bool RequestQueue::PeekNextPiece(bt_index_t *pidx, bt_offset_t *poff,
bt_length_t *plen) const
{
const PIECE *piece;
if( !m_peek ) return PeekNext(pidx, poff, plen);
if( !(piece = FindPiece(m_peek->index)) ) return false;
piece = piece->next;
m_peek = piece ? piece->slices : (SLICE *)0;
if( m_peek ){
if( pidx ) *pidx = m_peek->index;
if( poff ) *poff = m_peek->offset;
if( plen ) *plen = m_peek->length;
}
return m_peek ? true : false;
}
int UDFParser::GetTok() {
// Skip any whitespace.
while (isspace(last_char_)) {
last_char_ = GetNextChar();
}
if (isalpha(last_char_)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
identifier_str_ = last_char_;
while (isalnum((last_char_ = GetNextChar()))) {
identifier_str_ += last_char_;
}
if (identifier_str_ == "BEGIN" || identifier_str_ == "begin") {
return tok_begin;
} else if (identifier_str_ == "IF" || identifier_str_ == "if") {
return tok_if;
} else if (identifier_str_ == "THEN" || identifier_str_ == "then") {
return tok_then;
} else if (identifier_str_ == "ELSE" || identifier_str_ == "else") {
return tok_else;
} else if (identifier_str_ == "END" || identifier_str_ == "end") {
return tok_end;
} else if (identifier_str_ == "RETURN" || identifier_str_ == "return") {
return tok_return;
}
return tok_identifier;
}
/*
TODO(PP): Do better error-handling for digits
*/
if (isdigit(last_char_) || last_char_ == '.') { // Number: [0-9.]+
std::string num_str;
do {
num_str += last_char_;
last_char_ = GetNextChar();
} while (isdigit(last_char_) || last_char_ == '.');
num_val_ = strtod(num_str.c_str(), nullptr);
return tok_number;
}
// Semicolon
if (last_char_ == ';') {
last_char_ = GetNextChar();
return tok_semicolon;
}
if (last_char_ == ',') {
last_char_ = GetNextChar();
return tok_comma;
}
// Handles single line comments
// (May not enter, since everything is flattened into one line)
if (last_char_ == '-') {
int nextChar = PeekNext();
if (nextChar == '-') {
last_char_ = GetNextChar();
// Comment until end of line.
do {
last_char_ = GetNextChar();
} while (last_char_ != EOF && last_char_ != '\n' && last_char_ != '\r');
if (last_char_ != EOF) {
return GetTok();
}
}
}
// Check for end of file. Don't eat the EOF.
if (last_char_ == EOF) {
return tok_eof;
}
// Otherwise, just return the character as its ascii value.
int this_char = last_char_;
last_char_ = GetNextChar();
return this_char;
}
