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    <title>JSDoc: Source: python_to_blockly.js</title>

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    <h1 class="page-title">Source: python_to_blockly.js</h1>

    
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            <pre class="prettyprint source linenums"><code>/**
 * An object for converting Python source code to the
 * Blockly XML representation.
 * 
 * @constructor
 * @this {PythonToBlocks}
 */
function PythonToBlocks() {
}

function xmlToString(xml) {
    return new XMLSerializer().serializeToString(xml);
}

PythonToBlocks.prototype.convertSourceToCodeBlock = function(python_source) {
    var xml = document.createElement("xml");
    xml.appendChild(raw_block(python_source));
    return xmlToString(xml);
}

/**
 * The main function for converting a string representation of Python
 * code to the Blockly XML representation.
 *
 * @param {string} python_source - The string representation of Python
 *      code (e.g., "a = 0").
 * @returns {Object} An object which will either have the converted
 *      source code or an error message and the code as a code-block.
 */
PythonToBlocks.prototype.convertSource = function(python_source) {
    var xml = document.createElement("xml");
    if (python_source.trim() === "") {
        return {"xml": xmlToString(xml), "error": null};
    }
    this.source = python_source.split("\n");
    var filename = 'user_code.py';
    // Attempt parsing - might fail!
    var parse, ast, symbol_table, error;
    try {
        parse = Sk.parse(filename, python_source);
        ast = Sk.astFromParse(parse.cst, filename, parse.flags);
        //symbol_table = Sk.symboltable(ast, filename, python_source, filename, parse.flags);
    } catch (e) {
        error = e;
        xml.appendChild(raw_block(python_source))
        return {"xml": xmlToString(xml), "error": error};
    }
    this.comments = {};
    for (var commentLocation in parse.comments) {
        var lineColumn = commentLocation.split(",");
        var yLocation = parseInt(lineColumn[0], 10);
        this.comments[yLocation] = parse.comments[commentLocation];
    }
    this.highestLineSeen = 0;
    this.levelIndex = 0;
    this.nextExpectedLine = 0;
    this.measureNode(ast);
    var converted = this.convert(ast);
    if (converted !== null) {
        for (var block = 0; block &lt; converted.length; block+= 1) {
            xml.appendChild(converted[block]);
        }
    }
    return {"xml": xmlToString(xml), "error": null, "lineMap": this.lineMap, 'comment': this.comments};
}

PythonToBlocks.prototype.identifier = function(node) {
    return Sk.ffi.remapToJs(node);
}

PythonToBlocks.prototype.recursiveMeasure = function(node, nextBlockLine) {
    if (node === undefined)  {
        return;
    }
    var myNext = nextBlockLine;
    if ("orelse" in node &amp;&amp; node.orelse.length > 0) {
        if (node.orelse.length == 1 &amp;&amp; node.orelse[0]._astname == "If") {
            myNext = node.orelse[0].lineno-1;
        } else {
            myNext = node.orelse[0].lineno-1-1;
        }
    }
    this.heights.push(nextBlockLine);
    if ("body" in node) {
        for (var i = 0; i &lt; node.body.length; i++) {
            var next;
            if (i+1 == node.body.length) {
                next = myNext;
            } else {
                next = node.body[i+1].lineno-1;
            }
            this.recursiveMeasure(node.body[i], next);
        }
    }
    if ("orelse" in node) {
        for (var i = 0; i &lt; node.orelse.length; i++) {
            var next;
            if (i == node.orelse.length) {
                next = nextBlockLine;
            } else {
                next = 1+(node.orelse[i].lineno-1);
            }
            this.recursiveMeasure(node.orelse[i], next);
        }
    }
}

PythonToBlocks.prototype.measureNode = function(node) {
    this.heights = [];
    this.recursiveMeasure(node, this.source.length-1);
    this.heights.shift();
}

PythonToBlocks.prototype.getSourceCode = function(frm, to) {
    var lines = this.source.slice(frm-1, to);
    // Strip out any starting indentation.
    if (lines.length > 0) {
        var indentation = lines[0].search(/\S/);
        for (var i = 0; i &lt; lines.length; i++) {
            lines[i] = lines[i].substring(indentation);
        }
    }
    return lines.join("\n");
}

PythonToBlocks.prototype.convertBody = function(node, is_top_level) {
    this.levelIndex += 1;
    // Empty body, return nothing
    if (node.length == 0) {
        return null;
    }
    
    // Final result list
    var children = [], // The complete set of peers
        root = null, // The top of the current peer
        current = null,
        levelIndex = this.levelIndex; // The bottom of the current peer
        
    function addPeer(peer) {
        if (root == null) {
            children.push(peer);
        } else {
            children.push(root);
        }
        root = peer;
        current = peer;
    }
    
    function finalizePeers() {
        if (root != null) {
            children.push(root);
        }
    }
    
    function nestChild(child) {
        if (root == null) {
            root = child;
            current = child;
        } else if (current == null) {
            root = current;
        } else {
            var nextElement = document.createElement("next");
            nextElement.appendChild(child);
            current.appendChild(nextElement);
            current = child;
        }
    }
    
    var lineNumberInBody = 0,
        lineNumberInProgram,
        previousLineInProgram=null,
        distance,
        skipped_line,
        commentCount,
        previousHeight = null,
        visitedFirstLine = false;
        
    // Iterate through each node
    for (var i = 0; i &lt; node.length; i++) {
        lineNumberInBody += 1;
        
        lineNumberInProgram = node[i].lineno;
        distance = 0, wasFirstLine = true;
        if (previousLineInProgram != null) {
            distance = lineNumberInProgram - previousLineInProgram-1;
            wasFirstLine = false;
        }
        lineNumberInBody += distance;
        
