Defines a scanner that can read and unread characters and count lines. This scanner is used by tokenizers to process input streams.
Description
The IScanner interface defines a scanner that can read and unread characters and count lines.
Instance methods
column
Gets the column in the current line.
column(): number
- returns: number - column in the current line in the stream.
line
Gets the current line number
line(): number
- returns: number - current line number in the stream
peek
Returns the character from the top of the stream without moving the stream pointer.
peek(): number
- returns: number - character from the top of the stream or -1 if the stream is empty.
peekColumn
Gets the next character column number.
peekColumn(): number
- returns: number - next character column number in the stream.
peekLine
Gets the next character line number.
peekLine(): number
- returns: number - next character line number in the stream.
read
Reads a character from the top of the stream.
read(): number
- returns: number - read character or -1 if the stream is processed to the end.
reset
Resets a scanner to the initial position.
reset(): void
unread
Puts a character back into the stream.
unread(): void
unreadMany
Pushes the specified number of characters to the top of the stream.
unreadMany(count: number): void
- count: number - number of characcted to be pushed back.