195 lines
7.2 KiB
JavaScript
195 lines
7.2 KiB
JavaScript
// type checks for all known types
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//
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// note that:
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//
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// - check by duck-typing on a property like `isUnit`, instead of checking instanceof.
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// instanceof cannot be used because that would not allow to pass data from
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// one instance of math.js to another since each has it's own instance of Unit.
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// - check the `isUnit` property via the constructor, so there will be no
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// matches for "fake" instances like plain objects with a property `isUnit`.
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// That is important for security reasons.
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// - It must not be possible to override the type checks used internally,
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// for security reasons, so these functions are not exposed in the expression
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// parser.
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import { ObjectWrappingMap } from './map.js';
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export function isNumber(x) {
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return typeof x === 'number';
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}
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export function isBigNumber(x) {
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if (!x || typeof x !== 'object' || typeof x.constructor !== 'function') {
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return false;
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}
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if (x.isBigNumber === true && typeof x.constructor.prototype === 'object' && x.constructor.prototype.isBigNumber === true) {
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return true;
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}
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if (typeof x.constructor.isDecimal === 'function' && x.constructor.isDecimal(x) === true) {
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return true;
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}
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return false;
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}
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export function isBigInt(x) {
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return typeof x === 'bigint';
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}
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export function isComplex(x) {
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return x && typeof x === 'object' && Object.getPrototypeOf(x).isComplex === true || false;
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}
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export function isFraction(x) {
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return x && typeof x === 'object' && Object.getPrototypeOf(x).isFraction === true || false;
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}
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export function isUnit(x) {
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return x && x.constructor.prototype.isUnit === true || false;
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}
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export function isString(x) {
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return typeof x === 'string';
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}
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export var isArray = Array.isArray;
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export function isMatrix(x) {
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return x && x.constructor.prototype.isMatrix === true || false;
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}
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/**
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* Test whether a value is a collection: an Array or Matrix
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* @param {*} x
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* @returns {boolean} isCollection
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*/
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export function isCollection(x) {
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return Array.isArray(x) || isMatrix(x);
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}
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export function isDenseMatrix(x) {
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return x && x.isDenseMatrix && x.constructor.prototype.isMatrix === true || false;
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}
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export function isSparseMatrix(x) {
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return x && x.isSparseMatrix && x.constructor.prototype.isMatrix === true || false;
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}
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export function isRange(x) {
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return x && x.constructor.prototype.isRange === true || false;
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}
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export function isIndex(x) {
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return x && x.constructor.prototype.isIndex === true || false;
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}
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export function isBoolean(x) {
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return typeof x === 'boolean';
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}
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export function isResultSet(x) {
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return x && x.constructor.prototype.isResultSet === true || false;
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}
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export function isHelp(x) {
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return x && x.constructor.prototype.isHelp === true || false;
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}
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export function isFunction(x) {
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return typeof x === 'function';
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}
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export function isDate(x) {
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return x instanceof Date;
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}
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export function isRegExp(x) {
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return x instanceof RegExp;
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}
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export function isObject(x) {
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return !!(x && typeof x === 'object' && x.constructor === Object && !isComplex(x) && !isFraction(x));
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}
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/**
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* Returns `true` if the passed object appears to be a Map (i.e. duck typing).
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*
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* Methods looked for are `get`, `set`, `keys` and `has`.
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*
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* @param {Map | object} object
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* @returns
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*/
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export function isMap(object) {
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// We can use the fast instanceof, or a slower duck typing check.
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// The duck typing method needs to cover enough methods to not be confused with DenseMatrix.
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if (!object) {
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return false;
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}
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return object instanceof Map || object instanceof ObjectWrappingMap || typeof object.set === 'function' && typeof object.get === 'function' && typeof object.keys === 'function' && typeof object.has === 'function';
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}
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export function isPartitionedMap(object) {
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return isMap(object) && isMap(object.a) && isMap(object.b);
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}
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export function isObjectWrappingMap(object) {
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return isMap(object) && isObject(object.wrappedObject);
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}
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export function isNull(x) {
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return x === null;
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}
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export function isUndefined(x) {
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return x === undefined;
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}
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export function isAccessorNode(x) {
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return x && x.isAccessorNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isArrayNode(x) {
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return x && x.isArrayNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isAssignmentNode(x) {
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return x && x.isAssignmentNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isBlockNode(x) {
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return x && x.isBlockNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isConditionalNode(x) {
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return x && x.isConditionalNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isConstantNode(x) {
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return x && x.isConstantNode === true && x.constructor.prototype.isNode === true || false;
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}
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/* Very specialized: returns true for those nodes which in the numerator of
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a fraction means that the division in that fraction has precedence over implicit
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multiplication, e.g. -2/3 x parses as (-2/3) x and 3/4 x parses as (3/4) x but
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6!/8 x parses as 6! / (8x). It is located here because it is shared between
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parse.js and OperatorNode.js (for parsing and printing, respectively).
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This should *not* be exported from mathjs, unlike most of the tests here.
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Its name does not start with 'is' to prevent utils/snapshot.js from thinking
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it should be exported.
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*/
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export function rule2Node(node) {
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return isConstantNode(node) || isOperatorNode(node) && node.args.length === 1 && isConstantNode(node.args[0]) && '-+~'.includes(node.op);
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}
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export function isFunctionAssignmentNode(x) {
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return x && x.isFunctionAssignmentNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isFunctionNode(x) {
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return x && x.isFunctionNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isIndexNode(x) {
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return x && x.isIndexNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isNode(x) {
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return x && x.isNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isObjectNode(x) {
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return x && x.isObjectNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isOperatorNode(x) {
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return x && x.isOperatorNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isParenthesisNode(x) {
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return x && x.isParenthesisNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isRangeNode(x) {
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return x && x.isRangeNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isRelationalNode(x) {
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return x && x.isRelationalNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isSymbolNode(x) {
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return x && x.isSymbolNode === true && x.constructor.prototype.isNode === true || false;
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}
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export function isChain(x) {
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return x && x.constructor.prototype.isChain === true || false;
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}
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export function typeOf(x) {
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var t = typeof x;
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if (t === 'object') {
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if (x === null) return 'null';
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if (isBigNumber(x)) return 'BigNumber'; // Special: weird mashup with Decimal
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if (x.constructor && x.constructor.name) return x.constructor.name;
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return 'Object'; // just in case
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}
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return t; // can be 'string', 'number', 'boolean', 'function', 'bigint', ...
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} |