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| package org.apache.hivemind.conditional; |
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| import org.apache.hivemind.util.Defense; |
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| class Lexer |
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| { |
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| private char[] _input; |
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| |
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| private int _cursor = 0; |
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| private static final Token OPAREN = new Token(TokenType.OPAREN); |
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| private static final Token CPAREN = new Token(TokenType.CPAREN); |
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| private static final Token AND = new Token(TokenType.AND); |
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| private static final Token OR = new Token(TokenType.OR); |
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| private static final Token NOT = new Token(TokenType.NOT); |
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| private static final Token PROPERTY = new Token(TokenType.PROPERTY); |
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| private static final Token CLASS = new Token(TokenType.CLASS); |
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| Lexer(String input)
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| { |
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| Defense.notNull(input, "input");
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| _input = input.toCharArray();
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| } |
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| Token next()
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| { |
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| while (_cursor < _input.length)
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| { |
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| char ch = _input[_cursor];
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| if (ch == ')')
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| { |
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| _cursor++;
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| return CPAREN;
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| } |
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| if (ch == '(')
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| { |
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| _cursor++;
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| return OPAREN;
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| } |
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| if (Character.isWhitespace(ch))
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| { |
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| _cursor++;
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| continue;
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| } |
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| if (isSymbolChar(ch))
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| return readSymbol();
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| throw new RuntimeException(ConditionalMessages.unexpectedCharacter(_cursor, _input));
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| } |
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| return null;
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| } |
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| private boolean isSymbolChar(char ch)
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| { |
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| return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9')
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| || (ch == '-') || (ch == '.') || (ch == '_'); |
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| } |
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| private Token readSymbol()
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| { |
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| int start = _cursor;
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| while (true)
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| { |
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| _cursor++;
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| if (_cursor >= _input.length)
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| break;
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| if (!isSymbolChar(_input[_cursor]))
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| break;
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| } |
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| String symbol = new String(_input, start, _cursor - start);
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| if (symbol.equalsIgnoreCase("and"))
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| return AND;
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| if (symbol.equalsIgnoreCase("or"))
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| return OR;
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| if (symbol.equalsIgnoreCase("not"))
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| return NOT;
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| if (symbol.equalsIgnoreCase("property"))
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| return PROPERTY;
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| if (symbol.equalsIgnoreCase("class"))
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| return CLASS;
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| return new Token(TokenType.SYMBOL, symbol);
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| } |
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| } |