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/* $Id$
* vim:tabstop=8:shiftwidth=8:filetype=cpp:textwidth=72:
*
* ParserDriver: glue class to driver between scanner and parser.
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
namespace yy {
template <typename T>
T
ParserDriver::makeBase10(std::string number)
{
std::string exponent = "";
unsigned long i = 0;
/* remove all underscores */
i = number.find('_', 0);
while (i != std::string::npos) {
number.erase(i, 1);
i = number.find('_', 0);
}
/* check for exponent */
i = number.find_first_of("eE", 0);
if (i != std::string::npos) {
exponent = number.substr(i);
/* remove exponent from number */
number = number.substr(0, i);
}
return ParserDriver::makeNumberFromParts<T>(number, exponent, 10);
}
template <typename T>
T
ParserDriver::makeBased(std::string number)
/* throw(std::invalid_argument) */
{
std::string exponent = "";
T num;
unsigned long j = 0;
char base = 10;
/* remove all underscores */
j = number.find('_', 0);
while (j != std::string::npos) {
number.erase(j, 1);
j = number.find('_', 0);
}
/* base specifier present? */
j = number.find('#', 0);
if (j != std::string::npos) {
std::string baseS = number.substr(0, j);
base = static_cast<char>(ParserDriver::makeLong(baseS, 10));
/* remove basespecifier + '#' */
number = number.substr(j + 1);
j = number.find('#', 0);
exponent = number.substr(j + 1);
/* remove exponent */
number.erase(j);
} else {
throw std::invalid_argument("Number w.o. base specifier: "
+ number);
}
num = ParserDriver::makeNumberFromParts<T>(number, exponent, base);
return num;
}
template <typename T>
T
ParserDriver::makeNumberFromParts(std::string& val,
std::string& exponent,
unsigned char base)
{
unsigned long i;
long exp = 0;
T result;
/* 1. convert exponent */
/* leading E? -> remove it. */
if (exponent[0] == 'E' || exponent[0] == 'e') {
exponent = exponent.substr(1);
}
exp = ParserDriver::makeLong(exponent, 10);
/* 2. check for decimal point in val */
i = val.find('.');
if (i != std::string::npos) {
/* remove . */
val.erase(i, 1);
/* shift exponent by number of digits after . */
exp -= val.length() - i;
}
/* convert number */
result = static_cast<T>(ParserDriver::makeLong(val, base));
/* 3. adjust by exponent */
/* FIXME sistpoty: range check! */
while (0 < exp) {
result *= base;
exp--;
}
while (exp < 0) {
result /= base;
exp++;
}
return result;
}
template <typename T>
void
ParserDriver::registerSymbolDecls(
const T *symbols,
enum ast::symType type
)
{
if (symbols == NULL) {
return;
}
for (typename T::const_iterator i =
symbols->begin(); i != symbols->end(); i++) {
this->symbolTable.registerSymbol(type, **i);
}
}
}; /* namespace yy */
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