100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
//Copyright 2013 GoGraphviz Authors
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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 gographviz
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import (
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"sort"
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)
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// Attrs represents attributes for an Edge, Node or Graph.
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type Attrs map[Attr]string
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// NewAttrs creates an empty Attributes type.
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func NewAttrs(m map[string]string) (Attrs, error) {
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as := make(Attrs)
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for k, v := range m {
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if err := as.Add(k, v); err != nil {
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return nil, err
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}
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}
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return as, nil
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}
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// Add adds an attribute name and value.
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func (attrs Attrs) Add(field string, value string) error {
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a, err := NewAttr(field)
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if err != nil {
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return err
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}
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attrs.add(a, value)
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return nil
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}
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func (attrs Attrs) add(field Attr, value string) {
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attrs[field] = value
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}
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// Extend adds the attributes into attrs Attrs type overwriting duplicates.
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func (attrs Attrs) Extend(more Attrs) {
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for key, value := range more {
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attrs.add(key, value)
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}
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}
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// Ammend only adds the missing attributes to attrs Attrs type.
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func (attrs Attrs) Ammend(more Attrs) {
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for key, value := range more {
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if _, ok := attrs[key]; !ok {
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attrs.add(key, value)
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}
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}
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}
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func (attrs Attrs) toMap() map[string]string {
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m := make(map[string]string)
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for k, v := range attrs {
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m[string(k)] = v
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}
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return m
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}
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type attrList []Attr
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func (attrs attrList) Len() int { return len(attrs) }
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func (attrs attrList) Less(i, j int) bool {
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return attrs[i] < attrs[j]
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}
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func (attrs attrList) Swap(i, j int) {
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attrs[i], attrs[j] = attrs[j], attrs[i]
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}
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func (attrs Attrs) sortedNames() []Attr {
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keys := make(attrList, 0)
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for key := range attrs {
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keys = append(keys, key)
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}
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sort.Sort(keys)
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return []Attr(keys)
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}
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// Copy returns a copy of the attributes map
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func (attrs Attrs) Copy() Attrs {
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mm := make(Attrs)
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for k, v := range attrs {
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mm[k] = v
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}
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return mm
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}
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