forked from lix-project/lix
bddc83a148
;-) * Channels: fix channels that are plain lists of derivations (like strategoxt-unstable) instead of functions (like nixpkgs-unstable). This fixes the error message "error: the left-hand side of the function call is neither a function nor a primop (built-in operation) but a list".
947 lines
29 KiB
C++
947 lines
29 KiB
C++
#include "misc.hh"
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#include "eval.hh"
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#include "globals.hh"
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#include "store-api.hh"
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#include "util.hh"
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#include "archive.hh"
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#include "expr-to-xml.hh"
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#include "nixexpr-ast.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <algorithm>
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namespace nix {
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/*************************************************************
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* Constants
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*************************************************************/
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static Expr prim_builtins(EvalState & state, const ATermVector & args)
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{
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/* Return an attribute set containing all primops. This allows
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Nix expressions to test for new primops and take appropriate
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action if they're not available. For instance, rather than
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calling a primop `foo' directly, they could say `if builtins ?
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foo then builtins.foo ... else ...'. */
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ATermMap builtins(state.primOps.size());
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for (ATermMap::const_iterator i = state.primOps.begin();
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i != state.primOps.end(); ++i)
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{
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string name = aterm2String(i->key);
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if (string(name, 0, 2) == "__")
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name = string(name, 2);
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/* !!! should use makePrimOp here, I guess. */
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builtins.set(toATerm(name), makeAttrRHS(makeVar(i->key), makeNoPos()));
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}
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return makeAttrs(builtins);
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}
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/* Boolean constructors. */
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static Expr prim_true(EvalState & state, const ATermVector & args)
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{
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return eTrue;
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}
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static Expr prim_false(EvalState & state, const ATermVector & args)
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{
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return eFalse;
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}
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/* Return the null value. */
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static Expr prim_null(EvalState & state, const ATermVector & args)
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{
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return makeNull();
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}
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/* Return a string constant representing the current platform. Note!
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that differs between platforms, so Nix expressions using
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`__currentSystem' can evaluate to different values on different
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platforms. */
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static Expr prim_currentSystem(EvalState & state, const ATermVector & args)
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{
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return makeStr(thisSystem);
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}
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static Expr prim_currentTime(EvalState & state, const ATermVector & args)
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{
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return ATmake("Int(<int>)", time(0));
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}
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/*************************************************************
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* Miscellaneous
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*************************************************************/
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/* Load and evaluate an expression from path specified by the
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argument. */
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static Expr prim_import(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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Path path = coerceToPath(state, args[0], context);
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for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
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assert(isStorePath(*i));
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if (!store->isValidPath(*i))
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throw EvalError(format("cannot import `%1%', since path `%2%' is not valid")
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% path % *i);
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if (isDerivation(*i))
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store->buildDerivations(singleton<PathSet>(*i));
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}
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return evalFile(state, path);
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}
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/* Determine whether the argument is the null value. */
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static Expr prim_isNull(EvalState & state, const ATermVector & args)
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{
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return makeBool(matchNull(evalExpr(state, args[0])));
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}
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/* Determine whether the argument is a function. */
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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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}
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static Path findDependency(Path dir, string dep)
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{
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if (dep[0] == '/') throw EvalError(
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format("illegal absolute dependency `%1%'") % dep);
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Path p = canonPath(dir + "/" + dep);
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if (pathExists(p))
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return p;
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else
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return "";
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}
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/* Make path `p' relative to directory `pivot'. E.g.,
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relativise("/a/b/c", "a/b/x/y") => "../x/y". Both input paths
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should be in absolute canonical form. */
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static string relativise(Path pivot, Path p)
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{
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assert(pivot.size() > 0 && pivot[0] == '/');
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assert(p.size() > 0 && p[0] == '/');
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if (pivot == p) return ".";
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/* `p' is in `pivot'? */
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Path pivot2 = pivot + "/";
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if (p.substr(0, pivot2.size()) == pivot2) {
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return p.substr(pivot2.size());
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}
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/* Otherwise, `p' is in a parent of `pivot'. Find up till which
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path component `p' and `pivot' match, and add an appropriate
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number of `..' components. */
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string::size_type i = 1;
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while (1) {
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string::size_type j = pivot.find('/', i);
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if (j == string::npos) break;
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j++;
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if (pivot.substr(0, j) != p.substr(0, j)) break;
