indentvisitor.java

Python Development Environment (Python IDE plugin for Eclipse). Features editor, code completion, re

package org.python.pydev.refactoring.ast.visitors.position;

import org.python.pydev.parser.jython.SimpleNode;
import org.python.pydev.parser.jython.ast.Assert;
import org.python.pydev.parser.jython.ast.Assign;
import org.python.pydev.parser.jython.ast.Attribute;
import org.python.pydev.parser.jython.ast.AugAssign;
import org.python.pydev.parser.jython.ast.BinOp;
import org.python.pydev.parser.jython.ast.BoolOp;
import org.python.pydev.parser.jython.ast.Call;
import org.python.pydev.parser.jython.ast.Compare;
import org.python.pydev.parser.jython.ast.Delete;
import org.python.pydev.parser.jython.ast.Exec;
import org.python.pydev.parser.jython.ast.Expr;
import org.python.pydev.parser.jython.ast.GeneratorExp;
import org.python.pydev.parser.jython.ast.Import;
import org.python.pydev.parser.jython.ast.ImportFrom;
import org.python.pydev.parser.jython.ast.Print;
import org.python.pydev.parser.jython.ast.Suite;
import org.python.pydev.parser.jython.ast.TryFinally;
import org.python.pydev.parser.jython.ast.VisitorBase;

public class IndentVisitor extends VisitorBase {

	private static final int DEFAULT_INDENT = 4;

	private int indent;

	public IndentVisitor() {
		this.indent = DEFAULT_INDENT;
	}

	public int getIndent() {
		return indent;
	}

	private void handleDefault(SimpleNode node) {
		this.indent = node.beginColumn;
	}

	@Override
	public void traverse(SimpleNode node) throws Exception {
		// ignore
	}

	@Override
	protected Object unhandled_node(SimpleNode node) throws Exception {
		handleDefault(node);
		return null;
	}

	public void visit(SimpleNode node) throws Exception {
		if (node != null)
			node.accept(this);
	}

	public Object visitAssert(Assert node) throws Exception {
		handleDefault(node);
		this.indent -= 7;
		return null;
	}

	public Object visitAssign(Assign node) throws Exception {
		visit(node.targets[0]);
		return null;
	}

	public Object visitAttribute(Attribute node) throws Exception {
		visit(node.value);
		return null;
	}

	public Object visitAugAssign(AugAssign node) throws Exception {
		visit(node.target);
		return null;
	}

	public Object visitBinOp(BinOp node) throws Exception {
		visit(node.left);
		return null;
	}

	public Object visitBoolOp(BoolOp node) throws Exception {
		visit(node.values[0]);
		return null;
	}

	public Object visitCall(Call node) throws Exception {
		visit(node.func);
		return null;
	}

	public Object visitCompare(Compare node) throws Exception {
		visit(node.left);
		return null;
	}

	public Object visitDelete(Delete node) throws Exception {
		handleDefault(node);
		this.indent -= 4;
		return null;
	}

	public Object visitExec(Exec node) throws Exception {
		visit(node);
		this.indent -= 5;
		return null;
	}

	public Object visitExpr(Expr node) throws Exception {
		visit(node.value);
		return null;
	}

	public Object visitGeneratorExp(GeneratorExp node) throws Exception {
		visit(node.elt);
		return null;
	}

	@Override
	public Object visitImport(Import node) throws Exception {
		this.indent = 1;
		return null;
	}

	@Override
	public Object visitImportFrom(ImportFrom node) throws Exception {
		this.indent = 1;
		return null;
	}

	public Object visitPrint(Print node) throws Exception {
		handleDefault(node);
		this.indent -= 6;
		return null;
	}

	public Object visitSuite(Suite node) throws Exception {
		visit(node.body[0]);
		return null;
	}

	public Object visitTryFinally(TryFinally node) throws Exception {
		handleDefault(node);
		return null;
	}

}