cmFileAPI: Add "toolchains" object kind.

Fixes #19514

1 files changed, 151 insertions, 0 deletions

diff --git a/Source/cmFileAPIToolchains.cxx b/Source/cmFileAPIToolchains.cxx
new file mode 100644
index 0000000..722c114
--- /dev/null
+++ b/Source/cmFileAPIToolchains.cxx
@@ -0,0 +1,151 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPIToolchains.h"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <cm3p/json/value.h>
+
+#include "cmFileAPI.h"
+#include "cmGlobalGenerator.h"
+#include "cmMakefile.h"
+#include "cmProperty.h"
+#include "cmState.h"
+#include "cmStringAlgorithms.h"
+#include "cmake.h"
+
+namespace {
+
+struct ToolchainVariable
+{
+  std::string ObjectKey;
+  std::string VariableSuffix;
+  bool IsList;
+};
+
+class Toolchains
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+
+  static const std::vector<ToolchainVariable> CompilerVariables;
+  static const std::vector<ToolchainVariable> CompilerImplicitVariables;
+  static const ToolchainVariable SourceFileExtensionsVariable;
+
+  Json::Value DumpToolchains();
+  Json::Value DumpToolchain(std::string const& lang);
+  Json::Value DumpToolchainVariables(
+    cmMakefile const* mf, std::string const& lang,
+    std::vector<ToolchainVariable> const& variables);
+  void DumpToolchainVariable(cmMakefile const* mf, Json::Value& object,
+                             std::string const& lang,
+                             ToolchainVariable const& variable);
+
+public:
+  Toolchains(cmFileAPI& fileAPI, unsigned long version);
+  Json::Value Dump();
+};
+
+const std::vector<ToolchainVariable> Toolchains::CompilerVariables{
+  { "path", "COMPILER", false },
+  { "id", "COMPILER_ID", false },
+  { "version", "COMPILER_VERSION", false },
+  { "target", "COMPILER_TARGET", false },
+};
+
+const std::vector<ToolchainVariable> Toolchains::CompilerImplicitVariables{
+  { "includeDirectories", "IMPLICIT_INCLUDE_DIRECTORIES", true },
+  { "linkDirectories", "IMPLICIT_LINK_DIRECTORIES", true },
+  { "linkFrameworkDirectories", "IMPLICIT_LINK_FRAMEWORK_DIRECTORIES", true },
+  { "linkLibraries", "IMPLICIT_LINK_LIBRARIES", true },
+};
+
+const ToolchainVariable Toolchains::SourceFileExtensionsVariable{
+  "sourceFileExtensions", "SOURCE_FILE_EXTENSIONS", true
+};
+
+Toolchains::Toolchains(cmFileAPI& fileAPI, unsigned long version)
+  : FileAPI(fileAPI)
+  , Version(version)
+{
+  static_cast<void>(this->Version);
+}
+
+Json::Value Toolchains::Dump()
+{
+  Json::Value toolchains = Json::objectValue;
+  toolchains["toolchains"] = this->DumpToolchains();
+  return toolchains;
+}
+
+Json::Value Toolchains::DumpToolchains()
+{
+  Json::Value toolchains = Json::arrayValue;
+
+  for (std::string const& lang :
+       this->FileAPI.GetCMakeInstance()->GetState()->GetEnabledLanguages()) {
+    toolchains.append(this->DumpToolchain(lang));
+  }
+
+  return toolchains;
+}
+
+Json::Value Toolchains::DumpToolchain(std::string const& lang)
+{
+  const auto& mf =
+    this->FileAPI.GetCMakeInstance()->GetGlobalGenerator()->GetMakefiles()[0];
+  Json::Value toolchain = Json::objectValue;
+  toolchain["language"] = lang;
+  toolchain["compiler"] =
+    this->DumpToolchainVariables(mf.get(), lang, CompilerVariables);
+  toolchain["compiler"]["implicit"] =
+    this->DumpToolchainVariables(mf.get(), lang, CompilerImplicitVariables);
+  this->DumpToolchainVariable(mf.get(), toolchain, lang,
+                              SourceFileExtensionsVariable);
+  return toolchain;
+}
+
+Json::Value Toolchains::DumpToolchainVariables(
+  cmMakefile const* mf, std::string const& lang,
+  std::vector<ToolchainVariable> const& variables)
+{
+  Json::Value object = Json::objectValue;
+  for (const auto& variable : variables) {
+    this->DumpToolchainVariable(mf, object, lang, variable);
+  }
+  return object;
+}
+
+void Toolchains::DumpToolchainVariable(cmMakefile const* mf,
+                                       Json::Value& object,
+                                       std::string const& lang,
+                                       ToolchainVariable const& variable)
+{
+  std::string const variableName =
+    cmStrCat("CMAKE_", lang, "_", variable.VariableSuffix);
+
+  if (variable.IsList) {
+    std::vector<std::string> values;
+    if (mf->GetDefExpandList(variableName, values)) {
+      Json::Value jsonArray = Json::arrayValue;
+      for (std::string const& value : values) {
+        jsonArray.append(value);
+      }
+      object[variable.ObjectKey] = jsonArray;
+    }
+  } else {
+    cmProp def = mf->GetDefinition(variableName);
+    if (def) {
+      object[variable.ObjectKey] = *def;
+    }
+  }
+}
+}
+
+Json::Value cmFileAPIToolchainsDump(cmFileAPI& fileAPI, unsigned long version)
+{
+  Toolchains toolchains(fileAPI, version);
+  return toolchains.Dump();
+}