1 files changed, 46 insertions, 0 deletions
diff --git a/compiler/plugins/itersgen.nim b/compiler/plugins/itersgen.nim
new file mode 100644
index 000000000..e2c97bdc5
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+++ b/compiler/plugins/itersgen.nim
@@ -0,0 +1,46 @@
+#
+#
+#           The Nim Compiler
+#        (c) Copyright 2015 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## Plugin to transform an inline iterator into a data structure.
+
+import ".." / [ast, modulegraphs, lookups, semdata, lambdalifting, msgs]
+
+proc iterToProcImpl*(c: PContext, n: PNode): PNode =
+  result = newNodeI(nkStmtList, n.info)
+  let iter = n[1]
+  if iter.kind != nkSym or iter.sym.kind != skIterator:
+    localError(c.config, iter.info, "first argument needs to be an iterator")
+    return
+  if n[2].typ.isNil:
+    localError(c.config, n[2].info, "second argument needs to be a type")
+    return
+  if n[3].kind != nkIdent:
+    localError(c.config, n[3].info, "third argument needs to be an identifier")
+    return
+
+  let t = n[2].typ.skipTypes({tyTypeDesc, tyGenericInst})
+  if t.kind notin {tyRef, tyPtr} or t.elementType.kind != tyObject:
+    localError(c.config, n[2].info,
+        "type must be a non-generic ref|ptr to object with state field")
+    return
+  let body = liftIterToProc(c.graph, iter.sym, getBody(c.graph, iter.sym), t, c.idgen)
+
+  let prc = newSym(skProc, n[3].ident, c.idgen, iter.sym.owner, iter.sym.info)
+  prc.typ = copyType(iter.sym.typ, c.idgen, prc)
+  excl prc.typ.flags, tfCapturesEnv
+  prc.typ.n.add newSymNode(getEnvParam(iter.sym))
+  prc.typ.rawAddSon t
+  let orig = iter.sym.ast
+  prc.ast = newProcNode(nkProcDef, n.info,
+              body = body, params = orig[paramsPos], name = newSymNode(prc),
+              pattern = c.graph.emptyNode, genericParams = c.graph.emptyNode,
+              pragmas = orig[pragmasPos], exceptions = c.graph.emptyNode)
+
+  prc.ast.add iter.sym.ast[resultPos]
+  addInterfaceDecl(c, prc)