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teal-src/util/datamapper.tl @ 12822:6b43bf85032b
configure: Fix quoting of $LUA_SUFFIX (thanks shellcheck/Zash)
author | Matthew Wild <mwild1@gmail.com> |
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date | Thu, 29 Dec 2022 16:29:03 +0000 |
parent | 12782:8815d3090928 |
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 if not math.type then require "util.mathcompat" end |
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23 |
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24 local st = require "util.stanza"; |
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25 local json = require"util.json" |
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26 local pointer = require"util.jsonpointer"; |
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27 |
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28 local json_type_name = json.json_type_name; |
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29 local json_schema_object = require "util.jsonschema" |
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30 local type schema_t = boolean | json_schema_object |
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31 |
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32 local function toboolean ( s : string ) : boolean |
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33 if s == "true" or s == "1" then |
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34 return true |
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35 elseif s == "false" or s == "0" then |
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36 return false |
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37 elseif s then |
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38 return true |
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39 end |
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40 end |
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41 |
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42 local function totype(t : json_type_name, s : string) : any |
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43 if not s then return nil end |
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44 if t == "string" then |
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45 return s; |
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46 elseif t == "boolean" then |
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47 return toboolean(s) |
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48 elseif t == "number" or t == "integer" then |
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49 return tonumber(s) |
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50 end |
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51 end |
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52 |
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53 local enum value_goes |
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54 "in_tag_name" |
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55 "in_text" |
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56 "in_text_tag" |
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57 "in_attribute" |
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58 "in_single_attribute" |
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59 "in_children" |
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60 "in_wrapper" |
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61 end |
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62 |
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63 local function resolve_schema(schema : schema_t, root : json_schema_object) : schema_t |
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64 if schema is json_schema_object then |
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65 if schema["$ref"] and schema["$ref"]:sub(1, 1) == "#" then |
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66 return pointer.resolve(root as table, schema["$ref"]:sub(2)) as schema_t; |
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67 end |
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68 end |
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69 return schema; |
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70 end |
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71 |
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72 local function guess_schema_type(schema : json_schema_object) : json_type_name |
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73 local schema_types = schema.type |
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74 if schema_types is json_type_name then |
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75 return schema_types |
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76 elseif schema_types ~= nil then |
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77 error "schema has unsupported 'type' property" |
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78 elseif schema.properties then |
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79 return "object" |
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80 elseif schema.items then |
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81 return "array" |
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82 end |
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83 return "string" -- default assumption |
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84 end |
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85 |
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86 local function unpack_propschema( propschema : schema_t, propname : string, current_ns : string ) |
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87 : json_type_name, value_goes, string, string, string, string, { any } |
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88 local proptype : json_type_name = "string" |
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89 local value_where : value_goes = propname and "in_text_tag" or "in_text" |
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90 local name = propname |
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91 local namespace : string |
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92 local prefix : string |
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93 local single_attribute : string |
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94 local enums : { any } |
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95 |
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96 if propschema is json_schema_object then |
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97 proptype = guess_schema_type(propschema); |
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98 elseif propschema is string then -- Teal says this can never be a string, but it could before so best be sure |
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99 error("schema as string is not supported: "..propschema.." {"..current_ns.."}"..propname) |
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100 end |
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101 |
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102 if proptype == "object" or proptype == "array" then |
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103 value_where = "in_children" |
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104 end |
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105 |
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106 if propschema is json_schema_object then |
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107 local xml = propschema.xml |
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108 if xml then |
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109 if xml.name then |
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110 name = xml.name |
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111 end |
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112 if xml.namespace and xml.namespace ~= current_ns then |
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113 namespace = xml.namespace |
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114 end |
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115 if xml.prefix then |
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116 prefix = xml.prefix |
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117 end |
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118 if proptype == "array" and xml.wrapped then |
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119 value_where = "in_wrapper" |
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120 elseif xml.attribute then |
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121 value_where = "in_attribute" |
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122 elseif xml.text then |
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123 value_where = "in_text" |
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124 elseif xml.x_name_is_value then |
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125 value_where = "in_tag_name" |
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126 elseif xml.x_single_attribute then |
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127 single_attribute = xml.x_single_attribute |
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128 value_where = "in_single_attribute" |
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129 end |
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130 end |
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131 if propschema["const"] then |
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132 enums = { propschema["const"] } |
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133 elseif propschema["enum"] then |
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134 enums = propschema["enum"] |
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135 end |
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136 end |
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137 |
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138 return proptype, value_where, name, namespace, prefix, single_attribute, enums |
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139 end |
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140 |
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141 local parse_object : function (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { string : any } |
