forked from lix-project/lix
487 lines
13 KiB
C++
487 lines
13 KiB
C++
#include <map>
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#include <iostream>
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#include "globals.hh"
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#include "normalise.hh"
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#include "shared.hh"
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typedef ATerm Expr;
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typedef map<ATerm, ATerm> NormalForms;
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typedef map<FSId, Strings> PkgPaths;
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typedef map<FSId, Hash> PkgHashes;
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struct EvalState
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{
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Strings searchDirs;
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NormalForms normalForms;
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PkgPaths pkgPaths;
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PkgHashes pkgHashes; /* normalised package hashes */
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Expr blackHole;
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EvalState()
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{
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blackHole = ATmake("BlackHole()");
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if (!blackHole) throw Error("cannot build black hole");
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}
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};
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static Expr evalFile(EvalState & state, string fileName);
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static Expr evalExpr(EvalState & state, Expr e);
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static string searchPath(const Strings & searchDirs, string relPath)
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{
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if (string(relPath, 0, 1) == "/") return relPath;
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for (Strings::const_iterator i = searchDirs.begin();
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i != searchDirs.end(); i++)
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{
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string path = *i + "/" + relPath;
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if (pathExists(path)) return path;
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}
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throw Error(
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format("path `%1%' not found in any of the search directories")
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% relPath);
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}
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static Expr substExpr(string x, Expr rep, Expr e)
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{
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char * s;
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Expr e2;
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if (ATmatch(e, "Var(<str>)", &s))
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if (x == s)
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return rep;
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else
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return e;
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ATermList formals;
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if (ATmatch(e, "Function([<list>], <term>)", &formals, &e2)) {
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while (!ATisEmpty(formals)) {
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if (!ATmatch(ATgetFirst(formals), "<str>", &s))
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throw badTerm("not a list of formals", (ATerm) formals);
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if (x == (string) s)
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return e;
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formals = ATgetNext(formals);
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}
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}
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/* Generically substitute in subterms. */
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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, substExpr(x, rep, 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 in = (ATermList) e;
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ATermList out = ATempty;
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while (!ATisEmpty(in)) {
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out = ATinsert(out, substExpr(x, rep, ATgetFirst(in)));
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in = ATgetNext(in);
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}
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return (ATerm) ATreverse(out);
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}
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throw badTerm("do not know how to substitute", e);
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}
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static Expr substExprMany(ATermList formals, ATermList args, Expr body)
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{
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char * s;
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Expr e;
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/* !!! check args against formals */
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while (!ATisEmpty(args)) {
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ATerm tup = ATgetFirst(args);
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if (!ATmatch(tup, "(<str>, <term>)", &s, &e))
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throw badTerm("expected an argument tuple", tup);
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body = substExpr(s, e, body);
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args = ATgetNext(args);
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}
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return body;
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}
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static Strings fstatePathsCached(EvalState & state, const FSId & id)
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{
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PkgPaths::iterator i = state.pkgPaths.find(id);
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if (i != state.pkgPaths.end())
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return i->second;
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else {
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Strings paths = fstatePaths(id);
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state.pkgPaths[id] = paths;
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return paths;
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}
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}
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static Hash hashPackage(EvalState & state, FState fs)
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{
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if (fs.type == FState::fsDerive) {
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FSIdSet inputs2;
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for (FSIdSet::iterator i = fs.derive.inputs.begin();
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i != fs.derive.inputs.end(); i++)
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{
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PkgHashes::iterator j = state.pkgHashes.find(*i);
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if (j == state.pkgHashes.end())
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throw Error(format("unknown package id %1%") % (string) *i);
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inputs2.insert(j->second);
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}
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fs.derive.inputs = inputs2;
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}
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return hashTerm(unparseFState(fs));
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}
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static string processBinding(EvalState & state, Expr e, FState & fs)
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{
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char * s1;
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if (ATmatch(e, "FSId(<str>)", &s1)) {
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FSId id = parseHash(s1);
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Strings paths = fstatePathsCached(state, id);
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if (paths.size() != 1) abort();
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string path = *(paths.begin());
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fs.derive.inputs.insert(id);
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return path;
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}
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if (ATmatch(e, "<str>", &s1))
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return s1;
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if (ATmatch(e, "True")) return "1";
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if (ATmatch(e, "False")) return "";
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ATermList l;
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if (ATmatch(e, "[<list>]", &l)) {
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string s;
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bool first = true;
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while (!ATisEmpty(l)) {
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if (!first) s = s + " "; else first = false;
