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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| ALIAS/System/Programs/Settings.program/ |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,340 +1 @@ | ||
| local base = _G | ||
|
|
||
| ----------------------------------------------------------------------------- | ||
| -- Module declaration | ||
| ----------------------------------------------------------------------------- | ||
|
|
||
| -- 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 | ||
|
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||
|
|
||
| --- 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 | ||
| ALIAS/System/APIs/JSON.lua |
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