From 4c6b7bb0f17fca0700550dc88042ac1cb1eb28df Mon Sep 17 00:00:00 2001 From: Christian Struck Date: Fri, 13 Sep 2013 12:23:38 +0200 Subject: Added Sample BVG-info-beamer node --- scripts/info-beamer/README | 7 + scripts/info-beamer/json.lua | 376 +++++++++++++++++++++++++++++++++++++ scripts/info-beamer/light.ttf | Bin 0 -> 191032 bytes scripts/info-beamer/node.lua | 61 ++++++ scripts/info-beamer/whitepixel.png | Bin 0 -> 150 bytes 5 files changed, 444 insertions(+) create mode 100644 scripts/info-beamer/README create mode 100644 scripts/info-beamer/json.lua create mode 100644 scripts/info-beamer/light.ttf create mode 100644 scripts/info-beamer/node.lua create mode 100644 scripts/info-beamer/whitepixel.png (limited to 'scripts') diff --git a/scripts/info-beamer/README b/scripts/info-beamer/README new file mode 100644 index 0000000..b6b70fd --- /dev/null +++ b/scripts/info-beamer/README @@ -0,0 +1,7 @@ +Create a crontab entry with: + +*/1 * * * * --vehicle U BUS --limit 10 "U Ernst-Reuter-Platz (Berlin)" 2> /dev/null + +and save the file in your info-beamer node folder. + +in the example node.lua the filename is ERP, it should be changed to the filename used. diff --git a/scripts/info-beamer/json.lua b/scripts/info-beamer/json.lua new file mode 100644 index 0000000..ab915be --- /dev/null +++ b/scripts/info-beamer/json.lua @@ -0,0 +1,376 @@ +----------------------------------------------------------------------------- +-- JSON4Lua: JSON encoding / decoding support for the Lua language. +-- json Module. +-- Author: Craig Mason-Jones +-- Homepage: http://json.luaforge.net/ +-- Version: 0.9.40 +-- This module is released under the MIT License (MIT). +-- Please see LICENCE.txt for details. +-- +-- USAGE: +-- This module exposes two functions: +-- encode(o) +-- Returns the table / string / boolean / number / nil / json.null value as a JSON-encoded string. +-- decode(json_string) +-- Returns a Lua object populated with the data encoded in the JSON string json_string. +-- +-- REQUIREMENTS: +-- compat-5.1 if using Lua 5.0 +-- +-- CHANGELOG +-- 0.9.20 Introduction of local Lua functions for private functions (removed _ function prefix). +-- Fixed Lua 5.1 compatibility issues. +-- Introduced json.null to have null values in associative arrays. +-- encode() performance improvement (more than 50%) through table.concat rather than .. +-- Introduced decode ability to ignore /**/ comments in the JSON string. +-- 0.9.10 Fix to array encoding / decoding to correctly manage nil/null values in arrays. +----------------------------------------------------------------------------- + +----------------------------------------------------------------------------- +-- Imports and dependencies +----------------------------------------------------------------------------- +local math = require('math') +local string = require("string") +local table = require("table") + +local base = _G + +----------------------------------------------------------------------------- +-- Module declaration +----------------------------------------------------------------------------- +module("json") + +-- Public functions + +-- Private functions +local decode_scanArray +local decode_scanComment +local decode_scanConstant +local decode_scanNumber +local decode_scanObject +local decode_scanString +local decode_scanWhitespace +local encodeString +local isArray +local isEncodable + +----------------------------------------------------------------------------- +-- PUBLIC FUNCTIONS +----------------------------------------------------------------------------- +--- Encodes an arbitrary Lua object / variable. +-- @param v The Lua object / variable to be JSON encoded. +-- @return String containing the JSON encoding in internal Lua string format (i.e. not unicode) +function encode (v) + -- Handle nil values + if v==nil then + return "null" + end + + local vtype = base.type(v) + + -- Handle strings + if vtype=='string' then + return '"' .. encodeString(v) .. '"' -- Need to handle encoding in string + end + + -- Handle booleans + if vtype=='number' or vtype=='boolean' then + return base.tostring(v) + end + + -- Handle tables + if vtype=='table' then + local rval = {} + -- Consider arrays separately + local bArray, maxCount = isArray(v) + if bArray then + for i = 1,maxCount do + table.insert(rval, encode(v[i])) + end + else -- An object, not an array + for i,j in base.pairs(v) do + if isEncodable(i) and isEncodable(j) then + table.insert(rval, '"' .. encodeString(i) .. '":' .. encode(j)) + end + end + end + if bArray then + return '[' .. table.concat(rval,',') ..']' + else + return '{' .. table.concat(rval,',') .. '}' + end + end + + -- Handle null values + if vtype=='function' and v==null