| 1 | /* |
| 2 | * Copyright (C) Christian Schulte, 2012-253 |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * |
| 9 | * o Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * |
| 12 | * o Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in |
| 14 | * the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 18 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 19 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * |
| 28 | * $JOMC: JavaLanguage.java 4962 2014-09-06 23:58:48Z schulte $ |
| 29 | * |
| 30 | */ |
| 31 | package org.jomc.model; |
| 32 | |
| 33 | import java.util.HashSet; |
| 34 | import java.util.Set; |
| 35 | |
| 36 | /** |
| 37 | * Java language support. |
| 38 | * |
| 39 | * @author <a href="mailto:cs@schulte.it">Christian Schulte</a> |
| 40 | * @version $JOMC: JavaLanguage.java 4962 2014-09-06 23:58:48Z schulte $ |
| 41 | * @since 1.4 |
| 42 | */ |
| 43 | class JavaLanguage |
| 44 | { |
| 45 | |
| 46 | /** Creates a new {@code JavaLanguage} instance. */ |
| 47 | JavaLanguage() |
| 48 | { |
| 49 | super(); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * The Java Language Specification - Java SE 7 Edition - Chapter 18. Syntax |
| 54 | * <pre> |
| 55 | * BasicType: |
| 56 | * byte |
| 57 | * short |
| 58 | * char |
| 59 | * int |
| 60 | * long |
| 61 | * float |
| 62 | * double |
| 63 | * </pre> |
| 64 | */ |
| 65 | static final Set<String> BASIC_TYPES = new HashSet<String>( 8 ); |
| 66 | |
| 67 | /** |
| 68 | * The Java Language Specification - Java SE 7 Edition - Chapter 3.10.3. Boolean Literals |
| 69 | * <pre> |
| 70 | * BooleanLiteral: one of |
| 71 | * true false |
| 72 | * </pre> |
| 73 | */ |
| 74 | static final Set<String> BOOLEAN_LITERALS = new HashSet<String>( 2 ); |
| 75 | |
| 76 | /** |
| 77 | * The Java Language Specification - Java SE 7 Edition - Chapter 3.9. Keywords |
| 78 | * <pre> |
| 79 | * Keyword: one of |
| 80 | * abstract continue for new switch |
| 81 | * assert default if package synchronized |
| 82 | * boolean do goto private this |
| 83 | * break double implements protected throw |
| 84 | * byte else import public throws |
| 85 | * case enum instanceof return transient |
| 86 | * catch extends int short try |
| 87 | * char final interface static void |
| 88 | * class finally long strictfp volatile |
| 89 | * const float native super while |
| 90 | * </pre> |
| 91 | */ |
| 92 | static final Set<String> KEYWORDS = new HashSet<String>( 50 ); |
| 93 | |
| 94 | /** |
| 95 | * The Java Language Specification - Java SE 7 Edition - Chapter 3.10.7. The Null Literal |
| 96 | * <pre> |
| 97 | * NullLiteral: |
| 98 | * null |
| 99 | * </pre> |
| 100 | */ |
| 101 | static final String NULL_LITERAL = "null"; |
| 102 | |
| 103 | static |
| 104 | { |
| 105 | // JLS - Java SE 7 Edition - Chapter 18. Syntax - BasicType |
| 106 | BASIC_TYPES.add( "boolean" ); |
| 107 | BASIC_TYPES.add( "byte" ); |
| 108 | BASIC_TYPES.add( "char" ); |
| 109 | BASIC_TYPES.add( "double" ); |
| 110 | BASIC_TYPES.add( "float" ); |
| 111 | BASIC_TYPES.add( "short" ); |
| 112 | BASIC_TYPES.add( "int" ); |
| 113 | BASIC_TYPES.add( "long" ); |
| 114 | |
| 115 | // JLS - Java SE 7 Edition - 3.10.3. Boolean Literals |
| 116 | BOOLEAN_LITERALS.add( "true" ); |
| 117 | BOOLEAN_LITERALS.add( "false" ); |
| 118 | |
| 119 | // JLS - Java SE 7 Edition - Chapter 3. Lexical Structure - 3.9. Keywords |
| 120 | KEYWORDS.add( "abstract" ); |
