437 lines
10 KiB
Go
437 lines
10 KiB
Go
package pretty
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import (
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"sort"
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)
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// Options is Pretty options
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type Options struct {
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// Width is an max column width for single line arrays
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// Default is 80
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Width int
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// Prefix is a prefix for all lines
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// Default is an empty string
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Prefix string
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// Indent is the nested indentation
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// Default is two spaces
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Indent string
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// SortKeys will sort the keys alphabetically
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// Default is false
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SortKeys bool
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}
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// DefaultOptions is the default options for pretty formats.
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var DefaultOptions = &Options{Width: 80, Prefix: "", Indent: " ", SortKeys: false}
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// Pretty converts the input json into a more human readable format where each
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// element is on it's own line with clear indentation.
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func Pretty(json []byte) []byte { return PrettyOptions(json, nil) }
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// PrettyOptions is like Pretty but with customized options.
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func PrettyOptions(json []byte, opts *Options) []byte {
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if opts == nil {
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opts = DefaultOptions
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}
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buf := make([]byte, 0, len(json))
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if len(opts.Prefix) != 0 {
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buf = append(buf, opts.Prefix...)
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}
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buf, _, _, _ = appendPrettyAny(buf, json, 0, true,
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opts.Width, opts.Prefix, opts.Indent, opts.SortKeys,
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0, 0, -1)
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if len(buf) > 0 {
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buf = append(buf, '\n')
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}
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return buf
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}
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// Ugly removes insignificant space characters from the input json byte slice
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// and returns the compacted result.
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func Ugly(json []byte) []byte {
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buf := make([]byte, 0, len(json))
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return ugly(buf, json)
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}
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// UglyInPlace removes insignificant space characters from the input json
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// byte slice and returns the compacted result. This method reuses the
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// input json buffer to avoid allocations. Do not use the original bytes
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// slice upon return.
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func UglyInPlace(json []byte) []byte { return ugly(json, json) }
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func ugly(dst, src []byte) []byte {
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dst = dst[:0]
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for i := 0; i < len(src); i++ {
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if src[i] > ' ' {
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dst = append(dst, src[i])
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if src[i] == '"' {
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for i = i + 1; i < len(src); i++ {
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dst = append(dst, src[i])
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if src[i] == '"' {
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j := i - 1
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for ; ; j-- {
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if src[j] != '\\' {
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break
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}
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}
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if (j-i)%2 != 0 {
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break
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}
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}
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}
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}
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}
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}
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return dst
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}
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func appendPrettyAny(buf, json []byte, i int, pretty bool, width int, prefix, indent string, sortkeys bool, tabs, nl, max int) ([]byte, int, int, bool) {
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for ; i < len(json); i++ {
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if json[i] <= ' ' {
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continue
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}
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if json[i] == '"' {
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return appendPrettyString(buf, json, i, nl)
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}
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if (json[i] >= '0' && json[i] <= '9') || json[i] == '-' {
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return appendPrettyNumber(buf, json, i, nl)
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}
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if json[i] == '{' {
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return appendPrettyObject(buf, json, i, '{', '}', pretty, width, prefix, indent, sortkeys, tabs, nl, max)
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}
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if json[i] == '[' {
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return appendPrettyObject(buf, json, i, '[', ']', pretty, width, prefix, indent, sortkeys, tabs, nl, max)
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}
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switch json[i] {
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case 't':
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return append(buf, 't', 'r', 'u', 'e'), i + 4, nl, true
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case 'f':
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return append(buf, 'f', 'a', 'l', 's', 'e'), i + 5, nl, true
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case 'n':
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return append(buf, 'n', 'u', 'l', 'l'), i + 4, nl, true
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}
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}
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return buf, i, nl, true
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}
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type pair struct {
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kstart, kend int
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vstart, vend int
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}
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type byKey struct {
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sorted bool
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json []byte
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pairs []pair
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}
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func (arr *byKey) Len() int {
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return len(arr.pairs)
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}
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func (arr *byKey) Less(i, j int) bool {
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key1 := arr.json[arr.pairs[i].kstart+1 : arr.pairs[i].kend-1]
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key2 := arr.json[arr.pairs[j].kstart+1 : arr.pairs[j].kend-1]
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return string(key1) < string(key2)
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}
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func (arr *byKey) Swap(i, j int) {
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arr.pairs[i], arr.pairs[j] = arr.pairs[j], arr.pairs[i]
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arr.sorted = true
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}
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func appendPrettyObject(buf, json []byte, i int, open, close byte, pretty bool, width int, prefix, indent string, sortkeys bool, tabs, nl, max int) ([]byte, int, int, bool) {
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var ok bool
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if width > 0 {
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if pretty && open == '[' && max == -1 {
