prosody
4e376a43fe40
util/datamapper.lua

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util/datamapper.lua @ 11456:4e376a43fe40

util.datamapper: Factor out common schema unpacking This code extracts the bits from the schema that determines how the data is to be mapped to/from XML.
author Kim Alvefur <zash@zash.se>
date Sun, 14 Mar 2021 16:50:49 +0100
parent 11455:a5050e21ab08
child 11457:6a51749af7f4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local st = require("util.stanza");
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2
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3 local function toboolean(s)
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4 if s == "true" or s == "1" then
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5 return true
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6 elseif s == "false" or s == "0" then
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7 return false
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8 elseif s then
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9 return true
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10 end
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11 end
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12
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13 local function totype(t, s)
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14 if t == "string" then
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15 return s
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16 elseif t == "boolean" then
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17 return toboolean(s)
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18 elseif t == "number" or t == "integer" then
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19 return tonumber(s)
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20 end
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21 end
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22
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23 local value_goes = {}
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24
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25 local function unpack_propschema(propschema, propname, current_ns)
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26
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27 local proptype = "string"
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28 local value_where = "in_text_tag"
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29 local name = propname
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30 local namespace = current_ns
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31 local prefix
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32 local single_attribute
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33 local enums
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34
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35 if type(propschema) == "table" then
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36 proptype = propschema.type
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37 elseif type(propschema) == "string" then
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38 proptype = propschema
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39 end
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40
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41 if type(propschema) == "table" then
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42 local xml = propschema.xml
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43 if xml then
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44 if xml.name then
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45 name = xml.name
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46 end
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47 if xml.namespace then
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48 namespace = xml.namespace
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49 end
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50 if xml.prefix then
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51 prefix = xml.prefix
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52 end
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53
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54 if xml.attribute then
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55 value_where = "in_attribute"
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56 elseif xml.text then
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57 value_where = "in_text"
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58 elseif xml.x_name_is_value then
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59 value_where = "in_tag_name"
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60 elseif xml.x_single_attribute then
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61 single_attribute = xml.x_single_attribute
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62 value_where = "in_single_attribute"
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63 end
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64 end
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65 if propschema["const"] then
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66 enums = {propschema["const"]}
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67 elseif propschema["enum"] then
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68 enums = propschema["enum"]
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69 end
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70 end
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71
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72 if proptype == "object" or proptype == "array" then
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73 value_where = "in_children"
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74 end
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75
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76 return proptype, value_where, name, namespace, prefix, single_attribute, enums
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77 end
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78
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79 local function parse_object(schema, s)
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80 local out = {}
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81 if schema.properties then
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82 for prop, propschema in pairs(schema.properties) do
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83
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84 local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns)
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85
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86 local value
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87 if value_where == "in_tag_name" then
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88 local c
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89 if proptype == "boolean" then
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90 c = s:get_child(name, namespace);
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91 elseif enums and proptype == "string" then
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92
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93 for i = 1, #enums do
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94 c = s:get_child(enums[i], namespace);
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95 if c then
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96 break
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97 end
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98 end
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99 else
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100 c = s:get_child(nil, namespace);
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101 end
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102 value = c.name;
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103 elseif value_where == "in_attribute" then
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104 local attr = name
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105 if prefix then
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106 attr = prefix .. ":" .. name
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107 elseif namespace ~= s.attr.xmlns then
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108 attr = namespace .. "\1" .. name
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109 end
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110 value = s.attr[attr]
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111
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112 elseif value_where == "in_text" then
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113 value = s:get_text()
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114
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115 elseif value_where == "in_single_attribute" then
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116 local c = s:get_child(name, namespace)
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117 value = c and c.attr[single_attribute]
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118 elseif value_where == "in_text_tag" then
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119 value = s:get_child_text(name, namespace)
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120 elseif value_where == "in_children" and type(propschema) == "table" then
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121 if proptype == "object" then
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122 local c = s:get_child(name, namespace)
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123 if c then
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124 out[prop] = parse_object(propschema, c);
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125 end
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126
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127 end
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128 end
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129 if value_where ~= "in_children" then
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130 out[prop] = totype(proptype, value)
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131 end
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132 end
