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View File Name : index.js

'use strict';

var acorn = require('acorn');
var walk = require('acorn-walk');

function isScope(node) {
  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' || node.type === 'ArrowFunctionExpression' || node.type === 'Program';
}
function isBlockScope(node) {
  // The body of switch statement is a block.
  return node.type === 'BlockStatement' || node.type === 'SwitchStatement' || isScope(node);
}

function declaresArguments(node) {
  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration';
}

function reallyParse(source, options) {
  var parseOptions = Object.assign(
    {
      allowReturnOutsideFunction: true,
      allowImportExportEverywhere: true,
      allowHashBang: true,
      ecmaVersion: "latest"
    },
    options
  );
  return acorn.parse(source, parseOptions);
}
module.exports = findGlobals;
module.exports.parse = reallyParse;
function findGlobals(source, options) {
  options = options || {};
  var globals = [];
  var ast;
  // istanbul ignore else
  if (typeof source === 'string') {
    ast = reallyParse(source, options);
  } else {
    ast = source;
  }
  // istanbul ignore if
  if (!(ast && typeof ast === 'object' && ast.type === 'Program')) {
    throw new TypeError('Source must be either a string of JavaScript or an acorn AST');
  }
  var declareFunction = function (node) {
    var fn = node;
    fn.locals = fn.locals || Object.create(null);
    node.params.forEach(function (node) {
      declarePattern(node, fn);
    });
    if (node.id) {
      fn.locals[node.id.name] = true;
    }
  };
  var declareClass = function (node) {
    node.locals = node.locals || Object.create(null);
    if (node.id) {
      node.locals[node.id.name] = true;
    }
  };
  var declarePattern = function (node, parent) {
    switch (node.type) {
      case 'Identifier':
        parent.locals[node.name] = true;
        break;
      case 'ObjectPattern':
        node.properties.forEach(function (node) {
          declarePattern(node.value || node.argument, parent);
        });
        break;
      case 'ArrayPattern':
        node.elements.forEach(function (node) {
          if (node) declarePattern(node, parent);
        });
        break;
      case 'RestElement':
        declarePattern(node.argument, parent);
        break;
      case 'AssignmentPattern':
        declarePattern(node.left, parent);
        break;
      // istanbul ignore next
      default:
        throw new Error('Unrecognized pattern type: ' + node.type);
    }
  };
  var declareModuleSpecifier = function (node, parents) {
    ast.locals = ast.locals || Object.create(null);
    ast.locals[node.local.name] = true;
  };
  walk.ancestor(ast, {
    'VariableDeclaration': function (node, parents) {
      var parent = null;
      for (var i = parents.length - 1; i >= 0 && parent === null; i--) {
        if (node.kind === 'var' ? isScope(parents[i]) : isBlockScope(parents[i])) {
          parent = parents[i];
        }
      }
      parent.locals = parent.locals || Object.create(null);
      node.declarations.forEach(function (declaration) {
        declarePattern(declaration.id, parent);
      });
    },
    'FunctionDeclaration': function (node, parents) {
      var parent = null;
      for (var i = parents.length - 2; i >= 0 && parent === null; i--) {
        if (isScope(parents[i])) {
          parent = parents[i];
        }
      }
      parent.locals = parent.locals || Object.create(null);
      if (node.id) {
        parent.locals[node.id.name] = true;
      }
      declareFunction(node);
    },
    'Function': declareFunction,
    'ClassDeclaration': function (node, parents) {
      var parent = null;
      for (var i = parents.length - 2; i >= 0 && parent === null; i--) {
        if (isBlockScope(parents[i])) {
          parent = parents[i];
        }
      }
      parent.locals = parent.locals || Object.create(null);
      if (node.id) {
        parent.locals[node.id.name] = true;
      }
      declareClass(node);
    },
    'Class': declareClass,
    'TryStatement': function (node) {
      if (node.handler === null || node.handler.param === null) return;
      node.handler.locals = node.handler.locals || Object.create(null);
      declarePattern(node.handler.param, node.handler);
    },
    'ImportDefaultSpecifier': declareModuleSpecifier,
    'ImportSpecifier': declareModuleSpecifier,
    'ImportNamespaceSpecifier': declareModuleSpecifier
  });
  function identifier(node, parents) {
    var name = node.name;
    if (name === 'undefined') return;
    for (var i = 0; i < parents.length; i++) {
      if (name === 'arguments' && declaresArguments(parents[i])) {
        return;
      }
      if (parents[i].locals && name in parents[i].locals) {
        return;
      }
    }
    node.parents = parents.slice();
    globals.push(node);
  }
  walk.ancestor(ast, {
    'VariablePattern': identifier,
    'Identifier': identifier,
    'ThisExpression': function (node, parents) {
      for (var i = 0; i < parents.length; i++) {
        var parent = parents[i];
        if ( parent.type === 'FunctionExpression' || parent.type === 'FunctionDeclaration' ) { return; }
        if ( parent.type === 'PropertyDefinition' && parents[i+1]===parent.value ) { return; }
      }
      node.parents = parents.slice();
      globals.push(node);
    }
  });
  var groupedGlobals = Object.create(null);
  globals.forEach(function (node) {
    var name = node.type === 'ThisExpression' ? 'this' : node.name;
    groupedGlobals[name] = (groupedGlobals[name] || []);
    groupedGlobals[name].push(node);
  });
  return Object.keys(groupedGlobals).sort().map(function (name) {
    return {name: name, nodes: groupedGlobals[name]};
  });
}