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+\documentclass{article}
+\usepackage{axiom}
+
+\title{\File{src/interp/info.boot} Pamphlet}
+\author{The Axiom Team}
+
+\begin{document}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+
+\begin{verbatim}
+ADDINFORMATION CODE
+This code adds various items to the special value of $Information,
+in order to keep track of all the compiler's information about
+various categories and similar objects
+An actual piece of (unconditional) information can have one of 3 forms:
+ (ATTRIBUTE domainname attribute)
+             --These are only stored here
+ (SIGNATURE domainname operator signature)
+             --These are also stored as 'modemap' properties
+ (has domainname categoryexpression)
+             --These are also stored as 'value' properties
+Conditional attributes are of the form
+ (COND
+ (condition info info ...)
+ ... )
+where the condition looks like a 'has' clause, or the 'and' of several
+'has' clauses:
+  (has name categoryexpression)
+  (has name (ATTRIBUTE attribute))
+  (has name (SIGNATURE operator signature))
+The use of two representations is admitted to be clumsy
+ 
+\end{verbatim}
+\section{License}
+<<license>>=
+-- 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.
+
+@
+<<*>>=
+<<license>>
+
+printInfo $e ==
+  for u in get("$Information","special",$e) repeat PRETTYPRINT u
+  nil
+ 
+addInformation(m,$e) ==
+  $Information: local
+  --$Information:= nil: done by previous statement anyway
+  info m where
+    info m ==
+      --Processes information from a mode declaration in compCapsule
+      atom m => nil
+      m is ["CATEGORY",.,:stuff] => for u in stuff repeat addInfo u
+      m is ["Join",:stuff] => for u in stuff repeat info u
+      nil
+  $e:=
+    put("$Information","special",[:$Information,:
+      get("$Information","special",$e)],$e)
+  $e
+ 
+addInfo u == $Information:= [formatInfo u,:$Information]
+ 
+formatInfo u ==
+  atom u => u
+  u is ["SIGNATURE",:v] => ["SIGNATURE","$",:v]
+ --u is ("CATEGORY",junk,:l) => ("PROGN",:(formatInfo v for v in l))
+  u is ["PROGN",:l] => ["PROGN",:[formatInfo v for v in l]]
+  u is ["ATTRIBUTE",v] =>
+ 
+    -- The parser can't tell between those attributes that really
+    -- are attributes, and those that are category names
+    atom v and isCategoryForm([v],$e) => ["has","$",[v]]
+    atom v => ["ATTRIBUTE","$",v]
+    isCategoryForm(v,$e) => ["has","$",v]
+    ["ATTRIBUTE","$",v]
+  u is ["IF",a,b,c] =>
+    c="noBranch" => ["COND",:liftCond [formatPred a,formatInfo b]]
+    b="noBranch" => ["COND",:liftCond [["not",formatPred a],formatInfo c]]
+    ["COND",:liftCond [formatPred a,formatInfo b],:
+      liftCond [["not",formatPred a],formatInfo c]]
+  systemError '"formatInfo"
+ 
+liftCond (clause is [ante,conseq]) ==
+  conseq is ["COND",:l] =>
+    [[lcAnd(ante,a),:b] for [a,:b] in l] where
+      lcAnd(pred,conj) ==
+        conj is ["and",:ll] => ["and",pred,:ll]
+        ["and",pred,conj]
+  [clause]
+ 
+formatPred u ==
+         --Assumes that $e is set up to point to an environment
+  u is ["has",a,b] =>
+    atom b and isCategoryForm([b],$e) => ["has",a,[b]]