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i = j;
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}
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string prefix;
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unsigned int slashes = count(pivot.begin() + i, pivot.end(), '/') + 1;
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while (slashes--) {
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prefix += "../";
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}
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return prefix + p.substr(i);
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}
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static Expr prim_dependencyClosure(EvalState & state, const ATermVector & args)
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{
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startNest(nest, lvlDebug, "finding dependencies");
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Expr attrs = evalExpr(state, args[0]);
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/* Get the start set. */
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Expr startSet = queryAttr(attrs, "startSet");
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if (!startSet) throw EvalError("attribute `startSet' required");
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ATermList startSet2 = evalList(state, startSet);
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Path pivot;
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PathSet workSet;
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for (ATermIterator i(startSet2); i; ++i) {
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PathSet context; /* !!! what to do? */
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Path p = coerceToPath(state, *i, context);
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workSet.insert(p);
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pivot = dirOf(p);
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}
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/* Get the search path. */
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PathSet searchPath;
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Expr e = queryAttr(attrs, "searchPath");
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if (e) {
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ATermList list = evalList(state, e);
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for (ATermIterator i(list); i; ++i) {
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PathSet context; /* !!! what to do? */
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Path p = coerceToPath(state, *i, context);
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searchPath.insert(p);
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}
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}
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Expr scanner = queryAttr(attrs, "scanner");
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if (!scanner) throw EvalError("attribute `scanner' required");
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/* Construct the dependency closure by querying the dependency of
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each path in `workSet', adding the dependencies to
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`workSet'. */
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PathSet doneSet;
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while (!workSet.empty()) {
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Path path = *(workSet.begin());
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workSet.erase(path);
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if (doneSet.find(path) != doneSet.end()) continue;
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doneSet.insert(path);
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try {
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/* Call the `scanner' function with `path' as argument. */
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debug(format("finding dependencies in `%1%'") % path);
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ATermList deps = evalList(state, makeCall(scanner, makeStr(path)));
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/* Try to find the dependencies relative to the `path'. */
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for (ATermIterator i(deps); i; ++i) {
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string s = evalStringNoCtx(state, *i);
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Path dep = findDependency(dirOf(path), s);
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if (dep == "") {
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for (PathSet::iterator j = searchPath.begin();
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j != searchPath.end(); ++j)
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{
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dep = findDependency(*j, s);
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if (dep != "") break;
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}
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}
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if (dep == "")
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debug(format("did NOT find dependency `%1%'") % s);
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else {
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debug(format("found dependency `%1%'") % dep);
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workSet.insert(dep);
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}
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}
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} catch (Error & e) {
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e.addPrefix(format("while finding dependencies in `%1%':\n")
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% path);
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throw;
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}
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}
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/* Return a list of the dependencies we've just found. */
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ATermList deps = ATempty;
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for (PathSet::iterator i = doneSet.begin(); i != doneSet.end(); ++i) {
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deps = ATinsert(deps, makeStr(relativise(pivot, *i)));
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deps = ATinsert(deps, makeStr(*i));
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}
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debug(format("dependency list is `%1%'") % makeList(deps));
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return makeList(deps);
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}
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static Expr prim_abort(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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throw Abort(format("evaluation aborted with the following error message: `%1%'") %
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evalString(state, args[0], context));
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}
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static Expr prim_throw(EvalState & state, const ATermVector & args)
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{
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PathSet context;
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throw ThrownError(format("user-thrown exception: `%1%'") %
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evalString(state, args[0], context));
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}
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/* Return an environment variable. Use with care. */
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static Expr prim_getEnv(EvalState & state, const ATermVector & args)
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{
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string name = evalStringNoCtx(state, args[0]);
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return makeStr(getEnv(name));
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}
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static Expr prim_relativise(EvalState & state, const ATermVector & args)
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{
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PathSet context; /* !!! what to do? */
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Path pivot = coerceToPath(state, args[0], context);
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Path path = coerceToPath(state, args[1], context);
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return makeStr(relativise(pivot, path));
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}
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/*************************************************************
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* Derivations
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*************************************************************/
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/* Returns the hash of a derivation modulo fixed-output
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subderivations. A fixed-output derivation is a derivation with one
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output (`out') for which an expected hash and hash algorithm are
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specified (using the `outputHash' and `outputHashAlgo'
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attributes). We don't want changes to such derivations to
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propagate upwards through the dependency graph, changing output
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paths everywhere.
