diff options
author | wrmr | 2024-11-03 13:32:33 -0500 |
---|---|---|
committer | wrmr | 2024-11-03 13:32:33 -0500 |
commit | d16f78195865c200481123caaa91e52152ffdc41 (patch) | |
tree | 4ca9ae1c487f19807018ddf113f1baf608d445c5 | |
parent | 332db163a4524552b583776bd3ff172b8eadbf5c (diff) |
move messy internal line navigation logic into doc.c
-rw-r--r-- | doc.c | 30 | ||||
-rw-r--r-- | doc.h | 4 | ||||
-rw-r--r-- | nav.c | 17 |
3 files changed, 37 insertions, 14 deletions
diff --git a/doc.c b/doc.c index d5da6bf..3d1b378 100644 --- a/doc.c +++ b/doc.c @@ -5,6 +5,8 @@ #include "doc.h" #include "err.h" +/* initialization / destruction */ + void doc_init(struct doc *d) { buf_init(&d->txt, sizeof(struct doc_line)); buf_init(&d->lnk, 1); @@ -22,6 +24,8 @@ void doc_fini(struct doc *d) { buf_free(&d->lnk); } +/* line creation */ + void doc_new_line(struct doc *d) { buf_grow(&d->txt, sizeof(struct doc_line)); *(struct doc_line *)&d->txt.buf[d->txt.sz] = (struct doc_line) { @@ -49,3 +53,29 @@ void doc_add_textn(struct doc *d, const char *s, size_t n) { d->txt.sz += n; dl->len += n; } + +/* line navigation */ + +struct doc_line *doc_line_at(struct doc *d, size_t ofs) { + return (struct doc_line *)&d->txt.buf[ofs]; +} + +int doc_line_prev(struct doc *d, size_t *ofs) { + size_t n = doc_line_at(d, *ofs)->prev + sizeof(struct doc_line); + if (*ofs >= n) { + *ofs -= n; + return 0; + } else { + return -1; + } +} + +int doc_line_next(struct doc *d, size_t *ofs) { + size_t n = doc_line_at(d, *ofs)->len + sizeof(struct doc_line); + if (*ofs + n < d->txt.sz) { + *ofs += n; + return 0; + } else { + return -1; + } +} diff --git a/doc.h b/doc.h index 496b631..972134b 100644 --- a/doc.h +++ b/doc.h @@ -30,4 +30,8 @@ void doc_add_line(struct doc *, const char *); void doc_add_text(struct doc *, const char *); void doc_add_textn(struct doc *, const char *, size_t); +struct doc_line *doc_line_at(struct doc *d, size_t ofs); +int doc_line_prev(struct doc *d, size_t *ofs); +int doc_line_next(struct doc *d, size_t *ofs); + #endif diff --git a/nav.c b/nav.c index 8df829e..6d81ddd 100644 --- a/nav.c +++ b/nav.c @@ -51,26 +51,15 @@ size_t pg_lines(void) { } struct doc_line *nav_cur_line(struct nav_state *ns) { - return (struct doc_line *)&ns->histv[ns->cur_doc].txt.buf[ns->cur_ofs[ns->cur_doc]]; + return doc_line_at(&ns->histv[ns->cur_doc], ns->cur_ofs[ns->cur_doc]); } int nav_line_up(struct nav_state *ns) { - if (ns->cur_ofs[ns->cur_doc] > 0) { - ns->cur_ofs[ns->cur_doc] -= nav_cur_line(ns)->prev + sizeof(struct doc_line); - return 1; - } else { - return 0; - } + return !doc_line_prev(&ns->histv[ns->cur_doc], &ns->cur_ofs[ns->cur_doc]); } int nav_line_down(struct nav_state *ns) { - struct doc_line *l = nav_cur_line(ns); - if (ns->cur_ofs[ns->cur_doc] + sizeof(struct doc_line) + l->len < ns->histv[ns->cur_doc].txt.sz) { - ns->cur_ofs[ns->cur_doc] += l->len + sizeof(struct doc_line); - return 1; - } else { - return 0; - } + return !doc_line_next(&ns->histv[ns->cur_doc], &ns->cur_ofs[ns->cur_doc]); } void nav_pg_up(struct nav_state *ns) { |