You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
616 lines
15 KiB
C++
616 lines
15 KiB
C++
|
|
#include "scanner.hpp"
|
|
|
|
#include <cassert>
|
|
#include <cctype>
|
|
#include <sstream>
|
|
#include <algorithm>
|
|
#include <iterator>
|
|
|
|
#include "exception.hpp"
|
|
#include "errorhandler.hpp"
|
|
#include "parser.hpp"
|
|
#include "extensions.hpp"
|
|
|
|
#include <components/misc/stringops.hpp>
|
|
|
|
namespace Compiler
|
|
{
|
|
bool Scanner::get (char& c)
|
|
{
|
|
mStream.get (c);
|
|
|
|
if (!mStream.good())
|
|
return false;
|
|
|
|
mPrevLoc =mLoc;
|
|
|
|
if (c=='\n')
|
|
{
|
|
mLoc.mColumn = 0;
|
|
++mLoc.mLine;
|
|
mLoc.mLiteral.clear();
|
|
}
|
|
else
|
|
{
|
|
++mLoc.mColumn;
|
|
mLoc.mLiteral += c;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void Scanner::putback (char c)
|
|
{
|
|
mStream.putback (c);
|
|
mLoc = mPrevLoc;
|
|
}
|
|
|
|
bool Scanner::scanToken (Parser& parser)
|
|
{
|
|
bool allowDigit = mNameStartingWithDigit;
|
|
mNameStartingWithDigit = false;
|
|
|
|
switch (mPutback)
|
|
{
|
|
case Putback_Special:
|
|
|
|
mPutback = Putback_None;
|
|
return parser.parseSpecial (mPutbackCode, mPutbackLoc, *this);
|
|
|
|
case Putback_Integer:
|
|
|
|
mPutback = Putback_None;
|
|
return parser.parseInt (mPutbackInteger, mPutbackLoc, *this);
|
|
|
|
case Putback_Float:
|
|
|
|
mPutback = Putback_None;
|
|
return parser.parseFloat (mPutbackFloat, mPutbackLoc, *this);
|
|
|
|
case Putback_Name:
|
|
|
|
mPutback = Putback_None;
|
|
return parser.parseName (mPutbackName, mPutbackLoc, *this);
|
|
|
|
case Putback_Keyword:
|
|
|
|
mPutback = Putback_None;
|
|
return parser.parseKeyword (mPutbackCode, mPutbackLoc, *this);
|
|
|
|
case Putback_None:
|
|
|
|
break;
|
|
}
|
|
|
|
char c;
|
|
|
|
if (!get (c))
|
|
{
|
|
parser.parseEOF (*this);
|
|
return false;
|
|
}
|
|
else if (c==';')
|
|
{
|
|
std::string comment;
|
|
|
|
comment += c;
|
|
|
|
while (get (c))
|
|
{
|
|
if (c=='\n')
|
|
{
|
|
putback (c);
|
|
break;
|
|
}
|
|
else
|
|
comment += c;
|
|
}
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
return parser.parseComment (comment, loc, *this);
|
|
}
|
|
else if (isWhitespace (c))
|
|
{
|
|
mLoc.mLiteral.clear();
|
|
mNameStartingWithDigit = allowDigit;
|
|
return true;
|
|
}
|
|
else if (c==':')
|
|
{
|
|
// treat : as a whitespace :(
|
|
mLoc.mLiteral.clear();
|
|
return true;
|
|
}
|
|
else if (std::isalpha (c) || c=='_' || c=='"' || (allowDigit && std::isdigit (c)))
|
|
{
|
|
bool cont = false;
|
|
|
|
if (scanName (c, parser, cont))
|
|
{
|
|
mLoc.mLiteral.clear();
|
|
return cont;
|
|
}
|
|
}
|
|
else if (std::isdigit (c))
|
|
{
|
|
bool cont = false;
|
|
|
|
if (scanInt (c, parser, cont))
|
|
{
|
|
mLoc.mLiteral.clear();
|
|
return cont;
|
|
}
|
|
}
|
|
else if (c==13) // linux compatibility hack
|
|
{
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
bool cont = false;
|
|
|
|
if (scanSpecial (c, parser, cont))
|
|
{
|
|
mLoc.mLiteral.clear();
|
|
return cont;
|
|
}
|
|
}
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
mErrorHandler.error ("syntax error", loc);
|
|
throw SourceException();
|
|
}
|
|
|
