From 499600fdff22b717a57aaee6934d1dbabe2723ef Mon Sep 17 00:00:00 2001
From: dos-reis <gdr@axiomatics.org>
Date: Thu, 13 Sep 2007 13:06:59 +0000
Subject: 	* Makefile.pamphlet (OBJS): Don't include ptrop.$(FASLEXT). 
 (ptrees.$(FASLEXT)): New rule. 	(cparse.$(FASLEXT)): Likewise. 	*
 ptrop.boot.pamphlet: Move content to ptrees.boot.pamphlet. 	*
 ptrees.boot.pamphlet: Import posit, serror. 	* cparse.boot: New. Import
 ptrees. 	* cparse.boot.pamphlet: Move content to cparse.boot.  Remove. 
 * serror.boot: New. 	(pfSourceStok): Move to posit.boot. 
 (npMissingMate): Move to cparse.boot. 	(npMissing): Likewise. 
 (npCompMissing): Likewise. 	(npRecorverTrap): Likewise. 
 (npListAndRecover): Likewise. 	(npMoveTo): Likewise. 	*
 serror.boot.pamphlet: Move content to serror.boot.  Remove.

---
 src/interp/ptrees.boot.pamphlet | 45 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

(limited to 'src/interp/ptrees.boot.pamphlet')

diff --git a/src/interp/ptrees.boot.pamphlet b/src/interp/ptrees.boot.pamphlet
index dea41bdc..414b09af 100644
--- a/src/interp/ptrees.boot.pamphlet
+++ b/src/interp/ptrees.boot.pamphlet
@@ -62,6 +62,9 @@ THE PFORM DATA STRUCTURE
 <<*>>=
 <<license>>
 
+import '"posit"
+import '"serror"
+
 )package "BOOT"
 
 --% SPECIAL NODES
@@ -741,7 +744,47 @@ pfFlattenApp x==
    [x]
 
 
-
+--% Utility operations on Abstract Syntax Trees
+ 
+-- An S-expression which people can read.
+pfSexpr pform ==
+    strip pform where
+         strip pform ==
+            pfId? pform       => pfIdSymbol pform
+            pfLiteral?  pform => pfLiteralString pform
+            pfLeaf? pform     => tokPart pform
+ 
+            pfApplication? pform =>
+                args :=
+                    a := pfApplicationArg pform
+                    if pfTuple? a then pf0TupleParts a else [a]
+                [strip p for p in cons(pfApplicationOp pform, args)]
+ 
+            cons(pfAbSynOp pform, [strip p for p in pfParts pform])
+ 
+pfCopyWithPos( pform , pos ) == 
+    pfLeaf? pform =>         pfLeaf( pfAbSynOp pform , tokPart pform , pos )
+    pfTree( pfAbSynOp pform , [ pfCopyWithPos( p , pos ) for p in pfParts pform ] )
+ 
+pfMapParts(f, pform) ==
+    pfLeaf? pform => pform
+    parts0 := pfParts pform
+    parts1 := [FUNCALL(f, p) for p in parts0]
+    -- Return the original if no changes.
+    same := true
+    for p0 in parts0 for p1 in parts1 while same repeat same := EQ(p0,p1)
+    same => pform
+    pfTree(pfAbSynOp pform, parts1)
+ 
+ 
+pf0ApplicationArgs pform ==
+    arg := pfApplicationArg pform
+    pf0FlattenSyntacticTuple arg
+ 
+pf0FlattenSyntacticTuple pform ==
+    not pfTuple? pform => [pform]
+    [:pf0FlattenSyntacticTuple p for p in pf0TupleParts pform]
+ 
 @
 \eject
 \begin{thebibliography}{99}
-- 
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