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660 lines
18 KiB
C++
660 lines
18 KiB
C++
#include "scanner.hpp"
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#include <cassert>
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#include <sstream>
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#include "exception.hpp"
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#include "errorhandler.hpp"
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#include "parser.hpp"
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#include "extensions.hpp"
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#include <components/misc/strings/lower.hpp>
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namespace Compiler
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{
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bool Scanner::get (MultiChar& c)
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{
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if (!c.getFrom(mStream))
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return false;
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mPrevLoc = mLoc;
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if (c=='\n')
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{
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mStrictKeywords = false;
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mTolerantNames = false;
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mExpectName = false;
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mLoc.mColumn = 0;
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++mLoc.mLine;
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mLoc.mLiteral.clear();
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}
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else
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{
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++mLoc.mColumn;
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c.appendTo(mLoc.mLiteral);
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}
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return true;
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}
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void Scanner::putback (MultiChar& c)
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{
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c.putback(mStream);
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mLoc = mPrevLoc;
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}
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bool Scanner::scanToken (Parser& parser)
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{
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switch (mPutback)
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{
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case Putback_Special:
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mPutback = Putback_None;
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return parser.parseSpecial (mPutbackCode, mPutbackLoc, *this);
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case Putback_Integer:
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mPutback = Putback_None;
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return parser.parseInt (mPutbackInteger, mPutbackLoc, *this);
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case Putback_Float:
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mPutback = Putback_None;
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return parser.parseFloat (mPutbackFloat, mPutbackLoc, *this);
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case Putback_Name:
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mPutback = Putback_None;
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return parser.parseName (mPutbackName, mPutbackLoc, *this);
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case Putback_Keyword:
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mPutback = Putback_None;
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return parser.parseKeyword (mPutbackCode, mPutbackLoc, *this);
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case Putback_None:
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break;
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}
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MultiChar c;
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if (!get (c))
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{
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parser.parseEOF (*this);
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return false;
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}
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else if (c==';')
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{
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std::string comment;
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c.appendTo(comment);
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while (get (c))
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{
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if (c=='\n')
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{
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putback (c);
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break;
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}
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else
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c.appendTo(comment);
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}
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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return parser.parseComment (comment, loc, *this);
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}
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else if (c.isWhitespace())
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{
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mLoc.mLiteral.clear();
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return true;
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}
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else if (c==':')
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{
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// treat : as a whitespace :(
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mLoc.mLiteral.clear();
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return true;
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}
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else if (c.isAlpha() || c=='_' || c=='"')
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{
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bool cont = false;
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if (scanName (c, parser, cont))
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{
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mLoc.mLiteral.clear();
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return cont;
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}
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}
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else if (c.isDigit())
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{
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bool cont = false;
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bool scanned = mExpectName ? scanName(c, parser, cont) : scanInt(c, parser, cont);
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if (scanned)
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{
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mLoc.mLiteral.clear();
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return cont;
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}
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}
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else if (c==13) // linux compatibility hack
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{
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return true;
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}
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else
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{
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bool cont = false;
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if (scanSpecial (c, parser, cont))
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{
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mLoc.mLiteral.clear();
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return cont;
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}
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}
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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mErrorHandler.error ("Syntax error", loc);
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throw SourceException();
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}
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bool Scanner::scanInt (MultiChar& c, Parser& parser, bool& cont)
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{
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assert(c != '\0');
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std::string value;
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c.appendTo(value);
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while (get (c))
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{
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if (c.isDigit())
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{
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c.appendTo(value);
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}
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else if (!c.isMinusSign() && isStringCharacter (c))
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{
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/// workaround that allows names to begin with digits
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return scanName(c, parser, cont, value);
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}
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else if (c=='.')
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{
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return scanFloat (value, parser, cont);
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}
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else
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{
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putback (c);
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break;
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}
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}
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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std::istringstream stream (value);
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int intValue = 0;
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stream >> intValue;
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cont = parser.parseInt (intValue, loc, *this);
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return true;
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}
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bool Scanner::scanFloat (const std::string& intValue, Parser& parser, bool& cont)
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{
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std::string value = intValue + ".";
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MultiChar c;
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bool empty = intValue.empty() || intValue=="-";
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bool error = false;
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while (get (c))
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{
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if (c.isDigit())
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{
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c.appendTo(value);
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empty = false;
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}
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else if (c.isAlpha() || c=='_')
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error = true;
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else
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{
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putback (c);
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break;
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}
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}
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if (empty || error)
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return false;
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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std::istringstream stream (value);
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float floatValue = 0;
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stream >> floatValue;
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cont = parser.parseFloat (floatValue, loc, *this);
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return true;
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}
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static const char *sKeywords[] =
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{
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"begin", "end",
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"short", "long", "float",
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"if", "endif", "else", "elseif",
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"while", "endwhile",
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"return",
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"messagebox",
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"set", "to",
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nullptr,
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};
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bool Scanner::scanName (MultiChar& c, Parser& parser, bool& cont, std::string name)
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{
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c.appendTo(name);
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if (!scanName (name))
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return false;
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else if(name.empty())
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return true;
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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if (name.size()>=2 && name[0]=='"' && name[name.size()-1]=='"')
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{
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name = name.substr (1, name.size()-2);
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// allow keywords enclosed in ""
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/// \todo optionally disable
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if (mStrictKeywords)
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{
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cont = parser.parseName (name, loc, *this);
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return true;
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}
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}
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int i = 0;
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std::string lowerCase = Misc::StringUtils::lowerCase(name);
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bool isKeyword = false;
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for (; sKeywords[i]; ++i)
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if (lowerCase==sKeywords[i])
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{
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isKeyword = true;
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break;
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}
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// Russian localization and some mods use a quirk - add newline character directly
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// to compiled bytecode via HEX-editor to implement multiline messageboxes.
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// Of course, original editor can not compile such script.
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// Allow messageboxes to bypass the "incomplete string or name" error.
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if (lowerCase == "messagebox")
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enableIgnoreNewlines();
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else if (isKeyword)
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mIgnoreNewline = false;
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if (sKeywords[i])
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{
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cont = parser.parseKeyword (i, loc, *this);
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return true;
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}
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if (mExtensions)
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{
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if (int keyword = mExtensions->searchKeyword (lowerCase))
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{
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cont = parser.parseKeyword (keyword, loc, *this);
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return true;
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}
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}
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cont = parser.parseName (name, loc, *this);
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return true;
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}
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bool Scanner::scanName (std::string& name)
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{
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MultiChar c;
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bool error = false;
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while (get (c))
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{
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if (!name.empty() && name[0]=='"')
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{
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if (c=='"')
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{
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c.appendTo(name);
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break;
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}
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// ignoring escape sequences for now, because they are messing up stupid Windows path names.
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// else if (c=='\\')
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// {
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// if (!get (c))
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// {
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// error = true;
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// mErrorHandler.error ("incomplete escape sequence", mLoc);
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// break;
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// }
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// }
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else if (c=='\n')
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{
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if (mIgnoreNewline)
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mErrorHandler.warning ("string contains newline character, make sure that it is intended", mLoc);
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else
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{
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bool allWhitespace = true;
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for (size_t i = 1; i < name.size(); i++)
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{
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//ignore comments
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if (name[i] == ';')
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break;
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else if (name[i] != '\t' && name[i] != ' ' && name[i] != '\r')
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{
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allWhitespace = false;
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break;
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}
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}
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if (allWhitespace)
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{
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name.clear();
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mLoc.mLiteral.clear();
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mErrorHandler.warning ("unterminated empty string", mLoc);
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return true;
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}
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error = true;
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mErrorHandler.error ("incomplete string or name", mLoc);
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break;
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}
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}
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}
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else if (!(c=='"' && name.empty()))
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{
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if (!isStringCharacter (c) && !(mTolerantNames && (c=='.' || c == '-')))
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{
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putback (c);
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break;
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}
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}
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c.appendTo(name);
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}
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return !error;
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}
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bool Scanner::scanSpecial (MultiChar& c, Parser& parser, bool& cont)
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{
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bool expectName = mExpectName;
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mExpectName = false;
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int special = -1;
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if (c=='\n')
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special = S_newline;
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else if (c=='(' || c=='[') /// \todo option to disable the use of [ as alias for (
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special = S_open;
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else if (c==')' || c==']') /// \todo option to disable the use of ] as alias for )
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special = S_close;
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else if (c=='.')
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{
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MultiChar next;
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// check, if this starts a float literal
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if (get (next))
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{
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putback (next);
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if (next.isDigit())
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return scanFloat ("", parser, cont);
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}
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special = S_member;
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}
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else if (c=='=')
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{
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if (get (c))
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{
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/// \todo hack to allow a space in comparison operators (add option to disable)
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if (c==' ' && !get (c))
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special = S_cmpEQ;
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else if (c=='=')
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special = S_cmpEQ;
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else if (c == '>' || c == '<') // Treat => and =< as ==
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{
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special = S_cmpEQ;
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mErrorHandler.warning (std::string("invalid operator =") + c.data() + ", treating it as ==", mLoc);
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}
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else
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{
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special = S_cmpEQ;
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putback (c);
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// return false;
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/// Allow = as synonym for ==. \todo optionally disable for post-1.0 scripting improvements.
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}
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}
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else
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{
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putback (c);
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return false;
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}
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}
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else if (c=='!')
