io.ebeaninternal.server.grammer.EqlParser Maven / Gradle / Ivy
package io.ebeaninternal.server.grammer;
import io.ebeaninternal.api.SpiQuery;
import io.ebeaninternal.server.grammer.antlr.EQLLexer;
import io.ebeaninternal.server.grammer.antlr.EQLParser;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
/**
* Parse EQL query language applying it to an ORM query object.
*/
public class EqlParser {
private static final ErrorListener errorListener = new ErrorListener();
/**
* Parse the raw EQL query and apply it to the supplied query.
*/
public static void parse(String raw, SpiQuery query) {
EQLLexer lexer = new EQLLexer(CharStreams.fromString(raw));
CommonTokenStream tokens = new CommonTokenStream(lexer);
EQLParser parser = new EQLParser(tokens);
parser.addErrorListener(errorListener);
EQLParser.Select_statementContext context = parser.select_statement();
EqlAdapter adapter = new EqlAdapter<>(query);
ParseTreeWalker walker = new ParseTreeWalker();
walker.walk(adapter, context);
query.simplifyExpressions();
}
static class ErrorListener extends BaseErrorListener {
@Override
public void syntaxError(Recognizer recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
String reportMsg = "line " + line + ":" + charPositionInLine + " " + msg;
throw new IllegalArgumentException(reportMsg);
}
}
}