forked from lix-project/lix
* Refactoring: combine functions that take an attribute set and
functions that take a single argument (plain lambdas) into one AST node (Function) that contains a Pattern node describing the arguments. Current patterns are single lazy arguments (VarPat) and matching against an attribute set (AttrsPat). This refactoring allows other kinds of patterns to be added easily, such as Haskell-style @-patterns, or list pattern matching.
This commit is contained in:
Eelco Dolstra
parent
c03b729319
commit
efe4b690ae
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@ -74,14 +74,23 @@ LocalNoInline(void addErrorPrefix(Error & e, const char * s, const string & s2,
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}
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/* Substitute an argument set into the body of a function. */
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static Expr substArgs(EvalState & state,
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Expr body, ATermList formals, Expr arg)
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static void patternMatch(EvalState & state,
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Pattern pat, Expr arg, ATermMap & subs)
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{
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unsigned int nrFormals = ATgetLength(formals);
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ATermMap subs(nrFormals);
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ATerm name;
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ATermList formals;
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/* Get the actual arguments and put them in the substitution. */
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if (matchVarPat(pat, name))
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subs.set(name, arg);
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else if (matchAttrsPat(pat, formals)) {
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arg = evalExpr(state, arg);
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unsigned int nrFormals = ATgetLength(formals);
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/* Get the actual arguments and put them in the substitution.
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!!! shouldn't do this once we add `...'.*/
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ATermMap args;
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queryAllAttrs(arg, args);
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for (ATermMap::const_iterator i = args.begin(); i != args.end(); ++i)
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@ -105,12 +114,13 @@ static Expr substArgs(EvalState & state,
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defsUsed.push_back(name);
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recAttrs = ATinsert(recAttrs, makeBind(name, def, makeNoPos()));
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}
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}
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/* Make a recursive attribute set out of the (argument-name,
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value) tuples. This is so that we can support default
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parameters that refer to each other, e.g. ({x, y ? x + x}: y)
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{x = "foo";} evaluates to "foofoo". */
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parameters that refer to each other, e.g. ({x, y ? x + x}:
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y) {x = "foo";} evaluates to "foofoo". */
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if (defsUsed.size() != 0) {
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for (ATermMap::const_iterator i = args.begin(); i != args.end(); ++i)
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recAttrs = ATinsert(recAttrs, makeBind(i->key, i->value, makeNoPos()));
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@ -120,8 +130,8 @@ static Expr substArgs(EvalState & state,
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}
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if (subs.size() != nrFormals) {
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/* One or more actual arguments were not declared as formal
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arguments. Find out which. */
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/* One or more actual arguments were not declared as
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formal arguments. Find out which. */
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for (ATermIterator i(formals); i; ++i) {
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Expr name; ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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@ -131,6 +141,20 @@ static Expr substArgs(EvalState & state,
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% aterm2String(subs.begin()->key));
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}
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}
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else abort();
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}
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/* Substitute an argument set into the body of a function. */
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static Expr substArgs(EvalState & state,
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Expr body, Pattern pat, Expr arg)
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{
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ATermMap subs(16);
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patternMatch(state, pat, arg, subs);
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return substitute(Substitution(0, &subs), body);
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}
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@ -370,10 +394,12 @@ Path coerceToPath(EvalState & state, Expr e, PathSet & context)
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Expr autoCallFunction(Expr e, const ATermMap & args)
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{
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ATermList formals;
