelPattern, PatternParse) {
+  SourceDir current_dir("//foo/");
+  PatternCase cases[] = {
+    // Missing stuff.
+    { "", false, LabelPattern::MATCH, "", "", "" },
+    { ":", false, LabelPattern::MATCH, "", "", "" },
+    // Normal things.
+    { ":bar", true, LabelPattern::MATCH, "//foo/", "bar", "" },
+    { "//la:bar", true, LabelPattern::MATCH, "//la/", "bar", "" },
+    { "*", true, LabelPattern::RECURSIVE_DIRECTORY, "", "", "" },
+    { ":*", true, LabelPattern::DIRECTORY, "//foo/", "", "" },
+    { "la:*", true, LabelPattern::DIRECTORY, "//foo/la/", "", "" },
+    { "la/*:*", true, LabelPattern::RECURSIVE_DIRECTORY, "//foo/la/", "", "" },
+    { "//la:*", true, LabelPattern::DIRECTORY, "//la/", "", "" },
+    { "./*", true, LabelPattern::RECURSIVE_DIRECTORY, "//foo/", "", "" },
+    { "foo/*", true, LabelPattern::RECURSIVE_DIRECTORY, "//foo/foo/", "", "" },
+    { "//l/*", true, LabelPattern::RECURSIVE_DIRECTORY, "//l/", "", "" },
+    // Toolchains.
+    { "//foo()", true, LabelPattern::MATCH, "//foo/", "foo", "" },
+    { "//foo(//bar)", true, LabelPattern::MATCH, "//foo/", "foo", "//bar:bar" },
+    { "//foo:*(//bar)", true, LabelPattern::DIRECTORY, "//foo/", "",
+      "//bar:bar" },
+    { "//foo/*(//bar)", true, LabelPattern::RECURSIVE_DIRECTORY, "//foo/", "",
+      "//bar:bar" },
+    // Wildcards in invalid places.
+    { "*foo*:bar", false, LabelPattern::MATCH, "", "", "" },
+    { "foo*:*bar", false, LabelPattern::MATCH, "", "", "" },
+    { "*foo:bar", false, LabelPattern::MATCH, "", "", "" },
+    { "foo:bar*", false, LabelPattern::MATCH, "", "", "" },
+    { "*:*", true, LabelPattern::RECURSIVE_DIRECTORY, "", "", "" },
+    // Invalid toolchain stuff.
+    { "//foo(//foo/bar:*)", false, LabelPattern::MATCH, "", "", "" },
+    { "//foo/*(*)", false, LabelPattern::MATCH, "", "", "" },
+    { "//foo(//bar", false, LabelPattern::MATCH, "", "", "" },
+  };
+
+  for (size_t i = 0; i < arraysize(cases); i++) {
+    const PatternCase& cur = cases[i];
+    Err err;
+    LabelPattern result =
+        LabelPattern::GetPattern(current_dir, Value(NULL, cur.input), &err);
+
+    EXPECT_EQ(cur.success, !err.has_error()) << i << " " << cur.input;
+    EXPECT_EQ(cur.type, result.type()) << i << " " << cur.input;
+    EXPECT_EQ(cur.dir, result.dir().value()) << i << " " << cur.input;
+    EXPECT_EQ(cur.name, result.name()) << i << " " << cur.input;
+    EXPECT_EQ(cur.toolchain, result.toolchain().GetUserVisibleName(false))
+        << i << " " << cur.input;
+  }
+}