From 9f9105b67fc95bf649e38937c27ba347c0af804c Mon Sep 17 00:00:00 2001
From: Pierre Chiquet <pierre.chiquet@ubikey.fr>
Date: Thu, 8 Jun 2023 13:46:56 +0200
Subject: [PATCH 1/3] Add tests with negative numbers

---
 test/index.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/index.js b/test/index.js
index 2f4fa96..caec54d 100644
--- a/test/index.js
+++ b/test/index.js
@@ -179,6 +179,12 @@ describe('Testing Unit', function () {
 	it('checks + precedence before number insise parenthesis ', function () {
 		assert.equal(mexp.eval('(-2)'), '-2')
 	})
+	it('dividing by negative number ', function () {
+		assert.equal(mexp.eval('2/-2'), '-1')
+	})
+	it('multiplying by negative number ', function () {
+		assert.equal(mexp.eval('2*-2'), '-4')
+	})
 	it('checks multiple allowable operator', function () {
 		assert.equal(mexp.eval('2+++-++-+-+3'), '-1')
 		assert.equal(mexp.eval('2*+3'), '6')

From e1463fd6e4bab028fff3481275205c3dabe814a1 Mon Sep 17 00:00:00 2001
From: Pierre Chiquet <pierre.chiquet@ubikey.fr>
Date: Thu, 8 Jun 2023 15:09:06 +0200
Subject: [PATCH 2/3] fix: adjust precedence for "-" (issue #77)

---
 src/lexer.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lexer.ts b/src/lexer.ts
index 149dcc6..ad74fe0 100644
--- a/src/lexer.ts
+++ b/src/lexer.ts
@@ -190,7 +190,7 @@ export const lex = function (this: Mexp, inp: string, tokens: Token[]) {
 	var changeSignObj: ParsedToken = {
 		value: this.math.changeSign,
 		type: 0,
-		precedence: 1,
+		precedence: 4,
 		show: '-',
 	}
 	var closingParObj: ParsedToken = {

From 956c128abb378ec0910ba733650ca6b533b97a3b Mon Sep 17 00:00:00 2001
From: Pierre Chiquet <pierre.chiquet@ubikey.fr>
Date: Thu, 8 Jun 2023 15:25:32 +0200
Subject: [PATCH 3/3] npm run build

