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teal-src/util/datamapper.tl @ 12564:36e769c64054
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author | Kim Alvefur <zash@zash.se> |
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date | Thu, 10 Sep 2020 21:58:24 +0200 |
parent | 12133:11060c8919b6 |
child | 12580:a9dbf657c894 |
rev | line source |
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1 -- Copyright (C) 2021 Kim Alvefur |
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2 -- |
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3 -- This project is MIT/X11 licensed. Please see the |
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4 -- COPYING file in the source package for more information. |
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5 -- |
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6 -- Based on |
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7 -- https://json-schema.org/draft/2020-12/json-schema-core.html |
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8 -- https://json-schema.org/draft/2020-12/json-schema-validation.html |
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9 -- http://spec.openapis.org/oas/v3.0.1#xmlObject |
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10 -- https://github.com/OAI/OpenAPI-Specification/issues/630 (text:true) |
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11 -- |
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12 -- XML Object Extensions: |
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13 -- text to refer to the text content at the same time as attributes |
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14 -- x_name_is_value for enum fields where the <tag-name/> is the value |
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15 -- x_single_attribute for <tag attr="this"/> |
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16 -- |
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18 -- TODO cleanup / refactor | |
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19 -- TODO s/number/integer/ once we have appropriate math.type() compat |
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21 |
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22 local st = require "util.stanza"; |
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23 local json = require"util.json" |
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24 local pointer = require"util.jsonpointer"; |
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25 |
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26 local json_type_name = json.json_type_name; |
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27 local json_schema_object = require "util.jsonschema" |
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28 local type schema_t = boolean | json_type_name | json_schema_object |
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29 |
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30 local function toboolean ( s : string ) : boolean |
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31 if s == "true" or s == "1" then |
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32 return true |
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33 elseif s == "false" or s == "0" then |
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34 return false |
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35 elseif s then |
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36 return true |
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37 end |
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38 end |
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39 |
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40 local function totype(t : json_type_name, s : string) : any |
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41 if not s then return nil end |
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42 if t == "string" then |
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43 return s; |
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44 elseif t == "boolean" then |
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45 return toboolean(s) |
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46 elseif t == "number" or t == "integer" then |
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47 return tonumber(s) |
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48 end |
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49 end |
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50 |
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51 local enum value_goes |
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52 "in_tag_name" |
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53 "in_text" |
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54 "in_text_tag" |
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55 "in_attribute" |
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56 "in_single_attribute" |
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57 "in_children" |
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58 "in_wrapper" |
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59 end |
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60 |
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61 local function resolve_schema(schema : schema_t, root : json_schema_object) : schema_t |
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62 if schema is json_schema_object and schema["$ref"] and schema["$ref"]:sub(1, 1) == "#" then |
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63 local referenced = pointer.resolve(root as table, schema["$ref"]:sub(2)) as schema_t; |
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64 if referenced ~= nil then |
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65 return referenced |
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66 end |
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67 end |
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68 return schema; |
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69 end |
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70 |
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71 local function unpack_propschema( propschema : schema_t, propname : string, current_ns : string ) |
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72 : json_type_name, value_goes, string, string, string, string, { any } |
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73 local proptype : json_type_name = "string" |
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74 local value_where : value_goes = propname and "in_text_tag" or "in_text" |
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75 local name = propname |
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76 local namespace : string |
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77 local prefix : string |
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78 local single_attribute : string |
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79 local enums : { any } |
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80 |
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81 if propschema is json_schema_object then |
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82 proptype = propschema.type |
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83 elseif propschema is json_type_name then |
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84 proptype = propschema |
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85 end |
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86 |
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87 if proptype == "object" or proptype == "array" then |
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88 value_where = "in_children" |
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89 end |
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90 |
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91 if propschema is json_schema_object then |
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92 local xml = propschema.xml |
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93 if xml then |
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94 if xml.name then |
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95 name = xml.name |
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96 end |
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97 if xml.namespace and xml.namespace ~= current_ns then |
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98 namespace = xml.namespace |
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99 end |
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100 if xml.prefix then |
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101 prefix = xml.prefix |
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102 end |
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103 if proptype == "array" and xml.wrapped then |
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104 value_where = "in_wrapper" |
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105 elseif xml.attribute then |
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106 value_where = "in_attribute" |
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107 elseif xml.text then |
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108 value_where = "in_text" |
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109 elseif xml.x_name_is_value then |
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110 value_where = "in_tag_name" |
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111 elseif xml.x_single_attribute then |
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112 single_attribute = xml.x_single_attribute |
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113 value_where = "in_single_attribute" |
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114 end |
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115 end |
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116 if propschema["const"] then |
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117 enums = { propschema["const"] } |
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118 elseif propschema["enum"] then |
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119 enums = propschema["enum"] |
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120 end |
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121 end |
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122 |
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123 return proptype, value_where, name, namespace, prefix, single_attribute, enums |
