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/*
* JavaSyntaxRules.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1998 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.syntax;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.ptree.Block;
import io.devnulllabs.openjava.ptree.Expression;
import io.devnulllabs.openjava.ptree.ObjectList;
import io.devnulllabs.openjava.ptree.ParseTree;
import io.devnulllabs.openjava.ptree.ParseTreeException;
import io.devnulllabs.openjava.ptree.Statement;
import io.devnulllabs.openjava.ptree.TypeName;
import io.devnulllabs.openjava.ptree.util.MemberAccessCorrector;
import io.devnulllabs.openjava.tools.parser.ParseException;
import io.devnulllabs.openjava.tools.parser.Parser;
import io.devnulllabs.openjava.tools.parser.Token;
/**
* The class <code>JavaSyntaxRules</code>
* <p>
* For example
* <pre>
* </pre>
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: JavaSyntaxRules.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
* @see java.lang.Object
*/
public class JavaSyntaxRules implements TokenID
{
private JavaSyntaxRules() {}
private static ParseException lastException = null;
public static SyntaxException getLastException() {
return new SyntaxException( lastException );
}
private static ParseTree correct( ParseTree ptree, Environment env ) {
MemberAccessCorrector corrector
= new MemberAccessCorrector( env );
ObjectList holder = new ObjectList( ptree );
try {
ptree.accept( corrector );
} catch ( ParseTreeException e ) {
System.err.println( e.getMessage() );
}
return (ParseTree) holder.get( 0 );
}
private static void
adjustTokenSource( TokenSource token_src, Token last_token ) {
Token token = token_src.getToken( 0 );
while (token != last_token) {
token = token_src.getNextToken();
}
return;
}
/**
* Consumes a single expression from given token source.
*
* @param token_src token source
* @param env environment
* @return null if this fail, otherwise an expression.
*/
public static final Expression
consumeExpression( TokenSource token_src, Environment env ) {
if (env == null) env = token_src.getEnvironment();
RestorableTokenSource dummy = new RestorableTokenSource( token_src );
Parser parser = new Parser( dummy );
try {
Expression ptree = parser.Expression( env );
adjustTokenSource( token_src, parser.getToken( 0 ) );
return (Expression) correct( ptree, env );
} catch ( ParseException e ) {
lastException = e;
return null;
}
}
public static final Expression
consumeExpression( TokenSource token_src ) {
return consumeExpression( token_src, null );
}
/**
* Consumes a statement.
* This consumes only a pure statement excluding local variable
* declarations and local class declarations.
*
* @param token_src token source
* @return null if this fail, otherwise a statement.
*/
public static final Statement
consumeStatement( TokenSource token_src, Environment env ) {
if (env == null) env = token_src.getEnvironment();
RestorableTokenSource dummy = new RestorableTokenSource( token_src );
Parser parser = new Parser( dummy );
try {
Statement ptree = parser.Statement( env );
adjustTokenSource( token_src, parser.getToken( 0 ) );
return (Statement) correct( ptree, env );
} catch ( ParseException e ) {
lastException = e;
return null;
}
}
public static final Statement consumeStatement( TokenSource token_src ) {
return consumeStatement( token_src, token_src.getEnvironment() );
}
/**
* Consumes a block.
*
* @param token_src token source
* @return null if this fail, otherwise a block.
*/
public static final Block
consumeBlock( TokenSource token_src, Environment env ) {
if (env == null) env = token_src.getEnvironment();
RestorableTokenSource dummy = new RestorableTokenSource( token_src );
Parser parser = new Parser( dummy );
try {
Block ptree = parser.Block( env );
adjustTokenSource( token_src, parser.getToken( 0 ) );
return (Block) correct( ptree, env );
} catch ( ParseException e ) {
lastException = e;
return null;
}
}
public static final Block consumeBlock( TokenSource token_src ) {
return consumeBlock( token_src, token_src.getEnvironment() );
}
/**
* Consumes a type name.
* Including primitive type and reference type.
*
* @param token_src token source
* @return null if this fail, otherwise a block.
*/
public static final TypeName
consumeTypeName( TokenSource token_src ) {
Environment env = token_src.getEnvironment();
RestorableTokenSource dummy = new RestorableTokenSource( token_src );
Parser parser = new Parser( dummy );
try {
TypeName ptree = parser.Type( env );
adjustTokenSource( token_src, parser.getToken( 0 ) );
return (TypeName) correct( ptree, env );
} catch ( ParseException e ) {
lastException = e;
return null;
}
}
}
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