forked from lix-project/lix
* Obsolete.
This commit is contained in:
Eelco Dolstra
parent
55e11bc0d3
commit
08719c6c97
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#include "fix-expr.hh"
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#include "expr.hh"
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ATermMap::ATermMap(unsigned int initialSize, unsigned int maxLoadPct)
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{
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table = ATtableCreate(initialSize, maxLoadPct);
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if (!table) throw Error("cannot create ATerm table");
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}
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ATermMap::ATermMap(const ATermMap & map)
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: table(0)
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{
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ATermList keys = map.keys();
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/* !!! adjust allocation for load pct */
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table = ATtableCreate(ATgetLength(keys), map.maxLoadPct);
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if (!table) throw Error("cannot create ATerm table");
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for (ATermIterator i(keys); i; ++i)
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set(*i, map.get(*i));
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}
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ATermMap::~ATermMap()
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{
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if (table) ATtableDestroy(table);
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}
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void ATermMap::set(ATerm key, ATerm value)
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{
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return ATtablePut(table, key, value);
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}
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void ATermMap::set(const string & key, ATerm value)
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{
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set(string2ATerm(key), value);
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}
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ATerm ATermMap::get(ATerm key) const
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{
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return ATtableGet(table, key);
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}
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ATerm ATermMap::get(const string & key) const
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{
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return get(string2ATerm(key));
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}
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void ATermMap::remove(ATerm key)
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{
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ATtableRemove(table, key);
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}
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void ATermMap::remove(const string & key)
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{
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remove(string2ATerm(key));
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}
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ATermList ATermMap::keys() const
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{
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ATermList keys = ATtableKeys(table);
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if (!keys) throw Error("cannot query aterm map keys");
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return keys;
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}
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ATerm string2ATerm(const string & s)
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{
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return (ATerm) ATmakeAppl0(ATmakeAFun((char *) s.c_str(), 0, ATtrue));
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}
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string aterm2String(ATerm t)
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{
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return ATgetName(ATgetAFun(t));
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}
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ATerm bottomupRewrite(TermFun & f, ATerm e)
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{
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if (ATgetType(e) == AT_APPL) {
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AFun fun = ATgetAFun(e);
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int arity = ATgetArity(fun);
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ATermList args = ATempty;
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for (int i = arity - 1; i >= 0; i--)
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args = ATinsert(args, bottomupRewrite(f, ATgetArgument(e, i)));
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e = (ATerm) ATmakeApplList(fun, args);
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}
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else if (ATgetType(e) == AT_LIST) {
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ATermList in = (ATermList) e;
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ATermList out = ATempty;
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for (ATermIterator i(in); i; ++i)
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out = ATinsert(out, bottomupRewrite(f, *i));
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e = (ATerm) ATreverse(out);
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}
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return f(e);
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}
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void queryAllAttrs(Expr e, ATermMap & attrs)
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{
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ATMatcher m;
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ATermList bnds;
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if (!(atMatch(m, e) >> "Attrs" >> bnds))
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throw badTerm("expected attribute set", e);
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for (ATermIterator i(bnds); i; ++i) {
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string s;
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Expr e;
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if (!(atMatch(m, *i) >> "Bind" >> s >> e))
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abort(); /* can't happen */
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attrs.set(s, e);
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}
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}
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Expr queryAttr(Expr e, const string & name)
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{
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ATermMap attrs;
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queryAllAttrs(e, attrs);
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return attrs.get(name);
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}
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Expr makeAttrs(const ATermMap & attrs)
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{
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ATermList bnds = ATempty;
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for (ATermIterator i(attrs.keys()); i; ++i)
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bnds = ATinsert(bnds,
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ATmake("Bind(<term>, <term>)", *i, attrs.get(*i)));
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return ATmake("Attrs(<term>)", ATreverse(bnds));
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}
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Expr substitute(const ATermMap & subs, Expr e)
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{
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ATMatcher m;
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string s;
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if (atMatch(m, e) >> "Var" >> s) {
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Expr sub = subs.get(s);
