webmcp
annotate framework/env/encode/json.lua @ 29:0b7e87f2dc91
add trace.debug_traceback() function
It inserts a traceback into the trace debug log. Usefull on development of unknown code.
It inserts a traceback into the trace debug log. Usefull on development of unknown code.
| author | Daniel Poelzleithner <poelzi@poelzi.org> |
|---|---|
| date | Mon Sep 20 15:29:23 2010 +0200 (2010-09-20) |
| 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 |