snapshot: more tests for cursor_up
I think this may be all the tests. Now to make them pass..
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toot-toot.tlv
208
toot-toot.tlv
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@ -556,3 +556,211 @@
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> end
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> return newpos
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>end
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- cursor_up:
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>function cursor_up(s, old_idx, width)
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> local max = string.len(s)
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> local i = 1
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> -- compute oldcol, the screen column of old_idx
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> local oldcol = 0
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> local col = 0
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> curses.addstr('^')
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> while true do
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> curses.addstr('|'..i)
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> if i > max or i == old_idx then
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> oldcol = col
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> break
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> end
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> if s[i] == '\n' then
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> col = 0
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> else
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> col = col+1
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> if col == width then
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> col = 0
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> end
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> end
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> i = i+1
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> end
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> -- find previous newline
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> i = i-col-1
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> -- scan back to previous line
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> if s[i] == '\n' then
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> i = i-1
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> end
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> curses.addstr('c:'..col)
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> while true do
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> curses.addstr('>'..i)
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> if i < 1 then
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> -- current line is at top
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> break
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> end
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> if s[i] == '\n' then
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> break
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> end
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> i = i-1
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> end
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> -- compute index at same column on next line
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> -- i is at a newline
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> curses.addstr('/'..i)
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> i = i+1
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> col = 0
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> while true do
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> curses.addstr('>>'..i)
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> if i > max then
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> -- next line is at bottom and is too short; position at end of it
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> return i
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> end
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> if s[i] == '\n' then
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> -- next line is too short; position at end of it
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> return i
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> end
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> if col == oldcol then
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> return i
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> end
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> col = col+1
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> i = i+1
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> end
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>end
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>
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>function test_cursor_up()
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> -- tests without line-wrap
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> check_eq(cursor_up('abc\ndef', 1, 5), 1, 'cursor_up: top line first char')
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> check_eq(cursor_up('abc\ndef', 2, 5), 2, 'cursor_up: top line mid char')
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> check_eq(cursor_up('abc\ndef', 3, 5), 3, 'cursor_up: top line final char')
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> check_eq(cursor_up('abc\ndef', 4, 5), 4, 'cursor_up: top line end')
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> check_eq(cursor_up('abc\ndef', 5, 5), 1, 'cursor_up: non-top line first char')
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> check_eq(cursor_up('abc\ndef', 6, 5), 2, 'cursor_up: non-top line mid char')
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> check_eq(cursor_up('abc\ndef', 7, 5), 3, 'cursor_up: non-top line final char')
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> check_eq(cursor_up('abc\ndef\n', 8, 5), 4, 'cursor_up: non-top line end')
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> check_eq(cursor_up('ab\ndef\n', 7, 5), 3, 'cursor_up: to shorter line')
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>
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> -- tests with line-wrap
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> -- |abcde| <-- wrap, no newline
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> -- |fgh |
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> check_eq(cursor_up('abcdefgh', 6, 5), 1, 'cursor_up in wrapping line: first char')
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> check_eq(cursor_up('abcdefgh', 7, 5), 2, 'cursor_up in wrapping line: mid char')
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> check_eq(cursor_up('abcdefgh', 8, 5), 3, 'cursor_up in wrapping line: final char')
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> check_eq(cursor_up('abcdefgh', 9, 5), 4, 'cursor_up in wrapping line: wrapped line end')
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>
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> -- mixing lines with and without wrap
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> -- |abcde| <-- wrap, no newline
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> -- |fg |
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> -- |hij |
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> check_eq(cursor_up('abcdefg\nhij', 9, 5), 6, 'cursor_up to wrapping line: first char')
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> check_eq(cursor_up('abcdefg\nhij', 10, 5), 7, 'cursor_up to wrapping line: mid char')
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> check_eq(cursor_up('abcdefg\nhij', 11, 5), 8, 'cursor_up to wrapping line: final char')
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> check_eq(cursor_up('abcdefg\nhij', 12, 5), 8, 'cursor_up to wrapping line: to shorter line')
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>end
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__teliva_timestamp:
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>Thu Dec 23 07:24:20 2021
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- cursor_up:
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>function cursor_up(s, old_idx, width)
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> local max = string.len(s)
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> local i = 1
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> -- compute oldcol, the screen column of old_idx
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> local oldcol = 0
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> local col = 0
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> local previous_newline = 0
