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term rewriting macros fully implemented; still buggy

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This commit is contained in:
Araq 2012-09-03 00:55:44 +02:00
commit af7c92c003
22 changed files with 676 additions and 138 deletions
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16
compiler/trees.nim
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@ -151,3 +151,19 @@ proc whichPragma*(n: PNode): TSpecialWord =
let key = if n.kind == nkExprColonExpr: n.sons[0] else: n
if key.kind == nkIdent: result = whichKeyword(key.ident)
proc unnestStmts(n, result: PNode) =
if n.kind == nkStmtList:
for x in items(n): unnestStmts(x, result)
elif n.kind notin {nkCommentStmt, nkNilLit}:
result.add(n)
proc flattenStmts*(n: PNode): PNode =
## flattens a nested statement list; used for pattern matching
result = newNodeI(nkStmtList, n.info)
unnestStmts(n, result)
if result.len == 1:
result = result.sons[0]
proc extractRange*(k: TNodeKind, n: PNode, a, b: int): PNode =
result = newNodeI(k, n.info, b-a+1)
for i in 0 .. b-a: result.sons[i] = n.sons[i+a]