#
#
# 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 compiler/pluginsupport, compiler/ast, compiler/astalgo,
compiler/magicsys, compiler/lookups, compiler/semdata,
compiler/lambdalifting, compiler/rodread, compiler/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(iter.info, "first argument needs to be an iterator")
return
if n[2].typ.isNil:
localError(n[2].info, "second argument needs to be a type")
return
if n[3].kind != nkIdent:
localError(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.lastSon.kind != tyObject:
localError(n[2].info,
"type must be a non-generic ref|ptr to object with state field")
return
let body = liftIterToProc(iter.sym, iter.sym.getBody, t)
let prc = newSym(skProc, n[3].ident, iter.sym.owner, iter.sym.info)
prc.typ = copyType(iter.sym.typ, prc, false)
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,
name = newSymNode(prc),
params = orig[paramsPos],
pragmas = orig[pragmasPos],
body = body)
prc.ast.add iter.sym.ast.sons[resultPos]
addInterfaceDecl(c, prc)
registerPlugin("stdlib", "system", "iterToProc", iterToProcImpl)