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<tr><td class='sub'>Fork of Lua 5.1 to encourage end-user programming</td><td class='sub right'>Kartik K. Agaram <vc@akkartik.com></td></tr></table>
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</pre></td>
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.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span>teliva_program = {
window = [==[
window = curses.stdscr()
-- animation-based app
window:nodelay(true)
lines, cols = window:getmaxyx()]==],
grid = [==[
-- main data structure
grid = {}
for i=1,lines*4 do
grid[i] = {}
for j=1,cols*2 do
grid[i][j] = 0
end
end
]==],
grid_char = [==[
-- grab a 4x2 chunk of grid
function grid_char(line, col)
result = {}
for l, row in ipairs({unpack(grid, (line-1)*4+1, line*4)}) do
result[l] = {unpack(row, (col-1)*2+1, col*2)}
end
return result
end]==],
print_grid_char = [==[
function print_grid_char(window, x)
result = {}
for l, row in ipairs(x) do
for c, val in ipairs(row) do
window:mvaddstr(l, c, val)
end
end
return result
end]==],
glyph = [==[
-- look up the braille pattern corresponding to a 4x2 chunk of grid
-- https://en.wikipedia.org/wiki/Braille_Patterns
-- not obviously programmatic because Unicode added 4x2 after 3x2
glyph = {
0x2800, 0x2801, 0x2802, 0x2803, 0x2804, 0x2805, 0x2806, 0x2807, 0x2840, 0x2841, 0x2842, 0x2843, 0x2844, 0x2845, 0x2846, 0x2847,
0x2808, 0x2809, 0x280a, 0x280b, 0x280c, 0x280d, 0x280e, 0x280f, 0x2848, 0x2849, 0x284a, 0x284b, 0x284c, 0x284d, 0x284e, 0x284f,
0x2810, 0x2811, 0x2812, 0x2813, 0x2814, 0x2815, 0x2816, 0x2817, 0x2850, 0x2851, 0x2852, 0x2853, 0x2854, 0x2855, 0x2856, 0x2857,
0x2818, 0x2819, 0x281a, 0x281b, 0x281c, 0x281d, 0x281e, 0x281f, 0x2858, 0x2859, 0x285a, 0x285b, 0x285c, 0x285d, 0x285e, 0x285f,
0x2820, 0x2821, 0x2822, 0x2823, 0x2824, 0x2825, 0x2826, 0x2827, 0x2860, 0x2861, 0x2862, 0x2863, 0x2864, 0x2865, 0x2866, 0x2867,
0x2828, 0x2829, 0x282a, 0x282b, 0x282c, 0x282d, 0x282e, 0x282f, 0x2868, 0x2869, 0x286a, 0x286b, 0x286c, 0x286d, 0x286e, 0x286f,
0x2830, 0x2831, 0x2832, 0x2833, 0x2834, 0x2835, 0x2836, 0x2837, 0x2870, 0x2871, 0x2872, 0x2873, 0x2874, 0x2875, 0x2876, 0x2877,
0x2838, 0x2839, 0x283a, 0x283b, 0x283c, 0x283d, 0x283e, 0x283f, 0x2878, 0x2879, 0x287a, 0x287b, 0x287c, 0x287d, 0x287e, 0x287f,
0x2880, 0x2881, 0x2882, 0x2883, 0x2884, 0x2885, 0x2886, 0x2887, 0x28c0, 0x28c1, 0x28c2, 0x28c3, 0x28c4, 0x28c5, 0x28c6, 0x28c7,
0x2888, 0x2889, 0x288a, 0x288b, 0x288c, 0x288d, 0x288e, 0x288f, 0x28c8, 0x28c9, 0x28ca, 0x28cb, 0x28cc, 0x28cd, 0x28ce, 0x28cf,
0x2890, 0x2891, 0x2892, 0x2893, 0x2894, 0x2895, 0x2896, 0x2897, 0x28d0, 0x28d1, 0x28d2, 0x28d3, 0x28d4, 0x28d5, 0x28d6, 0x28d7,
0x2898, 0x2899, 0x289a, 0x289b, 0x289c, 0x289d, 0x289e, 0x289f, 0x28d8, 0x28d9, 0x28da, 0x28db, 0x28dc, 0x28dd, 0x28de, 0x28df,
