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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage.expressions;
import com.yahoo.document.DataType;
import com.yahoo.language.Linguistics;
import com.yahoo.language.process.Embedder;
import com.yahoo.language.simple.SimpleLinguistics;
import com.yahoo.vespa.indexinglanguage.ScriptParser;
import com.yahoo.vespa.indexinglanguage.ScriptParserContext;
import com.yahoo.vespa.indexinglanguage.parser.IndexingInput;
import com.yahoo.vespa.indexinglanguage.parser.ParseException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
/**
* @author Simon Thoresen Hult
*/
public final class StatementExpression extends ExpressionList<Expression> {
/** The names of the fields consumed by this. */
private final List<String> inputFields;
/** The name of the (last) output field this statement will write to, or null if none */
private String outputField;
public StatementExpression(Expression... lst) {
this(Arrays.asList(lst));
}
public StatementExpression(Iterable<Expression> lst) {
this(filterList(lst), null);
}
private StatementExpression(Iterable<Expression> list, Object unused) {
super(list, resolveInputType(list));
inputFields = List.copyOf(InputExpression.InputFieldNameExtractor.runOn(this));
}
/** Returns the input fields which are (perhaps optionally) consumed by some expression in this statement. */
public List<String> getInputFields() { return inputFields; }
@Override
protected void doExecute(ExecutionContext context) {
for (Expression expression : this) {
context.execute(expression);
}
}
@Override
protected void doVerify(VerificationContext context) {
for (Expression expression : this) {
if (expression instanceof OutputExpression)
outputField = ((OutputExpression)expression).getFieldName();
}
if (outputField != null)
context.setOutputField(outputField);
for (Expression expression : this)
context.execute(expression);
}
private static DataType resolveInputType(Iterable<Expression> lst) {
for (Expression exp : lst) {
DataType type = exp.requiredInputType();
if (type != null) return type;
type = exp.createdOutputType();
if (type != null) return null;
}
return null;
}
@Override
public DataType createdOutputType() {
for (int i = size(); --i >= 0; ) {
DataType type = get(i).createdOutputType();
if (type != null) return type;
}
return null;
}
@Override
public String toString() {
return asList().stream().map(Expression::toString).collect(Collectors.joining(" | "));
}
@Override
public boolean equals(Object obj) {
return super.equals(obj) && obj instanceof StatementExpression;
}
/** Creates an expression with simple lingustics for testing */
public static StatementExpression fromString(String expression) throws ParseException {
return fromString(expression, new SimpleLinguistics(), Embedder.throwsOnUse.asMap());
}
public static StatementExpression fromString(String expression, Linguistics linguistics, Map<String, Embedder> embedders) throws ParseException {
return newInstance(new ScriptParserContext(linguistics, embedders).setInputStream(new IndexingInput(expression)));
}
public static StatementExpression newInstance(ScriptParserContext config) throws ParseException {
return ScriptParser.parseStatement(config);
}
private static List<Expression> filterList(Iterable<Expression> lst) {
List<Expression> ret = new LinkedList<>();
for (Expression exp : lst) {
if (exp instanceof StatementExpression) {
ret.addAll(filterList((StatementExpression)exp));
} else if (exp != null) {
ret.add(exp);
}
}
return ret;
}
}
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