private function readNumber($line, $col, Token $prev)
    {
        $value         = '';
        $start         = $this->position;
        [$char, $code] = $this->readChar();

        $isFloat = false;

        if ($code === 45) { // -
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();
        }

        // guard against leading zero's
        if ($code === 48) { // 0
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();

            if ($code >= 48 && $code <= 57) {
                throw new SyntaxError(
                    $this->source,
                    $this->position,
                    'Invalid number, unexpected digit after 0: ' . Utils::printCharCode($code)
                );
            }
        } else {
            $value        .= $this->readDigits();
            [$char, $code] = $this->readChar();
        }

        if ($code === 46) { // .
            $isFloat = true;
            $this->moveStringCursor(1, 1);

            $value        .= $char;
            $value        .= $this->readDigits();
            [$char, $code] = $this->readChar();
        }

        if ($code === 69 || $code === 101) { // E e
            $isFloat       = true;
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();

            if ($code === 43 || $code === 45) { // + -
                $value .= $char;
                $this->moveStringCursor(1, 1);
            }
            $value .= $this->readDigits();
        }

        return new Token(
            $isFloat ? Token::FLOAT : Token::INT,
            $start,
            $this->position,
            $line,
            $col,
            $prev,
            $value
        );
    }
private function readNumber($line, $col, Token $prev)
    {
        $value         = '';
        $start         = $this->position;
        [$char, $code] = $this->readChar();

        $isFloat = false;

        if ($code === 45) { // -
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();
        }

        // guard against leading zero's
        if ($code === 48) { // 0
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();

            if ($code >= 48 && $code <= 57) {
                throw new SyntaxError(
                    $this->source,
                    $this->position,
                    'Invalid number, unexpected digit after 0: ' . Utils::printCharCode($code)
                );
            }
        } else {
            $value        .= $this->readDigits();
            [$char, $code] = $this->readChar();
        }

        if ($code === 46) { // .
            $isFloat = true;
            $this->moveStringCursor(1, 1);

            $value        .= $char;
            $value        .= $this->readDigits();
            [$char, $code] = $this->readChar();
        }

        if ($code === 69 || $code === 101) { // E e
            $isFloat       = true;
            $value        .= $char;
            [$char, $code] = $this->moveStringCursor(1, 1)->readChar();

            if ($code === 43 || $code === 45) { // + -
                $value .= $char;
                $this->moveStringCursor(1, 1);
            }
            $value .= $this->readDigits();
        }

        return new Token(
            $isFloat ? Token::FLOAT : Token::INT,
            $start,
            $this->position,
            $line,
            $col,
            $prev,
            $value
        );
    }
private function readNumber ( $ line , $ col , Token $ prev ) { $ value = '' ; $ start = $ this -> position ; [ $ char , $ code ] = $ this -> readChar ( ) ; $ isFloat = false ; if ( $ code === 45 ) { // - $ value .= $ char ; [ $ char , $ code ] = $ this -> moveStringCursor ( 1 , 1 ) -> readChar ( ) ; } // guard against leading zero's if ( $ code === 48 ) { // 0 $ value .= $ char ; [ $ char , $ code ] = $ this -> moveStringCursor ( 1 , 1 ) -> readChar ( ) ; if ( $ code >= 48 && $ code <= 57 ) { throw new SyntaxError ( $ this -> source , $ this -> position , 'Invalid number, unexpected digit after 0: ' . Utils :: printCharCode ( $ code ) ) ; } } else { $ value .= $ this -> readDigits ( ) ; [ $ char , $ code ] = $ this -> readChar ( ) ; } if ( $ code === 46 ) { // . $ isFloat = true ; $ this -> moveStringCursor ( 1 , 1 ) ; $ value .= $ char ; $ value .= $ this -> readDigits ( ) ; [ $ char , $ code ] = $ this -> readChar ( ) ; } if ( $ code === 69 || $ code === 101 ) { // E e $ isFloat = true ; $ value .= $ char ; [ $ char , $ code ] = $ this -> moveStringCursor ( 1 , 1 ) -> readChar ( ) ; if ( $ code === 43 || $ code === 45 ) { // + - $ value .= $ char ; $ this -> moveStringCursor ( 1 , 1 ) ; } $ value .= $ this -> readDigits ( ) ; } return new Token ( $ isFloat ? Token :: FLOAT : Token :: INT , $ start , $ this -> position , $ line , $ col , $ prev , $ value ) ; }
Reads a number token from the source file, either a float
or an int depending on whether a decimal point appears.

Int:   -?(0|[1-9][0-9]*)
Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)?

@param int $line
@param int $col

@return Token

@throws SyntaxError
Reads a number token from the source file either a float or an int depending on whether a decimal point appears .