        // Handle earlier comments
        commentCount = 0;
        for (var commentLineInProgram in this.comments) {
            if (commentLineInProgram &lt; lineNumberInProgram) {
                commentChild = this.Comment(this.comments[commentLineInProgram], commentLineInProgram);
                if (previousLineInProgram == null) {
                    nestChild(commentChild);
                } else {
                    skipped_previous_line = Math.abs(previousLineInProgram-commentLineInProgram) > 1;
                    if (is_top_level &amp;&amp; skipped_previous_line) {
                        addPeer(commentChild);
                    } else {
                        nestChild(commentChild);
                    }
                }
                previousLineInProgram = commentLineInProgram;
                this.highestLineSeen = Math.max(this.highestLineSeen, parseInt(commentLineInProgram, 10));
                distance = lineNumberInProgram - previousLineInProgram;
                delete this.comments[commentLineInProgram];
                commentCount += 1;
            }
        }
        
        distance = lineNumberInProgram - this.highestLineSeen;
        this.highestLineSeen = Math.max(lineNumberInProgram, this.highestLineSeen);
        
        // Now convert the actual node
        var height = this.heights.shift();
        var originalSourceCode = this.getSourceCode(lineNumberInProgram, height);
        var newChild = this.convertStatement(node[i], originalSourceCode, is_top_level);
        
        // Skip null blocks (e.g., imports)
        if (newChild == null) {
            continue;
        }
        
        skipped_line = distance > 1;
        previousLineInProgram = lineNumberInProgram;
        previousHeight = height;
        
        // Handle top-level expression blocks
        if (is_top_level &amp;&amp; newChild.constructor == Array) {
            addPeer(newChild[0]);
        // Handle skipped line
        } else if (is_top_level &amp;&amp; skipped_line &amp;&amp; visitedFirstLine) {
            addPeer(newChild);
        // Otherwise, always embed it in there.
        } else {
            nestChild(newChild);
        }
        
        visitedFirstLine = true;
    }
    
    
    // Handle comments that are on the very last line
    var lastLineNumber = lineNumberInProgram+1
    if (lastLineNumber in this.comments) {
        commentChild = this.Comment(this.comments[lastLineNumber], lastLineNumber);
        nestChild(commentChild);
        delete this.comments[lastLineNumber];
    }
    
    // Handle any extra comments that stuck around
    if (is_top_level) {
        for (var commentLineInProgram in this.comments) {
            commentChild = this.Comment(this.comments[commentLineInProgram], commentLineInProgram);
            distance = commentLineInProgram - previousLineInProgram;
            if (previousLineInProgram == null) {
                addPeer(commentChild);
            } else if (distance > 1) {
                addPeer(commentChild);
            } else {
                nestChild(commentChild);
            }
            previousLineInProgram = commentLineInProgram;
            delete this.comments[lastLineNumber];
        }
    }
    
    
    finalizePeers();
    
    this.levelIndex -= 1;
    
    return children;
}


function block(type, lineNumber, fields, values, settings, mutations, statements) {
    var newBlock = document.createElement("block");
    // Settings
    newBlock.setAttribute("type", type);
    newBlock.setAttribute("line_number", lineNumber);
    for (var setting in settings) {
        var settingValue = settings[setting];
        newBlock.setAttribute(setting, settingValue);
    }
    // Mutations
    if (mutations !== undefined &amp;&amp; Object.keys(mutations).length > 0) {
        var newMutation = document.createElement("mutation");
        for (var mutation in mutations) {
            var mutationValue = mutations[mutation];
            if (mutation.charAt(0) == '@') {
                newMutation.setAttribute(mutation.substr(1), mutationValue);
            } else if (mutationValue.constructor === Array) {
                for (var i = 0; i &lt; mutationValue.length; i++) {
                    var mutationNode = document.createElement(mutation);
                    mutationNode.setAttribute("name", mutationValue[i]);
                    newMutation.appendChild(mutationNode);
                }
            } else {
                var mutationNode = document.createElement("arg");
                mutationNode.setAttribute("name", mutation);
                mutationNode.appendChild(mutationValue);
                newMutation.appendChild(mutationNode);
            }
        }
        newBlock.appendChild(newMutation);
    }
    // Fields
    for (var field in fields) {
        var fieldValue = fields[field];
        var newField = document.createElement("field");
        newField.setAttribute("name", field);
        newField.appendChild(document.createTextNode(fieldValue));
        newBlock.appendChild(newField);
    }
    // Values
    for (var value in values) {
        var valueValue = values[value];
        var newValue = document.createElement("value");
        if (valueValue !== null) {
            newValue.setAttribute("name", value);
            newValue.appendChild(valueValue);
            newBlock.appendChild(newValue);
        }
    }
    // Statements
    if (statements !== undefined &amp;&amp; Object.keys(statements).length > 0) {
        for (var statement in statements) {
            var statementValue = statements[statement];
            if (statementValue == null) {
                continue;
            } else {
                for (var i = 0; i &lt; statementValue.length; i += 1) {
                    // In most cases, you really shouldn't ever have more than
                    //  one statement in this list. I'm not sure Blockly likes
                    //  that.
                    var newStatement = document.createElement("statement");
                    newStatement.setAttribute("name", statement);
                    newStatement.appendChild(statementValue[i]);
                    newBlock.appendChild(newStatement);
                }
            }
        }
    }
    return newBlock;
}

raw_block = function(txt) {
    // TODO: lineno as second parameter!
    return block("raw_block", 0, { "TEXT": txt });
}

raw_expression = function(txt, lineno) {
    return block("raw_expression", lineno, {"TEXT": txt});
}

PythonToBlocks.prototype.convert = function(node, is_top_level) {
    return this[node._astname](node, is_top_level);
}

function arrayMax(array) {
  return array.reduce(function(a, b) {
    return Math.max(a, b);
  });
}

function arrayMin(array) {
  return array.reduce(function(a, b) {
    return Math.min(a, b);
  });
}

