From 3a823fb43ba0abe52f3152d337675e9ed9a3f175 Mon Sep 17 00:00:00 2001 From: Robin Haberkorn Date: Wed, 4 Dec 2024 02:22:36 +0300 Subject: implemented ^Y/^S commands for receiving pattern match/insertion ranges and lengths (refs #27) * Allows storing pattern matches into Q-Registers (^YXq). * You can also refer to subpatterns marked by ^E[...] by passing a number > 0. This is equivalent to \0-9 references in many programming languages. * It's especially useful for supporting TECO's equivalent of structural regular expressions. This will be done with additional macros. * You can also simply back up to the beginning of an insertion or search. So I...$^SC leaves dot at the beginning of the insertion. S...$^SC leaves dot before the found pattern. This has been previously requested by users. * Perhaps there should be ^Y string building characters as well to backreference in search-replacement commands (TODO). This means that the search commands would have to store the matched text itself in teco_range_t structures since FR deletes the matched text before processing the replacement string. It could also be made into a FR/FS-specific construct, so we don't fetch the substrings unnecessarily. * This differs from DEC TECO in always returning the same range even after dot movements, since we are storing start/end byte positions instead of only the length. Also DEC TECO does not support fetching subpattern ranges. --- src/error.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src/error.h') diff --git a/src/error.h b/src/error.h index 5ffd434..2df7b89 100644 --- a/src/error.h +++ b/src/error.h @@ -44,6 +44,7 @@ typedef enum { TECO_ERROR_MOVE, TECO_ERROR_WORDS, TECO_ERROR_RANGE, + TECO_ERROR_SUBPATTERN, TECO_ERROR_INVALIDQREG, TECO_ERROR_QREGOPUNSUPPORTED, TECO_ERROR_QREGCONTAINSNULL, @@ -107,6 +108,13 @@ teco_error_range_set(GError **error, const gchar *cmd) "Invalid range specified for <%s>", cmd); } +static inline void +teco_error_subpattern_set(GError **error, const gchar *cmd) +{ + g_set_error(error, TECO_ERROR, TECO_ERROR_SUBPATTERN, + "Invalid subpattern specified for <%s>", cmd); +} + static inline void teco_error_invalidqreg_set(GError **error, const gchar *name, gsize len, gboolean local) { -- cgit v1.2.3