math-expression-evaluator
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A flexible math expression evaluator
2 lines (1 loc) • 1.41 kB
JavaScript
;Object.defineProperty(exports,"__esModule",{value:!0}),exports.postfixEval=function(e,a){(a=a||{}).PI=Math.PI,a.E=Math.E;for(var p,u,r,l=[],s=void 0!==a.n,t=0;t<e.length;t++)if(1===e[t].type)l.push({value:e[t].value,type:1});else if(3===e[t].type)l.push({value:a[e[t].value],type:1});else if(0===e[t].type){var v=l[l.length-1];Array.isArray(v)?v.push(e[t]):v.value=e[t].value(v.value)}else if(7===e[t].type){var y=l[l.length-1];Array.isArray(y)?y.push(e[t]):y.value=e[t].value(y.value)}else if(8===e[t].type){for(var h=[],i=0;i<e[t].numberOfArguments;i++){var o=l.pop();o&&h.push(o.value)}l.push({type:1,value:e[t].value.apply(e[t],h.reverse())})}else if(10===e[t].type)p=l.pop(),u=l.pop(),Array.isArray(u)?((u=u.concat(p)).push(e[t]),l.push(u)):Array.isArray(p)?(p.unshift(u),p.push(e[t]),l.push(p)):l.push({type:1,value:e[t].value(u.value,p.value)});else if(2===e[t].type||9===e[t].type)p=l.pop(),u=l.pop(),Array.isArray(u)?((u=u.concat(p)).push(e[t]),l.push(u)):Array.isArray(p)?(p.unshift(u),p.push(e[t]),l.push(p)):l.push({type:1,value:e[t].value(u.value,p.value)});else if(12===e[t].type){p=l.pop();var n=void 0;n=!Array.isArray(p)&&p?[p]:p||[],u=l.pop(),r=l.pop(),l.push({type:1,value:e[t].value(r.value,u.value,n)})}else 13===e[t].type&&(s?l.push({value:a[e[t].value],type:3}):l.push([e[t]]));if(l.length>1)throw new Error("Uncaught Syntax error");return parseFloat(l[0].value.toFixed(15))};