then + return 'null' + end + + base.assert(false,'encode attempt to encode unsupported type ' .. vtype .. ':' .. base.tostring(v)) +end + + +--- Decodes a JSON string and returns the decoded value as a Lua data structure / value. +-- @param s The string to scan. +-- @param [startPos] Optional starting position where the JSON string is located. Defaults to 1. +-- @param Lua object, number The object that was scanned, as a Lua table / string / number / boolean or nil, +-- and the position of the first character after +-- the scanned JSON object. +function decode(s, startPos) + startPos = startPos and startPos or 1 + startPos = decode_scanWhitespace(s,startPos) + base.assert(startPos<=string.len(s), 'Unterminated JSON encoded object found at position in [' .. s .. ']') + local curChar = string.sub(s,startPos,startPos) + -- Object + if curChar=='{' then + return decode_scanObject(s,startPos) + end + -- Array + if curChar=='[' then + return decode_scanArray(s,startPos) + end + -- Number + if string.find("+-0123456789.e", curChar, 1, true) then + return decode_scanNumber(s,startPos) + end + -- String + if curChar==[["]] or curChar==[[']] then + return decode_scanString(s,startPos) + end + if string.sub(s,startPos,startPos+1)=='/*' then + return decode(s, decode_scanComment(s,startPos)) + end + -- Otherwise, it must be a constant + return decode_scanConstant(s,startPos) +end + +--- The null function allows one to specify a null value in an associative array (which is otherwise +-- discarded if you set the value with 'nil' in Lua. Simply set t = { first=json.null } +function null() + return null -- so json.null() will also return null ;-) +end +----------------------------------------------------------------------------- +-- Internal, PRIVATE functions. +-- Following a Python-like convention, I have prefixed all these 'PRIVATE' +-- functions with an underscore. +----------------------------------------------------------------------------- + +--- Scans an array from JSON into a Lua object +-- startPos begins at the start of the array. +-- Returns the array and the next starting position +-- @param s The string being scanned. +-- @param startPos The starting position for the scan. +-- @return table, int The scanned array as a table, and the position of the next character to scan. +function decode_scanArray(s,startPos) + local array = {} -- The return value + local stringLen = string.len(s) + base.assert(string.sub(s,startPos,startPos)=='[','decode_scanArray called but array does not start at position ' .. startPos .. ' in string:\n'..s ) + startPos = startPos + 1 + -- Infinite loop for array elements + repeat + startPos = decode_scanWhitespace(s,startPos) + base.assert(startPos<=stringLen,'JSON String ended unexpectedly scanning array.') + local curChar = string.sub(s,startPos,startPos) + if (curChar==']') then + return array, startPos+1 + end + if (curChar==',') then + startPos = decode_scanWhitespace(s,startPos+1) + end + base.assert(startPos<=stringLen, 'JSON String ended unexpectedly scanning array.') + object, startPos = decode(s,startPos) + table.insert(array,object) + until false +end + +--- Scans a comment and discards the comment. +-- Returns the position of the next character following the comment. +-- @param string s The JSON string to scan. +-- @param int startPos The starting position of the comment +function decode_scanComment(s, startPos) + base.assert( string.sub(s,startPos,startPos+1)=='/*', "decode_scanComment called but comment does not start at position " .. startPos) + local endPos = string.find(s,'*/',startPos+2) + base.assert(endPos~=nil, "Unterminated comment in string at " .. startPos) + return endPos+2 +end + +--- Scans for given constants: true, false or null +-- Returns the appropriate Lua type, and the position of the next character to read. +-- @param s The string being scanned. +-- @param startPos The position in the string at which to start scanning. +-- @return object, int The object (true, false or nil) and the position at which the next character should be +-- scanned. +function decode_scanConstant(s, startPos) + local consts = { ["true"] = true, ["false"] = false, ["null"] = nil } + local constNames = {"true","false","null"} + + for i,k in base.pairs(constNames) do + --print ("[" .. string.sub(s,startPos, startPos + string.len(k) -1) .."]", k) + if string.sub(s,startPos, startPos + string.len(k) -1 )==k then + return consts[k], startPos + string.len(k) + end + end + base.assert(nil, 'Failed to scan constant from string ' .. s .. ' at starting position ' .. startPos) +end + +--- Scans a number from the JSON encoded string. +-- (in fact, also is able to scan numeric +- eqns, which is not +-- in the JSON