dsl3.lua(檔案已創建)
| @@ -0,0 +1,179 @@ | |||
| 1 | + | local function eval (prog, env) | |
| 2 | + | local env = env or {} | |
| 3 | + | local last | |
| 4 | + | for _, fn in ipairs (prog) do | |
| 5 | + | last = fn (env) | |
| 6 | + | end | |
| 7 | + | return last | |
| 8 | + | end | |
| 9 | + | ||
| 10 | + | local function force (env) | |
| 11 | + | return function (x) | |
| 12 | + | if type (x) == "function" then | |
| 13 | + | x = x (env) | |
| 14 | + | end | |
| 15 | + | return x | |
| 16 | + | end | |
| 17 | + | end | |
| 18 | + | ||
| 19 | + | local function keywords_for (apply) | |
| 20 | + | return function (word_list) | |
| 21 | + | local keywords = {} | |
| 22 | + | for _, word in ipairs (word_list) do | |
| 23 | + | keywords[word] = apply | |
| 24 | + | end | |
| 25 | + | return setmetatable (keywords, {__call = function (t, ...) | |
| 26 | + | return apply(...) | |
| 27 | + | end}) | |
| 28 | + | end | |
| 29 | + | end | |
| 30 | + | ||
| 31 | + | local function default (apply) | |
| 32 | + | return function (operations) | |
| 33 | + | return setmetatable (operations, {__call = function (t, ...) | |
| 34 | + | return apply (...) | |
| 35 | + | end}) | |
| 36 | + | end | |
| 37 | + | end | |
| 38 | + | ||
| 39 | + | local function let (var) | |
| 40 | + | local _let = function (val) | |
| 41 | + | return function (env) | |
| 42 | + | env[force (env) (var)] = force (env) (val) | |
| 43 | + | end | |
| 44 | + | end | |
| 45 | + | return keywords_for (_let) { "equal", "be" } | |
| 46 | + | end | |
| 47 | + | ||
| 48 | + | local function get (var) | |
| 49 | + | return function (env) | |
| 50 | + | return env[force (env) (var)] | |
| 51 | + | end | |
| 52 | + | end | |
| 53 | + | ||
| 54 | + | local function add (x) | |
| 55 | + | local _add = function (y) | |
| 56 | + | return function (env) | |
| 57 | + | return force (env) (x) + force (env) (y) | |
| 58 | + | end | |
| 59 | + | end | |
| 60 | + | return keywords_for (_add) { "to", "with" } | |
| 61 | + | end | |
| 62 | + | ||
| 63 | + | local function subtract (x) | |
| 64 | + | local _sub = function (y) | |
| 65 | + | return function (env) | |
| 66 | + | return force (env) (x) - force (env) (y) | |
| 67 | + | end | |
| 68 | + | end | |
| 69 | + | ||
| 70 | + | return default (_sub) { | |
| 71 | + | from = function (y) | |
| 72 | + | return function (env) | |
| 73 | + | return force (env) (y) - force (env) (x) | |
| 74 | + | end | |
| 75 | + | end, | |
| 76 | + | ||
| 77 | + | with = _sub | |
| 78 | + | } | |
| 79 | + | end | |
| 80 | + | ||
| 81 | + | local function show (val) | |
| 82 | + | local _show = function (env) | |
| 83 | + | print (force (env) (val)) | |
| 84 | + | end | |
| 85 | + | ||
| 86 | + | return _show | |
| 87 | + | end | |
| 88 | + | ||
| 89 | + | local function is (a) | |
| 90 | + | local _equals = function (b) | |
| 91 | + | return function (env) | |
| 92 | + | return force (env) (a) == force (env) (b) | |
| 93 | + | end | |
| 94 | + | end | |
| 95 | + | ||
| 96 | + | return default (_equals) { | |
| 97 | + | greater_than = function (b) | |
| 98 | + | return function (env) | |
| 99 | + | return force (env) (a) > force (env) (b) | |
| 100 | + | end | |
| 101 | + | end, | |
| 102 | + | less_than = function (b) | |
