Initial

main.lua

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+local Height = 0
+local Width = 0
+
+local myMath = require("modules.math")
+local myTypes = require("modules.types")
+local conductor = require("modules.conductor")
+local json = require("modules.json")
+local files = require("modules.files")
+local socket = require("socket")
+
+local newVector2 = myTypes.Vector2(10, 10)
+
+local startTime = socket.gettime()
+
+local songName = "high"
+local songDifficulty = "erect"
+
+local chartString = files.read_file(string.format("charts/%s/%s-%s.json", songName, songName, songDifficulty))
+
+print(chartString)
+local chart = json.parse(chartString).song
+
+local inst = love.audio.newSource(string.format("songs/%s/Inst.ogg", chart.song), "stream")
+local voices = love.audio.newSource(string.format("songs/%s/Voices.ogg", chart.song), "stream")
+
+conductor:setBpm(chart.bpm)
+conductor:mapBpmChanges(chart)
+
+inst:play()
+voices:play()
+
+local step = 0
+local beat = 0
+
+
+function love.draw()
+    local currentTime = socket.gettime()
+    local elapsed = math.floor((currentTime - startTime) * 1000)
+
+    local oldStep = step
+    local oldBeat = beat
+
+    step = conductor:getStepRounded(elapsed)
+    beat = conductor:getBeatRounded(elapsed)
+
+    if step ~= oldStep then
+        print("Step", step)
+    end
+
+    if beat ~= oldBeat then
+        print("Beat", beat)
+    end
+end

modules/conductor.lua

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+local myMath = require("modules.math")
+local logging = require("modules.logging")
+
+local conductor = {}
+conductor.bpm = 120
+conductor.crochet = 1000
+conductor.stepCrochet = conductor.crochet/4
+conductor.songPosition = 0
+
+conductor.bpmChangeMap = {}
+
+function conductor:getBPMFromSeconds(time)
+    local lastChange = {
+        stepTime = 0,
+        songTime = 0,
+        bpm = self.bpm,
+        stepCrochet = self.stepCrochet
+    }
+
+    for _, change in next, self.bpmChangeMap do
+        if change.songTime > lastChange.songTime then
+            lastChange = change
+        end
+    end
+
+    return lastChange
+end
+
+function conductor:calculateCrochet(bpm)
+    return (60/bpm) * 1000
+end
+
+function conductor:setBpm(newBpm)
+    self.bpm = newBpm
+    self.crochet = self:calculateCrochet(newBpm)
+    self.stepCrochet = self.crochet / 4
+end
+
+function conductor:getStep(time)
+    local lastChange = self:getBPMFromSeconds(time)
+
+    return lastChange.stepTime + (time - lastChange.songTime) / lastChange.stepCrochet
+end
+
+function conductor:getStepRounded(time)
+    local lastChange = self:getBPMFromSeconds(time)
+
+    return math.floor(lastChange.stepTime + math.floor(time - lastChange.songTime) / lastChange.stepCrochet)
+end
+
+function conductor:getBeat(time)
+    return self:getStep(time) / 4
+end
+
+function conductor:getBeatRounded(time)
+    return math.floor(self:getStep(time) / 4)
+end
+
+function conductor:getSectionBeats(song, section)
+    local beats = nil
+    if song["notes"][section] then
+        beats = song["notes"][section]["sectionBeats"]
+    end
+    return beats or 4
+end
+
+function conductor:mapBpmChanges(song)
+    print(logging.dump(song))
+
+    local curBPM = song["bpm"]
+    local totalSteps = 0
+    local totalPos = 0
+
+
+
+    for index, section in next, song["notes"] do
+        if section["changeBPM"] then
+            curBPM = section["bpm"]
+
+            local change = {
+                stepTime = totalSteps,
+                songTime = totalPos,
+                bpm = curBPM,
+                stepCrochet = self:calculateCrochet(curBPM)/4
+            }
+
+            table.insert(self.bpmChangeMap, change)
+        end
+
+        local deltaSteps = myMath.round(self:getSectionBeats(song, index) * 4)
+        totalSteps = totalSteps + deltaSteps
+        totalPos = (totalPos + (60/curBPM) * 1000 / 4) * deltaSteps
+    end
+
+    print("Mapped the song BPM changes.")
+end
+
+return conductor

modules/files.lua

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+local files = {}
+
+local open = io.open
+
+function files.read_file(path)
+    local file = open(path, "rb") -- r read mode and b binary mode
+    if not file then return nil end
+    local content = file:read "*a" -- *a or *all reads the whole file
+    file:close()
+    return content
+end
+
+return files