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For instance, if we change the url in a call to the `fetchurl'
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function, we do not want to rebuild everything depending on it
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(after all, (the hash of) the file being downloaded is unchanged).
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So the *output paths* should not change. On the other hand, the
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*derivation store expression paths* should change to reflect the
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new dependency graph.
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That's what this function does: it returns a hash which is just the
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of the derivation ATerm, except that any input store expression
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paths have been replaced by the result of a recursive call to this
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function, and that for fixed-output derivations we return
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(basically) its outputHash. */
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static Hash hashDerivationModulo(EvalState & state, Derivation drv)
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{
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/* Return a fixed hash for fixed-output derivations. */
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if (drv.outputs.size() == 1) {
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DerivationOutputs::const_iterator i = drv.outputs.begin();
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if (i->first == "out" &&
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i->second.hash != "")
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{
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return hashString(htSHA256, "fixed:out:"
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+ i->second.hashAlgo + ":"
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+ i->second.hash + ":"
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+ i->second.path);
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}
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}
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/* For other derivations, replace the inputs paths with recursive
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calls to this function.*/
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DerivationInputs inputs2;
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for (DerivationInputs::iterator i = drv.inputDrvs.begin();
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i != drv.inputDrvs.end(); ++i)
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{
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Hash h = state.drvHashes[i->first];
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if (h.type == htUnknown) {
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Derivation drv2 = derivationFromPath(i->first);
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h = hashDerivationModulo(state, drv2);
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state.drvHashes[i->first] = h;
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}
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inputs2[printHash(h)] = i->second;
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}
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drv.inputDrvs = inputs2;
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return hashTerm(unparseDerivation(drv));
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}
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/* Construct (as a unobservable side effect) a Nix derivation
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expression that performs the derivation described by the argument
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set. Returns the original set extended with the following
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attributes: `outPath' containing the primary output path of the
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derivation; `drvPath' containing the path of the Nix expression;
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and `type' set to `derivation' to indicate that this is a
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derivation. */
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static Expr prim_derivationStrict(EvalState & state, const ATermVector & args)
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{
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startNest(nest, lvlVomit, "evaluating derivation");
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ATermMap attrs;
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queryAllAttrs(evalExpr(state, args[0]), attrs, true);
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/* Figure out the name already (for stack backtraces). */
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ATerm posDrvName;
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Expr eDrvName = attrs.get(toATerm("name"));
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if (!eDrvName)
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throw EvalError("required attribute `name' missing");
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if (!matchAttrRHS(eDrvName, eDrvName, posDrvName)) abort();
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string drvName;
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try {
