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<?php
namespace Dotenv;
use Dotenv\Exception\InvalidFileException;
use Dotenv\Regex\Regex;
class Parser
{
const INITIAL_STATE = 0;
const UNQUOTED_STATE = 1;
const QUOTED_STATE = 2;
const ESCAPE_STATE = 3;
const WHITESPACE_STATE = 4;
const COMMENT_STATE = 5;
/**
* Parse the given environment variable entry into a name and value.
*
* @param string $entry
*
* @throws \Dotenv\Exception\InvalidFileException
*
* @return array
*/
public static function parse($entry)
{
list($name, $value) = self::splitStringIntoParts($entry);
return [self::parseName($name), self::parseValue($value)];
}
/**
* Split the compound string into parts.
*
* @param string $line
*
* @throws \Dotenv\Exception\InvalidFileException
*
* @return array
*/
private static function splitStringIntoParts($line)
{
$name = $line;
$value = null;
if (strpos($line, '=') !== false) {
list($name, $value) = array_map('trim', explode('=', $line, 2));
}
if ($name === '') {
throw new InvalidFileException(
self::getErrorMessage('an unexpected equals', $line)
);
}
return [$name, $value];
}
/**
* Strips quotes and the optional leading "export " from the variable name.
*
* @param string $name
*
* @throws \Dotenv\Exception\InvalidFileException
*
* @return string
*/
private static function parseName($name)
{
$name = trim(str_replace(['export ', '\'', '"'], '', $name));
if (!self::isValidName($name)) {
throw new InvalidFileException(
self::getErrorMessage('an invalid name', $name)
);
}
return $name;
}
/**
* Is the given variable name valid?
*
* @param string $name
*
* @return bool
*/
private static function isValidName($name)
{
return Regex::match('~\A[a-zA-Z0-9_.]+\z~', $name)->success()->getOrElse(0) === 1;
}
/**
* Strips quotes and comments from the environment variable value.
*
* @param string|null $value
*
* @throws \Dotenv\Exception\InvalidFileException
*
* @return string|null
*/
private static function parseValue($value)
{
if ($value === null || trim($value) === '') {
return $value;
}
return array_reduce(str_split($value), function ($data, $char) use ($value) {
switch ($data[1]) {
case self::INITIAL_STATE:
if ($char === '"' || $char === '\'') {
return [$data[0], self::QUOTED_STATE];
} elseif ($char === '#') {
return [$data[0], self::COMMENT_STATE];
} else {
return [$data[0].$char, self::UNQUOTED_STATE];
}
case self::UNQUOTED_STATE:
if ($char === '#') {
return [$data[0], self::COMMENT_STATE];
} elseif (ctype_space($char)) {
return [$data[0], self::WHITESPACE_STATE];
} else {
return [$data[0].$char, self::UNQUOTED_STATE];
}
case self::QUOTED_STATE:
if ($char === $value[0]) {
return [$data[0], self::WHITESPACE_STATE];
} elseif ($char === '\\') {
return [$data[0], self::ESCAPE_STATE];
} else {
return [$data[0].$char, self::QUOTED_STATE];
}
case self::ESCAPE_STATE:
if ($char === $value[0] || $char === '\\') {
return [$data[0].$char, self::QUOTED_STATE];
} elseif (in_array($char, ['f', 'n', 'r', 't', 'v'], true)) {
return [$data[0].stripcslashes('\\'.$char), self::QUOTED_STATE];
} else {
throw new InvalidFileException(
self::getErrorMessage('an unexpected escape sequence', $value)
);
}
case self::WHITESPACE_STATE:
if ($char === '#') {
return [$data[0], self::COMMENT_STATE];
} elseif (!ctype_space($char)) {
throw new InvalidFileException(
self::getErrorMessage('unexpected whitespace', $value)
);
} else {
return [$data[0], self::WHITESPACE_STATE];
}
case self::COMMENT_STATE:
return [$data[0], self::COMMENT_STATE];
}
}, ['', self::INITIAL_STATE])[0];
}
/**
* Generate a friendly error message.
*
* @param string $cause
* @param string $subject
*
* @return string
*/
private static function getErrorMessage($cause, $subject)
{
return sprintf(
'Failed to parse dotenv file due to %s. Failed at [%s].',
$cause,
strtok($subject, "\n")
);
}
}