| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.BigDecimal; |
| import java.math.BigInteger; |
| |
| /** |
| * Helper class for processing Groovy numeric literals. |
| */ |
| 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) { |
| String text1 = text; |
| // remove place holder underscore before starting |
| text1 = text1.replace("_", ""); |
| |
| char c = ' '; |
| int length = text1.length(); |
| |
| // |
| // Strip off the sign, if present |
| |
| boolean negative = false; |
| if ((c = text1.charAt(0)) == '-' || c == '+') { |
| negative = (c == '-'); |
| text1 = text1.substring(1, length); |
| length -= 1; |
| } |
| |
| // |
| // Determine radix (default is 10). |
| |
| int radix = 10; |
| if (text1.charAt(0) == '0' && length > 1) { |
| c = text1.charAt(1); |
| if (c == 'X' || c == 'x') { |
| radix = 16; |
| text1 = text1.substring(2, length); |
| length -= 2; |
| } else if (c == 'B' || c == 'b') { |
| radix = 2; |
| text1 = text1.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(text1.charAt(length - 1), false)) { |
| type = Character.toLowerCase(text1.charAt(length - 1)); |
| text1 = text1.substring(0, length - 1); |
| |
| length -= 1; |
| } |
| |
| // |
| // Add the sign back, if necessary |
| |
| if (negative) { |
| text1 = "-" + text1; |
| } |
| |
| // |
| // Build the specified type or, if no type was specified, the |
| // smallest type in which the number will fit. |
| |
| BigInteger value = new BigInteger(text1, radix); |
| |
| switch (type) { |
| case 'i': |
| if (radix == 10 && (value.compareTo(MAX_INTEGER) > 0 || value.compareTo(MIN_INTEGER) < 0)) { |
| throw new NumberFormatException("Number of value " + value + " does not fit in the range of int, but int was enforced."); |
| } else { |
| return value.intValue(); |
| } |
| case 'l': |
| if (radix == 10 && (value.compareTo(MAX_LONG) > 0 || value.compareTo(MIN_LONG) < 0)) { |
| throw new NumberFormatException("Number of value " + value + " does not fit in the range of long, but long was enforced."); |
| } else { |
| return value.longValue(); |
| } |
| case 'g': |
| return value; |
| default: |
| // If not specified, we will return the narrowest possible |
| // of Integer, Long, and BigInteger. |
| if (value.compareTo(MAX_INTEGER) <= 0 && value.compareTo(MIN_INTEGER) >= 0) { |
| return value.intValue(); |
| } else if (value.compareTo(MAX_LONG) <= 0 && value.compareTo(MIN_LONG) >= 0) { |
| return 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) { |
| text = text.replace("_", ""); |
| 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); |
| } |
| |
| // |
| // 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 Float.parseFloat(text); |
| } |
| throw new NumberFormatException("out of range"); |
| |
| case 'd': |
| if (value.compareTo(MAX_DOUBLE) <= 0 && value.compareTo(MIN_DOUBLE) >= 0) { |
| return Double.parseDouble(text); |
| } |
| throw new NumberFormatException("out of range"); |
| |
| case 'g': |
| default: |
| return value; |
| } |
| } |
| |
| } |