/
mxgraph.go
187 lines (174 loc) · 4.21 KB
/
mxgraph.go
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package stm2go
import (
"bytes"
"compress/flate"
"encoding/base64"
"encoding/xml"
"io/ioutil"
"log"
"net/url"
"strings"
)
type mxFile struct {
XMLName xml.Name `xml:"mxfile"`
Diagram []byte `xml:"diagram"`
Description []byte `xml:",innerxml"`
}
type mxDiagram struct {
XMLName xml.Name `xml:"diagram"`
GraphModel []byte `xml:"mxGraphModel"`
Description []byte `xml:",innerxml"`
}
type mxGraphModel struct {
XMLName xml.Name `xml:"mxGraphModel"`
Root mxCells `xml:"root"`
}
type mxCells struct {
XMLName xml.Name `xml:"root"`
Cells []mxCell `xml:"mxCell"`
Objects []mxObject `xml:"object"`
}
type mxObject struct {
XMLName xml.Name `xml:"object"`
Label string `xml:"label,attr"`
Id string `xml:"id,attr"`
Type string `xml:"type,attr"`
AnyAttr []xml.Attr `xml:",any,attr"`
Cell mxCell `xml:"mxCell"`
}
type mxCell struct {
XMLName xml.Name `xml:"mxCell"`
Id string `xml:"id,attr"`
Parent string `xml:"parent,attr"`
Value string `xml:"value,attr"`
Style string `xml:"style,attr"`
Vertex bool `xml:"vertex,attr"`
Edge bool `xml:"edge,attr"`
Source string `xml:"source,attr"`
Target string `xml:"target,attr"`
Geometry mxGeometry `xml:"mxGeometry"`
}
type mxGeometry struct {
XMLName xml.Name `xml:"mxGeometry"`
X float64 `xml:"x,attr"`
Y float64 `xml:"y,attr"`
Width float64 `xml:"width,attr"`
Height float64 `xml:"height,attr"`
}
type MxElement struct {
Id string
Type string
Parent string
Value string
Properties map[string]string
Geometry mxGeometry
}
func decode(data []byte) ([]byte, error) {
var b []byte
var s string
var err error
b, err = base64.StdEncoding.DecodeString(string(data))
if err != nil {
return nil, err
}
r := flate.NewReader(bytes.NewReader(b))
defer r.Close()
b, err = ioutil.ReadAll(r)
if err != nil {
return nil, err
}
s, err = url.QueryUnescape(string(b))
if err != nil {
return nil, err
}
return []byte(s), nil
}
func getCells(data []byte) ([]MxElement, error) {
model := mxGraphModel{}
elems := make([]MxElement, 0)
if err := xml.Unmarshal(data, &model); err == nil {
for _, x := range model.Root.Objects {
elem := MxElement{
Id: "",
Type: "",
Parent: "",
Value: "",
Properties: make(map[string]string),
Geometry: mxGeometry{},
}
elem.Id = x.Id
elem.Type = x.Type
elem.Parent = x.Cell.Parent
elem.Value = x.Label
elem.Geometry = x.Cell.Geometry
for _, v := range x.AnyAttr {
elem.Properties[v.Name.Local] = v.Value
}
if x.Type == "" && x.Cell.Vertex {
elem.Type = "vertex"
} else if x.Type == "" && x.Cell.Edge {
elem.Type = "edge"
elem.Properties["source"] = x.Cell.Source
elem.Properties["target"] = x.Cell.Target
}
x.Cell.getStyle(elem.Properties)
elems = append(elems, elem)
}
for _, x := range model.Root.Cells {
elem := MxElement{
Id: "",
Type: "",
Parent: "",
Value: "",
Properties: make(map[string]string),
Geometry: mxGeometry{},
}
elem.Id = x.Id
elem.Parent = x.Parent
elem.Value = x.Value
elem.Geometry = x.Geometry
if x.Vertex {
elem.Type = "vertex"
} else if x.Edge {
elem.Type = "edge"
elem.Properties["source"] = x.Source
elem.Properties["target"] = x.Target
}
x.getStyle(elem.Properties)
elems = append(elems, elem)
}
return elems, nil
} else {
return nil, err
}
}
func (c *mxCell) getStyle(properties map[string]string) {
for _, x := range strings.Split(c.Style, ";") {
e := strings.Split(x, "=")
if e[0] != "" {
switch len(e) {
case 1:
properties[e[0]] = ""
case 2:
properties[e[0]] = e[1]
default:
log.Panic("Error: Style in Cell")
}
}
}
}
func GetGraphModel(data []byte) ([]MxElement, error) {
model := mxFile{}
if err := xml.Unmarshal(data, &model); err == nil {
diagram := mxDiagram{}
if s, err := decode(model.Diagram); err == nil {
return getCells(s)
} else if err := xml.Unmarshal(model.Description, &diagram); err == nil {
return getCells(diagram.Description)
} else {
return nil, err
}
} else {
return getCells(data)
}
}