PythonToBlocks.prototype.convertStatement = function(node, full_source, is_top_level) {
    try {
        return this.convert(node, is_top_level);
    } catch (e) {
        heights = this.getChunkHeights(node);
        extractedSource = this.getSourceCode(arrayMin(heights), arrayMax(heights));
        console.error(e);
        return raw_block(extractedSource);
    }
}

PythonToBlocks.prototype.getChunkHeights = function(node) {
    var lineNumbers = [];
    if (node.hasOwnProperty("lineno")) {
        lineNumbers.push(node.lineno);
    }
    if (node.hasOwnProperty("body")) {
        for (var i = 0; i &lt; node.body.length; i += 1) {
            var subnode = node.body[i];
            lineNumbers = lineNumbers.concat(this.getChunkHeights(subnode));
        }
    }
    if (node.hasOwnProperty("orelse")) {
        for (var i = 0; i &lt; node.orelse.length; i += 1) {
            var subnode = node.orelse[i];
            lineNumbers = lineNumbers.concat(this.getChunkHeights(subnode));
        }
    }
    return lineNumbers;
}

/* ----- Nodes ---- */
/*
 * NO LINE OR COLUMN NUMBERS
 * Module
 * body: asdl_seq
 */
PythonToBlocks.prototype.Module = function(node)
{
    return this.convertBody(node.body, true);
}

PythonToBlocks.prototype.Comment = function(txt, lineno) {
    return block("comment_single", lineno, {
        "BODY": txt.slice(1)
    }, {}, {}, {}, {})
}

/*
 * NO LINE OR COLUMN NUMBERS
 * Interactive
 * body: asdl_seq
 */
PythonToBlocks.prototype.Interactive = function(body)
{
    return this.convertBody(node.body);
}

/*
 * NO LINE OR COLUMN NUMBERS
 * TODO
 * body: expr_ty
 */
PythonToBlocks.prototype.Expression = function(body)
{
    this.body = body;
}

/*
 * NO LINE OR COLUMN NUMBERS
 *
 * body: asdl_seq
 */
PythonToBlocks.prototype.Suite = function(body)
{
    this.asdl_seq(node.body);
}

/*
 *
 * name: identifier
 * args: arguments__ty
 * body: asdl_seq
 * decorator_list: asdl_seq
 */
PythonToBlocks.prototype.FunctionDef = function(node)
{
    var name = node.name;
    var args = node.args;
    var body = node.body;
    var decorator_list = node.decorator_list;
    if (decorator_list.length > 0) {
        throw new Error("Decorators are not implemented.");
    }
    return block("procedures_defnoreturn", node.lineno, {
        "NAME": this.identifier(name)
    }, {
    }, {
        "inline": "false"
    }, {
        "arg": this.arguments_(args)
    }, {
        "STACK": this.convertBody(body)
    });
}

/*
 * name: identifier
 * args: arguments__ty
 * bases: asdl_seq
 * body: asdl_seq
 * decorator_list: asdl_seq
 */
PythonToBlocks.prototype.ClassDef = function(node)
{
    var name = node.name;
    var bases = node.bases;
    var body = node.body;
    var decorator_list = node.decorator_list;
    if (decorator_list.length > 0) {
        throw new Error("Decorators are not implemented.");
    }
    return block("class_creation", node.lineno, {
        "CLASS": this.identifier(name)
    }, {
    }, {
        "inline": "false"
    }, {
        //"arg": this.arguments_(args)
    }, {
        "BODY": this.convertBody(body)
    });
}

/*
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.Return = function(node)
{
    var value = node.value;
    // No field, one title, one setting
    return block("procedures_return", node.lineno, {}, {
        "VALUE": this.convert(value)
    }, {
        "inline": "false"
    });
}

/*
 * targets: asdl_seq
 *
 */
PythonToBlocks.prototype.Delete = function(/* {asdl_seq *} */ targets)
{
    this.targets = targets;
    // TODO
    throw new Error("Delete is not implemented");
}

/*
 * targets: asdl_seq
 * value: expr_ty
 */
PythonToBlocks.prototype.Assign = function(node)
{
    var targets = node.targets;
    var value = node.value;
    if (targets.length == 0) {
        throw new Error("Nothing to assign to!");
    } else if (targets.length == 1) {
        return block("variables_set", node.lineno, {
            "VAR": this.Name_str(targets[0]) //targets
        }, {
            "VALUE": this.convert(value)
        });
    } else {
        //TODO
        throw new Error("Multiple Assigment Targets Not implemented");
    }
}

/*
 * target: expr_ty
 * op: operator_ty
 * value: expr_ty
 */
PythonToBlocks.prototype.AugAssign = function(node)
{
    var target = node.target;
    var op = node.op;
    var value = node.value;
    if (op.name != "Add") {
        //TODO
        throw new Error("Only addition is currently supported for augmented assignment!");
    } else {
        return block("math_change", node.lineno, {
            "VAR": this.Name_str(target)
        }, {
            "DELTA": this.convert(value)
        });
    }
}

/*
 * dest: expr_ty
 * values: asdl_seq
 * nl: bool
 *
 */
PythonToBlocks.prototype.Print = function(node)
{
    var dest = node.dest;
    var values = node.values;
    var nl = node.nl;
    
    if (values.length == 1) {
        return block("text_print", node.lineno, {}, {
            "TEXT": this.convert(values[0])
        });
    } else {
        return block("text_print_multiple", node.lineno, {}, 
            this.convertElements("PRINT", values), 
        {
            "inline": "true"
        }, {
            "@items": values.length
        });
    }
}

/*
 * target: expr_ty
 * iter: expr_ty
 * body: asdl_seq
 * orelse: asdl_seq
 *
 */
PythonToBlocks.prototype.For = function(node) {
    var target = node.target;
    var iter = node.iter;
    var body = node.body;
    var orelse = node.orelse;
    
    if (orelse.length > 0) {
        // TODO
        throw new Error("Or-else block of For is not implemented.");
    }
    
    return block("controls_forEach", node.lineno, {
    }, {
        "LIST": this.convert(iter),
        "VAR": this.convert(target)
    }, {
        "inline": "true"
    }, {}, {
        "DO": this.convertBody(body)
    });
}

