remove astwalker from remix-debug

libs/remix-debug/src/source/astWalker.js

-'use strict'
-/**
- * Crawl the given AST through the function walk(ast, callback)
- */
-function AstWalker () {} // eslint-disable-line
-
-/**
- * visit all the AST nodes
- *
- * @param {Object} ast  - AST node
- * @param {Object or Function} callback  - if (Function) the function will be called for every node.
- *                                       - if (Object) callback[<Node Type>] will be called for
- *                                         every node of type <Node Type>. callback["*"] will be called for all other nodes.
- *                                         in each case, if the callback returns false it does not descend into children.
- *                                         If no callback for the current type, children are visited.
- */
-AstWalker.prototype.walk = function (ast, callback) {
-  if (callback instanceof Function) {
-    callback = {'*': callback}
-  }
-  if (!('*' in callback)) {
-    callback['*'] = function () { return true }
-  }
-  if (ast) {
-    const nodes = ast.nodes || (ast.body && ast.body.statements) || ast.declarations || []
-    if (ast.body && ast.initializationExpression) { // 'for' loop handling
-      nodes.push(ast.initializationExpression)
-    }
-    if (manageCallBack(ast, callback) && nodes && nodes.length > 0) {
-      for (let k in nodes) {
-        const child = nodes[k]
-        this.walk(child, callback)
-      }
-    }
-  }
-}
-
-/**
- * walk the given @astList
- *
- * @param {Object} sourcesList - sources list (containing root AST node)
- * @param {Function} - callback used by AstWalker to compute response
- */
-AstWalker.prototype.walkAstList = function (sourcesList, callback) {
-  const walker = new AstWalker()
-  for (let k in sourcesList) {
-    walker.walk(sourcesList[k].ast, callback)
-  }
-}
-
-function manageCallBack (node, callback) {
-  if (node.nodeType in callback) {
-    return callback[node.nodeType](node)
-  } else {
-    return callback['*'](node)
-  }
-}
-
-module.exports = AstWalker