| // Copyright 2010 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package wc |
| |
| import ( |
| "bytes" |
| "fmt" |
| "http" |
| "io" |
| "log" |
| "sort" |
| "template" |
| "runtime/debug" |
| ) |
| |
| func frontPageHandler(c http.ResponseWriter, req *http.Request) { |
| frontPage.Execute(c, "a man a plan a canal panama") |
| } |
| |
| var wcFunc func(string)map[string]int |
| |
| func runwc(s string) (m map[string]int, err string) { |
| defer func() { |
| if v := recover(); v != nil { |
| err = fmt.Sprintln("panic: ", v) |
| err += "\nCall stack:\n" + string(debug.Stack()) |
| } |
| }() |
| return wcFunc(s), "" |
| } |
| |
| type wordCount struct { |
| Word string |
| Count int |
| } |
| |
| type wordCounts []wordCount |
| |
| func (wc wordCounts) Less(i, j int) bool { |
| return wc[i].Count > wc[j].Count || |
| wc[i].Count == wc[j].Count && wc[i].Word < wc[j].Word |
| } |
| |
| func (wc wordCounts) Swap(i, j int) { |
| wc[i], wc[j] = wc[j], wc[i] |
| } |
| |
| func (wc wordCounts) Len() int { |
| return len(wc) |
| } |
| |
| func wcHandler(c http.ResponseWriter, req *http.Request) { |
| var buf bytes.Buffer |
| io.Copy(&buf, req.Body) |
| m, err := runwc(buf.String()) |
| if err != "" { |
| c.WriteHeader(404) |
| c.Write([]byte("<pre>")) |
| template.HTMLEscape(c, []byte(err)) |
| c.Write([]byte("</pre>")) |
| return |
| } |
| w := make([]wordCount, len(m)) |
| n := 0 |
| for word, count := range m { |
| w[n] = wordCount{word, count} |
| n++ |
| } |
| sort.Sort(wordCounts(w)) |
| table.Execute(c, w) |
| } |
| |
| // Serve runs a web server on port 4000 counting words using f. |
| func Serve(f func(string)map[string]int) { |
| wcFunc = f |
| http.HandleFunc("/", frontPageHandler) |
| http.HandleFunc("/wc", wcHandler) |
| err := http.ListenAndServe("127.0.0.1:4000", nil) |
| log.Fatal(err) |
| } |
| |
| var frontPage, table *template.Template |
| |
| func init() { |
| frontPage = template.New(nil) |
| frontPage.SetDelims("«", "»") |
| err := frontPage.Parse(frontPageText) |
| if err != nil { |
| panic(err) |
| } |
| |
| table = template.New(nil) |
| table.SetDelims("«", "»") |
| err = table.Parse(tableText) |
| if err != nil { |
| panic(err) |
| } |
| } |
| |
| var frontPageText = `<!doctype html> |
| <html> |
| <head> |
| <style> |
| h1 { font-family: monospace; } |
| </style> |
| <script> |
| var xmlreq; |
| |
| function runwc() { |
| var prog = document.getElementById("edit").value; |
| var req = new XMLHttpRequest(); |
| xmlreq = req; |
| req.onreadystatechange = wcUpdate; |
| req.open("POST", "/wc", true); |
| req.setRequestHeader("Content-Type", "text/plain; charset=utf-8"); |
| req.send(prog); |
| } |
| |
| function wcUpdate() { |
| var req = xmlreq; |
| if(!req || req.readyState != 4) { |
| return; |
| } |
| if(req.status == 200) { |
| document.getElementById("output").innerHTML = req.responseText; |
| document.getElementById("errors").innerHTML = ""; |
| } else { |
| document.getElementById("errors").innerHTML = req.responseText; |
| document.getElementById("output").innerHTML = ""; |
| } |
| } |
| </script> |
| </head> |
| <body> |
| <h1>Interactive Word Count</h1> |
| <table width="100%"><tr><td width="60%" valign="top"> |
| <textarea autofocus="true" id="edit" style="width: 100%; height: 200px; font-size: 100%;" spellcheck="false" contenteditable="true" onkeyup="runwc();">«@|html» |
| </textarea> |
| <br/> |
| <td width="3%"> |
| <td width="27%" align="right" valign="top"> |
| <div id="output" align="left" style="width: 100%; font-size: 100%;"> |
| </div> |
| </table> |
| <div id="errors" align="left" style="width: 100%; font-family: monaco; font-size: 100%; color: #800;"> |
| </div> |
| </body> |
| </html> |
| ` |
| |
| var tableText = `map [ |
| <table> |
| «.repeated section @» |
| <tr><td width=20><td>«Word»<td>«Count»</tr> |
| «.end» |
| </table> |
| ] |
| ` |
| |
