Merge pull request #6625 from vieux/remove_dockerscript

remove dockerscript

pkg/dockerscript/MAINTAINERS

@@ -1 +0,0 @@
-Solomon Hykes <solomon@docker.com> (@shykes)

pkg/dockerscript/dockerscript.go

@@ -1,121 +0,0 @@
-package dockerscript
-
-import (
-	"fmt"
-	"github.com/dotcloud/docker/pkg/dockerscript/scanner"
-	"io"
-	"strings"
-)
-
-type Command struct {
-	Args       []string
-	Children   []*Command
-	Background bool
-}
-
-type Scanner struct {
-	scanner.Scanner
-	commentLine bool
-}
-
-func Parse(src io.Reader) ([]*Command, error) {
-	s := &Scanner{}
-	s.Init(src)
-	s.Whitespace = 1<<'\t' | 1<<' '
-	s.Mode = scanner.ScanStrings | scanner.ScanRawStrings | scanner.ScanIdents
-	expr, err := parse(s, "")
-	if err != nil {
-		return nil, fmt.Errorf("line %d:%d: %v\n", s.Pos().Line, s.Pos().Column, err)
-	}
-	return expr, nil
-}
-
-func (cmd *Command) subString(depth int) string {
-	var prefix string
-	for i := 0; i < depth; i++ {
-		prefix += "  "
-	}
-	s := prefix + strings.Join(cmd.Args, ", ")
-	if len(cmd.Children) > 0 {
-		s += " {\n"
-		for _, subcmd := range cmd.Children {
-			s += subcmd.subString(depth + 1)
-		}
-		s += prefix + "}"
-	}
-	s += "\n"
-	return s
-}
-
-func (cmd *Command) String() string {
-	return cmd.subString(0)
-}
-
-func parseArgs(s *Scanner) ([]string, rune, error) {
-	var parseError error
-	// FIXME: we overwrite previously set error
-	s.Error = func(s *scanner.Scanner, msg string) {
-		parseError = fmt.Errorf(msg)
-		// parseError = fmt.Errorf("line %d:%d: %s\n", s.Pos().Line, s.Pos().Column, msg)
-	}
-	var args []string
-	tok := s.Scan()
-	for tok != scanner.EOF {
-		if parseError != nil {
-			return args, tok, parseError
-		}
-		text := s.TokenText()
-		// Toggle line comment
-		if strings.HasPrefix(text, "#") {
-			s.commentLine = true
-		} else if text == "\n" || text == "\r" {
-			s.commentLine = false
-			return args, tok, nil
-		}
-		if !s.commentLine {
-			if text == "{" || text == "}" || text == "\n" || text == "\r" || text == ";" || text == "&" {
-				return args, tok, nil
-			}
-			args = append(args, text)
-		}
-		tok = s.Scan()
-	}
-	return args, tok, nil
-}
-
-func parse(s *Scanner, opener string) (expr []*Command, err error) {
-	/*
-		defer func() {
-			fmt.Printf("parse() returned %d commands:\n", len(expr))
-			for _, c := range expr {
-				fmt.Printf("\t----> %s\n", c)
-			}
-		}()
-	*/
-	for {
-		args, tok, err := parseArgs(s)
-		if err != nil {
-			return nil, err
-		}
-		cmd := &Command{Args: args}
-		afterArgs := s.TokenText()
-		if afterArgs == "{" {
-			children, err := parse(s, "{")
-			if err != nil {
-				return nil, err
-			}
-			cmd.Children = children
-		} else if afterArgs == "}" && opener != "{" {
-			return nil, fmt.Errorf("unexpected end of block '}'")
-		} else if afterArgs == "&" {
-			cmd.Background = true
-		}
-		if len(cmd.Args) > 0 || len(cmd.Children) > 0 {
-			expr = append(expr, cmd)
-		}
-		if tok == scanner.EOF || afterArgs == "}" {
-			break
-		}
-	}
-	return expr, nil
-}

pkg/dockerscript/scanner/extra.go

@@ -1,21 +0,0 @@
-package scanner
-
-import (
-	"strings"
-	"unicode"
-)
-
-// extra functions used to hijack the upstream text/scanner
-
-func detectIdent(ch rune) bool {
-	if unicode.IsLetter(ch) {
-		return true
-	}
-	if unicode.IsDigit(ch) {
-		return true
-	}
-	if strings.ContainsRune("_:/+-@%^.!=", ch) {
-		return true
-	}
-	return false
-}

pkg/dockerscript/scanner/scanner.go

@@ -1,673 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package scanner provides a scanner and tokenizer for UTF-8-encoded text.
