Finished expr-eval testing
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5 changed files with 260 additions and 132 deletions
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@ -111,7 +111,7 @@ function simplify(tokens, unaryOps, binaryOps, ternaryOps, values) {
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* In the given instructions, replaces variable by expr.
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* @param {Instruction[]} tokens
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* @param {string} variable
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* @param {number} expr
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* @param {ExprEvalExpression} expr
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* @return {Instruction[]}
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*/
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function substitute(tokens, variable, expr) {
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@ -487,18 +487,6 @@ export class ExprEvalExpression {
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return evaluate(this.tokens, this, values)
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}
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/**
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* Returns a list of symbols (string of characters) in the expressions.
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* Can be functions, constants, or variables.
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* @returns {string[]}
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*/
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symbols(options) {
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options = options || {}
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const vars = []
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getSymbols(this.tokens, vars, options)
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return vars
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}
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toString() {
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return expressionToString(this.tokens, false)
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}
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@ -120,18 +120,13 @@ export class Parser {
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min: Polyfill.min,
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max: Polyfill.max,
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hypot: Math.hypot || Polyfill.hypot,
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pyt: Math.hypot || Polyfill.hypot, // backward compat
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pyt: Math.hypot || Polyfill.hypot,
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pow: Math.pow,
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atan2: Math.atan2,
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"if": Polyfill.condition,
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gamma: Polyfill.gamma,
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"Γ": Polyfill.gamma,
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roundTo: Polyfill.roundTo,
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map: Polyfill.arrayMap,
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fold: Polyfill.arrayFold,
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filter: Polyfill.arrayFilter,
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indexOf: Polyfill.stringOrArrayIndexOf,
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join: Polyfill.arrayJoin
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}
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// These constants will automatically be replaced the MOMENT they are parsed.
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@ -156,10 +151,6 @@ export class Parser {
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return new ExprEvalExpression(instr, this)
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}
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evaluate(expr, variables) {
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return this.parse(expr).evaluate(variables)
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}
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isOperatorEnabled(op) {
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const optionName = optionNameMap.hasOwnProperty(op) ? optionNameMap[op] : op
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const operators = this.options.operators || {}
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@ -210,9 +210,8 @@ export function gamma(n) {
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}
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export function stringOrArrayLength(s) {
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if(Array.isArray(s)) {
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if(Array.isArray(s))
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return s.length
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}
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return String(s).length
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}
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@ -296,58 +295,6 @@ export function min(array) {
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}
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}
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export function arrayMap(f, a) {
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if(typeof f !== "function") {
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throw new EvalError(qsTranslate("error", "First argument to map is not a function."))
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}
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if(!Array.isArray(a)) {
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throw new EvalError(qsTranslate("error", "Second argument to map is not an array."))
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}
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return a.map(function(x, i) {
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return f(x, i)
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})
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}
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export function arrayFold(f, init, a) {
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if(typeof f !== "function") {
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throw new EvalError(qsTranslate("error", "First argument to fold is not a function."))
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}
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if(!Array.isArray(a)) {
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throw new EvalError(qsTranslate("error", "Second argument to fold is not an array."))
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}
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return a.reduce(function(acc, x, i) {
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return f(acc, x, i)
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}, init)
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}
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export function arrayFilter(f, a) {
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if(typeof f !== "function") {
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throw new EvalError(qsTranslate("error", "First argument to filter is not a function."))
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}
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if(!Array.isArray(a)) {
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throw new EvalError(qsTranslate("error", "Second argument to filter is not an array."))
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}
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return a.filter(function(x, i) {
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return f(x, i)
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})
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}
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export function stringOrArrayIndexOf(target, s) {
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if(!(Array.isArray(s) || typeof s === "string")) {
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throw new Error(qsTranslate("error", "Second argument to indexOf is not a string or array."))
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}
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return s.indexOf(target)
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}
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export function arrayJoin(sep, a) {
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if(!Array.isArray(a)) {
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throw new Error(qsTranslate("error", "Second argument to join is not an array."))
