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Better support for treating templates and macros as symbols.

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This allows you to pass a template or a macro to another macro
which can then inspect the implementation of the former template/macro
using `getImpl`.

Since templates can be freely redefined, this allows you to treat
their symbols as compile-time variables that have lexical scope.
A motivating PoC example for a logging library taking advantage of
this will be provided in the next commit.

Implementation details:

* The name of a template or a macro will be consider a symbol if
  the template/macro requires parameters

* For parameterless templates/macros, you can use `bindSym`, which
  was extended to also work outside of compile-time procs.
This commit is contained in:
Zahary Karadjov 2018-04-18 19:40:08 +03:00 • committed by Andreas Rumpf
commit bdcb729597
7 changed files with 202 additions and 8 deletions
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8
compiler/semexprs.nim
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@ -960,18 +960,20 @@ proc semSym(c: PContext, n: PNode, sym: PSym, flags: TExprFlags): PNode =
else:
result = newSymNode(s, n.info)
of skMacro:
if efNoEvaluateGeneric in flags and s.ast[genericParamsPos].len > 0:
if efNoEvaluateGeneric in flags and s.ast[genericParamsPos].len > 0 or
(n.kind notin nkCallKinds and s.requiredParams > 0):
markUsed(n.info, s, c.graph.usageSym)
styleCheckUse(n.info, s)
result = newSymNode(s, n.info)
result = symChoice(c, n, s, scClosed)
else:
result = semMacroExpr(c, n, n, s, flags)
of skTemplate:
if efNoEvaluateGeneric in flags and s.ast[genericParamsPos].len > 0 or
(n.kind notin nkCallKinds and s.requiredParams > 0) or
sfCustomPragma in sym.flags:
markUsed(n.info, s, c.graph.usageSym)
styleCheckUse(n.info, s)
result = newSymNode(s, n.info)
result = symChoice(c, n, s, scClosed)
else:
result = semTemplateExpr(c, n, s, flags)
of skParam: