parser support anon iterators

compiler/parser.nim

@@ -990,7 +990,7 @@ proc primary(p: var TParser, mode: TPrimaryMode): PNode =
   of tkTuple: result = parseTuple(p, mode == pmTypeDef)
   of tkProc: result = parseProcExpr(p, mode notin {pmTypeDesc, pmTypeDef})
   of tkIterator:
-    when true:
+    when false:
       if mode in {pmTypeDesc, pmTypeDef}:
         result = parseProcExpr(p, false)
         result.kind = nkIteratorTy
@@ -1001,7 +1001,8 @@ proc primary(p: var TParser, mode: TPrimaryMode): PNode =
         result = ast.emptyNode
     else:
       result = parseProcExpr(p, mode notin {pmTypeDesc, pmTypeDef})
-      result.kind = nkIteratorTy
+      if result.kind == nkLambda: result.kind = nkIteratorDef
+      else: result.kind = nkIteratorTy
   of tkEnum:
     if mode == pmTypeDef:
       result = parseEnum(p)

compiler/semstmts.nim

@@ -922,7 +922,7 @@ proc activate(c: PContext, n: PNode) =
     of nkCallKinds:
       for i in 1 .. <n.len: activate(c, n[i])
     else:
-      nil
+      discard
 
 proc maybeAddResult(c: PContext, s: PSym, n: PNode) =
   if s.typ.sons[0] != nil and
@@ -951,7 +951,11 @@ proc semProcAux(c: PContext, n: PNode, kind: TSymKind,
   var typeIsDetermined = false
   if n[namePos].kind != nkSym:
     assert phase == stepRegisterSymbol
-    s = semIdentDef(c, n.sons[0], kind)
+
+    if n[namePos].kind == nkEmpty:
+      s = newSym(kind, idAnon, getCurrOwner(), n.info)
+    else:
+      s = semIdentDef(c, n.sons[0], kind)
     n.sons[namePos] = newSymNode(s)
     s.ast = n
     s.scope = c.currentScope

lib/core/macros.nim

@@ -300,9 +300,12 @@ when not defined(booting):
     ## that should be inserted verbatim in the program
     ## Example:
     ##
+    ## .. code-block:: nimrod
     ##   emit("echo " & '"' & "hello world".toUpper & '"')
     ##
-    eval: result = e.parseStmt
+    macro payload: stmt {.gensym.} =
+      result = e.parseStmt
+    payload()
 
 proc expectKind*(n: PNimrodNode, k: TNimrodNodeKind) {.compileTime.} =
   ## checks that `n` is of kind `k`. If this is not the case,
@@ -645,10 +648,13 @@ iterator children*(n: PNimrodNode): PNimrodNode {.inline.}=
   for i in 0 .. high(n):
     yield n[i]
 
-template findChild*(n: PNimrodNode; cond: expr): PNimrodNode {.immediate, dirty.} =
-  ## Find the first child node matching condition (or nil)
-  ## var res = findChild(n, it.kind == nnkPostfix and it.basename.ident == !"foo")
-  
+template findChild*(n: PNimrodNode; cond: expr): PNimrodNode {.
+  immediate, dirty.} =
+  ## Find the first child node matching condition (or nil).
+  ## 
+  ## .. code-block:: nimrod
+  ##   var res = findChild(n, it.kind == nnkPostfix and
+  ##                          it.basename.ident == !"foo")
   block:
     var result: PNimrodNode
     for it in n.children:
@@ -736,6 +742,6 @@ proc addIdentIfAbsent*(dest: PNimrodNode, ident: string) {.compiletime.} =
       if ident.eqIdent($node): return
     of nnkExprColonExpr:
       if ident.eqIdent($node[0]): return
-    else: nil
+    else: discard
   dest.add(ident(ident))
 

tests/macros/tmemit.nim

@@ -0,0 +1,7 @@
+discard """
+  out: '''HELLO WORLD'''
+"""
+
+import macros, strutils
+
+emit("echo " & '"' & "hello world".toUpper & '"')

tests/parser/tdomulttest.nim

@@ -0,0 +1,17 @@
+discard """
+  file: "tdomulttest.nim"
+  output: "555\ntest\nmulti lines\n99999999\nend"
+  disabled: true
+"""
+proc foo(bar, baz: proc (x: int): int) =
+  echo bar(555)
+  echo baz(99999999)
+
+foo do (x: int) -> int:
+  return x
+do (x: int) -> int:
+  echo("test")
+  echo("multi lines")
+  return x
+
+echo("end")

tests/parser/tinvwhen.nim

@@ -0,0 +1,15 @@
+discard """
+  file: "tinvwhen.nim"
+  line: 11
+  errormsg: "invalid indentation"
+"""
+# This was parsed even though it should not!
+
+proc chdir(path: cstring): cint {.importc: "chdir", header: "dirHeader".}
+
+proc getcwd(buf: cstring, buflen: cint): cstring
+    when defined(unix): {.importc: "getcwd", header: "<unistd.h>".} #ERROR_MSG invalid indentation
+    elif defined(windows): {.importc: "getcwd", header: "<direct.h>"}
+    else: {.error: "os library not ported to your OS. Please help!".}
+
+

todo.txt

@@ -6,6 +6,7 @@ version 0.9.4
 - ensure (ref T)(a, b) works as a type conversion and type constructor
 - document new templating symbol binding rules
 - make '--implicitStatic:on' the default
+- change comment handling in the AST
 
 - special rule for ``[]=``
 - ``=`` should be overloadable; requires specialization for ``=``; general
@@ -27,8 +28,6 @@ Bugs
 - docgen: sometimes effects are listed twice
 - 'result' is not properly cleaned for NRVO --> use uninit checking instead
 - sneaking with qualifiedLookup() is really broken!
-- aporia.nim(968, 5) Error: ambiguous identifier: 'DELETE' -- 
-  use a qualifier
 - blocks can "export" an identifier but the CCG generates {} for them ...
 - osproc execProcesses can deadlock if all processes fail (as experienced
   in c++ mode)
@@ -54,7 +53,6 @@ version 0.9.X
 - implement the missing features wrt inheritance
 - better support for macros that rewrite procs
 - macros need access to types and symbols (partially implemented)
-- perhaps: change comment handling in the AST
 - enforce 'simpleExpr' more often --> doesn't work; tkProc is
   part of primary!
 - the typeDesc/expr unification is weird and only necessary because of