|
bool Scanner::scanInt (char c, Parser& parser, bool& cont)
|
|
{
|
|
assert(c != '\0');
|
|
std::string value;
|
|
value += c;
|
|
|
|
bool error = false;
|
|
|
|
while (get (c))
|
|
{
|
|
if (std::isdigit (c))
|
|
{
|
|
value += c;
|
|
}
|
|
else if (std::isalpha (c) || c=='_')
|
|
error = true;
|
|
else if (c=='.' && !error)
|
|
{
|
|
return scanFloat (value, parser, cont);
|
|
}
|
|
else
|
|
{
|
|
putback (c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error)
|
|
return false;
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
std::istringstream stream (value);
|
|
|
|
int intValue = 0;
|
|
stream >> intValue;
|
|
|
|
cont = parser.parseInt (intValue, loc, *this);
|
|
return true;
|
|
}
|
|
|
|
bool Scanner::scanFloat (const std::string& intValue, Parser& parser, bool& cont)
|
|
{
|
|
std::string value = intValue + ".";
|
|
|
|
char c;
|
|
|
|
bool empty = intValue.empty() || intValue=="-";
|
|
bool error = false;
|
|
|
|
while (get (c))
|
|
{
|
|
if (std::isdigit (c))
|
|
{
|
|
value += c;
|
|
empty = false;
|
|
}
|
|
else if (std::isalpha (c) || c=='_')
|
|
error = true;
|
|
else
|
|
{
|
|
putback (c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (empty || error)
|
|
return false;
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
std::istringstream stream (value);
|
|
|
|
float floatValue = 0;
|
|
stream >> floatValue;
|
|
|
|
cont = parser.parseFloat (floatValue, loc, *this);
|
|
return true;
|
|
}
|
|
|
|
static const char *keywords[] =
|
|
{
|
|
"begin", "end",
|
|
"short", "long", "float",
|
|
"if", "endif", "else", "elseif",
|
|
"while", "endwhile",
|
|
"return",
|
|
"messagebox",
|
|
"set", "to",
|
|
"getsquareroot",
|
|
"menumode",
|
|
"random",
|
|
"startscript", "stopscript", "scriptrunning",
|
|
"getdistance",
|
|
"getsecondspassed",
|
|
"enable", "disable", "getdisabled",
|
|
0
|
|
};
|
|
|
|
bool Scanner::scanName (char c, Parser& parser, bool& cont)
|
|
{
|
|
std::string name;
|
|
name += c;
|
|
|
|
if (!scanName (name))
|
|
return false;
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
if (name.size()>=2 && name[0]=='"' && name[name.size()-1]=='"')
|
|
{
|
|
name = name.substr (1, name.size()-2);
|
|
cont = parser.parseName (name, loc, *this);
|
|
return true;
|
|
}
|
|
|
|
int i = 0;
|
|
|
|
std::string lowerCase = Misc::StringUtils::lowerCase(name);
|
|
|
|
for (; keywords[i]; ++i)
|
|
if (lowerCase==keywords[i])
|
|
break;
|
|
|
|
if (keywords[i])
|
|
{
|
|
cont = parser.parseKeyword (i, loc, *this);
|
|
return true;
|
|
}
|
|
|
|
if (mExtensions)
|
|
{
|
|
if (int keyword = mExtensions->searchKeyword (lowerCase))
|
|
{
|
|
cont = parser.parseKeyword (keyword, loc, *this);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
cont = parser.parseName (name, loc, *this);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Scanner::scanName (std::string& name)
|
|
{
|
|
char c;
|
|
bool error = false;
|
|
|
|
while (get (c))
|
|
{
|
|
if (!name.empty() && name[0]=='"')
|
|
{
|
|
if (c=='"')
|
|
{
|
|
name += c;
|
|
break;
|
|
}
|
|
// ignoring escape sequences for now, because they are messing up stupid Windows path names.