| 103 | + | return function (env) | |
| 104 | + | return force (env) (a) < force (env) (b) | |
| 105 | + | end | |
| 106 | + | end, | |
| 107 | + | } | |
| 108 | + | end | |
| 109 | + | ||
| 110 | + | local function when (cond) | |
| 111 | + | local _when_true = function (when_true) | |
| 112 | + | local _when_false = function (when_false) | |
| 113 | + | return function (env) | |
| 114 | + | if force (env) (cond) then | |
| 115 | + | return eval (when_true, env) | |
| 116 | + | else | |
| 117 | + | return eval (when_false, env) | |
| 118 | + | end | |
| 119 | + | end | |
| 120 | + | end | |
| 121 | + | return { otherwise = _when_false } | |
| 122 | + | end | |
| 123 | + | return _when_true | |
| 124 | + | end | |
| 125 | + | ||
| 126 | + | local function seed_rand () | |
| 127 | + | math.randomseed (os.time ()) | |
| 128 | + | end | |
| 129 | + | ||
| 130 | + | local function rand () | |
| 131 | + | return math.random () | |
| 132 | + | end | |
| 133 | + | ||
| 134 | + | local function return_with (value) | |
| 135 | + | return function (env) | |
| 136 | + | return value | |
| 137 | + | end | |
| 138 | + | end | |
| 139 | + | ||
| 140 | + | local function define (name) | |
| 141 | + | return function (bindings) | |
| 142 | + | return function (body) | |
| 143 | + | return function (env) | |
| 144 | + | env[force (env) (name)] = { bindings, body } | |
| 145 | + | end | |
| 146 | + | end | |
| 147 | + | end | |
| 148 | + | end | |
| 149 | + | ||
| 150 | + | local function call (name) | |
| 151 | + | return function (args) | |
| 152 | + | return function (env) | |
| 153 | + | local call_env = setmetatable({}, {__index = env}) | |
| 154 | + | local bindings, body = env[name][1], env[name][2] | |
| 155 | + | for i, binding in ipairs (bindings) do | |
| 156 | + | call_env[binding] = force (env) (args[i]) | |
| 157 | + | end | |
| 158 | + | return eval (body, call_env) | |
| 159 | + | end | |
| 160 | + | end | |
| 161 | + | end | |
| 162 | + | ||
| 163 | + | ||
| 164 | + | eval { | |
| 165 | + | define "fib" { "n" } { | |
| 166 | + | when (is (get "n") .less_than (1)) { | |
| 167 | + | return_with (0) ; | |
| 168 | + | } .otherwise { | |
| 169 | + | when (is (get "n") (1)) { | |
| 170 | + | return_with (1) | |
| 171 | + | } .otherwise { | |
| 172 | + | let "n1" .equal (subtract (1) .from (get "n")) ; | |
| 173 | + | let "n2" .equal (subtract (2) .from (get "n")) ; | |
| 174 | + | add (call "fib" {get "n1"}) .with (call "fib" {get "n2"}) ; | |
| 175 | + | } | |
| 176 | + | } | |
| 177 | + | } ; | |
| 178 | + | show (call "fib" { 10 }) ; | |
| 179 | + | } | |
dsl2.lua
| @@ -106,6 +106,10 @@ local function when (cond) | |||
| 106 | 106 | return _when | |
| 107 | 107 | end | |
| 108 | 108 | ||
| 109 | + | local function seed_rand () | |
| 110 | + | math.randomseed (os.time ()) | |
| 111 | + | end | |
| 112 | + | ||
| 109 | 113 | local function rand () | |
| 110 | 114 | return math.random () | |
| 111 | 115 | end | |
| @@ -116,8 +120,9 @@ local function return_with (value) | |||
| 116 | 120 | end | |
| 117 | 121 | end | |
| 118 | 122 | ||
| 119 | - | math.randomseed (os.time ()) | |
| 123 | + | ||
| 120 | 124 | eval { | |
| 125 | + | seed_rand ; | |
| 121 | 126 | show ( | |
| 122 | 127 | when (is (rand) .greater_than (0.5)) { | |
