Add support for substring replacement in gypi_to_gn

skia/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 if (cpu_arch == "arm") {
   import("//build/config/arm.gni")
 }
 
 skia_support_gpu = !is_ios
 skia_support_pdf = !is_ios && enable_printing != 0
 
 # The list of Skia files is kept in skia_gn_files.gypi. Read it.
-gypi_values = exec_script("//build/gypi_to_gn.py",
-                          [ rebase_path("skia_gn_files.gypi") ],
-                          "scope",
-                          [ "skia_gn_files.gypi" ])
-
-# This files in the skia gypi file are relative to this directory.
-skia_dir = "//third_party/skia"
-
-# Same as skia_dir but relative to the current directory. This is what all
-# files will be prefixed to once we rebase them to be relative to our file. If
-# you need to filter out a file, prefix it with $skia_rel_dir.
-skia_rel_dir = rebase_path(".", ".", skia_dir)
+gypi_values = exec_script(
+    "//build/gypi_to_gn.py",
+    [ rebase_path("skia_gn_files.gypi"),
+      "--replace=<(skia_include_path)=//third_party/skia/include",
+      "--replace=<(skia_src_path)=//third_party/skia/src" ]
+    "scope",
+    [ "skia_gn_files.gypi" ])
 
 # External-facing config for dependent code.
 config("skia_config") {
   include_dirs = [
     "config",
     "ext",
     "//third_party/skia/include/config",
     "//third_party/skia/include/core",
     "//third_party/skia/include/effects",
     "//third_party/skia/include/images",
@@ skipping 178 matching lines @@
     "ext/skia_utils_win.cc",
     "ext/skia_utils_win.h",
     "ext/vector_canvas.h",
     "ext/vector_platform_device_emf_win.cc",
     "ext/vector_platform_device_emf_win.h",
     "ext/vector_platform_device_skia.cc",
     "ext/vector_platform_device_skia.h",
   ]
 
   # The skia gypi values are relative to the skia_dir, so we need to rebase.
-  sources += rebase_path(gypi_values.skia_core_sources, ".", skia_dir)
-  sources += rebase_path(gypi_values.skia_effects_sources, ".", skia_dir)
-  sources += rebase_path(gypi_values.skia_pdf_sources, ".", skia_dir)
-  sources += rebase_path(gypi_values.skia_library_sources, ".", skia_dir)
+  sources += gypi_values.skia_core_sources
+  sources += gypi_values.skia_effects_sources
+  sources += gypi_values.skia_pdf_sources
+  sources += gypi_values.skia_library_sources
 
   # GPU
   if (skia_support_gpu) {
-    sources += rebase_path(gypi_values.skia_gpu_sources, ".", skia_dir)
+    sources += gypi_values.skia_gpu_sources
   }
 
   # Fixup Chrome sources.
   if (is_posix) {
     sources -= [ "ext/SkThread_chrome.cc" ]
   }
   if (is_ios) {
     sources -= [ "ext/vector_platform_device_skia.cc" ]
   }
   if (is_win) {
     sources -= [ "ext/SkThread_chrome.cc" ]
   }
   if (is_android && enable_printing == 0) {
     sources -= [
       "ext/skia_utils_base.cc",
       "ext/vector_platform_device_skia.cc"
     ]
   }
 
   # Fixup skia library sources.
   if (is_win) {
     sources -= [
-      "$skia_rel_dir/src/ports/SkOSFile_posix.cpp",
-      "$skia_rel_dir/src/ports/SkTime_Unix.cpp",
-      "$skia_rel_dir/src/ports/SkTLS_pthread.cpp",
-      "$skia_rel_dir/src/ports/SkFontConfigInterface_direct.cpp",
-      "$skia_rel_dir/src/fonts/SkFontMgr_fontconfig.cpp",
+      "//third_party/skia/src/ports/SkOSFile_posix.cpp",
+      "//third_party/skia/src/ports/SkTime_Unix.cpp",
+      "//third_party/skia/src/ports/SkTLS_pthread.cpp",
+      "//third_party/skia/src/ports/SkFontConfigInterface_direct.cpp",
+      "//third_party/skia/src/fonts/SkFontMgr_fontconfig.cpp",
     ]
   } else {
     sources -= [
-      "$skia_rel_dir/src/ports/SkFontHost_win.cpp",
-      "$skia_rel_dir/src/ports/SkFontHost_win_dw.cpp",
-      "$skia_rel_dir/src/ports/SkFontMgr_default_gdi.cpp",
-      "$skia_rel_dir/src/ports/SkOSFile_win.cpp",
-      "$skia_rel_dir/src/ports/SkThread_win.cpp",
-      "$skia_rel_dir/src/ports/SkTLS_win.cpp",
-      "$skia_rel_dir/src/utils/SkThreadUtils_win.cpp",
+      "//third_party/skia/src/ports/SkFontHost_win.cpp",
+      "//third_party/skia/src/ports/SkFontHost_win_dw.cpp",
+      "//third_party/skia/src/ports/SkFontMgr_default_gdi.cpp",
+      "//third_party/skia/src/ports/SkOSFile_win.cpp",
+      "//third_party/skia/src/ports/SkThread_win.cpp",
+      "//third_party/skia/src/ports/SkTLS_win.cpp",
+      "//third_party/skia/src/utils/SkThreadUtils_win.cpp",
     ]
   }
   if (!is_android) {
     sources -= [
-      "$skia_rel_dir/src/ports/SkFontConfigInterface_android.cpp",
-      "$skia_rel_dir/src/ports/SkFontConfigParser_android.cpp",
+      "//third_party/skia/src/ports/SkFontConfigInterface_android.cpp",
+      "//third_party/skia/src/ports/SkFontConfigParser_android.cpp",
     ]
   }
   if (!is_mac) {
     sources -= [
-      "$skia_rel_dir/src/ports/SkFontHost_mac.cpp",
-      "$skia_rel_dir/src/utils/SkThreadUtils_pthread_mach.cpp",
+      "//third_party/skia/src/ports/SkFontHost_mac.cpp",
+      "//third_party/skia/src/utils/SkThreadUtils_pthread_mach.cpp",
     ]
   }
   if (!is_linux) {
     sources -= [
-      "$skia_rel_dir/src/ports/SkFontHost_FreeType.cpp",
-      "$skia_rel_dir/src/ports/SkFontHost_FreeType_common.cpp",
-      "$skia_rel_dir/src/ports/SkFontHost_fontconfig.cpp",
-      "$skia_rel_dir/src/ports/SkFontHost_linux.cpp",
+      "//third_party/skia/src/ports/SkFontHost_FreeType.cpp",
+      "//third_party/skia/src/ports/SkFontHost_FreeType_common.cpp",
+      "//third_party/skia/src/ports/SkFontHost_fontconfig.cpp",
+      "//third_party/skia/src/ports/SkFontHost_linux.cpp",
     ]
   } else if (!is_android) {
     sources -= [
-      "$skia_rel_dir/src/ports/SkFontConfigInterface_direct.cpp",
-      "$skia_rel_dir/src/fonts/SkFontMgr_fontconfig.cpp",
+      "//third_party/skia/src/ports/SkFontConfigInterface_direct.cpp",
+      "//third_party/skia/src/fonts/SkFontMgr_fontconfig.cpp",
     ]
   }
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_library_config",
     "//build/config/compiler:no_chromium_code"
   ]
   direct_dependent_configs = [ ":skia_config" ]
 
@@ skipping 55 matching lines @@
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":skia_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   # TODO(brettw) uncomment when visibility is supported.
   #visibility = ":skia"
 }