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

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Here is the source code for com.google.template.soy.jssrc.dsl.Composite.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 com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.errorprone.annotations.Immutable;
import com.google.template.soy.jssrc.restricted.JsExpr;

/** Represents an expression preceded by one or more initial statements. */
@AutoValue
@Immutable
public abstract class Composite extends CodeChunk.WithValue {
    abstract ImmutableList<CodeChunk> initialStmts();

    abstract CodeChunk.WithValue value();

    static Composite create(ImmutableList<CodeChunk> initialStatements, CodeChunk.WithValue value) {
        Preconditions.checkState(!initialStatements.isEmpty());
        return new AutoValue_Composite(ImmutableSet.<CodeChunk>builder().addAll(initialStatements)
                .addAll(value.initialStatements()).build(), initialStatements, value);
    }

    /**
     * {@link CodeChunk#getCode} serializes both the chunk's initial statements and its output
     * expression. When a composite is the only chunk being serialized, and its value is a variable
     * reference, this leads to a redundant trailing expression (the variable name). Override the
     * superclass implementation to omit it.
     */
    @Override
    String getCode(int startingIndent, OutputContext outputContext) {
        return value() instanceof VariableReference
                ? new FormattingContext(startingIndent).appendInitialStatements(this).toString()
                : super.getCode(startingIndent, outputContext);
    }

    @Override
    void doFormatInitialStatements(FormattingContext ctx) {
        for (CodeChunk stmt : initialStmts()) {
            ctx.appendAll(stmt);
        }
        ctx.appendInitialStatements(value());
    }

    @Override
    public void collectRequires(RequiresCollector collector) {
        for (CodeChunk stmt : initialStmts()) {
            stmt.collectRequires(collector);
        }
        value().collectRequires(collector);
    }

    @Override
    void doFormatOutputExpr(FormattingContext ctx) {
        ctx.appendOutputExpression(value());
    }

    @Override
    public JsExpr singleExprOrName() {
        return value().singleExprOrName();
    }
}