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'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]};
});
}
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