From 425ef692da7e74112f88f0b368f3286dba84f846 Mon Sep 17 00:00:00 2001 From: Nicholas Noll Date: Thu, 18 Jun 2020 19:45:40 -0700 Subject: feat: working parser for rc shell language --- sys/libterm/buffer.c | 326 --------------------------------------------------- 1 file changed, 326 deletions(-) delete mode 100644 sys/libterm/buffer.c (limited to 'sys/libterm/buffer.c') diff --git a/sys/libterm/buffer.c b/sys/libterm/buffer.c deleted file mode 100644 index b903e71..0000000 --- a/sys/libterm/buffer.c +++ /dev/null @@ -1,326 +0,0 @@ -#include "term.h" - -/* row operations */ -void -zero(Row *row, int start, int len) -{ - int i; - Cell cell = { - .r = L'\0', - .pen = {0}, - }; - - for (i = start; i < len + start; i++) - row->cells[i] = cell; - row->dirty = true; -} - -void -roll(Row *start, Row *end, int count) -{ - int n = end - start; - - count %= n; - if (count < 0) - count += n; - - if (count) { - char buf[count * sizeof(Row)]; - memcpy(buf, start, count * sizeof(Row)); - memmove(start, start + count, (n - count) * sizeof(Row)); - memcpy(end - count, buf, count * sizeof(Row)); - for (Row *row = start; row < end; row++) - row->dirty = true; - } -} - -/* buffer operations */ -void -bclear(Buffer *b) -{ - int i; - Cell cell = { - .r = L'\0', - .pen = { - .state = PenNormal, - .col.fg = -1, - .col.bg = -1, - }, - }; - - for (i = 0; i < b->nrow; i++) { - Row *row = b->row + i; - for (int j = 0; j < b->ncol; j++) { - row->cells[j] = cell; - row->dirty = true; - } - } -} - -void -bfree(Buffer *b) -{ - int i; - - for (i = 0; i < b->nrow; i++) - free(b->row[i].cells); - - free(b->row); - - for (i = 0; i < b->scroll.size; i++) - free(b->scroll.buf[i].cells); - - free(b->scroll.buf); - free(b->tabs); -} - -void -bscroll(Buffer *b, int s) -{ - /* work in screenfuls */ - int ssz = b->scroll.bot - b->scroll.top; - - if (s > ssz) { - bscroll(b, ssz); - bscroll(b, s - ssz); - return; - } - if (s < -ssz) { - bscroll(b, -ssz); - bscroll(b, s + ssz); - return; - } - - b->scroll.above += s; - if (b->scroll.above >= b->scroll.size) - b->scroll.above = b->scroll.size; - - if (s > 0 && b->scroll.size) { - for (int i = 0; i < s; i++) { - Row tmp = b->scroll.top[i]; - b->scroll.top[i] = b->scroll.buf[b->scroll.index]; - b->scroll.buf[b->scroll.index] = tmp; - - b->scroll.index++; - if (b->scroll.index == b->scroll.size) - b->scroll.index = 0; - } - } - roll(b->scroll.top, b->scroll.bot, s); - if (s < 0 && b->scroll.size) { - for (int i = (-s) - 1; i >= 0; i--) { - b->scroll.index--; - if (b->scroll.index == -1) - b->scroll.index = b->scroll.size - 1; - - Row tmp = b->scroll.top[i]; - b->scroll.top[i] = b->scroll.buf[b->scroll.index]; - b->scroll.buf[b->scroll.index] = tmp; - b->scroll.top[i].dirty = true; - } - } -} - -void -bresize(Buffer *b, int nrow, int ncol) -{ - Row *row = b->row; - - if (b->nrow != nrow) { - if (b->crow >= row + nrow) { - /* scroll up instead of simply chopping off bottom */ - bscroll(b, (b->crow - b->row) - nrow + 1); - } - while (b->nrow > nrow) { - free(row[b->nrow - 1].cells); - b->nrow--; - } - - row = realloc(row, sizeof(Row) * nrow); - } - - if (b->maxcols < ncol) { - for (int r = 0; r < b->nrow; r++) { - row[r].cells = realloc(row[r].cells, sizeof(Cell) * ncol); - if (b->ncol < ncol) - zero(row + r, b->ncol, ncol - b->ncol); - row[r].dirty = true; - } - Row *sbuf = b->scroll.buf; - for (int r = 0; r < b->scroll.size; r++) { - sbuf[r].cells = realloc(sbuf[r].cells, sizeof(Cell) * ncol); - if (b->ncol < ncol) - zero(sbuf + r, b->ncol, ncol - b->ncol); - } - b->tabs = realloc(b->tabs, sizeof(*b->tabs) * ncol); - for (int c = b->ncol; c < ncol; c++) - b->tabs[c] = !