diff options
| -rw-r--r-- | doc/manual/src/expressions/language-operators.md | 8 | ||||
| -rw-r--r-- | doc/manual/src/release-notes/rl-next.md | 2 | ||||
| -rw-r--r-- | src/libexpr/primops.cc | 26 | ||||
| -rw-r--r-- | tests/lang/eval-okay-sort.exp | 2 | ||||
| -rw-r--r-- | tests/lang/eval-okay-sort.nix | 14 |
5 files changed, 41 insertions, 11 deletions
diff --git a/doc/manual/src/expressions/language-operators.md b/doc/manual/src/expressions/language-operators.md index 6ab319039..268b44f4c 100644 --- a/doc/manual/src/expressions/language-operators.md +++ b/doc/manual/src/expressions/language-operators.md @@ -17,10 +17,10 @@ order of precedence (from strongest to weakest binding). | String Concatenation | *string1* `+` *string2* | left | String concatenation. | 7 | | Not | `!` *e* | none | Boolean negation. | 8 | | Update | *e1* `//` *e2* | right | Return a set consisting of the attributes in *e1* and *e2* (with the latter taking precedence over the former in case of equally named attributes). | 9 | -| Less Than | *e1* `<` *e2*, | none | Arithmetic comparison. | 10 | -| Less Than or Equal To | *e1* `<=` *e2* | none | Arithmetic comparison. | 10 | -| Greater Than | *e1* `>` *e2* | none | Arithmetic comparison. | 10 | -| Greater Than or Equal To | *e1* `>=` *e2* | none | Arithmetic comparison. | 10 | +| Less Than | *e1* `<` *e2*, | none | Arithmetic/lexicographic comparison. | 10 | +| Less Than or Equal To | *e1* `<=` *e2* | none | Arithmetic/lexicographic comparison. | 10 | +| Greater Than | *e1* `>` *e2* | none | Arithmetic/lexicographic comparison. | 10 | +| Greater Than or Equal To | *e1* `>=` *e2* | none | Arithmetic/lexicographic comparison. | 10 | | Equality | *e1* `==` *e2* | none | Equality. | 11 | | Inequality | *e1* `!=` *e2* | none | Inequality. | 11 | | Logical AND | *e1* `&&` *e2* | left | Logical AND. | 12 | diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md index 9a29938c2..26c7d2cce 100644 --- a/doc/manual/src/release-notes/rl-next.md +++ b/doc/manual/src/release-notes/rl-next.md @@ -3,3 +3,5 @@ * Binary cache stores now have a setting `compression-level`. * `nix develop` now has a flag `--unpack` to run `unpackPhase`. + +* Lists can now be compared lexicographically using the `<` operator. diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc index 24b931882..8cbeaa520 100644 --- a/src/libexpr/primops.cc +++ b/src/libexpr/primops.cc @@ -517,7 +517,11 @@ static RegisterPrimOp primop_isPath({ struct CompareValues { - bool operator () (const Value * v1, const Value * v2) const + EvalState & state; + + CompareValues(EvalState & state) : state(state) { }; + + bool operator () (Value * v1, Value * v2) const { if (v1->type() == nFloat && v2->type() == nInt) return v1->fpoint < v2->integer; @@ -534,6 +538,17 @@ struct CompareValues return strcmp(v1->string.s, v2->string.s) < 0; case nPath: return strcmp(v1->path, v2->path) < 0; + case nList: + // Lexicographic comparison + for (size_t i = 0;; i++) { + if (i == v2->listSize()) { + return false; + } else if (i == v1->listSize()) { + return true; + } else if (!state.eqValues(*v1->listElems()[i], *v2->listElems()[i])) { + return (*this)(v1->listElems()[i], v2->listElems()[i]); + } + } default: throw EvalError("cannot compare %1% with %2%", showType(*v1), showType(*v2)); } @@ -621,7 +636,8 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar ValueList res; // `doneKeys' doesn't need to be a GC root, because its values are // reachable from res. - set<Value *, CompareValues> doneKeys; + auto cmp = CompareValues(state); + set<Value *, decltype(cmp)> doneKeys(cmp); while (!workSet.empty()) { Value * e = *(workSet.begin()); workSet.pop_front(); @@ -2821,7 +2837,7 @@ static void prim_sort(EvalState & state, const Pos & pos, Value * * args, Value /* Optimization: if the comparator is lessThan, bypass callFunction. */ if (args[0]->isPrimOp() && args[0]->primOp->fun == prim_lessThan) - return CompareValues()(a, b); + return CompareValues(state)(a, b); Value * vs[] = {a, b}; Value vBool; @@ -3103,7 +3119,7 @@ static void prim_lessThan(EvalState & state, const Pos & pos, Value * * args, Va { state.forceValue(*args[0], pos); state.forceValue(*args[1], pos); - CompareValues comp; + CompareValues comp{state}; mkBool(v, comp(args[0], args[1])); } @@ -3693,7 +3709,7 @@ void EvalState::createBaseEnv() language feature gets added. It's not necessary to increase it when primops get added, because you can just use `builtins ? primOp' to check. */ - mkInt(v, 5); + mkInt(v, 6); addConstant("__langVersion", v); // Miscellaneous diff --git a/tests/lang/eval-okay-sort.exp b/tests/lang/eval-okay-sort.exp index 148b93516..899119e20 100644 --- a/tests/lang/eval-okay-sort.exp +++ b/tests/lang/eval-okay-sort.exp @@ -1 +1 @@ -[ [ 42 77 147 249 483 526 ] [ 526 483 249 147 77 42 ] [ "bar" "fnord" "foo" "xyzzy" ] [ { key = 1; value = "foo"; } { key = 1; value = "fnord"; } { key = 2; value = "bar"; } ] ] +[ [ 42 77 147 249 483 526 ] [ 526 483 249 147 77 42 ] [ "bar" "fnord" "foo" "xyzzy" ] [ { key = 1; value = "foo"; } { key = 1; value = "fnord"; } { key = 2; value = "bar"; } ] [ [ ] [ ] [ 1 ] [ 1 4 ] [ 1 5 ] [ 1 6 ] [ 2 ] [ 2 3 ] [ 3 ] [ 3 ] ] ] diff --git a/tests/lang/eval-okay-sort.nix b/tests/lang/eval-okay-sort.nix index 8299c3a4a..50aa78e40 100644 --- a/tests/lang/eval-okay-sort.nix +++ b/tests/lang/eval-okay-sort.nix @@ -4,5 +4,17 @@ with builtins; (sort (x: y: y < x) [ 483 249 526 147 42 77 ]) (sort lessThan [ "foo" "bar" "xyzzy" "fnord" ]) (sort (x: y: x.key < y.key) - [ { key = 1; value = "foo"; } { key = 2; value = "bar"; } { key = 1; value = "fnord"; } ]) + [ { key = 1; value = "foo"; } { key = 2; value = "bar"; } { key = 1; value = "fnord"; } ]) + (sort lessThan [ + [ 1 6 ] + [ ] + [ 2 3 ] + [ 3 ] + [ 1 5 ] + [ 2 ] + [ 1 ] + [ ] + [ 1 4 ] + [ 3 ] + ]) ] |