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nodes.js
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nodes.js
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'use strict';
const {Obj} = require('./object');
function traverseAndCheck(obj, type, results) {
if (obj instanceof type) {
results.push(obj);
}
if (obj instanceof Node) {
obj.findAll(type, results);
}
}
class Node extends Obj {
init(lineno, colno, ...args) {
this.lineno = lineno;
this.colno = colno;
this.fields.forEach((field, 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(type, results) {
results = results || [];
if (this instanceof NodeList) {
this.children.forEach(child => traverseAndCheck(child, type, results));
} else {
this.fields.forEach(field => traverseAndCheck(this[field], type, results));
}
return results;
}
iterFields(func) {
this.fields.forEach((field) => {
func(this[field], field);
});
}
}
// Abstract nodes
class Value extends Node {
get typename() { return 'Value'; }
get fields() {
return ['value'];
}
}
// Concrete nodes
class NodeList extends Node {
get typename() { return 'NodeList'; }
get fields() { return ['children']; }
init(lineno, colno, nodes) {
super.init(lineno, colno, nodes || []);
}
addChild(node) {
this.children.push(node);
}
}
const Root = NodeList.extend('Root');
const Literal = Value.extend('Literal');
const Symbol = Value.extend('Symbol');
const Group = NodeList.extend('Group');
const ArrayNode = NodeList.extend('Array');
const Pair = Node.extend('Pair', { fields: ['key', 'value'] });
const Dict = NodeList.extend('Dict');
const LookupVal = Node.extend('LookupVal', { fields: ['target', 'val'] });
const If = Node.extend('If', { fields: ['cond', 'body', 'else_'] });
const IfAsync = If.extend('IfAsync');
const InlineIf = Node.extend('InlineIf', { fields: ['cond', 'body', 'else_'] });
const For = Node.extend('For', { fields: ['arr', 'name', 'body', 'else_'] });
const AsyncEach = For.extend('AsyncEach');
const AsyncAll = For.extend('AsyncAll');
const Macro = Node.extend('Macro', { fields: ['name', 'args', 'body'] });
const Caller = Macro.extend('Caller');
const Import = Node.extend('Import', { fields: ['template', 'target', 'withContext'] });
class FromImport extends Node {
get typename() { return 'FromImport'; }
get fields() { return ['template', 'names', 'withContext']; }
init(lineno, colno, template, names, withContext) {
super.init(lineno, colno, template, names || new NodeList(), withContext);
}
}
const FunCall = Node.extend('FunCall', { fields: ['name', 'args'] });
const Filter = FunCall.extend('Filter');
const FilterAsync = Filter.extend('FilterAsync', { fields: ['name', 'args', 'symbol'] });
const KeywordArgs = Dict.extend('KeywordArgs');
const Block = Node.extend('Block', { fields: ['name', 'body'] });
const Super = Node.extend('Super', { fields: ['blockName', 'symbol'] });
const TemplateRef = Node.extend('TemplateRef', { fields: ['template'] });
const Extends = TemplateRef.extend('Extends');
const Include = Node.extend('Include', { fields: ['template', 'ignoreMissing'] });
const Set = Node.extend('Set', { fields: ['targets', 'value'] });
const Switch = Node.extend('Switch', { fields: ['expr', 'cases', 'default'] });
const Case = Node.extend('Case', { fields: ['cond', 'body'] });
const Output = NodeList.extend('Output');
const Capture = Node.extend('Capture', { fields: ['body'] });
const TemplateData = Literal.extend('TemplateData');
const UnaryOp = Node.extend('UnaryOp', { fields: ['target'] });
const BinOp = Node.extend('BinOp', { fields: ['left', 'right'] });
const In = BinOp.extend('In');
const Is = BinOp.extend('Is');
const Or = BinOp.extend('Or');
const And = BinOp.extend('And');
const Not = UnaryOp.extend('Not');
const Add = BinOp.extend('Add');
const Concat = BinOp.extend('Concat');
const Sub = BinOp.extend('Sub');
const Mul = BinOp.extend('Mul');
const Div = BinOp.extend('Div');
const FloorDiv = BinOp.extend('FloorDiv');
const Mod = BinOp.extend('Mod');
const Pow = BinOp.extend('Pow');
const Neg = UnaryOp.extend('Neg');
const Pos = UnaryOp.extend('Pos');
const Compare = Node.extend('Compare', { fields: ['expr', 'ops'] });
const CompareOperand = Node.extend('CompareOperand', { fields: ['expr', 'type'] });
const CallExtension = Node.extend('CallExtension', {
init(ext, prop, args, contentArgs) {
this.parent();
this.extName = ext.__name || ext;
this.prop = prop;
this.args = args || new NodeList();
this.contentArgs = contentArgs || [];
this.autoescape = ext.autoescape;
},
fields: ['extName', 'prop', 'args', 'contentArgs']
});
const CallExtensionAsync = CallExtension.extend('CallExtensionAsync');
// This is hacky, but this is just a debugging function anyway
function print(str, indent, inline) {
var lines = str.split('\n');
lines.forEach((line, i) => {
if (line && ((inline && i > 0) || !inline)) {
process.stdout.write((' ').repeat(indent));
}
const nl = (i === lines.length - 1) ? '' : '\n';
process.stdout.write(`${line}${nl}`);
});
}
// Print the AST in a nicely formatted tree format for debuggin
function printNodes(node, indent) {
indent = indent || 0;
print(node.typename + ': ', indent);
if (node instanceof NodeList) {
print('\n');
node.children.forEach((n) => {
printNodes(n, indent + 2);
});
} else if (node instanceof CallExtension) {
print(`${node.extName}.${node.prop}\n`);
if (node.args) {
printNodes(node.args, indent + 2);
}
if (node.contentArgs) {
node.contentArgs.forEach((n) => {
printNodes(n, indent + 2);
});
}
} else {
let nodes = [];
let props = null;
node.iterFields((val, fieldName) => {
if (val instanceof Node) {
nodes.push([fieldName, val]);
} else {
props = props || {};
props[fieldName] = val;
}
});
if (props) {
print(JSON.stringify(props, null, 2) + '\n', null, true);
} else {
print('\n');
}
nodes.forEach(([fieldName, n]) => {
print(`[${fieldName}] =>`, indent + 2);
printNodes(n, indent + 4);
});
}
}
module.exports = {
Node: Node,
Root: Root,
NodeList: NodeList,
Value: Value,
Literal: Literal,
Symbol: Symbol,
Group: Group,
Array: ArrayNode,
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,
Switch: Switch,
Case: Case,
LookupVal: LookupVal,
BinOp: BinOp,
In: In,
Is: Is,
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
};