all repos — min @ 8c3abc2e6fe3de6a588bf5d11c8eaa01560a657b

A small but practical concatenative programming language.

lib/min_stack.nim

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import 
  tables,
  random
import 
  ../core/parser, 
  ../core/value, 
  ../core/interpreter, 
  ../core/utils
  
# Operations on the whole stack
proc stack_module*(i: In)=

  i.define()

    .symbol("clear-stack") do (i: In):
      while i.stack.len > 0:
        discard i.pop
  
    .symbol("get-stack") do (i: In):
      i.push i.stack.newVal(i.scope)
  
    .symbol("set-stack") do (i: In):
      var q: MinValue
      i.reqQuotation q
      i.stack = q.qVal
    
    .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(q)
      i.push v

    .symbol("nip") do (i: In):
      var a, b: MinValue
      a = i.pop
      b = i.pop
      i.push a
    
    .symbol("cleave") do (i: In):
      var q: MinValue
      i.reqQuotationOfQuotations q
      let v = i.pop
      for s in q.qVal:
        var s1 = s
        i.push v
        i.unquote(s1)
    
    .symbol("spread") do (i: In):
      var q: MinValue
      i.reqQuotationOfQuotations q
      var els = newSeq[MinValue](0)
      for el in 0..q.qVal.len-1:
        els.add i.pop
      var count = els.len-1
      for s in q.qVal:
        var s1 = s
        i.push els[count]
        i.unquote(s1)
        count.dec
    
    .symbol("keep") do (i: In):
      var q: MinValue
      i.reqQuotation q
      let v = i.pop
      i.push v
      i.unquote(q)
      i.push v
    
    .symbol("swap") do (i: In):
      i.reqStackSize 2
      let a = i.pop
      let b = i.pop
      i.push a
      i.push b

    .symbol("over") do (i: In):
      i.reqStackSize 2
      let a = i.pop
      let b = i.pop
      i.push b
      i.push a
      i.push b

    .symbol("pick") do (i: In):
      i.reqStackSize 3
      let a = i.pop
      let b = i.pop
      let c = i.pop
      i.push c
      i.push b
      i.push a
      i.push c

    .symbol("rollup") do (i: In):
      i.reqStackSize 3
      let first = i.pop
      let second = i.pop
      let third = i.pop
      i.push first
      i.push second
      i.push third

    .symbol("rolldown") do (i: In):
      i.reqStackSize 3
      let first = i.pop
      let second = i.pop
      let third = i.pop
      i.push second
      i.push first
      i.push third

    .symbol("cons") do (i: In):
      var q: MinValue
      i.reqQuotation q
      let v = i.pop
      q.qVal = @[v] & q.qVal
      i.push q

    .symbol("swons") do (i: In):
      i.push "swap".newSym
      i.push "cons".newSym
    
    .symbol("sip") do (i: In):
      var a, b: MinValue 
      i.reqTwoQuotations a, b
      i.push b
      i.unquote(a)
      i.push b
  
    .finalize("stack")