initial, really basic implementation of formatter

idea/src/META-INF/plugin.xml

@@ -28,6 +28,7 @@
       <lang.commenter language="jet" implementationClass="org.jetbrains.jet.plugin.JetCommenter"/>
       <lang.psiStructureViewFactory language="jet" implementationClass="org.jetbrains.jet.plugin.structureView.JetStructureViewFactory"/>
       <lang.foldingBuilder language="jet" implementationClass="org.jetbrains.jet.plugin.JetFoldingBuilder"/>
+      <lang.formatter language="jet" implementationClass="org.jetbrains.jet.plugin.formatter.JetFormattingModelBuilder"/>
       <annotator language="jet" implementationClass="org.jetbrains.jet.plugin.annotations.SoftKeywordsAnnotator"/>
       <annotator language="jet" implementationClass="org.jetbrains.jet.plugin.annotations.LabelsAnnotator"/>
       <annotator language="jet" implementationClass="org.jetbrains.jet.plugin.annotations.JetPsiChecker"/>
@@ -35,5 +36,6 @@
       <configurationType implementation="org.jetbrains.jet.plugin.run.JetRunConfigurationType"/>
       <codeInsight.lineMarkerProvider language="jet" implementationClass="org.jetbrains.jet.plugin.annotations.JetLineMarkerProvider"/>
       <iconProvider implementation="org.jetbrains.jet.plugin.JetIconProvider"/>
+      <fileTypeIndentOptionsProvider implementation="org.jetbrains.jet.plugin.formatter.JetIndentOptionsProvider"/>
   </extensions>
 </idea-plugin>

idea/src/org/jetbrains/jet/plugin/formatter/JetBlock.java

@@ -0,0 +1,146 @@
+package org.jetbrains.jet.plugin.formatter;
+
+import com.intellij.formatting.*;
+import com.intellij.lang.ASTNode;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.TokenType;
+import com.intellij.psi.codeStyle.CodeStyleSettings;
+import com.intellij.psi.tree.IElementType;
+import com.intellij.psi.tree.TokenSet;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.JetNodeTypes;
+import org.jetbrains.jet.lexer.JetTokens;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * @author yole
+ */
+public class JetBlock implements ASTBlock {
+    private ASTNode myNode;
+    private Alignment myAlignment;
+    private Indent myIndent;
+    private Wrap myWrap;
+    private CodeStyleSettings mySettings;
+    private List<Block> mySubBlocks;
+
+    private static final TokenSet CODE_BLOCKS = TokenSet.create(
+            JetNodeTypes.BLOCK,
+            JetNodeTypes.CLASS_BODY,
+            JetNodeTypes.FUNCTION_LITERAL);
+
+    private static final TokenSet STATEMENT_PARTS = TokenSet.create(
+            JetNodeTypes.THEN,
+            JetNodeTypes.ELSE);
+
+    public JetBlock(ASTNode node, Alignment alignment, Indent indent, Wrap wrap, CodeStyleSettings settings) {
+        myNode = node;
+        myAlignment = alignment;
+        myIndent = indent;
+        myWrap = wrap;
+        mySettings = settings;
+    }
+
+    @Override
+    public ASTNode getNode() {
+        return myNode;
+    }
+
+    @NotNull
+    @Override
+    public TextRange getTextRange() {
+        return myNode.getTextRange();
+    }
+
+    @Override
+    public Wrap getWrap() {
+        return myWrap;
+    }
+
+    @Override
+    public Indent getIndent() {
+        return myIndent;
+    }
+
+    @Override
+    public Alignment getAlignment() {
+        return myAlignment;
+    }
+
+    @NotNull
+    @Override
+    public List<Block> getSubBlocks() {
+        if (mySubBlocks == null) {
+            mySubBlocks = buildSubBlocks();
+        }
+        return new ArrayList<Block>(mySubBlocks);
+    }
+
+    private List<Block> buildSubBlocks() {
+        List<Block> blocks = new ArrayList<Block>();
+        for (ASTNode child = myNode.getFirstChildNode(); child != null; child = child.getTreeNext()) {
+
+          IElementType childType = child.getElementType();
+
+          if (child.getTextRange().getLength() == 0) continue;
+
+          if (childType == TokenType.WHITE_SPACE) {
+            continue;
+          }
+
+          blocks.add(buildSubBlock(child));
+        }
+        return Collections.unmodifiableList(blocks);
+    }
+
+    private Block buildSubBlock(ASTNode child) {
+        Wrap wrap = null;
+        Indent childIndent = Indent.getNoneIndent();
+        Alignment childAlignment = null;
+
+        if (CODE_BLOCKS.contains(myNode.getElementType())) {
+            childIndent = indentIfNotBrace(child);
+        }
+        else if (myNode.getElementType() == JetNodeTypes.WHEN) {
+            childIndent = indentIfNotBrace(child);
+        }
+        else if (STATEMENT_PARTS.contains(myNode.getElementType()) && child.getElementType() != JetNodeTypes.BLOCK) {
+            childIndent = Indent.getNormalIndent();
+        }
+
+        return new JetBlock(child, childAlignment, childIndent, wrap, mySettings);
+    }
+
+    private static Indent indentIfNotBrace(ASTNode child) {
+        return child.getElementType() == JetTokens.RBRACE || child.getElementType() == JetTokens.LBRACE
+                ? Indent.getNoneIndent()
+                : Indent.getNormalIndent();
+    }
+
+    @Override
+    public Spacing getSpacing(Block block, Block block1) {
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public ChildAttributes getChildAttributes(int newChildIndex) {
+        Indent childIndent = Indent.getNoneIndent();
+        if (CODE_BLOCKS.contains(myNode.getElementType()) || myNode.getElementType() == JetNodeTypes.WHEN) {
+            childIndent = Indent.getNormalIndent();
+        }
+        return new ChildAttributes(childIndent, null);
+    }
+
+    @Override
+    public boolean isIncomplete() {
+        return false;
+    }
+
+    @Override
+    public boolean isLeaf() {
+        return myNode.getFirstChildNode() == null;
+    }
+}

