mirror of
https://github.com/NixOS/nix
synced 2025-07-06 21:41:48 +02:00
Unify and refactor value printing
Previously, there were two mostly-identical value printers -- one in `libexpr/eval.cc` (which didn't force values) and one in `libcmd/repl.cc` (which did force values and also printed ANSI color codes). This PR unifies both of these printers into `print.cc` and provides a `PrintOptions` struct for controlling the output, which allows for toggling whether values are forced, whether repeated values are tracked, and whether ANSI color codes are displayed. Additionally, `PrintOptions` allows tuning the maximum number of attributes, list items, and bytes in a string that will be displayed; this makes it ideal for contexts where printing too much output (e.g. all of Nixpkgs) is distracting. (As requested by @roberth in https://github.com/NixOS/nix/pull/9554#issuecomment-1845095735) Please read the tests for example output. Future work: - It would be nice to provide this function as a builtin, perhaps `builtins.toStringDebug` -- a printing function that never fails would be useful when debugging Nix code. - It would be nice to support customizing `PrintOptions` members on the command line, e.g. `--option to-string-max-attrs 1000`.
This commit is contained in:
Rebecca Turner
parent
c9125603a5
commit
0fa08b4516
18 changed files with 1174 additions and 278 deletions
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@ -1,6 +1,7 @@
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#include "tests/libexpr.hh"
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#include "value.hh"
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#include "print.hh"
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namespace nix {
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@ -12,7 +13,7 @@ struct ValuePrintingTests : LibExprTest
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void test(Value v, std::string_view expected, A... args)
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{
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std::stringstream out;
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v.print(state.symbols, out, args...);
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v.print(state, out, args...);
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ASSERT_EQ(out.str(), expected);
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}
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};
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@ -84,7 +85,7 @@ TEST_F(ValuePrintingTests, tList)
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vList.bigList.elems[1] = &vTwo;
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vList.bigList.size = 3;
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test(vList, "[ 1 2 (nullptr) ]");
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test(vList, "[ 1 2 «nullptr» ]");
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}
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TEST_F(ValuePrintingTests, vThunk)
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@ -92,7 +93,7 @@ TEST_F(ValuePrintingTests, vThunk)
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Value vThunk;
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vThunk.mkThunk(nullptr, nullptr);
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test(vThunk, "<CODE>");
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test(vThunk, "«thunk»");
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}
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TEST_F(ValuePrintingTests, vApp)
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@ -100,32 +101,55 @@ TEST_F(ValuePrintingTests, vApp)
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Value vApp;
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vApp.mkApp(nullptr, nullptr);
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test(vApp, "<CODE>");
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test(vApp, "«thunk»");
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}
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TEST_F(ValuePrintingTests, vLambda)
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{
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Value vLambda;
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vLambda.mkLambda(nullptr, nullptr);
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Env env {
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.up = nullptr,
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.values = { }
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};
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PosTable::Origin origin((std::monostate()));
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auto posIdx = state.positions.add(origin, 1, 1);
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auto body = ExprInt(0);
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auto formals = Formals {};
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test(vLambda, "<LAMBDA>");
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ExprLambda eLambda(posIdx, createSymbol("a"), &formals, &body);
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Value vLambda;
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vLambda.mkLambda(&env, &eLambda);
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test(vLambda, "«lambda @ «none»:1:1»");
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eLambda.setName(createSymbol("puppy"));
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test(vLambda, "«lambda puppy @ «none»:1:1»");
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}
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TEST_F(ValuePrintingTests, vPrimOp)
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{
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Value vPrimOp;
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PrimOp primOp{};
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PrimOp primOp{
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.name = "puppy"
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};
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vPrimOp.mkPrimOp(&primOp);
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test(vPrimOp, "<PRIMOP>");
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test(vPrimOp, "«primop puppy»");
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}
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TEST_F(ValuePrintingTests, vPrimOpApp)
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{
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Value vPrimOpApp;
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vPrimOpApp.mkPrimOpApp(nullptr, nullptr);
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PrimOp primOp{
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.name = "puppy"
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};
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Value vPrimOp;
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vPrimOp.mkPrimOp(&primOp);
