com.google.idea.blaze.base.projectview.section.ListSectionParser.java Source code

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Here is the source code for com.google.idea.blaze.base.projectview.section.ListSectionParser.java

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/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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.idea.blaze.base.projectview.section;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.idea.blaze.base.projectview.parser.ParseContext;
import com.google.idea.blaze.base.projectview.parser.ProjectViewParser;
import com.google.idea.blaze.base.projectview.section.sections.ItemOrTextBlock;
import com.google.idea.blaze.base.projectview.section.sections.TextBlock;
import com.google.idea.blaze.base.projectview.section.sections.TextBlockSection;
import java.util.List;
import javax.annotation.Nullable;

/** List section parser base class. */
public abstract class ListSectionParser<T> extends SectionParser {
    private final SectionKey<T, ListSection<T>> key;

    protected ListSectionParser(SectionKey<T, ListSection<T>> key) {
        this.key = key;
    }

    @Override
    public SectionKey<T, ListSection<T>> getSectionKey() {
        return key;
    }

    @Nullable
    @Override
    public final ListSection<T> parse(ProjectViewParser parser, ParseContext parseContext) {
        if (parseContext.atEnd()) {
            return null;
        }

        String name = getName();
        if (!parseContext.current().text.equals(name + ':')) {
            return null;
        }
        parseContext.consume();

        ImmutableList.Builder<ItemOrTextBlock<T>> builder = ImmutableList.builder();

        boolean correctIndentationRun = true;
        List<ItemOrTextBlock<T>> savedTextBlocks = Lists.newArrayList();
        while (!parseContext.atEnd()) {
            boolean isIndented = parseContext.current().indent == SectionParser.INDENT;
            if (!isIndented && correctIndentationRun) {
                parseContext.savePosition();
            }
            correctIndentationRun = isIndented;

            ItemOrTextBlock<T> itemOrTextBlock = null;
            TextBlock textBlock = TextBlockSection.parseTextBlock(parseContext);
            if (textBlock != null) {
                itemOrTextBlock = new ItemOrTextBlock<>(textBlock);
            } else if (isIndented) {
                T item = parseItem(parser, parseContext);
                if (item != null) {
                    parseContext.consume();
                    itemOrTextBlock = new ItemOrTextBlock<>(item);
                }
            }

            if (itemOrTextBlock == null) {
                break;
            }

            if (isIndented) {
                builder.addAll(savedTextBlocks);
                builder.add(itemOrTextBlock);
                savedTextBlocks.clear();
                parseContext.clearSavedPosition();
            } else {
                savedTextBlocks.add(new ItemOrTextBlock<>(textBlock));
            }
        }
        parseContext.resetToSavedPosition();

        ImmutableList<ItemOrTextBlock<T>> items = builder.build();
        if (items.isEmpty()) {
            parseContext.addError(String.format("Empty section: '%s'", name));
        }

        return new ListSection<>(key, items);
    }

    @SuppressWarnings("unchecked")
    @Override
    public final void print(StringBuilder sb, Section<?> section) {
        ListSection<T> listSection = (ListSection<T>) section;

        // Omit empty sections completely
        if (listSection.itemsOrComments().isEmpty()) {
            return;
        }

        sb.append(getName()).append(':').append('\n');
        for (ItemOrTextBlock<T> item : listSection.itemsOrComments()) {
            if (item.item != null) {
                for (int i = 0; i < SectionParser.INDENT; ++i) {
                    sb.append(' ');
                }
                printItem(item.item, sb);
                sb.append('\n');
            } else if (item.textBlock != null) {
                item.textBlock.print(sb);
            }
        }
    }

    @Nullable
    protected abstract T parseItem(ProjectViewParser parser, ParseContext parseContext);

    protected abstract void printItem(T item, StringBuilder sb);
}