/*
 * test: expr_ty
 * body: asdl_seq
 * orelse: asdl_seq
 */
PythonToBlocks.prototype.While = function(node) {
    var test = node.test;
    var body = node.body;
    var orelse = node.orelse;
    if (orelse.length > 0) {
        // TODO
        throw new Error("Or-else block of While is not implemented.");
    }
    return block("controls_while", node.lineno, {}, {
        "BOOL": this.convert(test)
    }, {}, {}, {
        "DO": this.convertBody(body)
    });
}

/*
 * test: expr_ty
 * body: asdl_seq
 * orelse: asdl_seq
 *
 */
PythonToBlocks.prototype.If = function(node)
{
    var test = node.test;
    var body = node.body;
    var orelse = node.orelse;
    
    var IF_values = {"IF0": this.convert(test)};
    var DO_values = {"DO0": this.convertBody(body)};
    
    var elseifCount = 0;
    var elseCount = 0;
    var potentialElseBody = null;
    
    // Handle weird orelse stuff
    if (orelse !== undefined) {
        if (orelse.length == 1 &amp;&amp; orelse[0]._astname == "If") {
            // This is an 'ELIF'
            while (orelse.length == 1  &amp;&amp; orelse[0]._astname == "If") {
                this.heights.shift();
                elseifCount += 1;
                body = orelse[0].body;
                test = orelse[0].test;
                orelse = orelse[0].orelse;
                DO_values["DO"+elseifCount] = this.convertBody(body, false);
                if (test !== undefined) {
                    IF_values["IF"+elseifCount] = this.convert(test);
                }
            }
        }
        if (orelse !== undefined &amp;&amp; orelse.length > 0) {
            // Or just the body of an Else statement
            elseCount += 1;
            DO_values["ELSE"] = this.convertBody(orelse);
        }
    }
    
    return block("controls_if", node.lineno, {
    }, IF_values, {
        "inline": "false"
    }, {
        "@elseif": elseifCount,
        "@else": elseCount
    }, DO_values);
}

/*
 * context_expr: expr_ty
 * optional_vars: expr_ty
 * body: asdl_seq
 */
PythonToBlocks.prototype.With = function(node)
{
    var context_expr = node.context_expr;
    var optional_vars = node.optional_vars;
    var body = node.body;
    throw new Error("With_ not implemented");
}

/*
 * type: expr_ty
 * inst: expr_ty
 * tback: expr_ty
 */
PythonToBlocks.prototype.Raise = function(node)
{
    var type = node.type;
    var inst = node.inst;
    var tback = node.tback;
    throw new Error("Raise not implemented");
}

/*
 * body: asdl_seq
 * handlers: asdl_seq
 * orelse: asdl_seq
 *
 */
PythonToBlocks.prototype.TryExcept = function(node)
{
    var body = node.body;
    var handlers = node.handlers;
    var orelse = node.orelse;
    throw new Error("TryExcept not implemented");
}

/*
 * body: asdl_seq
 * finalbody: asdl_seq
 *
 */
PythonToBlocks.prototype.TryFinally = function(node)
{
    var body = node.body;
    var finalbody = node.finalbody;
    throw new Error("TryExcept not implemented");
}

/*
 * test: expr_ty
 * msg: expr_ty
 */
PythonToBlocks.prototype.Assert = function(node)
{
    var test = node.test;
    var msg = node.msg;
    throw new Error("Assert not implemented");
}

/*
 * names: asdl_seq
 *
 */
PythonToBlocks.prototype.Import = function(node)
{
    var names = node.names;
    // The import statement isn't used in blockly because it happens implicitly
    return null;
}

/*
 * module: identifier
 * names: asdl_seq
 * level: int
 *
 */
PythonToBlocks.prototype.ImportFrom = function(node)
{
    var module = node.module;
    var names = node.names;
    var level = node.level;
    // The import statement isn't used in blockly because it happens implicitly
    return null;
}

/*
 * body: expr_ty
 * globals: expr_ty
 * locals: expr_ty
 *
 */
PythonToBlocks.prototype.Exec = function(node) {
    var body = node.body;
    var globals = node.globals;
    var locals = node.locals;
    throw new Error("Exec not implemented");
}

/*
 * names: asdl_seq
 *
 */
PythonToBlocks.prototype.Global = function(node)
{
    var names = node.names;
    throw new Error("Globals not implemented");
}

/*
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.Expr = function(node, is_top_level) {
    var value = node.value;
    
    var converted = this.convert(value);
    if (converted.constructor == Array) {
        return converted[0];
    } else if (is_top_level === true) {
        return [this.convert(value)];
    } else {
        return block("raw_empty", node.lineno, {}, {
            "VALUE": this.convert(value)
        });
    }
}

/*
 *
 *
 */
PythonToBlocks.prototype.Pass = function() {
    return null; //block("controls_pass");
}

/*
 *
 *
 */
PythonToBlocks.prototype.Break = function(node) {
    return block("controls_flow_statements", node.lineno, {
        "FLOW": "BREAK"
    });
}

/*
 *
 *
 */
PythonToBlocks.prototype.Continue = function(node) {
    return block("controls_flow_statements", node.lineno, {
        "FLOW": "CONTINUE"
    });
}

/*
 * TODO: what does this do?
 *
 */
PythonToBlocks.prototype.Debugger = function() {
    return null;
}

PythonToBlocks.prototype.booleanOperator = function(op) {
    switch (op.name) {
        case "And": return "AND";
        case "Or": return "OR";
        default: throw new Error("Operator not supported:"+op.name);
    }
}

