de.unkrig.commons.text.scanner

Class ScannerUtil

java.lang.Object

de.unkrig.commons.text.scanner.ScannerUtil

public final class ScannerUtil
extends Object

Various scanner-related utility methods.

Field Summary

Fields

Modifier and Type	Field and Description
static int	UNESCAPE_DOUBLE_QUOTE If set, \" escapes to a double quote, otherwise it is an invalid escape sequence.
static int	UNESCAPE_NUL If set, "\023" escapes to '\0', '2', '3', otherwise, if 16, it escapes to '#', otherwise, it is an invalid escape sequence.
static int	UNESCAPE_OCTAL If set, "\123" escapes to "S", otherwise it is an invalid escape sequence (but see UNESCAPE_NUL).
static int	UNESCAPE_SINGLE_QUOTE If set, \' escapes to a single quote, otherwise it is an invalid escape sequence.
static int	UNESCAPE_UNICODE If set, "\uxxxx" escapes to the unicode character 'xxxx', otherwise it is an invalid escape sequence.

Method Summary

Modifier and Type	Method and Description
static <T,EX extends Throwable> ProducerWhichThrows<T,EX>	augmentScanningLocation(ProducerWhichThrows<? extends T,? extends EX> delegate, String prefix)
static <TT extends Enum<TT>> StringScanner<TT>	filter(StringScanner<TT> delegate, Predicate<? super AbstractScanner.Token<TT>> predicate)
static <TT extends Enum<TT>> ProducerWhichThrows<AbstractScanner.Token<TT>,ScanException>	scanner(StringScanner<TT> stringScanner, File file, Charset charset) Uses a given StringScanner to scan the contents of a given file.
static <TT extends Enum<TT>> DocumentScanner<TT>	toDocumentScanner(StringScanner<TT> stringScanner, Reader reader) Converts the StringScanner, which reads from a CharSequence into a DocumentScanner, which reads from a Reader and thinks in "line numbers" and "column numbers").
static String	unescape(String s, int options)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UNESCAPE_NUL

public static final int UNESCAPE_NUL

If set, "\023" escapes to '\0', '2', '3', otherwise, if 16, it escapes to '#', otherwise, it is an invalid escape sequence.

See Also:

unescape(String, int), Constant Field Values

UNESCAPE_DOUBLE_QUOTE

public static final int UNESCAPE_DOUBLE_QUOTE

If set, \" escapes to a double quote, otherwise it is an invalid escape sequence.

See Also:

unescape(String, int), Constant Field Values

UNESCAPE_SINGLE_QUOTE

public static final int UNESCAPE_SINGLE_QUOTE

If set, \' escapes to a single quote, otherwise it is an invalid escape sequence.

See Also:

unescape(String, int), Constant Field Values

UNESCAPE_UNICODE

public static final int UNESCAPE_UNICODE

If set, "\uxxxx" escapes to the unicode character 'xxxx', otherwise it is an invalid escape sequence.

See Also:

unescape(String, int), Constant Field Values

UNESCAPE_OCTAL

public static final int UNESCAPE_OCTAL

If set, "\123" escapes to "S", otherwise it is an invalid escape sequence (but see UNESCAPE_NUL).

See Also:

unescape(String, int), Constant Field Values

Method Detail

toDocumentScanner

public static <TT extends Enum<TT>> DocumentScanner<TT> toDocumentScanner(StringScanner<TT> stringScanner,
                                                                          Reader reader)

Converts the StringScanner, which reads from a CharSequence into a DocumentScanner, which reads from a Reader and thinks in "line numbers" and "column numbers").

IOExceptions thrown by the Reader are wrapped in ScanExceptions.

scanner

public static <TT extends Enum<TT>> ProducerWhichThrows<AbstractScanner.Token<TT>,ScanException> scanner(StringScanner<TT> stringScanner,
                                                                                                         File file,
                                                                                                         Charset charset)
                                                                                                  throws FileNotFoundException

Uses a given StringScanner to scan the contents of a given file.

Parameters:

charset - E.g. Charset.forName(String) or Charset.defaultCharset()

Throws:

FileNotFoundException

See Also:

toDocumentScanner(StringScanner, Reader)

augmentScanningLocation

public static <T,EX extends Throwable> ProducerWhichThrows<T,EX> augmentScanningLocation(ProducerWhichThrows<? extends T,? extends EX> delegate,
                                                                                         @Nullable
                                                                                         String prefix)

Returns:

A Producer who's Object.toString() method prepends the given prefix, a colon and a space to the string returned by the delegate's Object.toString() method

filter

public static <TT extends Enum<TT>> StringScanner<TT> filter(StringScanner<TT> delegate,
                                                             Predicate<? super AbstractScanner.Token<TT>> predicate)

Returns:

A StringScanner which produces tokens through a delegate, but only those for which the predicate returns true

unescape

public static String unescape(String s,
                              int options)
                       throws ScanException

Returns:

The input string, unescaped according to the rules defined in JLS7

Throws:

ScanException - s contains control characters

ScanException - \\ is not followed by exactly four hex digits

ScanException - A backslash is not followed by an allowed character

ScanException - s ends in the middle of an escape sequence

See Also:

UNESCAPE_NUL, UNESCAPE_DOUBLE_QUOTE, UNESCAPE_SINGLE_QUOTE, UNESCAPE_UNICODE, UNESCAPE_OCTAL