+    atom b => ["has",a,["ATTRIBUTE",b]]
+    isCategoryForm(b,$e) => u
+    b is ["ATTRIBUTE",.] => u
+    b is ["SIGNATURE",:.] => u
+    ["has",a,["ATTRIBUTE",b]]
+  atom u => u
+  u is ["and",:v] => ["and",:[formatPred w for w in v]]
+  systemError '"formatPred"
+ 
+chaseInferences(pred,$e) ==
+  foo hasToInfo pred where
+    foo pred ==
+      knownInfo pred => nil
+      $e:= actOnInfo(pred,$e)
+      pred:= infoToHas pred
+      for u in get("$Information","special",$e) repeat
+        u is ["COND",:l] =>
+          for [ante,:conseq] in l repeat
+            ante=pred => [foo w for w in conseq]
+            ante is ["and",:ante'] and member(pred,ante') =>
+              ante':= delete(pred,ante')
+              v':=
+                LENGTH ante'=1 => first ante'
+                ["and",:ante']
+              v':= ["COND",[v',:conseq]]
+              member(v',get("$Information","special",$e)) => nil
+              $e:=
+                put("$Information","special",[v',:
+                  get("$Information","special",$e)],$e)
+            nil
+  $e
+ 
+hasToInfo (pred is ["has",a,b]) ==
+  b is ["SIGNATURE",:data] => ["SIGNATURE",a,:data]
+  b is ["ATTRIBUTE",c] => ["ATTRIBUTE",a,c]
+  pred
+ 
+infoToHas a ==
+  a is ["SIGNATURE",b,:data] => ["has",b,["SIGNATURE",:data]]
+  a is ["ATTRIBUTE",b,c] => ["has",b,["ATTRIBUTE",c]]
+  a
+ 
+knownInfo pred ==
+               --true %if the information is already known
+  pred=true => true
+  --pred = "true" => true
+  member(pred,get("$Information","special",$e)) => true
+  pred is ["OR",:l] => or/[knownInfo u for u in l]
+  pred is ["AND",:l] => and/[knownInfo u for u in l]
+  pred is ["or",:l] => or/[knownInfo u for u in l]
+  pred is ["and",:l] => and/[knownInfo u for u in l]
+  pred is ["ATTRIBUTE",name,attr] =>
+    v:= compForMode(name,$EmptyMode,$e)
+    null v => stackSemanticError(["can't find category of ",name],nil)
+    [vv,.,.]:= compMakeCategoryObject(CADR v,$e)
+    null vv => stackSemanticError(["can't make category of ",name],nil)
+    member(attr,vv.2) => true
+    x:= ASSOC(attr,vv.2) => knownInfo CADR x
+          --format is a list of two elements: information, predicate
+    false
+  pred is ["has",name,cat] =>
+    cat is ["ATTRIBUTE",:a] => knownInfo ["ATTRIBUTE",name,:a]
+    cat is ["SIGNATURE",:a] => knownInfo ["SIGNATURE",name,:a]
+    name is ['Union,:.] => false
+    v:= compForMode(name,$EmptyMode,$e)
+    null v => stackSemanticError(["can't find category of ",name],nil)
+    vmode := CADR v
+    cat = vmode => true
+    vmode is ["Join",:l] and member(cat,l) => true
+    [vv,.,.]:= compMakeCategoryObject(vmode,$e)
+    catlist := vv.4
+    --catlist := SUBST(name,'$,vv.4)
+    null vv => stackSemanticError(["can't make category of ",name],nil)
+    member(cat,first catlist) => true  --checks princ. ancestors
+    (u:=ASSOC(cat,CADR catlist)) and knownInfo(CADR u) => true
+    -- previous line checks fundamental anscestors, we should check their
+    --   principal anscestors but this requires instantiating categories
+
+    -- This line caused recursion on predicates which are no use in deciding
+    -- whether a category was present.