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}
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return a.join(sep)
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}
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export function sign(x) {
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return ((x > 0) - (x < 0)) || +x
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}
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@ -19,7 +19,7 @@
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import { Module } from "./common.mjs"
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import { Parser } from "../lib/expr-eval/parser.mjs"
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const evalVariables = {
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const EVAL_VARIABLES = {
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// Variables not provided by expr-eval.js, needs to be provided manually
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"pi": Math.PI,
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"PI": Math.PI,
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@ -42,7 +42,7 @@ class ExprParserAPI extends Module {
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this.currentVars = {}
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this.#parser = new Parser()
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this.#parser.consts = Object.assign({}, this.#parser.consts, evalVariables)
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this.#parser.consts = Object.assign({}, this.#parser.consts, EVAL_VARIABLES)
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this.#parser.functions.integral = this.integral.bind(this)
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this.#parser.functions.derivative = this.derivative.bind(this)
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@ -25,72 +25,274 @@ import { expect } from "chai"
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import ExprEval from "../../src/module/expreval.mjs"
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describe("Module/ExprEval", function() {
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describe("#parse", function() {
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const evaluate = (expr, vals) => ExprEval.parse(expr).evaluate(vals)
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describe("#parse.evaluate", function() {
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const evaluate = (expr, vals = {}) => ExprEval.parse(expr).evaluate(vals)
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it("parses simple mathematical expressions", function() {
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expect(evaluate("1", {})).to.equal(1)
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expect(evaluate("-1", {})).to.equal(-1)
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expect(evaluate("-(-1)", {})).to.equal(1)
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expect(evaluate("+(-1)", {})).to.equal(-1)
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expect(evaluate("3!", {})).to.equal(6)
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expect(evaluate("1+1", {})).to.equal(2)
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expect(evaluate("4*3", {})).to.equal(12)
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expect(evaluate("64/4", {})).to.equal(16)
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expect(evaluate("2^10", {})).to.equal(1024)
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expect(evaluate("10%3", {})).to.equal(1)
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expect(evaluate("10%3", {})).to.equal(1)
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expect(evaluate(`"\\'\\"\\\\\\/\\b\\f\\n\\r\\t\\u3509"`)).to.equal(`'"\\/\b\f\n\r\t\u3509`)
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expect(evaluate("1")).to.equal(1)
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expect(evaluate(" 1 ")).to.equal(1)
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expect(evaluate("0xFF")).to.equal(255)
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expect(evaluate("0b11")).to.equal(3)
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expect(evaluate("-1")).to.equal(-1)
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expect(evaluate("-(-1)")).to.equal(1)
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expect(evaluate("+(-1)")).to.equal(-1)
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expect(evaluate("3!")).to.equal(6)
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expect(evaluate("1+1")).to.equal(2)
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expect(evaluate("4*3")).to.equal(12)
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expect(evaluate("4•3")).to.equal(12)
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expect(evaluate("64/4")).to.equal(16)
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expect(evaluate("2^10")).to.equal(1024)
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expect(evaluate("10%3")).to.equal(1)
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expect(evaluate("10%3")).to.equal(1)
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// Test priorities
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expect(evaluate("10*10+10*10", {})).to.equal(200)
