734 lines
19 KiB
Go
734 lines
19 KiB
Go
// Copyright (c) 2014 The sortutil Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package strutil collects utils supplemental to the standard strings package.
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package strutil // import "modernc.org/strutil"
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import (
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"bytes"
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"encoding/base32"
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"encoding/base64"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"reflect"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"sync"
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)
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// Base32ExtDecode decodes base32 extended (RFC 4648) text to binary data.
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func Base32ExtDecode(text []byte) (data []byte, err error) {
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n := base32.HexEncoding.DecodedLen(len(text))
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data = make([]byte, n)
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decoder := base32.NewDecoder(base32.HexEncoding, bytes.NewBuffer(text))
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if n, err = decoder.Read(data); err != nil {
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n = 0
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}
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data = data[:n]
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return
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}
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// Base32ExtEncode encodes binary data to base32 extended (RFC 4648) encoded text.
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func Base32ExtEncode(data []byte) (text []byte) {
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n := base32.HexEncoding.EncodedLen(len(data))
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buf := bytes.NewBuffer(make([]byte, 0, n))
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encoder := base32.NewEncoder(base32.HexEncoding, buf)
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encoder.Write(data)
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encoder.Close()
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if buf.Len() != n {
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panic("internal error")
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}
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return buf.Bytes()
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}
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// Base64Decode decodes base64 text to binary data.
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func Base64Decode(text []byte) (data []byte, err error) {
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n := base64.StdEncoding.DecodedLen(len(text))
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data = make([]byte, n)
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decoder := base64.NewDecoder(base64.StdEncoding, bytes.NewBuffer(text))
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if n, err = decoder.Read(data); err != nil {
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n = 0
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}
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data = data[:n]
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return
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}
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// Base64Encode encodes binary data to base64 encoded text.
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func Base64Encode(data []byte) (text []byte) {
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n := base64.StdEncoding.EncodedLen(len(data))
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buf := bytes.NewBuffer(make([]byte, 0, n))
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encoder := base64.NewEncoder(base64.StdEncoding, buf)
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encoder.Write(data)
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encoder.Close()
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if buf.Len() != n {
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panic("internal error")
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}
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return buf.Bytes()
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}
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// Formatter is an io.Writer extended by a fmt.Printf like function Format
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type Formatter interface {
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io.Writer
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Format(format string, args ...interface{}) (n int, errno error)
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}
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type indentFormatter struct {
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io.Writer
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indent []byte
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indentLevel int
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state int
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}
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const (
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st0 = iota
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stBOL
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stPERC
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stBOLPERC
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)
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// IndentFormatter returns a new Formatter which interprets %i and %u in the
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// Format() format string as indent and undent commands. The commands can
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// nest. The Formatter writes to io.Writer 'w' and inserts one 'indent'
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// string per current indent level value.
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// Behaviour of commands reaching negative indent levels is undefined.
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// IndentFormatter(os.Stdout, "\t").Format("abc%d%%e%i\nx\ny\n%uz\n", 3)
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// output:
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// abc3%e
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// x
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// y
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// z
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// The Go quoted string literal form of the above is:
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// "abc%%e\n\tx\n\tx\nz\n"
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// The commands can be scattered between separate invocations of Format(),
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// i.e. the formatter keeps track of the indent level and knows if it is
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// positioned on start of a line and should emit indentation(s).