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Pattern pat;
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ATerm body, pos;
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ATermList formals;
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if (matchFunction(e, formals, body, pos)) {
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/* !!! this should be more general */
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if (matchFunction(e, pat, body, pos) && matchAttrsPat(pat, formals)) {
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ATermMap actualArgs(ATgetLength(formals));
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for (ATermIterator i(formals); i; ++i) {
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@ -418,8 +444,8 @@ LocalNoInline(Expr evalVar(EvalState & state, ATerm name))
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LocalNoInline(Expr evalCall(EvalState & state, Expr fun, Expr arg))
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{
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ATermList formals;
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ATerm pos, name;
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Pattern pat;
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ATerm pos;
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Expr body;
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/* Evaluate the left-hand side. */
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@ -445,22 +471,9 @@ LocalNoInline(Expr evalCall(EvalState & state, Expr fun, Expr arg))
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return makePrimOp(arity, funBlob, args);
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}
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else if (matchFunction(fun, formals, body, pos)) {
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arg = evalExpr(state, arg);
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else if (matchFunction(fun, pat, body, pos)) {
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try {
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return evalExpr(state, substArgs(state, body, formals, arg));
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the function at %1%:\n",
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showPos(pos));
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throw;
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}
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}
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else if (matchFunction1(fun, name, body, pos)) {
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try {
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ATermMap subs(1);
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subs.set(name, arg);
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return evalExpr(state, substitute(Substitution(0, &subs), body));
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return evalExpr(state, substArgs(state, body, pat, arg));
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} catch (Error & e) {
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addErrorPrefix(e, "while evaluating the function at %1%:\n",
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showPos(pos));
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@ -624,7 +637,6 @@ Expr evalExpr2(EvalState & state, Expr e)
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sym == symInt ||
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sym == symBool ||
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sym == symFunction ||
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sym == symFunction1 ||
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sym == symAttrs ||
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sym == symList ||
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sym == symPrimOp)
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@ -40,6 +40,23 @@ static void showAttrs(const ATermMap & attrs, XMLWriter & doc,
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}
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static void printPatternAsXML(Pattern pat, XMLWriter & doc, PathSet & context)
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{
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ATerm name;
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ATermList formals;
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if (matchVarPat(pat, name))
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doc.writeEmptyElement("varpat", singletonAttrs("name", aterm2String(name)));
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else if (matchAttrsPat(pat, formals)) {
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XMLOpenElement _(doc, "attrspat");
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for (ATermIterator i(formals); i; ++i) {
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Expr name; ATerm dummy;
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if (!matchFormal(*i, name, dummy)) abort();
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doc.writeEmptyElement("attr", singletonAttrs("name", aterm2String(name)));
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}
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}
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}
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static void printTermAsXML(Expr e, XMLWriter & doc, PathSet & context,
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ExprSet & drvsSeen)
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{
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@ -47,8 +64,8 @@ static void printTermAsXML(Expr e, XMLWriter & doc, PathSet & context,
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string s;
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ATerm s2;
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int i;
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ATermList as, es, formals;
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ATerm body, pos;
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ATermList as, es;
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ATerm pat, body, pos;
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checkInterrupt();
