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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.
*/
'use strict';
// MODULES //
var trim = require( '@stdlib/string/base/trim' );
var replace = require( '@stdlib/string/base/replace' );
var seq2multislice = require( '@stdlib/slice/base/seq2multislice' );
var getShape = require( '@stdlib/ndarray/base/shape' );
var format = require( '@stdlib/string/format' );
var isSlice = require( './is_slice_string.js' );
var isMultiSlice = require( './is_multislice_string.js' );
var isInteger = require( './is_integer_string.js' );
var isSubsequence = require( './is_subsequence_string.js' );
var isEllipsis = require( './is_ellipsis_string.js' );
var parseMultiSlice = require( './parse_multislice.js' );
var parseSlice = require( './parse_slice.js' );
var parseInteger = require( './parse_integer.js' );
// FUNCTIONS //
/**
* Parses a subsequence string.
*
* @private
* @param {string} raw - original unprocessed input string
* @param {string} str - subsequence string
* @param {NonNegativeIntegerArray} shape - array dimensions
* @param {boolean} strict - boolean indicating whether to enforce strict bounds checking
* @throws {Error} invalid slice operation
* @throws {RangeError} slice exceeds array bounds
* @returns {MultiSlice} MultiSlice object
*
* @example
* var s = parseSubsequence( ' :10 ', ':10', [ 10 ], false );
* // returns <MultiSlice>
*/
function parseSubsequence( raw, str, shape, strict ) {
var s = seq2multislice( str, shape, true );
if ( s.code ) {
if ( s.code === 'ERR_SLICE_INVALID_INCREMENT' ) {
throw new Error( format( 'invalid operation. A subsequence increment must be a non-zero integer. Value: `%s`.', raw ) );
}
if ( s.code === 'ERR_SLICE_INVALID_ELLIPSIS' ) {
throw new Error( format( 'invalid operation. A subsequence may only include a single ellipsis. Value: `%s`.', raw ) );
}
if ( s.code === 'ERR_SLICE_INVALID_SUBSEQUENCE' ) {
throw new Error( format( 'invalid operation. Unsupported slice operation. Value: `%s`.', raw ) );
}
if ( s.code === 'ERR_SLICE_TOO_MANY_DIMENSIONS' ) {
throw new RangeError( format( 'invalid operation. Number of slice dimensions does not match the number of array dimensions. Array shape: (%s). Slice dimensions: %u.', shape.join( ',' ), replace( str, /\.\.\.,/, '' ).split( ',' ).length ) );
}
// NOTE: the following error check must come last due to fall-through when in non-strict mode...
if ( s.code === 'ERR_SLICE_OUT_OF_BOUNDS' ) {
if ( strict ) {
throw new RangeError( format( 'invalid operation. Slice exceeds array bounds. Array shape: (%s).', shape.join( ',' ) ) );
}
// Repeat parsing, this time allowing for out-of-bounds slices:
s = seq2multislice( str, shape, false );
}
}
return s;
}
// MAIN //
/**
* Converts a one-dimensional ndarray indexing expression to a slice.
*
* @private
* @param {Object} target - target object
* @param {string} property - property name
* @param {boolean} strict - boolean indicating whether to enforce strict bounds checking
* @throws {Error} invalid slice operation
* @throws {RangeError} number of slice dimensions must match the number of array dimensions
* @returns {MultiSlice} multi-slice object
*/
function prop2slice( target, property, strict ) {
var prop = trim( property );
if ( isSlice( prop ) ) {
return parseSlice( property, prop );
}
if ( isMultiSlice( prop ) ) {
return parseMultiSlice( property, prop );
}
if ( isInteger( prop ) ) {
return parseInteger( property, prop );
}
if ( isSubsequence( prop ) || isEllipsis( prop ) ) {
return parseSubsequence( property, prop, getShape( target, false ), strict ); // eslint-disable-line max-len
}
// Everything else (including an empty string and undefined/non-existent properties):
return null;
}
// EXPORTS //
module.exports = prop2slice;
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