-// It takes an io.Reader providing the source, which then can be tokenized
-// through repeated calls to the Scan function.  For compatibility with
-// existing tools, the NUL character is not allowed. If the first character
-// in the source is a UTF-8 encoded byte order mark (BOM), it is discarded.
-//
-// By default, a Scanner skips white space and Go comments and recognizes all
-// literals as defined by the Go language specification.  It may be
-// customized to recognize only a subset of those literals and to recognize
-// different white space characters.
-//
-// Basic usage pattern:
-//
-//	var s scanner.Scanner
-//	s.Init(src)
-//	tok := s.Scan()
-//	for tok != scanner.EOF {
-//		// do something with tok
-//		tok = s.Scan()
-//	}
-//
-package scanner
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"os"
-	"unicode/utf8"
-)
-
-// TODO(gri): Consider changing this to use the new (token) Position package.
-
-// A source position is represented by a Position value.
-// A position is valid if Line > 0.
-type Position struct {
-	Filename string // filename, if any
-	Offset   int    // byte offset, starting at 0
-	Line     int    // line number, starting at 1
-	Column   int    // column number, starting at 1 (character count per line)
-}
-
-// IsValid returns true if the position is valid.
-func (pos *Position) IsValid() bool { return pos.Line > 0 }
-
-func (pos Position) String() string {
-	s := pos.Filename
-	if pos.IsValid() {
-		if s != "" {
-			s += ":"
-		}
-		s += fmt.Sprintf("%d:%d", pos.Line, pos.Column)
-	}
-	if s == "" {
-		s = "???"
-	}
-	return s
-}
-
-// Predefined mode bits to control recognition of tokens. For instance,
-// to configure a Scanner such that it only recognizes (Go) identifiers,
-// integers, and skips comments, set the Scanner's Mode field to:
-//
-//	ScanIdents | ScanInts | SkipComments
-//
-const (
-	ScanIdents     = 1 << -Ident
-	ScanInts       = 1 << -Int
-	ScanFloats     = 1 << -Float // includes Ints
-	ScanChars      = 1 << -Char
-	ScanStrings    = 1 << -String
-	ScanRawStrings = 1 << -RawString
-	ScanComments   = 1 << -Comment
-	SkipComments   = 1 << -skipComment // if set with ScanComments, comments become white space
-	GoTokens       = ScanIdents | ScanFloats | ScanChars | ScanStrings | ScanRawStrings | ScanComments | SkipComments
-)
-
-// The result of Scan is one of the following tokens or a Unicode character.
-const (
-	EOF = -(iota + 1)
-	Ident
-	Int
-	Float
-	Char
-	String
-	RawString
-	Comment
-	skipComment
-)
-
-var tokenString = map[rune]string{
-	EOF:       "EOF",
-	Ident:     "Ident",
-	Int:       "Int",
-	Float:     "Float",
-	Char:      "Char",
-	String:    "String",
-	RawString: "RawString",
-	Comment:   "Comment",
-}
-
-// TokenString returns a printable string for a token or Unicode character.
-func TokenString(tok rune) string {
-	if s, found := tokenString[tok]; found {
-		return s
-	}
-	return fmt.Sprintf("%q", string(tok))
-}
-
-// GoWhitespace is the default value for the Scanner's Whitespace field.
-// Its value selects Go's white space characters.
-const GoWhitespace = 1<<'\t' | 1<<'\n' | 1<<'\r' | 1<<' '
-
-const bufLen = 1024 // at least utf8.UTFMax
-
-// A Scanner implements reading of Unicode characters and tokens from an io.Reader.
