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(in-package #:monparser)
(defclass text ()
((index :type (unsigned-byte 44) :initarg :index :accessor index :initform 0)
(data :type simple-string :initarg :data :reader data :initform "")))
(defun has-data? (cursor)
(< (index cursor) (length (data cursor))))
(defun peek (cursor)
(char (data cursor)
(index cursor)))
(defun advance (cursor)
(make-instance 'text
:data (data cursor)
:index (+ (index cursor) 1)))
(defun distance (from to)
(- (index to)
(index from)))
(defun context-window (str index &key (side-length 20))
(let ((begin (max (- index side-length) 0))
(end (min (+ index side-length) (length str)))
(result '()))
(push (subseq str (1+ index) end) result)
(push (elt str index) result)
(push (subseq str begin index) result)
result))
(defmethod print-object ((obj text) stream)
(print-unreadable-object (obj stream :type t)
(let ((str (if (has-data? obj)
(format nil "~{~a[4;33m~a[m~a~}"
(context-window (data obj)
(index obj)
:side-length 10))
"END OF DATA")))
(format stream "~s" (substitute #\~ #\Newline str)))))
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