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expect(evaluate("10/10+10/10", {})).to.equal(2)
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expect(evaluate("10/10+10/10", {})).to.equal(2)
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expect(evaluate("2^2-2^2", {})).to.equal(0)
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expect(evaluate("(2^2-2)^2", {})).to.equal(4)
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expect(evaluate("10*10+10*10")).to.equal(200)
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expect(evaluate("10/10+10/10")).to.equal(2)
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expect(evaluate("10/10+10/10")).to.equal(2)
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expect(evaluate("2^2-2^2")).to.equal(0)
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expect(evaluate("(2^2-2)^2")).to.equal(4)
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})
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it("parses equality and test statements", function() {
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expect(evaluate("10%3 == 1 ? 2 : 1", {})).to.equal(2)
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expect(evaluate("10%3 != 1 ? 2 : 1", {})).to.equal(1)
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expect(evaluate("10 < 3 ? 2 : 1", {})).to.equal(1)
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expect(evaluate("10 > 3 ? (2+1) : 1", {})).to.equal(3)
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expect(evaluate("10 <= 3 ? 4 : 1", {})).to.equal(1)
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expect(evaluate("10 >= 3 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10%3 == 1 ? 2 : 1")).to.equal(2)
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expect(evaluate("not(10%3 == 1) ? 2 : 1")).to.equal(1)
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expect(evaluate("10%3 != 1 ? 2 : 1")).to.equal(1)
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expect(evaluate("10 < 3 ? 2 : 1")).to.equal(1)
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expect(evaluate("10 > 3 ? (2+1) : 1")).to.equal(3)
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expect(evaluate("10 <= 3 ? 4 : 1")).to.equal(1)
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expect(evaluate("10 >= 3 ? 4 : 1")).to.equal(4)
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// Check equality
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expect(evaluate("10 < 10 ? 2 : 1", {})).to.equal(1)
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expect(evaluate("10 > 10 ? 2 : 1", {})).to.equal(1)
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expect(evaluate("10 <= 10 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10 >= 10 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10 < 10 ? 2 : 1")).to.equal(1)
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expect(evaluate("10 > 10 ? 2 : 1")).to.equal(1)
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expect(evaluate("10 <= 10 ? 4 : 1")).to.equal(4)
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expect(evaluate("10 >= 10 ? 4 : 1")).to.equal(4)
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// Check 'and' and 'or'
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expect(evaluate("10 <= 3 and 10 < 10 ? 4 : 1", {})).to.equal(1)
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expect(evaluate("10 <= 10 and 10 < 10 ? 4 : 1", {})).to.equal(1)
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expect(evaluate("10 <= 10 and 10 < 20 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10 <= 3 or 10 < 10 ? 4 : 1", {})).to.equal(1)
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expect(evaluate("10 <= 10 or 10 < 10 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10 <= 10 or 10 < 20 ? 4 : 1", {})).to.equal(4)
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expect(evaluate("10 <= 3 and 10 < 10 ? 4 : 1")).to.equal(1)
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expect(evaluate("10 <= 10 and 10 < 10 ? 4 : 1")).to.equal(1)
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expect(evaluate("10 <= 10 and 10 < 20 ? 4 : 1")).to.equal(4)
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expect(evaluate("10 <= 3 or 10 < 10 ? 4 : 1")).to.equal(1)
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expect(evaluate("10 <= 10 or 10 < 10 ? 4 : 1")).to.equal(4)
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expect(evaluate("10 <= 10 or 10 < 20 ? 4 : 1")).to.equal(4)
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})
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it("parses singular function operators (functions with one arguments and no parenthesis)", function() {
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// Trigonometric functions
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expect(evaluate("sin π", { })).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("cos π", { })).to.be.approximately(-1, Number.EPSILON)
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expect(evaluate("tan π", { })).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("asin 1", { })).to.be.approximately(Math.PI/2, Number.EPSILON)
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expect(evaluate("acos 1", { })).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("atan 1", { })).to.be.approximately(Math.PI/4, Number.EPSILON)
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expect(evaluate("sinh 1", { })).to.be.approximately(Math.sinh(1), Number.EPSILON)
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expect(evaluate("cosh 1", { })).to.be.approximately(Math.cosh(1), Number.EPSILON)
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expect(evaluate("tanh 1", { })).to.be.approximately(Math.tanh(1), Number.EPSILON)
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expect(evaluate("asinh 1", { })).to.be.approximately(Math.asinh(1), Number.EPSILON)
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expect(evaluate("acosh 1", { })).to.be.approximately(Math.acosh(1), Number.EPSILON)
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expect(evaluate("atanh 0.5", { })).to.be.approximately(Math.atanh(0.5), Number.EPSILON)
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expect(evaluate("sin 0")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("cos 0")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("tan 0")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("asin 1")).to.be.approximately(Math.PI / 2, Number.EPSILON)
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expect(evaluate("acos 1")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("atan 1")).to.be.approximately(Math.PI / 4, Number.EPSILON)
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expect(evaluate("sinh 1")).to.be.approximately(Math.sinh(1), Number.EPSILON)
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expect(evaluate("cosh 1")).to.be.approximately(Math.cosh(1), Number.EPSILON)
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expect(evaluate("tanh 1")).to.be.approximately(Math.tanh(1), Number.EPSILON)
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expect(evaluate("asinh 1")).to.be.approximately(Math.asinh(1), Number.EPSILON)
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expect(evaluate("acosh 1")).to.be.approximately(Math.acosh(1), Number.EPSILON)
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expect(evaluate("atanh 0.5")).to.be.approximately(Math.atanh(0.5), Number.EPSILON)
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// Reverse trigonometric
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expect(evaluate("asin sin 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("acos cos 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("atan tan 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("asinh sinh 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("acosh cosh 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("atanh tanh 1", { })).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("asin sin 1")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("acos cos 1")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("atan tan 1")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("asinh sinh 1")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("acosh cosh 1")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("atanh tanh 1")).to.be.approximately(1, Number.EPSILON)
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// Other functions
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expect(evaluate("sqrt 4")).to.be.approximately(2, Number.EPSILON)
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expect(evaluate("sqrt 2")).to.be.approximately(Math.sqrt(2), Number.EPSILON)
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expect(evaluate("cbrt 27")).to.be.approximately(3, Number.EPSILON)
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expect(evaluate("cbrt 14")).to.be.approximately(Math.cbrt(14), Number.EPSILON)
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expect(evaluate("log 1")).to.be.approximately(Math.log(1), Number.EPSILON)
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expect(evaluate("ln 1")).to.be.approximately(Math.log(1), Number.EPSILON)
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expect(evaluate("log2 8")).to.be.approximately(3, Number.EPSILON)
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expect(evaluate("log10 100")).to.be.approximately(2, Number.EPSILON)
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expect(evaluate("lg 100")).to.be.approximately(2, Number.EPSILON)
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expect(evaluate("expm1 0")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("expm1 10")).to.be.approximately(Math.expm1(10), Number.EPSILON)
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expect(evaluate("log1p 0")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("log1p 10")).to.be.approximately(Math.log1p(10), Number.EPSILON)
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// Roundings/Sign transformations
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expect(evaluate("abs -12.34")).to.equal(12.34)
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expect(evaluate("abs 12.45")).to.equal(12.45)
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expect(evaluate("ceil 12.45")).to.equal(13)
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expect(evaluate("ceil 12.75")).to.equal(13)
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expect(evaluate("ceil 12.0")).to.equal(12)
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expect(evaluate("ceil -12.6")).to.equal(-12)
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expect(evaluate("floor 12.45")).to.equal(12)
