diff options
| -rw-r--r-- | src/libexpr/fix-expr.cc | 215 | ||||
| -rw-r--r-- | src/libexpr/fix-expr.hh | 75 |
2 files changed, 0 insertions, 290 deletions
diff --git a/src/libexpr/fix-expr.cc b/src/libexpr/fix-expr.cc deleted file mode 100644 index e9c5a3ba633f..000000000000 --- a/src/libexpr/fix-expr.cc +++ /dev/null @@ -1,215 +0,0 @@ -#include "fix-expr.hh" -#include "expr.hh" - - -ATermMap::ATermMap(unsigned int initialSize, unsigned int maxLoadPct) -{ - table = ATtableCreate(initialSize, maxLoadPct); - if (!table) throw Error("cannot create ATerm table"); -} - - -ATermMap::ATermMap(const ATermMap & map) - : table(0) -{ - ATermList keys = map.keys(); - - /* !!! adjust allocation for load pct */ - table = ATtableCreate(ATgetLength(keys), map.maxLoadPct); - if (!table) throw Error("cannot create ATerm table"); - - for (ATermIterator i(keys); i; ++i) - set(*i, map.get(*i)); -} - - -ATermMap::~ATermMap() -{ - if (table) ATtableDestroy(table); -} - - -void ATermMap::set(ATerm key, ATerm value) -{ - return ATtablePut(table, key, value); -} - - -void ATermMap::set(const string & key, ATerm value) -{ - set(string2ATerm(key), value); -} - - -ATerm ATermMap::get(ATerm key) const -{ - return ATtableGet(table, key); -} - - -ATerm ATermMap::get(const string & key) const -{ - return get(string2ATerm(key)); -} - - -void ATermMap::remove(ATerm key) -{ - ATtableRemove(table, key); -} - - -void ATermMap::remove(const string & key) -{ - remove(string2ATerm(key)); -} - - -ATermList ATermMap::keys() const -{ - ATermList keys = ATtableKeys(table); - if (!keys) throw Error("cannot query aterm map keys"); - return keys; -} - - -ATerm string2ATerm(const string & s) -{ - return (ATerm) ATmakeAppl0(ATmakeAFun((char *) s.c_str(), 0, ATtrue)); -} - - -string aterm2String(ATerm t) -{ - return ATgetName(ATgetAFun(t)); -} - - -ATerm bottomupRewrite(TermFun & f, ATerm e) -{ - if (ATgetType(e) == AT_APPL) { - AFun fun = ATgetAFun(e); - int arity = ATgetArity(fun); - ATermList args = ATempty; - - for (int i = arity - 1; i >= 0; i--) - args = ATinsert(args, bottomupRewrite(f, ATgetArgument(e, i))); - - e = (ATerm) ATmakeApplList(fun, args); - } - - else if (ATgetType(e) == AT_LIST) { - ATermList in = (ATermList) e; - ATermList out = ATempty; - - for (ATermIterator i(in); i; ++i) - out = ATinsert(out, bottomupRewrite(f, *i)); - - e = (ATerm) ATreverse(out); - } - - return f(e); -} - - -void queryAllAttrs(Expr e, ATermMap & attrs) -{ - ATMatcher m; - ATermList bnds; - if (!(atMatch(m, e) >> "Attrs" >> bnds)) - throw badTerm("expected attribute set", e); - - for (ATermIterator i(bnds); i; ++i) { - string s; - Expr e; - if (!(atMatch(m, *i) >> "Bind" >> s >> e)) - abort(); /* can't happen */ - attrs.set(s, e); - } -} - - -Expr queryAttr(Expr e, const string & name) -{ - ATermMap attrs; - queryAllAttrs(e, attrs); - return attrs.get(name); -} - - -Expr makeAttrs(const ATermMap & attrs) -{ - ATermList bnds = ATempty; - for (ATermIterator i(attrs.keys()); i; ++i) - bnds = ATinsert(bnds, - ATmake("Bind(<term>, <term>)", *i, attrs.get(*i))); - return ATmake("Attrs(<term>)", ATreverse(bnds)); -} - - -Expr substitute(const ATermMap & subs, Expr e) -{ - ATMatcher m; - string s; - - if (atMatch(m, e) >> "Var" >> s) { - Expr sub = subs.get(s); - return sub ? sub : e; - } - - /* In case of a function, filter out all variables bound by this - function. */ - ATermList formals; - ATerm body; - if (atMatch(m, e) >> "Function" >> formals >> body) { - ATermMap subs2(subs); - for (ATermIterator i(formals); i; ++i) { - Expr def; - if (!