prosody
9a70a543c727
util/xml.lua

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util/xml.lua @ 11962:9a70a543c727

util.async: Add next-tick configuration Running woken runners in the next iteration of the event loop prevents unexpected recursion, unexpected tracebacks, and is generally more predictable. The pattern is borrowed from util.promise, where we're now doing the same.
author Matthew Wild <mwild1@gmail.com>
date Mon, 29 Nov 2021 14:14:30 +0000
parent 11127:1d9cd1abc660
child 12121:2162e86029b6
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cc487921746b util.xml: Initial commit; exposes parse(), which is now the canonical way to convert a string to a stanza.
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1
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2 local st = require "util.stanza";
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3 local lxp = require "lxp";
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4 local t_insert = table.insert;
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5 local t_remove = table.remove;
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6
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7 local _ENV = nil;
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8 -- luacheck: std none
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10 local parse_xml = (function()
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11 local ns_prefixes = {
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12 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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13 };
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14 local ns_separator = "\1";
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15 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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16 return function(xml)
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17 --luacheck: ignore 212/self
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18 local handler = {};
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19 local stanza = st.stanza("root");
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20 local namespaces = {};
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21 local prefixes = {};
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22 function handler:StartNamespaceDecl(prefix, url)
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23 if prefix ~= nil then
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24 t_insert(namespaces, url);
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25 t_insert(prefixes, prefix);
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26 end
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27 end
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28 function handler:EndNamespaceDecl(prefix)
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29 if prefix ~= nil then
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30 -- we depend on each StartNamespaceDecl having a paired EndNamespaceDecl
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31 t_remove(namespaces);
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32 t_remove(prefixes);
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33 end
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34 end
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35 function handler:StartElement(tagname, attr)
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36 local curr_ns,name = tagname:match(ns_pattern);
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37 if name == "" then
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38 curr_ns, name = "", curr_ns;
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39 end
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40 if curr_ns ~= "" then
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41 attr.xmlns = curr_ns;
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42 end
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43 for i=1,#attr do
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44 local k = attr[i];
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45 attr[i] = nil;
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46 local ns, nm = k:match(ns_pattern);
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47 if nm ~= "" then
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48 ns = ns_prefixes[ns];
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49 if ns then
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50 attr[ns..":"..nm] = attr[k];
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51 attr[k] = nil;
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52 end
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53 end
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54 end
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55 local n = {}
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56 for i=1,#namespaces do
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57 n[prefixes[i]] = namespaces[i];
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58 end
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59 stanza:tag(name, attr, n);
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60 end
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61 function handler:CharacterData(data)
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62 stanza:text(data);
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63 end
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64 function handler:EndElement()
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65 stanza:up();
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66 end
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67 local parser = lxp.new(handler, "\1");
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68 local ok, err, line, col = parser:parse(xml);
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69 if ok then ok, err, line, col = parser:parse(); end
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70 --parser:close();
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71 if ok then
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72 return stanza.tags[1];
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73 else
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74 return ok, ("%s (line %d, col %d))"):format(err, line, col);
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75 end
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76 end;
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77 end)();
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78
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79 return {
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80 parse = parse_xml;
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81 };