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* @license Apache-2.0
*
* Copyright (c) 2024 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.
*/
/* eslint-disable max-lines-per-function, id-length */
'use strict';
// MODULES //
var parse = require( 'acorn-loose' ).parse;
var walk = require( 'acorn-walk' );
var hasProp = require( '@stdlib/assert/has-property' );
var linkedList = require( '@stdlib/dstructs/linked-list' );
var contains = require( '@stdlib/array/base/assert/contains' );
var resolveLocalScopes = require( './resolve_local_scopes.js' );
var resolveLocalScope = require( './resolve_local_scope.js' );
var commands = require( './commands.js' );
// VARIABLES //
var COMMANDS = commands();
var isUnrecognizedKeyword = contains.factory( [ 'async', 'let' ] );
var isControlKeyword = contains.factory( [ 'if', 'else', 'switch', 'case', 'catch', 'finally', 'try', 'return', 'break', 'continue' ] );
var isUnrecognizedControlKeyword = contains.factory( [ 'await' ] );
var isSpecialIdentifier = contains.factory( [ 'this', 'super' ] );
var isReservedLiteral = contains.factory( [ 'null', 'true', 'false' ] );
var isUnrecognizedReservedLiteral = contains.factory( [ 'undefined' ] );
var isStringTokenType = contains.factory( [ 'string', 'template' ] );
var isLiteralType = contains.factory( [ 'string', 'boolean', 'number' ] );
var isReservedName = contains.factory( [ 'undefined', 'async', 'await', 'let' ] );
var RE_PUNCTUATION = /(\{|\}|\[|\]|\(|\)|,|;|:|\.|\?|\?\.|=>|\.\.\.|`|\${)/;
// MAIN //
/**
* Tokenizes the input line based on ECMAScript specification.
*
* @private
* @name tokenizer
* @type {Function}
* @param {string} line - input line
* @param {Object} context - REPL context
* @returns {Array} array of tokens
*/
function tokenizer( line, context ) {
var declarations;
var VISITORS;
var tokens = [];
var ast;
var i;
// Parse the given line into tokens & comments...
try {
ast = parse( line, {
'ecmaVersion': 'latest',
'onToken': onToken,
'onComment': onComment
});
} catch ( error ) { // eslint-disable-line no-unused-vars
return tokens;
}
// Resolve variable declarations from the given line as tokens...
declarations = resolveLocalScopes( ast );
for ( i = 0; i < declarations.length; i++ ) {
// If declaration cannot be resolved as an identifier, push it as a `name` token:
if ( !resolveIdentifier( declarations[ i ] ) ) {
tokens.push({
'value': declarations[ i ].name,
'type': 'name',
'start': declarations[ i ].start,
'end': declarations[ i ].end
});
}
}
// Resolve identifiers from the given line as tokens...
VISITORS = {
'Identifier': resolveIdentifier,
'MemberExpression': resolveMemberExpression
};
walk.simple( ast, VISITORS );
return tokens;
/**
* Callback invoked upon encountering a `Token` when parsing.
*
* @private
* @param {Object} token - token object
*/
function onToken( token ) {
// Ignore placeholders & EOF tokens:
if ( token.start >= token.end ) {
return;
}
if ( token.type.isLoop || isControlKeyword( token.type.keyword ) || ( token.type.label === 'name' && isUnrecognizedControlKeyword( token.value ) ) ) {
// Control flow keywords - `for`, `while`, `do`, `if`, `else` etc:
token.type = 'control';
tokens.push( token );
return;
}
if ( isSpecialIdentifier( token.type.keyword ) ) {
// Special identifiers - `this`, `super`:
token.type = 'specialIdentifier';
tokens.push( token );
return;
}
if ( isReservedLiteral( token.type.keyword ) ) {
// Built-in literals - `true`, `false`, `null`, `undefined`:
token.type = 'literal';
tokens.push( token );
return;
}
if ( token.type.keyword || ( token.type.label === 'name' && isUnrecognizedKeyword( token.value ) ) ) {
// Keywords - `function`, `import`, `var`, `const`, `let` etc.:
token.type = 'keyword';
tokens.push( token );
return;
}
if ( isStringTokenType( token.type.label ) ) {
// Strings and template string literals:
token.type = 'string';
tokens.push( token );
return;
}
if ( token.type.label === 'regexp' ) {
// Regex expressions:
token.type = 'regexp';
tokens.push( token );
return;
}
if ( token.type.label === 'num' ) {
// Numeric literals:
token.type = 'number';
tokens.push( token );
return;
}
if ( token.type.binop || token.type.prefix || token.type.postfix || token.type.isAssign ) { // eslint-disable-line max-len
// Operator symbols - `+`, `=`, `++` etc:
token.type = 'operator';
tokens.push( token );
return;
}
if ( RE_PUNCTUATION.test( token.type.label ) ) {
// Punctuation symbols - `,`, `(`, `;` etc:
token.value = token.type.label;
token.type = 'punctuation';
tokens.push( token );
}
}
/**
* Callback invoked upon encountering a `Comment` when parsing.
*
* @private
* @param {boolean} block - boolean indicating whether a comment is a block comment
* @param {string} text - comment value
* @param {number} start - start index
* @param {number} end - end index
*/
function onComment( block, text, start, end ) {
if ( block ) {
// TODO: add support for highlighting multi-line comments.
return;
}
tokens.push({
'type': 'comment',
'start': start,
'end': end
});
}
/**
* Resolves an `Identifier` node.
