86 lines
2.5 KiB
JavaScript
86 lines
2.5 KiB
JavaScript
import { isFunctionAssignmentNode, isSymbolNode } from '../../utils/is.js';
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import { maxArgumentCount } from '../../utils/function.js';
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import { map } from '../../utils/array.js';
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import { factory } from '../../utils/factory.js';
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import { compileInlineExpression } from './utils/compileInlineExpression.js';
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var name = 'map';
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var dependencies = ['typed'];
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export var createMapTransform = /* #__PURE__ */factory(name, dependencies, _ref => {
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var {
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typed
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} = _ref;
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/**
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* Attach a transform function to math.map
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* Adds a property transform containing the transform function.
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*
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* This transform creates a one-based index instead of a zero-based index
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*/
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function mapTransform(args, math, scope) {
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var x, callback;
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if (args[0]) {
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x = args[0].compile().evaluate(scope);
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}
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if (args[1]) {
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if (isSymbolNode(args[1]) || isFunctionAssignmentNode(args[1])) {
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// a function pointer, like filter([3, -2, 5], myTestFunction)
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callback = args[1].compile().evaluate(scope);
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} else {
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// an expression like filter([3, -2, 5], x > 0)
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callback = compileInlineExpression(args[1], math, scope);
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}
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}
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return map(x, callback);
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}
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mapTransform.rawArgs = true; // one-based version of map function
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var map = typed('map', {
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'Array, function': function ArrayFunction(x, callback) {
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return _map(x, callback, x);
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},
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'Matrix, function': function MatrixFunction(x, callback) {
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return x.create(_map(x.valueOf(), callback, x));
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}
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});
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return mapTransform;
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}, {
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isTransformFunction: true
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});
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/**
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* Map for a multi dimensional array. One-based indexes
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* @param {Array} array
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* @param {function} callback
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* @param {Array} orig
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* @return {Array}
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* @private
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*/
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function _map(array, callback, orig) {
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// figure out what number of arguments the callback function expects
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var argsCount = maxArgumentCount(callback);
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function recurse(value, index) {
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if (Array.isArray(value)) {
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return map(value, function (child, i) {
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// we create a copy of the index array and append the new index value
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return recurse(child, index.concat(i + 1)); // one based index, hence i + 1
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});
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} else {
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// invoke the (typed) callback function with the right number of arguments
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if (argsCount === 1) {
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return callback(value);
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} else if (argsCount === 2) {
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return callback(value, index);
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} else {
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// 3 or -1
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return callback(value, index, orig);
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}
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}
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}
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return recurse(array, []);
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} |