137 lines
3.3 KiB
Go
137 lines
3.3 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package runner
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import (
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"errors"
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"runtime"
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"unicode"
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"github.com/flynn/go-shlex"
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)
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const (
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osWindows = "windows"
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osLinux = "linux"
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)
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var runtimeGoos = runtime.GOOS
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// SplitCommandAndArgs takes a command string and parses it shell-style into the
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// command and its separate arguments.
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func SplitCommandAndArgs(command string) (cmd string, args []string, err error) {
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var parts []string
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if runtimeGoos == osWindows {
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parts = parseWindowsCommand(command) // parse it Windows-style
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} else {
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parts, err = parseUnixCommand(command) // parse it Unix-style
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if err != nil {
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err = errors.New("error parsing command: " + err.Error())
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return
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}
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}
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if len(parts) == 0 {
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err = errors.New("no command contained in '" + command + "'")
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return
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}
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cmd = parts[0]
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if len(parts) > 1 {
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args = parts[1:]
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}
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return
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}
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// parseUnixCommand parses a unix style command line and returns the
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// command and its arguments or an error
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func parseUnixCommand(cmd string) ([]string, error) {
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return shlex.Split(cmd)
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}
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// parseWindowsCommand parses windows command lines and
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// returns the command and the arguments as an array. It
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// should be able to parse commonly used command lines.
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// Only basic syntax is supported:
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// - spaces in double quotes are not token delimiters
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// - double quotes are escaped by either backspace or another double quote
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// - except for the above case backspaces are path separators (not special)
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//
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// Many sources point out that escaping quotes using backslash can be unsafe.
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// Use two double quotes when possible. (Source: http://stackoverflow.com/a/31413730/2616179 )
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//
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// This function has to be used on Windows instead
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// of the shlex package because this function treats backslash
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// characters properly.
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func parseWindowsCommand(cmd string) []string {
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const backslash = '\\'
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const quote = '"'
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var parts []string
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var part string
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var inQuotes bool
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var lastRune rune
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for i, ch := range cmd {
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if i != 0 {
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lastRune = rune(cmd[i-1])
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}
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if ch == backslash {
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// put it in the part - for now we don't know if it's an
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// escaping char or path separator
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part += string(ch)
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continue
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}
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if ch == quote {
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if lastRune == backslash {
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// remove the backslash from the part and add the escaped quote instead
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part = part[:len(part)-1]
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part += string(ch)
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continue
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}
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if lastRune == quote {
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// revert the last change of the inQuotes state
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// it was an escaping quote
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inQuotes = !inQuotes
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part += string(ch)
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continue
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}
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// normal escaping quotes
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inQuotes = !inQuotes
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continue
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}
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if unicode.IsSpace(ch) && !inQuotes && part != "" {
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parts = append(parts, part)
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part = ""
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continue
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}
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part += string(ch)
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}
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if part != "" {
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parts = append(parts, part)
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}
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return parts
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}
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