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jbe/bsw@0
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1 --[[--
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jbe/bsw@0
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2 json_string = -- JavaScript code representing the given datum (with quotes, if needed)
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jbe/bsw@0
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3 encode.json(
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4 obj -- true, false, nil or a number or string
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jbe/bsw@0
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5 )
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jbe/bsw@0
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6
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jbe@10
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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).
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jbe@10
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8
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jbe@1
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9 TODO: can't distinguish unambiguously between empty object and empty list!
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jbe/bsw@0
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10
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jbe/bsw@0
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11 --]]--
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jbe/bsw@0
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12
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jbe@1
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13 -- TODO: check if numeric representations are JSON compatible
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jbe@1
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14
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jbe/bsw@0
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15 function encode.json(obj)
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16 if obj == nil then
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17 return "null";
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jbe/bsw@0
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18 elseif atom.has_type(obj, atom.boolean) then
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19 return tostring(obj)
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jbe/bsw@0
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20 elseif atom.has_type(obj, atom.number) then
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jbe/bsw@0
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21 return tostring(obj)
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jbe@1
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22 elseif type(obj) == "table" then
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jbe@1
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23 local parts = {}
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jbe@1
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24 local first = true
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jbe@1
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25 if #obj > 0 then
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jbe@1
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26 parts[#parts+1] = "["
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jbe@1
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27 for idx, value in ipairs(obj) do
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jbe@1
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28 if first then
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jbe@1
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29 first = false
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jbe@1
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30 else
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jbe@1
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31 parts[#parts+1] = ","
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jbe@1
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32 end
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jbe@1
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33 parts[#parts+1] = tostring(value)
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jbe@1
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34 end
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jbe@1
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35 parts[#parts+1] = "]"
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jbe@1
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36 else
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jbe@1
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37 parts[#parts+1] = "{"
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jbe@1
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38 for key, value in pairs(obj) do
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jbe@1
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39 if first then
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jbe@1
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40 first = false
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jbe@1
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41 else
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jbe@1
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42 parts[#parts+1] = ","
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jbe@1
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43 end
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jbe@1
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44 parts[#parts+1] = encode.json(key)
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jbe@1
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45 parts[#parts+1] = ":"
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jbe@1
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46 parts[#parts+1] = encode.json(value)
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jbe@1
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47 end
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jbe@1
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48 parts[#parts+1] = "}"
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jbe@1
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49 end
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jbe@1
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50 return table.concat(parts)
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jbe/bsw@0
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51 else
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jbe@10
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52 local str = atom.dump(obj)
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jbe@10
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53 str = string.gsub(str, ".",
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jbe@10
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54 function (char)
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jbe@10
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55 if char == '\r' then return '\\r' end
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jbe@10
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56 if char == '\n' then return '\\n' end
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jbe@10
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57 if char == '\\' then return '\\\\' end
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jbe@10
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58 if char == '"' then return '\\"' end
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jbe@10
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59 local byte = string.byte(char)
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jbe@10
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60 if byte < 32 then return string.format("\\u%04x", byte) end
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jbe@10
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61 end
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jbe@10
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62 )
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jbe@10
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63 str = string.gsub(str, "</", "<\\/")
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jbe@10
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64 str = string.gsub(str, "<!%[CDATA%[", "\\u003c![CDATA[")
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jbe@10
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65 str = string.gsub(str, "]]>", "]]\\u003e")
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jbe@10
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66 return '"' .. str .. '"'
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jbe/bsw@0
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67 end
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jbe/bsw@0
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68 end
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