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teal-src/util/datamapper.tl

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teal-src/util/datamapper.tl @ 11435:a1fa6202fa13

util.datamapper: Library for extracting data from stanzas Based on the XML support in the OpenAPI specification.
author Kim Alvefur <zash@zash.se>
date Sun, 07 Mar 2021 00:57:36 +0100
child 11436:5df9ffc25bb4
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11435
a1fa6202fa13 util.datamapper: Library for extracting data from stanzas
Kim Alvefur <zash@zash.se>
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1 local st = require "util.stanza";
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2 local js = require "util.jsonschema"
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3
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4 local function toboolean ( s : string ) : boolean
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5 if s == "true" or s == "1" then
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6 return true
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7 elseif s == "false" or s == "0" then
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8 return false
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9 end
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10 end
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11
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12 local function parse_object (schema : js.schema_t, s : st.stanza_t) : table
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13 local out : { string : any } = {}
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14 if schema.properties then
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15 for prop, propschema in pairs(schema.properties) do
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16 -- TODO factor out, if it's generic enough
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17 local name = prop
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18 local namespace = s.attr.xmlns;
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19 local prefix : string = nil
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20 local is_attribute = false
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21 local is_text = false
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22
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23 local proptype : js.schema_t.type_e
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24 if propschema is js.schema_t then
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25 proptype = propschema.type
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26 elseif propschema is js.schema_t.type_e then
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27 proptype = propschema
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28 end
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29
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30 if propschema is js.schema_t and propschema.xml then
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31 if propschema.xml.name then
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32 name = propschema.xml.name
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33 end
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34 if propschema.xml.namespace then
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35 namespace = propschema.xml.namespace
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36 end
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37 if propschema.xml.prefix then
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38 prefix = propschema.xml.prefix
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39 end
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40 if propschema.xml.attribute then
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41 is_attribute = true
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42 elseif propschema.xml.text then
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43 is_text = true
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44 end
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45 end
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46
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47 if is_attribute then
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48 local attr = name
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49 if prefix then
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50 attr = prefix .. ':' .. name
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51 elseif namespace ~= s.attr.xmlns then
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52 attr = namespace .. "\1" .. name
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53 end
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54 if proptype == "string" then
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55 out[prop] = s.attr[attr]
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56 elseif proptype == "integer" or proptype == "number" then
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57 -- TODO floor if integer ?
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58 out[prop] = tonumber(s.attr[attr])
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59 elseif proptype == "boolean" then
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60 out[prop] = toboolean(s.attr[attr])
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61 -- else TODO
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62 end
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63
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64 elseif is_text then
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65 if proptype == "string" then
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66 out[prop] = s:get_text()
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67 elseif proptype == "integer" or proptype == "number" then
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68 out[prop] = tonumber(s:get_text())
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69 end
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70
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71 else
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72
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73 if proptype == "string" then
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74 out[prop] = s:get_child_text(name, namespace)
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75 elseif proptype == "integer" or proptype == "number" then
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76 out[prop] = tonumber(s:get_child_text(name, namespace))
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77 elseif proptype == "object" and propschema is js.schema_t then
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78 local c = s:get_child(name, namespace)
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79 if c then
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80 out[prop] = parse_object(propschema, c);
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81 end
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82 -- else TODO
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83 end
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84 end
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85 end
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86 end
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87
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88 return out
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89 end
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90
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91 local function parse (schema : js.schema_t, s : st.stanza_t) : table
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92 if schema.type == "object" then
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93 return parse_object(schema, s)
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94 end
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95 end
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96
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97 return {
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98 parse = parse,
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99 -- unparse = unparse, -- TODO
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100 }