/*
 * op: boolop_ty
 * values: asdl_seq
 */
PythonToBlocks.prototype.BoolOp = function(node) {
    var op = node.op;
    var values = node.values;
    // TODO: is there ever a case where it's &lt; 1 values?
    var result_block = this.convert(values[0]);
    for (var i = 1; i &lt; values.length; i+= 1) {
        result_block = block("logic_operation", node.lineno, {
            "OP": this.booleanOperator(op)
        }, {
            "A": result_block,
            "B": this.convert(values[i])
        }, {
            "inline": "true"
        });
    }
    return result_block;
}

PythonToBlocks.prototype.binaryOperator = function(op) {
    switch (op.name) {
        case "Add": return "ADD";
        case "Sub": return "MINUS";
        case "Div": case "FloorDiv": return "DIVIDE";
        case "Mult": return "MULTIPLY";
        case "Pow": return "POWER";
        case "Mod": return "MODULO";
        default: throw new Error("Operator not supported:"+op.name);
    }
}

/*
 * left: expr_ty
 * op: operator_ty
 * right: expr_ty
 */
PythonToBlocks.prototype.BinOp = function(node)
{
    var left = node.left;
    var op = node.op;
    var right = node.right;
    return block("math_arithmetic", node.lineno, {
        "OP": this.binaryOperator(op) // TODO
    }, {
        "A": this.convert(left),
        "B": this.convert(right)
    }, {
        "inline": true
    });
}

/*
 * op: unaryop_ty
 * operand: expr_ty
 */
PythonToBlocks.prototype.UnaryOp = function(node)
{
    var op = node.op;
    var operand = node.operand;
    if (op.name == "Not") {
        return block("logic_negate", node.lineno, {}, {
            "BOOL": this.convert(operand) 
        }, {
            "inline": "false"
        });
    } else {
        throw new Error("Other unary operators are not implemented yet.");
    }
}

/*
 * args: arguments__ty
 * body: expr_ty
 */
PythonToBlocks.prototype.Lambda = function(node) {
    var args = node.args;
    var body = node.body;
    throw new Error("Lambda functions are not implemented yet.");
}

/*
 * test: expr_ty
 * body: expr_ty
 * orelse: expr_ty
 */
PythonToBlocks.prototype.IfExp = function(node)
{
    var test = node.test;
    var body = node.body;
    var orelse = node.orelse;
    throw new Error("Inline IF expressions are not implemented yet.");
}

/*
 * keys: asdl_seq
 * values: asdl_seq
 */
PythonToBlocks.prototype.Dict = function(node) {
    var keys = node.keys;
    var values = node.values;
    
    var keyList = [];
    var valueList = [];
    for (var i = 0; i &lt; keys.length; i+= 1) {
        if (keys[i]._astname != "Str") {
            throw new Error("Dictionary Keys should be Strings.");
        }
        keyList["KEY"+i] = this.Str_value(keys[i]);
        valueList["VALUE"+i] = this.convert(values[i]);
    }
    
    return block("dicts_create_with", node.lineno, keyList, valueList, {
        "inline": "false"
    }, {
        "@items": keys.length
    });
}

/*
 * elts: asdl_seq
 *
 */
PythonToBlocks.prototype.Set = function(node)
{
    var elts = node.elts;
    throw new Error("Sets are not implemented");
}

/*
 * elt: expr_ty
 * generators: asdl_seq
 */
PythonToBlocks.prototype.ListComp = function(node)
{
    var elt = node.elt;
    var generators = node.generators;
    
    // TODO
}

/*
 * elt: expr_ty
 * generators: asdl_seq
 */
PythonToBlocks.prototype.SetComp = function(node)
{
    var elt = node.elt;
    var generators = node.generators;
    throw new Error("Set Comprehensions are not implemented"); 
}

/*
 * key: expr_ty
 * value: expr_ty
 * generators: asdl_seq
 */
PythonToBlocks.prototype.DictComp = function(node)
{
    var key = node.key;
    var value = node.value;
    var generators = node.generators;
    throw new Error("Dictionary Comprehensions are not implemented"); 
}

/*
 * elt: expr_ty
 * generators: asdl_seq
 */
PythonToBlocks.prototype.GeneratorExp = function(node) {
    var elt = node.elt;
    var generators = node.generators;
    throw new Error("Generator Expresions are not implemented"); 
}

/*
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.Yield = function(node)
{
    var value = value;
    throw new Error("Yield expression is not implemented");
}


PythonToBlocks.prototype.compareOperator = function(op) {
    switch (op.name) {
        case "Eq": return "EQ";
        case "NotEq": return "NEQ";
        case "Lt": return "LT";
        case "Gt": return "GT";
        case "LtE": return "LTE";
        case "GtE": return "GTE";
        case "In_": return "IN";
        case "NotIn": return "NOTIN";
        // Is, IsNot, In, NotIn
        default: throw new Error("Operator not supported:"+op.name);
    }
}

/*
 * left: expr_ty
 * ops: asdl_int_seq
 * asdl_seq: comparators
 */
PythonToBlocks.prototype.Compare = function(node)
{
    var left = node.left;
    var ops = node.ops;
    var comparators = node.comparators;
    
    if (ops.length != 1) {
        throw new Error("Only one comparison operator is supported");
    } else if (ops[0].name == "In_" || ops[0].name == "NotIn") {
        return block("logic_isIn", node.lineno, {
            "OP": this.compareOperator(ops[0])
        }, {
            "ITEM": this.convert(left),
            "LIST": this.convert(comparators[0])
        }, {
            "inline": "true"
        });
    } else {
        return block("logic_compare", node.lineno, {
            "OP": this.compareOperator(ops[0])
        }, {
            "A": this.convert(left),
            "B": this.convert(comparators[0])
        }, {
            "inline": "true"
        });
    }
    
