Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 127x 11x 11x 11x 11x 11x | /**
* @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.
*/
/* eslint-disable no-underscore-dangle */
'use strict';
// MODULES //
var logger = require( 'debug' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var propertyDescriptor = require( '@stdlib/utils/property-descriptor' );
var format = require( '@stdlib/string/format' );
// VARIABLES //
var debug = logger( 'repl:command:is_keyword' );
// MAIN //
/**
* Returns a callback to be invoked upon calling the `isKeyword` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
return onCommand;
/**
* Returns a boolean indicating whether a string is a reserved keyword in the REPL environment.
*
* ## Notes
*
* - This function supports nested keyword paths (e.g., `base.sin`).
*
* @private
* @param {string} keyword - string to test
* @returns {(boolean|void)} boolean indicating whether a string is a reserved keyword
*/
function onCommand( keyword ) {
var desc;
var err;
var o;
var i;
var k;
if ( !isString( keyword ) ) {
err = new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', keyword ) );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
// Our proxy for determining whether a value is a keyword is whether the value is read-only property on the `context` object, as any properties we have added to the `context` object are read-only (note, however, that, in a non-sandboxed environment, the `global` object may have read-only properties we have *not* introduced; meaning, some values which may be flagged as "keywords" were not introduced by us):
keyword = keyword.split( '.' );
o = repl._context;
for ( i = 0; i < keyword.length-1; i++ ) {
k = keyword[ i ];
if ( !hasOwnProp( o, k ) ) {
return false;
}
o = o[ k ];
}
k = keyword[ i ];
desc = propertyDescriptor( o, k );
return (
desc !== null &&
(
// Data descriptor:
desc.writable === false ||
// Accessor descriptor:
(
typeof desc.get === 'function' &&
desc.set === void 0
)
)
);
}
}
// EXPORTS //
module.exports = command;
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