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teal-src/util/datamapper.tl @ 11469:087d710ed520
util.datamapper: Clear done TODO (arrays)
Relevant commits:
* 6a51749af7f4
* 0e00fa518688
* d1982b7eb00d
* c098d07e6717
* 348b191cd850
| author | Kim Alvefur <zash@zash.se> |
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| date | Sun, 21 Mar 2021 02:26:28 +0100 |
| parent | 11468:348b191cd850 |
| child | 11470:5ebad952ebf7 |
| 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 -- |
| 11452 | 17 -- TODO pointers |
| 18 -- TODO cleanup / refactor | |
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19 -- TODO s/number/integer/ once we have appropriate math.type() compat |
| 11452 | 20 -- |
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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 |
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25 local json_type_name = json.json_type_name; |
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26 local json_schema_object = require "util.jsonschema" |
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27 local type schema_t = boolean | json_type_name | json_schema_object |
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28 |
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29 local function toboolean ( s : string ) : boolean |
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30 if s == "true" or s == "1" then |
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31 return true |
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32 elseif s == "false" or s == "0" then |
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33 return false |
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34 elseif s then |
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35 return true |
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36 end |
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37 end |
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38 |
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39 local function totype(t : json_type_name, s : string) : any |
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40 if t == "string" then |
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41 return s; |
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42 elseif t == "boolean" then |
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43 return toboolean(s) |
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44 elseif t == "number" or t == "integer" then |
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45 return tonumber(s) |
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46 end |
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47 end |
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48 |
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49 local enum value_goes |
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50 "in_tag_name" |
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51 "in_text" |
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52 "in_text_tag" |
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53 "in_attribute" |
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54 "in_single_attribute" |
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55 "in_children" |
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56 "in_wrapper" |
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57 end |
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58 |
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59 local function unpack_propschema( propschema : schema_t, propname : string, current_ns : string ) |
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60 : json_type_name, value_goes, string, string, string, string, { any } |
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61 local proptype : json_type_name = "string" |
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62 local value_where : value_goes = propname and "in_text_tag" or "in_text" |
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63 local name = propname |
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64 local namespace = current_ns |
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65 local prefix : string |
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66 local single_attribute : string |
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67 local enums : { any } |
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68 |
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69 if propschema is json_schema_object then |
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70 proptype = propschema.type |
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71 elseif propschema is json_type_name then |
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72 proptype = propschema |
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73 end |
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74 |
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75 if proptype == "object" or proptype == "array" then |
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76 value_where = "in_children" |
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77 end |
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78 |
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79 if propschema is json_schema_object then |
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80 local xml = propschema.xml |
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81 if xml then |
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82 if xml.name then |
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83 name = xml.name |
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84 end |
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85 if xml.namespace then |
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86 namespace = xml.namespace |
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87 end |
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88 if xml.prefix then |
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89 prefix = xml.prefix |
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90 end |
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91 if proptype == "array" and xml.wrapped then |
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92 value_where = "in_wrapper" |
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93 elseif xml.attribute then |
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94 value_where = "in_attribute" |
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95 elseif xml.text then |
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96 value_where = "in_text" |
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97 elseif xml.x_name_is_value then |
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98 value_where = "in_tag_name" |
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99 elseif xml.x_single_attribute then |
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100 single_attribute = xml.x_single_attribute |
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101 value_where = "in_single_attribute" |
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102 end |
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103 end |
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104 if propschema["const"] then |
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105 enums = { propschema["const"] } |
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106 elseif propschema["enum"] then |
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107 enums = propschema["enum"] |
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108 end |
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109 end |
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110 |
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111 return proptype, value_where, name, namespace, prefix, single_attribute, enums |
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112 end |
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113 |
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114 local parse_object : function (schema : schema_t, s : st.stanza_t) : { string : any } |
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115 local parse_array : function (schema : schema_t, s : st.stanza_t) : { any } |
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116 |
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117 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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118 if value_where == "in_tag_name" then |
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119 local c : st.stanza_t |
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120 if proptype == "boolean" then |
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121 c = s:get_child(name, namespace); |
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122 elseif enums and proptype == "string" then |
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123 -- XXX O(n²) ? |
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124 -- Probably better to flip the table and loop over :childtags(nil, ns), should be 2xO(n) |
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125 -- BUT works first, optimize later |
