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teliva/anagrams.tlv

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# .tlv file generated by https://github.com/akkartik/teliva
# You may edit it if you are careful; however, you may see cryptic errors if you
# violate Teliva's assumptions.
#
# .tlv files are representations of Teliva programs. Teliva programs consist of
# sequences of definitions. Each definition is a table of key/value pairs. Keys
# and values are both strings.
#
# Lines in .tlv files always follow exactly one of the following forms:
# - comment lines at the top of the file starting with '#' at column 0
# - beginnings of definitions starting with '- ' at column 0, followed by a
# key/value pair
# - key/value pairs consisting of ' ' at column 0, containing either a
# spaceless value on the same line, or a multi-line value
# - multiline values indented by more than 2 spaces, starting with a '>'
#
# If these constraints are violated, Teliva may unceremoniously crash. Please
# report bugs at http://akkartik.name/contact
- __teliva_timestamp: original
str_helpers:
>-- some string helpers from http://lua-users.org/wiki/StringIndexing
>
>-- index characters using []
>getmetatable('').__index = function(str,i)
> if type(i) == 'number' then
> return str:sub(i,i)
> else
> return string[i]
> end
>end
>
>-- ranges using (), selected bytes using {}
>getmetatable('').__call = function(str,i,j)
> if type(i)~='table' then
> return str:sub(i,j)
> else
> local t={}
> for k,v in ipairs(i) do
> t[k]=str:sub(v,v)
> end
> return table.concat(t)
> end
>end
>
>-- iterate over an ordered sequence
>function q(x)
> if type(x) == 'string' then
> return x:gmatch('.')
> else
> return ipairs(x)
> end
>end
>
>-- insert within string
>function string.insert(str1, str2, pos)
> return str1:sub(1,pos)..str2..str1:sub(pos+1)
>end
>
>function string.remove(s, pos)
> return s:sub(1,pos-1)..s:sub(pos+1)
>end
>
>function string.pos(s, sub)
> return string.find(s, sub, 1, true) -- plain=true to disable regular expressions
>end
>
>-- TODO: backport utf-8 support from Lua 5.3
- __teliva_timestamp: original
debugy:
>debugy = 5
- __teliva_timestamp: original
dbg:
>-- helper for debug by print; overlay debug information towards the right
>-- reset debugy every time you refresh screen
>function dbg(window, s)
> local oldy = 0
> local oldx = 0
> oldy, oldx = window:getyx()
> window:mvaddstr(debugy, 60, s)
> debugy = debugy+1
> window:mvaddstr(oldy, oldx, '')
>end
- __teliva_timestamp: original
check:
>function check(x, msg)
> if x then
> Window:addch('.')
> else
> print('F - '..msg)
> print(' '..str(x)..' is false/nil')
> teliva_num_test_failures = teliva_num_test_failures + 1
> -- overlay first test failure on editors
> if teliva_first_failure == nil then
> teliva_first_failure = msg
> end
> end
>end
- __teliva_timestamp: original
check_eq:
>function check_eq(x, expected, msg)
> if eq(x, expected) then
> Window:addch('.')
> else
> print('F - '..msg)
> print(' expected '..str(expected)..' but got '..str(x))
> teliva_num_test_failures = teliva_num_test_failures + 1
> -- overlay first test failure on editors
> if teliva_first_failure == nil then
> teliva_first_failure = msg
> end
> end
>end
- __teliva_timestamp: original
eq:
>function eq(a, b)
> if type(a) ~= type(b) then return false end
> if type(a) == 'table' then
> if #a ~= #b then return false end
> for k, v in pairs(a) do
> if b[k] ~= v then
> return false
> end
> end
> for k, v in pairs(b) do
> if a[k] ~= v then
> return false
> end
> end
> return true
> end
> return a == b
>end
- __teliva_timestamp: original
str:
>-- smarter tostring
>-- slow; used only for debugging
>function str(x)
> if type(x) == 'table' then
> local result = ''
> result = result..#x..'{'
> for k, v in pairs(x) do
> result = result..str(k)..'='..str(v)..', '
> end
> result = result..'}'
> return result
> elseif type(x) == 'string' then
> return '"'..x..'"'