}

convertStockSymbols = function(symbol) {
    switch (symbol) {
        case 'FB': case "Facebook":
            return "Facebook";
        case "AAPL": case "Apple":
            return "Apple";
        case "MSFT": case "Microsoft":
            return "Microsoft";
        case "GOOG": case "Google":
            return "Google";
        default:
            throw new Error("Unknown Stock Symbol.");
    }
}

toTitleCase = function(str) {
    return str.replace(/\w\S*/g, function(txt){
        return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
    });
}
            
PythonToBlocks.KNOWN_MODULES = {
    "weather": {
        "get_temperature": ["weather_temperature", "CITY"],
        "get_report": ["weather_report", "CITY"],
        "get_forecasts": ["weather_forecasts", "CITY"],
        "get_highs_lows": ["weather_highs_lows", "CITY"],
        "get_all_forecasted_temperatures": ["weather_all_forecasts"],
        "get_forecasted_reports": ["weather_report_forecasts", "CITY"]
    }, 
    "earthquakes": {
        "get": ["earthquake_get", "PROPERTY"],
        "get_both": ["earthquake_both"],
        "get_all": ["earthquake_all"]
    },
    "stocks": {
        "get_current": ["stocks_current", ["TICKER", convertStockSymbols]],
        "get_past": ["stocks_past", ["TICKER", convertStockSymbols]]
    },
    "crime": {
        // STATE = toTitleCase
        "get_property_crimes": ["crime_state", ["STATE", toTitleCase],
                                              ["TYPE", "property"]],
        "get_violent_crimes": ["crime_state",  ["STATE", toTitleCase],
                                              ["TYPE", "violent"]],
        "get_by_year": ["crime_year", "YEAR"],
        "get_all": ["crime_all"]
    },
    "books": {
        "get_all": ["books_get"]
    },
    "plt": {
        "title": ["*plot_title", "TEXT"],
        "xlabel": ["*plot_xlabel", "TEXT"],
        "ylabel": ["*plot_ylabel", "TEXT"],
        "hist": ["*plot_hist", {"type": "variable", "mode": "value", "name": "values"}],
        "scatter": ["*plot_scatter", {"type": "variable", "mode": "value", "name": "x_values"},
                                      {"type": "variable", "mode": "value", "name": "y_values"}],
        "show": ["*plot_show"]
    }
};
PythonToBlocks.prototype.KNOWN_FUNCTIONS = ["append", "strip", "rstrip", "lstrip"];
PythonToBlocks.KNOWN_ATTR_FUNCTIONS = {};
PythonToBlocks.prototype.CallAttribute = function(func, args, keywords, starargs, kwargs, node) {
    var name = this.identifier(func.attr);
    if (func.value._astname == "Name") {
        var module = this.identifier(func.value.id);
        if (module == "plt" &amp;&amp; name == "plot") {
            if (args.length == 1) {
                return [block("plot_line", func.lineno, {}, {
                    "y_values": this.convert(args[0])
                }, {"inline": "false"})];
            } else if (args.length == 2) {
                return [block("plot_lineXY", func.lineno, {}, {
                    "x_values": this.convert(args[0]),
                    "y_values": this.convert(args[1])
                }, {"inline": "false"})];
            } else {
                throw new Error("Incorrect number of arguments to plt.plot");
            }
        } else if (module in PythonToBlocks.KNOWN_MODULES &amp;&amp; name in PythonToBlocks.KNOWN_MODULES[module]) {
            var definition = PythonToBlocks.KNOWN_MODULES[module][name];
            var blockName = definition[0];
            var isExpression = true;
            if (blockName.charAt(0) == "*") {
                blockName = blockName.slice(1);
                isExpression = false;
            }
            var fields = {};
            var mutations = {};
            var values = {};
            for (var i = 0; i &lt; args.length; i++) {
                var argument = definition[1+i];
                var destination = fields;
                if (typeof argument ==  "string") {
                    fields[argument] = this.Str_value(args[i]);
                } else if (typeof argument == "object") {
                    if (argument.mode == "value") {
                        destination = values;
                    }
                    if (argument.add_mutation !== undefined) {
                        mutations[argument.add_mutation.name] = argument.add_mutation.value;
                    }
                    if (argument.type == 'mutation') {
                        if (argument.index == undefined) {
                            mutations[argument.name] = this.Str_value(args[i]);
                        } else {
                            mutations[argument.name] = this.Str_value(args[argument.index+1]);
                        }
                    } else if (argument.type == "integer") {
                        destination[argument.name] = this.Num_value(args[i]);
                    } else if (argument.type == 'variable') {
                        destination[argument.name] = this.convert(args[i]);
                    } else if (argument.type == "integer_mapper") {
                        // Okay we jumped the shark here
                        var argumentName = argument.name;
                        var argumentMapper = argument.method;
                        destination[argumentName] = argumentMapper(this.Num_value(args[i]));
                    } else if (argument.type == 'mapper') {
                        var argumentName = argument.name;
                        var argumentMapper = argument.method;
                        destination[argumentName] = argumentMapper(this.Str_value(args[i]));
                    }
                } else {
                    var argumentName = argument[0];
                    var argumentMapper = argument[1];
                    fields[argumentName] = argumentMapper(this.Str_value(args[i]));
                }
            }
            for (var i = 1+args.length; i &lt; definition.length; i++) {
                var first = definition[i][0];
                var second = definition[i][1];
                fields[first] = second;
            }
            if (isExpression) {
                var k = block(blockName, func.lineno, fields, values, [], mutations);
                return k;
            } else {
                return [block(blockName, func.lineno, fields, values, [], mutations)];
            }
        }
    } 
    if (this.KNOWN_FUNCTIONS.indexOf(name) > -1) {
        switch (name) {
            case "append":
                if (args.length !== 1) {
                    throw new Error("Incorrect number of arguments to .append");
                }
                // Return as statement
                return [block("lists_append", func.lineno, {}, {
                    "ITEM": this.convert(args[0]),
                    "LIST": this.convert(func.value)
                }, {
                    "inline": "true"
                })];
            case "strip":
                return block("text_trim", func.lineno, { "MODE": "BOTH" }, 
                    { "TEXT": this.convert(func.value) });
            case "lstrip":
                return block("text_trim", func.lineno, { "MODE": "LEFT" }, 
                    { "TEXT": this.convert(func.value) });
            case "rstrip":
                return block("text_trim", func.lineno, { "MODE": "RIGHT" }, 
                    { "TEXT": this.convert(func.value) });
            default: throw new Error("Unknown function call!");
        }
    } else if (name in PythonToBlocks.KNOWN_ATTR_FUNCTIONS) {
        return PythonToBlocks.KNOWN_ATTR_FUNCTIONS[name].bind(this)(func, args, keywords, starargs, kwargs, node)
    } else {
        console.log(func, args, keywords, starargs, kwargs);
        heights = this.getChunkHeights(node);
        extractedSource = this.getSourceCode(arrayMin(heights), arrayMax(heights));
        var col_endoffset = node.col_endoffset;
        if (args.length > 0) {
            for (var i = 0; i &lt; args.length; i+= 1) {
                col_endoffset = args[i].col_endoffset;
            }
        } else {
            col_endoffset += 2;
            expressionCall += "()";
        }
        var expressionCall = extractedSource.slice(node.col_offset, 1+col_endoffset);
        //console.log(node, extractedSource, node.col_offset, node.col_endoffset);
        var lineno = node.lineno;
        //console.error(e);
        //return raw_expression(expressionCall, lineno);
        