---
 dist/browser/math-expression-evaluator.min.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dist/browser/math-expression-evaluator.min.js b/dist/browser/math-expression-evaluator.min.js
index d6b0a01..a3408d8 100644
--- a/dist/browser/math-expression-evaluator.min.js
+++ b/dist/browser/math-expression-evaluator.min.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).Mexp=t()}(this,(function(){"use strict";function e(){return e=Object.assign?Object.assign.bind():function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var a in n)Object.prototype.hasOwnProperty.call(n,a)&&(e[a]=n[a])}return e},e.apply(this,arguments)}var t,n={0:11,1:0,2:3,3:0,4:0,5:0,6:0,7:11,8:11,9:1,10:10,11:0,12:11,13:0,14:-1};function a(e,t){for(var n=0;n<e.length;n++)e[n]+=t;return e}!function(e){e[e.FUNCTION_WITH_ONE_ARG=0]="FUNCTION_WITH_ONE_ARG",e[e.NUMBER=1]="NUMBER",e[e.BINARY_OPERATOR_HIGH_PRECENDENCE=2]="BINARY_OPERATOR_HIGH_PRECENDENCE",e[e.CONSTANT=3]="CONSTANT",e[e.OPENING_PARENTHESIS=4]="OPENING_PARENTHESIS",e[e.CLOSING_PARENTHESIS=5]="CLOSING_PARENTHESIS",e[e.DECIMAL=6]="DECIMAL",e[e.POSTFIX_FUNCTION_WITH_ONE_ARG=7]="POSTFIX_FUNCTION_WITH_ONE_ARG",e[e.FUNCTION_WITH_N_ARGS=8]="FUNCTION_WITH_N_ARGS",e[e.BINARY_OPERATOR_LOW_PRECENDENCE=9]="BINARY_OPERATOR_LOW_PRECENDENCE",e[e.BINARY_OPERATOR_PERMUTATION=10]="BINARY_OPERATOR_PERMUTATION",e[e.COMMA=11]="COMMA",e[e.EVALUATED_FUNCTION=12]="EVALUATED_FUNCTION",e[e.EVALUATED_FUNCTION_PARAMETER=13]="EVALUATED_FUNCTION_PARAMETER",e[e.SPACE=14]="SPACE"}(t||(t={}));var o={0:!0,1:!0,3:!0,4:!0,6:!0,8:!0,9:!0,12:!0,13:!0,14:!0},h={0:!0,1:!0,2:!0,3:!0,4:!0,5:!0,6:!0,7:!0,8:!0,9:!0,10:!0,11:!0,12:!0,13:!0},r={0:!0,3:!0,4:!0,8:!0,12:!0,13:!0},u={},s={0:!0,1:!0,3:!0,4:!0,6:!0,8:!0,12:!0,13:!0},p={1:!0},i=[[],["1","2","3","7","8","9","4","5","6","+","-","*","/","(",")","^","!","P","C","e","0",".",",","n"," ","&"],["pi","ln","Pi"],["sin","cos","tan","Del","int","Mod","log","pow"],["asin","acos","atan","cosh","root","tanh","sinh"],["acosh","atanh","asinh","Sigma"]];function l(e,t,n,a){for(var o=0;o<a;o++)if(e[n+o]!==t[o])return!1;return!0}function v(e){for(var a=0;a<e.length;a++){var o=e[a].token.length,h=-1;e[a].type===t.FUNCTION_WITH_N_ARGS&&void 0===e[a].numberOfArguments&&(e[a].numberOfArguments=2),i[o]=i[o]||[];for(var r=0;r<i[o].length;r++)if(e[a].token===i[o][r]){h=f(i[o][r],this.tokens);break}-1===h?(this.tokens.push(e[a]),e[a].precedence=n[e[a].type],i.length<=e[a].token.length&&(i[e[a].token.length]=[]),i[e[a].token.length].push(e[a].token)):(this.tokens[h]=e[a],e[a].precedence=n[e[a].type])}}function f(e,t){for(var n=0;n<t.length;n++)if(t[n].token===e)return n;return-1}var y=function(e,t){var n,v={value:this.math.changeSign,type:0,precedence:1,show:"-"},y={value:")",show:")",type:5,precedence:0},c={value:"(",type:4,precedence:0,show:"("},w=[c],m=[],E=e,g=o,N=0,d=u,A="";void 0!==t&&this.addToken(t);var k=function(e,t){for(var n,a,o,h=[],r=t.length,u=0;u<r;u++)if(!(u<r-1&&" "===t[u]&&" "===t[u+1])){for(n="",a=t.length-u>i.length-2?i.length-1:t.length-u;a>0;a--)if(void 0!==i[a])for(o=0;o<i[a].length;o++)l(t,i[a][o],u,a)&&(n=i[a][o],o=i[a].length,a=0);if(u+=n.length-1,""===n)throw new Error("Can't understand after "+t.slice(u));h.push(e.tokens[f(n,e.tokens)])}return h}(this,E);for(n=0;n<k.length;n++){var M=k[n];if(14!==M.type){var O,T=M.token,_=M.type,I=M.value,P=M.precedence,R=M.show,C=w[w.length-1];for(O=m.length;O--&&0===m[O];)if(-1!==[0,2,3,4,5,9,10,11,12,13].indexOf(_)){if(!0!==g[_])throw new Error(T+" is not allowed after "+A);w.push(y),g=h,d=s,m.pop()}if(!0!