modules/json.lua

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+--[[ json.lua
+
+A compact pure-Lua JSON library.
+The main functions are: json.stringify, json.parse.
+
+## json.stringify:
+
+This expects the following to be true of any tables being encoded:
+ * They only have string or number keys. Number keys must be represented as
+   strings in json; this is part of the json spec.
+ * They are not recursive. Such a structure cannot be specified in json.
+
+A Lua table is considered to be an array if and only if its set of keys is a
+consecutive sequence of positive integers starting at 1. Arrays are encoded like
+so: `[2, 3, false, "hi"]`. Any other type of Lua table is encoded as a json
+object, encoded like so: `{"key1": 2, "key2": false}`.
+
+Because the Lua nil value cannot be a key, and as a table value is considerd
+equivalent to a missing key, there is no way to express the json "null" value in
+a Lua table. The only way this will output "null" is if your entire input obj is
+nil itself.
+
+An empty Lua table, {}, could be considered either a json object or array -
+it's an ambiguous edge case. We choose to treat this as an object as it is the
+more general type.
+
+To be clear, none of the above considerations is a limitation of this code.
+Rather, it is what we get when we completely observe the json specification for
+as arbitrary a Lua object as json is capable of expressing.
+
+## json.parse:
+
+This function parses json, with the exception that it does not pay attention to
+\u-escaped unicode code points in strings.
+
+It is difficult for Lua to return null as a value. In order to prevent the loss
+of keys with a null value in a json string, this function uses the one-off
+table value json.null (which is just an empty table) to indicate null values.
+This way you can check if a value is null with the conditional
+`val == json.null`.
+
+If you have control over the data and are using Lua, I would recommend just
+avoiding null values in your data to begin with.
+
+--]]
+
+
+local json = {}
+
+
+-- Internal functions.
+
+local function kind_of(obj)
+  if type(obj) ~= 'table' then return type(obj) end
+  local i = 1
+  for _ in pairs(obj) do
+    if obj[i] ~= nil then i = i + 1 else return 'table' end
+  end
+  if i == 1 then return 'table' else return 'array' end
+end
+
+local function escape_str(s)
+  local in_char  = {'\\', '"', '/', '\b', '\f', '\n', '\r', '\t'}
+  local out_char = {'\\', '"', '/',  'b',  'f',  'n',  'r',  't'}
+  for i, c in ipairs(in_char) do
+    s = s:gsub(c, '\\' .. out_char[i])
+  end
+  return s
+end
+
+-- Returns pos, did_find; there are two cases:
+-- 1. Delimiter found: pos = pos after leading space + delim; did_find = true.
+-- 2. Delimiter not found: pos = pos after leading space;     did_find = false.
+-- This throws an error if err_if_missing is true and the delim is not found.
+local function skip_delim(str, pos, delim, err_if_missing)
+  pos = pos + #str:match('^%s*', pos)
+  if str:sub(pos, pos) ~= delim then
+    if err_if_missing then
+      error('Expected ' .. delim .. ' near position ' .. pos)
+    end
+    return pos, false
+  end
+  return pos + 1, true
+end
+
+-- Expects the given pos to be the first character after the opening quote.
+-- Returns val, pos; the returned pos is after the closing quote character.
+local function parse_str_val(str, pos, val)
+  val = val or ''
+  local early_end_error = 'End of input found while parsing string.'
+  if pos > #str then error(early_end_error) end
+  local c = str:sub(pos, pos)
+  if c == '"'  then return val, pos + 1 end
+  if c ~= '\\' then return parse_str_val(str, pos + 1, val .. c) end
+  -- We must have a \ character.
+  local esc_map = {b = '\b', f = '\f', n = '\n', r = '\r', t = '\t'}
+  local nextc = str:sub(pos + 1, pos + 1)
+  if not nextc then error(early_end_error) end
+  return parse_str_val(str, pos + 2, val .. (esc_map[nextc] or nextc))
+end
+
+-- Returns val, pos; the returned pos is after the number's final character.
+local function parse_num_val(str, pos)
+  local num_str = str:match('^-?%d+%.?%d*[eE]?[+-]?%d*', pos)
+  local val = tonumber(num_str)
+  if not val then error('Error parsing number at position ' .. pos .. '.') end
+  return val, pos + #num_str
+end
+
+
+-- Public values and functions.
