summary refs log tree commit diff stats
path: root/tests/reject/t99bott.nim
blob: 7ebfd61e9c8b094f5fc6099d4cb7b2c688983541 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
discard """
  file: "t99bott.nim"
  line: 26
  errormsg: "constant expression expected"
  disabled: false
"""
## 99 Bottles of Beer
## http://www.99-bottles-of-beer.net/
## Nimrod version

## Author: Philippe Lhoste <PhiLho(a)GMX.net> http://Phi.Lho.free.fr
# 2012-11-25
# Loosely based on my old Lua version... Updated to current official lyrics.

proc GetBottleNumber(n: int): string =
  var bs: string
  if n == 0:
    bs = "No more bottles"
  elif n == 1:
    bs = "1 bottle"
  else:
    bs = $n & " bottles"
  return bs & " of beer"

for bn in countdown(99, 1):
  const cur = GetBottleNumber(bn)
  echo(cur, " on the wall, ", cur, ".")
  echo("Take one down and pass it around, ", GetBottleNumber(bn-1), 
       " on the wall.\n")

echo "No more bottles of beer on the wall, no more bottles of beer."
echo "Go to the store and buy some more, 99 bottles of beer on the wall."
t .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
#
#
#           The Nimrod Compiler
#        (c) Copyright 2012 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#

# This module implements the instantiation of generic procs.
# included from sem.nim

proc instantiateGenericParamList(c: PContext, n: PNode, pt: TIdTable,
                                 entry: var TInstantiatedSymbol) = 
  if n.kind != nkGenericParams: 
    InternalError(n.info, "instantiateGenericParamList; no generic params")
  newSeq(entry.concreteTypes, n.len)
  for i in countup(0, n.len - 1):
    var a = n.sons[i]
    if a.kind != nkSym: 
      InternalError(a.info, "instantiateGenericParamList; no symbol")
    var q = a.sym
    if q.typ.kind notin {tyTypeDesc, tyGenericParam}: continue 
    var s = newSym(skType, q.name, getCurrOwner())
    s.info = q.info
    s.flags = s.flags + {sfUsed, sfFromGeneric}
    var t = PType(IdTableGet(pt, q.typ))
    if t == nil:
      LocalError(a.info, errCannotInstantiateX, s.name.s)
      break
    if t.kind == tyGenericParam: 
      InternalError(a.info, "instantiateGenericParamList: " & q.name.s)
    elif t.kind == tyGenericInvokation:
      #t = instGenericContainer(c, a, t)
      t = generateTypeInstance(c, pt, a, t)
      #t = ReplaceTypeVarsT(cl, t)
    s.typ = t
    addDecl(c, s)
    entry.concreteTypes[i] = t

proc sameInstantiation(a, b: TInstantiatedSymbol): bool =
  if a.genericSym.id == b.genericSym.id and 
      a.concreteTypes.len == b.concreteTypes.len:
    for i in 0 .. < a.concreteTypes.len:
      if not sameType(a.concreteTypes[i], b.concreteTypes[i]): return
    result = true

proc GenericCacheGet(c: PContext, entry: var TInstantiatedSymbol): PSym = 
  for i in countup(0, Len(c.generics.generics) - 1):
    if sameInstantiation(entry, c.generics.generics[i]):
      result = c.generics.generics[i].instSym
      # checking for the concrete parameter list is wrong and unnecessary!
      #if equalParams(b.typ.n, instSym.typ.n) == paramsEqual:
      #echo "found in cache: ", getProcHeader(result)
      return

proc removeDefaultParamValues(n: PNode) = 
  # we remove default params, because they cannot be instantiated properly
  # and they are not needed anyway for instantiation (each param is already
  # provided).
  when false:
    for i in countup(1, sonsLen(n)-1): 
      var a = n.sons[i]
      if a.kind != nkIdentDefs: IllFormedAst(a)
      var L = a.len
      if a.sons[L-1].kind != nkEmpty and a.sons[L-2].kind != nkEmpty:
        # ``param: typ = defaultVal``. 
        # We don't need defaultVal for semantic checking and it's wrong for
        # ``cmp: proc (a, b: T): int = cmp``. Hm, for ``cmp = cmp`` that is
        # not possible... XXX We don't solve this issue here.
        a.sons[L-1] = ast.emptyNode

proc instantiateBody(c: PContext, n: PNode, result: PSym) =
  if n.sons[bodyPos].kind != nkEmpty:
    # add it here, so that recursive generic procs are possible:
    addDecl(c, result)
    pushProcCon(c, result)
    if result.kind in {skProc, skMethod, skConverter}: 
      addResult(c, result.typ.sons[0], n.info, result.kind)
      addResultNode(c, n)
    var b = semStmtScope(c, n.sons[bodyPos])
    # XXX Bad hack for tests/titer2 and tests/tactiontable
    n.sons[bodyPos] = transform(c.module, b)
    #echo "code instantiated ", result.name.s
    excl(result.flags, sfForward)
    popProcCon(c)