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{
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if (get (c))
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{
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/// \todo hack to allow a space in comparison operators (add option to disable)
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if (c==' ' && !get (c))
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return false;
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if (c=='=')
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special = S_cmpNE;
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else
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{
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putback (c);
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return false;
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}
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}
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else
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return false;
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}
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else if (c.isMinusSign())
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{
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MultiChar next;
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if (get (next))
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{
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if (next=='>')
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special = S_ref;
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else
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{
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putback (next);
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special = S_minus;
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}
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}
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else
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special = S_minus;
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}
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else if (c=='<')
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{
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if (get (c))
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{
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/// \todo hack to allow a space in comparison operators (add option to disable)
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if (c==' ' && !get (c))
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special = S_cmpLT;
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else if (c=='=')
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{
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special = S_cmpLE;
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if (get (c) && c!='=') // <== is a allowed as an alternative to <= :(
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putback (c);
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}
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else if (c == '<' || c == '>') // Treat <> and << as <
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{
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special = S_cmpLT;
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mErrorHandler.warning ("Invalid operator, treating it as <", mLoc);
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}
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else
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{
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putback (c);
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special = S_cmpLT;
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}
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}
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else
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special = S_cmpLT;
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}
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else if (c=='>')
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{
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if (get (c))
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{
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/// \todo hack to allow a space in comparison operators (add option to disable)
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if (c==' ' && !get (c))
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special = S_cmpGT;
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else if (c=='=')
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{
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special = S_cmpGE;
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if (get (c) && c!='=') // >== is a allowed as an alternative to >= :(
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putback (c);
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}
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else if (c == '<' || c == '>') // Treat >< and >> as >
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{
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special = S_cmpGT;
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mErrorHandler.warning ("Invalid operator, treating it as >", mLoc);
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}
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else
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{
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putback (c);
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special = S_cmpGT;
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}
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}
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else
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special = S_cmpGT;
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}
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else if (c=='+')
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special = S_plus;
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else if (c=='*')
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special = S_mult;
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else if (c=='/')
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special = S_div;
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else
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return false;
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if (special==S_newline)
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mLoc.mLiteral = "<newline>";
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else if (expectName && (special == S_member || special == S_minus))
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{
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bool tolerant = mTolerantNames;
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mTolerantNames = true;
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bool out = scanName(c, parser, cont);
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mTolerantNames = tolerant;
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return out;
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}
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TokenLoc loc (mLoc);
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mLoc.mLiteral.clear();
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cont = parser.parseSpecial (special, loc, *this);
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return true;
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}
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bool Scanner::isStringCharacter (MultiChar& c, bool lookAhead)
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{
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if (lookAhead && c.isMinusSign())
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{
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/// \todo disable this when doing more stricter compiling. Also, find out who is
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/// responsible for allowing it in the first place and meet up with that person in
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/// a dark alley.
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MultiChar next;
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if (next.peek(mStream) && isStringCharacter (next, false))
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return true;
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}
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return c.isAlpha() || c.isDigit() || c=='_' ||
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/// \todo disable this when doing more stricter compiling
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c=='`' || c=='\'';
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}
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// constructor
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Scanner::Scanner (ErrorHandler& errorHandler, std::istream& inputStream,
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const Extensions *extensions)
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: mErrorHandler (errorHandler), mStream (inputStream), mExtensions (extensions),
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mPutback (Putback_None), mPutbackCode(0), mPutbackInteger(0), mPutbackFloat(0),
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mStrictKeywords (false), mTolerantNames (false), mIgnoreNewline(false), mExpectName(false)
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{
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}
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void Scanner::scan (Parser& parser)
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{
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while (scanToken (parser));
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mExpectName = false;
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}
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void Scanner::putbackSpecial (int code, const TokenLoc& loc)
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{
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mPutback = Putback_Special;
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mPutbackCode = code;
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mPutbackLoc = loc;
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}
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void Scanner::putbackInt (int value, const TokenLoc& loc)
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{
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mPutback = Putback_Integer;
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mPutbackInteger = value;
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mPutbackLoc = loc;
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}
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void Scanner::putbackFloat (float value, const TokenLoc& loc)
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{
|
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mPutback = Putback_Float;
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mPutbackFloat = value;
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mPutbackLoc = loc;
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}
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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::sKeywords[i]; ++i)
|
|
keywords.emplace_back(Compiler::sKeywords[i]);
|
|
|
|
if (mExtensions)
|
|
mExtensions->listKeywords (keywords);
|
|
}
|
|
|
|
void Scanner::enableIgnoreNewlines()
|
|
{
|
|
mIgnoreNewline = true;
|
|
}
|
|
|
|
void Scanner::enableStrictKeywords()
|
|
{
|
|
mStrictKeywords = true;
|
|
}
|
|
|
|
void Scanner::enableTolerantNames()
|
|
{
|
|
mTolerantNames = true;
|
|
}
|
|
|
|
void Scanner::enableExpectName()
|
|
{
|
|
mExpectName = true;
|
|
}
|
|
}
|