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implemented 'borrow dot' feature for distinct types

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This commit is contained in:
Araq 2014-03-26 01:27:22 +01:00
commit cdb4d83ead
3 changed files with 23 additions and 10 deletions
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19
compiler/pragmas.nim
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@ -52,7 +52,8 @@ const
typePragmas* = {wImportc, wExportc, wDeprecated, wMagic, wAcyclic, wNodecl,
wPure, wHeader, wCompilerproc, wFinal, wSize, wExtern, wShallow,
wImportCpp, wImportObjC, wError, wIncompleteStruct, wByCopy, wByRef,
wInheritable, wGensym, wInject, wRequiresInit, wUnchecked, wUnion, wPacked}
wInheritable, wGensym, wInject, wRequiresInit, wUnchecked, wUnion, wPacked,
wBorrow}
fieldPragmas* = {wImportc, wExportc, wDeprecated, wExtern,
wImportCpp, wImportObjC, wError}
varPragmas* = {wImportc, wExportc, wVolatile, wRegister, wThreadVar, wNodecl,
@ -511,6 +512,13 @@ proc pragmaRaisesOrTags(c: PContext, n: PNode) =
else:
invalidPragma(n)
proc typeBorrow(sym: PSym, n: PNode) =
if n.kind == nkExprColonExpr:
let it = n.sons[1]
if it.kind != nkAccQuoted:
localError(n.info, "a type can only borrow `.` for now")
incl(sym.typ.flags, tfBorrowDot)
proc singlePragma(c: PContext, sym: PSym, n: PNode, i: int,
validPragmas: TSpecialWords): bool =
var it = n.sons[i]
@ -631,9 +639,12 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: int,
noVal(it)
if sym.typ == nil: invalidPragma(it)
else: incl(sym.typ.flags, tfVarargs)
of wBorrow:
noVal(it)
incl(sym.flags, sfBorrow)
of wBorrow:
if sym.kind == skType:
typeBorrow(sym, it)
else:
noVal(it)
incl(sym.flags, sfBorrow)
of wFinal:
noVal(it)
if sym.typ == nil: invalidPragma(it)