Mercurial > prosody-modules

annotate mod_xmllang_check/xmpplang.lib.lua @ 6546:8a4e6421fd24

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mod_storage_xmlarchive: Remove unnecessary percent-encoding of paths Paths from lfs.dir() are already in the percent-encoded form. Probably confusion left over since before 1b081c8fc1d9
author Kim Alvefur <zash@zash.se>
date Sun, 24 May 2026 19:17:22 +0200
parents de3dc4297035
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6401
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1
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2
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3 local irregular = {
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4 "en-GB-oed", "i-ami", "i-bnn", "i-default", "i-enochian", "i-hak", "i-klingon", "i-lux", "i-mingo", "i-navajo", "i-pwn", "i-tao", "i-tay", "i-tsu", "sgn-BE-FR", "sgn-BE-NL", "sgn-CH-DE"
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5 };
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6 local regular = {
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7 "art-lojban", "cel-gaulish", "no-bok", "no-nyn", "zh-guoyu", "zh-hakka", "zh-min", "zh-min-nan", "zh-xiang"
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8 };
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9 local grandfathered = {};
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10 for _, tag in ipairs(irregular) do
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11 grandfathered[tag:lower()] = true;
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12 end
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13 for _, tag in ipairs(regular) do
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14 grandfathered[tag:lower()] = true;
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15 end
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16
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17 local function split_subtags(lower_s)
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18 local subtags = {};
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19 for subtag in lower_s:gmatch("[^%-]+") do -- split on hyphens
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20 table.insert(subtags, subtag);
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21 end
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22 return subtags;
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23 end
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24
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25 local function is_privateuse(lower_s)
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26 if lower_s:sub(1, 2) ~= "x-" then
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27 -- print("privateuse: " .. lower_s .. " does not start with x-");
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28 return false;
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29 end
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30
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31 -- only allow alphanum and hyphens from here on out
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32 if lower_s:match("[^a-z0-9%-]") then
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33 -- print("privateuse: " .. lower_s .. " contains non-alphanum or hyphen");
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34 return false;
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35 end
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36 -- lets not allow any zero-len subtags
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37 if lower_s:match("^%-") or lower_s:match("%-$") or lower_s:match("%-%-") then
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38 -- print("privateuse: " .. lower_s .. " contains zero-len subtags");
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39 return false;
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40 end
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41
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42 local subtags = split_subtags(lower_s);
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43 -- print("privateuse subtags: " .. table.concat(subtags, "|"));
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44 if #subtags < 2 then return false; end
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45 for i = 1, #subtags do
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46 if #subtags[i] < 1 or #subtags[i] > 8 or not subtags[i]:match("^[a-z0-9]+$") then return false; end
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47 end
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48 -- print("privateuse: " .. lower_s .. " is valid");
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49 return true;
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50 end
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51
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52 local function is_langtag(lower_s)
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53 -- print("is_langtag: " .. lower_s);
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54 -- print(" lower_s:sub(-5): ".. lower_s:sub(-5))
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55 -- Remove the optional .utf8 suffix if it exists
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56 if lower_s:sub(-6) == ".utf-8" then
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57 -- print("removing .utf-8 suffix");
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58 lower_s = lower_s:sub(1, -7);
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59 end
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60
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61 -- at this point we have a hyphen-separated string of subtags, where subtags are alphanumeric
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62
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63 -- only allow alphanum and hyphens from here on out
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64 if lower_s:match("[^a-z0-9%-]") then
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65 return false;
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66 end
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67 -- lets not allow any zero-len subtags
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68 if lower_s:match("^%-") or lower_s:match("%-$") or lower_s:match("%-%-") then
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69 return false;
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70 end
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71
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72 -- let's split on hyphens
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73 local subtags = split_subtags(lower_s);
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74
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75 -- we are now dealing with this pattern: language ( "-" script )? ( "-" region )? ( "-" variant )* ( "-" extension )*
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76 -- we'll now process in order
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77
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78 -- Let's process "language"
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79 -- print("processing language: " .. table.concat(subtags, "|"));
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80 local subtag = table.remove(subtags, 1);
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81 if not subtag or not subtag:match("^[a-z]+$") then
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82 return false;
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83 end
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84 if #subtag == 2 or #subtag == 3 then
