com.google.template.soy.jssrc.dsl.Ternary.java Source code

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Here is the source code for com.google.template.soy.jssrc.dsl.Ternary.java

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/*
 * Copyright 2016 Google Inc.
 *
 * 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 com.google.template.soy.jssrc.dsl;

import static com.google.template.soy.exprtree.Operator.CONDITIONAL;

import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;
import com.google.errorprone.annotations.Immutable;
import com.google.template.soy.exprtree.Operator.Associativity;

/**
 * Represents a ternary expression. Its consequent and alternate chunks are required to be
 * representable as single expressions, though its predicate can be more complex.
 */
@AutoValue
@Immutable
abstract class Ternary extends Operation {
    abstract CodeChunk.WithValue predicate();

    abstract CodeChunk.WithValue consequent();

    abstract CodeChunk.WithValue alternate();

    static Ternary create(CodeChunk.WithValue predicate, CodeChunk.WithValue consequent,
            CodeChunk.WithValue alternate) {
        Preconditions.checkArgument(predicate.initialStatements().containsAll(consequent.initialStatements()));
        Preconditions.checkArgument(predicate.initialStatements().containsAll(alternate.initialStatements()));
        return new AutoValue_Ternary(
                ImmutableSet.<CodeChunk>builder().addAll(predicate.initialStatements())
                        .addAll(consequent.initialStatements()).addAll(alternate.initialStatements()).build(),
                predicate, consequent, alternate);
    }

    @Override
    int precedence() {
        return CONDITIONAL.getPrecedence();
    }

    @Override
    Associativity associativity() {
        return CONDITIONAL.getAssociativity();
    }

    @Override
    void doFormatInitialStatements(FormattingContext ctx) {
        ctx.appendInitialStatements(predicate());
        // consequent and alternate cannot have initial statements
    }

    @Override
    void doFormatOutputExpr(FormattingContext ctx) {
        formatOperand(predicate(), OperandPosition.LEFT, ctx);
        ctx.append(" ? ");
        formatOperand(consequent(), OperandPosition.LEFT, ctx);
        ctx.append(" : ");
        formatOperand(alternate(), OperandPosition.RIGHT, ctx);
    }

    @Override
    public void collectRequires(RequiresCollector collector) {
        predicate().collectRequires(collector);
        consequent().collectRequires(collector);
        alternate().collectRequires(collector);
    }
}