Github user nsuke commented on a diff in the pull request:
https://github.com/apache/thrift/pull/864#discussion_r53193197
--- Diff: lib/lua/TJsonProtocol.lua ---
@@ -0,0 +1,725 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements. See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership. The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"), you may not use this file except in compliance
+-- with the License. You may obtain a copy of the License at
+--
+-- http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing,
+-- software distributed under the License is distributed on an
+-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+-- KIND, either express or implied. See the License for the
+-- specific language governing permissions and limitations
+-- under the License.
+--
+
+require 'TProtocol'
+require 'libluabpack'
+require 'libluabitwise'
+
+TJSONProtocol = __TObject.new(TProtocolBase, {
+ __type = 'TJSONProtocol',
+ THRIFT_JSON_PROTOCOL_VERSION = 1,
+ jsonContext = {},
+ jsonContextVal = {first = true, colon = true, ttype = 2, null = true},
+ jsonContextIndex = 1,
+ hasReadByte = ""
+})
+
+TTypeToString = {}
+TTypeToString[TType.BOOL] = "tf"
+TTypeToString[TType.BYTE] = "i8"
+TTypeToString[TType.I16] = "i16"
+TTypeToString[TType.I32] = "i32"
+TTypeToString[TType.I64] = "i64"
+TTypeToString[TType.DOUBLE] = "dbl"
+TTypeToString[TType.STRING] = "str"
+TTypeToString[TType.STRUCT] = "rec"
+TTypeToString[TType.LIST] = "lst"
+TTypeToString[TType.SET] = "set"
+TTypeToString[TType.MAP] = "map"
+
+StringToTType = {
+ tf = TType.BOOL,
+ i8 = TType.BYTE,
+ i16 = TType.I16,
+ i32 = TType.I32,
+ i64 = TType.I64,
+ dbl = TType.DOUBLE,
+ str = TType.STRING,
+ rec = TType.STRUCT,
+ map = TType.MAP,
+ set = TType.SET,
+ lst = TType.LIST
+}
+
+JSONNode = {
+ ObjectBegin = '{',
+ ObjectEnd = '}',
+ ArrayBegin = '[',
+ ArrayEnd = ']',
+ PairSeparator = ':',
+ ElemSeparator = ',',
+ Backslash = '\\',
+ StringDelimiter = '"',
+ ZeroChar = '0',
+ EscapeChar = 'u',
+ Nan = 'NaN',
+ Infinity = 'Infinity',
+ NegativeInfinity = '-Infinity',
+ EscapeChars = "\"\\bfnrt",
+ EscapePrefix = "\\u00"
+}
+
+EscapeCharVals = {
+ '"', '\\', '\b', '\f', '\n', '\r', '\t'
+}
+
+JSONCharTable = {
+ --0 1 2 3 4 5 6 7 8 9 A B C D E F
+ 0, 0, 0, 0, 0, 0, 0, 0, 98,116,110, 0,102,114, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1,34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+}
+
+-- character table string
+local b='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+
+-- encoding
+function base64_encode(data)
+ return ((data:gsub('.', function(x)
+ local r,b='',x:byte()
+ for i=8,1,-1 do r=r..(b%2^i-b%2^(i-1)>0 and '1' or '0') end
+ return r;
+ end)..'0000'):gsub('%d%d%d?%d?%d?%d?', function(x)
+ if (#x < 6) then return '' end
+ local c=0
+ for i=1,6 do c=c+(x:sub(i,i)=='1' and 2^(6-i) or 0) end
+ return b:sub(c+1,c+1)
+ end)..({ '', '==', '=' })[#data%3+1])
+end
+
+-- decoding
+function base64_decode(data)
+ data = string.gsub(data, '[^'..b..'=]', '')
+ return (data:gsub('.', function(x)
+ if (x == '=') then return '' end
+ local r,f='',(b:find(x)-1)
+ for i=6,1,-1 do r=r..(f%2^i-f%2^(i-1)>0 and '1' or '0') end
+ return r;
+ end):gsub('%d%d%d?%d?%d?%d?%d?%d?', function(x)
+ if (#x ~= 8) then return '' end
+ local c=0
+ for i=1,8 do c=c+(x:sub(i,i)=='1' and 2^(8-i) or 0) end
+ return string.char(c)
+ end))
+end
+
+function TJSONProtocol:resetContext()
+ self.jsonContext = {}
+ self.jsonContextVal = {first = true, colon = true, ttype = 2, null =
true}
+ self.jsonContextIndex = 1
+end
+
+function TJSONProtocol:contextPush(context)
+ self.jsonContextIndex = self.jsonContextIndex + 1
+ self.jsonContext[self.jsonContextIndex] = self.jsonContextVal
+ self.jsonContextVal = context
+end
+
+function TJSONProtocol:contextPop()
+ self.jsonContextVal = self.jsonContext[self.jsonContextIndex]
+ self.jsonContextIndex = self.jsonContextIndex - 1
+end
+
+function TJSONProtocol:escapeNum()
+ if self.jsonContextVal.ttype == 1 then
+ return self.jsonContextVal.colon
+ else
+ return false
+ end
+end
+
+function TJSONProtocol:writeElemSeparator()
+ if self.jsonContextVal.null then
+ return
+ end
+ if self.jsonContextVal.first then
+ self.jsonContextVal.first = false
+ else
+ if self.jsonContextVal.ttype == 1 then
+ if self.jsonContextVal.colon then
+ self.trans:write(JSONNode.PairSeparator)
+ self.jsonContextVal.colon = false
+ else
+ self.trans:write(JSONNode.ElemSeparator)
+ self.jsonContextVal.colon = true
+ end
+ else
+ self.trans:write(JSONNode.ElemSeparator)
+ end
+ end
+end
+
+function TJSONProtocol:hexChar(val)
+ val = libluabitwise.band(val, 0x0f)
+ if val < 10 then
+ return val + 48
+ else
+ return val + 87
+ end
+end
+
+function TJSONProtocol:writeJSONEscapeChar(ch)
+ self.trans:write(JSONNode.EscapePrefix)
+ local outCh = hexChar(libluabitwise.shiftr(ch, 4))
+ local buff = libluabpack.bpack('c', outCh)
+ self.trans:write(buff)
+ outCh = hexChar(ch)
+ buff = libluabpack.bpack('c', outCh)
+ self.trans:write(buff)
+end
+
+function TJSONProtocol:writeJSONChar(byte)
+ ch = string.byte(byte)
+ if ch >= 0x30 then
+ if ch == JSONNode.Backslash then
+ self.trans:write(JSONNode.Backslash)
+ self.trans:write(JSONNode.Backslash)
+ else
+ self.trans:write(byte)
+ end
+ else
+ local outCh = JSONCharTable[ch+1]
+ if outCh == 1 then
+ self.trans:write(byte)
+ elseif outCh > 1 then
+ self.trans:write(JSONNode.Backslash)
+ local buff = libluabpack.bpack('c', outCh)
+ self.trans:write(buff)
+ else
+ self:writeJSONEscapeChar(ch)
+ end
+ end
+end
+
+function TJSONProtocol:writeJSONString(str)
+ self:writeElemSeparator()
+ self.trans:write(JSONNode.StringDelimiter)
+ -- TODO
--- End diff --
Can you elaborate on this ?
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