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AK: Allow exponents in JSON double values

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This is required for ECMA-404 compliance, but probably not for serenity
itself.
This commit is contained in:
davidot 2022-08-30 01:59:32 +02:00 committed by Linus Groh
parent 68c6161f25
commit 75ebcf6b4a
Notes: sideshowbarker 2024-07-17 07:34:45 +09:00 
Author: https://github.com/davidot
Commit: https://github.com/SerenityOS/serenity/commit/75ebcf6b4a
Pull-request: https://github.com/SerenityOS/serenity/pull/15100
Reviewed-by: https://github.com/linusg
2 changed files with 55 additions and 8 deletions
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54
AK/JsonParser.cpp
View file

@ -190,6 +190,7 @@ ErrorOr<JsonValue> JsonParser::parse_number()
JsonValue value;
Vector<char, 128> number_buffer;
Vector<char, 128> fraction_buffer;
Vector<char, 128> exponent_buffer;
bool is_double = false;
bool all_zero = true;
@ -231,6 +232,30 @@ ErrorOr<JsonValue> JsonParser::parse_number()
break;
}
#ifndef KERNEL
if (peek() == 'e' || peek() == 'E') {
// Force it to be a double
is_double = true;
++m_index;
for (;;) {
char ch = peek();
if (ch == '.')
return Error::from_string_literal("JsonParser: Error while parsing number");
if (ch == '-' || ch == '+' || (ch >= '0' && ch <= '9')) {
exponent_buffer.append(ch);
++m_index;
continue;
}
break;
}
if (exponent_buffer.is_empty())
return Error::from_string_literal("JsonParser: Error while parsing number");
}
#endif
StringView number_string(number_buffer.data(), number_buffer.size());
#ifndef KERNEL
@ -250,16 +275,29 @@ ErrorOr<JsonValue> JsonParser::parse_number()
return Error::from_string_literal("JsonParser: Error while parsing number");
whole = number.value();
}
double number_value = whole;
StringView fraction_string(fraction_buffer.data(), fraction_buffer.size());
auto fraction_string_uint = fraction_string.to_uint<u64>();
if (!fraction_string_uint.has_value())
return Error::from_string_literal("JsonParser: Error while parsing number");
auto fraction = static_cast<double>(fraction_string_uint.value());
double sign = (whole < 0) ? -1 : 1;
if (!fraction_buffer.is_empty()) {
StringView fraction_string(fraction_buffer.data(), fraction_buffer.size());
auto fraction_string_uint = fraction_string.to_uint<u64>();
if (!fraction_string_uint.has_value())
return Error::from_string_literal("JsonParser: Error while parsing number");
auto fraction = static_cast<double>(fraction_string_uint.value());
double sign = (whole < 0) ? -1 : 1;
auto divider = pow(10.0, static_cast<double>(fraction_buffer.size()));
number_value += sign * (fraction / divider);
}
auto divider = pow(10.0, static_cast<double>(fraction_buffer.size()));
value = JsonValue((double)whole + sign * (fraction / divider));
if (exponent_buffer.size() > 0) {
StringView exponent_string(exponent_buffer.data(), exponent_buffer.size());
auto exponent_string_uint = exponent_string.to_int();
if (!exponent_string_uint.has_value())
return Error::from_string_literal("JsonParser: Error while parsing number");
double exponent = pow(10.0, static_cast<double>(exponent_string_uint.value()));
number_value *= exponent;
}
value = JsonValue(number_value);
} else {
#endif
auto to_unsigned_result = number_string.to_uint<u64>();

9
Tests/AK/TestJSON.cpp
View file

@ -134,3 +134,12 @@ TEST_CASE(json_parse_long_decimals)
auto value = JsonValue::from_string("1644452550.6489999294281"sv);
EXPECT_EQ(value.value().as_double(), 1644452550.6489999294281);
}
TEST_CASE(json_parse_number_with_exponent)
{
auto value_without_fraction = JsonValue::from_string("10e5"sv);
EXPECT_EQ(value_without_fraction.value().as_double(), 1000000.0);
auto value_with_fraction = JsonValue::from_string("10.5e5"sv);
EXPECT_EQ(value_with_fraction.value().as_double(), 1050000.0);
}