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drvName = evalStringNoCtx(state, eDrvName);
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} catch (Error & e) {
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e.addPrefix(format("while evaluating the derivation attribute `name' at %1%:\n")
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% showPos(posDrvName));
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throw;
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}
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/* Build the derivation expression by processing the attributes. */
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Derivation drv;
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PathSet context;
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string outputHash;
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string outputHashAlgo;
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bool outputHashRecursive = false;
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for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
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string key = aterm2String(i->key);
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ATerm value;
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Expr pos;
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ATerm rhs = i->value;
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if (!matchAttrRHS(rhs, value, pos)) abort();
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startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
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try {
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/* The `args' attribute is special: it supplies the
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command-line arguments to the builder. */
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if (key == "args") {
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ATermList es;
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value = evalExpr(state, value);
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if (!matchList(value, es)) {
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static bool haveWarned = false;
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warnOnce(haveWarned, "the `args' attribute should evaluate to a list");
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es = flattenList(state, value);
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}
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for (ATermIterator i(es); i; ++i) {
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string s = coerceToString(state, *i, context, true);
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drv.args.push_back(s);
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}
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}
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/* All other attributes are passed to the builder through
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the environment. */
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else {
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string s = coerceToString(state, value, context, true);
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drv.env[key] = s;
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if (key == "builder") drv.builder = s;
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else if (key == "system") drv.platform = s;
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else if (key == "name") drvName = s;
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else if (key == "outputHash") outputHash = s;
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else if (key == "outputHashAlgo") outputHashAlgo = s;
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else if (key == "outputHashMode") {
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if (s == "recursive") outputHashRecursive = true;
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else if (s == "flat") outputHashRecursive = false;
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else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s);
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}
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}
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} catch (Error & e) {
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e.addPrefix(format("while evaluating the derivation attribute `%1%' at %2%:\n")
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% key % showPos(pos));
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e.addPrefix(format("while instantiating the derivation named `%1%' at %2%:\n")
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% drvName % showPos(posDrvName));
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throw;
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}
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}
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/* Everything in the context of the strings in the derivation
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attributes should be added as dependencies of the resulting
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derivation. */
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for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
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debug(format("derivation uses `%1%'") % *i);
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assert(isStorePath(*i));
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if (isDerivation(*i))