        var argumentsNormal = {};
        var argumentsMutation = {"@name": name};
        for (var i = 0; i &lt; args.length; i+= 1) {
            argumentsNormal["ARG"+i] = this.convert(args[i]);
            argumentsMutation[i] = this.convert(args[i]);
        }
        var methodCall = block("procedures_callreturn", node.lineno, {
        }, argumentsNormal, {
            "inline": "false"
        }, argumentsMutation);
        
        return block("attribute_access", node.lineno, {}, {
            "MODULE": this.convert(func.value),
            "NAME": methodCall
        }, { "inline": "true"}, {});
    }
}

/*
 * func: expr_ty
 * args: asdl_seq
 * keywords: asdl_seq
 * starargs: expr_ty
 * kwargs: expr_ty
 *
 */
PythonToBlocks.prototype.Call = function(node) {
    var func = node.func;
    var args = node.args;
    var keywords = node.keywords;
    var starargs = node.starargs;
    var kwargs = node.kwargs;
    
    switch (func._astname) {
        case "Name":
            switch (this.identifier(func.id)) {
                case "print":
                    if (args.length == 1) {
                        return [block("text_print", node.lineno, {}, {
                            "TEXT": this.convert(args[0])})];
                    } else {
                        return [block("text_print_multiple", node.lineno, {}, 
                            this.convertElements("PRINT", args), 
                            {"inline": "true"
                            }, { "@items": args.length})];
                    }
                case "abs":
                    return block("math_single", node.lineno, {"OP": "ABS"}, {"NUM": this.convert(args[0])})
                case "round":
                    return block("math_round", node.lineno, {"OP": "ROUND"}, {"NUM": this.convert(args[0])})
                case "sum":
                    return block("math_on_list", node.lineno, {"OP": "SUM"}, {"LIST": this.convert(args[0])})
                case "min":
                    return block("math_on_list", node.lineno, {"OP": "MIN"}, {"LIST": this.convert(args[0])})
                case "max":
                    return block("math_on_list", node.lineno, {"OP": "MAX"}, {"LIST": this.convert(args[0])})
                case "len":
                    return block("lists_length", node.lineno, {}, {"VALUE": this.convert(args[0])})
                case "xrange":
                    return block("procedures_callreturn", node.lineno, {}, 
                        {"ARG0": this.convert(args[0])},
                        {"inline": "true"}, 
                        {"@name": "xrange",
                         "": this.convert(args[0])})
                default:
                    if (starargs !== null &amp;&amp; starargs.length > 0) {
                        throw new Error("*args (variable arguments) are not implemented yet.");
                    } else if (kwargs !== null &amp;&amp; kwargs.length > 0) {
                        throw new Error("**args (keyword arguments) are not implemented yet.");
                    }
                    var argumentsNormal = {};
                    var argumentsMutation = {"@name": this.identifier(func.id)};
                    for (var i = 0; i &lt; args.length; i+= 1) {
                        argumentsNormal["ARG"+i] = this.convert(args[i]);
                        argumentsMutation[i] = this.convert(args[i]);
                    }
                    return block("procedures_callreturn", node.lineno, {}, argumentsNormal, {
                        "inline": "false"
                    }, argumentsMutation);
            }
        // Direct function call
        case "Attribute":
        // Module function call
            return this.CallAttribute(func, args, keywords, starargs, kwargs, node);
    }
}

/*
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.Repr = function(node)
{
    var value = node.value;
    throw new Error("Repr is not yet implemented");
}

/*
 * n: object
 *
 */
PythonToBlocks.prototype.Num = function(node)
{
    var n = node.n;
    return block("math_number", node.lineno, {"NUM": Sk.ffi.remapToJs(n)});
}

PythonToBlocks.prototype.Num_value = function(node)
{
    var n = node.n;
    return Sk.ffi.remapToJs(n);
}

/*
 * s: string
 *
 */
PythonToBlocks.prototype.Str = function(node)
{
    var s = node.s;
    var strValue = Sk.ffi.remapToJs(s);
    if (strValue.split("\n").length > 1) {
        return block("string_multiline", node.lineno, {"TEXT": strValue});
    } else {
        return block("text", node.lineno, {"TEXT": strValue});
    }
}

