Add support for parsing YAML

packaging/dependencies.nix

@@ -174,6 +174,12 @@ scope: {
       ];
   });
 
+  rapidyaml = pkgs.rapidyaml.overrideAttrs(old: old // {
+    cmakeFlags = [
+      "-DRYML_WITH_TAB_TOKENS=ON"
+    ];
+  });
+
   inherit resolvePath filesetToSource;
 
   mkMesonDerivation =

src/libexpr-tests/compose-yaml-test-suite.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+
+testclass="FromYAMLTest"
+testmethod="execYAMLTest"
+
+if [ -z "$1" ]; then
+	echo "Usage: $0 PathToYamlTestSuiteRepository"
+	echo
+	echo "This script processes test cases from the yaml-test-suite repository (https://github.com/yaml/yaml-test-suite) and converts them into gtest tests for 'builtins.fromYAML'."
+	exit 1
+fi
+
+echo "/* Generated by $(basename "$0") */"
+echo
+echo "#pragma once"
+echo
+
+for f in "$1"/src/*.yaml; do
+	testname="$(basename "${f}" .yaml)"
+	echo "static constexpr std::string_view T_${testname} = R\"RAW("
+	cat "${f}"
+	case "${testname}" in
+		"4ABK")
+			cat << EOL
+  json: |
+    {
+      "unquoted": "separate",
+      "http://foo.com": null,
+      "omitted value": null
+    }
+EOL
+			;;
+#		"SM9W")
+#			echo "  # not JSON compatible due to null key"
+#			echo "  fail: true"
+#			;;
+#		"UKK6")
+#			echo "  # empty document"
+#			echo "  fail: true"
+#			;;
+		*)
+			;;
+	esac
+	echo ")RAW\";"
+	echo
+done
+
+echo "namespace {"
+echo "using namespace nix;"
+echo
+for f in "$1"/src/*.yaml; do
+	testname="$(basename "${f}" .yaml)"
+	ignore="false"
+	skip="false"
+	throw_comment=""
+	# shellcheck disable=SC2221,SC2222
+	case "${testname}" in
+		"H7TQ"|"MUS6"|"ZYU8")
+			echo "/** This test is ignored because these tests are not required to fail and rapidyaml ignores the YAML version string."
+			ignore="true"
+			;;
+		"3HFZ"|"4EJS"|"5TRB"|"5U3A"|"7LBH"|"9C9N"|"9MQT"|"CVW2"|"CXX2"|"D49Q"|"DK4H"|"DK95"|"G5U8"|"JKF3"|"N782"|"QB6E"|"QLJ7"|"RXY3"|"S4GJ"|"S98Z"|"SY6V"|"VJP3"|"X4QW"|"Y79Y"|"YJV2"|"ZCZ6"|"ZL4Z"|"ZXT5"|"3HFZ"|"4EJS"|"5TRB"|"5U3A"|"7LBH"|"9C9N"|"9MQT"|"CVW2"|"CXX2"|"D49Q"|"DK4H"|"DK95"|"G5U8"|"JKF3"|"N782"|"QB6E"|"QLJ7"|"RXY3"|"S4GJ"|"S98Z"|"SY6V"|"VJP3"|"X4QW"|"Y79Y"|"YJV2"|"ZCZ6"|"ZL4Z"|"ZXT5")
+			skip="true"
+			;;
+		"565N")
+			throw_comment="nix has no binary data type"
+			;;
+		"5TYM"|"6CK3"|"6WLZ"|"7FWL"|"9WXW"|"C4HZ"|"CC74"|"CUP7"|"M5C3"|"P76L"|"UGM3"|"Z67P"|"Z9M4")
+			throw_comment="usage of unknown tags"
+			;;
+		"2XXW"|"J7PZ")
+			throw_comment="usage of optional tag like !!set and !!omap (not implemented)"
+			;;
+	esac
+	echo "TEST_F(${testclass}, T_${testname})"
+	echo "{"
+	if [ -n "${throw_comment}" ]; then
+		echo "    EXPECT_THROW(${testmethod}(T_${testname}), EvalError) << \"${throw_comment}\";"
+	else
+		if [ "${skip}" = "true" ]; then
+			echo "    GTEST_SKIP() << \"Reason: Invalid yaml is parsed successfully\";"
+		fi
+		echo "    ${testmethod}(T_${testname});"
+	fi
+	echo "}"
+	[[ "${ignore}" = "true" ]] && echo "*/"
+	echo
+done
+echo "} /* namespace */"

src/libexpr-tests/meson.build

@@ -64,6 +64,7 @@ sources = files(
   'value/context.cc',
   'value/print.cc',
   'value/value.cc',
+  'yaml.cc'
 )
 
 include_dirs = [include_directories('.')]