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drv.inputDrvs[*i] = singleton<StringSet>("out");
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else
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drv.inputSrcs.insert(*i);
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}
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/* Do we have all required attributes? */
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if (drv.builder == "")
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throw EvalError("required attribute `builder' missing");
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if (drv.platform == "")
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throw EvalError("required attribute `system' missing");
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/* If an output hash was given, check it. */
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if (outputHash == "")
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outputHashAlgo = "";
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else {
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HashType ht = parseHashType(outputHashAlgo);
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if (ht == htUnknown)
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throw EvalError(format("unknown hash algorithm `%1%'") % outputHashAlgo);
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Hash h(ht);
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if (outputHash.size() == h.hashSize * 2)
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/* hexadecimal representation */
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h = parseHash(ht, outputHash);
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else if (outputHash.size() == hashLength32(h))
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/* base-32 representation */
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h = parseHash32(ht, outputHash);
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else
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throw Error(format("hash `%1%' has wrong length for hash type `%2%'")
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% outputHash % outputHashAlgo);
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string s = outputHash;
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outputHash = printHash(h);
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if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo;
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}
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/* Check whether the derivation name is valid. */
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checkStoreName(drvName);
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if (isDerivation(drvName))
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throw EvalError(format("derivation names are not allowed to end in `%1%'")
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% drvExtension);
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/* Construct the "masked" derivation store expression, which is
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the final one except that in the list of outputs, the output
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paths are empty, and the corresponding environment variables
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have an empty value. This ensures that changes in the set of
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output names do get reflected in the hash. */
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drv.env["out"] = "";
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drv.outputs["out"] =
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DerivationOutput("", outputHashAlgo, outputHash);
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/* Use the masked derivation expression to compute the output
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path. */
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Path outPath = makeStorePath("output:out",
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hashDerivationModulo(state, drv), drvName);
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|
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/* Construct the final derivation store expression. */
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drv.env["out"] = outPath;
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drv.outputs["out"] =
|
|
DerivationOutput(outPath, outputHashAlgo, outputHash);
|
|
|
|
/* Write the resulting term into the Nix store directory. */
|
|
Path drvPath = writeDerivation(drv, drvName);
|
|
|
|
printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
|
|
% drvName % drvPath);
|
|
|
|
/* Optimisation, but required in read-only mode! because in that
|
|
case we don't actually write store expressions, so we can't
|
|
read them later. */
|
|
state.drvHashes[drvPath] = hashDerivationModulo(state, drv);
|
|
|
|
/* !!! assumes a single output */
|
|
ATermMap outAttrs(2);
|
|
outAttrs.set(toATerm("outPath"),
|
|
makeAttrRHS(makeStr(outPath, singleton<PathSet>(drvPath)), makeNoPos()));
|
|
outAttrs.set(toATerm("drvPath"),
|
|
makeAttrRHS(makeStr(drvPath, singleton<PathSet>(drvPath)), makeNoPos()));
|
|
|
|
return makeAttrs(outAttrs);
|
|
}
|
|
|
|
|
|
static Expr prim_derivationLazy(EvalState & state, const ATermVector & args)
|
|
{
|
|
Expr eAttrs = evalExpr(state, args[0]);
|
|
ATermMap attrs;
|
|
queryAllAttrs(eAttrs, attrs, true);
|
|
|
|
attrs.set(toATerm("type"),
|
|
