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Merge pull request #23 from EricChiang/json
json{} displayer added- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
|
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| "code.google.com/p/go.net/html" | ||
| ) | ||
|
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| type Displayer interface { | ||
| Display(nodes []*html.Node) | ||
| } | ||
|
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| type TextDisplayer struct { | ||
| } | ||
|
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| func (t TextDisplayer) Display(nodes []*html.Node) { | ||
| for _, node := range nodes { | ||
| if node.Type == html.TextNode { | ||
| fmt.Println(node.Data) | ||
| } | ||
| children := []*html.Node{} | ||
| child := node.FirstChild | ||
| for child != nil { | ||
| children = append(children, child) | ||
| child = child.NextSibling | ||
| } | ||
| t.Display(children) | ||
| } | ||
| } | ||
|
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| type AttrDisplayer struct { | ||
| Attr string | ||
| } | ||
|
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| func (a AttrDisplayer) Display(nodes []*html.Node) { | ||
| for _, node := range nodes { | ||
| attributes := node.Attr | ||
| for _, attr := range attributes { | ||
| if attr.Key == a.Attr { | ||
| val := html.EscapeString(attr.Val) | ||
| fmt.Printf("%s\n", val) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| type JSONDisplayer struct { | ||
| } | ||
|
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| // returns a jsonifiable struct | ||
| func jsonify(node *html.Node) map[string]interface{} { | ||
| vals := map[string]interface{}{} | ||
| if len(node.Attr) > 0 { | ||
| attrs := map[string]string{} | ||
| for _, attr := range node.Attr { | ||
| attrs[attr.Key] = html.EscapeString(attr.Val) | ||
| } | ||
| vals["attrs"] = attrs | ||
| } | ||
| vals["tag"] = node.DataAtom.String() | ||
| children := []interface{}{} | ||
| for child := node.FirstChild; child != nil; child = child.NextSibling { | ||
| switch child.Type { | ||
| case html.ElementNode: | ||
| children = append(children, jsonify(child)) | ||
| case html.TextNode: | ||
| text := strings.TrimSpace(child.Data) | ||
| if text != "" { | ||
| // if there is already text we'll append it | ||
| currText, ok := vals["text"] | ||
| if ok { | ||
| text = fmt.Sprintf("%s %s", currText, text) | ||
| } | ||
| vals["text"] = text | ||
| } | ||
| } | ||
| } | ||
| return vals | ||
| } | ||
|
|
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| func (j JSONDisplayer) Display(nodes []*html.Node) { | ||
| var data []byte | ||
| var err error | ||
| switch len(nodes) { | ||
| case 1: | ||
| jsonNode := jsonify(nodes[0]) | ||
| data, err = json.MarshalIndent(&jsonNode, "", indentString) | ||
| default: | ||
| jsonNodes := []map[string]interface{}{} | ||
| for _, node := range nodes { | ||
| jsonNodes = append(jsonNodes, jsonify(node)) | ||
| } | ||
| data, err = json.MarshalIndent(&jsonNodes, "", indentString) | ||
| } | ||
| if err != nil { | ||
| panic("Could not jsonify nodes") | ||
| } | ||
| fmt.Printf("%s\n", data) | ||
| } | ||
|
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||
| var ( | ||
| // Display function helpers | ||
| displayMatcher *regexp.Regexp = regexp.MustCompile(`\{[^\}]*\}$`) | ||
| textFuncMatcher = regexp.MustCompile(`^text\{\}$`) | ||
| attrFuncMatcher = regexp.MustCompile(`^attr\{([^\}]*)\}$`) | ||
| jsonFuncMatcher = regexp.MustCompile(`^json\{([^\}]*)\}$`) | ||
| ) | ||
|
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| func NewDisplayFunc(text string) (Displayer, error) { | ||
| if !displayMatcher.MatchString(text) { | ||
| return nil, fmt.Errorf("Not a display function") | ||
| } | ||
| switch { | ||
| case textFuncMatcher.MatchString(text): | ||
| return TextDisplayer{}, nil | ||
| case attrFuncMatcher.MatchString(text): | ||
| matches := attrFuncMatcher.FindStringSubmatch(text) | ||
| if len(matches) != 2 { | ||
| return nil, fmt.Errorf("") | ||
| } else { | ||
| return AttrDisplayer{matches[1]}, nil | ||
| } | ||
| case jsonFuncMatcher.MatchString(text): | ||
| return JSONDisplayer{}, nil | ||
| } | ||
| return nil, fmt.Errorf("Not a display function") | ||
| } |
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