forked from awalterschulze/gographviz
/
attrs.go
89 lines (77 loc) · 2.13 KB
/
attrs.go
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//Copyright 2013 Vastech SA (PTY) LTD
//
//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
//
// http://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 gographviz
import (
"fmt"
"os"
"sort"
"github.com/awalterschulze/gographviz/common"
)
//Represents attributes for an Edge, Node or Graph.
type Attrs map[common.Attribute]string
//Creates an empty Attributes type.
func NewAttrs() Attrs {
return make(Attrs)
}
//Adds an attribute name and value.
func (this Attrs) Add(field string, value string) {
converted, ok := common.StringToAttribute(field)
if !ok {
panic("Field " + field + "is not a valid attribute") // TODO: fix this with proper error handling?
}
this.add(converted, value)
}
func (this Attrs) add(field common.Attribute, value string) {
prev, ok := this[field]
if ok {
fmt.Fprintf(os.Stderr, "WARNING: overwriting field %v value %v, with value %v\n", field, prev, value)
}
this[field] = value
}
//Adds the attributes into this Attrs type overwriting duplicates.
func (this Attrs) Extend(more Attrs) {
for key, value := range more {
this.add(key, value)
}
}
//Only adds the missing attributes to this Attrs type.
func (this Attrs) Ammend(more Attrs) {
for key, value := range more {
if _, ok := this[key]; !ok {
this.add(key, value)
}
}
}
func (this Attrs) SortedNames() []string {
keys := make([]string, 0)
for key := range this {
keys = append(keys, key.String())
}
sort.Strings(keys)
return keys
}
func (this Attrs) Copy() Attrs {
attrs := make(Attrs)
for k, v := range this {
attrs[k] = v
}
return attrs
}
func (this Attrs) toStringMap() map[string]string {
retVal := make(map[string]string)
for k, v := range this {
retVal[k.String()] = v
}
return retVal
}