makeAttrRHS(makeStr("derivation"), makeNoPos()));
|
|
|
|
Expr drvStrict = makeCall(makeVar(toATerm("derivation!")), eAttrs);
|
|
|
|
attrs.set(toATerm("outPath"),
|
|
makeAttrRHS(makeSelect(drvStrict, toATerm("outPath")), makeNoPos()));
|
|
attrs.set(toATerm("drvPath"),
|
|
makeAttrRHS(makeSelect(drvStrict, toATerm("drvPath")), makeNoPos()));
|
|
|
|
return makeAttrs(attrs);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Paths
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument to a path. !!! obsolete? */
|
|
static Expr prim_toPath(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string path = coerceToPath(state, args[0], context);
|
|
return makeStr(canonPath(path), context);
|
|
}
|
|
|
|
|
|
static Expr prim_pathExists(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = coerceToPath(state, args[0], context);
|
|
if (!context.empty())
|
|
throw EvalError(format("string `%1%' cannot refer to other paths") % path);
|
|
return makeBool(pathExists(path));
|
|
}
|
|
|
|
|
|
/* Return the base name of the given string, i.e., everything
|
|
following the last slash. */
|
|
static Expr prim_baseNameOf(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
return makeStr(baseNameOf(coerceToString(state, args[0], context)), context);
|
|
}
|
|
|
|
|
|
/* Return the directory of the given path, i.e., everything before the
|
|
last slash. Return either a path or a string depending on the type
|
|
of the argument. */
|
|
static Expr prim_dirOf(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Expr e = evalExpr(state, args[0]); ATerm dummy;
|
|
bool isPath = matchPath(e, dummy);
|
|
Path dir = dirOf(coerceToPath(state, e, context));
|
|
return isPath ? makePath(toATerm(dir)) : makeStr(dir, context);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Creating files
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument (which can be any Nix expression) to an XML
|
|
representation returned in a string. Not all Nix expressions can
|
|
be sensibly or completely represented (e.g., functions). */
|
|
static Expr prim_toXML(EvalState & state, const ATermVector & args)
|
|
{
|
|
std::ostringstream out;
|
|
PathSet context;
|
|
printTermAsXML(strictEvalExpr(state, args[0]), out, context);
|
|
return makeStr(out.str(), context);
|
|
}
|
|
|
|
|
|
/* Store a string in the Nix store as a source file that can be used
|
|
as an input by derivations. */
|
|
static Expr prim_toFile(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string name = evalStringNoCtx(state, args[0]);
|
|
string contents = evalString(state, args[1], context);
|
|
|
|
PathSet refs;
|
|
|
|
for (PathSet::iterator i = context.begin(); i != context.end(); ++i) {
|
|
if (isDerivation(*i))
|
|
throw EvalError(format("in `toFile': the file `%1%' cannot refer to derivation outputs") % name);
|
|
refs.insert(*i);
|
|
}
|
|
|
|
Path storePath = readOnlyMode
|
|
? computeStorePathForText(name, contents, refs)
|
|
: store->addTextToStore(name, contents, refs);
|
|
|
|
/* Note: we don't need to add `context' to the context of the
|
|
result, since `storePath' itself has references to the paths
|
|
used in args[1]. */
|
|
|
|
return makeStr(storePath, singleton<PathSet>(storePath));
|
|
}
|
|
|
|
|
|
struct FilterFromExpr : PathFilter
|
|
{
|
|
EvalState & state;
|
|
Expr filter;
|
|
|
|
FilterFromExpr(EvalState & state, Expr filter)
|
|
: state(state), filter(filter)
|
|
{
|
|
}
|
|
|
|
bool operator () (const Path & path)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
Expr call =
|
|
makeCall(
|
|
makeCall(filter, makeStr(path)),
|
|
makeStr(
|
|
S_ISREG(st.st_mode) ? "regular" :
|
|
S_ISDIR(st.st_mode) ? "directory" :
|
|
S_ISLNK(st.st_mode) ? "symlink" :
|
|
"unknown" /* not supported, will fail! */
|
|
));
|
|
|
|
return evalBool(state, call);
|
|
}
|
|
};
|
|
|
|
|
|
static Expr prim_filterSource(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
Path path = coerceToPath(state, args[1], context);
|
|
if (!context.empty())
|
|
throw EvalError(format("string `%1%' cannot refer to other paths") % path);
|
|
|
|
FilterFromExpr filter(state, args[0]);
|
|
|
|
Path dstPath = readOnlyMode
|
|
? computeStorePathForPath(path, false, false, "", filter).first
|
|
: store->addToStore(path, false, false, "", filter);
|
|
|
|
return makeStr(dstPath, singleton<PathSet>(dstPath));
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Attribute sets
|
|
*************************************************************/
|
|
|
|
|
|
/* Return the names of the attributes in an attribute set as a sorted
|
|
list of strings. */
|
|
static Expr prim_attrNames(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermMap attrs;
|
|
queryAllAttrs(evalExpr(state, args[0]), attrs);
|
|
|
|
StringSet names;
|
|
for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i)
|
|
names.insert(aterm2String(i->key));
|
|
|
|
ATermList list = ATempty;
|
|
for (StringSet::const_reverse_iterator i = names.rbegin();
|
|
i != names.rend(); ++i)
|
|
list = ATinsert(list, makeStr(*i, PathSet()));
|
|
|
|
return makeList(list);
|
|
}
|
|
|
|
|
|
/* Dynamic version of the `.' operator. */
|
|
static Expr prim_getAttr(EvalState & state, const ATermVector & args)
|
|
{
|
|
string attr = evalStringNoCtx(state, args[0]);
|
|
return evalExpr(state, makeSelect(args[1], toATerm(attr)));
|
|
}
|
|
|
|
|
|
/* Dynamic version of the `?' operator. */
|
|
static Expr prim_hasAttr(EvalState & state, const ATermVector & args)
|
|
{
|
|
string attr = evalStringNoCtx(state, args[0]);
|
|
return evalExpr(state, makeOpHasAttr(args[1], toATerm(attr)));
|
|
}
|
|
|
|
|
|
static Expr prim_removeAttrs(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermMap attrs;
