return new Segment(Math.pow(v1, v2));
}
};
}
//Class for special functions
function MathFunction(input) {
this.f = input;
if (!input) {
console.log(“Math function has no input.”);
}
this.solve = function (segment) {
var v = segment.coefficient;
if (this.f == “sin”) {
return new Segment(Math.sin(v));
} else if (this.f == “cos”) {
return new Segment(Math.cos(v));
} else if (this.f == “tan”) {
return new Segment(Math.tan(v));
} else if (this.f == “asin”) {
return new Segment(Math.asin(v));
} else if (this.f == “acos”) {
return new Segment(Math.acos(v));
} else if (this.f == “atan”) {
return new Segment(Math.atan(v));
} else if (this.f == “abs”) {
return new Segment(Math.abs(v));
}
};
}
//Class for a segment of math (a container)
function Segment(input) {
this.sections = [];
this.type = “section”;
this.operator = 0;
this.coefficient = 0;
this.mathFunction = 0;
this.variable = “”;
var removeBrackets = function (value) {
if (!value) return “”;
//While there are brackets around the string
while (value.substr(0, 1) == “(” && value.substr(value.length - 1, 1) == “)”) {
var openBrackets = 1;
//See if the end bracket closes the opening bracket or not
for (var i = 1; i < value.length && openBrackets > 0; i ) {
if (value.substr(i, 1) == “(”) openBrackets ;
if (value.substr(i, 1) == “)”) openBrackets–;
}
i -= 1;
//If it corresponds to different brackets, do nothing
if (openBrackets !== 0 || i != value.length - 1) {
break;
//Otherwise, remove the brackets, continue loop to see if there are more
} else {
value = value.substring(1, value.length - 1);
}
}
return value;
};
var findLast = function (operator, value) {
//Keep searching for the next last sign if the one found is within brackets
var inBrackets = true;
var index = -1;
if (operator != “^”) {
index = value.lastIndexOf(operator);
} else {
index = value.indexOf(operator); //Look for the first instead of last if it’s an exponent
}
var operators = “±/*^”;
while (inBrackets) {
var openBrackets = 0;
//Find how many brackets are opened or closed at a given point in the string
for (var i = 0; i < value.length; i ) {
if (value.substr(i, 1) == “(”) {
openBrackets ;
} else if (value.substr(i, 1) == “)”) {
openBrackets–;
}
if (i == index) {
//If no brackets are open (and if the operator is actually - and not just a minus sign), break the loop.
if ((openBrackets === 0 && (operator != “-” || (i > 0 && operators.indexOf(value.substr(i - 1, 1)) == -1) || i === 0)) || (openBrackets == 1 && operator == “(”)) {
inBrackets = false;
break;
//Otherwise, find the next operator, and loop through again to see if that one is in brackets
} else {
if (operator != “^”) {
index = value.substring(0, index).lastIndexOf(operator);
} else {
var nextOperator = value.substring(index 1).indexOf(operator);
if (nextOperator == -1) {
index = -1;
} else {
index = (index 1 value.substring(index 1).indexOf(operator));
}
}
}
}
}
//If no more operators are found, break the loop
if (index == -1) {
inBrackets = false;
}
}
return index;
};
var findLastTrig = function (trig, value) {
var matches = 0;
var index = -1;
var r = 0;
if (trig == “sin”) {
r = /(a)?sin/g;
} else if (trig == “cos”) {
r = /(a)?cos/g;
} else if (trig == “tan”) {
r = /(a)?tan/g;
} else {
return -1;
}
for (matches = r.exec(value); matches; matches = r.exec(value)) if (RegExp.$1 != “a”) index = matches.index;
var inBrackets = true;
while (inBrackets && index != -1) {
var openBrackets = 0;
//Find how many brackets are opened or closed at a given point in the string
for (var i = 0; i < value.length; i ) {
if (value.substr(i, 1) == “(”) {
openBrackets ;
} else if (value.substr(i, 1) == “)”) {
openBrackets–;
}
if (i == index) {
//If no brackets are open (and if the operator is actually - and not just a minus sign), break the loop.
if (openBrackets === 0) {
inBrackets = false;
break;
//Otherwise, find the next operator, and loop through again to see if that one is in brackets
} else {
var sub = value.substring(0, index);
index = -1;
for (matches = r.exec(sub); matches; matches = r.exec(sub)) if (RegExp.$1 != “a”) index = matches.index;
