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-rw-r--r--lsp-write-request.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/lsp-write-request.c b/lsp-write-request.c
new file mode 100644
index 0000000..b7ce148
--- /dev/null
+++ b/lsp-write-request.c
@@ -0,0 +1,303 @@
+
+static const char *lsp_language_id(Language lang) {
+ switch (lang) {
+ case LANG_CONFIG:
+ case LANG_TED_CFG:
+ case LANG_NONE:
+ return "text";
+ case LANG_C:
+ return "c";
+ case LANG_CPP:
+ return "cpp";
+ case LANG_JAVA:
+ return "java";
+ case LANG_JAVASCRIPT:
+ return "javascript";
+ case LANG_MARKDOWN:
+ return "markdown";
+ case LANG_GO:
+ return "go";
+ case LANG_RUST:
+ return "rust";
+ case LANG_PYTHON:
+ return "python";
+ case LANG_HTML:
+ return "html";
+ case LANG_TEX:
+ return "latex";
+ case LANG_COUNT: break;
+ }
+ assert(0);
+ return "text";
+}
+
+
+typedef struct {
+ StrBuilder builder;
+ bool is_first;
+} JSONWriter;
+
+static JSONWriter json_writer_new(void) {
+ return (JSONWriter){
+ .builder = str_builder_new(),
+ .is_first = true
+ };
+}
+
+static void write_obj_start(JSONWriter *o) {
+ str_builder_append(&o->builder, "{");
+ o->is_first = true;
+}
+
+static void write_obj_end(JSONWriter *o) {
+ str_builder_append(&o->builder, "}");
+ o->is_first = false;
+}
+
+static void write_arr_start(JSONWriter *o) {
+ str_builder_append(&o->builder, "[");
+ o->is_first = true;
+}
+
+static void write_arr_end(JSONWriter *o) {
+ str_builder_append(&o->builder, "]");
+ o->is_first = false;
+}
+
+static void write_arr_elem(JSONWriter *o) {
+ if (o->is_first) {
+ str_builder_append(&o->builder, ",");
+ o->is_first = false;
+ }
+}
+
+static void write_string(JSONWriter *o, const char* string) {
+ // @TODO: escape in-place
+ char *escaped = json_escape(string);
+ str_builder_appendf(&o->builder, "\"%s\"", escaped);
+ free(escaped);
+}
+
+static void write_key(JSONWriter *o, const char *key) {
+ // NOTE: no keys in the LSP spec need escaping.
+ str_builder_appendf(&o->builder, "%s\"%s\":", o->is_first ? "" : ",", key);
+ o->is_first = false;
+}
+
+static void write_key_obj_start(JSONWriter *o, const char *key) {
+ write_key(o, key);
+ write_obj_start(o);
+}
+
+static void write_key_arr_start(JSONWriter *o, const char *key) {
+ write_key(o, key);
+ write_arr_start(o);
+}
+
+static void write_number(JSONWriter *o, double number) {
+ str_builder_appendf(&o->builder, "%g", number);
+}
+
+static void write_key_number(JSONWriter *o, const char *key, double number) {
+ write_key(o, key);
+ write_number(o, number);
+}
+
+static void write_null(JSONWriter *o) {
+ str_builder_append(&o->builder, "null");
+}
+
+static void write_key_null(JSONWriter *o, const char *key) {
+ write_key(o, key);
+ write_null(o);
+}
+
+static void write_key_string(JSONWriter *o, const char *key, const char *s) {
+ write_key(o, key);
+ write_string(o, s);
+}
+
+static void write_file_uri(JSONWriter *o, const char *path) {
+ char *escaped_path = json_escape(path);
+ str_builder_appendf(&o->builder, "\"file:///%s\"", escaped_path);
+ free(escaped_path);
+}
+
+static void write_key_file_uri(JSONWriter *o, const char *key, const char *path) {
+ write_key(o, key);
+ write_file_uri(o, path);
+}
+
+static void write_position(JSONWriter *o, LSPPosition position) {
+ write_obj_start(o);
+ write_key_number(o, "line", (double)position.line);
+ write_key_number(o, "character", (double)position.character);
+ write_obj_end(o);
+}
+
+static void write_key_position(JSONWriter *o, const char *key, LSPPosition position) {
+ write_key(o, key);
+ write_position(o, position);
+}
+
+static void write_range(JSONWriter *o, LSPRange range) {
+ write_obj_start(o);
+ write_key_position(o, "start", range.start);
+ write_key_position(o, "end", range.end);
+ write_obj_end(o);
+}
+
+static void write_key_range(JSONWriter *o, const char *key, LSPRange range) {
+ write_key(o, key);
+ write_range(o, range);
+}
+
+static const char *lsp_request_method(LSPRequest *request) {
+ switch (request->type) {
+ case LSP_REQUEST_NONE: break;
+ case LSP_REQUEST_SHOW_MESSAGE:
+ return "window/showMessage";
+ case LSP_REQUEST_LOG_MESSAGE:
+ return "window/logMessage";
+ case LSP_REQUEST_INITIALIZE:
+ return "initialize";
+ case LSP_REQUEST_INITIALIZED:
+ return "initialized";
+ case LSP_REQUEST_DID_OPEN:
+ return "textDocument/didOpen";
+ case LSP_REQUEST_DID_CHANGE:
+ return "textDocument/didChange";
+ case LSP_REQUEST_COMPLETION:
+ return "textDocument/completion";
+ case LSP_REQUEST_SHUTDOWN:
+ return "shutdown";
+ case LSP_REQUEST_EXIT:
+ return "exit";
+ }
+ assert(0);
+ return "$/ignore";
+}
+
+// technically there are "requests" and "notifications"
+// notifications are different in that they don't have IDs and don't return responses.
