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* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var walk = require( 'acorn-walk' ).ancestor;
var appendUnique = require( './append_unique.js' );
var isScope = require( './is_scope.js' );
var isBlockScope = require( './is_block_scope.js' );
// MAIN //
/**
* Resolves local scopes within an abstract syntax tree (AST).
*
* ## Notes
*
* - This function modifies the provided AST by adding a `locals` property to select AST nodes and returns all resolved `locals`.
*
* @private
* @param {AST} ast - abstract syntax tree (AST)
* @throws {TypeError} must provide a program AST node
* @returns {Array} array of `Identifier` nodes of all resolved `locals` in the AST
*/
function resolveScopes( ast ) {
var declarations;
var VISITORS;
if ( ast.type !== 'Program' ) {
throw new TypeError( 'invalid argument. Must provide a program AST node.' );
}
VISITORS = {
'VariableDeclaration': VariableDeclaration,
'FunctionDeclaration': FunctionDeclaration,
'Function': declareFunction,
'ClassDeclaration': ClassDeclaration,
'TryStatement': TryStatement,
'ImportDefaultSpecifier': ModuleImportSpecifier,
'ImportSpecifier': ModuleImportSpecifier,
'ImportNamespaceSpecifier': ModuleImportSpecifier
};
declarations = [];
ast.locals = [];
walk( ast, VISITORS );
return declarations;
/**
* Resolves identifiers arising from a function declaration, such as function parameters and the function name.
*
* @private
* @param {Node} node - function declaration AST node
*/
function declareFunction( node ) {
var i;
node.locals = node.locals || [];
for ( i = 0; i < node.params.length; i++ ) {
declarationPattern( node.params[ i ], node );
}
if ( node.id ) {
appendUnique( node.locals, node.id.name );
appendUnique( declarations, node.id );
}
}
/**
* Resolves identifiers based on the variable declaration pattern.
*
* @private
* @param {Node} node - AST node
* @param {Node} parent - parent AST node
* @throws {Error} unrecognized pattern type
*/
function declarationPattern( node, parent ) {
var i;
switch ( node.type ) { // eslint-disable-line padded-blocks
// Actual identifier name:
case 'Identifier':
appendUnique( parent.locals, node.name );
appendUnique( declarations, node );
break;
// `var { a, b } = { 'a': 10, 'b': 20 }` || `var { ...o } = {}`
case 'ObjectPattern':
for ( i = 0; i < node.properties.length; i++ ) {
declarationPattern( node.properties[ i ].value || node.properties[ i ].argument, parent ); // eslint-disable-line max-len
}
break;
// `var [ x, y ] = [ 10, 20 ]`
case 'ArrayPattern':
for ( i = 0; i < node.elements.length; i++ ) {
if ( node.elements[ i ] ) {
declarationPattern( node.elements[ i ], parent );
}
}
break;
// `var [ x, y, ...z ] = [ 10, 20, 30, 40, 50 ]` || `var [ ...z ] = []`
case 'RestElement':
declarationPattern( node.argument, parent );
break;
// `var [ x=5, y=7] = [ 1 ]`
case 'AssignmentPattern':
declarationPattern( node.left, parent );
break;
default:
break;
}
}
/**
* Callback invoked upon encountering a `VariableDeclaration` AST node.
*
* @private
* @param {Node} node - AST node
* @param {Array} parents - array of parent AST nodes
*/
function VariableDeclaration( node, parents ) {
var parent;
var i;
// Case: `var x`
if ( node.kind === 'var' ) {
for ( i = parents.length-1; i >= 0; i-- ) {
if ( isScope( parents[ i ] ) ) {
parent = parents[ i ];
break;
}
}
}
// Case: `let x` || `const x`
else {
for ( i = parents.length-1; i >= 0; i-- ) {
if ( isBlockScope( parents[ i ] ) ) {
parent = parents[ i ];
break;
}
}
}
parent.locals = parent.locals || [];
for ( i = 0; i < node.declarations.length; i++ ) {
declarationPattern( node.declarations[ i ].id, parent );
}
}
/**
* Callback invoked upon encountering a `FunctionDeclaration` AST node.
*
* @private
* @param {Node} node - AST node
* @param {Array} parents - array of parent AST nodes
*/
function FunctionDeclaration( node, parents ) {
var parent;
var i;
for ( i = parents.length-2; i >= 0; i-- ) {
if ( isScope( parents[ i ] ) ) {
parent = parents[ i ];
break;
}
}
parent.locals = parent.locals || [];
if ( node.id ) {
appendUnique( parent.locals, node.id.name );
appendUnique( declarations, node.id );
}
declareFunction( node );
}
/**
* Callback invoked upon encountering a `ClassDeclaration` AST node.
*
* @private
* @param {Node} node - AST node
* @param {Array} parents - array of parent AST nodes
*/
function ClassDeclaration( node, parents ) {
var parent;
var i;
for ( i = parents.length-2; i >= 0; i-- ) {
if ( isBlockScope( parents[ i ] ) ) {
parent = parents[ i ];
break;
}
}
parent.locals = parent.locals || [];
if ( node.id ) {
appendUnique( parent.locals, node.id.name );
appendUnique( declarations, node.id );
}
}
/**
* Callback invoked upon encountering a `TryStatement` AST node.
*
* @private
* @param {Node} node - AST node
* @param {Array} parents - array of parent AST nodes
*/
function TryStatement( node ) {
if ( node.handler && node.handler.param ) {
node.handler.locals = node.handler.locals || [];
appendUnique( node.handler.locals, node.handler.param.name );
appendUnique( declarations, node.handler.param );
}
}
/**
* Callback invoked upon encountering a module `import` specifier AST node.
*
* @private
* @param {Node} node - AST node
* @param {Array} parents - array of parent AST nodes
*/
function ModuleImportSpecifier( node, parents ) {
parents[ 0 ].locals = parents[ 0 ].locals || [];
appendUnique( parents[ 0 ].locals, node.local.name );
appendUnique( declarations, node.local );
}
}
// EXPORTS //
module.exports = resolveScopes;
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