-type Scanner struct {
-	// Input
-	src io.Reader
-
-	// Source buffer
-	srcBuf [bufLen + 1]byte // +1 for sentinel for common case of s.next()
-	srcPos int              // reading position (srcBuf index)
-	srcEnd int              // source end (srcBuf index)
-
-	// Source position
-	srcBufOffset int // byte offset of srcBuf[0] in source
-	line         int // line count
-	column       int // character count
-	lastLineLen  int // length of last line in characters (for correct column reporting)
-	lastCharLen  int // length of last character in bytes
-
-	// Token text buffer
-	// Typically, token text is stored completely in srcBuf, but in general
-	// the token text's head may be buffered in tokBuf while the token text's
-	// tail is stored in srcBuf.
-	tokBuf bytes.Buffer // token text head that is not in srcBuf anymore
-	tokPos int          // token text tail position (srcBuf index); valid if >= 0
-	tokEnd int          // token text tail end (srcBuf index)
-
-	// One character look-ahead
-	ch rune // character before current srcPos
-
-	// Error is called for each error encountered. If no Error
-	// function is set, the error is reported to os.Stderr.
-	Error func(s *Scanner, msg string)
-
-	// ErrorCount is incremented by one for each error encountered.
-	ErrorCount int
-
-	// The Mode field controls which tokens are recognized. For instance,
-	// to recognize Ints, set the ScanInts bit in Mode. The field may be
-	// changed at any time.
-	Mode uint
-
-	// The Whitespace field controls which characters are recognized
-	// as white space. To recognize a character ch <= ' ' as white space,
-	// set the ch'th bit in Whitespace (the Scanner's behavior is undefined
-	// for values ch > ' '). The field may be changed at any time.
-	Whitespace uint64
-
-	// Start position of most recently scanned token; set by Scan.
-	// Calling Init or Next invalidates the position (Line == 0).
-	// The Filename field is always left untouched by the Scanner.
-	// If an error is reported (via Error) and Position is invalid,
-	// the scanner is not inside a token. Call Pos to obtain an error
-	// position in that case.
-	Position
-}
-
-// Init initializes a Scanner with a new source and returns s.
-// Error is set to nil, ErrorCount is set to 0, Mode is set to GoTokens,
-// and Whitespace is set to GoWhitespace.
-func (s *Scanner) Init(src io.Reader) *Scanner {
-	s.src = src
-
-	// initialize source buffer
-	// (the first call to next() will fill it by calling src.Read)
-	s.srcBuf[0] = utf8.RuneSelf // sentinel
-	s.srcPos = 0
-	s.srcEnd = 0
-
-	// initialize source position
-	s.srcBufOffset = 0
-	s.line = 1
-	s.column = 0
-	s.lastLineLen = 0
-	s.lastCharLen = 0
-
-	// initialize token text buffer
-	// (required for first call to next()).
-	s.tokPos = -1
-
-	// initialize one character look-ahead
-	s.ch = -1 // no char read yet
-
-	// initialize public fields
-	s.Error = nil
-	s.ErrorCount = 0
-	s.Mode = GoTokens
-	s.Whitespace = GoWhitespace
-	s.Line = 0 // invalidate token position
-
-	return s
-}
-
-// next reads and returns the next Unicode character. It is designed such
-// that only a minimal amount of work needs to be done in the common ASCII
-// case (one test to check for both ASCII and end-of-buffer, and one test
-// to check for newlines).
-func (s *Scanner) next() rune {
-	ch, width := rune(s.srcBuf[s.srcPos]), 1
-
-	if ch >= utf8.RuneSelf {
-		// uncommon case: not ASCII or not enough bytes
-		for s.srcPos+utf8.UTFMax > s.srcEnd && !utf8.FullRune(s.srcBuf[s.srcPos:s.srcEnd]) {
-			// not enough bytes: read some more, but first
-			// save away token text if any
-			if s.tokPos >= 0 {
-				s.tokBuf.Write(s.srcBuf[s.tokPos:s.srcPos])
-				s.tokPos = 0
-				// s.tokEnd is set by Scan()
-			}
-			// move unread bytes to beginning of buffer
-			copy(s.srcBuf[0:], s.srcBuf[s.srcPos:s.srcEnd])
-			s.srcBufOffset += s.srcPos
-			// read more bytes
-			// (an io.Reader must return io.EOF when it reaches
-			// the end of what it is reading - simply returning
-			// n == 0 will make this loop retry forever; but the
-			// error is in the reader implementation in that case)
-			i := s.srcEnd - s.srcPos
-			n, err := s.src.Read(s.srcBuf[i:bufLen])
-			s.srcPos = 0
-			s.srcEnd = i + n
-			s.srcBuf[s.srcEnd] = utf8.RuneSelf // sentinel
-			if err != nil {
-				if s.srcEnd == 0 {
-					if s.lastCharLen > 0 {
-						// previous character was not EOF
-						s.column++
-					}
-					s.lastCharLen = 0
-					return EOF
-				}
-				if err != io.EOF {
-					s.error(err.Error())
-				}
-				// If err == EOF, we won't be getting more
-				// bytes; break to avoid infinite loop. If
-				// err is something else, we don't know if
-				// we can get more bytes; thus also break.
