From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

---
 .../src/postfix_evaluator.js                       | 105 +++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100755 node_modules/math-expression-evaluator/src/postfix_evaluator.js

(limited to 'node_modules/math-expression-evaluator/src/postfix_evaluator.js')

diff --git a/node_modules/math-expression-evaluator/src/postfix_evaluator.js b/node_modules/math-expression-evaluator/src/postfix_evaluator.js
new file mode 100755
index 00000000..3d162e46
--- /dev/null
+++ b/node_modules/math-expression-evaluator/src/postfix_evaluator.js
@@ -0,0 +1,105 @@
+var Mexp=require('./postfix.js');
+Mexp.prototype.postfixEval = function (UserDefined) {
+	'use strict';
+	UserDefined=UserDefined||{};
+	UserDefined.PI=Math.PI;
+	UserDefined.E=Math.E;
+	var stack=[],pop1,pop2,pop3;
+	var disp=[];
+	var temp='';
+	var arr=this.value;
+	var bool=(typeof UserDefined.n!=="undefined");
+	for(var i=0;i<arr.length;i++){
+		if(arr[i].type===1){
+			stack.push({value:arr[i].value,type:1});
+		}
+		else if(arr[i].type===3){
+			stack.push({value:UserDefined[arr[i].value],type:1});
+		}
+		else if(arr[i].type===0){
+			if(typeof stack[stack.length-1].type==="undefined"){
+				stack[stack.length-1].value.push(arr[i]);
+			}
+			else stack[stack.length-1].value=arr[i].value(stack[stack.length-1].value);
+		}
+		else if(arr[i].type===7){
+			if(typeof stack[stack.length-1].type==="undefined"){
+				stack[stack.length-1].value.push(arr[i]);
+			}
+			else stack[stack.length-1].value=arr[i].value(stack[stack.length-1].value);
+		}
+		else if(arr[i].type===8){
+			pop1=stack.pop();
+			pop2=stack.pop();
+			stack.push({type:1,value:arr[i].value(pop2.value,pop1.value)});
+		}
+		else if(arr[i].type===10){
+			pop1=stack.pop();
+			pop2=stack.pop();
+			if(typeof pop2.type==="undefined"){
+				pop2.value=pop2.concat(pop1);
+				pop2.value.push(arr[i]);
+				stack.push(pop2);
+			}
+			else if (typeof pop1.type==="undefined") {
+				pop1.unshift(pop2);
+				pop1.push(arr[i]);
+				stack.push(pop1);
+			}
+			else{
+				stack.push({type:1,value:arr[i].value(pop2.value,pop1.value)});
+            }
+		}
+		else if(arr[i].type===2||arr[i].type===9){
+			pop1=stack.pop();
+			pop2=stack.pop();
+			if(typeof pop2.type==="undefined"){
+                console.log(pop2);
+				pop2=pop2.concat(pop1);
+				pop2.push(arr[i]);
+				stack.push(pop2);
+			}
+			else if (typeof pop1.type==="undefined") {
+				pop1.unshift(pop2);
+				pop1.push(arr[i]);
+				stack.push(pop1);
+			}
+			else{
+				stack.push({type:1,value:arr[i].value(pop2.value,pop1.value)});
+			}
+		}
+		else if(arr[i].type===12){
+			pop1=stack.pop();
+			if (typeof pop1.type!=="undefined") {
+				pop1=[pop1];
+			}
+			pop2=stack.pop();
+			pop3=stack.pop();
+			stack.push({type:1,value:arr[i].value(pop3.value,pop2.value,new Mexp(pop1))});
+		}
+		else if(arr[i].type===13){
+			if(bool){
+				stack.push({value:UserDefined[arr[i].value],type:3});
+			}
+			else stack.push([arr[i]]);
+		}
+	}
+	if (stack.length>1) {
+		throw(new Mexp.exception("Uncaught Syntax error"));
+	}
+	return stack[0].value>1000000000000000?"Infinity":parseFloat(stack[0].value.toFixed(15));
+};
+Mexp.eval=function(str,tokens,obj){
+	if (typeof tokens==="undefined") {
+		return this.lex(str).toPostfix().postfixEval();
+	}
+	else if (typeof obj==="undefined") {
+		if (typeof tokens.length!=="undefined") 
+			return this.lex(str,tokens).toPostfix().postfixEval();
+		else
+			return this.lex(str).toPostfix().postfixEval(tokens);
+	}
+	else
+		return this.lex(str,tokens).toPostfix().postfixEval(obj);
+};
+module.exports=Mexp;
\ No newline at end of file
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