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Diffstat (limited to 'Data/DefaultContent/Libraries/json4lua/json/json.lua')
| -rw-r--r-- | Data/DefaultContent/Libraries/json4lua/json/json.lua | 427 |
1 files changed, 0 insertions, 427 deletions
diff --git a/Data/DefaultContent/Libraries/json4lua/json/json.lua b/Data/DefaultContent/Libraries/json4lua/json/json.lua deleted file mode 100644 index 79761b6..0000000 --- a/Data/DefaultContent/Libraries/json4lua/json/json.lua +++ /dev/null @@ -1,427 +0,0 @@ ------------------------------------------------------------------------------
--- JSON4Lua: JSON encoding / decoding support for the Lua language.
--- json Module.
--- Author: Craig Mason-Jones
--- Homepage: http://github.com/craigmj/json4lua/
--- Version: 1.0.0
--- This module is released under the MIT License (MIT).
--- Please see LICENCE.txt for details.
---
--- USAGE:
--- This module exposes two functions:
--- json.encode(o)
--- Returns the table / string / boolean / number / nil / json.null value as a JSON-encoded string.
--- json.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.
--- json.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")
-
------------------------------------------------------------------------------
--- Module declaration
------------------------------------------------------------------------------
-local json = {} -- Public namespace
-local json_private = {} -- Private namespace
-
--- Public constants
-json.EMPTY_ARRAY={}
-json.EMPTY_OBJECT={}
-
--- 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 json.encode (v)
- -- Handle nil values
- if v==nil then
- return "null"
- end
-
- local vtype = type(v)
-
- -- Handle strings
- if vtype=='string' then
- return '"' .. json_private.encodeString(v) .. '"' -- Need to handle encoding in string
- end
-
- -- Handle booleans
- if vtype=='number' or vtype=='boolean' then
- return 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, json.encode(v[i]))
- end
- else -- An object, not an array
- for i,j in pairs(v) do
- if isEncodable(i) and isEncodable(j) then
- table.insert(rval, '"' .. json_private.encodeString(i) .. '":' .. json.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==json.null then
- return 'null'
- end
-
- assert(false,'encode attempt to encode unsupported type ' .. vtype .. ':' .. 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 json.decode(s, startPos)
- startPos = startPos and startPos or 1
- startPos = decode_scanWhitespace(s,startPos)
- 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 json.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 json.null()
- return json.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)
- 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
- local index = 1
- repeat
- startPos = decode_scanWhitespace(s,startPos)
- 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
- assert(startPos<=stringLen, 'JSON String ended unexpectedly scanning array.')
- object, startPos = json.decode(s,startPos)
- array[index] = object
- index = index + 1
- 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)
- 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)
- 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 pairs(constNames) do
- if string.sub(s,startPos, startPos + string.len(k) -1 )==k then
- return consts[k], startPos + string.len(k)
- end
- end
- 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 = load(stringValue)
- 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
- 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)
- 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
- assert(startPos<=stringLen, 'JSON string ended unexpectedly scanning object.')
- -- Scan the key
- key, startPos = json.decode(s,startPos)
- assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
- startPos = decode_scanWhitespace(s,startPos)
- assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
- assert(string.sub(s,startPos,startPos)==':','JSON object key-value assignment mal-formed at ' .. startPos)
- startPos = decode_scanWhitespace(s,startPos+1)
- assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
- value, startPos = json.decode(s,startPos)
- object[key]=value
- until false -- infinite loop while key-value pairs are found
-end
-
--- START SoniEx2
--- Initialize some things used by decode_scanString
--- You know, for efficiency
-local escapeSequences = {
- ["\\t"] = "\t",
- ["\\f"] = "\f",
- ["\\r"] = "\r",
- ["\\n"] = "\n",
- ["\\b"] = "\b"
-}
-setmetatable(escapeSequences, {__index = function(t,k)
- -- skip "\" aka strip escape
- return string.sub(k,2)
-end})
--- END SoniEx2
-
---- 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)
- assert(startPos, 'decode_scanString(..) called without start position')
- local startChar = string.sub(s,startPos,startPos)
- -- START SoniEx2
- -- PS: I don't think single quotes are valid JSON
- assert(startChar == [["]] or startChar == [[']],'decode_scanString called for a non-string')
- --assert(startPos, "String decoding failed: missing closing " .. startChar .. " for string at position " .. oldStart)
- local t = {}
- local i,j = startPos,startPos
- while string.find(s, startChar, j+1) ~= j+1 do
- local oldj = j
- i,j = string.find(s, "\\.", j+1)
- local x,y = string.find(s, startChar, oldj+1)
- if not i or x < i then
- i,j = x,y-1
- end
- table.insert(t, string.sub(s, oldj+1, i-1))
- if string.sub(s, i, j) == "\\u" then
- local a = string.sub(s,j+1,j+4)
- j = j + 4
- local n = tonumber(a, 16)
- assert(n, "String decoding failed: bad Unicode escape " .. a .. " at position " .. i .. " : " .. j)
- -- math.floor(x/2^y) == lazy right shift
- -- a % 2^b == bitwise_and(a, (2^b)-1)
- -- 64 = 2^6
- -- 4096 = 2^12 (or 2^6 * 2^6)
- local x
- if n < 0x80 then
- x = string.char(n % 0x80)
- elseif n < 0x800 then
- -- [110x xxxx] [10xx xxxx]
- x = string.char(0xC0 + (math.floor(n/64) % 0x20), 0x80 + (n % 0x40))
- else
- -- [1110 xxxx] [10xx xxxx] [10xx xxxx]
- x = string.char(0xE0 + (math.floor(n/4096) % 0x10), 0x80 + (math.floor(n/64) % 0x40), 0x80 + (n % 0x40))
- end
- table.insert(t, x)
- else
- table.insert(t, escapeSequences[string.sub(s, i, j)])
- end
- end
- table.insert(t,string.sub(j, j+1))
- assert(string.find(s, startChar, j+1), "String decoding failed: missing closing " .. startChar .. " at position " .. j .. "(for string at position " .. startPos .. ")")
- return table.concat(t,""), j+2
- -- END SoniEx2
-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.
-
-local escapeList = {
- ['"'] = '\\"',
- ['\\'] = '\\\\',
- ['/'] = '\\/',
- ['\b'] = '\\b',
- ['\f'] = '\\f',
- ['\n'] = '\\n',
- ['\r'] = '\\r',
- ['\t'] = '\\t'
-}
-
-function json_private.encodeString(s)
- local s = tostring(s)
- return s:gsub(".", function(c) return escapeList[c] end) -- SoniEx2: 5.0 compat
-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')
- if (t == json.EMPTY_ARRAY) then return true, 0 end
- if (t == json.EMPTY_OBJECT) then return false end
-
- local maxIndex = 0
- for k,v in pairs(t) do
- if (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 ~= (t.n or #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 = type(o)
- return (t=='string' or t=='boolean' or t=='number' or t=='nil' or t=='table') or
- (t=='function' and o==json.null)
-end
-
-return json
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