0x28a0, 0x28a1, 0x28a2, 0x28a3, 0x28a4, 0x28a5, 0x28a6, 0x28a7, 0x28e0, 0x28e1, 0x28e2, 0x28e3, 0x28e4, 0x28e5, 0x28e6, 0x28e7,
0x28a8, 0x28a9, 0x28aa, 0x28ab, 0x28ac, 0x28ad, 0x28ae, 0x28af, 0x28e8, 0x28e9, 0x28ea, 0x28eb, 0x28ec, 0x28ed, 0x28ee, 0x28ef,
0x28b0, 0x28b1, 0x28b2, 0x28b3, 0x28b4, 0x28b5, 0x28b6, 0x28b7, 0x28f0, 0x28f1, 0x28f2, 0x28f3, 0x28f4, 0x28f5, 0x28f6, 0x28f7,
0x28b8, 0x28b9, 0x28ba, 0x28bb, 0x28bc, 0x28bd, 0x28be, 0x28bf, 0x28f8, 0x28f9, 0x28fa, 0x28fb, 0x28fc, 0x28fd, 0x28fe, 0x28ff,
}]==],
utf8 = [==[
-- https://stackoverflow.com/questions/7983574/how-to-write-a-unicode-symbol-in-lua
function utf8(decimal)
local bytemarkers = { {0x7FF,192}, {0xFFFF,224}, {0x1FFFFF,240} }
if decimal<128 then return string.char(decimal) end
local charbytes = {}
for bytes,vals in ipairs(bytemarkers) do
if decimal<=vals[1] then
for b=bytes+1,2,-1 do
local mod = decimal%64
decimal = (decimal-mod)/64
charbytes[b] = string.char(128+mod)
end
charbytes[1] = string.char(vals[2]+decimal)
break
end
end
return table.concat(charbytes)
end]==],
grid_char_to_glyph_index = [==[
-- convert a chunk of grid into a number
function grid_char_to_glyph_index(g)
return g[1][1] + g[2][1]*2 + g[3][1]*4 + g[4][1]*8 +
g[1][2]*16 + g[2][2]*32 + g[3][2]*64 + g[4][2]*128 +
1 -- 1-indexing
end]==],
render = [==[
function render(window)
window:clear()
for line=1,lines do
for col=1,cols do
window:addstr(utf8(glyph[grid_char_to_glyph_index(grid_char(line, col))]))
end
end
curses.refresh()
end
]==],
state = [==[
function state(line, col)
if line < 1 or line > table.getn(grid) or col < 1 or col > table.getn(grid[1]) then
return 0
end
return grid[line][col]
end]==],
num_live_neighbors = [==[
function num_live_neighbors(line, col)
return state(line-1, col-1) + state(line-1, col) + state(line-1, col+1) +
state(line, col-1) + state(line, col+1) +
state(line+1, col-1) + state(line+1, col) + state(line+1, col+1)
end]==],
step = [==[
function step()
local new_grid = {}
for line=1,table.getn(grid) do
new_grid[line] = {}
for col=1,table.getn(grid[1]) do
local n = num_live_neighbors(line, col)
if n == 3 then
new_grid[line][col] = 1
elseif n == 2 then
new_grid[line][col] = grid[line][col]
else
new_grid[line][col] = 0
end
end
end
grid = new_grid
end]==],
sleep = [==[
function sleep(a)
local sec = tonumber(os.clock() + a);
while (os.clock() < sec) do
end
end]==],
file_exists = [==[
function file_exists(filename)
local f = io.open(filename, "r")
if f ~= nil then
io.close(f)
return true
else
return false
end
end]==],
load_file = [==[
function load_file(window, filename)
io.input(filename)
local line_index = lines
for line in io.lines() do