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test(vPrimOpApp, "<PRIMOP-APP>");
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Value vPrimOpApp;
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vPrimOpApp.mkPrimOpApp(&vPrimOp, nullptr);
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test(vPrimOpApp, "«partially applied primop puppy»");
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}
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TEST_F(ValuePrintingTests, vExternal)
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@ -176,9 +200,14 @@ TEST_F(ValuePrintingTests, depthAttrs)
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Value vTwo;
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vTwo.mkInt(2);
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BindingsBuilder builderEmpty(state, state.allocBindings(0));
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Value vAttrsEmpty;
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vAttrsEmpty.mkAttrs(builderEmpty.finish());
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BindingsBuilder builder(state, state.allocBindings(10));
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builder.insert(state.symbols.create("one"), &vOne);
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builder.insert(state.symbols.create("two"), &vTwo);
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builder.insert(state.symbols.create("nested"), &vAttrsEmpty);
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Value vAttrs;
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vAttrs.mkAttrs(builder.finish());
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@ -191,10 +220,10 @@ TEST_F(ValuePrintingTests, depthAttrs)
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Value vNested;
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vNested.mkAttrs(builder2.finish());
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test(vNested, "{ nested = «too deep»; one = «too deep»; two = «too deep»; }", false, 1);
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test(vNested, "{ nested = { one = «too deep»; two = «too deep»; }; one = 1; two = 2; }", false, 2);
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test(vNested, "{ nested = { one = 1; two = 2; }; one = 1; two = 2; }", false, 3);
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test(vNested, "{ nested = { one = 1; two = 2; }; one = 1; two = 2; }", false, 4);
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test(vNested, "{ nested = { ... }; one = 1; two = 2; }", PrintOptions { .maxDepth = 1 });
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test(vNested, "{ nested = { nested = { ... }; one = 1; two = 2; }; one = 1; two = 2; }", PrintOptions { .maxDepth = 2 });
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test(vNested, "{ nested = { nested = { }; one = 1; two = 2; }; one = 1; two = 2; }", PrintOptions { .maxDepth = 3 });
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test(vNested, "{ nested = { nested = { }; one = 1; two = 2; }; one = 1; two = 2; }", PrintOptions { .maxDepth = 4 });
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}
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TEST_F(ValuePrintingTests, depthList)
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@ -227,11 +256,561 @@ TEST_F(ValuePrintingTests, depthList)
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vList.bigList.elems[2] = &vNested;
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vList.bigList.size = 3;
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test(vList, "[ «too deep» «too deep» «too deep» ]", false, 1);
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test(vList, "[ 1 2 { nested = «too deep»; one = «too deep»; two = «too deep»; } ]", false, 2);
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test(vList, "[ 1 2 { nested = { one = «too deep»; two = «too deep»; }; one = 1; two = 2; } ]", false, 3);
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test(vList, "[ 1 2 { nested = { one = 1; two = 2; }; one = 1; two = 2; } ]", false, 4);
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test(vList, "[ 1 2 { nested = { one = 1; two = 2; }; one = 1; two = 2; } ]", false, 5);
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test(vList, "[ 1 2 { ... } ]", PrintOptions { .maxDepth = 1 });
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test(vList, "[ 1 2 { nested = { ... }; one = 1; two = 2; } ]", PrintOptions { .maxDepth = 2 });
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test(vList, "[ 1 2 { nested = { one = 1; two = 2; }; one = 1; two = 2; } ]", PrintOptions { .maxDepth = 3 });
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test(vList, "[ 1 2 { nested = { one = 1; two = 2; }; one = 1; two = 2; } ]", PrintOptions { .maxDepth = 4 });
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test(vList, "[ 1 2 { nested = { one = 1; two = 2; }; one = 1; two = 2; } ]", PrintOptions { .maxDepth = 5 });
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}
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struct StringPrintingTests : LibExprTest
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{
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template<class... A>
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void test(std::string_view literal, std::string_view expected, unsigned int maxLength, A... args)
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{
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Value v;
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v.mkString(literal);
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std::stringstream out;
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printValue(state, out, v, PrintOptions {
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.maxStringLength = maxLength
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});
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ASSERT_EQ(out.str(), expected);
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}
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};
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TEST_F(StringPrintingTests, maxLengthTruncation)
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{
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test("abcdefghi", "\"abcdefghi\"", 10);
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test("abcdefghij", "\"abcdefghij\"", 10);
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test("abcdefghijk", "\"abcdefghij\" «1 byte elided»", 10);
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test("abcdefghijkl", "\"abcdefghij\" «2 bytes elided»", 10);
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test("abcdefghijklm", "\"abcdefghij\" «3 bytes elided»", 10);
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}
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// Check that printing an attrset shows 'important' attributes like `type`
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// first, but only reorder the attrs when we have a maxAttrs budget.