| 123 | 128 | show "Wow! The value was..." ; | |
dsl2.lua(檔案已創建)
| @@ -0,0 +1,130 @@ | |||
| 1 | + | local function eval (prog, env) | |
| 2 | + | local env = env or {} | |
| 3 | + | local last | |
| 4 | + | for _, fn in ipairs (prog) do | |
| 5 | + | last = fn (env) | |
| 6 | + | end | |
| 7 | + | return last | |
| 8 | + | end | |
| 9 | + | ||
| 10 | + | local function force (env) | |
| 11 | + | return function (x) | |
| 12 | + | if type (x) == "function" then | |
| 13 | + | x = x (env) | |
| 14 | + | end | |
| 15 | + | return x | |
| 16 | + | end | |
| 17 | + | end | |
| 18 | + | ||
| 19 | + | local function keywords_for (apply) | |
| 20 | + | return function (word_list) | |
| 21 | + | local keywords = {} | |
| 22 | + | for _, word in ipairs (word_list) do | |
| 23 | + | keywords[word] = apply | |
| 24 | + | end | |
| 25 | + | return setmetatable (keywords, {__call = function (t, ...) | |
| 26 | + | return apply(...) | |
| 27 | + | end}) | |
| 28 | + | end | |
| 29 | + | end | |
| 30 | + | ||
| 31 | + | local function default (apply) | |
| 32 | + | return function (operations) | |
| 33 | + | return setmetatable (operations, {__call = function (t, ...) | |
| 34 | + | return apply (...) | |
| 35 | + | end}) | |
| 36 | + | end | |
| 37 | + | end | |
| 38 | + | ||
| 39 | + | local function let (var) | |
| 40 | + | local _let = function (val) | |
| 41 | + | return function (env) | |
| 42 | + | env[force (env) (var)] = force (env) (val) | |
| 43 | + | end | |
| 44 | + | end | |
| 45 | + | return keywords_for (_let) { "equal", "be" } | |
| 46 | + | end | |
| 47 | + | ||
| 48 | + | local function get (var) | |
| 49 | + | return function (env) | |
| 50 | + | return env[force (env) (var)] | |
| 51 | + | end | |
| 52 | + | end | |
| 53 | + | ||
| 54 | + | local function add (x) | |
| 55 | + | local _add = function (y) | |
| 56 | + | return function (env) | |
| 57 | + | return force (env) (x) + force (env) (y) | |
| 58 | + | end | |
| 59 | + | end | |
| 60 | + | return keywords_for (_add) { "to", "with" } | |
| 61 | + | end | |
| 62 | + | ||
| 63 | + | local function show (val) | |
| 64 | + | local _show = function (env) | |
| 65 | + | print (force (env) (val)) | |
| 66 | + | end | |
| 67 | + | ||
| 68 | + | return _show | |
| 69 | + | end | |
| 70 | + | ||
| 71 | + | local function is (a) | |
| 72 | + | local _equals = function (b) | |
| 73 | + | return function (env) | |
| 74 | + | return force (env) (a) == force (env) (b) | |
| 75 | + | end | |
| 76 | + | end | |
| 77 | + | ||
| 78 | + | return default (_equals) { | |
| 79 | + | greater_than = function (b) | |
| 80 | + | return function (env) | |
| 81 | + | return force (env) (a) > force (env) (b) | |
| 82 | + | end | |
| 83 | + | end, | |
| 84 | + | less_than = function (b) | |
| 85 | + | return function (env) | |
| 86 | + | return force (env) (a) < force (env) (b) | |
| 87 | + | end | |
| 88 | + | end, | |
| 89 | + | } | |
| 90 | + | end | |
| 91 | + | ||
| 92 | + | local function when (cond) | |
| 93 | + | local _when = function (when_true) | |
| 94 | + | local _when_false = function (when_false) | |
| 95 | + | return function (env) | |
| 96 | + | if force (env) (cond) then | |
| 97 | + | return eval (when_true, env) | |
| 98 | + | else | |
| 99 | + | return eval (when_false, env) | |