-				break
-			}
-		}
-		// at least one byte
-		ch = rune(s.srcBuf[s.srcPos])
-		if ch >= utf8.RuneSelf {
-			// uncommon case: not ASCII
-			ch, width = utf8.DecodeRune(s.srcBuf[s.srcPos:s.srcEnd])
-			if ch == utf8.RuneError && width == 1 {
-				// advance for correct error position
-				s.srcPos += width
-				s.lastCharLen = width
-				s.column++
-				s.error("illegal UTF-8 encoding")
-				return ch
-			}
-		}
-	}
-
-	// advance
-	s.srcPos += width
-	s.lastCharLen = width
-	s.column++
-
-	// special situations
-	switch ch {
-	case 0:
-		// for compatibility with other tools
-		s.error("illegal character NUL")
-	case '\n':
-		s.line++
-		s.lastLineLen = s.column
-		s.column = 0
-	}
-
-	return ch
-}
-
-// Next reads and returns the next Unicode character.
-// It returns EOF at the end of the source. It reports
-// a read error by calling s.Error, if not nil; otherwise
-// it prints an error message to os.Stderr. Next does not
-// update the Scanner's Position field; use Pos() to
-// get the current position.
-func (s *Scanner) Next() rune {
-	s.tokPos = -1 // don't collect token text
-	s.Line = 0    // invalidate token position
-	ch := s.Peek()
-	s.ch = s.next()
-	return ch
-}
-
-// Peek returns the next Unicode character in the source without advancing
-// the scanner. It returns EOF if the scanner's position is at the last
-// character of the source.
-func (s *Scanner) Peek() rune {
-	if s.ch < 0 {
-		// this code is only run for the very first character
-		s.ch = s.next()
-		if s.ch == '\uFEFF' {
-			s.ch = s.next() // ignore BOM
-		}
-	}
-	return s.ch
-}
-
-func (s *Scanner) error(msg string) {
-	s.ErrorCount++
-	if s.Error != nil {
-		s.Error(s, msg)
-		return
-	}
-	pos := s.Position
-	if !pos.IsValid() {
-		pos = s.Pos()
-	}
-	fmt.Fprintf(os.Stderr, "%s: %s\n", pos, msg)
-}
-
-func (s *Scanner) scanIdentifier() rune {
-	ch := s.next() // read character after first '_' or letter
-	for detectIdent(ch) {
-		ch = s.next()
-	}
-	return ch
-}
-
-func digitVal(ch rune) int {
-	switch {
-	case '0' <= ch && ch <= '9':
-		return int(ch - '0')
-	case 'a' <= ch && ch <= 'f':
-		return int(ch - 'a' + 10)
-	case 'A' <= ch && ch <= 'F':
-		return int(ch - 'A' + 10)
-	}
-	return 16 // larger than any legal digit val
-}
-
-func isDecimal(ch rune) bool { return '0' <= ch && ch <= '9' }
-
-func (s *Scanner) scanMantissa(ch rune) rune {
-	for isDecimal(ch) {
-		ch = s.next()
-	}
-	return ch
-}
-
-func (s *Scanner) scanFraction(ch rune) rune {
-	if ch == '.' {
-		ch = s.scanMantissa(s.next())
-	}
-	return ch
-}
-
-func (s *Scanner) scanExponent(ch rune) rune {
-	if ch == 'e' || ch == 'E' {
-		ch = s.next()
-		if ch == '-' || ch == '+' {
-			ch = s.next()
-		}
-		ch = s.scanMantissa(ch)
-	}
-	return ch
-}
-
-func (s *Scanner) scanNumber(ch rune) (rune, rune) {
-	// isDecimal(ch)
-	if ch == '0' {
-		// int or float
-		ch = s.next()
-		if ch == 'x' || ch == 'X' {
-			// hexadecimal int
-			ch = s.next()
-			hasMantissa := false