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TEST_F(ValuePrintingTests, attrsTypeFirst)
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{
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Value vType;
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vType.mkString("puppy");
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Value vApple;
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vApple.mkString("apple");
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BindingsBuilder builder(state, state.allocBindings(10));
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builder.insert(state.symbols.create("type"), &vType);
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builder.insert(state.symbols.create("apple"), &vApple);
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Value vAttrs;
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vAttrs.mkAttrs(builder.finish());
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test(vAttrs,
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"{ type = \"puppy\"; apple = \"apple\"; }",
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PrintOptions {
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.maxAttrs = 100
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});
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test(vAttrs,
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"{ apple = \"apple\"; type = \"puppy\"; }",
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PrintOptions { });
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}
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TEST_F(ValuePrintingTests, ansiColorsInt)
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{
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Value v;
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v.mkInt(10);
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test(v,
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ANSI_CYAN "10" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsFloat)
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{
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Value v;
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v.mkFloat(1.6);
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test(v,
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ANSI_CYAN "1.6" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsBool)
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{
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Value v;
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v.mkBool(true);
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test(v,
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ANSI_CYAN "true" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsString)
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{
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Value v;
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v.mkString("puppy");
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test(v,
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ANSI_MAGENTA "\"puppy\"" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsStringElided)
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{
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Value v;
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v.mkString("puppy");
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test(v,
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ANSI_MAGENTA "\"pup\"" ANSI_FAINT " «2 bytes elided»" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true,
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.maxStringLength = 3
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsPath)
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{
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Value v;
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v.mkPath(state.rootPath(CanonPath("puppy")));
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test(v,
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ANSI_GREEN "/puppy" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsNull)
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{
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Value v;
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v.mkNull();
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test(v,
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ANSI_CYAN "null" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsAttrs)
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{
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Value vOne;
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vOne.mkInt(1);
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Value vTwo;
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vTwo.mkInt(2);
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BindingsBuilder builder(state, state.allocBindings(10));
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builder.insert(state.symbols.create("one"), &vOne);
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builder.insert(state.symbols.create("two"), &vTwo);
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Value vAttrs;
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vAttrs.mkAttrs(builder.finish());
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test(vAttrs,
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"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; two = " ANSI_CYAN "2" ANSI_NORMAL "; }",
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PrintOptions {
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.ansiColors = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsDerivation)
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{
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Value vDerivation;
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vDerivation.mkString("derivation");
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BindingsBuilder builder(state, state.allocBindings(10));
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builder.insert(state.sType, &vDerivation);
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Value vAttrs;
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vAttrs.mkAttrs(builder.finish());
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test(vAttrs,
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ANSI_GREEN "«derivation»" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true,
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.force = true,
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.derivationPaths = true
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});
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test(vAttrs,
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"{ type = " ANSI_MAGENTA "\"derivation\"" ANSI_NORMAL "; }",
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PrintOptions {
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.ansiColors = true,
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.force = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsError)
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{
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Value throw_ = state.getBuiltin("throw");
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Value message;
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message.mkString("uh oh!");
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Value vError;
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vError.mkApp(&throw_, &message);
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test(vError,
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ANSI_RED
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"«"
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ANSI_RED
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"error:"
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ANSI_NORMAL
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"\n … while calling the '"
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ANSI_MAGENTA
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"throw"
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ANSI_NORMAL
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"' builtin\n\n "
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ANSI_RED
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"error:"
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ANSI_NORMAL
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" uh oh!»"
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ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true,
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.force = true,
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsDerivationError)
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{
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Value throw_ = state.getBuiltin("throw");
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Value message;
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message.mkString("uh oh!");
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Value vError;
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vError.mkApp(&throw_, &message);
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Value vDerivation;
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vDerivation.mkString("derivation");
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BindingsBuilder builder(state, state.allocBindings(10));
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builder.insert(state.sType, &vDerivation);
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builder.insert(state.sDrvPath, &vError);
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Value vAttrs;
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vAttrs.mkAttrs(builder.finish());
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test(vAttrs,
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"{ drvPath = "
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ANSI_RED
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"«"
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ANSI_RED
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"error:"
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ANSI_NORMAL
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"\n … while calling the '"
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ANSI_MAGENTA
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"throw"
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ANSI_NORMAL
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"' builtin\n\n "
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ANSI_RED
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"error:"
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ANSI_NORMAL
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" uh oh!»"
