remove pamphlets - part 3

1 files changed, 67 insertions, 0 deletions

diff --git a/src/interp/compress.boot b/src/interp/compress.boot
new file mode 100644
index 00000000..a9e41ac5
--- /dev/null
+++ b/src/interp/compress.boot
@@ -0,0 +1,67 @@
+-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions are
+-- met:
+--
+--     - Redistributions of source code must retain the above copyright
+--       notice, this list of conditions and the following disclaimer.
+--
+--     - Redistributions in binary form must reproduce the above copyright
+--       notice, this list of conditions and the following disclaimer in
+--       the documentation and/or other materials provided with the
+--       distribution.
+--
+--     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
+--       names of its contributors may be used to endorse or promote products
+--       derived from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+)package "BOOT"
+
+-- This one is not currently in general use, but can be applied
+-- to various situations are required
+ 
+minimalise x ==
+  $hash:local:=MAKE_-HASHTABLE 'UEQUAL
+  min x where
+    min x ==
+      y:=HGET($hash,x)
+      y => y
+      PAIRP x =>
+        x = '(QUOTE T) => '(QUOTE T)
+        -- copes with a particular Lucid-ism, God knows why
+        -- This circular way of doing things is an attempt to deal with Lucid
+        -- Who may place quoted cells in read-only memory
+        z:=min CAR x
+        if not EQ(z,CAR x) then RPLACA(x,z)
+        z:=min CDR x
+        if not EQ(z,CDR x) then RPLACD(x,z)
+        HashCheck x
+      REFVECP x =>
+        for i in 0..MAXINDEX x repeat
+          x.i:=min (x.i)
+        HashCheck x
+      STRINGP x => HashCheck x
+      x
+    HashCheck x ==
+      y:=HGET($hash,x)
+      y => y
+      HPUT($hash,x,x)
+      x
+  x
+ 
+