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@ -109,14 +126,9 @@ static void printTermAsXML(Expr e, XMLWriter & doc, PathSet & context,
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printTermAsXML(*i, doc, context, drvsSeen);
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}
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else if (matchFunction(e, formals, body, pos)) {
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else if (matchFunction(e, pat, body, pos)) {
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XMLOpenElement _(doc, "function");
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for (ATermIterator i(formals); i; ++i) {
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Expr name; ATerm dummy;
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if (!matchFormal(*i, name, dummy)) abort();
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XMLOpenElement _(doc, "arg", singletonAttrs("name", aterm2String(name)));
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}
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printPatternAsXML(pat, doc, context);
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}
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else
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@ -3,8 +3,7 @@ init initNixExprHelpers
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Pos | string int int | Pos |
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NoPos | | Pos |
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Function | ATermList Expr Pos | Expr |
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Function1 | string Expr Pos | Expr |
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Function | Pattern Expr Pos | Expr |
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Assert | Expr Expr Pos | Expr |
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With | Expr Expr Pos | Expr |
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If | Expr Expr Expr | Expr |
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@ -76,6 +75,9 @@ Inherit | Expr ATermList Pos | ATerm |
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Scope | | Expr |
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VarPat | string | Pattern |
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AttrsPat | ATermList | Pattern |
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Formal | string DefaultValue | ATerm |
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DefaultValue | Expr | DefaultValue |
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@ -110,6 +110,25 @@ Expr makeAttrs(const ATermMap & attrs)
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}
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static void varsBoundByPattern(ATermMap & map, Pattern pat)
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{
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ATerm name;
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ATermList formals;
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/* Use makeRemoved() so that it can be used directly in
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substitute(). */
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if (matchVarPat(pat, name))
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map.set(name, makeRemoved());
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else if (matchAttrsPat(pat, formals)) {
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for (ATermIterator i(formals); i; ++i) {
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ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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map.set(name, makeRemoved());
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}
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}
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else abort();
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}
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Expr substitute(const Substitution & subs, Expr e)
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{
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checkInterrupt();
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@ -135,27 +154,17 @@ Expr substitute(const Substitution & subs, Expr e)
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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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Pattern pat;
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ATerm body;
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if (matchFunction(e, formals, body, pos)) {
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ATermMap map(ATgetLength(formals));
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for (ATermIterator i(formals); i; ++i) {
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ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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map.set(name, makeRemoved());
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}
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if (matchFunction(e, pat, body, pos)) {
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ATermMap map(16);
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varsBoundByPattern(map, pat);
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Substitution subs2(&subs, &map);
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return makeFunction(
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(ATermList) substitute(subs2, (ATerm) formals),
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(Pattern) substitute(subs2, (Expr) pat),
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substitute(subs2, body), pos);
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}
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if (matchFunction1(e, name, body, pos)) {
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ATermMap map(1);
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map.set(name, makeRemoved());
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return makeFunction1(name, substitute(Substitution(&subs, &map), body), pos);
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}
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/* Idem for a mutually recursive attribute set. */
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ATermList rbnds, nrbnds;
