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Added 0b1010 binary format. Fixed hex and octal to allow negative ints

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This commit is contained in:
Jonathan Turner
2009-12-11 14:46:12 +00:00
parent 0c0df2c982
commit e5a29ede5f
1 changed files with 54 additions and 3 deletions
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57
include/chaiscript/language/chaiscript_parser.hpp
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@@ -275,6 +275,38 @@ namespace chaiscript
return retval;
}
/**
* Reads a floating point value from input, without skipping initial whitespace
*/
bool Binary_() {
bool retval = false;
if ((input_pos != input_end) && (*input_pos == '0')) {
++input_pos;
++col;
if ((input_pos != input_end) && ((*input_pos == 'b') || (*input_pos == 'B'))) {
++input_pos;
++col;
if ((input_pos != input_end) && ((*input_pos >= '0') && (*input_pos <= '1'))) {
retval = true;
while ((input_pos != input_end) && ((*input_pos >= '0') && (*input_pos <= '1'))) {
++input_pos;
++col;
}
}
else {
--input_pos;
--col;
}
}
else {
--input_pos;
--col;
}
}
return retval;
}
/**
* Reads a number from the input, detecting if it's an integer or floating point
@@ -293,9 +325,28 @@ namespace chaiscript
if (Hex_()) {
std::string match(start, input_pos);
std::stringstream ss(match);
int temp_int;
unsigned int temp_int;
ss >> std::hex >> temp_int;
std::ostringstream out_int;
out_int << int(temp_int);
TokenPtr t(new Token(out_int.str(), Token_Type::Int, filename, prev_line, prev_col, line, col));
match_stack.push_back(t);
return true;
}
if (Binary_()) {
std::string match(start, input_pos);
int temp_int = 0;
unsigned int pos = 0, end = match.length();
while ((pos < end) && (pos < (2 + sizeof(int) * 8))) {
temp_int <<= 1;
if (match[pos] == '1') {
temp_int += 1;
}
++pos;
}
std::ostringstream out_int;
out_int << temp_int;
TokenPtr t(new Token(out_int.str(), Token_Type::Int, filename, prev_line, prev_col, line, col));
@@ -312,11 +363,11 @@ namespace chaiscript
std::string match(start, input_pos);
if ((match.size() > 0) && (match[0] == '0')) {
std::stringstream ss(match);
int temp_int;
unsigned int temp_int;
ss >> std::oct >> temp_int;
std::ostringstream out_int;
out_int << temp_int;
out_int << int(temp_int);
TokenPtr t(new Token(out_int.str(), Token_Type::Int, filename, prev_line, prev_col, line, col));
match_stack.push_back(t);
}