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Add support for multiply calling lambda parsers in Clara

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Previously a lambda parser in Clara could only be invoked once,
even if it internally was ok with being invoked multiple times.

With this change, a lambda parser can mark itself as `accept_many`,
in which case it will be invoked multiple times if the appropriate
flag was supplied multiple times by the user.
This commit is contained in:
Martin Hořeňovský
2021-10-27 18:57:56 +02:00
parent f17725a186
commit 12d14a3c63
11 changed files with 292 additions and 20 deletions
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57
tests/SelfTest/IntrospectiveTests/Clara.tests.cpp
View File

@@ -4,19 +4,70 @@
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <catch2/catch_test_macros.hpp>
#include <catch2/internal/catch_clara.hpp>
#include <string>
TEST_CASE("is_unary_function", "[clara][compilation]") {
auto unary1 = [](int) {};
auto unary2 = [](std::string const&) {};
auto const unary3 = [](std::string const&) {};
auto unary4 = [](int) { return 42; };
void unary5(char);
double unary6(long);
double binary1(long, int);
auto binary2 = [](int, char) {};
auto nullary1 = []() {};
auto nullary2 = []() {return 42;};
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary1)>::value);
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary2)>::value);
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary3)>::value);
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary4)>::value);
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary5)>::value);
STATIC_REQUIRE(Catch::Clara::Detail::is_unary_function<decltype(unary6)>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(binary1)>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(binary2)>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(nullary1)>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<decltype(nullary2)>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<int>::value);
STATIC_REQUIRE_FALSE(Catch::Clara::Detail::is_unary_function<std::string const&>::value);
}
TEST_CASE("Clara::Arg supports single-arg parse the way Opt does", "[clara][arg][compilation]") {
std::string name;
auto p = Catch::Clara::Arg(name, "just one arg");
CHECK(name.empty());
p.parse( Catch::Clara::Args{ "UnitTest", "foo" } );
REQUIRE(name == "foo");
}
TEST_CASE("Clara::Opt supports accept-many lambdas", "[clara][opt]") {
std::string name;
using namespace Catch::Clara;
std::vector<std::string> res;
const auto push_to_res = [&](std::string const& s) {
res.push_back(s);
return ParserResult::ok();
};
SECTION("Parsing fails on multiple options without accept_many") {
auto p = Parser() | Opt(push_to_res, "value")["-o"];
auto parse_result = p.parse( Args{ "UnitTest", "-o", "aaa", "-o", "bbb" } );
CHECK_FALSE(parse_result);
}
SECTION("Parsing succeeds on multiple options with accept_many") {
auto p = Parser() | Opt(accept_many, push_to_res, "value")["-o"];
auto parse_result = p.parse( Args{ "UnitTest", "-o", "aaa", "-o", "bbb" } );
CHECK(parse_result);
CHECK(res == std::vector<std::string>{ "aaa", "bbb" });
}
}