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if (matchRec(e, rbnds, nrbnds)) {
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@ -213,9 +222,9 @@ static void checkVarDefs2(set<Expr> & done, const ATermMap & defs, Expr e)
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done.insert(e);
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ATerm name, pos, value;
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ATermList formals;
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ATerm with, body;
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ATermList rbnds, nrbnds;
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Pattern pat;
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/* Closed terms don't have free variables, so we don't have to
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check by definition. */
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@ -227,27 +236,11 @@ static void checkVarDefs2(set<Expr> & done, const ATermMap & defs, Expr e)
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% aterm2String(name));
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}
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else if (matchFunction(e, formals, body, pos)) {
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else if (matchFunction(e, pat, body, pos)) {
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ATermMap defs2(defs);
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for (ATermIterator i(formals); i; ++i) {
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ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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defs2.set(name, (ATerm) ATempty);
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}
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for (ATermIterator i(formals); i; ++i) {
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ATerm deflt;
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set<Expr> done2;
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if (!matchFormal(*i, name, deflt)) abort();
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checkVarDefs2(done2, defs2, deflt);
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}
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set<Expr> done2;
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checkVarDefs2(done2, defs2, body);
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}
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else if (matchFunction1(e, name, body, pos)) {
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ATermMap defs2(defs);
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defs2.set(name, (ATerm) ATempty);
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varsBoundByPattern(defs2, pat);
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set<Expr> done2;
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checkVarDefs2(done2, defs2, pat);
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checkVarDefs2(done2, defs2, body);
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}
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@ -365,13 +358,13 @@ string showType(Expr e)
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ATermList l1;
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ATermBlob b1;
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int i1;
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Pattern p1;
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if (matchStr(e, t1, l1)) return "a string";
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if (matchPath(e, t1)) return "a path";
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if (matchNull(e)) return "null";
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if (matchInt(e, i1)) return "an integer";
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if (matchBool(e, t1)) return "a boolean";
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if (matchFunction(e, l1, t1, t2)) return "a function";
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if (matchFunction1(e, t1, t2, t3)) return "a function";
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if (matchFunction(e, p1, t1, t2)) return "a function";
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if (matchAttrs(e, l1)) return "an attribute set";
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if (matchList(e, l1)) return "a list";
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if (matchPrimOp(e, i1, b1, l1)) return "a partially applied built-in function";
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@ -21,11 +21,9 @@ MakeError(TypeError, EvalError)
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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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typedef ATerm DefaultValue;
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typedef ATerm ValidValues;
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typedef ATerm Pos;
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typedef ATerm Pattern;
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/* A STL vector of ATerms. Should be used with great care since it's
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@ -237,9 +237,9 @@ expr: expr_function;
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expr_function
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: '{' formals '}' ':' expr_function
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{ $$ = makeFunction($2, $5, CUR_POS); }
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{ $$ = makeFunction(makeAttrsPat($2), $5, CUR_POS); }
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| ID ':' expr_function
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{ $$ = makeFunction1($1, $3, CUR_POS); }
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{ $$ = makeFunction(makeVarPat($1), $3, CUR_POS); }
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| ASSERT expr ';' expr_function
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{ $$ = makeAssert($2, $4, CUR_POS); }
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| WITH expr ';' expr_function
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@ -387,21 +387,36 @@ static void checkAttrs(ATermMap & names, ATermList bnds)
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}
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static void checkAttrSets(ATerm e)
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static void checkPatternVars(ATerm pos, ATermMap & map, Pattern pat)
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{
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ATermList formals;
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ATerm body, pos;
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if (matchFunction(e, formals, body, pos)) {
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ATermMap names(ATgetLength(formals));
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for (ATermIterator i(formals); i; ++i) {
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ATerm name;
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ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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if (names.get(name))
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ATermList formals;
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if (matchVarPat(pat, name)) {
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if (map.get(name))
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throw EvalError(format("duplicate formal function argument `%1%' at %2%")
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% aterm2String(name) % showPos(pos));
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names.set(name, name);
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map.set(name, name);
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}
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else if (matchAttrsPat(pat, formals)) {
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for (ATermIterator i(formals); i; ++i) {
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ATerm d1;
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if (!matchFormal(*i, name, d1)) abort();
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if (map.get(name))
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throw EvalError(format("duplicate formal function argument `%1%' at %2%")
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% aterm2String(name) % showPos(pos));
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map.set(name, name);
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}
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}
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else abort();
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}
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static void checkAttrSets(ATerm e)
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{
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ATerm pat, body, pos;
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if (matchFunction(e, pat, body, pos)) {
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ATermMap map(16);
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checkPatternVars(pos, map, pat);
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}
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ATermList bnds;
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@ -120,11 +120,9 @@ static Expr prim_isNull(EvalState & state, const ATermVector & args)
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static Expr prim_isFunction(EvalState & state, const ATermVector & args)
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{
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Expr e = evalExpr(state, args[0]);
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ATermList formals;
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ATerm name, body, pos;
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return makeBool(
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matchFunction(e, formals, body, pos) ||
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matchFunction1(e, name, body, pos));
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Pattern pat;
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ATerm body, pos;
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return makeBool(matchFunction(e, pat, body, pos));
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}
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@ -12,12 +12,16 @@
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</attr>
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<attr name="f">
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<function>
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<arg name="z">
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</arg>
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<arg name="x">
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</arg>
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<arg name="y">
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</arg>
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<attrspat>
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<attr name="z" />
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<attr name="x" />
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<attr name="y" />
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</attrspat>
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</function>
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</attr>
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<attr name="id">
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<function>
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<varpat name="x" />
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</function>
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</attr>
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<attr name="x">
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@ -10,4 +10,6 @@ rec {
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f = {z, x, y}: if y then x else z;
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id = x: x;
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}
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@ -1 +1 @@
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Function([Formal("x",NoDefaultValue),Formal("y",NoDefaultValue),Formal("z",NoDefaultValue)],OpPlus(OpPlus(Var("x"),Var("y")),Var("z")),NoPos)
|
||||
Function(AttrsPat([Formal("x",NoDefaultValue),Formal("y",NoDefaultValue),Formal("z",NoDefaultValue)]),OpPlus(OpPlus(Var("x"),Var("y")),Var("z")),NoPos)