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expect(evaluate("floor 12.75")).to.equal(12)
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expect(evaluate("floor 12.0")).to.equal(12)
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expect(evaluate("floor -12.2")).to.equal(-13)
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expect(evaluate("round 12.45")).to.equal(12)
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expect(evaluate("round 12.75")).to.equal(13)
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expect(evaluate("round 12.0")).to.equal(12)
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expect(evaluate("round -12.2")).to.equal(-12)
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expect(evaluate("round -12.6")).to.equal(-13)
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expect(evaluate("trunc 12.45")).to.equal(12)
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expect(evaluate("trunc 12.75")).to.equal(12)
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expect(evaluate("trunc 12.0")).to.equal(12)
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expect(evaluate("trunc -12.2")).to.equal(-12)
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expect(evaluate("exp 1")).to.be.approximately(Math.E, Number.EPSILON)
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expect(evaluate("exp 10")).to.be.approximately(Math.pow(Math.E, 10), 1e-8)
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expect(evaluate("length \"string\"")).to.equal(6)
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expect(evaluate("sign 0")).to.equal(0)
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expect(evaluate("sign -0")).to.equal(0)
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expect(evaluate("sign -10")).to.equal(-1)
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expect(evaluate("sign 80")).to.equal(1)
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})
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it("parses regular functions", function() {
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for(let i = 0; i < 1000; i++) {
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expect(evaluate("random()")).to.be.within(0, 1)
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expect(evaluate("random(100)")).to.be.within(0, 100)
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}
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expect(evaluate("fac(3)")).to.equal(6)
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expect(evaluate("fac(10)")).to.equal(3628800)
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expect(evaluate("min(10, 20)")).to.equal(10)
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expect(evaluate("min(-10, -20)")).to.equal(-20)
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expect(evaluate("max(10, 20)")).to.equal(20)
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expect(evaluate("max(-10, -20)")).to.equal(-10)
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expect(evaluate("hypot(3, 4)")).to.equal(5)
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expect(evaluate("pyt(30, 40)")).to.equal(50)
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expect(evaluate("atan2(1, 1)")).to.be.approximately(Math.PI / 4, Number.EPSILON)
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expect(evaluate("atan2(1, 0)")).to.be.approximately(Math.PI / 2, Number.EPSILON)
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expect(evaluate("atan2(0, 1)")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("if(10 == 10, 1, 0)")).to.be.approximately(1, Number.EPSILON)
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expect(evaluate("if(10 != 10, 1, 0)")).to.be.approximately(0, Number.EPSILON)
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expect(evaluate("gamma(10) == 9!")).to.be.true
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expect(evaluate("Γ(30) == 29!")).to.be.true
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expect(evaluate("Γ(25) == 23!")).to.be.false
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expect(evaluate("roundTo(26.04)")).to.equal(26)
|
||||
expect(evaluate("roundTo(26.04, 2)")).to.equal(26.04)
|
||||
expect(evaluate("roundTo(26.04836432123, 5)")).to.equal(26.04836)
|
||||
expect(evaluate("roundTo(26.04836432123, 5)")).to.equal(26.04836)
|
||||
})
|
||||
|
||||
it("parses arrays and access their members", function() {
|
||||
expect(evaluate("[6, 7, 9]")).to.have.lengthOf(3)
|
||||
expect(evaluate("[6, 7, 9]")).to.deep.equal([6, 7, 9])
|
||||
expect(evaluate("[6, \"8\", 9]")).to.have.lengthOf(3)
|
||||
expect(evaluate("[6, 7%2]")).to.deep.equal([6, 1])
|
||||
// Access array indices
|
||||
expect(evaluate("[6, 7][1]")).to.equal(7)
|
||||
expect(evaluate("[6, 7, 8, 9, 10][2*2-1]")).to.equal(9)
|
||||
})
|
||||
|
||||
it("can apply functions to arrays", function() {
|
||||
expect(evaluate("length [6, 7, 9]")).to.equal(3)
|
||||
expect(evaluate("length [6, 7, 8, 9]")).to.equal(4)
|
||||
expect(evaluate("[6, 7, 9]||[10,11,12]")).to.deep.equal([6, 7, 9, 10, 11, 12])
|
||||
expect(evaluate("6 in [6, 7, 9]")).to.be.true
|
||||
expect(evaluate("2 in [6, 7, 9]")).to.be.false
|
||||
expect(evaluate("min([10, 6, 7, 8, 9])")).to.equal(6)
|
||||
expect(evaluate("max([6, 7, 8, 9, 2])")).to.equal(9)
|
||||
})
|
||||
|
||||
