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AK: Add parsing of JSON double values

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This patch adds the parsing of double values to the JSON parser.
There is another char buffer that get's filled when a "." is present
in the number parsing. When number finished, a divider is calculated
to transform the number behind the "." to the actual fraction value.
This commit is contained in:
Emanuel Sprung 2020-03-24 21:59:22 +01:00 committed by Andreas Kling
parent 45921328e4
commit bca5762542
Notes: sideshowbarker 2024-07-19 08:08:43 +09:00 
Author: https://github.com/lnzero1dev
Commit: https://github.com/SerenityOS/serenity/commit/bca57625429
Pull-request: https://github.com/SerenityOS/serenity/pull/1510
1 changed files with 36 additions and 5 deletions
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41
AK/JsonParser.cpp
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@ -191,10 +191,21 @@ JsonValue JsonParser::parse_string()
JsonValue JsonParser::parse_number()
{
Vector<char, 128> number_buffer;
Vector<char, 128> fraction_buffer;
bool is_double = false;
for (;;) {
char ch = peek();
if (ch == '.') {
is_double = true;
++m_index;
continue;
}
if (ch == '-' || (ch >= '0' && ch <= '9')) {
number_buffer.append(ch);
if (is_double)
fraction_buffer.append(ch);
else
number_buffer.append(ch);
++m_index;
continue;
}
@ -202,11 +213,31 @@ JsonValue JsonParser::parse_number()
}
StringView number_string(number_buffer.data(), number_buffer.size());
StringView fraction_string(fraction_buffer.data(), fraction_buffer.size());
bool ok;
auto value = JsonValue(number_string.to_uint(ok));
if (!ok)
value = JsonValue(number_string.to_int(ok));
ASSERT(ok);
JsonValue value;
if (is_double) {
int whole = number_string.to_uint(ok);
if (!ok)
whole = number_string.to_int(ok);
ASSERT(ok);
int fraction = fraction_string.to_uint(ok);
ASSERT(ok);
auto divider = 1;
for (size_t i = 0; i < fraction_buffer.size(); ++i) {
divider *= 10;
}
value = JsonValue((double)whole + ((double)fraction / divider));
} else {
value = JsonValue(number_string.to_uint(ok));
if (!ok)
value = JsonValue(number_string.to_int(ok));
ASSERT(ok);
}
return value;
}