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133 end
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134
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135 return out
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136 end
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137
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138 local function parse(schema, s)
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parents:
diff changeset
139 if schema.type == "object" then
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140 return parse_object(schema, s)
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diff changeset
141 end
a1fa6202fa13 util.datamapper: Library for extracting data from stanzas
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142 end
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143
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144 local function unparse(schema, t, current_name, current_ns)
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145 if schema.type == "object" then
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146
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147 if schema.xml then
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diff changeset
148 if schema.xml.name then
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149 current_name = schema.xml.name
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150 end
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151 if schema.xml.namespace then
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152 current_ns = schema.xml.namespace
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153 end
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154
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155 end
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156
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157 local out = st.stanza(current_name, {xmlns = current_ns})
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158
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159 for prop, propschema in pairs(schema.properties) do
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160 local v = t[prop]
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161
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162 if v ~= nil then
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163
11456
4e376a43fe40 util.datamapper: Factor out common schema unpacking
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164 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns)
11436
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165
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166 if value_where == "in_attribute" then
11436
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167 local attr = name
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168 if prefix then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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169 attr = prefix .. ":" .. name
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170 elseif namespace ~= current_ns then
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171 attr = namespace .. "\1" .. name
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172 end
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173
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174 if proptype == "string" and type(v) == "string" then
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175 out.attr[attr] = v
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176 elseif proptype == "number" and type(v) == "number" then
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177 out.attr[attr] = string.format("%g", v)
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178 elseif proptype == "integer" and type(v) == "number" then
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179 out.attr[attr] = string.format("%d", v)
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180 elseif proptype == "boolean" then
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181 out.attr[attr] = v and "1" or "0"
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182 end
11454
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183 elseif value_where == "in_text" then
11436
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184 if type(v) == "string" then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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185 out:text(v)
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186 end
11454
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187 elseif value_where == "in_single_attribute" then
11439
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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188 local propattr = {}
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189
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
190 if namespace ~= current_ns then
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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191 propattr.xmlns = namespace
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192 end
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diff changeset
193
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
194 if proptype == "string" and type(v) == "string" then
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195 propattr[single_attribute] = v
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196 elseif proptype == "number" and type(v) == "number" then
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
197 propattr[single_attribute] = string.format("%g", v)
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198 elseif proptype == "integer" and type(v) == "number" then
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diff changeset
199 propattr[single_attribute] = string.format("%d", v)
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diff changeset
200 elseif proptype == "boolean" and type(v) == "boolean" then
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diff changeset
201 propattr[single_attribute] = v and "1" or "0"
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
202 end
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
203 out:tag(name, propattr):up();
9abcdfdcdb01 util.datamapper: Add support for mapping of elements where only one attribute matters
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diff changeset
204
11436
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diff changeset
205 else
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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diff changeset
206 local propattr
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
207 if namespace ~= current_ns then
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diff changeset
208 propattr = {xmlns = namespace}
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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diff changeset
209 end
11454
1d9c1893cc5e util.datamapper: Use enum instead of mutually exclusive booleans
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diff changeset
210 if value_where == "in_tag_name" then
11438
b7807583de34 util.datamapper: Add logic for "boolean" tags here the presence means true
Kim Alvefur <zash@zash.se>
parents: 11437
diff changeset
211 if proptype == "string" and type(v) == "string" then
b7807583de34 util.datamapper: Add logic for "boolean" tags here the presence means true
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parents: 11437
diff changeset
212 out:tag(v, propattr):up();
b7807583de34 util.datamapper: Add logic for "boolean" tags here the presence means true
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diff changeset
213 elseif proptype == "boolean" and v == true then
b7807583de34 util.datamapper: Add logic for "boolean" tags here the presence means true
Kim Alvefur <zash@zash.se>
parents: 11437
diff changeset
214 out:tag(name, propattr):up();
b7807583de34 util.datamapper: Add logic for "boolean" tags here the presence means true
Kim Alvefur <zash@zash.se>
parents: 11437
diff changeset
215 end
11437
87a684df4b65 util.datamapper: Invent extension for using tag name as value
Kim Alvefur <zash@zash.se>
parents: 11436
diff changeset
216 elseif proptype == "string" and type(v) == "string" then
11436
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
217 out:text_tag(name, v, propattr)
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
218 elseif proptype == "number" and type(v) == "number" then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
219 out:text_tag(name, string.format("%g", v), propattr)
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
220 elseif proptype == "integer" and type(v) == "number" then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
221 out:text_tag(name, string.format("%d", v), propattr)
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
222 elseif proptype == "boolean" and type(v) == "boolean" then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
223 out:text_tag(name, v and "1" or "0", propattr)
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
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diff changeset
224 elseif proptype == "object" and type(propschema) == "table" and type(v) == "table" then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
225 local c = unparse(propschema, v, name, namespace);
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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parents: 11435
diff changeset
226 if c then
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
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diff changeset
227 out:add_direct_child(c);
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
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diff changeset
228 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
229
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
230 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
231 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
232 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
233 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
234 return out
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
235
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
236 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
237 end
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
238
5df9ffc25bb4 util.datamapper: Add 'unparse' for turning tables into XML
Kim Alvefur <zash@zash.se>
parents: 11435
diff changeset
239 return {parse = parse; unparse = unparse}