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ANSI_NORMAL
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"; type = "
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ANSI_MAGENTA
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"\"derivation\""
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ANSI_NORMAL
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"; }",
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PrintOptions {
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.ansiColors = true,
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.force = true
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});
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test(vAttrs,
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ANSI_RED
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"«"
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ANSI_RED
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"error:"
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ANSI_NORMAL
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"\n … while calling the '"
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ANSI_MAGENTA
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"throw"
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ANSI_NORMAL
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"' builtin\n\n "
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ANSI_RED
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"error:"
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ANSI_NORMAL
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" uh oh!»"
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ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true,
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.force = true,
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.derivationPaths = true,
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsAssert)
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{
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ExprVar eFalse(state.symbols.create("false"));
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eFalse.bindVars(state, state.staticBaseEnv);
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ExprInt eInt(1);
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ExprAssert expr(noPos, &eFalse, &eInt);
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Value v;
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state.mkThunk_(v, &expr);
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test(v,
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ANSI_RED "«" ANSI_RED "error:" ANSI_NORMAL " assertion '" ANSI_MAGENTA "false" ANSI_NORMAL "' failed»" ANSI_NORMAL,
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PrintOptions {
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.ansiColors = true,
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.force = true
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});
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}
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TEST_F(ValuePrintingTests, ansiColorsList)
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{
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Value vOne;
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vOne.mkInt(1);
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Value vTwo;
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vTwo.mkInt(2);
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Value vList;
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state.mkList(vList, 5);
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vList.bigList.elems[0] = &vOne;
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vList.bigList.elems[1] = &vTwo;
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vList.bigList.size = 3;
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test(vList,
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"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_CYAN "2" ANSI_NORMAL " " ANSI_MAGENTA "«nullptr»" ANSI_NORMAL " ]",
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PrintOptions {
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.ansiColors = true
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});
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}
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||||
TEST_F(ValuePrintingTests, ansiColorsLambda)
|
||||
{
|
||||
Env env {
|
||||
.up = nullptr,
|
||||
.values = { }
|
||||
};
|
||||
PosTable::Origin origin((std::monostate()));
|
||||
auto posIdx = state.positions.add(origin, 1, 1);
|
||||
auto body = ExprInt(0);
|
||||
auto formals = Formals {};
|
||||
|
||||
ExprLambda eLambda(posIdx, createSymbol("a"), &formals, &body);
|
||||
|
||||
Value vLambda;
|
||||
vLambda.mkLambda(&env, &eLambda);
|
||||
|
||||
test(vLambda,
|
||||
