161 lines
3.4 KiB
Go
161 lines
3.4 KiB
Go
// Copyright 2013 Google Inc. All rights reserved.
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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 pretty
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import (
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"bytes"
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"strconv"
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"strings"
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)
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type node interface {
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WriteTo(w *bytes.Buffer, indent string, cfg *Config)
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}
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func compactString(n node) string {
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switch k := n.(type) {
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case stringVal:
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return string(k)
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case rawVal:
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return string(k)
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}
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buf := new(bytes.Buffer)
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n.WriteTo(buf, "", &Config{Compact: true})
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return buf.String()
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}
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type stringVal string
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func (str stringVal) WriteTo(w *bytes.Buffer, indent string, cfg *Config) {
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w.WriteString(strconv.Quote(string(str)))
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}
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type rawVal string
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func (r rawVal) WriteTo(w *bytes.Buffer, indent string, cfg *Config) {
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w.WriteString(string(r))
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}
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type keyval struct {
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key string
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val node
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}
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type keyvals []keyval
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func (l keyvals) Len() int { return len(l) }
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func (l keyvals) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
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func (l keyvals) Less(i, j int) bool { return l[i].key < l[j].key }
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func (l keyvals) WriteTo(w *bytes.Buffer, indent string, cfg *Config) {
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w.WriteByte('{')
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switch {
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case cfg.Compact:
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// All on one line:
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for i, kv := range l {
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if i > 0 {
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w.WriteByte(',')
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}
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w.WriteString(kv.key)
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w.WriteByte(':')
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kv.val.WriteTo(w, indent, cfg)
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}
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case cfg.Diffable:
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w.WriteByte('\n')
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inner := indent + " "
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// Each value gets its own line:
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for _, kv := range l {
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w.WriteString(inner)
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w.WriteString(kv.key)
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w.WriteString(": ")
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kv.val.WriteTo(w, inner, cfg)
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w.WriteString(",\n")
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}
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w.WriteString(indent)
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default:
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keyWidth := 0
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for _, kv := range l {
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if kw := len(kv.key); kw > keyWidth {
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keyWidth = kw
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}
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}
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alignKey := indent + " "
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alignValue := strings.Repeat(" ", keyWidth)
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inner := alignKey + alignValue + " "
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// First and last line shared with bracket:
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for i, kv := range l {
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if i > 0 {
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w.WriteString(",\n")
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w.WriteString(alignKey)
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}
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w.WriteString(kv.key)
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w.WriteString(": ")
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w.WriteString(alignValue[len(kv.key):])
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kv.val.WriteTo(w, inner, cfg)
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}
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}
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w.WriteByte('}')
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}
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type list []node
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func (l list) WriteTo(w *bytes.Buffer, indent string, cfg *Config) {
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if max := cfg.ShortList; max > 0 {
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short := compactString(l)
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if len(short) <= max {
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w.WriteString(short)
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return
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}
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}
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w.WriteByte('[')
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switch {
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case cfg.Compact:
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// All on one line:
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for i, v := range l {
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if i > 0 {
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w.WriteByte(',')
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}
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v.WriteTo(w, indent, cfg)
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}
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case cfg.Diffable:
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w.WriteByte('\n')
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inner := indent + " "
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// Each value gets its own line:
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for _, v := range l {
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w.WriteString(inner)
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v.WriteTo(w, inner, cfg)
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w.WriteString(",\n")
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}
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w.WriteString(indent)
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default:
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inner := indent + " "
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// First and last line shared with bracket:
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for i, v := range l {
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if i > 0 {
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w.WriteString(",\n")
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w.WriteString(inner)
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}
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v.WriteTo(w, inner, cfg)
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}
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}
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w.WriteByte(']')
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}
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