tree.lua
| @@ -62,6 +62,21 @@ local function parse(string) | |||
| 62 | 62 | return build_tree(string:gmatch(".")) | |
| 63 | 63 | end | |
| 64 | 64 | ||
| 65 | + | local objects = {} | |
| 66 | + | objects.Nowhere = { | |
| 67 | + | objects = {}, | |
| 68 | + | create = function(self, stream) | |
| 69 | + | local name = table.concat(stream(), " ") | |
| 70 | + | self.objects[name] = { | |
| 71 | + | lookAt = function(self, stream) | |
| 72 | + | print("You see " .. name) | |
| 73 | + | return self | |
| 74 | + | end | |
| 75 | + | } | |
| 76 | + | return self.objects[name] | |
| 77 | + | end | |
| 78 | + | } | |
| 79 | + | ||
| 65 | 80 | local function reduce(tree) | |
| 66 | 81 | if type(tree) ~= "table" then | |
| 67 | 82 | return tree | |
| @@ -78,6 +93,15 @@ local function reduce(tree) | |||
| 78 | 93 | for node in node_stream do | |
| 79 | 94 | if not target then | |
| 80 | 95 | target = reduce(node) | |
| 96 | + | if objects[target] then | |
| 97 | + | target = objects[target] | |
| 98 | + | end | |
| 99 | + | elseif type(target) == "table" then | |
| 100 | + | if target[node] then | |
| 101 | + | target = target[node](target, node_stream) | |
| 102 | + | else | |
| 103 | + | error("Object does not respond to " .. node) | |
| 104 | + | end | |
| 81 | 105 | elseif type(target) == "number" then | |
| 82 | 106 | local next = reduce(node_stream()) | |
| 83 | 107 | if node == "+" then | |
tree.lua(檔案已創建)
| @@ -0,0 +1,100 @@ | |||
| 1 | + | local function table_stream(t) | |
| 2 | + | return coroutine.wrap(function() | |
| 3 | + | for _, v in ipairs(t) do | |
| 4 | + | coroutine.yield(v) | |
| 5 | + | end | |
| 6 | + | end) | |
| 7 | + | end | |
| 8 | + | ||
| 9 | + | local function push(t, v) | |
| 10 | + | table.insert(t, v) | |
| 11 | + | end | |
| 12 | + | ||
| 13 | + | local function show_tree(tree) | |
| 14 | + | local buffer = {} | |
| 15 | + | for node in table_stream(tree) do | |
| 16 | + | if type(node) == "table" then | |
| 17 | + | local subtree = ("(%s)"):format(show_tree(node)) | |
| 18 | + | push(buffer, subtree) | |
| 19 | + | else | |
| 20 | + | push(buffer, tostring(node)) | |
| 21 | + | end | |
| 22 | + | end | |
| 23 | + | return table.concat(buffer, " ") | |
| 24 | + | end | |
| 25 | + | ||
| 26 | + | ||
| 27 | + | local function build_symbol(bits) | |
| 28 | + | local symbol = table.concat(bits) | |
| 29 | + | if tonumber(symbol) then return tonumber(symbol) | |
| 30 | + | elseif symbol == "true" then return true | |
| 31 | + | elseif symbol == "false" then return false | |
| 32 | + | else return symbol | |
| 33 | + | end | |
| 34 | + | end | |
| 35 | + | ||
| 36 | + | local function build_tree(stream) | |
| 37 | + | local tree = {} | |
| 38 | + | local symbol = {} | |
| 39 | + | for char in stream do | |
| 40 | + | if char == "(" then | |
| 41 | + | push(tree, build_tree(stream)) | |
| 42 | + | elseif char == ")" then | |
| 43 | + | break | |
| 44 | + | elseif char == " " and #symbol ~= 0 then | |
| 45 | + | push(tree, build_symbol(symbol)) | |
| 46 | + | symbol = {} | |
| 47 | + | elseif char:match("%s") then | |
| 48 | + | -- no op | |
| 49 | + | else | |
| 50 | + | push(symbol, char) | |
| 51 | + | end | |
| 52 | + | end | |
| 53 | + | ||
| 54 | + | if #symbol ~= 0 then | |
| 55 | + | push(tree, build_symbol(symbol)) | |
| 56 | + | end | |
| 57 | + | ||
| 58 | + | return tree | |
| 59 | + | end | |
| 60 | + | ||
| 61 | + | local function parse(string) | |
| 62 | + | return build_tree(string:gmatch(".")) | |
| 63 | + | end | |
| 64 | + | ||
| 65 | + | local function reduce(tree) | |
| 66 | + | if type(tree) ~= "table" then | |
| 67 | + | return tree | |
| 68 | + | end | |
| 69 | + | ||
| 70 | + | local index = 1 | |
| 71 | + | local target = nil | |
| 72 | + | local node_stream = coroutine.wrap(function() | |
| 73 | + | for _, node in ipairs(tree) do | |
| 74 | + | coroutine.yield(node) | |
| 75 | + | end | |
| 76 | + | end) | |
| 77 | + | ||
| 78 | + | for node in node_stream do | |
| 79 | + | if not target then | |
| 80 | + | target = reduce(node) | |
| 81 | + | elseif type(target) == "number" then | |
| 82 | + | local next = reduce(node_stream()) | |
| 83 | + | if node == "+" then | |
| 84 | + | target = target + next | |
| 85 | + | elseif node == "-" then | |
| 86 | + | target = target - next | |
| 87 | + | elseif node == "*" then | |
| 88 | + | target = target * next | |
| 89 | + | elseif node == "/" then | |
| 90 | + | target = target / next | |
| 91 | + | else | |
| 92 | + | error("Object does not respond to " .. node) | |
| 93 | + | end | |
| 94 | + | end | |
| 95 | + | end | |
| 96 | + | return target | |
| 97 | + | end | |
| 98 | + | ||
| 99 | + | print(show_tree(parse(arg[1]))) | |
| 100 | + | print(reduce(parse(arg[1]))) | |
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