|
||||
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@ -1 +1 @@
|
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Function([Formal("stdenv",NoDefaultValue),Formal("fetchurl",NoDefaultValue)],Call(Select(Var("stdenv"),"mkDerivation"),Attrs([Bind("name",Str("libXi-6.0.1",[]),NoPos),Bind("src",Call(Var("fetchurl"),Attrs([Bind("md5",Str("7e935a42428d63a387b3c048be0f2756",[]),NoPos),Bind("url",Str("http://freedesktop.org/~xlibs/release/libXi-6.0.1.tar.bz2",[]),NoPos)])),NoPos)])),NoPos)
|
||||
Function(AttrsPat([Formal("stdenv",NoDefaultValue),Formal("fetchurl",NoDefaultValue)]),Call(Select(Var("stdenv"),"mkDerivation"),Attrs([Bind("name",Str("libXi-6.0.1",[]),NoPos),Bind("src",Call(Var("fetchurl"),Attrs([Bind("md5",Str("7e935a42428d63a387b3c048be0f2756",[]),NoPos),Bind("url",Str("http://freedesktop.org/~xlibs/release/libXi-6.0.1.tar.bz2",[]),NoPos)])),NoPos)])),NoPos)
|
||||
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|
|||
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@ -1 +1 @@
|
|||
Function([Formal("localServer",DefaultValue(Var("false"))),Formal("httpServer",DefaultValue(Var("false"))),Formal("sslSupport",DefaultValue(Var("false"))),Formal("pythonBindings",DefaultValue(Var("false"))),Formal("javaSwigBindings",DefaultValue(Var("false"))),Formal("javahlBindings",DefaultValue(Var("false"))),Formal("stdenv",NoDefaultValue),Formal("fetchurl",NoDefaultValue),Formal("openssl",DefaultValue(Var("null"))),Formal("httpd",DefaultValue(Var("null"))),Formal("db4",DefaultValue(Var("null"))),Formal("expat",NoDefaultValue),Formal("swig",DefaultValue(Var("null"))),Formal("j2sdk",DefaultValue(Var("null")))],Assert(OpNEq(Var("expat"),Var("null")),Assert(OpImpl(Var("localServer"),OpNEq(Var("db4"),Var("null"))),Assert(OpImpl(Var("httpServer"),OpAnd(OpNEq(Var("httpd"),Var("null")),OpEq(Select(Var("httpd"),"expat"),Var("expat")))),Assert(OpImpl(Var("sslSupport"),OpAnd(OpNEq(Var("openssl"),Var("null")),OpImpl(Var("httpServer"),OpEq(Select(Var("httpd"),"openssl"),Var("openssl"))))),Assert(OpImpl(Var("pythonBindings"),OpAnd(OpNEq(Var("swig"),Var("null")),Select(Var("swig"),"pythonSupport"))),Assert(OpImpl(Var("javaSwigBindings"),OpAnd(OpNEq(Var("swig"),Var("null")),Select(Var("swig"),"javaSupport"))),Assert(OpImpl(Var("javahlBindings"),OpNEq(Var("j2sdk"),Var("null"))),Call(Select(Var("stdenv"),"mkDerivation"),Attrs([Bind("builder",Path("/foo/bar"),NoPos),Bind("db4",If(Var("localServer"),Var("db4"),Var("null")),NoPos),Bind("expat",Var("expat"),NoPos),Bind("httpServer",Var("httpServer"),NoPos),Bind("httpd",If(Var("httpServer"),Var("httpd"),Var("null")),NoPos),Bind("j2sdk",If(Var("javaSwigBindings"),Select(Var("swig"),"j2sdk"),If(Var("javahlBindings"),Var("j2sdk"),Var("null"))),NoPos),Bind("javaSwigBindings",Var("javaSwigBindings"),NoPos),Bind("javahlBindings",Var("javahlBindings"),NoPos),Bind("localServer",Var("localServer"),NoPos),Bind("name",Str("subversion-1.1.1",[]),NoPos),Bind("openssl",If(Var("sslSupport"),Var("openssl"),Var("null")),NoPos),Bind("patches",If(Var("javahlBindings"),List([Path("/javahl.patch")]),List([])),NoPos),Bind("python",If(Var("pythonBindings"),Select(Var("swig"),"python"),Var("null")),NoPos),Bind("pythonBindings",Var("pythonBindings"),NoPos),Bind("src",Call(Var("fetchurl"),Attrs([Bind("md5",Str("a180c3fe91680389c210c99def54d9e0",[]),NoPos),Bind("url",Str("http://subversion.tigris.org/tarballs/subversion-1.1.1.tar.bz2",[]),NoPos)])),NoPos),Bind("sslSupport",Var("sslSupport"),NoPos),Bind("swig",If(OpOr(Var("pythonBindings"),Var("javaSwigBindings")),Var("swig"),Var("null")),NoPos)])),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos)
|
||||
Function(AttrsPat([Formal("localServer",DefaultValue(Var("false"))),Formal("httpServer",DefaultValue(Var("false"))),Formal("sslSupport",DefaultValue(Var("false"))),Formal("pythonBindings",DefaultValue(Var("false"))),Formal("javaSwigBindings",DefaultValue(Var("false"))),Formal("javahlBindings",DefaultValue(Var("false"))),Formal("stdenv",NoDefaultValue),Formal("fetchurl",NoDefaultValue),Formal("openssl",DefaultValue(Var("null"))),Formal("httpd",DefaultValue(Var("null"))),Formal("db4",DefaultValue(Var("null"))),Formal("expat",NoDefaultValue),Formal("swig",DefaultValue(Var("null"))),Formal("j2sdk",DefaultValue(Var("null")))]),Assert(OpNEq(Var("expat"),Var("null")),Assert(OpImpl(Var("localServer"),OpNEq(Var("db4"),Var("null"))),Assert(OpImpl(Var("httpServer"),OpAnd(OpNEq(Var("httpd"),Var("null")),OpEq(Select(Var("httpd"),"expat"),Var("expat")))),Assert(OpImpl(Var("sslSupport"),OpAnd(OpNEq(Var("openssl"),Var("null")),OpImpl(Var("httpServer"),OpEq(Select(Var("httpd"),"openssl"),Var("openssl"))))),Assert(OpImpl(Var("pythonBindings"),OpAnd(OpNEq(Var("swig"),Var("null")),Select(Var("swig"),"pythonSupport"))),Assert(OpImpl(Var("javaSwigBindings"),OpAnd(OpNEq(Var("swig"),Var("null")),Select(Var("swig"),"javaSupport"))),Assert(OpImpl(Var("javahlBindings"),OpNEq(Var("j2sdk"),Var("null"))),Call(Select(Var("stdenv"),"mkDerivation"),Attrs([Bind("builder",Path("/foo/bar"),NoPos),Bind("db4",If(Var("localServer"),Var("db4"),Var("null")),NoPos),Bind("expat",Var("expat"),NoPos),Bind("httpServer",Var("httpServer"),NoPos),Bind("httpd",If(Var("httpServer"),Var("httpd"),Var("null")),NoPos),Bind("j2sdk",If(Var("javaSwigBindings"),Select(Var("swig"),"j2sdk"),If(Var("javahlBindings"),Var("j2sdk"),Var("null"))),NoPos),Bind("javaSwigBindings",Var("javaSwigBindings"),NoPos),Bind("javahlBindings",Var("javahlBindings"),NoPos),Bind("localServer",Var("localServer"),NoPos),Bind("name",Str("subversion-1.1.1",[]),NoPos),Bind("openssl",If(Var("sslSupport"),Var("openssl"),Var("null")),NoPos),Bind("patches",If(Var("javahlBindings"),List([Path("/javahl.patch")]),List([])),NoPos),Bind("python",If(Var("pythonBindings"),Select(Var("swig"),"python"),Var("null")),NoPos),Bind("pythonBindings",Var("pythonBindings"),NoPos),Bind("src",Call(Var("fetchurl"),Attrs([Bind("md5",Str("a180c3fe91680389c210c99def54d9e0",[]),NoPos),Bind("url",Str("http://subversion.tigris.org/tarballs/subversion-1.1.1.tar.bz2",[]),NoPos)])),NoPos),Bind("sslSupport",Var("sslSupport"),NoPos),Bind("swig",If(OpOr(Var("pythonBindings"),Var("javaSwigBindings")),Var("swig"),Var("null")),NoPos)])),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos),NoPos)
|
||||
|
|
|
|||
Loading…
Reference in a new issue