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1 /**

2 * Name: rfc

3 * Description: RFC and Internet Draft reformatter.

4 *

5 * Some RFCs and Internet Drafts are broken in such a way

6 * that there is no linefeed character separating the

7 * pages. These documents are really pain to print

8 * because you have to know the exact page height. The

9 * `rfc' highlighting state fixes these broken documents

10 * by removing all unnecessary blank lines from the page

11 * breaks and by separating the pages with a formfeed

12 * character. This style also highlights the MUST, MUST

13 * NOT, REQUIRED SHALL, SHALL NOT, SHOULD, SHOULD NOT,

14 * RECOMMENDED, MAY, and OPTIONAL keywords, described by

15 * the RFC 2119.

16 *

17 * Author: Markku Rossi <mtr@iki.fi>

18 */

20 state rfc_page_separator_garbage extends Highlight

21 {

22 /^[ \t\f\r]*\n/ {

23 /* Skip all whitespace lines. */

24 }

25 /./ {

26 /* Print the correct separator line. */

27 language_print("\f\n");

28 language_print($0);

29 return;

30 }

31 }

33 state rfc extends HighlightEntry

34 {

35 /* Find the page separators and skip all whitespace lines after that. */

36 /\[[Pp]age[ \t]+[0-9]+[ \t]*\]\n/ {

37 language_print($0);

38 call(rfc_page_separator_garbage);

39 }

40 /* Highlight the keywords, described by the RFC 2119.

41 (build-re '(MUST NOT REQUIRED SHALL SHOULD RECOMMENDED MAY OPTIONAL))

42 */

43 /\b(M(AY|UST)|NOT|OPTIONAL|RE(COMMENDED|QUIRED)|SH(ALL|OULD))\b/ {

44 highlight_face(true);

45 language_print($0);

46 highlight_face(false);

47 }

48 }

50 \f

51 /*

52 Local variables:

53 mode: c

54 End:

55 */