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s += processBinding(state, evalExpr(state, ATgetFirst(l)), fs);
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l = ATgetNext(l);
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}
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return s;
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}
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throw badTerm("invalid package binding", e);
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}
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static Expr evalExpr2(EvalState & state, Expr e)
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{
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char * s1;
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Expr e1, e2, e3, e4;
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ATermList bnds;
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/* Normal forms. */
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if (ATmatch(e, "<str>", &s1) ||
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ATmatch(e, "[<list>]", &e1) ||
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ATmatch(e, "True") ||
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ATmatch(e, "False") ||
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ATmatch(e, "Function([<list>], <term>)", &e1, &e2) ||
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ATmatch(e, "FSId(<str>)", &s1))
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return e;
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try {
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Hash pkgHash = hashPackage(state, parseFState(e));
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FSId pkgId = writeTerm(e, "");
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state.pkgHashes[pkgId] = pkgHash;
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return ATmake("FSId(<str>)", ((string) pkgId).c_str());
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} catch (...) { /* !!! catch parse errors only */
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}
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/* Application. */
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if (ATmatch(e, "Call(<term>, [<list>])", &e1, &e2) ||
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ATmatch(e, "App(<term>, [<list>])", &e1, &e2)) {
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e1 = evalExpr(state, e1);
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if (!ATmatch(e1, "Function([<list>], <term>)", &e3, &e4))
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throw badTerm("expecting a function", e1);
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return evalExpr(state,
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substExprMany((ATermList) e3, (ATermList) e2, e4));
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}
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/* Conditional. */
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if (ATmatch(e, "If(<term>, <term>, <term>)", &e1, &e2, &e3)) {
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e1 = evalExpr(state, e1);
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Expr x;
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if (ATmatch(e1, "True")) x = e2;
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else if (ATmatch(e1, "False")) x = e3;
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else throw badTerm("expecting a boolean", e1);
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return evalExpr(state, x);
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}
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/* Ad-hoc function for string matching. */
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if (ATmatch(e, "HasSubstr(<term>, <term>)", &e1, &e2)) {
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e1 = evalExpr(state, e1);
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e2 = evalExpr(state, e2);
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char * s1, * s2;
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if (!ATmatch(e1, "<str>", &s1))
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throw badTerm("expecting a string", e1);
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if (!ATmatch(e2, "<str>", &s2))
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throw badTerm("expecting a string", e2);
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return
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string(s1).find(string(s2)) != string::npos ?
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ATmake("True") : ATmake("False");
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}
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/* Platform constant. */
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if (ATmatch(e, "Platform")) {
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return ATmake("<str>", SYSTEM);
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}
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/* Fix inclusion. */
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if (ATmatch(e, "IncludeFix(<str>)", &s1)) {
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string fileName(s1);
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return evalFile(state, s1);
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}
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/* Relative files. */
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if (ATmatch(e, "Relative(<str>)", &s1)) {
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string srcPath = searchPath(state.searchDirs, s1);
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string dstPath;
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FSId id;
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addToStore(srcPath, dstPath, id, true);
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SliceElem elem;
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elem.id = id;
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FState fs;
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fs.type = FState::fsSlice;
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fs.slice.roots.insert(dstPath);
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fs.slice.elems[dstPath] = elem;
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Hash pkgHash = hashPackage(state, fs);
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FSId pkgId = writeTerm(unparseFState(fs), "");
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state.pkgHashes[pkgId] = pkgHash;
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msg(lvlChatty, format("copied `%1%' -> %2%")
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% srcPath % (string) pkgId);
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return ATmake("FSId(<str>)", ((string) pkgId).c_str());
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}
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/* Packages are transformed into Derive fstate expressions. */
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if (ATmatch(e, "Package([<list>])", &bnds)) {
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/* Evaluate the bindings and put them in a map. */
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map<string, ATerm> bndMap;
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bndMap["platform"] = ATmake("<str>", SYSTEM);
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while (!ATisEmpty(bnds)) {
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ATerm bnd = ATgetFirst(bnds);
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if (!ATmatch(bnd, "(<str>, <term>)", &s1, &e1))
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throw badTerm("binding expected", bnd);
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bndMap[s1] = evalExpr(state, e1);
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bnds = ATgetNext(bnds);
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}
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/* Gather information for building the Derive expression. */
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FState fs;
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fs.type = FState::fsDerive;
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fs.derive.platform = SYSTEM;
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string name;
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FSId outId;
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bool outIdGiven = false;
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bnds = ATempty;
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for (map<string, ATerm>::iterator it = bndMap.begin();
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it != bndMap.end(); it++)
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{
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string key = it->first;
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ATerm value = it->second;
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if (key == "args") {
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ATermList args;
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if (!ATmatch(value, "[<list>]", &args))
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throw badTerm("list expected", value);
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while (!ATisEmpty(args)) {
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Expr arg = evalExpr(state, ATgetFirst(args));
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fs.derive.args.push_back(processBinding(state, arg, fs));
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args = ATgetNext(args);
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}
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}
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else {
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string s = processBinding(state, value, fs);
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fs.derive.env[key] = s;
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if (key == "build") fs.derive.builder = s;