(c & 7); - b->maxcols = ncol; - b->ncol = ncol; - } else if (b->ncol != ncol) { - for (int r = 0; r < b->nrow; r++) - row[r].dirty = true; - b->ncol = ncol; - } - - int deltarows = 0; - if (b->nrow < nrow) { - while (b->nrow < nrow) { - row[b->nrow].cells = calloc(b->maxcols, sizeof(Cell)); - zero(row + b->nrow, 0, b->maxcols); - b->nrow++; - } - - /* prepare for backfill */ - if (b->crow >= b->scroll.bot - 1) { - deltarows = b->row + nrow - b->crow - 1; - if (deltarows > b->scroll.above) - deltarows = b->scroll.above; - } - } - - b->crow += row - b->row; - b->scroll.top = row; - b->scroll.bot = row + nrow; - b->row = row; - - /* perform backfill */ - if (deltarows > 0) { - bscroll(b, -deltarows); - b->crow += deltarows; - } -} - -bool -binit(Buffer *b, int rows, int cols, int size) -{ - b->pen.state = PenNormal; - b->pen.col.fg = b->pen.col.fg = -1; - - if (size < 0) - size = 0; - if (size && !(b->scroll.buf = calloc(size, sizeof(Row)))) - return false; - - b->scroll.size = size; - bresize(b, rows, cols); - return true; -} - -void -bboundary(Buffer *b, Row **bs, Row **be, Row **as, Row **ae) -{ - if (bs) - *bs = nil; - if (be) - *be = nil; - if (as) - *as = nil; - if (ae) - *ae = nil; - if (!b->scroll.size) - return; - - if (b->scroll.above) { - if (bs) - *bs = &b->scroll.buf[(b->scroll.index - b->scroll.above + b->scroll.size) % b->scroll.size]; - if (be) - *be = &b->scroll.buf[(b->scroll.index-1 + b->scroll.size) % b->scroll.size]; - } - if (b->scroll.below) { - if (as) - *as = &b->scroll.buf[b->scroll.index]; - if (ae) - *ae = &b->scroll.buf[(b->scroll.index + b->scroll.below-1) % b->scroll.size]; - } -} - -Row * -browfirst(Buffer *b) -{ - Row *bstart; - if (!b->scroll.size || !b->scroll.above) - return b->row; - bboundary(b, &bstart, nil, nil, nil); - return bstart; -} - -Row * -browlast(Buffer *b) -{ - Row *aend; - if (!b->scroll.size || !b->scroll.below) - return b->row + b->nrow - 1; - bboundary(b, nil, nil, nil, &aend); - return aend; -} - -Row * -brownext(Buffer *b, Row *row) -{ - Row *before_start, *before_end, *after_start, *after_end; - Row *first = b->row, *last = b->row + b->nrow - 1; - - if (!row) - return nil; - - bboundary(b, &before_start, &before_end, &after_start, &after_end); - - if (row >= first && row < last) - return ++row; - if (row == last) - return after_start; - if (row == before_end) - return first; - if (row == after_end) - return nil; - if (row == &b->scroll.buf[b->scroll.size - 1]) - return b->scroll.buf; - return ++row; -} - -Row * -bprevrow(Buffer *b, Row *row) -{ - Row *before_start, *before_end, *after_start, *after_end; - Row *first = b->row, *last = b->row + b->nrow - 1; - - if (!row) - return nil; - - bboundary(b, &before_start, &before_end, &after_start, &after_end); - - if (row > first && row <= last) - return --row; - if (row == first) - return before_end; - if (row == before_start) - return nil; - if (row == after_start) - return last; - if (row == b->scroll.buf) - return &b->scroll.buf[b->scroll.size - 1]; - return --row; -} - -void -brender(Buffer *b, Term *t) -{ - int r, c, n; - char u[UTFmax+1]; - Row *row; - Cell *cell; - - for (r = 0; r < b->nrow; r++) { - row = b->row + r; - if (!row->dirty) - continue; - - for (c = 0; c < b->ncol; c++) { - cell = row->cells + c; - tsetpen(t, cell->pen); - n = utf8·runetobyte(u, &cell->r); - twrite(t, n, u); - } - } -} -- cgit v1.2.1