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142 local parse_array : function (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { any } |
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143 |
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144 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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145 if value_where == "in_tag_name" then |
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146 local c : st.stanza_t |
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147 if proptype == "boolean" then |
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148 c = s:get_child(name, namespace); |
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149 elseif enums and proptype == "string" then |
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150 -- XXX O(n²) ? |
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151 -- Probably better to flip the table and loop over :childtags(nil, ns), should be 2xO(n) |
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152 -- BUT works first, optimize later |
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153 for i = 1, #enums do |
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154 c = s:get_child(enums[i] as string, namespace); |
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155 if c then break end |
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156 end |
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157 else |
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158 c = s:get_child(nil, namespace); |
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159 end |
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160 if c then |
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161 return c.name; |
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162 end |
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163 elseif value_where == "in_attribute" then |
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164 local attr = name |
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165 if prefix then |
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166 attr = prefix .. ':' .. name |
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167 elseif namespace and namespace ~= s.attr.xmlns then |
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168 attr = namespace .. "\1" .. name |
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169 end |
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170 return s.attr[attr] |
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171 |
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172 elseif value_where == "in_text" then |
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173 return s:get_text() |
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174 |
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175 elseif value_where == "in_single_attribute" then |
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176 local c = s:get_child(name, namespace) |
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177 return c and c.attr[single_attribute] |
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178 elseif value_where == "in_text_tag" then |
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179 return s:get_child_text(name, namespace) |
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180 end |
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181 end |
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182 |
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183 function parse_object (schema : schema_t, s : st.stanza_t, root : json_schema_object) : { string : any } |
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184 local out : { string : any } = {} |
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185 schema = resolve_schema(schema, root) |
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186 if schema is json_schema_object and schema.properties then |
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187 for prop, propschema in pairs(schema.properties) do |
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188 propschema = resolve_schema(propschema, root) |
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189 |
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190 local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns) |
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191 |
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192 if value_where == "in_children" and propschema is json_schema_object then |
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193 if proptype == "object" then |
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194 local c = s:get_child(name, namespace) |
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195 if c then |
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196 out[prop] = parse_object(propschema, c, root); |
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197 end |
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198 elseif proptype == "array" then |
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199 local a = parse_array(propschema, s, root); |
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200 if a and a[1] ~= nil then |
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201 out[prop] = a; |
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202 end |
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203 else |
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204 error "unreachable" |
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205 end |
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206 elseif value_where == "in_wrapper" and propschema is json_schema_object and proptype == "array" then |
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207 local wrapper = s:get_child(name, namespace); |
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208 if wrapper then |
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209 out[prop] = parse_array(propschema, wrapper, root); |
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210 end |
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211 else |
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212 local value : string = extract_value (s, value_where, proptype, name, namespace, prefix, single_attribute, enums) |
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213 |
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214 out[prop] = totype(proptype, value) |
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215 end |
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216 end |
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217 end |
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218 |
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219 return out |
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220 end |
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221 |
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222 function parse_array (schema : json_schema_object, s : st.stanza_t, root : json_schema_object) : { any } |
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223 local itemschema : schema_t = resolve_schema(schema.items, root); |
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224 local proptype, value_where, child_name, namespace, prefix, single_attribute, enums = unpack_propschema(itemschema, nil, s.attr.xmlns) |
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225 local attr_name : string |
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226 if value_where == "in_single_attribute" then -- FIXME this shouldn't be needed |
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227 value_where = "in_attribute"; |
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228 attr_name = single_attribute; |
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229 end |
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230 local out : { any } = {} |
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231 |
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232 if proptype == "object" then |
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233 if itemschema is json_schema_object then |
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234 for c in s:childtags(child_name, namespace) do |
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235 table.insert(out, parse_object(itemschema, c, root)); |
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236 end |
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237 else |
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238 error "array items must be schema object" |
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239 end |
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240 elseif proptype == "array" then |
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241 if itemschema is json_schema_object then |
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242 for c in s:childtags(child_name, namespace) do |
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243 table.insert(out, parse_array(itemschema, c, root)); |
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244 end |
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245 end |
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246 else |
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247 for c in s:childtags(child_name, namespace) do |
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248 local value : string = extract_value (c, value_where, proptype, attr_name or child_name, namespace, prefix, single_attribute, enums) |
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249 |
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250 table.insert(out, totype(proptype, value)); |
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251 end |
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252 end |
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253 return out; |
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254 end |
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255 |
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256 local function parse (schema : json_schema_object, s : st.stanza_t) : table |
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257 local s_type = guess_schema_type(schema) |