spec.) +-- Returns the number, and the position of the next character +-- after the number. +-- @param s The string being scanned. +-- @param startPos The position at which to start scanning. +-- @return number, int The extracted number and the position of the next character to scan. +function decode_scanNumber(s,startPos) + local endPos = startPos+1 + local stringLen = string.len(s) + local acceptableChars = "+-0123456789.e" + while (string.find(acceptableChars, string.sub(s,endPos,endPos), 1, true) +and endPos<=stringLen +) do + endPos = endPos + 1 + end + local stringValue = 'return ' .. string.sub(s,startPos, endPos-1) + local stringEval = base.loadstring(stringValue) + base.assert(stringEval, 'Failed to scan number [ ' .. stringValue .. '] in JSON string at position ' .. startPos .. ' : ' .. endPos) + return stringEval(), endPos +end + +--- Scans a JSON object into a Lua object. +-- startPos begins at the start of the object. +-- Returns the object and the next starting position. +-- @param s The string being scanned. +-- @param startPos The starting position of the scan. +-- @return table, int The scanned object as a table and the position of the next character to scan. +function decode_scanObject(s,startPos) + local object = {} + local stringLen = string.len(s) + local key, value + base.assert(string.sub(s,startPos,startPos)=='{','decode_scanObject called but object does not start at position ' .. startPos .. ' in string:\n' .. s) + startPos = startPos + 1 + repeat + startPos = decode_scanWhitespace(s,startPos) + base.assert(startPos<=stringLen, 'JSON string ended unexpectedly while scanning object.') + local curChar = string.sub(s,startPos,startPos) + if (curChar=='}') then + return object,startPos+1 + end + if (curChar==',') then + startPos = decode_scanWhitespace(s,startPos+1) + end + base.assert(startPos<=stringLen, 'JSON string ended unexpectedly scanning object.') + -- Scan the key + key, startPos = decode(s,startPos) + base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key) + startPos = decode_scanWhitespace(s,startPos) + base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key) + base.assert(string.sub(s,startPos,startPos)==':','JSON object key-value assignment mal-formed at ' .. startPos) + startPos = decode_scanWhitespace(s,startPos+1) + base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key) + value, startPos = decode(s,startPos) + object[key]=value + until false -- infinite loop while key-value pairs are found +end + +--- Scans a JSON string from the opening inverted comma or single quote to the +-- end of the string. +-- Returns the string extracted as a Lua string, +-- and the position of the next non-string character +-- (after the closing inverted comma or single quote). +-- @param s The string being scanned. +-- @param startPos The starting position of the scan. +-- @return string, int The extracted string as a Lua string, and the next character to parse. +function decode_scanString(s,startPos) + base.assert(startPos, 'decode_scanString(..) called without start position') + local startChar = string.sub(s,startPos,startPos) + base.assert(startChar==[[']] or startChar==[["]],'decode_scanString called for a non-string') + local escaped = false + local endPos = startPos + 1 + local bEnded = false + local stringLen = string.len(s) + repeat + local curChar = string.sub(s,endPos,endPos) + -- Character escaping is only used to escape the string delimiters + if not escaped then + if curChar==[[\]] then + escaped = true + else + bEnded = curChar==startChar + end + else + -- If we're escaped, we accept the current character come what may + escaped = false + end + endPos = endPos + 1 + base.assert(endPos <= stringLen+1, "String decoding failed: unterminated string at position " .. endPos) + until bEnded + local stringValue = 'return ' .. string.sub(s, startPos, endPos-1) + local stringEval = base.loadstring(stringValue) + base.assert(stringEval, 'Failed to load string [ ' .. stringValue .. '] in JSON4Lua.decode_scanString at position ' .. startPos .. ' : ' .. endPos) + return stringEval(), endPos +end + +--- Scans a JSON string skipping all whitespace from the current start position. +-- Returns the position of the first non-whitespace character, or nil if the whole end of string is reached. +-- @param s The string being scanned +-- @param startPos The starting position where we should begin removing whitespace. +-- @return int The first position where non-whitespace was encountered, or string.len(s)+1 if the end of string +-- was reached. +function decode_scanWhitespace(s,startPos) + local whitespace=" \n\r\t" + local stringLen = string.len(s) + while ( string.find(whitespace, string.sub(s,startPos,startPos), 