roInt, roFloat, roString

• An object is needed instead of a typed value.  For example, roList maintains a list of objects.
• If any object exposes the ifInt, ifFloat, or ifString interfaces, that object can be used in any expression that expects a typed value. For example, an roTouchEvent can be used as an integer whose value is the userid of the roTouchEvent.

If "o" is of type roInt, then these statements will have the following effects:

• print o: Prints the value of o.GetInt()
• i%=o: Assigns the integer i% the value of o.GetInt().
• k=o: Presumably k is automatically typed, so it becomes another reference to the roInt  o.
• o=5: This is NOT the same as o.SetInt(5). Instead it releases o, changes the type of o to roINT32 (o is automatically typed), and assigns it to 5.

When a function that expects a BrightScript object as a parameter is passed an int, float, or string, BrightScript automatically creates the equivalent object.

ifInt

roInt contains the  ifInt interface, which provides the following:

GetInt() As Integer
 

SetInt(value As Integer) As Void

ifIntOps

roInt also contains the  ifIntOps interface, which provides the following:

ToStr() As String

Returns the integer value as a string. A space is not appended to the front for positive numbers.

ifFloat

roFloat contains the  ifFloat interface, which provides the following:

GetFloat() As Float

SetFloat(value As Float) As Void

ifString

roString contains the  ifString interface, which provides the following:

GetString() As String

SetString(value As String) As Void

ifStringOps

roString also contains the  ifStringOps interface, which provides the following:

SetString(str As String, str_len As Integer)

Sets a string using the specified string and string-length values. This is similar to the roString.SetString() method, which does not accept a parameter for string length.

AppendString(str As String, str_len As Integer)

Appends to a string using the specified string and string-length values. This method modifies itself—this can cause unexpected results when you pass an intrinsic string type, rather than a string object.

x="string"
x.ifstringops.appendstring("ddd",3)
print x 'will print 'string' 
y=box("string")
y.ifstringops.appendstring("ddd",3)
print y 'will print 'stringddd'

Len() As Integer

Returns the number of characters in a string.

GetEntityEncode() As String

Returns the string with certain characters replaced with HTML entity encoding sequences:

" (double quote)

"

' (single quote)

'

<

<

>

>

&

&

Tokenize(delim As String) As Object

Splits a string into substrings using the specified delimiter character(s). The delim parameter can contain one or more characters to treat as delimiters. If the string object contains multiple contiguous delimiters, they will be treated as a single delimiter. This method returns the substrings as an roList object; the delimiters are not returned with the substrings.

BrightScript> s = "one&&two"
BrightScript> print s.Tokenize("&")
one
two

Trim() As String

Returns the string with any leading and trailing whitespace characters (e.g. TAB, LF, CR, VT, FF, NO-BREAK SPACE) removed.

ToInt() As Integer

Returns the value of the string as an integer number.

ToFloat() As Float

Returns the value of the string as a floating point number.

Left(n As Integer) As String

Returns the first n characters of the string.

Right(n As Integer) As String

Returns the last n characters of the string.

Mid(start_index As Integer) As String

Returns a subset of the string that begins at the zero-based start_index and terminates at the end of the string.

Mid(start_index As Integer, n As Integer) As String

Returns a subset of the string, beginning at the zero-based start_index and consisting of n characters. If the string contains fewer than n characters after the specified start_index, this method will return all characters after the start_index.

Instr(substring As String) As Integer

Returns the zero-based index of the first occurence of the substring in the string. If the substring does not occur in the string, this method returns -1. 

Instr(start_index As Integer, substring As String) As Integer

Returns the zero-based index of the first occurence of the substring after the specified start_index in the string. If the substring does not occur after the specified start_index, this method returns -1.

BrightScript> o=CreateObject("roInt")
BrightScript> o.SetInt(555)
BrightScript> print o
555
BrightScript> print o.GetInt()
555
BrightScript> print o-55
500 

An integer value of 5 is converted to type roInt automatically because the AddTail() method expects a BrightScript object as its parameter:

BrightScript> list=CreateObject("roList")
BrightScript> list.AddTail(5)
BrightScript> print type(list.GetTail()) 

Here the ListDir() method returns an roList object containing roString objects:

BrightScript> l=ListDir("/")
BrightScript> for i=1 to l.Count():print l.RemoveHead():next
test_movie_3.vob
test_movie_4.vob
test_movie_1.vob
test_movie_2.vob