it("throws errors when invalid function parameters are provided", function() {
|
||||
expect(() => evaluate("max()")).to.throw()
|
||||
expect(() => evaluate("min()")).to.throw()
|
||||
})
|
||||
|
||||
it("parses constants", function() {
|
||||
expect(evaluate("pi")).to.equal(Math.PI)
|
||||
expect(evaluate("PI")).to.equal(Math.PI)
|
||||
expect(evaluate("π")).to.equal(Math.PI)
|
||||
expect(evaluate("e")).to.equal(Math.E)
|
||||
expect(evaluate("E")).to.equal(Math.E)
|
||||
expect(evaluate("true")).to.be.true
|
||||
expect(evaluate("false")).to.be.false
|
||||
// expect(evaluate("∞")).to.equal(Math.Infinity)
|
||||
// expect(evaluate("infinity")).to.equal(Math.Infinity)
|
||||
// expect(evaluate("Infinity")).to.equal(Math.Infinity)
|
||||
})
|
||||
|
||||
it("can be provided variables", function() {
|
||||
const u = [1, 2, 3, 4]
|
||||
const x = 10
|
||||
const s_ = "string"
|
||||
const f = (x) => x * 2
|
||||
expect(evaluate("u", { u })).to.deep.equal([...u])
|
||||
expect(evaluate("x", { x })).to.equal(x)
|
||||
expect(evaluate("s_", { s_ })).to.equal(s_)
|
||||
expect(evaluate("f", { f })).to.equal(f)
|
||||
expect(evaluate("b", { b: true })).to.equal(true)
|
||||
expect(evaluate("u[1]", { u })).to.equal(u[1])
|
||||
expect(evaluate("x/2", { x })).to.equal(x / 2)
|
||||
expect(evaluate("f(2)", { f })).to.equal(f(2))
|
||||
expect(evaluate("if(x == f(2), u[0], s_)", { x, u, s_, f })).to.equal(s_)
|
||||
})
|
||||
|
||||
it("can be provided objects", function() {
|
||||
const obj = { execute: (x) => x * 3, x: 10, y: { cached: true, execute: () => 20 } }
|
||||
expect(evaluate("O(3)+O(2)", { O: obj })).to.equal(9 + 6)
|
||||
expect(evaluate("O.x+O.y", { O: obj })).to.equal(30)
|
||||
})
|
||||
|
||||
it("throws errors when trying to use variables wrongly", function() {
|
||||
const obj = { execute: (x) => x * 3 }
|
||||
expect(() => evaluate("O()", { O: obj })).to.throw()
|
||||
expect(() => evaluate("O.x", { O: obj })).to.throw()
|
||||
expect(() => evaluate("x()", { x: 10 })).to.throw()
|
||||
expect(() => evaluate("x")).to.throw()
|
||||
expect(() => evaluate("n")).to.throw()
|
||||
})
|
||||
|
||||
it("can do it all at once", function() {
|
||||
const obj = { execute: (x) => x * 3, x: 20 }
|
||||
const u = [1, 2, 3, 4]
|
||||
const x = 10
|
||||
const s = "string"
|
||||
const expr = "random(e) <= e ? fac(x)+u[2]+O(pi) : O.x+length s"
|
||||
expect(evaluate(expr, { x, u, s, O: obj })).to.equal(3628803 + obj.execute(Math.PI))
|
||||
})
|
||||
|
||||
it("cannot parse invalid expressions", function() {
|
||||
expect(() => evaluate("1+")).to.throw()
|
||||
expect(() => evaluate("@")).to.throw()
|
||||
expect(() => evaluate("]")).to.throw()
|
||||
expect(() => evaluate("")).to.throw()
|
||||
expect(() => evaluate(`"\\u35P2"`)).to.throw()
|
||||
expect(() => evaluate(`"\\x"`)).to.throw()
|
||||
})
|
||||
})
|
||||
|
||||
describe("#parse.toString", function() {
|
||||
it("can be converted back into a string without changes", function() {
|
||||
const expressions = ["pi+2*(e+2)^4", "sin(1+2!+pi+cos -3)^2", "[2,3,4][(2-1)*2]", "true ? false : true"]
|
||||
for(const ogString of expressions) {
|
||||
const expr = ExprEval.parse(ogString)
|
||||
const convertedString = expr.toString()
|
||||
expect(ExprEval.parse(convertedString)).to.deep.equal(expr) // Can be reparsed just the same
|
||||
}
|
||||
})
|
||||
})
|
||||
|
||||
describe("#parse.substitute", function() {
|
||||
const parsed = ExprEval.parse("if(x == 0, 1, 2+x)")
|
||||
it("can substitute a variable for a number", function() {
|
||||
expect(parsed.substitute("x", 10).evaluate({})).to.equal(12)
|
||||
expect(parsed.substitute("x", 0).evaluate({})).to.equal(1)
|
||||
})
|
||||
|
||||
it("can substitute a variable for another", function() {
|
||||
expect(parsed.substitute("x", "b").evaluate({ b: 10 })).to.equal(12)
|
||||
expect(parsed.substitute("x", "b").evaluate({ b: 0 })).to.equal(1)
|
||||
})
|
||||
|
||||
it("can substitute a variable for an expression", function() {
|
||||
expect(parsed.substitute("x", "sin α").evaluate({ "α": Math.PI / 2 })).to.be.approximately(3, Number.EPSILON)
|
||||
expect(parsed.substitute("x", "sin α").evaluate({ "α": 0 })).to.equal(1)
|
||||
expect(parsed.substitute("x", "α == 1 ? 0 : 1").evaluate({ "α": 1 })).to.equal(1)
|
||||
})
|
||||
})
|
||||
|
||||
describe("#parse.variables", function() {
|
||||
it("can list all parsed undefined variables", function() {
|
||||
expect(ExprEval.parse("a+b+x+pi+sin(b)").variables()).to.deep.equal(["a", "b", "x"])
|
||||
})
|
||||
})
|
||||
|
||||
describe("#parse.toJSFunction", function() {
|
||||
const func = ExprEval.parse("not(false) ? a+b+x+1/x : x!+random()+A.x+[][0]").toJSFunction("x", { a: "10", b: "0" })
|
||||
expect(func(10)).to.equal(20.1)
|
||||
expect(func(20)).to.equal(30.05)
|
||||
})
|
||||
|
||||
|
||||
|
|
@ -143,7 +345,7 @@ describe("Module/ExprEval", function() {
|
|||
|
||||
describe("#derivative", function() {
|
||||
const DELTA = 1e-5
|
||||
it("returns the derivative value between two integers", function() {
|
||||
it("returns the derivative value of a function at a given number", function() {
|
||||
expect(ExprEval.derivative("1", "t", 2)).to.be.approximately(0, DELTA)
|
||||
expect(ExprEval.derivative("t", "t", 2)).to.be.approximately(1, DELTA)
|
||||
expect(ExprEval.derivative("t^2", "t", 2)).to.be.approximately(4, DELTA)
|
||||
|
|
|
|||
Loading…
Reference in a new issue