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258 if s_type == "object" then |
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259 return parse_object(schema, s, schema) |
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260 elseif s_type == "array" then |
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261 return parse_array(schema, s, schema) |
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262 else |
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263 error "top-level scalars unsupported" |
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264 end |
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265 end |
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266 |
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267 local function toxmlstring(proptype : json_type_name, v : any) : string |
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268 if proptype == "string" and v is string then |
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269 return v |
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270 elseif proptype == "number" and v is number then |
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271 return string.format("%g", v) |
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272 elseif proptype == "integer" and v is number then -- TODO is integer |
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273 return string.format("%d", v) |
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274 elseif proptype == "boolean" then |
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275 return v and "1" or "0" |
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276 end |
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277 end |
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278 |
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279 local unparse : function (json_schema_object, table, string, string, st.stanza_t, json_schema_object) : st.stanza_t |
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280 |
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281 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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282 |
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283 if value_where == "in_attribute" then |
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284 local attr = name |
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285 if prefix then |
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286 attr = prefix .. ':' .. name |
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287 elseif namespace and namespace ~= current_ns then |
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288 attr = namespace .. "\1" .. name |
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289 end |
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290 |
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291 out.attr[attr] = toxmlstring(proptype, v) |
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292 elseif value_where == "in_text" then |
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293 out:text(toxmlstring(proptype, v)) |
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294 elseif value_where == "in_single_attribute" then |
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295 assert(single_attribute) |
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296 local propattr : { string : string } = {} |
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297 |
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298 if namespace and namespace ~= current_ns then |
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299 propattr.xmlns = namespace |
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300 end |
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301 |
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302 propattr[single_attribute] = toxmlstring(proptype, v) |
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303 out:tag(name, propattr):up(); |
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304 |
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305 else |
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306 local propattr : { string : string } |
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307 if namespace ~= current_ns then |
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308 propattr = { xmlns = namespace } |
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309 end |
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310 if value_where == "in_tag_name" then |
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311 if proptype == "string" and v is string then |
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312 out:tag(v, propattr):up(); |
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313 elseif proptype == "boolean" and v == true then |
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314 out:tag(name, propattr):up(); |
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315 end |
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316 elseif proptype == "object" and propschema is json_schema_object and v is table then |
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317 local c = unparse(propschema, v, name, namespace, nil, root); |
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318 if c then |
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319 out:add_direct_child(c); |
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320 end |
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321 elseif proptype == "array" and propschema is json_schema_object and v is table then |
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322 if value_where == "in_wrapper" then |
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323 local c = unparse(propschema, v, name, namespace, nil, root); |
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324 if c then |
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325 out:add_direct_child(c); |
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326 end |
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327 else |
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328 unparse(propschema, v, name, namespace, out, root); |
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329 end |
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330 else |
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331 out:text_tag(name, toxmlstring(proptype, v), propattr) |
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332 end |
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333 end |
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334 end |
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335 |
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336 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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337 |
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338 if root == nil then root = schema end |
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339 |
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340 if schema.xml then |
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341 if schema.xml.name then |
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342 current_name = schema.xml.name |
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343 end |
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344 if schema.xml.namespace then |
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345 current_ns = schema.xml.namespace |
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346 end |
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347 -- TODO prefix? |
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348 end |
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349 |
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350 local out = ctx or st.stanza(current_name, { xmlns = current_ns }) |
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351 |
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352 local s_type = guess_schema_type(schema) |
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353 if s_type == "object" then |
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354 |
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355 for prop, propschema in pairs(schema.properties) do |
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356 propschema = resolve_schema(propschema, root) |
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357 local v = t[prop] |
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358 |
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359 if v ~= nil then |
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360 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns) |
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361 unparse_property(out, v, proptype, propschema, value_where, name, namespace, current_ns, prefix, single_attribute, root) |
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362 end |
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363 end |
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364 return out; |
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365 |
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366 elseif s_type == "array" then |
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367 local itemschema = resolve_schema(schema.items, root) |
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368 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(itemschema, current_name, current_ns) |
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369 for _, item in ipairs(t as { string }) do |
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370 unparse_property(out, item, proptype, itemschema, value_where, name, namespace, current_ns, prefix, single_attribute, root) |
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371 end |
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372 return out; |
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373 end |
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374 end |
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375 |
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376 return { |
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377 parse = parse, |
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378 unparse = unparse, |
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379 } |