Add directory extraction to GN path handling.

tools/gn/file_template_unittest.cc

Index: tools/gn/file_template_unittest.cc
diff --git a/tools/gn/file_template_unittest.cc b/tools/gn/file_template_unittest.cc
index 8e3bf40b90c4b22850f532726b1e83c3407af3be..d10791eeb4fc9fe0e9614edf578f27af558e7765 100644
--- a/tools/gn/file_template_unittest.cc
+++ b/tools/gn/file_template_unittest.cc
@@ -7,58 +7,62 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/escape.h"
 #include "tools/gn/file_template.h"
+#include "tools/gn/test_with_scope.h"
 
 TEST(FileTemplate, Static) {
+  TestWithScope setup;
+
   std::vector<std::string> templates;
   templates.push_back("something_static");
-  FileTemplate t(templates);
+  FileTemplate t(setup.settings(), templates);
   EXPECT_FALSE(t.has_substitutions());
 
   std::vector<std::string> result;
-  t.ApplyString("", &result);
-  ASSERT_EQ(1u, result.size());
-  EXPECT_EQ("something_static", result[0]);
-
-  result.clear();
-  t.ApplyString("lalala", &result);
+  t.Apply(SourceFile("//foo/bar"), &result);
   ASSERT_EQ(1u, result.size());
   EXPECT_EQ("something_static", result[0]);
 }
 
 TEST(FileTemplate, Typical) {
+  TestWithScope setup;
+
   std::vector<std::string> templates;
   templates.push_back("foo/{{source_name_part}}.cc");
   templates.push_back("foo/{{source_name_part}}.h");
-  FileTemplate t(templates);
+  FileTemplate t(setup.settings(), templates);
   EXPECT_TRUE(t.has_substitutions());
 
   std::vector<std::string> result;
-  t.ApplyString("sources/ha.idl", &result);
+  t.Apply(SourceFile("//sources/ha.idl"), &result);
   ASSERT_EQ(2u, result.size());
   EXPECT_EQ("foo/ha.cc", result[0]);
   EXPECT_EQ("foo/ha.h", result[1]);
 }
 
 TEST(FileTemplate, Weird) {
+  TestWithScope setup;
+
   std::vector<std::string> templates;
   templates.push_back("{{{source}}{{source}}{{");
-  FileTemplate t(templates);
+  FileTemplate t(setup.settings(), templates);
   EXPECT_TRUE(t.has_substitutions());
 
   std::vector<std::string> result;
-  t.ApplyString("foo/lalala.c", &result);
+  t.Apply(SourceFile("//foo/lalala.c"), &result);
   ASSERT_EQ(1u, result.size());
-  EXPECT_EQ("{foo/lalala.cfoo/lalala.c{{", result[0]);
+  EXPECT_EQ("{../../foo/lalala.c../../foo/lalala.c{{", result[0]);
 }
 
 TEST(FileTemplate, NinjaExpansions) {
+  TestWithScope setup;
+
   std::vector<std::string> templates;
   templates.push_back("-i");
   templates.push_back("{{source}}");
   templates.push_back("--out=foo bar\"{{source_name_part}}\".o");
   templates.push_back("");  // Test empty string.
 
-  FileTemplate t(templates);
+  FileTemplate t(setup.settings(), templates);
 
   std::ostringstream out;
   t.WriteWithNinjaExpansions(out);
@@ -79,21 +83,64 @@ TEST(FileTemplate, NinjaExpansions) {
 }
 
 TEST(FileTemplate, NinjaVariables) {
+  TestWithScope setup;
+
   std::vector<std::string> templates;
   templates.push_back("-i");
   templates.push_back("{{source}}");
   templates.push_back("--out=foo bar\"{{source_name_part}}\".o");
+  templates.push_back("{{source_file_part}}");
+  templates.push_back("{{source_dir}}");
+  templates.push_back("{{source_root_relative_dir}}");
+  templates.push_back("{{source_gen_dir}}");
+  templates.push_back("{{source_out_dir}}");
 
-  FileTemplate t(templates);
+  FileTemplate t(setup.settings(), templates);
 
   std::ostringstream out;
   EscapeOptions options;
   options.mode = ESCAPE_NINJA_COMMAND;
-  t.WriteNinjaVariablesForSubstitution(out, "../../foo/bar.txt", options);
+  t.WriteNinjaVariablesForSubstitution(out, setup.settings(),
+                                       SourceFile("//foo/bar.txt"), options);
 
   // Just the variables used above should be written.
   EXPECT_EQ(
       "  source = ../../foo/bar.txt\n"
-      "  source_name_part = bar\n",
+      "  source_name_part = bar\n"
+      "  source_file_part = bar.txt\n"
+      "  source_dir = ../../foo\n"
+      "  source_root_rel_dir = foo\n"
+      "  source_gen_dir = gen/foo\n"
+      "  source_out_dir = obj/foo\n",
       out.str());
 }
+
+// Tests in isolation different types of substitutions and that the right
+// things are generated.
+TEST(FileTemplate, Substitutions) {
+  TestWithScope setup;
+
+  #define GetSubst(str, what) \
+      FileTemplate::GetSubstitution(setup.settings(), \
+                                    SourceFile(str), \
+                                    FileTemplate::Subrange::what)
+
+  // Try all possible templates with a normal looking string.
+  EXPECT_EQ("../../foo/bar/baz.txt", GetSubst("//foo/bar/baz.txt", SOURCE));
+  EXPECT_EQ("baz", GetSubst("//foo/bar/baz.txt", NAME_PART));
+  EXPECT_EQ("baz.txt", GetSubst("//foo/bar/baz.txt", FILE_PART));
+  EXPECT_EQ("../../foo/bar", GetSubst("//foo/bar/baz.txt", SOURCE_DIR));
+  EXPECT_EQ("foo/bar", GetSubst("//foo/bar/baz.txt", ROOT_RELATIVE_DIR));
+  EXPECT_EQ("gen/foo/bar", GetSubst("//foo/bar/baz.txt", SOURCE_GEN_DIR));
+  EXPECT_EQ("obj/foo/bar", GetSubst("//foo/bar/baz.txt", SOURCE_OUT_DIR));
+
+  // Operations on an absolute path.
+  EXPECT_EQ("/baz.txt", GetSubst("/baz.txt", SOURCE));
+  EXPECT_EQ("/.", GetSubst("/baz.txt", SOURCE_DIR));
+  EXPECT_EQ("gen", GetSubst("/baz.txt", SOURCE_GEN_DIR));
+  EXPECT_EQ("obj", GetSubst("/baz.txt", SOURCE_OUT_DIR));
+
+  EXPECT_EQ(".", GetSubst("//baz.txt", ROOT_RELATIVE_DIR));
+
+  #undef GetSubst
+}