| 100 | + | end | |
| 101 | + | end | |
| 102 | + | end | |
| 103 | + | ||
| 104 | + | return keywords_for (_when_false) { "otherwise" } | |
| 105 | + | end | |
| 106 | + | return _when | |
| 107 | + | end | |
| 108 | + | ||
| 109 | + | local function rand () | |
| 110 | + | return math.random () | |
| 111 | + | end | |
| 112 | + | ||
| 113 | + | local function return_with (value) | |
| 114 | + | return function (env) | |
| 115 | + | return value | |
| 116 | + | end | |
| 117 | + | end | |
| 118 | + | ||
| 119 | + | math.randomseed (os.time ()) | |
| 120 | + | eval { | |
| 121 | + | show ( | |
| 122 | + | when (is (rand) .greater_than (0.5)) { | |
| 123 | + | show "Wow! The value was..." ; | |
| 124 | + | return_with "High :>" ; | |
| 125 | + | } .otherwise { | |
| 126 | + | show "Damn, the value was..." ; | |
| 127 | + | return_with "Low :<" ; | |
| 128 | + | } | |
| 129 | + | ) | |
| 130 | + | } | |
dsl.lua(檔案已創建)
| @@ -0,0 +1,73 @@ | |||
| 1 | + | local function eval (prog) | |
| 2 | + | local env = {} | |
| 3 | + | for _, fn in ipairs (prog) do | |
| 4 | + | fn (env) | |
| 5 | + | end | |
| 6 | + | end | |
| 7 | + | ||
| 8 | + | local function keywords_for (apply) | |
| 9 | + | return function (word_list) | |
| 10 | + | local keywords = {} | |
| 11 | + | for _, word in ipairs (word_list) do | |
| 12 | + | keywords[word] = apply | |
| 13 | + | end | |
| 14 | + | return setmetatable (keywords, {__call = function (t, ...) return apply(...) end}) | |
| 15 | + | end | |
| 16 | + | end | |
| 17 | + | ||
| 18 | + | local function let (var) | |
| 19 | + | local _let = function (val) | |
| 20 | + | return function (env) | |
| 21 | + | if type (val) == "function" then | |
| 22 | + | val = val (env) | |
| 23 | + | end | |
| 24 | + | env[var] = val | |
| 25 | + | end | |
| 26 | + | end | |
| 27 | + | return keywords_for (_let) { "equal", "be" } | |
| 28 | + | end | |
| 29 | + | ||
| 30 | + | local function get (var) | |
| 31 | + | return function (env) | |
| 32 | + | return env[var] | |
| 33 | + | end | |
| 34 | + | end | |
| 35 | + | ||
| 36 | + | local function add (x) | |
| 37 | + | local _add = function (y) | |
| 38 | + | return function (env) | |
| 39 | + | if type (x) == "function" then | |
| 40 | + | x = x (env) | |
| 41 | + | end | |
| 42 | + | ||
| 43 | + | if type (y) == "function" then | |
| 44 | + | y = y (env) | |
| 45 | + | end | |
| 46 | + | if type (y) == "table" then | |
| 47 | + | print (next(y)) | |
| 48 | + | end | |
| 49 | + | return x + y | |
| 50 | + | end | |
| 51 | + | end | |
| 52 | + | return keywords_for (_add) { "to", "with" } | |
| 53 | + | end | |
| 54 | + | ||
| 55 | + | local function show (val) | |
| 56 | + | local _show = function (env) | |
| 57 | + | if type (val) == "function" then | |
| 58 | + | val = val (env) | |
| 59 | + | end | |
| 60 | + | ||
| 61 | + | print (val) | |
| 62 | + | end | |
| 63 | + | ||
| 64 | + | return _show | |
| 65 | + | end | |
| 66 | + | ||
| 67 | + | eval { | |
| 68 | + | let "x" .equal (1) ; | |
| 69 | + | let "y" .be (2) ; | |
| 70 | + | let "z" (3) ; | |
| 71 | + | show (add (get "x") .to (get "y")) ; | |
| 72 | + | show (add (get "y") .with (get "z")) ; | |
| 73 | + | } | |
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