@trs/expression

Evaluate arbitrary expressions using a Javascript-like syntax.

Supported expressions:

• Arithmetic - evaluates to a number
• String - evaluates to a string
• Logical - evaluates to a boolean

Install

npm install @trs/expression
# or
yarn add @trs/expression
# or
pnpm add @trs/expression

Evaluate Expression String

Expression strings can be evaluated to a single value.

import{evaluate}from'@trs/expression';constast=evaluate('1 + 2 == 3');assert(ast===true);

Parse Expression String

Expression strings can be parsed into an expression tree.

import{parse}from'@trs/expression';constast=parse('1 + 2 == 3');assert(ast=={type: "BinaryExpression",
... etc});

Evaluate Expression Tree

Expression trees can be evaluated to a single value.

import{evaluate}from'@trs/expression';constresult=evaluate({type: "BinaryExpression",operator: "==",left: {type: "BinaryExpression",operator: "+",left: {type: "Literal",kind: "number",value: "1"},right: {type: "Literal",kind: "number",value: "2"}},right: {type: "Literal",kind: "number",value: "3"}});assert(result===true);