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// The same output as above can be produced by e.g.:
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// f := IndentFormatter(os.Stdout, " ")
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// f.Format("abc%d%%e%i\nx\n", 3)
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// f.Format("y\n%uz\n")
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func IndentFormatter(w io.Writer, indent string) Formatter {
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return &indentFormatter{w, []byte(indent), 0, stBOL}
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}
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func (f *indentFormatter) format(flat bool, format string, args ...interface{}) (n int, errno error) {
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buf := []byte{}
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for i := 0; i < len(format); i++ {
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c := format[i]
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switch f.state {
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case st0:
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switch c {
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case '\n':
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cc := c
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if flat && f.indentLevel != 0 {
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cc = ' '
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}
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buf = append(buf, cc)
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f.state = stBOL
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case '%':
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f.state = stPERC
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default:
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buf = append(buf, c)
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}
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case stBOL:
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switch c {
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case '\n':
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cc := c
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if flat && f.indentLevel != 0 {
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cc = ' '
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}
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buf = append(buf, cc)
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case '%':
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f.state = stBOLPERC
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default:
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if !flat {
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for i := 0; i < f.indentLevel; i++ {
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buf = append(buf, f.indent...)
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}
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}
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buf = append(buf, c)
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f.state = st0
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}
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case stBOLPERC:
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switch c {
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case 'i':
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f.indentLevel++
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f.state = stBOL
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case 'u':
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f.indentLevel--
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f.state = stBOL
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default:
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if !flat {
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for i := 0; i < f.indentLevel; i++ {
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buf = append(buf, f.indent...)
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}
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}
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buf = append(buf, '%', c)
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f.state = st0
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}
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case stPERC:
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switch c {
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case 'i':
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f.indentLevel++
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f.state = st0
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case 'u':
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f.indentLevel--
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f.state = st0
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default:
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buf = append(buf, '%', c)
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f.state = st0
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}
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default:
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panic("unexpected state")
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}
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}
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switch f.state {
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case stPERC, stBOLPERC:
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buf = append(buf, '%')
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}
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return f.Write([]byte(fmt.Sprintf(string(buf), args...)))
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}
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func (f *indentFormatter) Format(format string, args ...interface{}) (n int, errno error) {
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return f.format(false, format, args...)
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}
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type flatFormatter indentFormatter
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// FlatFormatter returns a newly created Formatter with the same functionality as the one returned
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// by IndentFormatter except it allows a newline in the 'format' string argument of Format
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// to pass through iff indent level is currently zero.
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//
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// If indent level is non-zero then such new lines are changed to a space character.
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// There is no indent string, the %i and %u format verbs are used solely to determine the indent level.
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//
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// The FlatFormatter is intended for flattening of normally nested structure textual representation to
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// a one top level structure per line form.
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// FlatFormatter(os.Stdout, " ").Format("abc%d%%e%i\nx\ny\n%uz\n", 3)
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// output in the form of a Go quoted string literal:
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// "abc3%%e x y z\n"
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func FlatFormatter(w io.Writer) Formatter {
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return (*flatFormatter)(IndentFormatter(w, "").(*indentFormatter))
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}
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func (f *flatFormatter) Format(format string, args ...interface{}) (n int, errno error) {
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return (*indentFormatter)(f).format(true, format, args...)
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}
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// Pool handles aligning of strings having equal values to the same string instance.
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// Intended use is to conserve some memory e.g. where a large number of identically valued strings
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// with non identical backing arrays may exists in several semantically distinct instances of some structs.
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// Pool is *not* concurrent access safe. It doesn't handle common prefix/suffix aligning,
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// e.g. having s1 == "abc" and s2 == "bc", s2 is not automatically aligned as s1[1:].
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type Pool struct {
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pool map[string]string
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}
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// NewPool returns a newly created Pool.
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func NewPool() *Pool {
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return &Pool{map[string]string{}}
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}
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// Align returns a string with the same value as its argument. It guarantees that
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// all aligned strings share a single instance in memory.
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func (p *Pool) Align(s string) string {
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if a, ok := p.pool[s]; ok {
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return a
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}
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s = StrPack(s)
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p.pool[s] = s
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return s
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}
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// Count returns the number of items in the pool.
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func (p *Pool) Count() int {
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return len(p.pool)
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}
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// GoPool is a concurrent access safe version of Pool.
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type GoPool struct {
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pool map[string]string
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rwm *sync.RWMutex
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}
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// NewGoPool returns a newly created GoPool.