(atMatch(m, *i) >> "NoDefFormal" >> s) && - !(atMatch(m, *i) >> "DefFormal" >> s >> def)) - abort(); - subs2.remove(s); - } - return ATmake("Function(<term>, <term>)", formals, - substitute(subs2, body)); - } - - /* Idem for a mutually recursive attribute set. */ - ATermList bindings; - if (atMatch(m, e) >> "Rec" >> bindings) { - ATermMap subs2(subs); - for (ATermIterator i(bindings); i; ++i) { - Expr e; - if (!(atMatch(m, *i) >> "Bind" >> s >> e)) - abort(); /* can't happen */ - subs2.remove(s); - } - return ATmake("Rec(<term>)", substitute(subs2, (ATerm) bindings)); - } - - if (ATgetType(e) == AT_APPL) { - AFun fun = ATgetAFun(e); - int arity = ATgetArity(fun); - ATermList args = ATempty; - - for (int i = arity - 1; i >= 0; i--) - args = ATinsert(args, substitute(subs, ATgetArgument(e, i))); - - return (ATerm) ATmakeApplList(fun, args); - } - - if (ATgetType(e) == AT_LIST) { - ATermList out = ATempty; - for (ATermIterator i((ATermList) e); i; ++i) - out = ATinsert(out, substitute(subs, *i)); - return (ATerm) ATreverse(out); - } - - return e; -} - - -Expr makeBool(bool b) -{ - return b ? ATmake("Bool(True)") : ATmake("Bool(False)"); -} diff --git a/src/libexpr/fix-expr.hh b/src/libexpr/fix-expr.hh deleted file mode 100644 index 6c1e51d9ccd6..000000000000 --- a/src/libexpr/fix-expr.hh +++ /dev/null @@ -1,75 +0,0 @@ -#ifndef __FIXEXPR_H -#define __FIXEXPR_H - -#include <map> - -#include <aterm2.h> - -#include "util.hh" - - -/* Fix expressions are represented as ATerms. The maximal sharing - property of the ATerm library allows us to implement caching of - normals forms efficiently. */ -typedef ATerm Expr; - - -/* Mappings from ATerms to ATerms. This is just a wrapper around - ATerm tables. */ -class ATermMap -{ -private: - unsigned int maxLoadPct; - ATermTable table; - -public: - ATermMap(unsigned int initialSize = 16, unsigned int maxLoadPct = 75); - ATermMap(const ATermMap & map); - ~ATermMap(); - - void set(ATerm key, ATerm value); - void set(const string & key, ATerm value); - - ATerm get(ATerm key) const; - ATerm get(const string & key) const; - - void remove(ATerm key); - void remove(const string & key); - - ATermList keys() const; -}; - - -/* Convert a string to an ATerm (i.e., a quoted nullary function - applicaton). */ -ATerm string2ATerm(const string & s); -string aterm2String(ATerm t); - -/* Generic bottomup traversal over ATerms. The traversal first - recursively descends into subterms, and then applies the given term - function to the resulting term. */ -struct TermFun -{ - virtual ATerm operator () (ATerm e) = 0; -}; -ATerm bottomupRewrite(TermFun & f, ATerm e); - -/* Query all attributes in an attribute set expression. The - expression must be in normal form. */ -void queryAllAttrs(Expr e, ATermMap & attrs); - -/* Query a specific attribute from an attribute set expression. The - expression must be in normal form. */ -Expr queryAttr(Expr e, const string & name); - -/* Create an attribute set expression from an Attrs value. */ -Expr makeAttrs(const ATermMap & attrs); - -/* Perform a set of substitutions on an expression. */ -Expr substitute(const ATermMap & subs, Expr e); - -/* Create an expression representing a boolean. */ -Expr makeBool(bool b); - - -#endif /* !__FIXEXPR_H */ |