|
|
// else if (c=='\\')
|
|
// {
|
|
// if (!get (c))
|
|
// {
|
|
// error = true;
|
|
// mErrorHandler.error ("incomplete escape sequence", mLoc);
|
|
// break;
|
|
// }
|
|
// }
|
|
else if (c=='\n')
|
|
{
|
|
error = true;
|
|
mErrorHandler.error ("incomplete string or name", mLoc);
|
|
break;
|
|
}
|
|
}
|
|
else if (!(c=='"' && name.empty()))
|
|
{
|
|
if (!isStringCharacter (c))
|
|
{
|
|
putback (c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
name += c;
|
|
}
|
|
|
|
return !error;
|
|
}
|
|
|
|
bool Scanner::scanSpecial (char c, Parser& parser, bool& cont)
|
|
{
|
|
int special = -1;
|
|
|
|
if (c=='\n')
|
|
special = S_newline;
|
|
else if (c=='(' || c=='[') /// \todo option to disable the use of [ as alias for (
|
|
special = S_open;
|
|
else if (c==')' || c==']') /// \todo option to disable the use of ] as alias for )
|
|
special = S_close;
|
|
else if (c=='.')
|
|
{
|
|
// check, if this starts a float literal
|
|
if (get (c))
|
|
{
|
|
putback (c);
|
|
|
|
if (std::isdigit (c))
|
|
return scanFloat ("", parser, cont);
|
|
}
|
|
|
|
special = S_member;
|
|
}
|
|
else if (c=='=')
|
|
{
|
|
if (get (c))
|
|
{
|
|
/// \todo hack to allow a space in comparison operators (add option to disable)
|
|
if (c==' ' && !get (c))
|
|
special = S_cmpEQ;
|
|
else if (c=='=')
|
|
special = S_cmpEQ;
|
|
else
|
|
{
|
|
special = S_cmpEQ;
|
|
putback (c);
|
|
// return false;
|
|
/// Allow = as synonym for ==. \todo optionally disable for post-1.0 scripting improvements.
|
|
}
|
|
}
|
|
else
|
|
{
|
|
putback (c);
|
|
return false;
|
|
}
|
|
}
|
|
else if (c=='!')
|
|
{
|
|
if (get (c))
|
|
{
|
|
/// \todo hack to allow a space in comparison operators (add option to disable)
|
|
if (c==' ' && !get (c))
|
|
return false;
|
|
|
|
if (c=='=')
|
|
special = S_cmpNE;
|
|
else
|
|
{
|
|
putback (c);
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
else if (c=='-')
|
|
{
|
|
if (get (c))
|
|
{
|
|
if (c=='>')
|
|
special = S_ref;
|
|
else
|
|
{
|
|
putback (c);
|
|
special = S_minus;
|
|
}
|
|
}
|
|
else
|
|
special = S_minus;
|
|
}
|
|
else if (static_cast<unsigned char> (c)==0xe2)
|
|
{
|
|
/// Workaround for some translator who apparently can't keep his minus in order
|
|
/// \todo disable for later script formats
|
|
if (get (c) && static_cast<unsigned char> (c)==0x80 &&
|
|
get (c) && static_cast<unsigned char> (c)==0x93)
|
|
{
|
|
if (get (c))
|
|
{
|
|
if (c=='>')
|
|
special = S_ref;
|
|
else
|
|
{
|
|
putback (c);
|
|
special = S_minus;
|
|
}
|
|
}
|
|
else
|
|
special = S_minus;
|
|
}
|
|
else
|
|
{
|
|
mErrorHandler.error ("Invalid character", mLoc);
|
|
return false;
|
|
}
|
|
}
|
|
else if (c=='<')
|
|
{
|
|
if (get (c))
|
|
{
|
|
/// \todo hack to allow a space in comparison operators (add option to disable)
|
|
if (c==' ' && !get (c))
|
|
special = S_cmpLT;
|
|
else if (c=='=')
|
|
{
|
|
special = S_cmpLE;
|
|
|
|
if (get (c) && c!='=') // <== is a allowed as an alternative to <= :(
|
|
putback (c);
|
|
}
|
|
else
|
|
{
|
|
putback (c);
|
|
special = S_cmpLT;
|
|
}
|
|
}
|
|
else
|
|
special = S_cmpLT;
