intellij-sdk-code-samples/src/com/simpleplugin/SimpleBlock.java

package com.simpleplugin;

import com.intellij.formatting.*;
import com.intellij.lang.ASTNode;
import com.intellij.psi.TokenType;
import com.intellij.psi.formatter.common.AbstractBlock;
import com.simpleplugin.psi.SimpleTypes;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

public class SimpleBlock extends AbstractBlock {
    private SpacingBuilder spacingBuilder;

    protected SimpleBlock(@NotNull ASTNode node, @Nullable Wrap wrap, @Nullable Alignment alignment,
                          SpacingBuilder spacingBuilder) {
        super(node, wrap, alignment);
        this.spacingBuilder = spacingBuilder;
    }

    @Override
    protected List<Block> buildChildren() {
        List<Block> blocks = new ArrayList<Block>();
        ASTNode child = myNode.getFirstChildNode();
        ASTNode previousChild = null;
        while (child != null) {
            if (child.getElementType() != TokenType.WHITE_SPACE &&
                    (previousChild == null || previousChild.getElementType() != SimpleTypes.CRLF ||
                            child.getElementType() != SimpleTypes.CRLF)) {
                Block block = new SimpleBlock(child, Wrap.createWrap(WrapType.NONE, false), Alignment.createAlignment(),
                        spacingBuilder);
                blocks.add(block);
            }
            previousChild = child;
            child = child.getTreeNext();
        }
        return blocks;
    }

    @Override
    public Indent getIndent() {
        return Indent.getNoneIndent();
    }

    @Nullable
    @Override
    public Spacing getSpacing(@Nullable Block child1, @NotNull Block child2) {
        return spacingBuilder.getSpacing(this, child1, child2);
    }

    @Override
    public boolean isLeaf() {
        return myNode.getFirstChildNode() == null;
    }
}