all repos — min @ 638cb7ac58499c87dcd1a0d232e68bb831f90a48

A small but practical concatenative programming language.

lib/min_stack.nim

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import tables
import 
  ../core/types,
  ../core/parser, 
  ../core/interpreter, 
  ../core/utils

  # Common stack operations
  

proc stack_module*(i: In) =
  i.define("stack")
  
    .symbol("id") do (i: In):
      discard
    
    .symbol("pop") do (i: In):
      if i.stack.len < 1:
        raiseEmptyStack()
      discard i.pop
    
    .symbol("dup") do (i: In):
      i.push i.peek
    
    .symbol("dip") do (i: In):
      var q: MinValue
      i.reqQuotation q
      let v = i.pop
      i.unquote("<dip>", q)
      i.push v
    
    .symbol("swap") do (i: In):
      if i.stack.len < 2:
        raiseEmptyStack()
      let a = i.pop
      let b = i.pop
      i.push a
      i.push b
    
    .symbol("sip") do (i: In):
      var a, b: MinValue 
      i.reqTwoQuotations a, b
      i.push b
      i.unquote("<sip>", a)
      i.push b
  
    .finalize()