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// here we try to create a single line array
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max := width - (len(buf) - nl)
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if max > 3 {
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s1, s2 := len(buf), i
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buf, i, _, ok = appendPrettyObject(buf, json, i, '[', ']', false, width, prefix, "", sortkeys, 0, 0, max)
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if ok && len(buf)-s1 <= max {
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return buf, i, nl, true
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}
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buf = buf[:s1]
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i = s2
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}
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} else if max != -1 && open == '{' {
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return buf, i, nl, false
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}
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}
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buf = append(buf, open)
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i++
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var pairs []pair
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if open == '{' && sortkeys {
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pairs = make([]pair, 0, 8)
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}
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var n int
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for ; i < len(json); i++ {
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if json[i] <= ' ' {
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continue
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}
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if json[i] == close {
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if pretty {
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if open == '{' && sortkeys {
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buf = sortPairs(json, buf, pairs)
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}
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if n > 0 {
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nl = len(buf)
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buf = append(buf, '\n')
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}
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if buf[len(buf)-1] != open {
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buf = appendTabs(buf, prefix, indent, tabs)
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}
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}
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buf = append(buf, close)
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return buf, i + 1, nl, open != '{'
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}
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if open == '[' || json[i] == '"' {
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if n > 0 {
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buf = append(buf, ',')
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if width != -1 && open == '[' {
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buf = append(buf, ' ')
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}
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}
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var p pair
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if pretty {
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nl = len(buf)
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buf = append(buf, '\n')
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if open == '{' && sortkeys {
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p.kstart = i
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p.vstart = len(buf)
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}
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buf = appendTabs(buf, prefix, indent, tabs+1)
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}
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if open == '{' {
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buf, i, nl, _ = appendPrettyString(buf, json, i, nl)
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if sortkeys {
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p.kend = i
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}
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buf = append(buf, ':')
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if pretty {
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buf = append(buf, ' ')
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}
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}
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buf, i, nl, ok = appendPrettyAny(buf, json, i, pretty, width, prefix, indent, sortkeys, tabs+1, nl, max)
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if max != -1 && !ok {
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return buf, i, nl, false
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}
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if pretty && open == '{' && sortkeys {
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p.vend = len(buf)
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if p.kstart > p.kend || p.vstart > p.vend {
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// bad data. disable sorting
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sortkeys = false
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} else {
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pairs = append(pairs, p)
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}
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}
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i--
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n++
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}
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}
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return buf, i, nl, open != '{'
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}
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func sortPairs(json, buf []byte, pairs []pair) []byte {
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if len(pairs) == 0 {
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return buf
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}
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vstart := pairs[0].vstart
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vend := pairs[len(pairs)-1].vend
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arr := byKey{false, json, pairs}
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sort.Sort(&arr)
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if !arr.sorted {
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return buf
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}
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nbuf := make([]byte, 0, vend-vstart)
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for i, p := range pairs {
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nbuf = append(nbuf, buf[p.vstart:p.vend]...)
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if i < len(pairs)-1 {
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nbuf = append(nbuf, ',')
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nbuf = append(nbuf, '\n')
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}
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}
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return append(buf[:vstart], nbuf...)
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}
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func appendPrettyString(buf, json []byte, i, nl int) ([]byte, int, int, bool) {
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s := i
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i++
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for ; i < len(json); i++ {
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if json[i] == '"' {
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var sc int
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for j := i - 1; j > s; j-- {
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if json[j] == '\\' {
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sc++
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} else {
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break
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}
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}
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if sc%2 == 1 {
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continue
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}
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i++
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break
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}
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}
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return append(buf, json[s:i]...), i, nl, true
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}
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func appendPrettyNumber(buf, json []byte, i, nl int) ([]byte, int, int, bool) {
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s := i
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i++
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for ; i < len(json); i++ {
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if json[i] <= ' ' || json[i] == ',' || json[i] == ':' || json[i] == ']' || json[i] == '}' {
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break
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}
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}
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return append(buf, json[s:i]...), i, nl, true
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}
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func appendTabs(buf []byte, prefix, indent string, tabs int) []byte {
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if len(prefix) != 0 {
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buf = append(buf, prefix...)