idea/src/org/jetbrains/jet/plugin/formatter/JetFormattingModelBuilder.java

@@ -0,0 +1,29 @@
+package org.jetbrains.jet.plugin.formatter;
+
+import com.intellij.formatting.FormattingModel;
+import com.intellij.formatting.FormattingModelBuilder;
+import com.intellij.formatting.FormattingModelProvider;
+import com.intellij.formatting.Indent;
+import com.intellij.lang.ASTNode;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.codeStyle.CodeStyleSettings;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * @author yole
+ */
+public class JetFormattingModelBuilder implements FormattingModelBuilder {
+    @NotNull
+    @Override
+    public FormattingModel createModel(PsiElement element, CodeStyleSettings settings) {
+        final JetBlock block = new JetBlock(element.getNode(), null, Indent.getNoneIndent(), null, settings);
+        return FormattingModelProvider.createFormattingModelForPsiFile(element.getContainingFile(), block, settings);
+    }
+
+    @Override
+    public TextRange getRangeAffectingIndent(PsiFile psiFile, int i, ASTNode astNode) {
+        return null;
+    }
+}

idea/src/org/jetbrains/jet/plugin/formatter/JetIndentOptionsProvider.java

@@ -0,0 +1,38 @@
+package org.jetbrains.jet.plugin.formatter;
+
+import com.intellij.application.options.IndentOptionsEditor;
+import com.intellij.application.options.SmartIndentOptionsEditor;
+import com.intellij.openapi.fileTypes.FileType;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.codeStyle.CodeStyleSettings;
+import com.intellij.psi.codeStyle.FileTypeIndentOptionsProvider;
+import org.jetbrains.jet.plugin.JetFileType;
+
+/**
+ * @author yole
+ */
+public class JetIndentOptionsProvider implements FileTypeIndentOptionsProvider {
+    @Override
+    public CodeStyleSettings.IndentOptions createIndentOptions() {
+        return new CodeStyleSettings.IndentOptions();
+    }
+
+    @Override
+    public FileType getFileType() {
+        return JetFileType.INSTANCE;
+    }
+
+    @Override
+    public IndentOptionsEditor createOptionsEditor() {
+        return new SmartIndentOptionsEditor();
+    }
+
+    @Override
+    public String getPreviewText() {
+        return "";
+    }
+
+    @Override
+    public void prepareForReformat(PsiFile psiFile) {
+    }
+}