prosody
0.12.3
teal-src/util/xtemplate.tl

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teal-src/util/xtemplate.tl @ 12894:0598d822614f 0.12 0.12.3

mod_websocket: Fire pre-session-close event (fixes #1800) This event was added in a7c183bb4e64 and is required to make mod_smacks know that a session was intentionally closed and shouldn't be hibernated (see fcea4d9e7502). Because this was missing from mod_websocket's session.close(), mod_smacks would always attempt to hibernate websocket sessions even if they closed cleanly. That mod_websocket has its own copy of session.close() is something to fix another day (probably not in the stable branch). So for now this commit makes the minimal change to get things working again. Thanks to Damian and the Jitsi team for reporting.
author Matthew Wild <mwild1@gmail.com>
date Mon, 20 Feb 2023 18:10:15 +0000
parent 12213:dc9d63166488
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12213
dc9d63166488 util.xtemplate: Yet another string template library
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1 -- render(template, stanza) --> string
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2 -- {path} --> stanza:find(path)
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3 -- {{ns}name/child|each({ns}name){sub-template}}
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4
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5 --[[
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6 template ::= "{" path ("|" name ("(" args ")")? (template)? )* "}"
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7 path ::= defined by util.stanza
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8 name ::= %w+
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9 args ::= anything with balanced ( ) pairs
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10 ]]
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11
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12 local s_gsub = string.gsub;
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13 local s_match = string.match;
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14 local s_sub = string.sub;
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15 local t_concat = table.concat;
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16
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17 local st = require "util.stanza";
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18
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19 local type escape_t = function (string) : string
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20 local type filter_t = function (string, string | st.stanza_t, string) : string | st.stanza_t, boolean
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21 local type filter_coll = { string : filter_t }
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22
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23 local function render(template : string, root : st.stanza_t, escape : escape_t, filters : filter_coll) : string
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24 escape = escape or st.xml_escape;
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25
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26 return (s_gsub(template, "%b{}", function(block : string) : string
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27 local inner = s_sub(block, 2, -2);
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28 local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()");
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29 if not path is string then return end
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30 local value : string | st.stanza_t
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31 if path == "." then
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32 value = root;
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33 elseif path == "#" then
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34 value = root:get_text();
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35 else
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36 value = root:find(path);
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37 end
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38 local is_escaped = false;
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39
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40 while pipe == "|" do
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41 local func, args, tmpl, p = s_match(inner, "^(%w+)(%b())(%b{})()", pos as integer);
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42 if not func then func, args, p = s_match(inner, "^(%w+)(%b())()", pos as integer); end
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43 if not func then func, tmpl, p = s_match(inner, "^(%w+)(%b{})()", pos as integer); end
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44 if not func then func, p = s_match(inner, "^(%w+)()", pos as integer); end
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45 if not func then break end
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46 if tmpl then tmpl = s_sub(tmpl, 2, -2); end
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47 if args then args = s_sub(args, 2, -2); end
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48
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49 if func == "each" and tmpl and st.is_stanza(value) then
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50 if not args then value, args = root, path; end
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51 local ns, name = s_match(args, "^(%b{})(.*)$");
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52 if ns then ns = s_sub(ns, 2, -2); else name, ns = args, nil; end
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53 if ns == "" then ns = nil; end
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54 if name == "" then name = nil; end
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55 local out, i = {}, 1;
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56 for c in (value as st.stanza_t):childtags(name, ns) do
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57 out[i], i = render(tmpl, c, escape, filters), i + 1;
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58 end
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59 value = t_concat(out);
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60 is_escaped = true;
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61 elseif func == "and" and tmpl then
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62 local condition = value;
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63 if args then condition = root:find(args); end
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64 if condition then
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65 value = render(tmpl, root, escape, filters);
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66 is_escaped = true;
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67 end
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68 elseif func == "or" and tmpl then
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69 local condition = value;
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70 if args then condition = root:find(args); end
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71 if not condition then
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72 value = render(tmpl, root, escape, filters);
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73 is_escaped = true;
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74 end
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75 elseif filters and filters[func] then
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76 local f = filters[func];
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77 if args == nil then
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78 value, is_escaped = f(value, tmpl);
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79 else
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80 value, is_escaped = f(args, value, tmpl);
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81 end
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82 else
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83 error("No such filter function: " .. func);
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84 end
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85 pipe, pos = s_match(inner, "^(|?)()", p as integer);
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86 end
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87
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88 if value is string then
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89 if not is_escaped then value = escape(value); end
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90 return value;
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91 elseif st.is_stanza(value) then
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92 value = value:get_text();
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93 if value then
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94 return escape(value);
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95 end
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96 end
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97 return "";
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98 end));
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99 end
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100
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101 return { render = render };