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nodes.js
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nodes.js
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'use strict';
var lib = require('./lib');
// jshint -W079
var Object = require('./object');
function traverseAndCheck(obj, type, results) {
if(obj instanceof type) {
results.push(obj);
}
if(obj instanceof Node) {
obj.findAll(type, results);
}
}
var Node = Object.extend('Node', {
init: function(lineno, colno) {
this.lineno = lineno;
this.colno = colno;
var fields = this.fields;
for(var i = 0, l = fields.length; i < l; i++) {
var field = fields[i];
// The first two args are line/col numbers, so offset by 2
var val = arguments[i + 2];
// Fields should never be undefined, but null. It makes
// testing easier to normalize values.
if(val === undefined) {
val = null;
}
this[field] = val;
}
},
findAll: function(type, results) {
results = results || [];
var i, l;
if(this instanceof NodeList) {
var children = this.children;
for(i = 0, l = children.length; i < l; i++) {
traverseAndCheck(children[i], type, results);
}
}
else {
var fields = this.fields;
for(i = 0, l = fields.length; i < l; i++) {
traverseAndCheck(this[fields[i]], type, results);
}
}
return results;
},
iterFields: function(func) {
lib.each(this.fields, function(field) {
func(this[field], field);
}, this);
}
});
// Abstract nodes
var Value = Node.extend('Value', { fields: ['value'] });
// Concrete nodes
var NodeList = Node.extend('NodeList', {
fields: ['children'],
init: function(lineno, colno, nodes) {
this.parent(lineno, colno, nodes || []);
},
addChild: function(node) {
this.children.push(node);
}
});
var Root = NodeList.extend('Root');
var Literal = Value.extend('Literal');
var Symbol = Value.extend('Symbol');
var Group = NodeList.extend('Group');
var Array = NodeList.extend('Array');
var Pair = Node.extend('Pair', { fields: ['key', 'value'] });
var Dict = NodeList.extend('Dict');
var LookupVal = Node.extend('LookupVal', { fields: ['target', 'val'] });
var If = Node.extend('If', { fields: ['cond', 'body', 'else_'] });
var IfAsync = If.extend('IfAsync');
var InlineIf = Node.extend('InlineIf', { fields: ['cond', 'body', 'else_'] });
var For = Node.extend('For', { fields: ['arr', 'name', 'body', 'else_'] });
var AsyncEach = For.extend('AsyncEach');
var AsyncAll = For.extend('AsyncAll');
var Macro = Node.extend('Macro', { fields: ['name', 'args', 'body'] });
var Caller = Macro.extend('Caller');
var Import = Node.extend('Import', { fields: ['template', 'target', 'withContext'] });
var FromImport = Node.extend('FromImport', {
fields: ['template', 'names', 'withContext'],
init: function(lineno, colno, template, names, withContext) {
this.parent(lineno, colno,
template,
names || new NodeList(), withContext);
}
});
var FunCall = Node.extend('FunCall', { fields: ['name', 'args'] });
var Filter = FunCall.extend('Filter');
var FilterAsync = Filter.extend('FilterAsync', {
fields: ['name', 'args', 'symbol']
});
var KeywordArgs = Dict.extend('KeywordArgs');
var Block = Node.extend('Block', { fields: ['name', 'body'] });
var Super = Node.extend('Super', { fields: ['blockName', 'symbol'] });
var TemplateRef = Node.extend('TemplateRef', { fields: ['template'] });
var Extends = TemplateRef.extend('Extends');
var Include = Node.extend('Include', { fields: ['template', 'ignoreMissing'] });
var Set = Node.extend('Set', { fields: ['targets', 'value'] });
var Output = NodeList.extend('Output');
var Capture = Node.extend('Capture', { fields: ['body'] });
