// Copyright 2010 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.

// General environment variables.

package os

import "syscall"

// Expand replaces ${var} or $var in the string based on the mapping function.
// For example, os.ExpandEnv(s) is equivalent to os.Expand(s, os.Getenv).
func Expand(s string, mapping func(string) string) string {
	buf := make([]byte, 0, 2*len(s))
	// ${} is all ASCII, so bytes are fine for this operation.
	i := 0
	for j := 0; j < len(s); j++ {
		if s[j] == '$' && j+1 < len(s) {
			buf = append(buf, s[i:j]...)
			name, w := getShellName(s[j+1:])
			buf = append(buf, mapping(name)...)
			j += w
			i = j + 1
		}
	}
	return string(buf) + s[i:]
}

// ExpandEnv replaces ${var} or $var in the string according to the values
// of the current environment variables.  References to undefined
// variables are replaced by the empty string.
func ExpandEnv(s string) string {
	return Expand(s, Getenv)
}

// isSpellSpecialVar reports whether the character identifies a special
// shell variable such as $*.
func isShellSpecialVar(c uint8) bool {
	switch c {
	case '*', '#', '$', '@', '!', '?', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		return true
	}
	return false
}

// isAlphaNum reports whether the byte is an ASCII letter, number, or underscore
func isAlphaNum(c uint8) bool {
	return c == '_' || '0' <= c && c <= '9' || 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z'
}

// getName returns the name that begins the string and the number of bytes
// consumed to extract it.  If the name is enclosed in {}, it's part of a ${}
// expansion and two more bytes are needed than the length of the name.
func getShellName(s string) (string, int) {
	switch {
	case s[0] == '{':
		if len(s) > 2 && isShellSpecialVar(s[1]) && s[2] == '}' {
			return s[1:2], 3
		}
		// Scan to closing brace
		for i := 1; i < len(s); i++ {
			if s[i] == '}' {
				return s[1:i], i + 1
			}
		}
		return "", 1 // Bad syntax; just eat the brace.
	case isShellSpecialVar(s[0]):
		return s[0:1], 1
	}
	// Scan alphanumerics.
	var i int
	for i = 0; i < len(s) && isAlphaNum(s[i]); i++ {
	}
	return s[:i], i
}

// Getenv retrieves the value of the environment variable named by the key.
// It returns the value, which will be empty if the variable is not present.
func Getenv(key string) string {
	v, _ := syscall.Getenv(key)
	return v
}

// Setenv sets the value of the environment variable named by the key.
// It returns an error, if any.
func Setenv(key, value string) error {
	err := syscall.Setenv(key, value)
	if err != nil {
		return NewSyscallError("setenv", err)
	}
	return nil
}

// Clearenv deletes all environment variables.
func Clearenv() {
	syscall.Clearenv()
}

// Environ returns a copy of strings representing the environment,
// in the form "key=value".
func Environ() []string {
	return syscall.Environ()
}