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126 for i = 1, #enums do |
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127 c = s:get_child(enums[i] as string, namespace); |
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128 if c then break end |
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129 end |
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130 else |
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131 c = s:get_child(nil, namespace); |
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132 end |
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133 if c then |
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134 return c.name; |
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135 end |
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136 elseif value_where == "in_attribute" then |
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137 local attr = name |
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138 if prefix then |
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139 attr = prefix .. ':' .. name |
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140 elseif namespace ~= s.attr.xmlns then |
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141 attr = namespace .. "\1" .. name |
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142 end |
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143 return s.attr[attr] |
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144 |
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145 elseif value_where == "in_text" then |
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146 return s:get_text() |
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147 |
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148 elseif value_where == "in_single_attribute" then |
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149 local c = s:get_child(name, namespace) |
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150 return c and c.attr[single_attribute] |
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151 elseif value_where == "in_text_tag" then |
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152 return s:get_child_text(name, namespace) |
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153 end |
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154 end |
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155 |
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156 function parse_object (schema : schema_t, s : st.stanza_t) : { string : any } |
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157 local out : { string : any } = {} |
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158 if schema is json_schema_object and schema.properties then |
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159 for prop, propschema in pairs(schema.properties) do |
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160 |
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161 local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns) |
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162 |
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163 if value_where == "in_children" and propschema is json_schema_object then |
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164 if proptype == "object" then |
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165 local c = s:get_child(name, namespace) |
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166 if c then |
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167 out[prop] = parse_object(propschema, c); |
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168 end |
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169 elseif proptype == "array" then |
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170 out[prop] = parse_array(propschema, s); |
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171 else |
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172 error "unreachable" |
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173 end |
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174 elseif value_where == "in_wrapper" and propschema is json_schema_object and proptype == "array" then |
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175 local wrapper = s:get_child(name, namespace); |
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176 if wrapper then |
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177 out[prop] = parse_array(propschema, wrapper); |
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178 else |
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179 error "unreachable" |
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180 end |
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181 else |
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182 local value : string = extract_value (s, value_where, proptype, name, namespace, prefix, single_attribute, enums) |
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183 |
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184 out[prop] = totype(proptype, value) |
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185 end |
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186 end |
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187 end |
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188 |
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189 return out |
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190 end |
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191 |
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192 function parse_array (schema : json_schema_object, s : st.stanza_t) : { any } |
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193 local proptype, value_where, child_name, namespace, prefix, single_attribute, enums = unpack_propschema(schema.items, nil, s.attr.xmlns) |
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194 local attr_name : string |
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195 if value_where == "in_single_attribute" then -- FIXME this shouldn't be needed |
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196 value_where = "in_attribute"; |
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197 attr_name = single_attribute; |
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198 end |
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199 local out : { any } = {} |
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200 for c in s:childtags(child_name, namespace) do |
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201 local value : string = extract_value (c, value_where, proptype, attr_name or child_name, namespace, prefix, single_attribute, enums) |
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202 |
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203 table.insert(out, totype(proptype, value)); |
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204 end |
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205 return out; |
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206 end |
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207 |
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208 local function parse (schema : json_schema_object, s : st.stanza_t) : table |
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209 if schema.type == "object" then |
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210 return parse_object(schema, s) |
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211 elseif schema.type == "array" then |
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212 return parse_array(schema, s) |
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213 else |
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214 error "top-level scalars unsupported" |
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215 end |
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216 end |
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217 |
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218 local unparse : function (json_schema_object, table, string, string, st.stanza_t) : st.stanza_t |
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219 |
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220 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) |
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221 if value_where == "in_attribute" then |
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222 local attr = name |
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223 if prefix then |
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224 attr = prefix .. ':' .. name |
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225 elseif namespace ~= current_ns then |
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226 attr = namespace .. "\1" .. name |
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227 end |
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228 |
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229 if proptype == "string" and v is string then |
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230 out.attr[attr] = v |
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231 elseif proptype == "number" and v is number then |