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124 end |
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125 |
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126 local parse_object : function (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { string : any } |
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127 local parse_array : function (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { any } |
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128 |
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129 local function extract_value (s : st.stanza_t, value_where : value_goes, proptype : json.json_type_name, name : string, namespace : string, prefix : string, single_attribute : string, enums : { any }) : string |
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130 if value_where == "in_tag_name" then |
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131 local c : st.stanza_t |
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132 if proptype == "boolean" then |
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133 c = s:get_child(name, namespace); |
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134 elseif enums and proptype == "string" then |
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135 -- XXX O(n²) ? |
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136 -- Probably better to flip the table and loop over :childtags(nil, ns), should be 2xO(n) |
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137 -- BUT works first, optimize later |
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138 for i = 1, #enums do |
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139 c = s:get_child(enums[i] as string, namespace); |
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140 if c then break end |
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141 end |
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142 else |
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143 c = s:get_child(nil, namespace); |
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144 end |
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145 if c then |
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146 return c.name; |
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147 end |
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148 elseif value_where == "in_attribute" then |
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149 local attr = name |
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150 if prefix then |
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151 attr = prefix .. ':' .. name |
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152 elseif namespace and namespace ~= s.attr.xmlns then |
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153 attr = namespace .. "\1" .. name |
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154 end |
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155 return s.attr[attr] |
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156 |
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157 elseif value_where == "in_text" then |
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158 return s:get_text() |
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159 |
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160 elseif value_where == "in_single_attribute" then |
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161 local c = s:get_child(name, namespace) |
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162 return c and c.attr[single_attribute] |
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163 elseif value_where == "in_text_tag" then |
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164 return s:get_child_text(name, namespace) |
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165 end |
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166 end |
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167 |
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168 function parse_object (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { string : any } |
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169 local out : { string : any } = {} |
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170 schema = resolve_schema(schema, root) |
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171 if schema is json_schema_object and schema.properties then |
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172 for prop, propschema in pairs(schema.properties) do |
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173 propschema = resolve_schema(propschema, root) |
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174 |
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175 local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns) |
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176 |
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177 if value_where == "in_children" and propschema is json_schema_object then |
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178 if proptype == "object" then |
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179 local c = s:get_child(name, namespace) |
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180 if c then |
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181 out[prop] = parse_object(propschema, c, root); |
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182 end |
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183 elseif proptype == "array" then |
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184 local a = parse_array(propschema, s, root); |
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185 if a and a[1] ~= nil then |
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186 out[prop] = a; |
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187 end |
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188 else |
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189 error "unreachable" |
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190 end |
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191 elseif value_where == "in_wrapper" and propschema is json_schema_object and proptype == "array" then |
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192 local wrapper = s:get_child(name, namespace); |
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193 if wrapper then |
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194 out[prop] = parse_array(propschema, wrapper, root); |
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195 end |
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196 else |
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197 local value : string = extract_value (s, value_where, proptype, name, namespace, prefix, single_attribute, enums) |
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198 |
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199 out[prop] = totype(proptype, value) |
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200 end |
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201 end |
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202 end |
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203 |
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204 return out |
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205 end |
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206 |
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207 function parse_array (schema : json_schema_object, s : st.stanza_t, root : json_schema_object) : { any } |
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208 local itemschema : schema_t = resolve_schema(schema.items, root); |
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209 local proptype, value_where, child_name, namespace, prefix, single_attribute, enums = unpack_propschema(itemschema, nil, s.attr.xmlns) |
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210 local attr_name : string |
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211 if value_where == "in_single_attribute" then -- FIXME this shouldn't be needed |
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212 value_where = "in_attribute"; |
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213 attr_name = single_attribute; |
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214 end |
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215 local out : { any } = {} |
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216 |
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217 if proptype == "object" then |
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218 if itemschema is json_schema_object then |
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219 for c in s:childtags(child_name, namespace) do |
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220 table.insert(out, parse_object(itemschema, c, root)); |
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221 end |
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222 else |
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223 error "array items must be schema object" |
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224 end |
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225 elseif proptype == "array" then |
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226 if itemschema is json_schema_object then |
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227 for c in s:childtags(child_name, namespace) do |
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228 table.insert(out, parse_array(itemschema, c, root)); |
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229 end |
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230 end |
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231 else |
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232 for c in s:childtags(child_name, namespace) do |
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233 local value : string = extract_value (c, value_where, proptype, attr_name or child_name, namespace, prefix, single_attribute, enums) |
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234 |
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235 table.insert(out, totype(proptype, value)); |
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236 end |
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237 end |
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238 return out; |
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239 end |
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240 |
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241 local function parse (schema : json_schema_object, s : st.stanza_t) : table |
