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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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45
compiler/semexprs.nim
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@ -400,10 +400,6 @@ proc isAssignable(c: PContext, n: PNode): TAssignableResult =
else:
nil
proc isCallExpr(n: PNode): bool =
result = n.kind in {nkCall, nkInfix, nkPrefix, nkPostfix, nkCommand,
nkCallStrLit}
proc newHiddenAddrTaken(c: PContext, n: PNode): PNode =
if n.kind == nkHiddenDeref:
checkSonsLen(n, 1)
@ -922,32 +918,35 @@ proc expectStringArg(c: PContext, n: PNode, i: int): PNode =
if result.kind notin {nkStrLit, nkRStrLit, nkTripleStrLit}:
GlobalError(result.info, errStringLiteralExpected)
proc semExpandToAst(c: PContext, n: PNode, magicSym: PSym,
proc expectMacroOrTemplateCall(c: PContext, n: PNode): PSym =
## The argument to the proc should be nkCall(...) or similar
## Returns the macro/template symbol
if not isCallExpr(n):
GlobalError(n.info, errXisNoMacroOrTemplate, n.renderTree)
var expandedSym = qualifiedLookup(c, n[0], {checkUndeclared})
if expandedSym == nil:
GlobalError(n.info, errUndeclaredIdentifier, n[0].renderTree)
if expandedSym.kind notin {skMacro, skTemplate}:
GlobalError(n.info, errXisNoMacroOrTemplate, expandedSym.name.s)
result = expandedSym
proc semExpandToAst(c: PContext, n: PNode, magicSym: PSym,
flags: TExprFlags): PNode =
if sonsLen(n) == 2:
if not isCallExpr(n.sons[1]):
GlobalError(n.info, errXisNoMacroOrTemplate, n.renderTree)
var macroCall = n[1]
var expandedSym = expectMacroOrTemplateCall(c, macroCall)
var macroCall = n.sons[1]
var expandedSym = qualifiedLookup(c, macroCall.sons[0], {checkUndeclared})
if expandedSym == nil:
GlobalError(n.info, errUndeclaredIdentifier, macroCall[0].renderTree)
if expandedSym.kind notin {skMacro, skTemplate}:
GlobalError(n.info, errXisNoMacroOrTemplate, expandedSym.name.s)
macroCall.sons[0] = newNodeI(nkSym, macroCall.info)
macroCall.sons[0].sym = expandedSym
macroCall.sons[0] = newSymNode(expandedSym, macroCall.info)
markUsed(n, expandedSym)
for i in countup(1, macroCall.len-1):
macroCall.sons[i] = semExprWithType(c, macroCall.sons[i], {efAllowType})
macroCall.sons[i] = semExprWithType(c, macroCall[i], {efAllowType})
# Preserve the magic symbol in order to handled in evals.nim
n.sons[0] = newNodeI(nkSym, n.info)
n.sons[0].sym = magicSym
# Preserve the magic symbol in order to be handled in evals.nim
n.sons[0] = newSymNode(magicSym, n.info)
n.typ = expandedSym.getReturnType
result = n
else: