1 files changed, 193 insertions, 0 deletions
diff --git a/vendor/github.com/anmitsu/go-shlex/shlex.go b/vendor/github.com/anmitsu/go-shlex/shlex.go
new file mode 100644
index 0000000000..e742c38afc
--- /dev/null
+++ b/vendor/github.com/anmitsu/go-shlex/shlex.go
@@ -0,0 +1,193 @@
+// Package shlex provides a simple lexical analysis like Unix shell.
+package shlex
+
+import (
+	"bufio"
+	"errors"
+	"io"
+	"strings"
+	"unicode"
+)
+
+var (
+	ErrNoClosing = errors.New("No closing quotation")
+	ErrNoEscaped = errors.New("No escaped character")
+)
+
+// Tokenizer is the interface that classifies a token according to
+// words, whitespaces, quotations, escapes and escaped quotations.
+type Tokenizer interface {
+	IsWord(rune) bool
+	IsWhitespace(rune) bool
+	IsQuote(rune) bool
+	IsEscape(rune) bool
+	IsEscapedQuote(rune) bool
+}
+
+// DefaultTokenizer implements a simple tokenizer like Unix shell.
+type DefaultTokenizer struct{}
+
+func (t *DefaultTokenizer) IsWord(r rune) bool {
+	return r == '_' || unicode.IsLetter(r) || unicode.IsNumber(r)
+}
+func (t *DefaultTokenizer) IsQuote(r rune) bool {
+	switch r {
+	case '\'', '"':
+		return true
+	default:
+		return false
+	}
+}
+func (t *DefaultTokenizer) IsWhitespace(r rune) bool {
+	return unicode.IsSpace(r)
+}
+func (t *DefaultTokenizer) IsEscape(r rune) bool {
+	return r == '\\'
+}
+func (t *DefaultTokenizer) IsEscapedQuote(r rune) bool {
+	return r == '"'
+}
+
+// Lexer represents a lexical analyzer.
+type Lexer struct {
+	reader          *bufio.Reader
+	tokenizer       Tokenizer
+	posix           bool
+	whitespacesplit bool
+}
+
+// NewLexer creates a new Lexer reading from io.Reader.  This Lexer
+// has a DefaultTokenizer according to posix and whitespacesplit
+// rules.
+func NewLexer(r io.Reader, posix, whitespacesplit bool) *Lexer {
+	return &Lexer{
+		reader:          bufio.NewReader(r),
+		tokenizer:       &DefaultTokenizer{},
+		posix:           posix,
+		whitespacesplit: whitespacesplit,
+	}
+}
+
+// NewLexerString creates a new Lexer reading from a string.  This
+// Lexer has a DefaultTokenizer according to posix and whitespacesplit
+// rules.
+func NewLexerString(s string, posix, whitespacesplit bool) *Lexer {
+	return NewLexer(strings.NewReader(s), posix, whitespacesplit)
+}
+
+// Split splits a string according to posix or non-posix rules.
+func Split(s string, posix bool) ([]string, error) {
+	return NewLexerString(s, posix, true).Split()
+}
+
+// SetTokenizer sets a Tokenizer.
+func (l *Lexer) SetTokenizer(t Tokenizer) {
+	l.tokenizer = t
+}
+
+func (l *Lexer) Split() ([]string, error) {
+	result := make([]string, 0)
+	for {
+		token, err := l.readToken()
+		if token != "" {
+			result = append(result, token)
+		}
+
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return result, err
+		}
+	}
+	return result, nil
+}
+
+func (l *Lexer) readToken() (string, error) {
+	t := l.tokenizer
+	token := ""
+	quoted := false
+	state := ' '
+	escapedstate := ' '
+scanning:
+	for {
+		next, _, err := l.reader.ReadRune()
+		if err != nil {
+			if t.IsQuote(state) {
+				return token, ErrNoClosing
+			} else if t.IsEscape(state) {
+				return token, ErrNoEscaped
+			}
+			return token, err
+		}
+
+		switch {
+		case t.IsWhitespace(state):
+			switch {
+			case t.IsWhitespace(next):
+				break scanning
+			case l.posix && t.IsEscape(next):
+				escapedstate = 'a'
+				state = next
+			case t.IsWord(next):
+				token += string(next)
+				state = 'a'
+			case t.IsQuote(next):
+				if !l.posix {
+					token += string(next)
+				}
+				state = next
+			default:
+				token = string(next)
+				if l.whitespacesplit {
+					state = 'a'
+				} else if token != "" || (l.posix && quoted) {
+					break scanning
+				}
+			}
+		case t.IsQuote(state):
+			quoted = true
+			switch {
+			case next == state:
+				if !l.posix {
+					token += string(next)
+					break scanning
+				} else {
+					state = 'a'
+				}
+			case l.posix && t.IsEscape(next) && t.IsEscapedQuote(state):
+				escapedstate = state
+				state = next
+			default:
+				token += string(next)
+			}
+		case t.IsEscape(state):
+			if t.IsQuote(escapedstate) && next != state && next != escapedstate {
+				token += string(state)
+			}
+			token += string(next)
+			state = escapedstate
+		case t.IsWord(state):
+			switch {
+			case t.IsWhitespace(next):
+				if token != "" || (l.posix && quoted) {
+					break scanning
+				}
+			case l.posix && t.IsQuote(next):
+				state = next
+			case l.posix && t.IsEscape(next):
+				escapedstate = 'a'
+				state = next
+			case t.IsWord(next) || t.IsQuote(next):
+				token += string(next)
+			default:
+				if l.whitespacesplit {
+					token += string(next)
+				} else if token != "" {
+					l.reader.UnreadRune()
+					break scanning
+				}
+			}
+		}
+	}
+	return token, nil
+}