proc fixupInstantiatedSymbols(c: PContext, s: PSym) =
  for i in countup(0, Len(c.generics.generics) - 1):
    if c.generics.generics[i].genericSym.id == s.id:
      var oldPrc = c.generics.generics[i].instSym
      pushInfoContext(oldPrc.info)
      openScope(c.tab)
      var n = oldPrc.ast
      n.sons[bodyPos] = copyTree(s.getBody)
      if n.sons[paramsPos].kind != nkEmpty: 
        addParams(c, oldPrc.typ.n, oldPrc.kind)
      instantiateBody(c, n, oldPrc)
      closeScope(c.tab)
      popInfoContext()

proc sideEffectsCheck(c: PContext, s: PSym) = 
  if {sfNoSideEffect, sfSideEffect} * s.flags ==
      {sfNoSideEffect, sfSideEffect}: 
    LocalError(s.info, errXhasSideEffects, s.name.s)
  elif sfThread in s.flags and semthreads.needsGlobalAnalysis() and 
      s.ast.sons[genericParamsPos].kind == nkEmpty:
    c.threadEntries.add(s)

template nimdbg: expr = c.filename.endsWith"nimdbg.nim"

proc applyConcreteTypesToSig(genericProc: PSym, concTypes: seq[PType]): PType =
  # XXX: This is intended to replace the use of semParamList in generateInstance.
  # The results of semParamList's analysis are already encoded in the original
  # proc type and any concrete types may be aplied directly over it.
  # Besides being more efficient, it will remove the awkward case of
  # genericParams == nil in semParamList.
  # Currenly, it fails in some cases such as:
  # proc inc2*[T](x: var ordinal[T], y = 1) {.magic: "Inc", noSideEffect.}
  let sig = genericProc.typ
  result = copyType(sig, getCurrOwner(), false)
  result.n = sig.n.shallowCopy
  
  for i in countup(0, sig.len - 1):
    let tOrig = sig.sons[i]
    if tOrig == nil: continue        
    let oGenParams = genericProc.ast.sons[genericParamsPos]
    if skipTypes(tOrig, skipPtrs).kind in {tyGenericParam}:
      var tConcrete = concTypes[tOrig.sym.position]
      if i > 0:
        let param = sig.n.sons[i].sym.copySym
        param.typ = tConcrete
        result.n.sons[i] = newSymNode(param)
      result.sons[i] = tConcrete
    else:
      result.sons[i] = tOrig
      if i > 0: result.n.sons[i] = sig.n.sons[i]

proc generateInstance(c: PContext, fn: PSym, pt: TIdTable, 
                      info: TLineInfo): PSym = 
  # generates an instantiated proc
  if c.InstCounter > 1000: InternalError(fn.ast.info, "nesting too deep")
  inc(c.InstCounter)
  # NOTE: for access of private fields within generics from a different module
  # we set the friend module:
  var oldFriend = c.friendModule
  c.friendModule = getModule(fn)
  result = copySym(fn, false)
  incl(result.flags, sfFromGeneric)
  result.owner = getCurrOwner().owner
  # careful! we copy the whole AST including the possibly nil body!
  var n = copyTree(fn.ast)
  result.ast = n
  pushOwner(result)
  openScope(c.tab)
  if n.sons[genericParamsPos].kind == nkEmpty: 
    InternalError(n.info, "generateInstance")
  n.sons[namePos] = newSymNode(result)
  pushInfoContext(info)
  var entry: TInstantiatedSymbol
  entry.instSym = result
  entry.genericSym = fn
  instantiateGenericParamList(c, n.sons[genericParamsPos], pt, entry)
  n.sons[genericParamsPos] = ast.emptyNode
  # semantic checking for the parameters:
  if n.sons[paramsPos].kind != nkEmpty:
    if false and nimdbg:
      result.typ = applyConcreteTypesToSig(fn, entry.concreteTypes)
      addParams(c, result.typ.n, fn.kind)
    else:
      removeDefaultParamValues(n.sons[ParamsPos])
      semParamList(c, n.sons[ParamsPos], nil, result)
  else:
    result.typ = newTypeS(tyProc, c)
    addSon(result.typ, nil)
  result.typ.callConv = fn.typ.callConv
  ParamsTypeCheck(c, result.typ)
  var oldPrc = GenericCacheGet(c, entry)
  if oldPrc == nil:
    c.generics.generics.add(entry)
    if n.sons[pragmasPos].kind != nkEmpty:
      pragma(c, result, n.sons[pragmasPos], allRoutinePragmas)
    if isNil(n.sons[bodyPos]):
      n.sons[bodyPos] = copyTree(fn.getBody)
    instantiateBody(c, n, result)
    sideEffectsCheck(c, result)
  else:
    result = oldPrc
  popInfoContext()
  closeScope(c.tab)           # close scope for parameters
  popOwner()
  c.friendModule = oldFriend
  dec(c.InstCounter)
  
proc instGenericContainer(c: PContext, n: PNode, header: PType): PType = 
  var cl: TReplTypeVars
  InitIdTable(cl.symMap)
  InitIdTable(cl.typeMap)
  cl.info = n.info
  cl.c = c
  result = ReplaceTypeVarsT(cl, header)