+-- this is correct TPD feb, 19, 2003
+    or/[AncestorP(cat,LIST CAR u) for u in CADR catlist | knownInfo CADR u] => true
+-- this is wrong TPD feb, 19, 2003
+    -- or/[AncestorP(cat,LIST CAR u) and knownInfo CADR u for u in CADR catlist] => true
+    false
+  pred is ["SIGNATURE",name,op,sig,:.] =>
+    v:= get(op,"modemap",$e)
+    for w in v repeat
+      ww:= CDAR w
+          --the actual signature part
+      LENGTH ww=LENGTH sig and SourceLevelSubsume(ww,sig) =>
+        --NULL CAADR w => return false
+        CAADR w  = true => return true
+        --return false
+        --error '"knownInfo"
+  false
+ 
+--------------------> NEW DEFINITION (override in xruncomp.boot.pamphlet)
+actOnInfo(u,$e) ==
+  null u => $e
+  u is ["PROGN",:l] => (for v in l repeat $e:= actOnInfo(v,$e); $e)
+  $e:=
+    put("$Information","special",Info:= [u,:get("$Information","special",$e)],$e
+      )
+  u is ["COND",:l] =>
+      --there is nowhere %else that this sort of thing exists
+    for [ante,:conseq] in l repeat
+      if member(hasToInfo ante,Info) then for v in conseq repeat
+        $e:= actOnInfo(v,$e)
+    $e
+  u is ["ATTRIBUTE",name,att] =>
+    [vval,vmode,venv]:= GetValue name
+    SAY("augmenting ",name,": ",u)
+    key:= if CONTAINED("$",vmode) then "domain" else name
+    cat:= ["CATEGORY",key,["ATTRIBUTE",att]]
+    $e:= put(name,"value",[vval,mkJoin(cat,vmode),venv],$e)
+      --there is nowhere %else that this sort of thing exists
+  u is ["SIGNATURE",name,operator,modemap] =>
+    implem:=
+      (implem:=ASSOC([name,:modemap],get(operator,'modemap,$e))) =>
+          CADADR implem
+      ['ELT,name,nil]
+    $e:= addModemap(operator,name,modemap,true,implem,$e)
+    [vval,vmode,venv]:= GetValue name
+    SAY("augmenting ",name,": ",u)
+    key:= if CONTAINED("$",vmode) then "domain" else name
+    cat:= ["CATEGORY",key,["SIGNATURE",operator,modemap]]
+    $e:= put(name,"value",[vval,mkJoin(cat,vmode),venv],$e)
+  u is ["has",name,cat] =>
+    [vval,vmode,venv]:= GetValue name
+    cat=vmode => $e --stating the already known
+    u:= compMakeCategoryObject(cat,$e) =>
+         --we are adding information about a category
+      [catvec,.,$e]:= u
+      [ocatvec,.,$e]:= compMakeCategoryObject(vmode,$e)
+      -- member(vmode,CAR catvec.4) =>
+      --    JHD 82/08/08 01:40 This does not mean that we can ignore the
+      --    extension, since this may not be compatible with the view we
+      --    were passed
+ 
+      --we are adding a principal descendant of what was already known
+      --    $e:= augModemapsFromCategory(name,name,nil,catvec,$e)
+      --    SAY("augmenting ",name,": ",cat)
+      --    put(name, "value", (vval, cat, venv), $e)
+      member(cat,first ocatvec.4) or
+         ASSOC(cat,CADR ocatvec.4) is [.,'T,.] => $e
+        --SAY("Category extension error:
+        --cat shouldn't be a join
+                      --what was being asserted is an ancestor of what was known
+      if name="$"
+        then $e:= augModemapsFromCategory(name,name,name,cat,$e)
+        else
+          viewName:=genDomainViewName(name,cat)
+          genDomainView(viewName,name,cat,"HasCategory")
+          if not MEMQ(viewName,$functorLocalParameters) then
+             $functorLocalParameters:=[:$functorLocalParameters,viewName]
+      SAY("augmenting ",name,": ",cat)
+      $e:= put(name,"value",[vval,mkJoin(cat,vmode),venv],$e)
+    SAY("extension of ",vval," to ",cat," ignored")
+    $e
+  systemError '"knownInfo"
+ 
+mkJoin(cat,mode) ==
+  mode is ['Join,:cats] => ['Join,cat,:cats]
+  ['Join,cat,mode]
+ 
+GetValue name ==
+  u:= get(name,"value",$e) => u
+  u:= comp(name,$EmptyMode,$e) => u  --name may be a form
+  systemError [name,'" is not bound in the current environment"]
+ 
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}