Token_Readers

Light-weight token input file readers.

		type Token_Reader
	Light-weight token input file reader. Behaviour. Temporary data.

		type Token_Reader_Access
	Type for instance variables.

Internal initialization and finalization

		procedure Initialize_Token_Reader
	Initialize a newly created reader instance.
	Param  Type  Description access This  Token_Reader'Class

		procedure Initialize_Token_Reader
	Initialize a newly created reader instance with a file to read.
	Param  Type  Description access This  Token_Reader'Class  in Filename  String  Open this file for reading.

		procedure Finalize_Token_Reader
	Close the input file.
	Param  Type  Description access This  Token_Reader'Class  Object instance.

Creating readers

		function Current_Input
	Create an Token reader for current input (stdin).
	Param  Type  Description return  Token_Reader_Access  The newly created token reader instance.

		function Open
	Create an Token reader for file input.
	Param  Type  Description in Filename  String  Open this file. return  Token_Reader_Access  The newly created token reader instance.

		procedure Close
	Close an Token reader's input file.
	Param  Type  Description in out This  Token_Reader_Access  Close this token reader.

Whitespace

		function Found_Whitespace
	Check if the next input character is whitespace.
	Param  Type  Description access This  Token_Reader'Class  return  Boolean  Whitespace at look-ahead?

		procedure Skip_Whitespace
	Skip forward until the next input character is not whitespace.
	Param  Type  Description access This  Token_Reader'Class

Reading tokens

		function Read_Word
	Read characters from input until one of the Word_Separators is found.
	Param  Type  Description access This  Token_Reader'Class  return  String  The word that was read.

		function Read_Real
	Read a real number for a token reader.
	Param  Type  Description access This  Token_Reader'Class  return  Real  The real number that was read.

		function Read_String
	Read characters from input until String_Quote is found.
	Param  Type  Description access This  Token_Reader'Class  return  String  The string that was read.

		procedure Read_Token
	If the current character is String_Quote, read a string, otherwise read a word. The result is stored in This.Token.
	Param  Type  Description access This  Token_Reader'Class

		function Read_Token
	If the current character is String_Quote, read a string, otherwise read a word. The result is stored in This.Token and also returned for immediate checking.
	Param  Type  Description access This  Token_Reader'Class  return  String  The token that was read.

		function Get_Token
	Get the current token from a token reader.
	Param  Type  Description access This  Token_Reader'Class  return  String  The token that was last read.

		procedure Set_Token
	Modify the current token of a token reader.
	Param  Type  Description access This  Token_Reader'Class  in Token  String  The new token value.

		function Found
	Check if a given token was found.
	Param  Type  Description access This  Token_Reader'Class  in Token  String  Check if this text was found. return  Boolean  True if the given token was found.