if line:sub(1,1) ~= '!' then -- comment; plaintext files can't have whitespace before comments
local col_index = cols
for c in line:gmatch(".") do
if c == '\r' then break end -- DOS line ending
if c == '.' then
grid[line_index][col_index] = 0
else
grid[line_index][col_index] = 1
end
col_index = col_index+1
end
line_index = line_index+1
end
end
end]==],
update = [==[
menu = {arrow="pan"}
function update(window, c)
if c == curses.KEY_LEFT then
for i=1,lines*4 do
for j=2,cols*2 do
grid[i][j-1] = grid[i][j]
end
grid[i][cols*2] = 0
end
elseif c == curses.KEY_DOWN then
for i=lines*4-1,1,-1 do
for j=1,cols*2 do
grid[i+1][j] = grid[i][j]
end
end
for j=1,cols*2 do
grid[1][j] = 0
end
elseif c == curses.KEY_UP then
for i=2,lines*4 do
for j=1,cols*2 do
grid[i-1][j] = grid[i][j]
end
end
for j=1,cols*2 do
grid[lines*4][j] = 0
end
elseif c == curses.KEY_RIGHT then
for i=1,lines*4 do
for j=cols*2-1,1,-1 do
grid[i][j+1] = grid[i][j]
end
grid[i][1] = 0
end
end
end]==],
main = [==[
function main()
for i=1,7 do
curses.init_pair(i, i, -1)
end
-- initialize grid based on commandline args
if (#arg == 0) then
-- by default, start from a deterministically random state
for i=1,lines*4 do
for j=1,cols*2 do
grid[i][j] = math.random(0, 1)
end
end
elseif arg[1] == "random" then
-- start from a non-deterministically random start state
math.randomseed(os.time())
for i=1,lines*4 do
for j=1,cols*2 do
grid[i][j] = math.random(0, 1)
end
end
-- shortcuts for some common patterns
elseif arg[1] == "pentomino" then
-- https://www.conwaylife.com/wiki/Pentomino
grid[83][172] = 1
grid[83][173] = 1
grid[84][173] = 1
grid[84][174] = 1
grid[85][173] = 1
elseif arg[1] == "glider" then
-- https://www.conwaylife.com/wiki/Glider
grid[5][4] = 1
grid[6][5] = 1
grid[7][3] = 1
grid[7][4] = 1
grid[7][5] = 1
elseif arg[1] == "blinker" then
-- https://www.conwaylife.com/wiki/Blinker
grid[7][3] = 1
grid[7][4] = 1
grid[7][5] = 1
elseif arg[1] == "block" then
-- https://www.conwaylife.com/wiki/Block
grid[5][4] = 1
grid[5][5] = 1
grid[6][4] = 1
grid[6][5] = 1
elseif arg[1] == "loaf" then
-- https://www.conwaylife.com/wiki/Loaf
grid[5][4] = 1
grid[5][5] = 1
grid[6][6] = 1
grid[7][6] = 1
grid[8][5] = 1
grid[7][4] = 1
grid[6][3] = 1
elseif file_exists(arg[1]) then
-- Load a file in the standard "plaintext" format: https://www.conwaylife.com/wiki/Plaintext
--
-- Each pattern page at https://www.conwaylife.com/wiki provides its
-- plaintext representation in a block called "Pattern Files" on the right.
--
-- For example, check out the list of Important Patterns at
-- https://www.conwaylife.com/wiki/Category:Patterns_with_Catagolue_frequency_class_0
load_file(window, arg[1])
end
-- main loop
while true do
render(window)
c = curses.getch()
update(window, c)
step()
end
end]==],
}
</pre></div>