void GString::TrimRightWS()
{
while ((_len) && (isWS(_str[_len - 1])))
_len--;
_str[_len] = 0;
}
void GString::TrimLeftWS()
{
int i = 0;
while ((i < _len) && (isWS(_str[i])))
i++;
if (i != 0)
{
_len -= i;
memmove(_str, &_str[i], _len + 1);
}
}
bool CueTokenizer<CharT>::nextline()
{
m_fields.clear();
int_type c;
std::basic_string<CharT> field;
while (traits_type::not_eof(c = m_sb->sbumpc())) {
if (c == '"') {
// eat until closing quote
while (traits_type::not_eof(c = m_sb->sbumpc())) {
if (c == '\n')
throw std::runtime_error(format(
"Runaway string at line %d", m_lineno + 1));
else if (c != '"')
field.push_back(c);
else if (m_sb->sgetc() != '"') // closing quote
break;
else { // escaped quote
m_sb->snextc();
field.push_back(c);
}
}
}
else if (c == '\n') {
++m_lineno;
break;
}
else if (isWS(c)) {
if (field.size()) {
m_fields.push_back(field);
field.clear();
}
while (isWS(m_sb->sgetc()))
m_sb->snextc();
}
else
field.push_back(c);
}
if (field.size()) m_fields.push_back(field);
return field.size() > 0 || c == '\n';
}
//! Checks if there is whitespace in the range specified in the string
inline std::string findComment(const ExprNode& node) {
const Expression& expr = *node.expr();
typedef std::vector<std::pair<int, int> > Comments;
const Comments& comments = expr.getComments();
const std::string& s = expr.getExpr();
// TODO: user lower_bound to make this O(lg n) instead of O(n)
for (Comments::const_iterator i = comments.begin(); i != comments.end(); ++i) {
if (i->first >= node.endPos() && isWS(s.c_str(), node.endPos(), i->first))
return s.substr(i->first, i->second - i->first + 1);
}
return "";
}
bool Lexer::GetToken(Token&obj)
{
string strBuf;
int id;
DataValue dv;
while (!isEOF())
{
skipWS();
/////////////
// Check for chr/strlit
//
if (nextChar() == '-')
bool b=true;
if (nextChar() == '\'' || nextChar() == '\"')
{
char ch = getChar();
strBuf = "";
while (!isEOF())
{
if (nextChar() == '\r' || nextChar() == '\n')
{
dv.SetStrData("Newline in constant.");
throw Token(Token::LEX_ERROR,dv);
}
if (nextChar() == ch)
{
getChar();
if (ch == '\'')
{
if (strBuf.length() != 1)
{
dv.SetStrData("Character literals must have exactly one character.");
throw Token(Token::LEX_ERROR,dv);
}
dv.SetCharData(strBuf[0]);
obj=Token(Token::LEX_CHRLIT,dv);
return true;
}
else
{
dv.SetStrData(strBuf);
obj=Token(Token::LEX_STRLIT,dv);
return true;
}
}
strBuf += getChar();
}
dv.SetStrData("EOF in constant.");
throw Token(Token::LEX_ERROR,dv);
}
/////////////
// Check for Operators, then keywords
//
StorePosition();
id = dfaOperators.GetString(strBuf);
if (id == 0)
{
ResetPosition();
id = dfaKeywords.GetString(strBuf);
if (id == 0)
{
/////////////
// Check for numbers/idents
//
while (!isEOF() && !isWS(nextChar()) && !dfaOperators.ValidFirst(nextChar()))
{
strBuf += toLower(getChar());
}
//if it's all numbers
if (strBuf.find_first_not_of("0123456789",0,10) == string::npos)
{
//read in anything, including dots (will cover floats and invalid idents)
while (!isEOF() && !isWS(nextChar()) && (nextChar() == '.' || !dfaOperators.ValidFirst(nextChar())))
{
strBuf += toLower(getChar());
}
}
bool found = false;
if (strBuf.find_first_not_of("0123456789.",0,11) == string::npos)
{
string::size_type off;
off = strBuf.find('.',0);
if (off == string::npos)
{
dv.SetIntData(atoi(strBuf.c_str()));
obj=Token(Token::LEX_INTLIT,dv);
return true;
}
else
{
if (strBuf.find('.',off+1) == string::npos)
{
dv.SetFloatData(atof(strBuf.c_str()));
obj=Token(Token::LEX_FLOLIT,dv);
return true;
}
}
}
//validate identifier
try
{
if (strBuf.length() > 20)
throw 2;
for (string::iterator it = strBuf.begin();it != strBuf.end();++it)
{
if (it == strBuf.begin())
{
if (!isAlpha(*it))
{
throw 0;
}
}
if (!isAlpha(*it) && *it != '_' && !isNum(*it))
{
throw 1;
}
}
} catch(int iError)
{
switch (iError)
{
case 0:
dv.SetStrData("Unrecognized lexeme ("+strBuf+"): identifiers must begin with a letter.");
throw Token(Token::LEX_ERROR,dv);
case 1:
dv.SetStrData("Unrecognized lexeme ("+strBuf+"): identifiers can only contain underscores and alphanumeric characters.");
throw Token(Token::LEX_ERROR,dv);
case 2:
dv.SetStrData("Unrecognized lexeme ("+strBuf+"): identifiers can be at most 20 characters long.");
throw Token(Token::LEX_ERROR,dv);
}
}
dv.SetStrData(strBuf);
obj=Token(Token::LEX_IDENT,dv);
return true;
}
}
if (id)
{
dv.Clear();
obj=Token((Token::TokenType)id,dv);
return true;
}
dv.SetStrData("Undefined error.");
throw Token(Token::LEX_ERROR,dv);
}
//int 0 means eof
dv.SetStrData("EOF");
obj=Token(Token::LEX_ERROR,dv);
return false;
}