-			for digitVal(ch) < 16 {
-				ch = s.next()
-				hasMantissa = true
-			}
-			if !hasMantissa {
-				s.error("illegal hexadecimal number")
-			}
-		} else {
-			// octal int or float
-			has8or9 := false
-			for isDecimal(ch) {
-				if ch > '7' {
-					has8or9 = true
-				}
-				ch = s.next()
-			}
-			if s.Mode&ScanFloats != 0 && (ch == '.' || ch == 'e' || ch == 'E') {
-				// float
-				ch = s.scanFraction(ch)
-				ch = s.scanExponent(ch)
-				return Float, ch
-			}
-			// octal int
-			if has8or9 {
-				s.error("illegal octal number")
-			}
-		}
-		return Int, ch
-	}
-	// decimal int or float
-	ch = s.scanMantissa(ch)
-	if s.Mode&ScanFloats != 0 && (ch == '.' || ch == 'e' || ch == 'E') {
-		// float
-		ch = s.scanFraction(ch)
-		ch = s.scanExponent(ch)
-		return Float, ch
-	}
-	return Int, ch
-}
-
-func (s *Scanner) scanDigits(ch rune, base, n int) rune {
-	for n > 0 && digitVal(ch) < base {
-		ch = s.next()
-		n--
-	}
-	if n > 0 {
-		s.error("illegal char escape")
-	}
-	return ch
-}
-
-func (s *Scanner) scanEscape(quote rune) rune {
-	ch := s.next() // read character after '/'
-	switch ch {
-	case 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', quote:
-		// nothing to do
-		ch = s.next()
-	case '0', '1', '2', '3', '4', '5', '6', '7':
-		ch = s.scanDigits(ch, 8, 3)
-	case 'x':
-		ch = s.scanDigits(s.next(), 16, 2)
-	case 'u':
-		ch = s.scanDigits(s.next(), 16, 4)
-	case 'U':
-		ch = s.scanDigits(s.next(), 16, 8)
-	default:
-		s.error("illegal char escape")
-	}
-	return ch
-}
-
-func (s *Scanner) scanString(quote rune) (n int) {
-	ch := s.next() // read character after quote
-	for ch != quote {
-		if ch == '\n' || ch < 0 {
-			s.error("literal not terminated")
-			return
-		}
-		if ch == '\\' {
-			ch = s.scanEscape(quote)
-		} else {
-			ch = s.next()
-		}
-		n++
-	}
-	return
-}
-
-func (s *Scanner) scanRawString() {
-	ch := s.next() // read character after '`'
-	for ch != '`' {
-		if ch < 0 {
-			s.error("literal not terminated")
-			return
-		}
-		ch = s.next()
-	}
-}
-
-func (s *Scanner) scanChar() {
-	if s.scanString('\'') != 1 {
-		s.error("illegal char literal")
-	}
-}
-
-func (s *Scanner) scanComment(ch rune) rune {
-	// ch == '/' || ch == '*'
-	if ch == '/' {
-		// line comment
-		ch = s.next() // read character after "//"
-		for ch != '\n' && ch >= 0 {
-			ch = s.next()
-		}
-		return ch
-	}
-
-	// general comment
-	ch = s.next() // read character after "/*"
-	for {
-		if ch < 0 {
-			s.error("comment not terminated")
-			break
-		}
-		ch0 := ch
-		ch = s.next()
-		if ch0 == '*' && ch == '/' {
-			ch = s.next()
-			break
-		}
-	}
-	return ch
-}
-
-// Scan reads the next token or Unicode character from source and returns it.
-// It only recognizes tokens t for which the respective Mode bit (1<<-t) is set.
-// It returns EOF at the end of the source. It reports scanner errors (read and
-// token errors) by calling s.Error, if not nil; otherwise it prints an error
-// message to os.Stderr.
