| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.codehaus.groovy.syntax; |
| |
| import java.math.BigInteger; |
| import java.math.BigDecimal; |
| |
| /** |
| * Helper class for processing Groovy numeric literals. |
| * |
| * @author Brian Larson |
| * @author <a href="mailto:cpoirier@dreaming.org">Chris Poirier</a> |
| * |
| * @version $Id$ |
| */ |
| |
| public class Numbers |
| { |
| |
| |
| |
| //--------------------------------------------------------------------------- |
| // LEXING SUPPORT |
| |
| |
| /** |
| * Returns true if the specified character is a base-10 digit. |
| */ |
| |
| public static boolean isDigit( char c ) |
| { |
| return c >= '0' && c <= '9'; |
| } |
| |
| |
| /** |
| * Returns true if the specific character is a base-8 digit. |
| */ |
| |
| public static boolean isOctalDigit( char c ) |
| { |
| return c >= '0' && c <= '7'; |
| } |
| |
| |
| /** |
| * Returns true if the specified character is a base-16 digit. |
| */ |
| |
| public static boolean isHexDigit( char c ) |
| { |
| return isDigit(c) || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'); |
| } |
| |
| |
| |
| /** |
| * Returns true if the specified character is a valid type specifier |
| * for a numeric value. |
| */ |
| |
| public static boolean isNumericTypeSpecifier( char c, boolean isDecimal ) |
| { |
| if( isDecimal ) |
| { |
| switch( c ) |
| { |
| case 'G': |
| case 'g': |
| case 'D': |
| case 'd': |
| case 'F': |
| case 'f': |
| return true; |
| } |
| } |
| else |
| { |
| switch( c ) |
| { |
| case 'G': |
| case 'g': |
| case 'I': |
| case 'i': |
| case 'L': |
| case 'l': |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| |
| |
| |
| |
| //--------------------------------------------------------------------------- |
| // PARSING SUPPORT |
| |
| |
| private static final BigInteger MAX_LONG = BigInteger.valueOf(Long.MAX_VALUE); |
| private static final BigInteger MIN_LONG = BigInteger.valueOf(Long.MIN_VALUE); |
| |
| private static final BigInteger MAX_INTEGER = BigInteger.valueOf(Integer.MAX_VALUE); |
| private static final BigInteger MIN_INTEGER = BigInteger.valueOf(Integer.MIN_VALUE); |
| |
| private static final BigDecimal MAX_DOUBLE = new BigDecimal(String.valueOf(Double.MAX_VALUE)); |
| private static final BigDecimal MIN_DOUBLE = MAX_DOUBLE.negate(); |
| |
| private static final BigDecimal MAX_FLOAT = new BigDecimal(String.valueOf(Float.MAX_VALUE)); |
| private static final BigDecimal MIN_FLOAT = MAX_FLOAT.negate(); |
| |
| |
| |
| /** |
| * Builds a Number from the given integer descriptor. Creates the narrowest |
| * type possible, or a specific type, if specified. |
| * |
| * @param text literal text to parse |
| * @return instantiated Number object |
| * @throws NumberFormatException if the number does not fit within the type |
| * requested by the type specifier suffix (invalid numbers don't make |
| * it here) |
| */ |
| |
| public static Number parseInteger( String text ) |
| { |
| char c = ' '; |
| int length = text.length(); |
| |
| |
| // |
| // Strip off the sign, if present |
| |
| boolean negative = false; |
| if( (c = text.charAt(0)) == '-' || c == '+' ) |
| { |
| negative = (c == '-'); |
| text = text.substring( 1, length ); |
| length -= 1; |
| } |
| |
| |
| // |
| // Determine radix (default is 10). |
| |
| int radix = 10; |
| if( text.charAt(0) == '0' && length > 1 ) |
| { |
| if( (c = text.charAt(1)) == 'X' || c == 'x' ) |
| { |
| radix = 16; |
| text = text.substring( 2, length); |
| length -= 2; |
| } |
| else |
| { |
| radix = 8; |
| } |
| } |
| |
| |
| // |
| // Strip off any type specifier and convert it to lower |
| // case, if present. |
| |
| char type = 'x'; // pick best fit |
| if( isNumericTypeSpecifier(text.charAt(length-1), false) ) |
| { |
| type = Character.toLowerCase( text.charAt(length-1) ); |
| text = text.substring( 0, length-1); |
| |
| length -= 1; |
| } |
| |
| |
| // |
| // Add the sign back, if necessary |
| |
| if( negative ) |
| { |
| text = "-" + text; |
| } |
| |
| |
| // |
| // Build the specified type or, if no type was specified, the |
| // smallest type in which the number will fit. |
| |
| switch (type) |
| { |
| case 'i': |
| return new Integer( Integer.parseInt(text, radix) ); |
| |
| case 'l': |
| return new Long( Long.parseLong(text, radix) ); |
| |
| case 'g': |
| return new BigInteger( text, radix ); |
| |
| default: |
| |
| // |
| // If not specified, we will return the narrowest possible |
| // of Integer, Long, and BigInteger. |
| |
| BigInteger value = new BigInteger( text, radix ); |
| |
| if( value.compareTo(MAX_INTEGER) <= 0 && value.compareTo(MIN_INTEGER) >= 0 ) |
| { |
| return new Integer(value.intValue()); |
| } |
| else if( value.compareTo(MAX_LONG) <= 0 && value.compareTo(MIN_LONG) >= 0 ) |
| { |
| return new Long(value.longValue()); |
| } |
| |
| return value; |
| } |
| } |
| |
| |
| |
| /** |
| * Builds a Number from the given decimal descriptor. Uses BigDecimal, |
| * unless, Double or Float is requested. |
| * |
| * @param text literal text to parse |
| * @return instantiated Number object |
| * @throws NumberFormatException if the number does not fit within the type |
| * requested by the type specifier suffix (invalid numbers don't make |
| * it here) |
| */ |
| |
| public static Number parseDecimal( String text ) |
| { |
| int length = text.length(); |
| |
| |
| // |
| // Strip off any type specifier and convert it to lower |
| // case, if present. |
| |
| char type = 'x'; |
| if( isNumericTypeSpecifier(text.charAt(length-1), true) ) |
| { |
| type = Character.toLowerCase( text.charAt(length-1) ); |
| text = text.substring( 0, length-1 ); |
| |
| length -= 1; |
| } |
| |
| |
| // |
| // Build the specified type or default to BigDecimal |
| |
| BigDecimal value = new BigDecimal( text ); |
| switch( type ) |
| { |
| case 'f': |
| if( value.compareTo(MAX_FLOAT) <= 0 && value.compareTo(MIN_FLOAT) >= 0) |
| { |
| return new Float( text ); |
| } |
| throw new NumberFormatException( "out of range" ); |
| |
| case 'd': |
| if( value.compareTo(MAX_DOUBLE) <= 0 && value.compareTo(MIN_DOUBLE) >= 0) |
| { |
| return new Double( text ); |
| } |
| throw new NumberFormatException( "out of range" ); |
| |
| case 'g': |
| default: |
| return value; |
| } |
| } |
| |
| } |