> end
> return tostring(x)
>end
- __teliva_timestamp: original
find_index:
>function find_index(arr, x)
> for n, y in ipairs(arr) do
> if x == y then
> return n
> end
> end
>end
- __teliva_timestamp: original
trim:
>function trim(s)
> return s:gsub('^%s*', ''):gsub('%s*$', '')
>end
- __teliva_timestamp: original
split:
>function split(s, d)
> result = {}
> for match in (s..d):gmatch("(.-)"..d) do
> table.insert(result, match);
> end
> return result
>end
- __teliva_timestamp: original
map:
>-- only for arrays
>function map(l, f)
> result = {}
> for _, x in ipairs(l) do
> table.insert(result, f(x))
> end
> return result
>end
- __teliva_timestamp: original
reduce:
>-- only for arrays
>function reduce(l, f, init)
> result = init
> for _, x in ipairs(l) do
> result = f(result, x)
> end
> return result
>end
- __teliva_timestamp: original
filter:
>function filter(h, f)
> result = {}
> for k, v in pairs(h) do
> if f(k, v) then
> result[k] = v
> end
> end
> return result
>end
- __teliva_timestamp: original
ifilter:
>-- only for arrays
>function ifilter(l, f)
> result = {}
> for _, x in ipairs(l) do
> if f(x) then
> table.insert(result, x)
> end
> end
> return result
>end
- __teliva_timestamp: original
sort_letters:
>function sort_letters(s)
> tmp = {}
> for i=1,#s do
> table.insert(tmp, s[i])
> end
> table.sort(tmp)
> local result = ''
> for _, c in pairs(tmp) do
> result = result..c
> end
> return result
>end
>
>function test_sort_letters(s)
> check_eq(sort_letters(''), '', 'test_sort_letters: empty')
> check_eq(sort_letters('ba'), 'ab', 'test_sort_letters: non-empty')
> check_eq(sort_letters('abba'), 'aabb', 'test_sort_letters: duplicates')
>end
- __teliva_timestamp: original
count_letters:
>-- TODO: handle unicode
>function count_letters(s)
> local result = {}
> for i=1,s:len() do
> local c = s[i]
> if result[c] == nil then
> result[c] = 1
> else
> result[c] = result[c] + 1
> end
> end
> return result
>end
- __teliva_timestamp: original
count:
>-- turn an array of elements into a map from elements to their frequency
>-- analogous to count_letters for non-strings
>function count(a)
> local result = {}
> for i, v in ipairs(a) do
> if result[v] == nil then
> result[v] = 1
> else
> result[v] = result[v] + 1
> end
> end
> return result
>end
- __teliva_timestamp: original
union:
>function union(a, b)
> for k, v in pairs(b) do
> a[k] = v
> end
> return a
>end
- __teliva_timestamp: original
subtract:
>-- set subtraction
>function subtract(a, b)
> for k, v in pairs(b) do
> a[k] = nil
> end
> return a
>end
- __teliva_timestamp: original
all:
>-- universal quantifier on sets
>function all(s, f)
> for k, v in pairs(s) do
> if not f(k, v) then
> return false
> end
> end
> return true
>end
- __teliva_timestamp: original
to_array:
>-- turn a set into an array
>-- drops values
>function to_array(h)
> local result = {}
> for k, _ in pairs(h) do
> table.insert(result, k)
> end
> return result
>end
- __teliva_timestamp: original
append:
>-- concatenate list 'elems' into 'l', modifying 'l' in the process
>function append(l, elems)
> for i=1,#elems do
> table.insert(l, elems[i])
> end
>end
- __teliva_timestamp: original
prepend:
>-- concatenate list 'elems' into the start of 'l', modifying 'l' in the process
>function prepend(l, elems)
> for i=1,#elems do
> table.insert(l, i, elems[i])
> end
>end
- __teliva_timestamp: original
all_but:
>function all_but(x, idx)
> if type(x) == 'table' then
> local result = {}
> for i, elem in ipairs(x) do
> if i ~= idx then
> table.insert(result,elem)
> end
> end
> return result
> elseif type(x) == 'string' then
> if idx < 1 then return x:sub(1) end
> return x:sub(1, idx-1) .. x:sub(idx+1)
> else