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func NewGoPool() (p *GoPool) {
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return &GoPool{map[string]string{}, &sync.RWMutex{}}
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}
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// Align returns a string with the same value as its argument. It guarantees that
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// all aligned strings share a single instance in memory.
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func (p *GoPool) Align(s string) (y string) {
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if s != "" {
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p.rwm.RLock() // R++
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if a, ok := p.pool[s]; ok { // found
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p.rwm.RUnlock() // R--
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return a
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}
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p.rwm.RUnlock() // R--
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// not found but with a race condition, retry within a write lock
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p.rwm.Lock() // W++
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defer p.rwm.Unlock() // W--
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if a, ok := p.pool[s]; ok { // done in a race
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return a
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}
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// we won
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s = StrPack(s)
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p.pool[s] = s
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return s
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}
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return
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}
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// Count returns the number of items in the pool.
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func (p *GoPool) Count() int {
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return len(p.pool)
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}
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// Dict is a string <-> id bijection. Dict is *not* concurrent access safe for assigning new ids
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// to strings not yet contained in the bijection.
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// Id for an empty string is guaranteed to be 0,
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// thus Id for any non empty string is guaranteed to be non zero.
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type Dict struct {
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si map[string]int
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is []string
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}
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// NewDict returns a newly created Dict.
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func NewDict() (d *Dict) {
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d = &Dict{map[string]int{}, []string{}}
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d.Id("")
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return
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}
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// Count returns the number of items in the dict.
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func (d *Dict) Count() int {
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return len(d.is)
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}
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// Id maps string s to its numeric identificator.
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func (d *Dict) Id(s string) (y int) {
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if y, ok := d.si[s]; ok {
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return y
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}
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s = StrPack(s)
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y = len(d.is)
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d.si[s] = y
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d.is = append(d.is, s)
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return
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}
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// S maps an id to its string value and ok == true. Id values not contained in the bijection
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// return "", false.
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func (d *Dict) S(id int) (s string, ok bool) {
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if id >= len(d.is) {
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return "", false
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}
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return d.is[id], true
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}
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// GoDict is a concurrent access safe version of Dict.
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type GoDict struct {
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si map[string]int
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is []string
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rwm *sync.RWMutex
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}
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// NewGoDict returns a newly created GoDict.
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func NewGoDict() (d *GoDict) {
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d = &GoDict{map[string]int{}, []string{}, &sync.RWMutex{}}
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d.Id("")
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return
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}
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// Count returns the number of items in the dict.
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func (d *GoDict) Count() int {
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return len(d.is)
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}
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// Id maps string s to its numeric identificator. The implementation honors getting
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// an existing id at the cost of assigning a new one.
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func (d *GoDict) Id(s string) (y int) {
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d.rwm.RLock() // R++
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if y, ok := d.si[s]; ok { // found
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d.rwm.RUnlock() // R--
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return y
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}
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d.rwm.RUnlock() // R--
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// not found but with a race condition
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d.rwm.Lock() // W++ recheck with write lock
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defer d.rwm.Unlock() // W--
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if y, ok := d.si[s]; ok { // some other goroutine won already
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return y
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}
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// a race free not found state => insert the string
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s = StrPack(s)
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y = len(d.is)
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d.si[s] = y
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d.is = append(d.is, s)
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return
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}
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// S maps an id to its string value and ok == true. Id values not contained in the bijection
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// return "", false.
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func (d *GoDict) S(id int) (s string, ok bool) {
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d.rwm.RLock() // R++
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defer d.rwm.RUnlock() // R--
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if id >= len(d.is) {
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return "", false
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}
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return d.is[id], true
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}
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// StrPack returns a new instance of s which is tightly packed in memory.
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// It is intended for avoiding the situation where having a live reference
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// to a string slice over an unreferenced biger underlying string keeps the biger one
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// in memory anyway - it can't be GCed.
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func StrPack(s string) string {
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return string([]byte(s)) // T(U(T)) intentional.