| 121 | KEYWORDS.add( "assert" ); |
| 122 | KEYWORDS.add( "boolean" ); |
| 123 | KEYWORDS.add( "break" ); |
| 124 | KEYWORDS.add( "byte" ); |
| 125 | KEYWORDS.add( "case" ); |
| 126 | KEYWORDS.add( "catch" ); |
| 127 | KEYWORDS.add( "char" ); |
| 128 | KEYWORDS.add( "class" ); |
| 129 | KEYWORDS.add( "const" ); |
| 130 | KEYWORDS.add( "continue" ); |
| 131 | KEYWORDS.add( "default" ); |
| 132 | KEYWORDS.add( "do" ); |
| 133 | KEYWORDS.add( "double" ); |
| 134 | KEYWORDS.add( "else" ); |
| 135 | KEYWORDS.add( "enum" ); |
| 136 | KEYWORDS.add( "extends" ); |
| 137 | KEYWORDS.add( "final" ); |
| 138 | KEYWORDS.add( "finally" ); |
| 139 | KEYWORDS.add( "float" ); |
| 140 | KEYWORDS.add( "for" ); |
| 141 | KEYWORDS.add( "if" ); |
| 142 | KEYWORDS.add( "goto" ); |
| 143 | KEYWORDS.add( "implements" ); |
| 144 | KEYWORDS.add( "import" ); |
| 145 | KEYWORDS.add( "instanceof" ); |
| 146 | KEYWORDS.add( "int" ); |
| 147 | KEYWORDS.add( "interface" ); |
| 148 | KEYWORDS.add( "long" ); |
| 149 | KEYWORDS.add( "native" ); |
| 150 | KEYWORDS.add( "new" ); |
| 151 | KEYWORDS.add( "package" ); |
| 152 | KEYWORDS.add( "private" ); |
| 153 | KEYWORDS.add( "protected" ); |
| 154 | KEYWORDS.add( "public" ); |
| 155 | KEYWORDS.add( "return" ); |
| 156 | KEYWORDS.add( "short" ); |
| 157 | KEYWORDS.add( "static" ); |
| 158 | KEYWORDS.add( "strictfp" ); |
| 159 | KEYWORDS.add( "super" ); |
| 160 | KEYWORDS.add( "switch" ); |
| 161 | KEYWORDS.add( "synchronized" ); |
| 162 | KEYWORDS.add( "this" ); |
| 163 | KEYWORDS.add( "throw" ); |
| 164 | KEYWORDS.add( "throws" ); |
| 165 | KEYWORDS.add( "transient" ); |
| 166 | KEYWORDS.add( "try" ); |
| 167 | KEYWORDS.add( "void" ); |
| 168 | KEYWORDS.add( "volatile" ); |
| 169 | KEYWORDS.add( "while" ); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Tests whether a given string is case-insensitively equal to a Java keyword. |
| 174 | * |
| 175 | * @param s The string to test. |
| 176 | * |
| 177 | * @return {@code true}, if {@code s} is case-insensitively equal to a Java keyword; {@code false}, if not. |
| 178 | */ |
| 179 | static boolean isKeyword( final String s ) |
| 180 | { |
| 181 | for ( final String keyword : KEYWORDS ) |
| 182 | { |
| 183 | if ( keyword.equalsIgnoreCase( s ) ) |
| 184 | { |
| 185 | return true; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Tests whether a given string is case-insensitively equal to a Java boolean literal. |
| 194 | * |
| 195 | * @param s The string to test. |
| 196 | * |
| 197 | * @return {@code true}, if {@code s} is case-insensitively equal to a Java boolean literal; {@code false}, if not. |
| 198 | */ |
| 199 | static boolean isBooleanLiteral( final String s ) |
| 200 | { |
| 201 | for ( final String literal : BOOLEAN_LITERALS ) |
| 202 | { |
| 203 | if ( literal.equalsIgnoreCase( s ) ) |
| 204 | { |
| 205 | return true; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | return false; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Tests whether a given string is case-insensitively equal to the Java {@code null} literal. |
| 214 | * |
| 215 | * @param s The string to test. |
| 216 | * |
| 217 | * @return {@code true}, if {@code s} is case-insensitively equal to the Java ·{@code null} literal; {@code false}, |
| 218 | * if not. |
| 219 | */ |
| 220 | static boolean isNullLiteral( final String s ) |
| 221 | { |
| 222 | return NULL_LITERAL.equalsIgnoreCase( s ); |
| 223 | } |
| 224 | |
| 225 | } |