<%
''
'' GAB_LIBRARY Copyright (C) 2003 - This file is part of GAB_LIBRARY
'' For license refer to the license.txt
''
''
'''' @CLASSTITLE: JSON
'''' @CREATOR: Michal Gabrukiewicz (gabru at grafix.at), Michael Rebec
'''' @CONTRIBUTORS: - Cliff Pruitt (opensource at crayoncowboy.com)
'''' - Sylvain Lafontaine
'''' @CREATEDON: 2007-04-26 12:46
'''' @CDESCRIPTION: Comes up with functionality for JSON (http://json.org) to use within ASP.
'''' Correct escaping of characters, generating JSON Grammer out of ASP datatypes and structures
'''' @REQUIRES: -
'''' @OPTIONEXPLICIT: yes
'''' @VERSION: 1.4
''
class JSON
''private members
private output, innerCall
''public members
public toResponse ''''[bool] should generated results be directly written to the response? default = false
''
'' constructor
''
public sub class_initialize()
newGeneration()
toResponse = false
end sub
''
'''' @SDESCRIPTION: STATIC! takes a given string and makes it JSON valid
'''' @DESCRIPTION: all characters which needs to be escaped are beeing replaced by their
'''' unicode representation according to the
'''' RFC4627#2.5 - http://www.ietf.org/rfc/rfc4627.txt?number=4627
'''' @PARAM: val [string]: value which should be escaped
'''' @RETURN: [string] JSON valid string
'''' asc 函数被替换成ascw函数以便支持中文
''
public function escape(val)
dim cDoubleQuote, cRevSolidus, cSolidus
cDoubleQuote = &h22
cRevSolidus = &h5C
cSolidus = &h2F
dim i, currentDigit
for i = 1 to (len(val))
currentDigit = mid(val, i, 1)
if ascw(currentDigit) > &h00 and ascw(currentDigit) < &h1F then
currentDigit = escapequence(currentDigit)
elseif ascw(currentDigit) >= &hC280 and ascw(currentDigit) <= &hC2BF then
currentDigit = "\u00" + right(padLeft(hex(asc(currentDigit) - &hC200), 2, 0), 2)
elseif ascw(currentDigit) >= &hC380 and ascw(currentDigit) <= &hC3BF then
currentDigit = "\u00" + right(padLeft(hex(ascw(currentDigit) - &hC2C0), 2, 0), 2)
else
select case ascw(currentDigit)
case cDoubleQuote: currentDigit = escapequence(currentDigit)
case cRevSolidus: currentDigit = escapequence(currentDigit)
case cSolidus: currentDigit = escapequence(currentDigit)
end select
end if
escape = escape & currentDigit
next
end function
''
'''' @SDESCRIPTION: generates a representation of a name value pair in JSON grammer
'''' @DESCRIPTION: the generation is done fully recursive so the value can be a complex datatype as well. e.g.
'''' toJSON("n", array(array(), 2, true), false) or toJSON("n", array(RS, dict, false), false), etc.
'''' @PARAM: name [string]: name of the value (accessible with JavaScript afterwards). leave empty to get just the value
'''' @PARAM: val [variant], [int], [float], [array], [object], [dictionary], [recordset]: value which needs
'''' to be generated. Conversation of the data types (ASP datatype -> Javascript datatype):
'''' NOTHING, NULL -> null, ARRAY -> array, BOOL -> bool, OBJECT -> name of the type,
'''' MULTIDIMENSIONAL ARRAY -> generates a 1 dimensional array (flat) with all values of the multidim array
'''' DICTIONARY -> valuepairs. each key is accessible as property afterwards
'''' RECORDSET -> array where each row of the recordset represents a field in the array.
'''' fields have properties named after the column names of the recordset (LOWERCASED!)
'''' e.g. generate(RS) can be used afterwards r[0].ID
'''' INT, FLOAT -> number
'''' OBJECT with reflect() method -> returned as object which can be used within JavaScript
'''' @PARAM: nested [bool]: is the value pair already nested within another? if yes then the {} are left out.
'''' @RETURN: [string] returns a JSON representation of the given name value pair
'''' (if toResponse is on then the return is written directly to the response and nothing is returned)
''
public function toJSON(name, val, nested)
if not nested and not isEmpty(name) then write("{")
if not isEmpty(name) then write("""" & escape(name) & """: ")
generateValue(val)
if not nested and not isEmpty(name) then write("}")
toJSON = output
if innerCall = 0 then newGeneration()
end function
''
'' generate
''
private function generateValue(val)
if isNull(val) then
write("null")
elseif isArray(val) then
generateArray(val)
elseif isObject(val) then
if val is nothing then
write("null")
elseif typename(val) = "Dictionary" then
generateDictionary(val)
elseif typename(val) = "Recordset" then
generateRecordset(val)
else
generateObject(val)
end if
else
''bool
varTyp = varType(val)
if varTyp = 11 then
if val then write("true") else write("false")
''int, long, byte
elseif varTyp = 2 or varTyp = 3 or varTyp = 17 or varTyp = 19 then
write(cLng(val))
''single, double, currency
elseif varTyp = 4 or varTyp = 5 or varTyp = 6 or varTyp = 14 then
write(replace(cDbl(val), ",", "."))
else
write("""" & escape(val & "") & """")
end if
end if
generateValue = output
end function
''
'' generateArray
''
private sub generateArray(val)
dim item, i
write("[")
i = 0
''the for each allows us to support also multi dimensional arrays
for each item in val
if i > 0 then write(",")
generateValue(item)
i = i + 1
next
write("]")
end sub
''
'' generateDictionary
''
private sub generateDictionary(val)
dim keys, i
innerCall = innerCall + 1
write("{")
keys = val.keys
for i = 0 to uBound(keys)
if i > 0 then write(",")
toJSON keys(i), val(keys(i)), true
next
write("}")
innerCall = innerCall - 1
end sub
''
'' generateRecordset
''
private sub generateRecordset(val)
dim i
write("[")
while not val.eof
innerCall = innerCall + 1
write("{")
for i = 0 to val.fields.count - 1
if i > 0 then write(",")
toJSON lCase(val.fields(i).name), val.fields(i).value, true
next
write("}")
val.movenext()
if not val.eof then write(",")
innerCall = innerCall - 1
wend
write("]")
end sub
''
'' generateObject
''
private sub generateObject(val)
dim props
on error resume next
set props = val.reflect()
if err = 0 then
on error goto 0
innerCall = innerCall + 1
toJSON empty, props, true
innerCall = innerCall - 1
else
on error goto 0
write("""" & escape(typename(val)) & """")
end if
end sub
''
'' newGeneration
''
private sub newGeneration()
output = empty
innerCall = 0
end sub
''
'' JsonEscapeSquence
''
private function escapequence(digit)
escapequence = "\u00" + right(padLeft(hex(asc(digit)), 2, 0), 2)
end function
''
'' padLeft
''
private function padLeft(value, totalLength, paddingChar)
padLeft = right(clone(paddingChar, totalLength) & value, totalLength)
end function
''
'' clone
''
public function clone(byVal str, n)
dim i
for i = 1 to n : clone = clone & str : next
end function
''
'' write
''
private sub write(val)
if toResponse then
response.write(val)
else
output = output & val
end if
end sub
end class
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