// Copyright (c) 2014-present, b3log.org // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package playground import ( "bytes" "encoding/json" "net/http" "os" "os/exec" "strconv" "strings" "github.com/88250/gulu" "github.com/88250/wide/session" ) // AutocompleteHandler handles request of code autocompletion. func AutocompleteHandler(w http.ResponseWriter, r *http.Request) { var args map[string]interface{} if err := json.NewDecoder(r.Body).Decode(&args); err != nil { logger.Error(err) http.Error(w, err.Error(), http.StatusInternalServerError) return } session, _ := session.HTTPSession.Get(r, session.CookieName) if session.IsNew { http.Error(w, "Forbidden", http.StatusForbidden) return } code := args["code"].(string) line := int(args["cursorLine"].(float64)) ch := int(args["cursorCh"].(float64)) file, err := os.Create("wide_autocomplete_" + gulu.Rand.String(16) + ".go") if nil != err { logger.Error(err) http.Error(w, err.Error(), http.StatusInternalServerError) return } file.WriteString(code) file.Close() path := file.Name() defer os.Remove(path) offset := getCursorOffset(code, line, ch) argv := []string{"-f=json", "--in=" + path, "autocomplete", strconv.Itoa(offset)} gocode := gulu.Go.GetExecutableInGOBIN("gocode") cmd := exec.Command(gocode, argv...) output, err := cmd.CombinedOutput() if nil != err { logger.Error(err) http.Error(w, err.Error(), http.StatusInternalServerError) return } w.Header().Set("Content-Type", "application/json") w.Write(output) } // getCursorOffset calculates the cursor offset. // // line is the line number, starts with 0 that means the first line // ch is the column number, starts with 0 that means the first column func getCursorOffset(code string, line, ch int) (offset int) { lines := strings.Split(code, "\n") // calculate sum length of lines before for i := 0; i < line; i++ { offset += len(lines[i]) } // calculate length of the current line and column curLine := lines[line] var buffer bytes.Buffer r := []rune(curLine) for i := 0; i < ch; i++ { buffer.WriteString(string(r[i])) } offset += len(buffer.String()) // append length of current line offset += line // append number of '\n' return offset }