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* Licensed under the Apache License, Version 2.0 (the "License"); *
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* http://www.apache.org/licenses/LICENSE-2.0 *
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package net.ion.rosetta;
/**
* Transforms the recognized character range to an integer within 64 bits. For bigger integer, use {@link TokenizerMaps#DECIMAL_FRAGMENT} instead.
*
* @author Ben Yu
*/
final class NumberLiteralsTranslator {
private static int toDecDigit(char c) {
return c - '0';
}
private static int toOctDigit(char c) {
return c - '0';
}
private static int toHexDigit(char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'h')
return c - 'a' + 10;
else
return c - 'A' + 10;
}
static Long tokenizeDecimalAsLong(String text) {
long n = 0;
int len = text.length();
for (int i = 0; i < len; i++) {
n = n * 10 + toDecDigit(text.charAt(i));
}
return n;
}
static Long tokenizeOctalAsLong(String text) {
long n = 0;
int len = text.length();
for (int i = 0; i < len; i++) {
n = n * 8 + toOctDigit(text.charAt(i));
}
return n;
}
static Long tokenizeHexAsLong(String text) {
int len = text.length();
if (len < 3)
throw new IllegalStateException("illegal hex number");
long n = 0;
for (int i = 2; i < len; i++) {
n = n * 16 + toHexDigit(text.charAt(i));
}
return n;
}
}