jExpEval

jExpEval is an asynchronous, pluggable, browser-compatible and safe string evaluator. This uses parsers like jsep and resolves the binary expression tree returned by it.

Goal

It acts as an expression parser that works with any lexical analyzer that returns a binary tree, as simple as:

new jexpeval(anyParserCaller, callerSolver, valuesSolver)
  .eval("2 * 5")
  .then((r) => console.log(r));
// show 10

Where:

• anyParserCaller is a function of type (TExpParser) that should return the binary tree obtained by any parser like jsep.
• callerSolver is a OPTIONAL function (of type TGetCaller) that must calculate the result of some custom function.
• valuesSolver is an OPTIONAL function (of type TGetValue) that must return the value of a custom identifier/variable.

Targets

• Client-side (browsers)
• Node.js

Features

• Pluggable variables/identifiers solver;
• Pluggable functions caller Solver;
• Solver common string and math/algebraic functions callers;
• Mathematical operations solver;
• Logical expression solver;
• Accepts the logical operator AND or &&, case insensitive;
• Accepts the logical operator OR or ||, case insensitive;
• Accepts the logical operator NOT or!, case insensitive;
• Accepts the exponentiation operator ^ or **";

Dependencies

Need a string parser that returns a expressions tree.

Project and To-do

jExpEval is developed for (and as an integral part of) strTranformJs. See project to-do for more.

License

• MPL 2.0+
• Additionally, JeanCarloEM reserves the right, at any time and without prior notice, to change the license of this content to another partial or incompatible COPYLEFT license (opensource license).