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Trino - AST matching support
/*
* Licensed 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.
*/
package io.trino.matching;
import io.trino.matching.pattern.CapturePattern;
import io.trino.matching.pattern.EqualsPattern;
import io.trino.matching.pattern.FilterPattern;
import io.trino.matching.pattern.TypeOfPattern;
import io.trino.matching.pattern.WithPattern;
import static java.lang.String.format;
public class DefaultPrinter
implements PatternVisitor
{
private final StringBuilder result = new StringBuilder();
private int level;
public String result()
{
return result.toString();
}
@Override
public void visitTypeOf(TypeOfPattern> pattern)
{
visitPrevious(pattern);
appendLine("typeOf(%s)", pattern.expectedClass().getSimpleName());
}
@Override
public void visitWith(WithPattern> pattern)
{
visitPrevious(pattern);
appendLine("with(%s)", pattern.getProperty().getName());
level += 1;
pattern.getPattern().accept(this);
level -= 1;
}
@Override
public void visitCapture(CapturePattern> pattern)
{
visitPrevious(pattern);
appendLine("capturedAs(%s)", pattern.capture().description());
}
@Override
public void visitEquals(EqualsPattern> pattern)
{
visitPrevious(pattern);
appendLine("equals(%s)", pattern.expectedValue());
}
@Override
public void visitFilter(FilterPattern> pattern)
{
visitPrevious(pattern);
appendLine("filter(%s)", pattern.predicate());
}
private void appendLine(String template, Object... arguments)
{
result.append("\t".repeat(level)).append(format(template + "\n", arguments));
}
}