310 lines
8.5 KiB
C++
310 lines
8.5 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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struct EvalState
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{
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Strings searchDirs;
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NormalForms normalForms;
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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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if (ATmatch(e, "Lam(<str>, <term>)", &s, &e2))
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if (x == s)
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return e;
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/* !!! unfair substitutions */
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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 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, "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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parseFState(e);
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return ATmake("FSId(<str>)",
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((string) writeTerm(e, "")).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, "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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/* 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.path = dstPath;
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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.push_back(id);
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fs.slice.elems.push_back(elem);
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FSId termId = hashString("producer-" + (string) id
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+ "-" + dstPath);
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writeTerm(unparseFState(fs), "", termId);
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return ATmake("FSId(<str>)", ((string) termId).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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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 (ATmatch(value, "FSId(<str>)", &s1)) {
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FSId id = parseHash(s1);
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Strings paths = fstatePaths(id, false);
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if (paths.size() != 1) abort();
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string path = *(paths.begin());
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fs.derive.inputs.push_back(id);
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fs.derive.env.push_back(StringPair(key, path));
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if (key == "build") fs.derive.builder = path;
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}
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else if (ATmatch(value, "<str>", &s1)) {
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if (key == "name") name = s1;
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if (key == "id") outId = parseHash(s1);
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fs.derive.env.push_back(StringPair(key, s1));
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}
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else throw badTerm("invalid package argument", value);
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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 (outId == FSId())
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outId = hashTerm(unparseFState(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.push_back(StringPair("out", outPath));
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fs.derive.outputs.push_back(DeriveOutput(outPath, outId));
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debug(format("%1%: %2%") % (string) outId % name);
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/* Write the resulting term into the Nix store directory. */
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FSId termId = hashString("producer-" + (string) outId
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+ "-" + outPath);
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writeTerm(unparseFState(fs), "-d-" + name, termId);
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return ATmake("FSId(<str>)", ((string) termId).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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/* 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()) return i->second;
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/* Otherwise, evaluate and memoize. */
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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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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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void run(Strings args)
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{
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EvalState state;
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Strings files;
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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[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 (files.empty()) throw UsageError("no files specified");
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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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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 throw badTerm("top level is not a package", e);
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}
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}
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string programId = "fix";
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