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> curses.addstr('^')
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> while true do
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> curses.addstr('|'..i)
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> if i > max or i == old_idx then
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> oldcol = col
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> break
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> end
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> if s[i] == '\n' then
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> col = 0
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> previous_newline = i
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> else
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> col = col+1
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> if col == width then
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> col = 0
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> end
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> end
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> i = i+1
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> end
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> -- find previous newline
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> i = i-col-1
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>--? curses.addstr('w'..old_idx..'-'..previous_newline)
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> if old_idx - previous_newline > width then
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> -- we're in a wrapped line
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> return old_idx - width
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> end
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> -- scan back to previous line
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> if s[i] == '\n' then
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> i = i-1
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> end
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> curses.addstr('c:'..col)
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> while true do
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> curses.addstr('>'..i)
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> if i < 1 then
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> -- current line is at top
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> break
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> end
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> if s[i] == '\n' then
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> break
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> end
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> i = i-1
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> end
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> -- compute index at same column on next line
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> -- i is at a newline
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> curses.addstr('/'..i)
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> i = i+1
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> col = 0
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> while true do
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> curses.addstr('>>'..i)
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> if i > max then
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> -- next line is at bottom and is too short; position at end of it
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> return i
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> end
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> if s[i] == '\n' then
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> -- next line is too short; position at end of it
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> return i
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> end
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> if col == oldcol then
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> return i
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> end
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> col = col+1
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> i = i+1
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> end
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>end
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>
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>function test_cursor_up()
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> -- lines that don't wrap
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> check_eq(cursor_up('abc\ndef', 1, 5), 1, 'cursor_up: top line first char')
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> check_eq(cursor_up('abc\ndef', 2, 5), 2, 'cursor_up: top line mid char')
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> check_eq(cursor_up('abc\ndef', 3, 5), 3, 'cursor_up: top line final char')
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> check_eq(cursor_up('abc\ndef', 4, 5), 4, 'cursor_up: top line end')
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> check_eq(cursor_up('abc\ndef', 5, 5), 1, 'cursor_up: non-top line first char')
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> check_eq(cursor_up('abc\ndef', 6, 5), 2, 'cursor_up: non-top line mid char')
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> check_eq(cursor_up('abc\ndef', 7, 5), 3, 'cursor_up: non-top line final char')
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> check_eq(cursor_up('abc\ndef\n', 8, 5), 4, 'cursor_up: non-top line end')
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> check_eq(cursor_up('ab\ndef\n', 7, 5), 3, 'cursor_up: to shorter line')
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>
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> -- within a single wrapping line
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> -- |abcde| <-- wrap, no newline
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> -- |fgh |
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> check_eq(cursor_up('abcdefgh', 6, 5), 1, 'cursor_up from wrapping line: first char')
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> check_eq(cursor_up('abcdefgh', 7, 5), 2, 'cursor_up from wrapping line: mid char')
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> check_eq(cursor_up('abcdefgh', 8, 5), 3, 'cursor_up from wrapping line: final char')
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> check_eq(cursor_up('abcdefgh', 9, 5), 4, 'cursor_up from wrapping line: wrapped line end')
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>
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> -- within a single very long wrapping line
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> -- |abcde| <-- wrap, no newline
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> -- |fghij| <-- wrap, no newline
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> -- |klm |
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> check_eq(cursor_up('abcdefghijklm', 11, 5), 6, 'cursor_up within wrapping line: first char')
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> check_eq(cursor_up('abcdefghijklm', 12, 5), 7, 'cursor_up within wrapping line: mid char')
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> check_eq(cursor_up('abcdefghijklm', 13, 5), 8, 'cursor_up within wrapping line: final char')
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> check_eq(cursor_up('abcdefghijklm', 14, 5), 9, 'cursor_up within wrapping line: wrapped line end')
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>
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> -- from below to (the bottom of) a wrapping line
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> -- |abcde| <-- wrap, no newline
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> -- |fg |
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> -- |hij |
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> check_eq(cursor_up('abcdefg\nhij', 9, 5), 6, 'cursor_up to wrapping line: first char')
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> check_eq(cursor_up('abcdefg\nhij', 10, 5), 7, 'cursor_up to wrapping line: mid char')
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> check_eq(cursor_up('abcdefg\nhij', 11, 5), 8, 'cursor_up to wrapping line: final char')
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> check_eq(cursor_up('abcdefg\nhij', 12, 5), 8, 'cursor_up to wrapping line: to shorter line')
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>end
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__teliva_timestamp:
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>Thu Dec 23 07:50:58 2021
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