Module io.github.mmm.scanner

Package io.github.mmm.scanner.number

Interface CharScannerRadixHandler

All Known Subinterfaces:

CharScannerNumberParser

All Known Implementing Classes:

CharScannerNumberParserBase, CharScannerNumberParserLang, CharScannerNumberParserString, CharScannerRadixMode

public interface CharScannerRadixHandler

Interface for radix handling.

Method Summary

Modifier and Type	Method	Description
int	radix(int radix, char symbol)	This method will be called if the first character is '0' and will also pass a lookahead of the next character as parameter symbol.

Method Details

radix

int radix(int radix,
 char symbol)

This method will be called if the first character is '0' and will also pass a lookahead of the next character as parameter symbol.

Parameters:

radix - the radix. Will be 16 for "0x", 2 for "0b", 8 for "0" followed by an octal digit (0-7), and 0 in case an unexpected character was found after the first zero.

symbol - the character followed by the leading zero. E.g. 'x' or 'X' for radix 16. You could even implement custom radix mode like "0o" for octal instead of "0" by returning 8 if symbol is 'o' or 'O'.

Returns:

the actual radix to use for further processing. If 0 (or less) is returned the radix is not accepted and "0" is treated as a leading zero rather than a prefix of the radix that will remain to be 10. Typically implementations will return the given radix, but to prevent octal parsing due to a leading zero (Java/C legacy) you can return 10 if 8 was given. If 8 is returned, the symbol will be consumed and skipped if it is not a digit while otherwise the digit will be consumed as part of the number even if it is greater than 7 (finally leading to a NumberFormatException).