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macros and templates can be expanded anywhere where a type is expected.

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This allows for various type selection algorithms to be implemented.
See tests / accept / compile / ttypeselectors.nim for examples.
This commit is contained in:
Zahary Karadjov 2011-11-16 02:18:10 +02:00
commit 12bac28d23
6 changed files with 119 additions and 36 deletions
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15
compiler/semstmts.nim
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@ -12,8 +12,15 @@
proc semCommand(c: PContext, n: PNode): PNode =
result = semExprNoType(c, n)
proc semWhen(c: PContext, n: PNode): PNode =
proc semWhen(c: PContext, n: PNode, semCheck = true): PNode =
# If semCheck is set to false, ``when`` will return the verbatim AST of
# the correct branch. Otherwise the AST will be passed through semStmt.
result = nil
template set_result(e: expr) =
if semCheck: result = semStmt(c, e) # do not open a new scope!
else: result = e
for i in countup(0, sonsLen(n) - 1):
var it = n.sons[i]
case it.kind
@ -21,12 +28,12 @@ proc semWhen(c: PContext, n: PNode): PNode =
checkSonsLen(it, 2)
var e = semAndEvalConstExpr(c, it.sons[0])
if (e.kind != nkIntLit): InternalError(n.info, "semWhen")
if (e.intVal != 0) and (result == nil):
result = semStmt(c, it.sons[1]) # do not open a new scope!
if (e.intVal != 0) and (result == nil):
set_result(it.sons[1])
of nkElse:
checkSonsLen(it, 1)
if result == nil:
result = semStmt(c, it.sons[0]) # do not open a new scope!
set_result(it.sons[0])
else: illFormedAst(n)
if result == nil:
result = newNodeI(nkNilLit, n.info)