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232 out.attr[attr] = string.format("%g", v) |
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233 elseif proptype == "integer" and v is number then -- TODO is integer |
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234 out.attr[attr] = string.format("%d", v) |
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235 elseif proptype == "boolean" then |
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236 out.attr[attr] = v and "1" or "0" |
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237 end |
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238 elseif value_where == "in_text" then |
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239 if v is string then |
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240 out:text(v) |
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241 end |
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242 elseif value_where == "in_single_attribute" then |
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243 assert(single_attribute) |
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244 local propattr : { string : string } = {} |
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245 |
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246 if namespace ~= current_ns then |
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247 propattr.xmlns = namespace |
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248 end |
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249 |
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250 if proptype == "string" and v is string then |
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251 propattr[single_attribute] = v |
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252 elseif proptype == "number" and v is number then |
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253 propattr[single_attribute] = string.format("%g", v) |
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254 elseif proptype == "integer" and v is number then -- TODO is integer |
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255 propattr[single_attribute] = string.format("%d", v) |
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256 elseif proptype == "boolean" and v is boolean then |
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257 propattr[single_attribute] = v and "1" or "0" |
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258 end |
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259 out:tag(name, propattr):up(); |
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260 |
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261 else |
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262 local propattr : { string : string } |
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263 if namespace ~= current_ns then |
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264 propattr = { xmlns = namespace } |
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265 end |
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266 if value_where == "in_tag_name" then |
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267 if proptype == "string" and v is string then |
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268 out:tag(v, propattr):up(); |
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269 elseif proptype == "boolean" and v == true then |
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270 out:tag(name, propattr):up(); |
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271 end |
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272 elseif proptype == "string" and v is string then |
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273 out:text_tag(name, v, propattr) |
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274 elseif proptype == "number" and v is number then |
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275 out:text_tag(name, string.format("%g", v), propattr) |
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276 elseif proptype == "integer" and v is number then -- TODO is integer |
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277 out:text_tag(name, string.format("%d", v), propattr) |
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278 elseif proptype == "boolean" and v is boolean then |
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279 out:text_tag(name, v and "1" or "0", propattr) |
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280 elseif proptype == "object" and propschema is json_schema_object and v is table then |
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281 local c = unparse(propschema, v, name, namespace); |
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282 if c then |
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283 out:add_direct_child(c); |
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284 end |
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285 elseif proptype == "array" and propschema is json_schema_object and v is table then |
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286 if value_where == "in_wrapper" then |
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287 local c = unparse(propschema, v, name, namespace); |
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288 if c then |
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289 out:add_direct_child(c); |
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290 end |
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291 else |
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292 unparse(propschema, v, name, namespace, out); |
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293 end |
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294 end |
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295 end |
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296 end |
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297 |
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298 function unparse ( schema : json_schema_object, t : table, current_name : string, current_ns : string, ctx : st.stanza_t ) : st.stanza_t |
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299 |
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300 if schema.xml then |
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301 if schema.xml.name then |
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302 current_name = schema.xml.name |
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303 end |
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304 if schema.xml.namespace then |
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305 current_ns = schema.xml.namespace |
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306 end |
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307 -- TODO prefix? |
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308 end |
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309 |
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310 local out = ctx or st.stanza(current_name, { xmlns = current_ns }) |
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311 |
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312 if schema.type == "object" then |
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313 |
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314 for prop, propschema in pairs(schema.properties) do |
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315 local v = t[prop] |
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316 |
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317 if v ~= nil then |
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318 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns) |
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319 unparse_property(out, v, proptype, propschema, value_where, name, namespace, current_ns, prefix, single_attribute) |
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320 end |
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321 end |
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322 return out; |
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323 |
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324 elseif schema.type == "array" then |
|
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325 local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(schema.items, current_name, current_ns) |
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326 for _, item in ipairs(t as { string }) do |
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327 unparse_property(out, item, proptype, schema.items, value_where, name, namespace, current_ns, prefix, single_attribute) |
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328 end |
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329 return out; |
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330 end |
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331 end |
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332 |
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333 return { |
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334 parse = parse, |
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335 unparse = unparse, |
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336 } |