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85 -- we want to check for 0-3 instances of three-letter tags
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86 for i = 1, 3 do
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87 local subtag = subtags[1];
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88 if subtag and #subtag == 3 and subtag:match("^[a-z]+$") then
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89 table.remove(subtags, 1);
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90 end
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91 end
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92 elseif #subtag >= 4 and #subtag <= 8 then
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93 -- passthrough
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94 else
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95 return false;
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96 end
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97
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98 -- Let's process optional: script = ALPHA{4};
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99 -- print("processing script: " .. table.concat(subtags, "|"));
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100 subtag = subtags[1];
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101 if subtag and #subtag == 4 and subtag:match("^[a-z]+$") then
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102 table.remove(subtags, 1);
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103 end
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104
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105 -- Let's process optional: region = ALPHA{2} | DIGIT{3};
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106 -- print("processing region: " .. table.concat(subtags, "|"));
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107 subtag = subtags[1];
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108 if subtag and ((#subtag == 2 and subtag:match("^[a-z][a-z]$")) or (#subtag == 3 and subtag:match("^[0-9][0-9][0-9]$"))) then
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109 table.remove(subtags, 1);
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110 end
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111
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112 -- Let's process zero or more: variant = alphanum{5,8} | ( DIGIT alphanum{3} );
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113 while true do
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114 local variant = subtags[1];
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115 if not variant or (#variant < 4 or #variant > 8) then
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116 break;
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117 end
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118 if #variant == 4 and not variant:match("^[0-9]") then return false; end
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119 table.remove(subtags, 1);
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120 end
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121
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122 -- print("processing extensions: " .. table.concat(subtags, "|"));
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123 -- Let's process zero or more: extension = singleton ( "-" alphanum{2,8} )+;
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124 while true do
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125 local extension = subtags[1];
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126 if not extension or extension == "x" then break; end
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127 if #extension ~= 1 then return false; end
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128 table.remove(subtags, 1);
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129
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130 local part = subtags[1];
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131 if not part or (#part < 2 or #part > 8) then return false; end
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132 table.remove(subtags, 1);
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133
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134 while true do
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135 part = subtags[1];
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136 if not part or (#part < 2 or #part > 8) then break; end
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137 table.remove(subtags, 1);
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138 end
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139 end
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140
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141 -- print("processing privateuse: " .. table.concat(subtags, "|"));
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142 -- Let's process optional: privateuse = "x"i ( "-" alphanum{1,8} )+;
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143 local privateuse = table.remove(subtags, 1);
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144 -- print("privateuse: " .. privateuse);
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145 if privateuse then
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146 if privateuse ~= "x" or #subtags < 1 then return false; end
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147 for i = 1, #subtags do
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148 local part = subtags[i];
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149 if #part < 1 or #part > 8 then return false; end
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150 end
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151 end
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152
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153 return true;
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154 end
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155
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156 local function is_xmpplang(s)
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157 local lower_s = s:lower();
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158 if grandfathered[lower_s] then
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159 return true;
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160 end
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161 -- print("checking privateuse: " .. lower_s);
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162 if is_privateuse(lower_s) then
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163 -- print("privateuse: " .. lower_s .. " is valid");
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164 return true;
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165 end
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166 -- print("checking langtag: " .. lower_s);
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167 if is_langtag(lower_s) then
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168 return true;
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169 end
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170 return false;
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171 end
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172
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173 -- print("=== x-abc-def")
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174 -- print(is_xmpplang("x-abc-def"));
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175 -- print("=== x-a-b-c-d-e")
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176 -- print(is_xmpplang("x-a-b-c-d-e"));
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177
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178 return is_xmpplang;