Port "Eclipse CDT settings" file generation from GYP to GN

tools/gn/eclipse_writer.cc

Index: tools/gn/eclipse_writer.cc
diff --git a/tools/gn/eclipse_writer.cc b/tools/gn/eclipse_writer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e38e24711daca5498eef1e943185c3996bfad2bd
--- /dev/null
+++ b/tools/gn/eclipse_writer.cc
@@ -0,0 +1,172 @@
+// Copyright 2016 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/eclipse_writer.h"
+
+#include <fstream>
+
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "tools/gn/builder.h"
+#include "tools/gn/config_values_extractors.h"
+#include "tools/gn/filesystem_utils.h"
+#include "tools/gn/loader.h"
+#include "tools/gn/xml_element_writer.h"
+
+namespace {
+
+// Escapes |unescaped| for use in XML element content.
+std::string EscapeForXML(const std::string& unescaped) {
+  std::string result;
+  result.reserve(unescaped.length());
+  for (const char c : unescaped) {
+    if (c == '<')
+      result += "&lt;";
+    else if (c == '>')
+      result += "&gt;";
+    else if (c == '&')
+      result += "&amp;";
+    else
+      result.push_back(c);
+  }
+  return result;
+}
+
+}  // namespace
+
+EclipseWriter::EclipseWriter(const BuildSettings* build_settings,
+                             const Builder* builder,
+                             std::ostream& out)
+    : build_settings_(build_settings), builder_(builder), out_(out) {
+  languages_.push_back("C++ Source File");
+  languages_.push_back("C Source File");
+  languages_.push_back("Assembly Source File");
+  languages_.push_back("GNU C++");
+  languages_.push_back("GNU C");
+  languages_.push_back("Assembly");
+}
+
+EclipseWriter::~EclipseWriter() {}
+
+// static
+bool EclipseWriter::RunAndWriteFile(
+    const BuildSettings* build_settings,
+    const Builder* builder,
+    Err* err) {
+  base::FilePath file = build_settings->GetFullPath(build_settings->build_dir())
+                            .AppendASCII("eclipse-cdt-settings.xml");
+  std::ofstream file_out;
+  file_out.open(FilePathToUTF8(file).c_str(),
+                std::ios_base::out | std::ios_base::binary);
+  if (file_out.fail()) {
+    *err =
+        Err(Location(), "Couldn't open eclipse-cdt-settings.xml for writing");
+    return false;
+  }
+
+  EclipseWriter gen(build_settings, builder, file_out);
+  gen.Run();
+  return true;
+}
+
+void EclipseWriter::Run() {
+  GetAllIncludeDirs();
+  GetAllDefines();
+  WriteCDTSettings();
+}
+
+void EclipseWriter::GetAllIncludeDirs() {
+  std::vector<const Target*> targets = builder_->GetAllResolvedTargets();
+  for (const Target* target : targets) {
+    if (!UsesDefaultToolchain(target))
+      continue;
+
+    for (ConfigValuesIterator it(target); !it.done(); it.Next()) {
+      for (const SourceDir& include_dir : it.cur().include_dirs()) {
+        include_dirs_.insert(
+            FilePathToUTF8(build_settings_->GetFullPath(include_dir)));
+      }
+    }
+  }
+}
+
+void EclipseWriter::GetAllDefines() {
+  std::vector<const Target*> targets = builder_->GetAllResolvedTargets();
+  for (const Target* target : targets) {
+    if (!UsesDefaultToolchain(target))
+      continue;
+
+    for (ConfigValuesIterator it(target); !it.done(); it.Next()) {
+      for (const std::string& define : it.cur().defines()) {
+        size_t equal_pos = define.find('=');
+        std::string define_key;
+        std::string define_value;
+        if (equal_pos == std::string::npos) {
+          define_key = define;
+        } else {
+          define_key = define.substr(0, equal_pos);
+          define_value = define.substr(equal_pos + 1);
+        }
+        defines_[define_key] = define_value;
+      }
+    }
+  }
+}
+
+bool EclipseWriter::UsesDefaultToolchain(const Target* target) const {
+  return target->toolchain()->label() ==
+         builder_->loader()->GetDefaultToolchain();
+}
+
+void EclipseWriter::WriteCDTSettings() {
+  out_ << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" << std::endl;
+  XmlElementWriter cdt_properties_element(out_, "cdtprojectproperties",
+                                          XmlAttributes());
+
+  {
+    const char* kIncludesSectionName =
+        "org.eclipse.cdt.internal.ui.wizards.settingswizards.IncludePaths";
+    scoped_ptr<XmlElementWriter> section_element =
+        cdt_properties_element.SubElement(
+            "section", XmlAttributes("name", kIncludesSectionName));
+
+    section_element->SubElement(
+        "language", XmlAttributes("name", "holder for library settings"));
+
+    for (const std::string& language : languages_) {
+      scoped_ptr<XmlElementWriter> language_element =
+          section_element->SubElement("language",
+                                      XmlAttributes("name", language));
+      for (const std::string& include_dir : include_dirs_) {
+        language_element
+            ->SubElement("includepath",
+                         XmlAttributes("workspace_path", "false"))
+            ->Text(EscapeForXML(include_dir));
+      }
+    }
+  }
+
+  {
+    const char* kMacrosSectionName =
+        "org.eclipse.cdt.internal.ui.wizards.settingswizards.Macros";
+    scoped_ptr<XmlElementWriter> section_element =
+        cdt_properties_element.SubElement(
+            "section", XmlAttributes("name", kMacrosSectionName));
+
+    section_element->SubElement(
+        "language", XmlAttributes("name", "holder for library settings"));
+
+    for (const std::string& language : languages_) {
+      scoped_ptr<XmlElementWriter> language_element =
+          section_element->SubElement("language",
+                                      XmlAttributes("name", language));
+      for (const auto& key_val : defines_) {
+        scoped_ptr<XmlElementWriter> macro_element =
+            language_element->SubElement("macro");
+        macro_element->SubElement("name")->Text(EscapeForXML(key_val.first));
+        macro_element->SubElement("value")->Text(EscapeForXML(key_val.second));
+      }
+    }
+  }
+}