Folks,
I am writing a parser that will eventually take a string syntax object
to parse. I want to report errors where they are in the source file;
and with port-count-lines, and a bit of basic arithmetic, I should be
able to do this trivially. Except... for simple tests I will be using
quoted strings; but in anger, I will be using here strings.
;; ---------------------------------------------------------------------
#lang racket
(define-syntax (wheres-my-string stx)
(syntax-case stx ()
[(_ s)
(eprintf "col: ~a span: ~a (string-length ~a) ~s~%"
(syntax-column #'s)
(syntax-span #'s)
(string-length (syntax-e #'s))
#'s)
#'s]))
(wheres-my-string "abc")
(wheres-my-string #<<$
abc
$
)
;; ---------------------------------------------------------------------
My stderr output is:
col: 18 span: 5 (string-length 3) #<syntax:...>
col: 18 span: 10 (string-length 3) #<syntax:...>
The syntax objects, when printed in DrRacket don’t have anything more
to distinguish an ordinary string from an inline string.
Aside from (- span string-length) being 2 or >= 7, is there any better
way to identify the here string?
Thanks,
Tim
PS: Ow, I’ve just thought; I’ve got a similar problem with:
(parse "'Hello\", said John")
and its #\\ quoting. Does anyone have any ideas about this
--
Tim Brown CEng MBCS <tim.br...@cityc.co.uk>
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