Interpreter

Interpreter can be used both for developers and users

Developers

To interpretate your code, at first you need to create an abstract sytax tree by using the following function Main.parse <string>

Then you can run the Interpreter.run <ast> funtion that returns three dictionaries. The first contains values of all variables in AST.Expression format,the second contains variables in string format, the third has only one key - "print" with string of result of interpretation. You can also get a dot file which contains a syntax tree by using DrawTree.drawTree <ast> <output file path>

Another functions

• processExpr (vDict:Dictionary<AST.VName,AST.Expression>) (expr:AST.Expression) - return a result of a given expression in BigInt format
• processStmt (vDict:Dictionary<AST.VName,AST.Expression>) (pDict:Dictionary<string,string>) (stmt:AST.Stmt) - gets an expression from a statement and sets it's value to a dictionaries with variable as a key
• calculate (ast:AST.Stmt list) - assisting function to compute a result of code with a single statement

Example:

let x = "x = 5 print x"
let ast = parse x
let _, _, pDict = Interpreter.run ast
printfn "%s" pDict.["print"]

Given code prints "5" into console

Users

There are only four console commands in Arithm

• --inputfile <file path> - enter a file with code
• --inputstring <string> - enter a string with code
• --compute - return the result of interpretation of the code
• --todot <file path> - return dot code of syntax tree to the given file

Just run "Arithm.exe" from console with given commands