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(in-package #:input)
(defclass input ()
((cursor :initarg :cursor :accessor cursor :initform 0)
(file :initarg :file :reader file :initform nil)
(data :initarg :data :reader data :initform nil)))
(defun has-data? (input)
(< (cursor input) (length (data input))))
(defun prefix? (target input)
(string= target
(data input)
:start2 (cursor input)
:end2 (min (+ (cursor input) (length target))
(length (data input)))))
(defun peek (input)
(char (data input)
(cursor input)))
(defun advance (input &optional (amount 1))
(make-instance 'input
:data (data input)
:file (file input)
:cursor (1+ (cursor input))))
(defun from-string (str)
(make-instance 'input :data str))
(defun from-file (filename)
(make-instance 'input :file filename :data (str:read-file filename)))
(defun line-and-column (input)
(let ((line 1) (column 1))
(dotimes (i (cursor input))
(let ((c (char (data input) i)))
(case c
(#\Newline
(incf line)
(setf column 1))
(t (incf column)))))
(values line column)))
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