> error('all_but: unsupported type '..type(x))
> end
>end
>
>function test_all_but()
> check_eq(all_but('', 0), '', 'all_but: empty')
> check_eq(all_but('abc', 0), 'abc', 'all_but: invalid low index')
> check_eq(all_but('abc', 4), 'abc', 'all_but: invalid high index')
> check_eq(all_but('abc', 1), 'bc', 'all_but: first index')
> check_eq(all_but('abc', 3), 'ab', 'all_but: final index')
> check_eq(all_but('abc', 2), 'ac', 'all_but: middle index')
>end
- __teliva_timestamp: original
set:
>function set(l)
> local result = {}
> for i, elem in ipairs(l) do
> result[elem] = true
> end
> return result
>end
- __teliva_timestamp: original
set_eq:
>function set_eq(l1, l2)
> return eq(set(l1), set(l2))
>end
>
>function test_set_eq()
> check(set_eq({1}, {1}), 'set_eq: identical')
> check(not set_eq({1, 2}, {1, 3}), 'set_eq: different')
> check(set_eq({1, 2}, {2, 1}), 'set_eq: order')
> check(set_eq({1, 2, 2}, {2, 1}), 'set_eq: duplicates')
>end
- __teliva_timestamp: original
clear:
>function clear(lines)
> while #lines > 0 do
> table.remove(lines)
> end
>end
- __teliva_timestamp: original
zap:
>function zap(target, src)
> clear(target)
> append(target, src)
>end
- __teliva_timestamp: original
mfactorial:
>-- memoized version of factorial
>-- doesn't memoize recursive calls, but may be good enough
>mfactorial = memo1(factorial)
- __teliva_timestamp: original
factorial:
>function factorial(n)
> local result = 1
> for i=1,n do
> result = result*i
> end
> return result
>end
- __teliva_timestamp: original
memo1:
>-- a higher-order function that takes a function of a single arg
>-- (that never returns nil)
>-- and returns a memoized version of it
>function memo1(f)
> local memo = {}
> return function(x)
> if memo[x] == nil then
> memo[x] = f(x)
> end
> return memo[x]
> end
>end
>
>-- mfactorial doesn't seem noticeably faster
>function test_memo1()
> for i=0,30 do
> check_eq(mfactorial(i), factorial(i), 'memo1 over factorial: '..str(i))
> end
>end
- __teliva_timestamp: original
num_permutations:
>-- number of permutations of n distinct objects, taken r at a time
>function num_permutations(n, r)
> return factorial(n)/factorial(n-r)
>end
>
>-- mfactorial doesn't seem noticeably faster
>function test_memo1()
> for i=0,30 do
> for j=0,i do
> check_eq(num_permutations(i, j), mfactorial(i)/mfactorial(i-j), 'num_permutations memoizes: '..str(i)..'P'..str(j))
> end
> end
>end
- __teliva_timestamp: original
menu:
>-- To show app-specific hotkeys in the menu bar, add hotkey/command
>-- arrays of strings to the menu array.
>menu = {
> {'^h', 'backspace'},
>}
- __teliva_timestamp: original
Window:
>Window = curses.stdscr()
- __teliva_timestamp: original
doc:blurb:
>Show all anagrams of a given word
- __teliva_timestamp: original
word:
>word = ''
- __teliva_timestamp: original
cursor:
>cursor = 1
- __teliva_timestamp: original
main:
>function main()
> Window:nodelay(true)
> while true do
> render(Window)
> update(Window)
> end
>end
- __teliva_timestamp: original
update:
>function update(window)
> local key
> while true do
> key = window:getch()
> if key then break end
> end
> if key == curses.KEY_LEFT then
> if cursor > 1 then
> cursor = cursor-1
> end
> elseif key == curses.KEY_RIGHT then
> if cursor <= #word then
> cursor = cursor+1
> end
> elseif key == curses.KEY_BACKSPACE or key == 8 or key == 127 then -- ctrl-h, ctrl-?, delete
> if cursor > 1 then
> cursor = cursor-1
> word = word:remove(cursor)
> end
> elseif key >= 32 and key < 127 then
> word = word:insert(string.char(key), cursor-1)
> cursor = cursor+1
> end
>end
- __teliva_timestamp: original
render:
>function render(window)
> window:clear()
>
> local prompt_str = ' what is your name? '
