com.thoughtworks.qdox.model.expression.Constant Maven / Gradle / Ivy
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QDox is a high speed, small footprint parser for extracting class/interface/method definitions from source files
complete with JavaDoc @tags. It is designed to be used by active code generators or documentation tools.
package com.thoughtworks.qdox.model.expression;
import java.util.regex.Pattern;
/*
* 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.
*/
public abstract class Constant
implements AnnotationValue
{
private final String image;
private Constant( String image )
{
this.image = image;
}
public abstract Object getValue();
public static Constant newBooleanLiteral( final String value )
{
return new Constant( value )
{
@Override
public Object getValue()
{
return toBoolean( value );
}
};
}
public static Constant newCharacterLiteral( final String value )
{
return new Constant( value )
{
@Override
public Object getValue()
{
return toChar( value );
}
};
}
public static Constant newFloatingPointLiteral( final String value )
{
return new Constant( value )
{
@Override
public Object getValue()
{
return toFloatingPointLiteral( value );
}
};
}
public static Constant newIntegerLiteral( final String value )
{
return new Constant( value )
{
@Override
public Object getValue()
{
return toIntegerLiteral( value );
}
};
}
public static Constant newStringLiteral( final String value )
{
return new Constant( value )
{
@Override
public Object getValue()
{
return toString( value );
}
};
}
public String getImage()
{
return image;
}
@Override
public String toString()
{
return image;
}
/** {@inheritDoc} */
public Object accept( ExpressionVisitor visitor )
{
return visitor.visit( this );
}
/** {@inheritDoc} */
public String getParameterValue()
{
return image;
}
protected static String convertString( String str )
{
StringBuilder buf = new StringBuilder();
boolean escaped = false;
int unicode = 0;
int value = 0;
int octal = 0;
boolean consumed = false;
for ( int i = 0; i < str.length(); ++i )
{
char ch = str.charAt( i );
if ( octal > 0 )
{
if ( value >= '0' && value <= '7' )
{
value = ( value << 3 ) | Character.digit( ch, 8 );
--octal;
consumed = true;
}
else
{
octal = 0;
}
if ( octal == 0 )
{
buf.append( (char) value );
value = 0;
}
}
if ( !consumed )
{
if ( unicode > 0 )
{
value = ( value << 4 ) | Character.digit( ch, 16 );
--unicode;
if ( unicode == 0 )
{
buf.append( (char) value );
value = 0;
}
}
else if ( escaped )
{
if ( ch == 'u' || ch == 'U' )
{
unicode = 4;
}
else if ( ch >= '0' && ch <= '7' )
{
octal = ( ch > '3' ) ? 1 : 2;
value = Character.digit( ch, 8 );
}
else
{
switch ( ch )
{
case 'b':
buf.append( '\b' );
break;
case 'f':
buf.append( '\f' );
break;
case 'n':
buf.append( '\n' );
break;
case 'r':
buf.append( '\r' );
break;
case 't':
buf.append( '\t' );
break;
case '\'':
buf.append( '\'' );
break;
case '\"':
buf.append( '\"' );
break;
case '\\':
buf.append( '\\' );
break;
default:
// yyerror( "Illegal escape character '" + ch + "'" );
}
}
escaped = false;
}
else if ( ch == '\\' )
{
escaped = true;
}
else
{
buf.append( ch );
}
}
}
return buf.toString();
}
protected static Boolean toBoolean( String value )
{
return Boolean.valueOf( value );
}
protected static Number toIntegerLiteral( String value )
{
String literal = value.replaceAll( "_", "" );
Number result;
int radix = 10; // default
int offset = 0;
if ( Pattern.compile( "^0[xX]" ).matcher( literal ).find() )
{
radix = 16;
offset = 2;
}
else if ( Pattern.compile( "^0[bB]" ).matcher( literal ).find() )
{
radix = 2;
offset = 2;
}
else if ( Pattern.compile( "^0[0-7]" ).matcher( literal ).find() )
{
radix = 8;
offset = 1;
}
if ( Pattern.compile( "[lL]$" ).matcher( literal ).find() )
{
result = Long.valueOf( literal.substring( offset, literal.length() - 1 ), radix );
}
else
{
result = Integer.valueOf( literal.substring( offset ), radix );
}
return result;
}
protected static Number toFloatingPointLiteral( String value )
{
String literal = value.replaceAll( "_", "" );
Number result;
if ( Pattern.compile( "[dD]$" ).matcher( literal ).find() )
{
result = Double.valueOf( literal.substring( 0, literal.length() - 1 ) );
}
else if ( Pattern.compile( "[fF]$" ).matcher( literal ).find() )
{
result = Float.valueOf( literal.substring( 0, literal.length() - 1 ) );
}
else
{
result = Float.valueOf( literal );
}
return result;
}
/**
* Convert a character literal into a character.
*
* @param value the single quoted value
* @return the transformed char
* @throws IllegalArgumentException if value is not a character literal
*/
protected static Character toChar( String value ) throws IllegalArgumentException
{
if ( !value.startsWith( "'" ) && !value.endsWith( "'" ) )
{
throw new IllegalArgumentException( "Character must be single quoted." );
}
String literal = convertString( value.substring( 1, value.length() - 1 ) );
if ( literal.length() != 1 )
{
throw new IllegalArgumentException( "Only one character allowed in character constants." );
}
return Character.valueOf( literal.charAt( 0 ) );
}
/**
* Convert a string literal into a string.
*
* @param value the double quoted value
* @return the transformed String
* @throws IllegalArgumentException if value is not a String literal
*/
protected static String toString( String value ) throws IllegalArgumentException
{
if ( value.length() < 2 && !value.startsWith( "\"" ) && !value.endsWith( "\"" ) )
{
throw new IllegalArgumentException( "String must be double quoted." );
}
return convertString( value.substring( 1, value.length() - 1 ) );
}
}