var TemplateData = Literal.extend('TemplateData');
var UnaryOp = Node.extend('UnaryOp', { fields: ['target'] });
var BinOp = Node.extend('BinOp', { fields: ['left', 'right'] });
var In = BinOp.extend('In');
var Or = BinOp.extend('Or');
var And = BinOp.extend('And');
var Not = UnaryOp.extend('Not');
var Add = BinOp.extend('Add');
var Concat = BinOp.extend('Concat');
var Sub = BinOp.extend('Sub');
var Mul = BinOp.extend('Mul');
var Div = BinOp.extend('Div');
var FloorDiv = BinOp.extend('FloorDiv');
var Mod = BinOp.extend('Mod');
var Pow = BinOp.extend('Pow');
var Neg = UnaryOp.extend('Neg');
var Pos = UnaryOp.extend('Pos');
var Compare = Node.extend('Compare', { fields: ['expr', 'ops'] });
var CompareOperand = Node.extend('CompareOperand', {
fields: ['expr', 'type']
});
var CallExtension = Node.extend('CallExtension', {
fields: ['extName', 'prop', 'args', 'contentArgs'],
init: function(ext, prop, args, contentArgs) {
this.extName = ext._name || ext;
this.prop = prop;
this.args = args || new NodeList();
this.contentArgs = contentArgs || [];
this.autoescape = ext.autoescape;
}
});
var CallExtensionAsync = CallExtension.extend('CallExtensionAsync');
// Print the AST in a nicely formatted tree format for debuggin
function printNodes(node, indent) {
indent = indent || 0;
// This is hacky, but this is just a debugging function anyway
function print(str, indent, inline) {
var lines = str.split('\n');
for(var i=0; i<lines.length; i++) {
if(lines[i]) {
if((inline && i > 0) || !inline) {
for(var j=0; j<indent; j++) {
process.stdout.write(' ');
}
}
}
if(i === lines.length-1) {
process.stdout.write(lines[i]);
}
else {
process.stdout.write(lines[i] + '\n');
}
}
}
print(node.typename + ': ', indent);
if(node instanceof NodeList) {
print('\n');
lib.each(node.children, function(n) {
printNodes(n, indent + 2);
});
}
else if(node instanceof CallExtension) {
print(node.extName + '.' + node.prop);
print('\n');
if(node.args) {
printNodes(node.args, indent + 2);
}
if(node.contentArgs) {
lib.each(node.contentArgs, function(n) {
printNodes(n, indent + 2);
});
}
}
else {
var nodes = null;
var props = null;
node.iterFields(function(val, field) {
if(val instanceof Node) {
nodes = nodes || {};
nodes[field] = val;
}
else {
props = props || {};
props[field] = val;
}
});
if(props) {
print(JSON.stringify(props, null, 2) + '\n', null, true);
}
else {
print('\n');
}
if(nodes) {
for(var k in nodes) {
printNodes(nodes[k], indent + 2);
}
}
}
}
// var t = new NodeList(0, 0,
// [new Value(0, 0, 3),
// new Value(0, 0, 10),
// new Pair(0, 0,
// new Value(0, 0, 'key'),
// new Value(0, 0, 'value'))]);
// printNodes(t);
module.exports = {
Node: Node,
Root: Root,
NodeList: NodeList,
Value: Value,
Literal: Literal,
Symbol: Symbol,
Group: Group,
Array: Array,
Pair: Pair,
Dict: Dict,
Output: Output,
Capture: Capture,
TemplateData: TemplateData,
If: If,
IfAsync: IfAsync,
InlineIf: InlineIf,
For: For,
AsyncEach: AsyncEach,
AsyncAll: AsyncAll,
Macro: Macro,
Caller: Caller,
Import: Import,
FromImport: FromImport,
FunCall: FunCall,
Filter: Filter,
FilterAsync: FilterAsync,
KeywordArgs: KeywordArgs,
Block: Block,
Super: Super,
Extends: Extends,
Include: Include,
Set: Set,
LookupVal: LookupVal,
BinOp: BinOp,
In: In,
Or: Or,
And: And,
Not: Not,
Add: Add,
Concat: Concat,
Sub: Sub,
Mul: Mul,
Div: Div,
FloorDiv: FloorDiv,
Mod: Mod,
Pow: Pow,
Neg: Neg,
Pos: Pos,
Compare: Compare,
CompareOperand: CompareOperand,
CallExtension: CallExtension,
CallExtensionAsync: CallExtensionAsync,
printNodes: printNodes
};