+
+function json.stringify(obj, as_key)
+  local s = {}  -- We'll build the string as an array of strings to be concatenated.
+  local kind = kind_of(obj)  -- This is 'array' if it's an array or type(obj) otherwise.
+  if kind == 'array' then
+    if as_key then error('Can\'t encode array as key.') end
+    s[#s + 1] = '['
+    for i, val in ipairs(obj) do
+      if i > 1 then s[#s + 1] = ', ' end
+      s[#s + 1] = json.stringify(val)
+    end
+    s[#s + 1] = ']'
+  elseif kind == 'table' then
+    if as_key then error('Can\'t encode table as key.') end
+    s[#s + 1] = '{'
+    for k, v in pairs(obj) do
+      if #s > 1 then s[#s + 1] = ', ' end
+      s[#s + 1] = json.stringify(k, true)
+      s[#s + 1] = ':'
+      s[#s + 1] = json.stringify(v)
+    end
+    s[#s + 1] = '}'
+  elseif kind == 'string' then
+    return '"' .. escape_str(obj) .. '"'
+  elseif kind == 'number' then
+    if as_key then return '"' .. tostring(obj) .. '"' end
+    return tostring(obj)
+  elseif kind == 'boolean' then
+    return tostring(obj)
+  elseif kind == 'nil' then
+    return 'null'
+  else
+    error('Unjsonifiable type: ' .. kind .. '.')
+  end
+  return table.concat(s)
+end
+
+json.null = {}  -- This is a one-off table to represent the null value.
+
+function json.parse(str, pos, end_delim)
+  pos = pos or 1
+  if pos > #str then error('Reached unexpected end of input.') end
+  local pos = pos + #str:match('^%s*', pos)  -- Skip whitespace.
+  local first = str:sub(pos, pos)
+  if first == '{' then  -- Parse an object.
+    local obj, key, delim_found = {}, true, true
+    pos = pos + 1
+    while true do
+      key, pos = json.parse(str, pos, '}')
+      if key == nil then return obj, pos end
+      if not delim_found then error('Comma missing between object items.') end
+      pos = skip_delim(str, pos, ':', true)  -- true -> error if missing.
+      obj[key], pos = json.parse(str, pos)
+      pos, delim_found = skip_delim(str, pos, ',')
+    end
+  elseif first == '[' then  -- Parse an array.
+    local arr, val, delim_found = {}, true, true
+    pos = pos + 1
+    while true do
+      val, pos = json.parse(str, pos, ']')
+      if val == nil then return arr, pos end
+      if not delim_found then error('Comma missing between array items.') end
+      arr[#arr + 1] = val
+      pos, delim_found = skip_delim(str, pos, ',')
+    end
+  elseif first == '"' then  -- Parse a string.
+    return parse_str_val(str, pos + 1)
+  elseif first == '-' or first:match('%d') then  -- Parse a number.
+    return parse_num_val(str, pos)
+  elseif first == end_delim then  -- End of an object or array.
+    return nil, pos + 1
+  else  -- Parse true, false, or null.
+    local literals = {['true'] = true, ['false'] = false, ['null'] = json.null}
+    for lit_str, lit_val in pairs(literals) do
+      local lit_end = pos + #lit_str - 1
+      if str:sub(pos, lit_end) == lit_str then return lit_val, lit_end + 1 end
+    end
+    local pos_info_str = 'position ' .. pos .. ': ' .. str:sub(pos, pos + 10)
+    error('Invalid json syntax starting at ' .. pos_info_str)
+  end
+end
+
+return json

modules/logging.lua

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+local logging = {}
+
+function logging.dump(o)
+   if type(o) == 'table' then
+      local s = '{ '
+      for k,v in pairs(o) do
+         if type(k) ~= 'number' then k = '"'..k..'"' end
+         s = s .. '['..k..'] = ' .. logging.dump(v) .. ','
+      end
+      return s .. '} '
+   else
+      return tostring(o)
+   end
+end
+
+return logging

modules/math.lua

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+local module = {}
+
+function module.lerp(a, b,c)
+    return a + (b - a) * c
+end
+
+function module.round(a)
+    return math.floor(a + .5)
+end
+
+return module

modules/types.lua

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+local module = {}
+
+local myMath = require("modules.math")
+
+local Vector2 = {}
+Vector2.__index = Vector2
+
+function Vector2:Lerp(newVector2, position)
+    return module.Vector2(myMath.lerp(self.x, newVector2.x, position), myMath.lerp(self.x, newVector2.x, position))
+end
+
+function Vector2:Get()
+    return self.x, self.y
+end
+
+function module.Vector2(x, y)
+    return setmetatable({x = x, y = y}, Vector2)
+end
+
+return module