fileapi: add cache v2

Start with v2 to distinguish it from server-mode v1.

Issue: #18398

1 files changed, 105 insertions, 0 deletions

diff --git a/Source/cmFileAPICache.cxx b/Source/cmFileAPICache.cxx
new file mode 100644
index 0000000..074994a
--- /dev/null
+++ b/Source/cmFileAPICache.cxx
@@ -0,0 +1,105 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmFileAPICache.h"
+
+#include "cmFileAPI.h"
+#include "cmState.h"
+#include "cmake.h"
+
+#include "cm_jsoncpp_value.h"
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+namespace {
+
+class Cache
+{
+  cmFileAPI& FileAPI;
+  unsigned long Version;
+  cmState* State;
+
+  Json::Value DumpEntries();
+  Json::Value DumpEntry(std::string const& name);
+  Json::Value DumpEntryProperties(std::string const& name);
+  Json::Value DumpEntryProperty(std::string const& name,
+                                std::string const& prop);
+
+public:
+  Cache(cmFileAPI& fileAPI, unsigned long version);
+  Json::Value Dump();
+};
+
+Cache::Cache(cmFileAPI& fileAPI, unsigned long version)
+  : FileAPI(fileAPI)
+  , Version(version)
+  , State(this->FileAPI.GetCMakeInstance()->GetState())
+{
+  static_cast<void>(this->Version);
+}
+
+Json::Value Cache::Dump()
+{
+  Json::Value cache = Json::objectValue;
+  cache["entries"] = DumpEntries();
+  return cache;
+}
+
+Json::Value Cache::DumpEntries()
+{
+  Json::Value entries = Json::arrayValue;
+
+  std::vector<std::string> names = this->State->GetCacheEntryKeys();
+  std::sort(names.begin(), names.end());
+
+  for (std::string const& name : names) {
+    entries.append(this->DumpEntry(name));
+  }
+
+  return entries;
+}
+
+Json::Value Cache::DumpEntry(std::string const& name)
+{
+  Json::Value entry = Json::objectValue;
+  entry["name"] = name;
+  entry["type"] =
+    cmState::CacheEntryTypeToString(this->State->GetCacheEntryType(name));
+  entry["value"] = this->State->GetCacheEntryValue(name);
+
+  Json::Value properties = this->DumpEntryProperties(name);
+  if (!properties.empty()) {
+    entry["properties"] = std::move(properties);
+  }
+
+  return entry;
+}
+
+Json::Value Cache::DumpEntryProperties(std::string const& name)
+{
+  Json::Value properties = Json::arrayValue;
+  std::vector<std::string> props =
+    this->State->GetCacheEntryPropertyList(name);
+  std::sort(props.begin(), props.end());
+  for (std::string const& prop : props) {
+    properties.append(this->DumpEntryProperty(name, prop));
+  }
+  return properties;
+}
+
+Json::Value Cache::DumpEntryProperty(std::string const& name,
+                                     std::string const& prop)
+{
+  Json::Value property = Json::objectValue;
+  property["name"] = prop;
+  property["value"] = this->State->GetCacheEntryProperty(name, prop);
+  return property;
+}
+}
+
+Json::Value cmFileAPICacheDump(cmFileAPI& fileAPI, unsigned long version)
+{
+  Cache cache(fileAPI, version);
+  return cache.Dump();
+}