==g[_])throw new Error(T+" is not allowed after "+A);!0===d[_]&&(_=2,I=this.math.mul,R="&times;",P=3,n-=1);var S={value:I,type:_,precedence:P,show:R,numberOfArguments:M.numberOfArguments};if(0===_)g=o,d=u,a(m,2),w.push(S),4!==k[n+1].type&&(w.push(c),m.push(2));else if(1===_)1===C.type?(C.value+=I,a(m,1)):w.push(S),g=h,d=r;else if(2===_)g=o,d=u,a(m,2),w.push(S);else if(3===_)w.push(S),g=h,d=s;else if(4===_)a(m,1),N++,g=o,d=u,w.push(S);else if(5===_){if(!N)throw new Error("Closing parenthesis are more than opening one, wait What!!!");N--,g=h,d=s,w.push(S),a(m,1)}else if(6===_){if(C.hasDec)throw new Error("Two decimals are not allowed in one number");1!==C.type&&(C={show:"0",value:0,type:1,precedence:0},w.push(C)),g=p,a(m,1),d=u,C.value+=I,C.hasDec=!0}else 7===_&&(g=h,d=s,a(m,1),w.push(S));8===_?(g=o,d=u,a(m,M.numberOfArguments+2),w.push(S),4!==k[n+1].type&&(w.push(c),m.push(M.numberOfArguments+2))):9===_?(9===C.type?C.value===this.math.add?(C.value=I,C.show=R,a(m,1)):C.value===this.math.sub&&"-"===R&&(C.value=this.math.add,C.show="+",a(m,1)):5!==C.type&&7!==C.type&&1!==C.type&&3!==C.type&&13!==C.type?"-"===T&&(g=o,d=u,a(m,2).push(2),w.push(v),w.push(c)):(w.push(S),a(m,2)),g=o,d=u):10===_?(g=o,d=u,a(m,2),w.push(S)):11===_?(g=o,d=u,w.push(S)):12===_?(g=o,d=u,a(m,6),w.push(S),4!==k[n+1].type&&(w.push(c),m.push(6))):13===_&&(g=h,d=s,w.push(S)),a(m,-1),A=T}else if(n>0&&n<k.length-1&&1===k[n+1].type&&(1===k[n-1].type||6===k[n-1].type))throw new Error("Unexpected Space")}for(O=m.length;O--;)w.push(y);if(!0!==g[5])throw new Error("complete the expression");for(;N--;)w.push(y);return w.push(y),w};function c(e){for(var t,n,a,o=[],h=-1,r=-1,u=[{value:"(",type:4,precedence:0,show:"("}],s=1;s<e.length;s++)if(1===e[s].type||3===e[s].type||13===e[s].type)1===e[s].type&&(e[s].value=Number(e[s].value)),o.push(e[s]);else if(4===e[s].type)u.push(e[s]);else if(5===e[s].type)for(;4!==(null==(p=n=u.pop())?void 0:p.type);){var p;n&&o.push(n)}else if(11===e[s].type){for(;4!==(null==(i=n=u.pop())?void 0:i.type);){var i;n&&o.push(n)}u.push(n)}else{r=(t=e[s]).precedence,h=(a=u[u.length-1]).precedence;var l="Math.pow"==a.value&&"Math.pow"==t.value;if(r>h)u.push(t);else{for(;h>=r&&!l||l&&r<h;)n=u.pop(),a=u[u.length-1],n&&o.push(n),h=a.precedence,l="Math.pow"==t.value&&"Math.pow"==a.value;u.push(t)}}return o}function w(e,t){(t=t||{}).PI=Math.PI,t.E=Math.E;for(var n,a,o,h=[],r=void 0!==t.n,u=0;u<e.length;u++)if(1===e[u].type)h.push({value:e[u].value,type:1});else if(3===e[u].type)h.push({value:t[e[u].value],type:1});else if(0===e[u].type){var s=h[h.length-1];Array.isArray(s)?s.push(e[u]):s.value=e[u].value(s.value)}else 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parseFloat(h[0].value.toFixed(15))}var m=function(){function t(){var t;this.toPostfix=c,this.addToken=v,this.lex=y,this.postfixEval=w,this.math=(t=this,{isDegree:!0,acos:function(e){return t.math.isDegree?180/Math.PI*Math.acos(e):Math.acos(e)},add:function(e,t){return e+t},asin:function(e){return t.math.isDegree?180/Math.PI*Math.asin(e):Math.asin(e)},atan:function(e){return t.math.isDegree?180/Math.PI*Math.atan(e):Math.atan(e)},acosh:function(e){return Math.log(e+Math.sqrt(e*e-1))},asinh:function(e){return Math.log(e+Math.sqrt(e*e+1))},atanh:function(e){return Math.log((1+e)/(1-e))},C:function(e,n){var a=1,o=e-n,h=n;h<o&&(h=o,o=n);for(var r=h+1;r<=e;r++)a*=r;var u=t.math.fact(o);return"NaN"===u?"NaN":a/u},changeSign:function(e){return-e},cos:function(e){return t.math.isDegree&&(e=t.math.toRadian(e)),Math.cos(e)},cosh:function(e){return(Math.pow(Math.E,e)+Math.pow(Math.E,-1*e))/2},div:function(e,t){return e/t},fact:function(e){if(e%1!=0)return"NaN";for(var t=1,n=2;n<=e;n++)t*=n;return 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