org.hisp.dhis.antlr.Parser Maven / Gradle / Ivy
package org.hisp.dhis.antlr;
/*
* Copyright (c) 2004-2020, University of Oslo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* Neither the name of the HISP project nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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*/
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.hisp.dhis.antlr.cache.Cache;
import org.hisp.dhis.antlr.cache.MappingFunction;
import org.hisp.dhis.antlr.cache.SimpleCacheBuilder;
import org.hisp.dhis.parser.expression.antlr.ExpressionBaseListener;
import org.hisp.dhis.parser.expression.antlr.ExpressionBaseVisitor;
import org.hisp.dhis.parser.expression.antlr.ExpressionLexer;
import org.hisp.dhis.parser.expression.antlr.ExpressionParser;
import java.util.concurrent.TimeUnit;
/**
* Parses an expression parser using the ANTLR4 parser, and traverses the
* parsed tree using the ANTLR4 visitor or listener patterns.
*
* @author Jim Grace
*/
public class Parser
{
private static Cache EXPRESSION_PARSE_TREES = null;
// -------------------------------------------------------------------------
// Logic
// -------------------------------------------------------------------------
/**
* Initialize the cache.
*/
public static void initializeCache()
{
EXPRESSION_PARSE_TREES = new SimpleCacheBuilder().forRegion( "expressionParseTrees" )
.expireAfterAccess( 10, TimeUnit.MINUTES )
.withInitialCapacity( 10000 )
.withMaximumSize( 50000 )
.build();
}
/**
* Parses an expression and visits the parsed nodes using the ANTLR4
* visitor pattern.
*
* @param expr the expression to parse and visit
* @param visitor the visitor instance
* @param useCache flag to use cache or by pass it
* @return the visitor value
*/
public static Object visit( String expr, ExpressionBaseVisitor
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