webmcp
annotate framework/env/encode/json.lua @ 34:e19b0b5c46ba
allow execptions an slot.reset_all()
this is usefull when an error is detected deep into a view where you want redirect
to something usefull, but still save some slots like notice and error slots
this is usefull when an error is detected deep into a view where you want redirect
to something usefull, but still save some slots like notice and error slots
| author | Daniel Poelzleithner <poelzi@poelzi.org> |
|---|---|
| date | Wed Oct 06 16:14:33 2010 +0200 (2010-10-06) |
| parents | e017c47d43b5 |
| children | 32ec28229bb5 |
| rev | line source |
|---|---|
| jbe/bsw@0 | 1 --[[-- |
| jbe/bsw@0 | 2 json_string = -- JavaScript code representing the given datum (with quotes, if needed) |
| jbe/bsw@0 | 3 encode.json( |
| jbe/bsw@0 | 4 obj -- true, false, nil or a number or string |
| jbe/bsw@0 | 5 ) |
| jbe/bsw@0 | 6 |
| jbe@10 | 7 This function encodes any native datatype or atom in JavaScript object notation (JSON). It ensures that the returned string can be safely included in inline scripts both in HTML and XHTML (within CDATA section). |
| jbe@10 | 8 |
| jbe@1 | 9 TODO: can't distinguish unambiguously between empty object and empty list! |
| jbe/bsw@0 | 10 |
| jbe/bsw@0 | 11 --]]-- |
| jbe/bsw@0 | 12 |
| jbe@1 | 13 -- TODO: check if numeric representations are JSON compatible |
| jbe@1 | 14 |
| jbe/bsw@0 | 15 function encode.json(obj) |
| jbe/bsw@0 | 16 if obj == nil then |
| jbe/bsw@0 | 17 return "null"; |
| jbe/bsw@0 | 18 elseif atom.has_type(obj, atom.boolean) then |
| jbe/bsw@0 | 19 return tostring(obj) |
| jbe/bsw@0 | 20 elseif atom.has_type(obj, atom.number) then |
| jbe/bsw@0 | 21 return tostring(obj) |
| jbe@1 | 22 elseif type(obj) == "table" then |
| jbe@1 | 23 local parts = {} |
| jbe@1 | 24 local first = true |
| jbe@1 | 25 if #obj > 0 then |
| jbe@1 | 26 parts[#parts+1] = "[" |
| jbe@1 | 27 for idx, value in ipairs(obj) do |
| jbe@1 | 28 if first then |
| jbe@1 | 29 first = false |
| jbe@1 | 30 else |
| jbe@1 | 31 parts[#parts+1] = "," |
| jbe@1 | 32 end |
| jbe@1 | 33 parts[#parts+1] = tostring(value) |
| jbe@1 | 34 end |
| jbe@1 | 35 parts[#parts+1] = "]" |
| jbe@1 | 36 else |
| jbe@1 | 37 parts[#parts+1] = "{" |
| jbe@1 | 38 for key, value in pairs(obj) do |
| jbe@1 | 39 if first then |
| jbe@1 | 40 first = false |
| jbe@1 | 41 else |
| jbe@1 | 42 parts[#parts+1] = "," |
| jbe@1 | 43 end |
| jbe@1 | 44 parts[#parts+1] = encode.json(key) |
| jbe@1 | 45 parts[#parts+1] = ":" |
| jbe@1 | 46 parts[#parts+1] = encode.json(value) |
| jbe@1 | 47 end |
| jbe@1 | 48 parts[#parts+1] = "}" |
| jbe@1 | 49 end |
| jbe@1 | 50 return table.concat(parts) |
| jbe/bsw@0 | 51 else |
| jbe@10 | 52 local str = atom.dump(obj) |
| jbe@10 | 53 str = string.gsub(str, ".", |
| jbe@10 | 54 function (char) |
| jbe@10 | 55 if char == '\r' then return '\\r' end |
| jbe@10 | 56 if char == '\n' then return '\\n' end |
| jbe@10 | 57 if char == '\\' then return '\\\\' end |
| jbe@10 | 58 if char == '"' then return '\\"' end |
| jbe@10 | 59 local byte = string.byte(char) |
| jbe@10 | 60 if byte < 32 then return string.format("\\u%04x", byte) end |
| jbe@10 | 61 end |
| jbe@10 | 62 ) |
| jbe@10 | 63 str = string.gsub(str, "</", "<\\/") |
| jbe@10 | 64 str = string.gsub(str, "<!%[CDATA%[", "\\u003c![CDATA[") |
| jbe@10 | 65 str = string.gsub(str, "]]>", "]]\\u003e") |
| jbe@10 | 66 return '"' .. str .. '"' |
| jbe/bsw@0 | 67 end |
| jbe/bsw@0 | 68 end |