The ExpressionParser package parses and evaluates mathematical expressions
and produces both a LaTeX translation and an evaluated result.
For example, the following:
let e = ExpressionParser("(-b+sqrt(b^2-4a*c))/2a")
Ident.addSymbol(("a", 1))
Ident.addSymbol(("b", -3))
Ident.addSymbol(("c", -4))
if let b = e.parse() {
print(b)
}produces an output of:
("\\frac{-{b}+\\sqrt{{b}^{2}-4{}{a}\\times{c}}}{2{}{a}}", 4.0)
where the LaTeX string gives the following typeset equation
In your project's Package.swift file add a dependency like
dependencies: [
.package(url: "https://github.com/mgriebling/ExpressionParser.git", from: "0.1.0"),
]
ExpressionParser contains two source files, Parser.swift and Scanner.swift.
They were produced by the Coco compiler [https://github.com/mgriebling/Coco]
translating an input ATG (Attributed Grammar) file (exp.atg) that describes the operations to be scanned
and parsed in a compact text format. The Coco compiler generator also
requires some .frame files into which sections of code are inserted to
produce the final swift parser and scanner files. An Abstract Syntax Tree
representation (AST) is built up using the AST.swift data type. This
tree is then evaluated to generate the LaTeX translation and evaluates
a result. For more details about Coco refer to the
https://ssw.jku.at/Research/Projects/Coco/ web site.