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28f5c8061dad
util/xml.lua

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util/xml.lua @ 11922:28f5c8061dad

net.server_epoll: Fix streaming downloads (thanks Menel) ff4e34c448a4 broke the way net.http.server streams downloads from disk because it made writes from the ondrain callback no longer reset the want-write flag, causing the download to halt. Writes from the predrain handler still must not trigger anything but additions to the buffer, since it is about to do all the socket writing already.
author Kim Alvefur <zash@zash.se>
date Fri, 19 Nov 2021 15:45:01 +0100
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 };