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}
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// JoinFields returns strings in flds joined by sep. Flds may contain arbitrary
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// bytes, including the sep as they are safely escaped. JoinFields panics if
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// sep is the backslash character or if len(sep) != 1.
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func JoinFields(flds []string, sep string) string {
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if len(sep) != 1 || sep == "\\" {
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panic("invalid separator")
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}
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a := make([]string, len(flds))
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for i, v := range flds {
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v = strings.Replace(v, "\\", "\\0", -1)
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a[i] = strings.Replace(v, sep, "\\1", -1)
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}
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return strings.Join(a, sep)
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}
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// SplitFields splits s, which must be produced by JoinFields using the same
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// sep, into flds. SplitFields panics if sep is the backslash character or if
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// len(sep) != 1.
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func SplitFields(s, sep string) (flds []string) {
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if len(sep) != 1 || sep == "\\" {
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panic("invalid separator")
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}
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a := strings.Split(s, sep)
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r := make([]string, len(a))
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for i, v := range a {
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v = strings.Replace(v, "\\1", sep, -1)
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r[i] = strings.Replace(v, "\\0", "\\", -1)
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}
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return r
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}
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// PrettyPrintHooks allow to customize the result of PrettyPrint for types
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// listed in the map value.
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type PrettyPrintHooks map[reflect.Type]func(f Formatter, v interface{}, prefix, suffix string)
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// PrettyString returns the output of PrettyPrint as a string.
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func PrettyString(v interface{}, prefix, suffix string, hooks PrettyPrintHooks) string {
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var b bytes.Buffer
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PrettyPrint(&b, v, prefix, suffix, hooks)
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return b.String()
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}
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// PrettyPrint pretty prints v to w. Zero values and unexported struct fields
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// are omitted.
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//
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// Force printing of zero values of struct fields by including in the field tag
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// PrettyPrint:"zero".
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//
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// Enable using a String method, if any, of a struct field type by including in
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// the field tag PrettyPrint:"stringer".
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//
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// The tags can be combined as in PrettyPrint:"zero,stringer". The order is not
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// important, so PrettyPrint:stringer,zero has the same effect.
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//
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// A hook attached to the field type has priority over the struct field tag
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// described above.
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func PrettyPrint(w io.Writer, v interface{}, prefix, suffix string, hooks PrettyPrintHooks) {
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if v == nil {
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return
