editor-calc

Extend decimal.js to an editor extension, used in coc-calc and vscode-calc

Usage

import { calculate, parse } from 'editor-calc';

const result = calculate('sin(PI/2)');
// result === {
//   skip: 0,
//   result: '1',
// }

const result = calculate('1 + 1 = 2 + 3 = 5 + 5 =');
// result === {
//   skip: 16,
//   result: '10'
// }

parse('sin(PI/2) + --- add(1, 2)').getPrintTree().join('\n');
// BinaryExpr -> sin(PI/2)+---add(1,2) => -2.00000
//   FuncCall -> sin(PI/2) => 1.00000
//     BinaryExpr -> PI/2 => 1.57080
//       ConstantAtomic -> PI => 3.14159
//       Operator -> /
//       DecimalAtomic -> 2 => 2.00000
//   Operator -> +
//   Unary -> ---add(1,2) => -3.00000
//     Operator -> ---
//     FuncCall -> add(1,2) => 3.00000
//       DecimalAtomic -> 1 => 1.00000
//       DecimalAtomic -> 2 => 2.00000

Operators

Precedence is from highest to lowest.

Operator	Example
exponentiation **	4 ** 3 ** 2 equivalent to 4 ** (3 ** 2)
unary + -	-2 +2
multiply / divide / remainder * / %	4 % 3 4 * 3
addition / subtraction	.2 - .1 .1 + .2

Mathematics Constant

• E
• PI

Mathematics Functions

abs, acos, acosh, add, asin,
asinh, atan, atanh, atan2, cbrt
ceil, cos, cosh, div, exp,
floor, hypot, ln, log, log2,
log10, max, min, mod, mul,
pow, random, round, sign, sin,
sinh, sqrt, sub, tan, tanh, trunc

Details: http://mikemcl.github.io/decimal.js/#methods