PythonToBlocks.prototype.Str_value = function(node) {
    var s = node.s;
    return Sk.ffi.remapToJs(s);
}

/*
 * value: expr_ty
 * attr: identifier
 * ctx: expr_context_ty
 *
 */
PythonToBlocks.prototype.Attribute = function(node)
{
    var value = node.value;
    var attr = node.attr;
    var ctx = node.ctx;
    
    console.log(node);
    
    return block("attribute_access", node.lineno, {
        "MODULE": this.convert(value),
        "NAME": this.convert(attr)
    });
    
    //throw new Error("Attribute access not implemented");
}

/*
 * value: expr_ty
 * slice: slice_ty
 * ctx: expr_context_ty
 *
 */
PythonToBlocks.prototype.Subscript = function(node)
{
    var value = node.value;
    var slice = node.slice;
    var ctx = node.ctx;
    
    if (slice.value._astname == "Str") {
        return block("dict_get_literal", node.lineno, {
            "ITEM": this.Str_value(slice.value)
        }, {
            "DICT": this.convert(value)
        });
    } else if (slice.value._astname == "Num") {
        return block("lists_index", node.lineno, {}, {
            "ITEM": this.convert(slice.value),
            "LIST": this.convert(value),
        });
    }
    
    throw new Error("This kind of subscript is not supported.");
}

/*
 * id: identifier
 * ctx: expr_context_ty
 */
PythonToBlocks.prototype.Name = function(node)
{
    var id = node.id;
    var ctx = node.ctx;
    switch (this.Name_str(node)) {
        case "True":
            return block("logic_boolean", node.lineno, {"BOOL": "TRUE"});
        case "False":
            return block("logic_boolean", node.lineno, {"BOOL": "FALSE"});
        case "None":
            return block("logic_null", node.lineno);
        case "___":
            return null;
        default:
            return block('variables_get', node.lineno, {
                "VAR": this.identifier(id)
            });
    }
}

/*
 * id: identifier
 * ctx: expr_context_ty
 */
PythonToBlocks.prototype.Name_str = function(node)
{
    var id = node.id;
    var ctx = node.ctx;
    return this.identifier(id);
}

PythonToBlocks.prototype.convertElements = function(key, values) {
    var output = {};
    for (var i = 0; i &lt; values.length; i++) {
        output[key+i] = this.convert(values[i]);
    }
    return output;
}

/*
 * elts: asdl_seq
 * ctx: expr_context_ty
 *
 */
PythonToBlocks.prototype.List = function(node) {
    var elts = node.elts;
    var ctx = node.ctx;
    
    return block("lists_create_with", node.lineno, {}, 
        this.convertElements("ADD", elts)
    , {
        "inline": elts.length > 3 ? "false" : "true", 
    }, {
        "@items": elts.length
    });
}

/*
 * elts: asdl_seq
 * ctx: expr_context_ty
 */
PythonToBlocks.prototype.Tuple = function(node)
{
    var elts = node.elts;
    var ctx = node.ctx;
    
    throw new Error("Tuples not implemented");
}

/*
 *
 *
 */
PythonToBlocks.prototype.Ellipsis = function() {
    throw new Error("Ellipsis not implemented");
}

/*
 * lower: expr_ty
 * upper: expr_ty
 * step: expr_ty
 *
 */
PythonToBlocks.prototype.Slice = function(node)
{
    var lower = node.lower;
    var upper = node.upper;
    var step = node.step;
    
    throw new Error("Slices not implemented");
}

/*
 * dims: asdl_seq
 *
 */
PythonToBlocks.prototype.ExtSlice = function(node)
{
    var dims = node.dims;
    
    throw new Error("ExtSlice is not implemented.");
}

/*
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.Index = function(value)
{
    var value = node.value;
    
    throw new Error("Index is not implemented");
}

/*
 * target: expr_ty
 * iter: expr_ty
 * ifs: asdl_seq
 *
 */
PythonToBlocks.prototype.comprehension = function(node)
{
    var target = node.target;
    var iter = node.iter;
    var ifs = node.ifs;
    
    throw new Error("Comprehensions not implemented.");
}

/*
 * type: expr_ty
 * name: expr_ty
 * body: asdl_seq
 *
 */
PythonToBlocks.prototype.ExceptHandler = function(node)
{
    var type = node.type;
    var name = node.name;
    var body = node.boy;
    
    throw new Error("Except handlers are not implemented");
}

PythonToBlocks.prototype.argument_ = function(node) {
    var id = node.id;
    return this.identifier(id);
}

/*
 * args: asdl_seq
 * vararg: identifier
 * kwarg: identifier
 * defaults: asdl_seq
 *
 */
PythonToBlocks.prototype.arguments_ = function(node)
{
    var args = node.args;
    var vararg = node.vararg;
    var kwarg = node.kwarg;
    var defaults = node.defaults;
    
    var allArgs = [];
    for (var i = 0; i &lt; args.length; i++) {
        var arg = args[i];
        allArgs.push(this.argument_(arg));
    }
    return allArgs;
}

/*
 * arg: identifier
 * value: expr_ty
 *
 */
PythonToBlocks.prototype.keyword = function(node)
{
    var arg = node.arg;
    var value = node.value;
    
    throw new Error("Keywords are not implemented");
}

/*
 * name: identifier
 * asname: identifier
 *
 */
PythonToBlocks.prototype.alias = function(node)
{
    var name = node.name;
    var asname = node.asname;
    
    throw new Error("Aliases are not implemented");
}


/* ----- expr_context ----- */
/*
Load
Store
Del
AugLoad
AugStore
Param
*/


/* ----- operator ----- */
/*
Add
Sub
Mult
Div
Mod
Pow
LShift
RShift
BitOr
BitXor
BitAnd
FloorDiv
*/

/* ----- unaryop ----- */
/*
Invert
Not
UAdd
USub
*/</code></pre>
        </article>
    </section>


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