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}
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f := IndentFormatter(w, "· ")
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defer func() {
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if e := recover(); e != nil {
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f.Format("\npanic: %v", e)
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}
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}()
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prettyPrint(nil, f, prefix, suffix, v, hooks, false, false)
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}
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func prettyPrint(protect map[interface{}]struct{}, sf Formatter, prefix, suffix string, v interface{}, hooks PrettyPrintHooks, zero, stringer bool) {
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if v == nil {
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return
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}
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rt := reflect.TypeOf(v)
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if handler := hooks[rt]; handler != nil {
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handler(sf, v, prefix, suffix)
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return
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}
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rv := reflect.ValueOf(v)
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if stringer {
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if _, ok := v.(fmt.Stringer); ok {
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sf.Format("%s%s", prefix, v)
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sf.Format(suffix)
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return
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}
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}
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switch rt.Kind() {
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case reflect.Slice:
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if rv.Len() == 0 && !zero {
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return
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}
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sf.Format("%s[]%T{ // len %d%i\n", prefix, rv.Index(0).Interface(), rv.Len())
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for i := 0; i < rv.Len(); i++ {
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prettyPrint(protect, sf, fmt.Sprintf("%d: ", i), ",\n", rv.Index(i).Interface(), hooks, false, false)
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}
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suffix = strings.Replace(suffix, "%", "%%", -1)
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sf.Format("%u}" + suffix)
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case reflect.Array:
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if reflect.Zero(rt).Interface() == rv.Interface() && !zero {
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return
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}
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sf.Format("%s[%d]%T{%i\n", prefix, rv.Len(), rv.Index(0).Interface())
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for i := 0; i < rv.Len(); i++ {
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prettyPrint(protect, sf, fmt.Sprintf("%d: ", i), ",\n", rv.Index(i).Interface(), hooks, false, false)
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}
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suffix = strings.Replace(suffix, "%", "%%", -1)
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sf.Format("%u}" + suffix)
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case reflect.Struct:
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if rt.NumField() == 0 {
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return
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}
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if reflect.DeepEqual(reflect.Zero(rt).Interface(), rv.Interface()) && !zero {
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return
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}
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sf.Format("%s%T{%i\n", prefix, v)
|
|
for i := 0; i < rt.NumField(); i++ {
|
|
f := rv.Field(i)
|
|
if !f.CanInterface() {
|
|
continue
|
|
}
|
|
|
|
var stringer, zero bool
|
|
ft := rt.Field(i)
|
|
if tag, ok := ft.Tag.Lookup("PrettyPrint"); ok {
|
|
a := strings.Split(tag, ",")
|
|
for _, v := range a {
|
|
switch strings.TrimSpace(v) {
|
|
case "stringer":
|
|
stringer = true
|
|
case "zero":
|
|
zero = true
|
|
}
|
|
}
|
|
}
|
|
prettyPrint(protect, sf, fmt.Sprintf("%s: ", rt.Field(i).Name), ",\n", f.Interface(), hooks, zero, stringer)
|
|
}
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%u}" + suffix)
|
|
