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LibJS: Add numeric literal parsing for different bases and exponents

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This commit is contained in:
Stephan Unverwerth 2020-04-05 14:20:58 +02:00 • committed by Andreas Kling
parent b82a2239c6
commit 500f6d9e3a
Notes: sideshowbarker 2024-07-19 07:53:33 +09:00
4 changed files with 107 additions and 5 deletions
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19
Libraries/LibJS/Token.cpp
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@ -27,6 +27,7 @@
#include "Token.h"
#include <AK/Assertions.h>
#include <AK/StringBuilder.h>
#include <ctype.h>
namespace JS {
@ -52,7 +53,23 @@ const char* Token::name() const
double Token::double_value() const
{
ASSERT(type() == TokenType::NumericLiteral);
return strtod(String(m_value).characters(), nullptr);
String value_string(m_value);
if (value_string[0] == '0' && value_string.length() >= 2) {
if (value_string[1] == 'x' || value_string[1] == 'X') {
// hexadecimal
return static_cast<double>(strtoul(value_string.characters() + 2, nullptr, 16));
} else if (value_string[1] == 'o' || value_string[1] == 'O') {
// octal
return static_cast<double>(strtoul(value_string.characters() + 2, nullptr, 8));
} else if (value_string[1] == 'b' || value_string[1] == 'B') {
// binary
return static_cast<double>(strtoul(value_string.characters() + 2, nullptr, 2));
} else if (isdigit(value_string[1])) {
// also octal, but syntax error in strict mode
return static_cast<double>(strtoul(value_string.characters() + 1, nullptr, 8));
}
}
return strtod(value_string.characters(), nullptr);
}
String Token::string_value() const