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StringUtil.php
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StringUtil.php
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<?php
declare(strict_types=1);
namespace Phan\Library;
use Phan\AST\ASTReverter;
/**
* StringUtil contains methods to simplify working with strings in Phan and its plugins.
*/
class StringUtil
{
/**
* Encode a scalar value in a compact, unambiguous representation for emitted issues.
* The encoder used by encodeValue may change.
* This aims to fit on a single line.
*
* @param string|int|float|bool|null $value
*/
public static function encodeValue($value): string
{
if (\is_string($value) && \preg_match('/([\0-\15\16-\37])/', $value)) {
// Use double quoted strings if this contains newlines, tabs, control characters, etc.
return '"' . ASTReverter::escapeInnerString($value, '"') . '"';
}
return self::varExportPretty($value);
}
/**
* Encode a scalar value in a compact, unambiguous representation for emitted issues.
* The encoder used by encodeValue may change.
* This fits on a single line.
*
* @param ?(int|bool|string|array|float) $value
*/
public static function varExportPretty($value): string
{
return \var_representation($value, \VAR_REPRESENTATION_SINGLE_LINE);
}
/**
* JSON encodes a value - Guaranteed to return a string.
* @param string|int|float|bool|null|array|object $value
*/
public static function jsonEncode($value): string
{
$result = \json_encode($value, \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE | \JSON_PARTIAL_OUTPUT_ON_ERROR);
return \is_string($result) ? $result : '(invalid data)';
}
/**
* Encode a list of values in a compact, unambiguous representation for emitted issues.
* @param list<string|int|float|bool> $values
*/
public static function encodeValueList(string $separator, array $values): string
{
return \implode(
$separator,
\array_map([self::class, 'encodeValue'], $values)
);
}
/**
* Coerce $str to valid utf-8
*/
public static function asUtf8(string $str): string
{
return \mb_convert_encoding($str, 'UTF-8', 'UTF-8') ?: $str;
}
/**
* Coerce $str to valid utf-8 and replace newlines with placeholders
*/
public static function asSingleLineUtf8(string $str): string
{
if (!\preg_match("@[\\n\\r\x80-\xff]@", $str)) {
// Around 5x faster for the common case of being ASCII without newlines.
return $str;
}
return \str_replace(["\n", "\r"], "�", self::asUtf8($str));
}
/**
* Returns true if the provided argument is a non-zero length string.
* Unlike (bool)$str, this allows the literal string '0', and rejects types other than strings.
*
* @param ?string|?false $str typical inputs are nullable/falsable strings
* @phan-assert string $str TODO: This unconditionally sets the type of $str to string - add an equivalent that only sets the type when true.
* @psalm-assert-if-true string $str
*/
public static function isNonZeroLengthString($str): bool
{
return \is_string($str) && $str !== '';
}
}

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StringUtil.php (3 KB)

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