case reflect.Ptr:
|
|
if rv.IsNil() && !zero {
|
|
return
|
|
}
|
|
|
|
rvi := rv.Interface()
|
|
if _, ok := protect[rvi]; ok {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s&%T{ /* recursive/repetitive pointee not shown */ }"+suffix, prefix, rv.Elem().Interface())
|
|
return
|
|
}
|
|
|
|
if protect == nil {
|
|
protect = map[interface{}]struct{}{}
|
|
}
|
|
protect[rvi] = struct{}{}
|
|
prettyPrint(protect, sf, prefix+"&", suffix, rv.Elem().Interface(), hooks, false, false)
|
|
case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int8:
|
|
if v := rv.Int(); v != 0 || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, v)
|
|
}
|
|
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint8:
|
|
if v := rv.Uint(); v != 0 || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, v)
|
|
}
|
|
case reflect.Float32, reflect.Float64:
|
|
if v := rv.Float(); v != 0 || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, v)
|
|
}
|
|
case reflect.Complex64, reflect.Complex128:
|
|
if v := rv.Complex(); v != 0 || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, v)
|
|
}
|
|
case reflect.Uintptr:
|
|
if v := rv.Uint(); v != 0 || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, v)
|
|
}
|
|
case reflect.UnsafePointer:
|
|
s := fmt.Sprintf("%p", rv.Interface())
|
|
if s == "0x0" && !zero {
|
|
return
|
|
}
|
|
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%s"+suffix, prefix, s)
|
|
case reflect.Bool:
|
|
if v := rv.Bool(); v || zero {
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%v"+suffix, prefix, rv.Bool())
|
|
}
|
|
case reflect.String:
|
|
s := rv.Interface().(string)
|
|
if s == "" && !zero {
|
|
return
|
|
}
|
|
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%q"+suffix, prefix, s)
|
|
case reflect.Chan:
|
|
if reflect.Zero(rt).Interface() == rv.Interface() && !zero {
|
|
return
|
|
}
|
|
|
|
c := rv.Cap()
|
|
s := ""
|
|
if c != 0 {
|
|
s = fmt.Sprintf("// capacity: %d", c)
|
|
}
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%s%s %s%s"+suffix, prefix, rt.ChanDir(), rt.Elem().Name(), s)
|
|
case reflect.Func:
|
|
if rv.IsNil() && !zero {
|
|
return
|
|
}
|
|
|
|
var in, out []string
|
|
for i := 0; i < rt.NumIn(); i++ {
|
|
x := reflect.Zero(rt.In(i))
|
|
in = append(in, fmt.Sprintf("%T", x.Interface()))
|
|
}
|
|
if rt.IsVariadic() {
|
|
i := len(in) - 1
|
|
in[i] = "..." + in[i][2:]
|
|
}
|
|
for i := 0; i < rt.NumOut(); i++ {
|
|
out = append(out, rt.Out(i).Name())
|
|
}
|
|
s := "(" + strings.Join(in, ", ") + ")"
|
|
t := strings.Join(out, ", ")
|
|
if len(out) > 1 {
|
|
t = "(" + t + ")"
|
|
}
|
|
if t != "" {
|
|
t = " " + t
|
|
}
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%sfunc%s%s { ... }"+suffix, prefix, s, t)
|
|
case reflect.Map:
|
|
keys := rv.MapKeys()
|
|
if len(keys) == 0 && !zero {
|
|
return
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
nf := IndentFormatter(&buf, "· ")
|
|
var skeys []string
|
|
for i, k := range keys {
|
|
prettyPrint(protect, nf, "", "", k.Interface(), hooks, false, false)
|
|
skeys = append(skeys, fmt.Sprintf("%s%10d", buf.Bytes(), i))
|
|
buf.Reset()
|
|
}
|
|
sort.Strings(skeys)
|
|
sf.Format("%s%T{%i\n", prefix, v)
|
|
for _, k := range skeys {
|
|
si := strings.TrimSpace(k[len(k)-10:])
|
|
k = k[:len(k)-10]
|
|
n, _ := strconv.ParseUint(si, 10, 64)
|
|
mv := rv.MapIndex(keys[n])
|
|
prettyPrint(protect, sf, fmt.Sprintf("%s: ", k), ",\n", mv.Interface(), hooks, false, false)
|
|
}
|
|
suffix = strings.Replace(suffix, "%", "%%", -1)
|
|
sf.Format("%u}" + suffix)
|
|
}
|
|
}
|
|
|
|
// Gopath returns the value of the $GOPATH environment variable or its default
|
|
// value if not set.
|
|
func Gopath() string {
|
|
if r := os.Getenv("GOPATH"); r != "" {
|
|
return r
|
|
}
|
|
|
|
// go1.8: https://github.com/golang/go/blob/74628a8b9f102bddd5078ee426efe0fd57033115/doc/code.html#L122
|
|
switch runtime.GOOS {
|
|
case "plan9":
|
|
return os.Getenv("home")
|
|
case "windows":
|
|
return filepath.Join(os.Getenv("USERPROFILE"), "go")
|
|
default:
|
|
return filepath.Join(os.Getenv("HOME"), "go")
|
|
}
|
|
}
|
|
|
|
// Homepath returns the user's home directory path.
|
|
func Homepath() string {
|
|
// go1.8: https://github.com/golang/go/blob/74628a8b9f102bddd5078ee426efe0fd57033115/doc/code.html#L122
|
|
switch runtime.GOOS {
|
|
case "plan9":
|
|
return os.Getenv("home")
|
|
case "windows":
|
|
return os.Getenv("USERPROFILE")
|
|
default:
|
|
return os.Getenv("HOME")
|
|
}
|
|
}
|
|
|
|
// ImportPath returns the import path of the caller or an error, if any.
|
|
func ImportPath() (string, error) {
|
|
_, file, _, ok := runtime.Caller(1)
|
|
if !ok {
|
|
return "", fmt.Errorf("runtime.Caller failed")
|
|
}
|
|
|
|
gopath := Gopath()
|
|
for _, v := range filepath.SplitList(gopath) {
|
|
gp := filepath.Join(v, "src")
|
|
path, err := filepath.Rel(gp, file)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
return filepath.Dir(path), nil
|
|
}
|
|
|
|
return "", fmt.Errorf("cannot determine import path using GOPATH=%s", gopath)
|
|
}
|