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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage;
import com.yahoo.javacc.FastCharStream;
import com.yahoo.vespa.indexinglanguage.expressions.Expression;
import com.yahoo.vespa.indexinglanguage.expressions.ScriptExpression;
import com.yahoo.vespa.indexinglanguage.expressions.StatementExpression;
import com.yahoo.vespa.indexinglanguage.parser.CharStream;
import com.yahoo.vespa.indexinglanguage.parser.IndexingParser;
import com.yahoo.vespa.indexinglanguage.parser.ParseException;
import com.yahoo.vespa.indexinglanguage.parser.TokenMgrException;
/**
* @author Simon Thoresen Hult
*/
public final class ScriptParser {
public static Expression parseExpression(ScriptParserContext config) throws ParseException {
return parse(config, new ParserMethod<Expression>() {
@Override
public Expression call(IndexingParser parser) throws ParseException {
return parser.root();
}
});
}
public static ScriptExpression parseScript(ScriptParserContext config) throws ParseException {
return parse(config, new ParserMethod<ScriptExpression>() {
@Override
public ScriptExpression call(IndexingParser parser) throws ParseException {
return parser.script();
}
});
}
public static StatementExpression parseStatement(ScriptParserContext config) throws ParseException {
return parse(config, new ParserMethod<StatementExpression>() {
@Override
public StatementExpression call(IndexingParser parser) throws ParseException {
try {
return parser.statement();
}
catch (TokenMgrException e) {
throw new ParseException(e.getMessage());
}
}
});
}
private interface ParserMethod<T extends Expression> {
T call(IndexingParser parser) throws ParseException;
}
private static <T extends Expression> T parse(ScriptParserContext context, ParserMethod<T> method)
throws ParseException {
CharStream input = context.getInputStream();
IndexingParser parser = new IndexingParser(input);
parser.setAnnotatorConfig(context.getAnnotatorConfig());
parser.setDefaultFieldName(context.getDefaultFieldName());
parser.setLinguistics(context.getLinguistcs());
parser.setEncoder(context.getEncoder());
try {
return method.call(parser);
} catch (ParseException e) {
if (!(input instanceof FastCharStream)) {
throw e;
}
throw new ParseException(((FastCharStream)input).formatException(e.getMessage()));
} finally {
if (parser.token != null && parser.token.next != null) {
input.backup(parser.token.next.image.length());
}
}
}
}
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