1 files changed, 211 insertions, 0 deletions
diff --git a/Source/cmFileAPI.h b/Source/cmFileAPI.h
new file mode 100644
index 0000000..22302b4
--- /dev/null
+++ b/Source/cmFileAPI.h
@@ -0,0 +1,211 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <map>
+#include <memory>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+#include <cm3p/json/reader.h>
+#include <cm3p/json/value.h>
+#include <cm3p/json/writer.h>
+
+class cmake;
+
+class cmFileAPI
+{
+public:
+  cmFileAPI(cmake* cm);
+
+  /** Read fileapi queries from disk.  */
+  void ReadQueries();
+
+  /** Write fileapi replies to disk.  */
+  void WriteReplies();
+
+  /** Get the "cmake" instance with which this was constructed.  */
+  cmake* GetCMakeInstance() const { return this->CMakeInstance; }
+
+  /** Convert a JSON object or array into an object with a single
+      "jsonFile" member specifying a file named with the given prefix
+      and holding the original object.  Other JSON types are unchanged.  */
+  Json::Value MaybeJsonFile(Json::Value in, std::string const& prefix);
+
+  /** Report file-api capabilities for cmake -E capabilities.  */
+  static Json::Value ReportCapabilities();
+
+private:
+  cmake* CMakeInstance;
+
+  /** The api/v1 directory location.  */
+  std::string APIv1;
+
+  /** The set of files we have just written to the reply directory.  */
+  std::unordered_set<std::string> ReplyFiles;
+
+  static std::vector<std::string> LoadDir(std::string const& dir);
+  void RemoveOldReplyFiles();
+
+  // Keep in sync with ObjectKindName.
+  enum class ObjectKind
+  {
+    CodeModel,
+    Cache,
+    CMakeFiles,
+    Toolchains,
+    InternalTest
+  };
+
+  /** Identify one object kind and major version.  */
+  struct Object
+  {
+    ObjectKind Kind;
+    unsigned long Version = 0;
+    friend bool operator<(Object const& l, Object const& r)
+    {
+      if (l.Kind != r.Kind) {
+        return l.Kind < r.Kind;
+      }
+      return l.Version < r.Version;
+    }
+  };
+
+  /** Represent content of a query directory.  */
+  struct Query
+  {
+    /** Known object kind-version pairs.  */
+    std::vector<Object> Known;
+    /** Unknown object kind names.  */
+    std::vector<std::string> Unknown;
+  };
+
+  /** Represent one request in a client 'query.json'.  */
+  struct ClientRequest : public Object
+  {
+    /** Empty if request is valid, else the error string.  */
+    std::string Error;
+  };
+
+  /** Represent the "requests" in a client 'query.json'.  */
+  struct ClientRequests : public std::vector<ClientRequest>
+  {
+    /** Empty if requests field is valid, else the error string.  */
+    std::string Error;
+  };
+
+  /** Represent the content of a client query.json file.  */
+  struct ClientQueryJson
+  {
+    /** The error string if parsing failed, else empty.  */
+    std::string Error;
+
+    /** The 'query.json' object "client" member if it exists, else null.  */
+    Json::Value ClientValue;
+
+    /** The 'query.json' object "requests" member if it exists, else null.  */
+    Json::Value RequestsValue;
+
+    /** Requests extracted from 'query.json'.  */
+    ClientRequests Requests;
+  };
+
+  /** Represent content of a client query directory.  */
+  struct ClientQuery
+  {
+    /** The content of the client query directory except 'query.json'.  */
+    Query DirQuery;
+
+    /** True if 'query.json' exists.  */
+    bool HaveQueryJson = false;
+
+    /** The 'query.json' content.  */
+    ClientQueryJson QueryJson;
+  };
+
+  /** Whether the top-level query directory exists at all.  */
+  bool QueryExists = false;
+
+  /** The content of the top-level query directory.  */
+  Query TopQuery;
+
+  /** The content of each "client-$client" query directory.  */
+  std::map<std::string, ClientQuery> ClientQueries;
+
+  /** Reply index object generated for object kind/version.
+      This populates the "objects" field of the reply index.  */
+  std::map<Object, Json::Value> ReplyIndexObjects;
+
+  std::unique_ptr<Json::CharReader> JsonReader;
+  std::unique_ptr<Json::StreamWriter> JsonWriter;
+
+  bool ReadJsonFile(std::string const& file, Json::Value& value,
+                    std::string& error);
+
+  std::string WriteJsonFile(
+    Json::Value const& value, std::string const& prefix,
+    std::string (*computeSuffix)(std::string const&) = ComputeSuffixHash);
+  static std::string ComputeSuffixHash(std::string const&);
+  static std::string ComputeSuffixTime(std::string const&);
+
+  static bool ReadQuery(std::string const& query,
+                        std::vector<Object>& objects);
+  void ReadClient(std::string const& client);
+  void ReadClientQuery(std::string const& client, ClientQueryJson& q);
+
+  Json::Value BuildReplyIndex();
+  Json::Value BuildCMake();
+  Json::Value BuildReply(Query const& q);
+  static Json::Value BuildReplyError(std::string const& error);
+  Json::Value const& AddReplyIndexObject(Object const& o);
+
+  static const char* ObjectKindName(ObjectKind kind);
+  static std::string ObjectName(Object const& o);
+
+  static Json::Value BuildVersion(unsigned int major, unsigned int minor);
+
+  Json::Value BuildObject(Object const& object);
+
+  ClientRequests BuildClientRequests(Json::Value const& requests);
+  ClientRequest BuildClientRequest(Json::Value const& request);
+  Json::Value BuildClientReply(ClientQuery const& q);
+  Json::Value BuildClientReplyResponses(ClientRequests const& requests);
+  Json::Value BuildClientReplyResponse(ClientRequest const& request);
+
+  struct RequestVersion
+  {
+    unsigned int Major = 0;
+    unsigned int Minor = 0;
+  };
+  static bool ReadRequestVersions(Json::Value const& version,
+                                  std::vector<RequestVersion>& versions,
+                                  std::string& error);
+  static bool ReadRequestVersion(Json::Value const& version, bool inArray,
+                                 std::vector<RequestVersion>& result,
+                                 std::string& error);
+  static std::string NoSupportedVersion(
+    std::vector<RequestVersion> const& versions);
+
+  void BuildClientRequestCodeModel(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildCodeModel(Object const& object);
+
+  void BuildClientRequestCache(ClientRequest& r,
+                               std::vector<RequestVersion> const& versions);
+  Json::Value BuildCache(Object const& object);
+
+  void BuildClientRequestCMakeFiles(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildCMakeFiles(Object const& object);
+
+  void BuildClientRequestToolchains(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildToolchains(Object const& object);
+
+  void BuildClientRequestInternalTest(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildInternalTest(Object const& object);
+};