+// this function handles both.
+// NOTE: do not call lsp_request_free on request. freeing the request will be handled.
+// returns the ID of the request
+static void write_request(LSP *lsp, LSPRequest *request) {
+ JSONWriter writer = json_writer_new();
+ JSONWriter *o = &writer;
+
+ u32 max_header_size = 64;
+ // this is where our header will go
+ str_builder_append_null(&o->builder, max_header_size);
+
+ write_obj_start(o);
+ write_key_string(o, "jsonrpc", "2.0");
+
+ bool is_notification = request->type == LSP_REQUEST_INITIALIZED
+ || request->type == LSP_REQUEST_EXIT
+ || request->type == LSP_REQUEST_DID_OPEN;
+ if (!is_notification) {
+ u32 id = lsp->request_id++;
+ request->id = id;
+ write_key_number(o, "id", id);
+ }
+ write_key_string(o, "method", lsp_request_method(request));
+
+ switch (request->type) {
+ case LSP_REQUEST_NONE:
+ // these are server-to-client-only requests
+ case LSP_REQUEST_SHOW_MESSAGE:
+ case LSP_REQUEST_LOG_MESSAGE:
+ assert(0);
+ break;
+ case LSP_REQUEST_INITIALIZED:
+ case LSP_REQUEST_SHUTDOWN:
+ case LSP_REQUEST_EXIT:
+ // no params
+ break;
+ case LSP_REQUEST_INITIALIZE: {
+ write_key_obj_start(o, "params");
+ write_key_number(o, "processId", process_get_id());
+ write_key_obj_start(o, "capabilities");
+ write_obj_end(o);
+ write_key_null(o, "rootUri");
+ write_key_null(o, "workspaceFolders");
+ write_obj_end(o);
+ } break;
+ case LSP_REQUEST_DID_OPEN: {
+ const LSPRequestDidOpen *open = &request->data.open;
+ write_key_obj_start(o, "params");
+ write_key_obj_start(o, "textDocument");
+ write_key_file_uri(o, "uri", open->document);
+ write_key_string(o, "languageId", lsp_language_id(open->language));
+ write_key_number(o, "version", 1);
+ write_key_string(o, "text", open->file_contents);
+ write_obj_end(o);
+ write_obj_end(o);
+ } break;
+ case LSP_REQUEST_DID_CHANGE: {
+ LSPRequestDidChange *change = &request->data.change;
+ static unsigned long long version_number = 1; // @TODO @TEMPORARY
+ ++version_number;
+ write_key_obj_start(o, "params");
+ write_key_obj_start(o, "textDocument");
+ write_key_number(o, "version", (double)version_number);
+ write_key_file_uri(o, "uri", change->document);
+ write_key_arr_start(o, "contentChanges");
+ arr_foreach_ptr(change->changes, LSPDocumentChangeEvent, event) {
+ write_arr_elem(o);
+ write_obj_start(o);
+ write_key_range(o, "range", event->range);
+ write_key_string(o, "text", event->text);
+ write_obj_end(o);
+ }
+ write_arr_end(o);
+ write_obj_end(o);
+ write_obj_end(o);
+ } break;
+ case LSP_REQUEST_COMPLETION: {
+ const LSPRequestCompletion *completion = &request->data.completion;
+ write_key_obj_start(o, "params");
+ write_key_obj_start(o, "textDocument");
+ write_key_file_uri(o, "uri", completion->position.path);
+ write_obj_end(o);
+ write_key_position(o, "position", completion->position.pos);
+ write_obj_end(o);
+ } break;
+ }
+
+ write_obj_end(o);
+
+ StrBuilder builder = o->builder;
+
+ // this is kind of hacky but it lets us send the whole request with one write call.
+ // probably not *actually* needed. i thought it would help fix an error but it didn't.
+ size_t content_length = str_builder_len(&builder) - max_header_size;
+ char content_length_str[32];
+ sprintf(content_length_str, "%zu", content_length);
+ size_t header_size = strlen("Content-Length: \r\n\r\n") + strlen(content_length_str);
+ char *header = &builder.str[max_header_size - header_size];
+ strcpy(header, "Content-Length: ");
+ strcat(header, content_length_str);
+ // we specifically DON'T want a null byte
+ memcpy(header + strlen(header), "\r\n\r\n", 4);
+
+ char *content = header;
+ #if 1
+ printf("\x1b[1m%s\x1b[0m\n",content);
+ #endif
+
+ // @TODO: does write always write the full amount? probably not. this should be fixed.
+ process_write(&lsp->process, content, strlen(content));
+
+ str_builder_free(&builder);
+
+ if (is_notification) {
+ lsp_request_free(request);
+ } else {
+ SDL_LockMutex(lsp->requests_mutex);
+ arr_add(lsp->requests_sent, *request);
+ SDL_UnlockMutex(lsp->requests_mutex);
+ }
+}