|
|
}
|
|
else if (c=='>')
|
|
{
|
|
if (get (c))
|
|
{
|
|
/// \todo hack to allow a space in comparison operators (add option to disable)
|
|
if (c==' ' && !get (c))
|
|
special = S_cmpGT;
|
|
else if (c=='=')
|
|
{
|
|
special = S_cmpGE;
|
|
|
|
if (get (c) && c!='=') // >== is a allowed as an alternative to >= :(
|
|
putback (c);
|
|
}
|
|
else
|
|
{
|
|
putback (c);
|
|
special = S_cmpGT;
|
|
}
|
|
}
|
|
else
|
|
special = S_cmpGT;
|
|
}
|
|
else if (c==',')
|
|
special = S_comma;
|
|
else if (c=='+')
|
|
special = S_plus;
|
|
else if (c=='*')
|
|
special = S_mult;
|
|
else if (c=='/')
|
|
special = S_div;
|
|
else
|
|
return false;
|
|
|
|
if (special==S_newline)
|
|
mLoc.mLiteral = "<newline>";
|
|
|
|
TokenLoc loc (mLoc);
|
|
mLoc.mLiteral.clear();
|
|
|
|
cont = parser.parseSpecial (special, loc, *this);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Scanner::isStringCharacter (char c, bool lookAhead)
|
|
{
|
|
return std::isalpha (c) || std::isdigit (c) || c=='_' ||
|
|
/// \todo disable this when doing more stricter compiling
|
|
c=='`' || c=='\'' ||
|
|
/// \todo disable this when doing more stricter compiling. Also, find out who is
|
|
/// responsible for allowing it in the first place and meet up with that person in
|
|
/// a dark alley.
|
|
(c=='-' && (!lookAhead || isStringCharacter (mStream.peek(), false)));
|
|
}
|
|
|
|
bool Scanner::isWhitespace (char c)
|
|
{
|
|
return c==' ' || c=='\t';
|
|
}
|
|
|
|
// constructor
|
|
|
|
Scanner::Scanner (ErrorHandler& errorHandler, std::istream& inputStream,
|
|
const Extensions *extensions)
|
|
: mErrorHandler (errorHandler), mStream (inputStream), mExtensions (extensions),
|
|
mPutback (Putback_None), mPutbackCode(0), mPutbackInteger(0), mPutbackFloat(0),
|
|
mNameStartingWithDigit (false)
|
|
{
|
|
}
|
|
|
|
void Scanner::scan (Parser& parser)
|
|
{
|
|
while (scanToken (parser));
|
|
}
|
|
|
|
void Scanner::putbackSpecial (int code, const TokenLoc& loc)
|
|
{
|
|
mPutback = Putback_Special;
|
|
mPutbackCode = code;
|
|
mPutbackLoc = loc;
|
|
}
|
|
|
|
void Scanner::putbackInt (int value, const TokenLoc& loc)
|
|
{
|
|
mPutback = Putback_Integer;
|
|
mPutbackInteger = value;
|
|
mPutbackLoc = loc;
|
|
}
|
|
|
|
void Scanner::putbackFloat (float value, const TokenLoc& loc)
|
|
{
|
|
mPutback = Putback_Float;
|
|
mPutbackFloat = value;
|
|
mPutbackLoc = loc;
|
|
}
|
|
|
|
void Scanner::putbackName (const std::string& name, const TokenLoc& loc)
|
|
{
|
|
mPutback = Putback_Name;
|
|
mPutbackName = name;
|
|
mPutbackLoc = loc;
|
|
}
|
|
|
|
void Scanner::putbackKeyword (int keyword, const TokenLoc& loc)
|
|
{
|
|
mPutback = Putback_Keyword;
|
|
mPutbackCode = keyword;
|
|
mPutbackLoc = loc;
|
|
}
|
|
|
|
void Scanner::listKeywords (std::vector<std::string>& keywords)
|
|
{
|
|
for (int i=0; Compiler::keywords[i]; ++i)
|
|
keywords.push_back (Compiler::keywords[i]);
|
|
|
|
if (mExtensions)
|
|
mExtensions->listKeywords (keywords);
|
|
}
|
|
|
|
void Scanner::allowNameStartingwithDigit()
|
|
{
|
|
mNameStartingWithDigit = true;
|
|
}
|
|
}
|