> window:attron(curses.A_REVERSE)
> window:mvaddstr(0, 0, prompt_str)
> window:attroff(curses.A_REVERSE)
> window:addstr(' ')
> window:attron(curses.A_BOLD)
> window:addstr(word)
> window:attroff(curses.A_BOLD)
> window:mvaddstr(2, 0, '')
> local results = anagrams(word)
> if #results > 0 then
> window:attron(curses.A_REVERSE)
> print(#results..' anagrams')
> window:attroff(curses.A_REVERSE)
> for i, w in ipairs(results) do
> window:addstr(w)
> window:addstr(' ')
> end
> end
>
> window:mvaddstr(0, string.len(prompt_str)+cursor, '')
> window:refresh()
>end
- __teliva_timestamp:
>Mon Feb 21 17:42:28 2022
anagrams:
>function anagrams(word)
> return gather(sort_letters(word))
>end
- __teliva_timestamp:
>Mon Feb 21 18:18:07 2022
gather:
>function gather(s)
> if s == '' then return {} end
> local result = {}
> for i=1, #s do
> if i == 1 or s[i] ~= s[i-1] then
> append(result, combine(s[i], gather(all_but(s, i))))
> end
> end
> return result
>end
- __teliva_timestamp: original
__teliva_note:
>basic version
combine:
>-- return 'l' with each element prefixed with 'prefix'
>function combine(prefix, l)
> if #l == 0 then return {prefix} end
> local result = {}
> for _, elem in ipairs(l) do
> table.insert(result, prefix..elem)
> end
> return result
>end
>
>function test_combine()
> check_eq(combine('abc', {}), {'abc'}, 'test_combine: empty list')
>end
- __teliva_timestamp:
>Sat Mar 5 15:24:00 2022
count_anagrams:
>function count_anagrams(s)
> local result = factorial(s:len())
> local letter_counts = count_letters(s)
> for l, cnt in pairs(letter_counts) do
> result = result / factorial(cnt)
> end
> return result
>end
- __teliva_timestamp:
>Sat Mar 5 15:53:23 2022
key_pressed:
>-- only works when nodelay (non-blocking keyboard)
>function key_pressed(window)
> local c = window:getch()
> if c == nil then return false end
> window:ungetch(c)
> return true
>end
- __teliva_timestamp:
>Sat Mar 5 15:55:34 2022
render:
>function render(window)
> window:clear()
>
> local prompt_str = ' what is your name? '
> window:attron(curses.A_REVERSE)
> window:mvaddstr(0, 0, prompt_str)
> window:attroff(curses.A_REVERSE)
> window:addstr(' ')
> window:attron(curses.A_BOLD)
> window:addstr(word)
> window:attroff(curses.A_BOLD)
> window:mvaddstr(2, 0, '')
> if #word > 0 then
> local num_anagrams = count_anagrams(word)
> window:attron(curses.A_REVERSE)
> print(num_anagrams..' anagrams')
> window:attroff(curses.A_REVERSE)
> local results = anagrams(word)
> if results == nil then -- interrupted
> window:addstr('...')
> else
> assert(#results == num_anagrams, "something's wrong; the count is unexpected")
> for i, w in ipairs(results) do
> window:addstr(w)
> window:addstr(' ')
> if key_pressed(window) then
> break
> end
> end
> end
> end
>
> window:mvaddstr(0, string.len(prompt_str)+cursor, '')
> window:refresh()
>end
- __teliva_timestamp:
>Sat Mar 5 15:56:35 2022
__teliva_note:
>restart computation when a key is pressed
gather:
>-- return a list of unique permutations of a sorted string 's'
>-- the letters in 's' must be in alphabetical order, so that duplicates are adjacent
>-- this function can take a long time for long strings, so we make it interruptible
>-- if a key is pressed, it returns nil
>-- since it's recursive, we also need to handle recursive calls returning nil
>function gather(s)
> if s == '' then return {} end
> local result = {}
> for i=1, #s do
> if i == 1 or s[i] ~= s[i-1] then
> local subresult = gather(all_but(s, i))
> if subresult == nil then return nil end -- interrupted
> append(result, combine(s[i], subresult))
> end
> if key_pressed(Window) then return nil end -- interrupted
> end
> return result
>end