add /apps/demos/crawl

apps/demos/crawl/data/levels/00.lvl

@@ -0,0 +1,24 @@
+@map
+-- Grid of entities defined by @classes.
+#####
+#.@.#
+#...#
+##.##
+#...#
+#...#
+#####
+
+
+@classes
+-- Defines classes under symbols, which could have properties.
+# wall
+. void
+  test : this
+@ player_spawn
+  unique :
+  face : south
+  hold : torch
+
+@meta
+-- Arbitrary sections could be defined with values pairs.
+description : Test Level! Just two square rooms.

apps/demos/crawl/data/scripts/game.lua

@@ -0,0 +1,83 @@
+require("string")
+
+function load_level(file)
+    local f = file_read { file = file }
+
+    local result = {
+        classes = {},
+        glossary = {},
+        grid = {},
+        map = {},
+    }
+
+    -- iterate over lines
+    local section, subsection = "none", "none"
+    local from = 1
+    local start, limit = string.find(f, "\n", from)
+    while start do
+        local line = string.sub(f, from, start - 1)
+        -- skip over
+        if #line == 0 or line:find("^%-%-%s*") then
+            goto skip
+        -- start new section
+        elseif line:find("^@%a+") then
+            section = line:sub(2); subsection = "none"
+        -- decode map one line at a time
+        elseif section == "map" then
+            local l = #result.map + 1
+            result.map[l] = {}
+            for i = 1, #line do
+                result.map[l][i] = line:sub(i,i)
+            end
+            assert(#result.map[1] == #result.map[l])
+        -- templates to expand
+        elseif section == "classes" then
+            -- properties
+            if line:find("^  %a+") then
+                local _, _, property, value = line:find("^  (%a+)%s?:%s?(.*)")
+                result.classes[subsection][property] = value
+                goto skip
+            end
+            local symbol, classname = line:sub(1,1), line:sub(3)
+            result.classes[classname] = {
+                symbol = symbol,
+            }
+            result.glossary[symbol] = classname
+            subsection = classname
+        elseif section ~= "none" then
+            local _, _, property, value = line:find("^(%a+)%s?:%s?(.*)")
+            if result[section] == nil then
+                result[section] = {}
+            end
+            result[section][property] = value
+        end
+        ::skip::
+        from = limit + 1
+        start, limit = string.find(f, "\n", from)
+    end
+    -- post process
+    for y = 1, #result.map do
+        result.grid[y] = {}
+        for x = 1, #result.map[y] do
+            local class = result.classes[result.glossary[result.map[y][x]]]
+            if class["unique"] ~= nil then
+                class.position = { x = x, y = y }
+            end
+            result.grid[y][x] = class
+        end
+    end
+
+    print(result.meta.description)
+
+    return result
+end
+
+
+function game_tick()
+    if ctx.udata == nil then
+        ctx.udata = {
+            level = load_level("levels/00.lvl")
+        }
+        log_vec2 { value = ctx.udata.level.classes.player_spawn.position }
+    end
+end

apps/demos/crawl/data/twn.toml

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+# This file contains everything about the engine and your game that can be
+# configured before it runs.
+#
+# Optional settings are commented out, with their default values shown.
+# Invalid values in these settings will be ignored.
+
+# Data about your game as an application
+[about]
+title = "Template"
+developer = "You"
+app_id = "template"
+dev_id = "you"
+
+# Game runtime details
+[game]
+resolution = [ 640, 480 ]
+interpreter = "$TWNROOT/apps/twnlua"
+#debug = true
+
+# Engine tweaks. You probably don't need to change these
+[engine]
+#ticks_per_second = 60 # minimum of 8
+#keybind_slots = 3 # minimum of 1
+#texture_atlas_size = 2048 # minimum of 32
+#font_texture_size = 2048 # minimum of 1024
+#font_oversampling = 4 # minimum of 0
+#font_filtering = "linear" # possible values: "nearest", "linear"