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return sub ? sub : e;
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}
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/* In case of a function, filter out all variables bound by this
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function. */
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ATermList formals;
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ATerm body;
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if (atMatch(m, e) >> "Function" >> formals >> body) {
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ATermMap subs2(subs);
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for (ATermIterator i(formals); i; ++i) {
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Expr def;
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if (!(atMatch(m, *i) >> "NoDefFormal" >> s) &&
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!(atMatch(m, *i) >> "DefFormal" >> s >> def))
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abort();
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subs2.remove(s);
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}
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return ATmake("Function(<term>, <term>)", formals,
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substitute(subs2, body));
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}
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/* Idem for a mutually recursive attribute set. */
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ATermList bindings;
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if (atMatch(m, e) >> "Rec" >> bindings) {
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ATermMap subs2(subs);
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for (ATermIterator i(bindings); i; ++i) {
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Expr e;
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if (!(atMatch(m, *i) >> "Bind" >> s >> e))
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abort(); /* can't happen */
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subs2.remove(s);
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}
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return ATmake("Rec(<term>)", substitute(subs2, (ATerm) bindings));
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}
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if (ATgetType(e) == AT_APPL) {
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AFun fun = ATgetAFun(e);
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int arity = ATgetArity(fun);
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ATermList args = ATempty;
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for (int i = arity - 1; i >= 0; i--)
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args = ATinsert(args, substitute(subs, ATgetArgument(e, i)));
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return (ATerm) ATmakeApplList(fun, args);
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}
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if (ATgetType(e) == AT_LIST) {
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ATermList out = ATempty;
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for (ATermIterator i((ATermList) e); i; ++i)
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out = ATinsert(out, substitute(subs, *i));
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return (ATerm) ATreverse(out);
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}
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return e;
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}
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Expr makeBool(bool b)
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{
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return b ? ATmake("Bool(True)") : ATmake("Bool(False)");
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}
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@ -1,75 +0,0 @@
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#ifndef __FIXEXPR_H
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#define __FIXEXPR_H
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#include <map>
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#include <aterm2.h>
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#include "util.hh"
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/* Fix expressions are represented as ATerms. The maximal sharing
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property of the ATerm library allows us to implement caching of
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normals forms efficiently. */
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typedef ATerm Expr;
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/* Mappings from ATerms to ATerms. This is just a wrapper around
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ATerm tables. */
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class ATermMap
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{
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private:
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unsigned int maxLoadPct;
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ATermTable table;
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public:
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ATermMap(unsigned int initialSize = 16, unsigned int maxLoadPct = 75);
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ATermMap(const ATermMap & map);
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~ATermMap();
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void set(ATerm key, ATerm value);
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void set(const string & key, ATerm value);
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ATerm get(ATerm key) const;
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ATerm get(const string & key) const;
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void remove(ATerm key);
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void remove(const string & key);
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ATermList keys() const;
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};
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/* Convert a string to an ATerm (i.e., a quoted nullary function
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applicaton). */
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ATerm string2ATerm(const string & s);
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string aterm2String(ATerm t);
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/* Generic bottomup traversal over ATerms. The traversal first
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recursively descends into subterms, and then applies the given term
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function to the resulting term. */
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struct TermFun
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{
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virtual ATerm operator () (ATerm e) = 0;
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};
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ATerm bottomupRewrite(TermFun & f, ATerm e);
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/* Query all attributes in an attribute set expression. The
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expression must be in normal form. */
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void queryAllAttrs(Expr e, ATermMap & attrs);
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/* Query a specific attribute from an attribute set expression. The
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expression must be in normal form. */
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Expr queryAttr(Expr e, const string & name);
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/* Create an attribute set expression from an Attrs value. */
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Expr makeAttrs(const ATermMap & attrs);
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/* Perform a set of substitutions on an expression. */
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Expr substitute(const ATermMap & subs, Expr e);
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/* Create an expression representing a boolean. */
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Expr makeBool(bool b);
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#endif /* !__FIXEXPR_H */
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