ANSI_BLUE "«lambda @ «none»:1:1»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.force = true
|
||||
});
|
||||
|
||||
eLambda.setName(createSymbol("puppy"));
|
||||
|
||||
test(vLambda,
|
||||
ANSI_BLUE "«lambda puppy @ «none»:1:1»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.force = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsPrimOp)
|
||||
{
|
||||
PrimOp primOp{
|
||||
.name = "puppy"
|
||||
};
|
||||
Value v;
|
||||
v.mkPrimOp(&primOp);
|
||||
|
||||
test(v,
|
||||
ANSI_BLUE "«primop puppy»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsPrimOpApp)
|
||||
{
|
||||
PrimOp primOp{
|
||||
.name = "puppy"
|
||||
};
|
||||
Value vPrimOp;
|
||||
vPrimOp.mkPrimOp(&primOp);
|
||||
|
||||
Value v;
|
||||
v.mkPrimOpApp(&vPrimOp, nullptr);
|
||||
|
||||
test(v,
|
||||
ANSI_BLUE "«partially applied primop puppy»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsThunk)
|
||||
{
|
||||
Value v;
|
||||
v.mkThunk(nullptr, nullptr);
|
||||
|
||||
test(v,
|
||||
ANSI_MAGENTA "«thunk»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsBlackhole)
|
||||
{
|
||||
Value v;
|
||||
v.mkBlackhole();
|
||||
|
||||
test(v,
|
||||
ANSI_RED "«potential infinite recursion»" ANSI_NORMAL,
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsAttrsRepeated)
|
||||
{
|
||||
BindingsBuilder emptyBuilder(state, state.allocBindings(1));
|
||||
|
||||
Value vEmpty;
|
||||
vEmpty.mkAttrs(emptyBuilder.finish());
|
||||
|
||||
BindingsBuilder builder(state, state.allocBindings(10));
|
||||
builder.insert(state.symbols.create("a"), &vEmpty);
|
||||
builder.insert(state.symbols.create("b"), &vEmpty);
|
||||
|
||||
Value vAttrs;
|
||||
vAttrs.mkAttrs(builder.finish());
|
||||
|
||||
test(vAttrs,
|
||||
"{ a = { }; b = " ANSI_MAGENTA "«repeated»" ANSI_NORMAL "; }",
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsListRepeated)
|
||||
{
|
||||
BindingsBuilder emptyBuilder(state, state.allocBindings(1));
|
||||
|
||||
Value vEmpty;
|
||||
vEmpty.mkAttrs(emptyBuilder.finish());
|
||||
|
||||
Value vList;
|
||||
state.mkList(vList, 3);
|
||||
vList.bigList.elems[0] = &vEmpty;
|
||||
vList.bigList.elems[1] = &vEmpty;
|
||||
vList.bigList.size = 2;
|
||||
|
||||
test(vList,
|
||||
"[ { } " ANSI_MAGENTA "«repeated»" ANSI_NORMAL " ]",
|
||||
PrintOptions {
|
||||
.ansiColors = true
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, listRepeated)
|
||||
{
|
||||
BindingsBuilder emptyBuilder(state, state.allocBindings(1));
|
||||
|
||||
Value vEmpty;
|
||||
vEmpty.mkAttrs(emptyBuilder.finish());
|
||||
|
||||
Value vList;
|
||||
state.mkList(vList, 3);
|
||||
vList.bigList.elems[0] = &vEmpty;
|
||||
vList.bigList.elems[1] = &vEmpty;
|
||||
vList.bigList.size = 2;
|
||||
|
||||
test(vList, "[ { } «repeated» ]", PrintOptions { });
|
||||
test(vList,
|
||||
"[ { } { } ]",
|
||||
PrintOptions {
|
||||
.trackRepeated = false
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsAttrsElided)
|
||||
{
|
||||
Value vOne;
|
||||
vOne.mkInt(1);
|
||||
|
||||
Value vTwo;
|
||||
vTwo.mkInt(2);
|
||||
|
||||
BindingsBuilder builder(state, state.allocBindings(10));
|
||||
builder.insert(state.symbols.create("one"), &vOne);
|
||||
builder.insert(state.symbols.create("two"), &vTwo);
|
||||
|
||||
Value vAttrs;
|
||||
vAttrs.mkAttrs(builder.finish());
|
||||
|
||||
test(vAttrs,
|
||||
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT " «1 attribute elided»" ANSI_NORMAL "}",
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.maxAttrs = 1
|
||||
});
|
||||
|
||||
Value vThree;
|
||||
vThree.mkInt(3);
|
||||
|
||||
builder.insert(state.symbols.create("three"), &vThree);
|
||||
vAttrs.mkAttrs(builder.finish());
|
||||
|
||||
test(vAttrs,
|
||||
"{ one = " ANSI_CYAN "1" ANSI_NORMAL "; " ANSI_FAINT " «2 attributes elided»" ANSI_NORMAL "}",
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.maxAttrs = 1
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(ValuePrintingTests, ansiColorsListElided)
|
||||
{
|
||||
BindingsBuilder emptyBuilder(state, state.allocBindings(1));
|
||||
|
||||
Value vOne;
|
||||
vOne.mkInt(1);
|
||||
|
||||
Value vTwo;
|
||||
vTwo.mkInt(2);
|
||||
|
||||
Value vList;
|
||||
state.mkList(vList, 4);
|
||||
vList.bigList.elems[0] = &vOne;
|
||||
vList.bigList.elems[1] = &vTwo;
|
||||
vList.bigList.size = 2;
|
||||
|
||||
test(vList,
|
||||
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT " «1 item elided»" ANSI_NORMAL "]",
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.maxListItems = 1
|
||||
});
|
||||
|
||||
Value vThree;
|
||||
vThree.mkInt(3);
|
||||
|
||||
vList.bigList.elems[2] = &vThree;
|
||||
vList.bigList.size = 3;
|
||||
|
||||
test(vList,
|
||||
"[ " ANSI_CYAN "1" ANSI_NORMAL " " ANSI_FAINT " «2 items elided»" ANSI_NORMAL "]",
|
||||
PrintOptions {
|
||||
.ansiColors = true,
|
||||
.maxListItems = 1
|
||||
});
|
||||
}
|
||||
|
||||
} // namespace nix
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue