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util/xml.lua

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util/xml.lua @ 11272:44c9cb4094bb

mod_mam: Add support for before-id and after-id fields
author Kim Alvefur <zash@zash.se>
date Sat, 09 Jan 2021 21:31:45 +0100
parent 11127:1d9cd1abc660
child 12121:2162e86029b6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 };