PersistentJSONValue (#2028)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Use 'Process' to communicate with an command line tool.

* Remove slang-win-stream

* Tidy up windows ProcessUtil.

* First version of BufferedReadStream.

* Windows working IPC for steams.

* Test proxy count option.

* Split Process/ProcessUtil. Process is platform dependant. ProcessUtil are functions that are platform independent.

* First implementation of Unix Process interface.

* Unix process compiles on cygwin.

* Fix typo in unix process.

* Separate unix pipe stream error of invalid access, from pipe availability.

* Fix in standard line extraction.

* Make fd non blocking.

* Fix issues with Windows Process streams.

* Added UnixPipe.

* Some fixes around UnixPipeStream.

* Make a unix stream closed explicit.

* Hack to debug linux process/stream.

* Revert to old linux pipe handling.

* Pass executable path for unit tests.
Split out CommandLine into own source.

* Small improvements in process/command line.

* Check process behavior with crash.

* Make stderr and stdout unbuffered for crash testing.

* Only turn disable buffering in crash test.

* Disable crash test on CI.

* Fix crash on clang/linux.

* Enable crash test.
Remove _appendBuffer as can use StreamUtil functionality.

* Added inital processing for http headers.

* Small improvements to HttpHeader.

* First pass HTTPPacketConnection working on windows.

* Enable other Process communication tests.

* Update comments.

* WIP JSON RPC.

* Add terminate to Process.
Made JSONRPC a Util.

* Small tidy up around HTTPPacketConnection.

* Improve process termination options.

* WIP for test-server.

* Add diagnostics error handling to test-server.

* Improved JSON support.
Parsing/creating JSON-RPC messages.

* WIP JSONRPC parsing.

* First pass RttiInfo support.

* WIP converting between JSON/native types.

* Project files.

* Split out RttiUtil.
Made RttiInfo constuction thread safe.

* WIP RTTI<->JSON.

* Add diagnostics to JSON<->native conversions.

* Make RttiInfo for structs globals. Avoids problem around derived types (like pointers), being able to cause an abort.

* Add pointer support to RTTI.
Fixed some compilation issues on linux.

* Add fixed array support.

* Added Rtti unit test.

* Add rtti unit test.

* Split out quoted/unquoted key handling.
Fix bugs in JSON value/container.
Added JSON native test.

* Make default array allocator use malloc/free.
Remove the new[] handler (doesn't work on visuals studio).

* Fix for linux warning.

* Remove some test code.

* Fix issues on x86 win.

* Fix warning on aarch64.

* Fix some bugs in JSON parsing/handling.
Make Rtti work copy/dtor/ctor struct types.

* Testing JSON<->native with fixed array.
Make makeArrayView explicit if it's just a single value.
Added array type.

* Fix getting arrayView.

* Improve JSON diagnostic name.

* First pass refactor using Rtti for JSON RPC.

* First pass of test server using RTTI/JSON-RPC.

* Added JSONRPCConnection.

* Fix some naming issues.

* First pass of test-server working.

* Added unit test support for JSON-RPC test server.

* Fix compilation issues on linux around template handling.

* Typo fix.

* Fix a bug around SourceLoc lookup with JSONContainer.

* Set the console type to console for ISlangWriters.

* Small improvements to test-server.

* Small improvements in test-server.

* Small fix.

* Remove test-proxy. Make test-process a process that can be used to unit test 'Process'.
Adding mechanism to control spawning that will create a new process for every test.

* Ability to remove source manager for JSONValue.

* WIP SimpleJSONValue.

* Add PersistentJSONValue

* Testing around PersistentJSONValue.
Bug fixes.

* Small code improvements.

1 files changed, 60 insertions, 0 deletions

diff --git a/source/core/slang-string.cpp b/source/core/slang-string.cpp
index e21333809..1a6221cc8 100644
--- a/source/core/slang-string.cpp
+++ b/source/core/slang-string.cpp
@@ -11,6 +11,66 @@ namespace Slang
     // for anything that uses core
     static const auto s_charUtilLink = CharUtil::_ensureLink();
 
+
+    // StringRepresentation
+
+    void StringRepresentation::setContents(const UnownedStringSlice& slice)
+    {
+        const auto sliceLength = slice.getLength();
+        SLANG_ASSERT(sliceLength <= capacity);
+
+        char* chars = getData();
+
+        // Use move (rather than memcpy), because the slice *could* be contained in the StringRepresentation
+        ::memmove(chars, slice.begin(), sliceLength * sizeof(char));
+        // Zero terminate. 
+        chars[sliceLength] = 0;
+        // Set the length
+        length = sliceLength;
+    }
+
+
+    /* static */StringRepresentation* StringRepresentation::create(const UnownedStringSlice& slice)
+    {
+        const auto sliceLength = slice.getLength();
+
+        if (sliceLength)
+        {
+            StringRepresentation* rep = StringRepresentation::createWithLength(sliceLength);
+         
+            char* chars = rep->getData();
+            ::memcpy(chars, slice.begin(), sizeof(char) * sliceLength);
+            chars[sliceLength] = 0;
+
+            return rep;
+        }
+        else
+        {
+            return nullptr;
+        }
+    }
+
+    /* static */StringRepresentation* StringRepresentation::createWithReference(const UnownedStringSlice& slice)
+    {
+        const auto sliceLength = slice.getLength();
+
+        if (sliceLength)
+        {
+            StringRepresentation* rep = StringRepresentation::createWithLength(sliceLength);
+            rep->addReference();
+
+            char* chars = rep->getData();
+            ::memcpy(chars, slice.begin(), sizeof(char) * sliceLength);
+            chars[sliceLength] = 0;
+
+            return rep;
+        }
+        else
+        {
+            return nullptr;
+        }
+    }
+
     // OSString
 
     OSString::OSString()