98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
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// Copyright (c) 2014-2015, b3log.org
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package playground
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import (
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"bytes"
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"encoding/json"
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"net/http"
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"os/exec"
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"strconv"
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"strings"
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"github.com/b3log/wide/session"
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"github.com/b3log/wide/util"
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)
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// AutocompleteHandler handles request of code autocompletion.
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func AutocompleteHandler(w http.ResponseWriter, r *http.Request) {
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var args map[string]interface{}
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if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
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logger.Error(err)
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http.Error(w, err.Error(), 500)
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return
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}
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session, _ := session.HTTPSession.Get(r, "wide-session")
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if session.IsNew {
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http.Error(w, "Forbidden", http.StatusForbidden)
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return
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}
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code := args["code"].(string)
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line := int(args["cursorLine"].(float64))
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ch := int(args["cursorCh"].(float64))
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offset := getCursorOffset(code, line, ch)
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argv := []string{"-f=json", "autocomplete", strconv.Itoa(offset)}
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gocode := util.Go.GetExecutableInGOBIN("gocode")
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cmd := exec.Command(gocode, argv...)
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stdin, _ := cmd.StdinPipe()
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stdin.Write([]byte(code))
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stdin.Close()
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output, err := cmd.CombinedOutput()
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if nil != err {
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logger.Error(err)
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http.Error(w, err.Error(), 500)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(output)
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}
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// getCursorOffset calculates the cursor offset.
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//
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// line is the line number, starts with 0 that means the first line
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// ch is the column number, starts with 0 that means the first column
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func getCursorOffset(code string, line, ch int) (offset int) {
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lines := strings.Split(code, "\n")
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// calculate sum length of lines before
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for i := 0; i < line; i++ {
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offset += len(lines[i])
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}
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// calculate length of the current line and column
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curLine := lines[line]
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var buffer bytes.Buffer
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r := []rune(curLine)
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for i := 0; i < ch; i++ {
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buffer.WriteString(string(r[i]))
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}
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offset += len(buffer.String()) // append length of current line
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offset += line // append number of '\n'
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return offset
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}
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