-func (s *Scanner) Scan() rune {
-	ch := s.Peek()
-
-	// reset token text position
-	s.tokPos = -1
-	s.Line = 0
-
-redo:
-	// skip white space
-	for s.Whitespace&(1<<uint(ch)) != 0 {
-		ch = s.next()
-	}
-
-	// start collecting token text
-	s.tokBuf.Reset()
-	s.tokPos = s.srcPos - s.lastCharLen
-
-	// set token position
-	// (this is a slightly optimized version of the code in Pos())
-	s.Offset = s.srcBufOffset + s.tokPos
-	if s.column > 0 {
-		// common case: last character was not a '\n'
-		s.Line = s.line
-		s.Column = s.column
-	} else {
-		// last character was a '\n'
-		// (we cannot be at the beginning of the source
-		// since we have called next() at least once)
-		s.Line = s.line - 1
-		s.Column = s.lastLineLen
-	}
-
-	// determine token value
-	tok := ch
-	switch {
-	case detectIdent(ch):
-		if s.Mode&ScanIdents != 0 {
-			tok = Ident
-			ch = s.scanIdentifier()
-		} else {
-			ch = s.next()
-		}
-	case isDecimal(ch):
-		if s.Mode&(ScanInts|ScanFloats) != 0 {
-			tok, ch = s.scanNumber(ch)
-		} else {
-			ch = s.next()
-		}
-	default:
-		switch ch {
-		case '"':
-			if s.Mode&ScanStrings != 0 {
-				s.scanString('"')
-				tok = String
-			}
-			ch = s.next()
-		case '\'':
-			if s.Mode&ScanChars != 0 {
-				s.scanChar()
-				tok = Char
-			}
-			ch = s.next()
-		case '.':
-			ch = s.next()
-			if isDecimal(ch) && s.Mode&ScanFloats != 0 {
-				tok = Float
-				ch = s.scanMantissa(ch)
-				ch = s.scanExponent(ch)
-			}
-		case '/':
-			ch = s.next()
-			if (ch == '/' || ch == '*') && s.Mode&ScanComments != 0 {
-				if s.Mode&SkipComments != 0 {
-					s.tokPos = -1 // don't collect token text
-					ch = s.scanComment(ch)
-					goto redo
-				}
-				ch = s.scanComment(ch)
-				tok = Comment
-			}
-		case '`':
-			if s.Mode&ScanRawStrings != 0 {
-				s.scanRawString()
-				tok = String
-			}
-			ch = s.next()
-		default:
-			ch = s.next()
-		}
-	}
-
-	// end of token text
-	s.tokEnd = s.srcPos - s.lastCharLen
-
-	s.ch = ch
-	return tok
-}
-
-// Pos returns the position of the character immediately after
-// the character or token returned by the last call to Next or Scan.
-func (s *Scanner) Pos() (pos Position) {
-	pos.Filename = s.Filename
-	pos.Offset = s.srcBufOffset + s.srcPos - s.lastCharLen
-	switch {
-	case s.column > 0:
-		// common case: last character was not a '\n'
-		pos.Line = s.line
-		pos.Column = s.column
-	case s.lastLineLen > 0:
-		// last character was a '\n'
-		pos.Line = s.line - 1
-		pos.Column = s.lastLineLen
-	default:
-		// at the beginning of the source
-		pos.Line = 1
-		pos.Column = 1
-	}
-	return
-}
-
-// TokenText returns the string corresponding to the most recently scanned token.
-// Valid after calling Scan().
-func (s *Scanner) TokenText() string {
-	if s.tokPos < 0 {
-		// no token text
-		return ""
-	}
-
-	if s.tokEnd < 0 {
-		// if EOF was reached, s.tokEnd is set to -1 (s.srcPos == 0)
-		s.tokEnd = s.tokPos
-	}
-
-	if s.tokBuf.Len() == 0 {
-		// common case: the entire token text is still in srcBuf
-		return string(s.srcBuf[s.tokPos:s.tokEnd])
-	}
-
-	// part of the token text was saved in tokBuf: save the rest in
-	// tokBuf as well and return its content
-	s.tokBuf.Write(s.srcBuf[s.tokPos:s.tokEnd])
-	s.tokPos = s.tokEnd // ensure idempotency of TokenText() call
-	return s.tokBuf.String()
-}