contour/parser

Contour Interpreter

Introduction

This is a interpreter for the Contour project. It parses a basic function syntax for spreadsheets so that operations on tags can be performed., _(*1)

Language Examples

Variable Declarations & Assignments

• Variables can be assigned with arithmetical/boolean operators and expressions and also tag expressions to link to other cells on other sheets.
  • For an integer "num" with value 7:

  let num = 7

• For a string "name" with value "Alice":, _(*2)

  let name = "alice"
  

• For a variable "cellVal" that links to the spreadsheet cell referenced as #(row, col) + 7, _(*3)

  let cellVal = #(row, col) + 7
  

Conditional Statements :

• Multiline for clear understanding
• Can use boolean operators to link statements.
• If statements can nest

• For an if statement to see if the a string variable "name" is equal to "alice" and if so then set variable "correctName" to true and if not then set name to the value of cell (2, name) :, _(*4)

  if (name = "alice")
  then let correctName = true
  else then let name = #(2, name)
  

• Another example if statement. Notice how & and 'and' can be used in the exact same way and will produce the same result. The return keyword returns the result of the function : if (name = "alice" & age = 22) then return 1 else if (name = "bob" and age = 23) then return 2 else then return 0 If there are any errors in the function code then it is output to the user, giving the type of error and the location of it also.