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242 if schema.type == "object" then |
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243 return parse_object(schema, s, schema) |
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244 elseif schema.type == "array" then |
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245 return parse_array(schema, s, schema) |
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246 else |
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247 error "top-level scalars unsupported" |
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248 end |
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249 end |
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250 |
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251 local function toxmlstring(proptype : json_type_name, v : any) : string |
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252 if proptype == "string" and v is string then |
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253 return v |
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254 elseif proptype == "number" and v is number then |
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255 return string.format("%g", v) |
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256 elseif proptype == "integer" and v is number then -- TODO is integer |
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257 return string.format("%d", v) |
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258 elseif proptype == "boolean" then |
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259 return v and "1" or "0" |
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260 end |
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261 end |
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262 |
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263 local unparse : function (json_schema_object, table, string, string, st.stanza_t, json_schema_object) : st.stanza_t |
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264 |
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265 local function unparse_property(out : st.stanza_t, v : any, proptype : json_type_name, propschema : schema_t, value_where : value_goes, name : string, namespace : string, current_ns : string, prefix : string, single_attribute : string, root : json_schema_object) |
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266 |
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267 if value_where == "in_attribute" then |
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268 local attr = name |
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269 if prefix then |
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270 attr = prefix .. ':' .. name |
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271 elseif namespace and namespace ~= current_ns then |
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272 attr = namespace .. "\1" .. name |
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273 end |
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274 |
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275 out.attr[attr] = toxmlstring(proptype, v) |
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276 elseif value_where == "in_text" then |
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277 out:text(toxmlstring(proptype, v)) |
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278 elseif value_where == "in_single_attribute" then |
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279 assert(single_attribute) |
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280 local propattr : { string : string } = {} |
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281 |
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282 if namespace and namespace ~= current_ns then |
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283 propattr.xmlns = namespace |
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284 end |
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285 |
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286 propattr[single_attribute] = toxmlstring(proptype, v) |
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287 out:tag(name, propattr):up(); |
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288 |
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289 else |
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290 local propattr : { string : string } |
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291 if namespace ~= current_ns then |
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292 propattr = { xmlns = namespace } |
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293 end |
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294 if value_where == "in_tag_name" then |
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295 if proptype == "string" and v is string then |
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296 out:tag(v, propattr):up(); |
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297 elseif proptype == "boolean" and v == true then |
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298 out:tag(name, propattr):up(); |
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299 end |
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300 elseif proptype == "object" and propschema is json_schema_object and v is table then |
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301 local c = unparse(propschema, v, name, namespace, nil, root); |
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302 if c then |
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303 out:add_direct_child(c); |
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304 end |
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305 elseif proptype == "array" and propschema is json_schema_object and v is table then |
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306 if value_where == "in_wrapper" then |
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307 local c = unparse(propschema, v, name, namespace, nil, root); |
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308 if c then |
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309 out:add_direct_child(c); |
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310 end |
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311 else |
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312 unparse(propschema, v, name, namespace, out, root); |
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313 end |
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314 else |
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315 out:text_tag(name, toxmlstring(proptype, v), propattr) |
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316 end |
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317 end |
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318 end |
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319 |
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320 function unparse ( schema : json_schema_object, t : table, current_name : string, current_ns : string, ctx : st.stanza_t, root : json_schema_object ) : st.stanza_t |
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321 |
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322 if root == nil then root = schema end |
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323 |
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324 if schema.xml then |
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325 if schema.xml.name then |
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326 current_name = schema.xml.name |
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327 end |
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328 if schema.xml.namespace then |
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329 current_ns = schema.xml.namespace |
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330 end |
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331 -- TODO prefix? |
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332 end |
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333 |
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334 local out = ctx or st.stanza(current_name, { xmlns = current_ns }) |
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335 |
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336 if schema.type == "object" then |
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337 |
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338 for prop, propschema in pairs(schema.properties) do |
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339 propschema = resolve_schema(propschema, root) |
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340 local v = t[prop] |
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341 |
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342 if v ~= nil then |
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343 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns) |
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344 unparse_property(out, v, proptype, propschema, value_where, name, namespace, current_ns, prefix, single_attribute, root) |
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345 end |
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346 end |
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347 return out; |
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348 |
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349 elseif schema.type == "array" then |
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350 local itemschema = resolve_schema(schema.items, root) |
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351 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(itemschema, current_name, current_ns) |
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352 for _, item in ipairs(t as { string }) do |
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353 unparse_property(out, item, proptype, itemschema, value_where, name, namespace, current_ns, prefix, single_attribute, root) |
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354 end |
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355 return out; |
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356 end |
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357 end |
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358 |
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359 return { |
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360 parse = parse, |
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361 unparse = unparse, |
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362 } |