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}
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if len(indent) == 2 && indent[0] == ' ' && indent[1] == ' ' {
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for i := 0; i < tabs; i++ {
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buf = append(buf, ' ', ' ')
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}
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} else {
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for i := 0; i < tabs; i++ {
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buf = append(buf, indent...)
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}
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}
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return buf
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}
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// Style is the color style
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type Style struct {
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Key, String, Number [2]string
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True, False, Null [2]string
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Append func(dst []byte, c byte) []byte
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}
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func hexp(p byte) byte {
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switch {
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case p < 10:
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return p + '0'
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default:
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return (p - 10) + 'a'
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}
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}
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// TerminalStyle is for terminals
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var TerminalStyle *Style
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func init() {
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TerminalStyle = &Style{
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Key: [2]string{"\x1B[94m", "\x1B[0m"},
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String: [2]string{"\x1B[92m", "\x1B[0m"},
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Number: [2]string{"\x1B[93m", "\x1B[0m"},
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True: [2]string{"\x1B[96m", "\x1B[0m"},
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False: [2]string{"\x1B[96m", "\x1B[0m"},
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Null: [2]string{"\x1B[91m", "\x1B[0m"},
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Append: func(dst []byte, c byte) []byte {
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if c < ' ' && (c != '\r' && c != '\n' && c != '\t' && c != '\v') {
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dst = append(dst, "\\u00"...)
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dst = append(dst, hexp((c>>4)&0xF))
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return append(dst, hexp((c)&0xF))
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}
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return append(dst, c)
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},
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}
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}
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// Color will colorize the json. The style parma is used for customizing
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// the colors. Passing nil to the style param will use the default
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// TerminalStyle.
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func Color(src []byte, style *Style) []byte {
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if style == nil {
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style = TerminalStyle
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}
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apnd := style.Append
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if apnd == nil {
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apnd = func(dst []byte, c byte) []byte {
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return append(dst, c)
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}
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}
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type stackt struct {
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kind byte
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key bool
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}
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var dst []byte
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var stack []stackt
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for i := 0; i < len(src); i++ {
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if src[i] == '"' {
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key := len(stack) > 0 && stack[len(stack)-1].key
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if key {
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dst = append(dst, style.Key[0]...)
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} else {
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dst = append(dst, style.String[0]...)
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}
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dst = apnd(dst, '"')
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for i = i + 1; i < len(src); i++ {
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dst = apnd(dst, src[i])
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if src[i] == '"' {
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j := i - 1
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for ; ; j-- {
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if src[j] != '\\' {
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break
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}
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}
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if (j-i)%2 != 0 {
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break
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}
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}
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}
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if key {
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dst = append(dst, style.Key[1]...)
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} else {
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dst = append(dst, style.String[1]...)
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}
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} else if src[i] == '{' || src[i] == '[' {
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stack = append(stack, stackt{src[i], src[i] == '{'})
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dst = apnd(dst, src[i])
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} else if (src[i] == '}' || src[i] == ']') && len(stack) > 0 {
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stack = stack[:len(stack)-1]
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dst = apnd(dst, src[i])
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} else if (src[i] == ':' || src[i] == ',') && len(stack) > 0 && stack[len(stack)-1].kind == '{' {
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stack[len(stack)-1].key = !stack[len(stack)-1].key
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dst = apnd(dst, src[i])
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} else {
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var kind byte
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if (src[i] >= '0' && src[i] <= '9') || src[i] == '-' {
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kind = '0'
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dst = append(dst, style.Number[0]...)
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} else if src[i] == 't' {
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kind = 't'
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dst = append(dst, style.True[0]...)
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} else if src[i] == 'f' {
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kind = 'f'
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dst = append(dst, style.False[0]...)
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} else if src[i] == 'n' {
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kind = 'n'
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dst = append(dst, style.Null[0]...)
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} else {
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dst = apnd(dst, src[i])
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}
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if kind != 0 {
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for ; i < len(src); i++ {
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if src[i] <= ' ' || src[i] == ',' || src[i] == ':' || src[i] == ']' || src[i] == '}' {
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i--
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break
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}
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dst = apnd(dst, src[i])
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}
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if kind == '0' {
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dst = append(dst, style.Number[1]...)
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} else if kind == 't' {
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dst = append(dst, style.True[1]...)
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} else if kind == 'f' {
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dst = append(dst, style.False[1]...)
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} else if kind == 'n' {
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dst = append(dst, style.Null[1]...)
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}
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}
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}
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}
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return dst
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}
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