1 package net.mograsim.plugin.asm;
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3 import static java.lang.String.format;
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5 import java.math.BigInteger;
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6 import java.util.regex.Pattern;
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8 public final class AsmNumberUtil
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11 private AsmNumberUtil()
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16 private static final String sgnPat = "([-+]?)";
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17 private static final String binPat = "((?:[01]+_)*[01]+)";
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18 private static final String octPat = "((?:[0-7]+_)*[0-7]+)";
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19 private static final String decPat = "((?:[0-9]+_)*[0-9]+)";
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20 private static final String hexPat = "((?:[0-9a-f]+_)*[0-9a-f]+)";
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21 static final Pattern numberBin = Pattern.compile(format("%1$s0b%2$s|%1$s%2$sb", sgnPat, binPat), Pattern.CASE_INSENSITIVE);
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22 static final Pattern numberOct = Pattern.compile(format("%s%sq", sgnPat, octPat), Pattern.CASE_INSENSITIVE);
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23 static final Pattern numberDec = Pattern.compile(format("%s%s", sgnPat, decPat));
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24 static final Pattern numberHex = Pattern.compile(format("%1$s0x%2$s|%1$s%2$sh", sgnPat, hexPat), Pattern.CASE_INSENSITIVE);
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25 static final Pattern numberFloat = Pattern.compile(format("%1$s%2$s(?:\\.%2$s)?(?:e%1$s%2$s)?", sgnPat, decPat),
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26 Pattern.CASE_INSENSITIVE);
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28 public static boolean isBinary(CharSequence cs)
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30 return numberBin.matcher(cs).matches();
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33 public static boolean isOctal(CharSequence cs)
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35 return numberOct.matcher(cs).matches();
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38 public static boolean isDecimal(CharSequence cs)
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40 return numberDec.matcher(cs).matches();
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43 public static boolean isHexadecimal(CharSequence cs)
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45 return numberHex.matcher(cs).matches();
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48 public static boolean isFloatingPoint(CharSequence cs)
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50 return numberFloat.matcher(cs).matches();
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53 public static boolean isNumber(CharSequence cs)
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55 return getType(cs) != NumberType.NONE;
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58 public static boolean quickCheckForNumber(CharSequence cs)
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60 if (cs.length() == 0 || !isStart(cs.charAt(0)))
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62 return cs.length() == 1 || isPart(cs.charAt(1));
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65 public static boolean isStart(int c)
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67 return isDigit(c) || c == '+' || c == '-';
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70 public static boolean isDigit(int c)
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72 return ('0' <= c && c <= '9') || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
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75 public static boolean isPart(int c)
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77 return isDigit(c) || isMarker(Character.toLowerCase(c));
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80 public static boolean isMarker(int lowerCase)
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99 public static NumberType getType(CharSequence cs)
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101 if (!quickCheckForNumber(cs))
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102 return NumberType.NONE;
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104 return NumberType.DECIMAL;
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105 if (isHexadecimal(cs))
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106 return NumberType.HEXADECIMAL;
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108 return NumberType.BINARY;
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110 return NumberType.OCTAL;
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111 if (isFloatingPoint(cs))
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112 return NumberType.FLOATINGPOINT;
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113 return NumberType.NONE;
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116 private static CharSequence extractSignAndDigits(NumberType type, CharSequence cs)
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118 return type.numberPattern.matcher(cs).replaceAll("$1$2").replaceAll("_", "");
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121 public static BigInteger valueOf(CharSequence cs)
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123 NumberType type = getType(cs);
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124 if (NumberType.NONE.equals(type))
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125 throw new NumberFormatException();
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126 return new BigInteger(extractSignAndDigits(type, cs).toString(), type.radix);
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129 public enum NumberType
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131 NONE(-1, null), BINARY(2, AsmNumberUtil.numberBin), OCTAL(8, AsmNumberUtil.numberOct), DECIMAL(10, AsmNumberUtil.numberDec),
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132 HEXADECIMAL(16, AsmNumberUtil.numberHex), FLOATINGPOINT(10, AsmNumberUtil.numberFloat);
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134 public final int radix;
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135 private final Pattern numberPattern;
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137 NumberType(int radix, Pattern numberPattern)
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139 this.radix = radix;
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140 this.numberPattern = numberPattern;
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