1 files changed, 196 insertions, 0 deletions
diff --git a/lsp.h b/lsp.h
new file mode 100644
index 0000000..20fdf2d
--- /dev/null
+++ b/lsp.h
@@ -0,0 +1,196 @@
+// @TODO:
+// - use document IDs instead of strings (also lets us use real document version numbers)
+// - document this and lsp.c.
+// - maximum queue size for requests/responses just in case?
+// - delete old sent requests
+//    (if the server never sends a response)
+// - TESTING: make rust-analyzer-slow (waits 10s before sending response)
+
+typedef enum {
+	LSP_REQUEST,
+	LSP_RESPONSE
+} LSPMessageType;
+
+typedef struct {
+	u32 offset;
+} LSPString;
+
+typedef struct {
+	u32 line;
+	// NOTE: this is the UTF-16 character index!
+	u32 character;
+} LSPPosition;
+
+typedef struct {
+	LSPPosition start;
+	LSPPosition end;
+} LSPRange;
+
+typedef enum {
+	LSP_REQUEST_NONE,
+	
+	// client-to-server
+	LSP_REQUEST_INITIALIZE,
+	LSP_REQUEST_INITIALIZED,
+	LSP_REQUEST_DID_OPEN,
+	LSP_REQUEST_DID_CHANGE,
+	LSP_REQUEST_COMPLETION,
+	LSP_REQUEST_SHUTDOWN,
+	LSP_REQUEST_EXIT,
+	
+	// server-to-client
+	LSP_REQUEST_SHOW_MESSAGE,
+	LSP_REQUEST_LOG_MESSAGE
+} LSPRequestType;
+
+typedef struct {
+	// buffer language
+	Language language;
+	// freed by lsp_request_free
+	char *document;
+	// freed by lsp_request_free
+	char *file_contents;
+} LSPRequestDidOpen;
+
+// see TextDocumentContentChangeEvent in the LSP spec
+typedef struct {
+	LSPRange range;
+	char *text;
+} LSPDocumentChangeEvent;
+
+typedef struct {
+	char *document;
+	LSPDocumentChangeEvent *changes; // dynamic array
+} LSPRequestDidChange;
+
+typedef enum {
+	ERROR = 1,
+	WARNING = 2,
+	INFO = 3,
+	LOG = 4
+} LSPWindowMessageType;
+
+typedef struct {
+	LSPWindowMessageType type;
+	// freed by lsp_request_free
+	char *message;
+} LSPRequestMessage;
+
+typedef struct {
+	// freed by lsp_request_free
+	char *path;
+	LSPPosition pos;
+} LSPDocumentPosition;
+
+typedef struct {
+	LSPDocumentPosition position;
+} LSPRequestCompletion;
+
+typedef struct {
+	// id is set by lsp.c; you shouldn't set it.
+	u32 id;
+	LSPRequestType type;
+	union {
+		LSPRequestDidOpen open;
+		LSPRequestDidChange change;
+		LSPRequestCompletion completion;
+		// for LSP_SHOW_MESSAGE and LSP_LOG_MESSAGE
+		LSPRequestMessage message;
+	} data;
+} LSPRequest;
+
+
+
+// see InsertTextFormat in the LSP spec.
+typedef enum {
+	// plain text
+	LSP_TEXT_EDIT_PLAIN = 1,
+	// snippet   e.g. "some_method($1, $2)$0"
+	LSP_TEXT_EDIT_SNIPPET = 2
+} LSPTextEditType;
+
+typedef struct {
+	LSPTextEditType type;
+
+	// if set to true, `range` should be ignored
+	//  -- this is a completion which uses insertText.
+	// how to handle this:
+	// "VS Code when code complete is requested in this example
+	// `con<cursor position>` and a completion item with an `insertText` of
+	// `console` is provided it will only insert `sole`"
+	bool at_cursor;
+	
+	LSPRange range;
+	LSPString new_text;
+} LSPTextEdit;
+
+typedef struct {
+	LSPString label;
+	LSPTextEdit text_edit;
+	// note: the items are sorted here in this file,
+	// so you probably don't need to access this.
+	LSPString sort_text;
+} LSPCompletionItem;
+
+typedef struct {
+	// dynamic array
+	LSPCompletionItem *items;
+} LSPResponseCompletion;
+
+typedef LSPRequestType LSPResponseType;
+typedef struct {
+	LSPResponseType type;
+	// LSP responses tend to have a lot of strings.
+	// to avoid doing a ton of allocations+frees,
+	// they're all stored here.
+	char *string_data;
+	union {
+		LSPResponseCompletion completion;
+	} data;
+} LSPResponse;
+
+typedef struct {
+	LSPMessageType type;
+	union {
+		LSPRequest request;
+		LSPResponse response;
+	} u;
+} LSPMessage;
+
+typedef struct LSP {
+	Process process;
+	u32 request_id;
+	LSPMessage *messages;
+	SDL_mutex *messages_mutex;
+	LSPRequest *requests_client2server;
+	LSPRequest *requests_server2client;
+	// we keep track of client-to-server requests
+	// so that we can process responses.
+	// also fucking rust-analyzer gives "waiting for cargo metadata or cargo check"
+	// WHY NOT JUST WAIT UNTIL YOUVE DONE THAT BEFORE SENDING THE INITIALIZE RESPONSE. YOU HAVE NOT FINISHED INITIALIZATION. YOU ARE LYING.
+	// YOU GIVE A -32801 ERROR CODE WHICH IS "ContentModified"  -- WHAT THE FUCK? THATS JUST COMPLETLY WRONG
+	// so we need to re-send requests in that case.
+	LSPRequest *requests_sent;
+	SDL_mutex *requests_mutex;
+	bool initialized; // has the response to the initialize request been sent?
+	SDL_Thread *communication_thread;
+	SDL_sem *quit_sem;
+	char *received_data; // dynamic array
+	SDL_mutex *error_mutex;
+	char error[256];
+} LSP;
+
+// @TODO: function declarations
+
+// returns true if there's an error.
+// returns false and sets error to "" if there's no error.
+// if clear = true, the error will be cleared.
+// you can set error = NULL, error_size = 0, clear = true to just clear the error
+bool lsp_get_error(LSP *lsp, char *error, size_t error_size, bool clear);
+void lsp_message_free(LSPMessage *message);
+void lsp_send_request(LSP *lsp, const LSPRequest *request);
+const char *lsp_response_string(const LSPResponse *response, LSPString string);
+bool lsp_create(LSP *lsp, const char *analyzer_command);
+bool lsp_next_message(LSP *lsp, LSPMessage *message);
+void lsp_document_changed(LSP *lsp, const char *document, LSPDocumentChangeEvent change);
+void lsp_free(LSP *lsp);