1, true) and startPos <= stringLen) do + startPos = startPos + 1 + end + return startPos +end + +--- Encodes a string to be JSON-compatible. +-- This just involves back-quoting inverted commas, back-quotes and newlines, I think ;-) +-- @param s The string to return as a JSON encoded (i.e. backquoted string) +-- @return The string appropriately escaped. +function encodeString(s) + s = string.gsub(s,'\\','\\\\') + s = string.gsub(s,'"','\\"') + s = string.gsub(s,"'","\\'") + s = string.gsub(s,'\n','\\n') + s = string.gsub(s,'\t','\\t') + return s +end + +-- Determines whether the given Lua type is an array or a table / dictionary. +-- We consider any table an array if it has indexes 1..n for its n items, and no +-- other data in the table. +-- I think this method is currently a little 'flaky', but can't think of a good way around it yet... +-- @param t The table to evaluate as an array +-- @return boolean, number True if the table can be represented as an array, false otherwise. If true, +-- the second returned value is the maximum +-- number of indexed elements in the array. +function isArray(t) + -- Next we count all the elements, ensuring that any non-indexed elements are not-encodable + -- (with the possible exception of 'n') + local maxIndex = 0 + for k,v in base.pairs(t) do + if (base.type(k)=='number' and math.floor(k)==k and 1<=k) then -- k,v is an indexed pair + if (not isEncodable(v)) then return false end -- All array elements must be encodable + maxIndex = math.max(maxIndex,k) + else + if (k=='n') then + if v ~= table.getn(t) then return false end -- False if n does not hold the number of elements + else -- Else of (k=='n') + if isEncodable(v) then return false end + end -- End of (k~='n') + end -- End of k,v not an indexed pair + end -- End of loop across all pairs + return true, maxIndex +end + +--- Determines whether the given Lua object / table / variable can be JSON encoded. The only +-- types that are JSON encodable are: string, boolean, number, nil, table and json.null. +-- In this implementation, all other types are ignored. +-- @param o The object to examine. +-- @return boolean True if the object should be JSON encoded, false if it should be ignored. +function isEncodable(o) + local t = base.type(o) + return (t=='string' or t=='boolean' or t=='number' or t=='nil' or t=='table') or (t=='function' and o==null) +end diff --git a/scripts/info-beamer/light.ttf b/scripts/info-beamer/light.ttf new file mode 100644 index 0000000..7ac04b6 Binary files /dev/null and b/scripts/info-beamer/light.ttf differ diff --git a/scripts/info-beamer/node.lua b/scripts/info-beamer/node.lua new file mode 100644 index 0000000..c062dc0 --- /dev/null +++ b/scripts/info-beamer/node.lua @@ -0,0 +1,61 @@ +gl.setup(1680, 945) +json = require("json") +font = resource.load_font("light.ttf") +font2 = resource.load_font("light.ttf") +background = resource.load_image("whitepixel.png") + +maxCharWidth = WIDTH/0.6 +color = { r = 0.95, g = 0.95, b = 0.0 } +charSize = 82 + +function alignRight(num) + -- 0 1 2 3 4 5 6 7 8 9 + local width = { 5, 30, 7, 5, 7, 15, 8, 5, 5, 5 } + local num1 = num % 10; + local num2 = math.floor(num / 10 % 10); + + if num2 >= 1 then + return width[num1 + 1] + width[num2 + 1] + else + return width[num1 + 1] + 44 + end +end + +function node.render() + local i = 0 + local station_json = json.decode(text) + background:draw(0, 0, WIDTH, HEIGHT/10) + background:draw(0, HEIGHT - HEIGHT/10, WIDTH, HEIGHT) + for k, stations in pairs(station_json) do + local station = stations[1] + width = math.floor(maxCharWidth/72/2 + string.len(station)/2) + font2:write(15, HEIGHT - charSize, station:gsub(" %(Berlin%)", ""), 72, 0,0,0, 1) + font2:write(15, 30, "Line Destination Departure", 64, 0,0,0,1) + i = i + 124 + j = 0 + for k, departures in pairs(stations[2]) do + local remaining = math.floor(departures['remaining']/60) + if remaining >= 5 and j < 8 then + j = j + 1 + local timeString = string.format('%2d min', remaining) + font:write(WIDTH-440 + alignRight(remaining), i, + string.format('%14s', timeString), + charSize, color.r, color.g, color.b, 1) + font:write(0, i, + string.format(' %-5s', + departures['line']:gsub("Bus ", "")), + charSize, color.r, color.g, color.b, 1) + font:write(250, i, + string.format(' %-32s', + departures['end']:gsub("-", '—'):gsub('%(Berlin%)', '')), + charSize, color.r, color.g, color.b, 1) + i = i + charSize + 10 + end + end + end +end + +util.file_watch("ERP", function(content) + text = content +end) + diff --git a/scripts/info-beamer/whitepixel.png b/scripts/info-beamer/whitepixel.png new file mode 100644 index 0000000..fda31f6 Binary files /dev/null and b/scripts/info-beamer/whitepixel.png differ -- cgit v1.2.3