Script Pattern Factory

A simple tool for creating AST signatures from raw strings. The tool is developed to find patterns in code, but it can be used for any purpose

API

SPF.parse (source, opts)

Traverse source code and returns its AST pattern

• source (string)
• opts (object) - optional
  • input (object)
    • minify (boolean/opts) uglify-js minify configuration. if true the source will be minified using the default configuration (UglifyJS.minify(code);)
  • parse (object) meriyah parsing API
  • output (object)
    • raw (boolean) return raw nodes
    • compressed(boolean) return compressed pattern (e.g VVVVV -> V5)
    • map (object) override AST nodes mapping

SPF.inspect()

returns the AST nodes mapping

AST Nodes Mapping

 {
	  Program: '',
	  FunctionDeclaration: 'F',
	  VariableDeclaration: 'V',
	  VariableDeclarator: 'v',
	  BlockStatement: 'B',
	  Identifier: 'I',
	  ExpressionStatement: 'E',
	  CallExpression: 'C',
	  ThisExpression: 'd',
	  Literal: 'e',
	  EmptyStatement: 'h',
	  DebuggerStatement: 'i',
	  WithStatement: 'j',
	  ReturnStatement: 'k',
	  LabeledStatement: 'l',
	  BreakStatement: 'm',
	  ContinueStatement: 'n',
	  IfStatement: 'o',
	  SwitchStatement: 'p',
	  SwitchCase: 'q',
	  ThrowStatement: 'r',
	  TryStatement: 's',
	  CatchClause: 't',
	  WhileStatement: 'u',
	  DoWhileStatement: 'c',
	  ForStatement: 'w',
	  ForInStatement: 'x',
	  Property: 'z',
	  ArrayExpression: 'A',
	  ObjectExpression: 'b',
	  FunctionExpression: 'P',
	  UnaryExpression: 'D',
	  UnaryOperator: 'g',
	  UpdateExpression: 'a',
	  UpdateOperator: 'G',
	  BinaryExpression: 'H',
	  BinaryOperator: 'f',
	  AssignmentExpression: 'J',
	  AssignmentOperator: 'K',
	  LogicalExpression: 'L',
	  LogicalOperator: 'M',
	  MemberExpression: 'N',
	  ConditionalExpression: 'O',
	  NewExpression: 'Q',
	  SequenceExpression: 'R',
}

Example - SPF.parse

const SPF = require('script-pattern-factory');

(async function () {
   const code = `
   const x = 10;
   function foo(val){
       console.log(val);
   }
   foo(x);
   
   const y = 55;
   `;
   const pattern = await SPF.getPattern(code);
   //VveIFIBECNIIIIECIIVveI
   console.log(`Pattern ${pattern}`);
   console.log(`Symbol Map:\n${JSON.stringify(SPF.inspect())}`);
})();

SPF.getNodes (source, opts)

Traverse source code and returns its AST, complete with the code for each node.

• source (string)
• parse (object) meriyah parsing API. Note the location (loc) option is on by default and is required to extract the actual code for each node.

Example - SPF.getNodes

const SPF = require('script-pattern-factory');

(async function () {
   const code = `
   const x = 10;
   function foo(val){
       console.log(val);
   }
   foo(x);
   ;
   const y = 55;
   `;
   const nodes = await SPF.getNodes(code);
   console.log(`Parsed ${nodes.length}:`);
   for (let node of nodes) {
       console.log(`[${node.type.padEnd(19)}] ==> ${node.src.replace('\n', '')}`);
   }
})();