*
* @private
* @param {Object} node - AST node
* @returns {boolean} boolean indicating whether the `Identifier` was resolved
*/
function resolveIdentifier( node ) {
var identifier;
var command;
var i;
// Ignore placeholder nodes:
if ( node.start >= node.end ) {
return true;
}
// Ignore node if it is an unrecognized `keyword`:
if ( isUnrecognizedKeyword( node.name ) || isUnrecognizedControlKeyword( node.name ) ) { // eslint-disable-line max-len
return true;
}
// If node is an unrecognized `literal`, push it as a token:
if ( isUnrecognizedReservedLiteral( node.name ) ) {
tokens.push({
'value': node.name,
'type': 'literal',
'start': node.start,
'end': node.end
});
return true;
}
// If identifier is defined in the local scope, assume and treat it like a `variable` and push it as a token...
if ( contains( resolveLocalScope( ast, node ), node.name ) ) {
tokens.push({
'value': node.name,
'type': 'variable',
'start': node.start,
'end': node.end
});
return true;
}
// If identifier is a REPL command, push it as a token...
for ( i = 0; i < COMMANDS.length; i++ ) {
command = COMMANDS[ i ];
if ( node.name === command[ 0 ] ) {
tokens.push({
'value': node.name,
'type': 'command',
'start': node.start,
'end': node.end
});
return true;
}
}
// If identifier is in global context, push it as a token...
identifier = context[ node.name ];
if ( identifier ) {
if ( isLiteralType( typeof identifier ) ) {
tokens.push({
'value': node.name,
'type': 'variable',
'start': node.start,
'end': node.end
});
} else {
tokens.push({
'value': node.name,
'type': typeof identifier,
'start': node.start,
'end': node.end
});
}
return true;
}
return false;
}
/**
* Resolves a `MemberExpression` node.
*
* @private
* @param {Object} node - AST node
* @param {boolean} compute - boolean indicating whether to compute the `MemberExpression`
* @returns {(void|*)} computed value of the `MemberExpression` if compute is true
*/
function resolveMemberExpression( node, compute ) {
var properties = linkedList();
var property;
var computed;
var locals;
var obj;
// Ignore placeholder nodes:
if ( node.start >= node.end ) {
return;
}
// Resolve members of the `MemberExpression`:
resolveMembers( node );
// Check if the object identifier is valid...
property = properties.first();
if ( !property ) {
return;
}
// Ignore if the object identifier is a reserved name:
if ( isReservedName( property.value.name ) ) {
return;
}
// If object identifier exists in the local scope, don't resolve from global scope...
locals = resolveLocalScope( ast, property.value );
if ( contains( locals, property.value.name ) ) {
return;
}
// Enter object's namespace:
obj = context;
properties = properties.iterator();
obj = obj[ properties.next().value.name ];
if ( !obj ) {
// Object not defined in context:
return;
}
// Fetch properties from context:
property = properties.next();
while ( !property.done ) {
// Ignore placeholder nodes:
if ( property.value.start >= property.value.end ) {
return;
}
// Case: 'bar' in `foo['bar']` - property already pushed as a string token. Ignore...
if ( property.value.type === 'Literal' ) {
try {
if ( !hasProp( obj, property.value.value ) ) {
// Property not found in context:
break;
}
obj = obj[ property.value.value ];
} catch ( error ) { // eslint-disable-line no-unused-vars
break;
}
property = properties.next();
continue;
}
// Case: `foo.bar` - resolve property and push it as a token...
if ( property.value.type === 'Identifier' ) {
try {
if ( !hasProp( obj, property.value.name ) ) {
// Property not found in context:
break;
}
obj = obj[ property.value.name ];
} catch ( error ) { // eslint-disable-line no-unused-vars
break;
}
if ( !compute ) {
// Push token if property exists in context:
if ( isLiteralType( typeof obj ) ) {
tokens.push({
'value': property.value.name,
'type': 'variable',
'start': property.value.start,
'end': property.value.end
});
} else {
tokens.push({
'value': property.value.name,
'type': typeof obj,
'start': property.value.start,
'end': property.value.end
});
}
}
property = properties.next();
continue;
}
// Case: `foo[a.b].bar` - recursively compute the internal `MemberExpression`...
if ( property.value.type === 'MemberExpression' ) {
computed = resolveMemberExpression( property.value, true );
if ( !isLiteralType( typeof computed ) ) {
// Couldn't compute the internal `MemberExpression` into a definite name:
break;
}
try {
if ( !hasProp( obj, computed ) ) {
// Property not found in context:
break;
}
obj = obj[ computed ];
} catch ( error ) { // eslint-disable-line no-unused-vars
break;
}
property = properties.next();
continue;
}
break;
}
if ( compute ) {
return obj;
}
/**
* Resolves members of the `MemberExpression` node.
*
* @private
* @param {Object} node - node to be traversed
*/
function resolveMembers( node ) {
if ( node.object.type === 'Identifier' ) {
// Reached a resolvable MemberExpression (a.b in a.b.c.d), save property(b) & object(a) and exit:
properties.unshift( node.property );
properties.unshift( node.object );
} else if ( node.object.type === 'MemberExpression' ) {
// Found node with another MemberExpression as object, save property and traverse it:
properties.unshift( node.property );
resolveMembers( node.object );
}
}
}
}
// EXPORTS //
module.exports = tokenizer;
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