|
|
queryAllAttrs(evalExpr(state, args[0]), attrs, true);
|
|
|
|
ATermList list = evalList(state, args[1]);
|
|
|
|
for (ATermIterator i(list); i; ++i)
|
|
/* It's not an error for *i not to exist. */
|
|
attrs.remove(toATerm(evalStringNoCtx(state, *i)));
|
|
|
|
return makeAttrs(attrs);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Lists
|
|
*************************************************************/
|
|
|
|
|
|
/* Determine whether the argument is a list. */
|
|
static Expr prim_isList(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list;
|
|
return makeBool(matchList(evalExpr(state, args[0]), list));
|
|
}
|
|
|
|
|
|
/* Return the first element of a list. */
|
|
static Expr prim_head(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list = evalList(state, args[0]);
|
|
if (ATisEmpty(list))
|
|
throw Error("`head' called on an empty list");
|
|
return evalExpr(state, ATgetFirst(list));
|
|
}
|
|
|
|
|
|
/* Return a list consisting of everything but the the first element of
|
|
a list. */
|
|
static Expr prim_tail(EvalState & state, const ATermVector & args)
|
|
{
|
|
ATermList list = evalList(state, args[0]);
|
|
if (ATisEmpty(list))
|
|
throw Error("`tail' called on an empty list");
|
|
return makeList(ATgetNext(list));
|
|
}
|
|
|
|
|
|
/* Apply a function to every element of a list. */
|
|
static Expr prim_map(EvalState & state, const ATermVector & args)
|
|
{
|
|
Expr fun = evalExpr(state, args[0]);
|
|
ATermList list = evalList(state, args[1]);
|
|
|
|
ATermList res = ATempty;
|
|
for (ATermIterator i(list); i; ++i)
|
|
res = ATinsert(res, makeCall(fun, *i));
|
|
|
|
return makeList(ATreverse(res));
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Integer arithmetic
|
|
*************************************************************/
|
|
|
|
|
|
static Expr prim_add(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeInt(i1 + i2);
|
|
}
|
|
|
|
|
|
static Expr prim_sub(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeInt(i1 - i2);
|
|
}
|
|
|
|
|
|
static Expr prim_lessThan(EvalState & state, const ATermVector & args)
|
|
{
|
|
int i1 = evalInt(state, args[0]);
|
|
int i2 = evalInt(state, args[1]);
|
|
return makeBool(i1 < i2);
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* String manipulation
|
|
*************************************************************/
|
|
|
|
|
|
/* Convert the argument to a string. Paths are *not* copied to the
|
|
store, so `toString /foo/bar' yields `"/foo/bar"', not
|
|
`"/nix/store/whatever..."'. */
|
|
static Expr prim_toString(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context, true, false);
|
|
return makeStr(s, context);
|
|
}
|
|
|
|
|
|
/* `substr start len str' returns the substring of `str' starting at
|
|
character position `min(start, stringLength str)' inclusive and
|
|
ending at `min(start + len, stringLength str)'. `start' must be
|
|
non-negative. */
|
|
static Expr prim_substring(EvalState & state, const ATermVector & args)
|
|
{
|
|
int start = evalInt(state, args[0]);
|
|
int len = evalInt(state, args[1]);
|
|
PathSet context;
|
|
string s = coerceToString(state, args[2], context);
|
|
|
|
if (start < 0) throw EvalError("negative start position in `substring'");
|
|
|
|
return makeStr(string(s, start, len), context);
|
|
}
|
|
|
|
|
|
static Expr prim_stringLength(EvalState & state, const ATermVector & args)
|
|
{
|
|
PathSet context;
|
|
string s = coerceToString(state, args[0], context);
|
|
return makeInt(s.size());
|
|
}
|
|
|
|
|
|
/*************************************************************
|
|
* Primop registration
|
|
*************************************************************/
|
|
|
|
|
|
void EvalState::addPrimOps()
|
|
{
|
|
addPrimOp("builtins", 0, prim_builtins);
|
|
|
|
// Constants
|
|
addPrimOp("true", 0, prim_true);
|
|
addPrimOp("false", 0, prim_false);
|
|
addPrimOp("null", 0, prim_null);
|
|
addPrimOp("__currentSystem", 0, prim_currentSystem);
|
|
addPrimOp("__currentTime", 0, prim_currentTime);
|
|
|
|
// Miscellaneous
|
|
addPrimOp("import", 1, prim_import);
|
|
addPrimOp("isNull", 1, prim_isNull);
|
|
addPrimOp("__isFunction", 1, prim_isFunction);
|
|
addPrimOp("dependencyClosure", 1, prim_dependencyClosure);
|
|
addPrimOp("abort", 1, prim_abort);
|
|
addPrimOp("throw", 1, prim_throw);
|
|
addPrimOp("__getEnv", 1, prim_getEnv);
|
|
|
|
addPrimOp("relativise", 2, prim_relativise);
|
|
|
|
// Derivations
|
|
addPrimOp("derivation!", 1, prim_derivationStrict);
|
|
addPrimOp("derivation", 1, prim_derivationLazy);
|
|
|
|
// Paths
|
|
addPrimOp("__toPath", 1, prim_toPath);
|
|
addPrimOp("__pathExists", 1, prim_pathExists);
|
|
addPrimOp("baseNameOf", 1, prim_baseNameOf);
|
|
addPrimOp("dirOf", 1, prim_dirOf);
|
|
|
|
// Creating files
|
|
addPrimOp("__toXML", 1, prim_toXML);
|
|
addPrimOp("__toFile", 2, prim_toFile);
|
|
addPrimOp("__filterSource", 2, prim_filterSource);
|
|
|
|
// Attribute sets
|
|
addPrimOp("__attrNames", 1, prim_attrNames);
|
|
addPrimOp("__getAttr", 2, prim_getAttr);
|
|
addPrimOp("__hasAttr", 2, prim_hasAttr);
|
|
addPrimOp("removeAttrs", 2, prim_removeAttrs);
|
|
|
|
// Lists
|
|
addPrimOp("__isList", 1, prim_isList);
|
|
addPrimOp("__head", 1, prim_head);
|
|
addPrimOp("__tail", 1, prim_tail);
|
|
addPrimOp("map", 2, prim_map);
|
|
|
|
// Integer arithmetic
|
|
addPrimOp("__add", 2, prim_add);
|
|
addPrimOp("__sub", 2, prim_sub);
|
|
addPrimOp("__lessThan", 2, prim_lessThan);
|
|
|
|
// String manipulation
|
|
addPrimOp("toString", 1, prim_toString);
|
|
addPrimOp("__substring", 3, prim_substring);
|
|
addPrimOp("__stringLength", 1, prim_stringLength);
|
|
}
|
|
|
|
|
|
}
|