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