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if (key == "name") name = s;
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if (key == "id") {
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outId = parseHash(s);
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outIdGiven = true;
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}
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}
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bnds = ATinsert(bnds,
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ATmake("(<str>, <term>)", key.c_str(), value));
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}
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if (fs.derive.builder == "")
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throw badTerm("no builder specified", e);
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if (name == "")
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throw badTerm("no package name specified", e);
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/* Hash the fstate-expression with no outputs to produce a
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unique but deterministic path name for this package. */
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if (!outIdGiven) outId = hashPackage(state, fs);
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string outPath =
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canonPath(nixStore + "/" + ((string) outId).c_str() + "-" + name);
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fs.derive.env["out"] = outPath;
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fs.derive.outputs[outPath] = outId;
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/* Write the resulting term into the Nix store directory. */
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Hash pkgHash = outIdGiven
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? hashString((string) outId + outPath)
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: hashPackage(state, fs);
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FSId pkgId = writeTerm(unparseFState(fs), "-d-" + name);
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state.pkgHashes[pkgId] = pkgHash;
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msg(lvlChatty, format("instantiated `%1%' -> %2%")
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% name % (string) pkgId);
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return ATmake("FSId(<str>)", ((string) pkgId).c_str());
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}
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/* BaseName primitive function. */
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if (ATmatch(e, "BaseName(<term>)", &e1)) {
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e1 = evalExpr(state, e1);
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if (!ATmatch(e1, "<str>", &s1))
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throw badTerm("string expected", e1);
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return ATmake("<str>", baseNameOf(s1).c_str());
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}
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/* Barf. */
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throw badTerm("invalid expression", e);
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}
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static Expr evalExpr(EvalState & state, Expr e)
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{
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Nest nest(lvlVomit, format("evaluating expression: %1%") % printTerm(e));
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/* Consult the memo table to quickly get the normal form of
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previously evaluated expressions. */
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NormalForms::iterator i = state.normalForms.find(e);
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if (i != state.normalForms.end()) {
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if (i->second == state.blackHole)
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throw badTerm("infinite recursion", e);
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return i->second;
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}
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/* Otherwise, evaluate and memoize. */
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state.normalForms[e] = state.blackHole;
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Expr nf = evalExpr2(state, e);
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state.normalForms[e] = nf;
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return nf;
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}
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static Expr evalFile(EvalState & state, string relPath)
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{
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string path = searchPath(state.searchDirs, relPath);
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Nest nest(lvlTalkative, format("evaluating file `%1%'") % path);
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Expr e = ATreadFromNamedFile(path.c_str());
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if (!e)
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throw Error(format("unable to read a term from `%1%'") % path);
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return evalExpr(state, e);
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}
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static Expr evalStdin(EvalState & state)
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{
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Nest nest(lvlTalkative, format("evaluating standard input"));
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Expr e = ATreadFromFile(stdin);
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if (!e)
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throw Error(format("unable to read a term from stdin"));
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return evalExpr(state, e);
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}
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static void printFSId(EvalState & state, Expr e)
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{
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ATermList es;
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char * s;
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if (ATmatch(e, "FSId(<str>)", &s)) {
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cout << format("%1%\n") % s;
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}
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else if (ATmatch(e, "[<list>]", &es)) {
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while (!ATisEmpty(es)) {
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printFSId(state, evalExpr(state, ATgetFirst(es)));
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es = ATgetNext(es);
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}
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}
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else throw badTerm("top level does not evaluate to a (list of) Nix expression(s)", e);
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}
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void run(Strings args)
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{
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openDB();
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EvalState state;
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Strings files;
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bool readStdin = false;
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state.searchDirs.push_back(".");
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state.searchDirs.push_back(nixDataDir + "/fix");
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for (Strings::iterator it = args.begin();
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it != args.end(); )
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{
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string arg = *it++;
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if (arg == "--includedir" || arg == "-I") {
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if (it == args.end())
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throw UsageError(format("argument required in `%1%'") % arg);
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state.searchDirs.push_back(*it++);
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}
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else if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else if (arg == "-")
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readStdin = true;
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else if (arg[0] == '-')
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throw UsageError(format("unknown flag `%1%`") % arg);
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else
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files.push_back(arg);
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}
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if (readStdin) {
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Expr e = evalStdin(state);
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printFSId(state, e);
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}
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for (Strings::iterator it = files.begin();
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it != files.end(); it++)
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{
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Expr e = evalFile(state, *it);
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printFSId(state, e);
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}
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}
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string programId = "fix";
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