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✨ implemented exception-free parser #458 #582

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You can now pass a boolean "allow_exceptions" to the parse functions. If it is false, no exceptions are thrown in case of a parse error. Instead, parsing is stopped at the first error and a JSON value of type "discarded" (check with is_discarded()) is returned.
This commit is contained in:
Niels Lohmann 2017-07-27 20:33:11 +02:00
parent 669ebf51bc
commit 7d51214045
No known key found for this signature in database
GPG key ID: 7F3CEA63AE251B69
3 changed files with 170 additions and 23 deletions
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25
test/src/unit-class_parser.cpp
View file

@ -41,12 +41,31 @@ json parser_helper(const std::string& s)
{
json j;
json::parser(nlohmann::detail::input_adapter(s)).parse(true, j);
// if this line was reached, no exception ocurred
// -> check if result is the same without exceptions
json j_nothrow;
CHECK_NOTHROW(json::parser(nlohmann::detail::input_adapter(s), nullptr, false).parse(true, j_nothrow));
CHECK(j_nothrow == j);
return j;
}
bool accept_helper(const std::string& s)
{
return json::parser(nlohmann::detail::input_adapter(s)).accept(true);
// 1. parse s without exceptions
json j;
CHECK_NOTHROW(json::parser(nlohmann::detail::input_adapter(s), nullptr, false).parse(true, j));
const bool ok_noexcept = not j.is_discarded();
// 2. accept s
const bool ok_accept = json::parser(nlohmann::detail::input_adapter(s)).accept(true);
// 3. check if both approaches come to the same result
CHECK(ok_noexcept == ok_accept);
// 4. return result
return ok_accept;
}
TEST_CASE("parser class")
@ -590,8 +609,8 @@ TEST_CASE("parser class")
SECTION("overflow")
{
// overflows during parsing yield an exception, but is accepted anyway
CHECK(accept_helper("1.18973e+4932"));
// overflows during parsing
CHECK(not accept_helper("1.18973e+4932"));
}
SECTION("invalid numbers")

75
test/src/unit-deserialization.cpp
View file

@ -91,14 +91,19 @@ TEST_CASE("deserialization")
{
SECTION("stream")
{
std::stringstream ss1, ss2, ss3;
std::stringstream ss1, ss2, ss3, ss4;
ss1 << "[\"foo\",1,2,3,false,{\"one\":1}";
ss2 << "[\"foo\",1,2,3,false,{\"one\":1}";
ss3 << "[\"foo\",1,2,3,false,{\"one\":1}";
ss4 << "[\"foo\",1,2,3,false,{\"one\":1}";
CHECK_THROWS_AS(json::parse(ss1), json::parse_error&);
CHECK_THROWS_WITH(json::parse(ss2),
"[json.exception.parse_error.101] parse error at 29: syntax error - unexpected end of input; expected ']'");
CHECK(not json::accept(ss3));
json j_error;
CHECK_NOTHROW(j_error = json::parse(ss1, nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("string")
@ -108,6 +113,10 @@ TEST_CASE("deserialization")
CHECK_THROWS_WITH(json::parse(s),
"[json.exception.parse_error.101] parse error at 29: syntax error - unexpected end of input; expected ']'");
CHECK(not json::accept(s));
json j_error;
CHECK_NOTHROW(j_error = json::parse(s, nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("operator<<")
@ -260,6 +269,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 'a', 'a', 'a', 'a', 'a', 'a', '\\', 'u'};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 2")
@ -267,6 +280,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 'a', 'a', 'a', 'a', 'a', 'a', '\\', 'u', '1'};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 3")
@ -274,6 +291,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 'a', 'a', 'a', 'a', 'a', 'a', '\\', 'u', '1', '1', '1', '1', '1', '1', '1', '1'};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 4")
@ -281,6 +302,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 'a', 'a', 'a', 'a', 'a', 'a', 'u', '1', '1', '1', '1', '1', '1', '1', '1', '\\'};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 5")
@ -288,6 +313,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xC1};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 6")
@ -295,6 +324,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xDF, 0x7F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 7")
@ -302,6 +335,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xDF, 0xC0};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 8")
@ -309,6 +346,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xE0, 0x9F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 9")
@ -316,6 +357,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xEF, 0xC0};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 10")
@ -323,6 +368,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xED, 0x7F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 11")
@ -330,6 +379,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xF0, 0x8F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 12")
@ -337,6 +390,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xF0, 0xC0};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 13")
@ -344,6 +401,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xF3, 0x7F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 14")
@ -351,6 +412,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xF3, 0xC0};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 15")
@ -358,6 +423,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'\"', 0x7F, 0xF4, 0x7F};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
SECTION("case 16")
@ -365,6 +434,10 @@ TEST_CASE("deserialization")
uint8_t v[] = {'{', '\"', '\"', ':', '1', '1'};
CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error&);
CHECK(not json::accept(std::begin(v), std::end(v)));
json j_error;
CHECK_NOTHROW(j_error = json::parse(std::begin(v), std::end(v), nullptr, false));
CHECK(j_error.is_discarded());
}
}
}