prosody
ca041359c045
util/xtemplate.lua

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util/xtemplate.lua @ 13571:ca041359c045

net.server_epoll: Don't try to flush buffer on closed connections Attempt to fix a bug where connections are somehow closed twice, leading to bad things happening elsewhere. With LuaSec, closed connections are generally already too closed to write anything to anyway since it does not support unidirectional shutdown.
author Kim Alvefur <zash@zash.se>
date Tue, 19 Nov 2024 00:41:02 +0100
parent 13525:0f7e7311eebf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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dc9d63166488 util.xtemplate: Yet another string template library
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1 local s_gsub = string.gsub;
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2 local s_match = string.match;
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3 local s_sub = string.sub;
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4 local t_concat = table.concat;
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5
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6 local st = require("prosody.util.stanza");
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7
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8 local function render(template, root, escape, filters)
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9 escape = escape or st.xml_escape;
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10
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11 return (s_gsub(template, "(%s*)(%b{})(%s*)", function(pre_blank, block, post_blank)
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12 local inner = s_sub(block, 2, -2);
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13 if inner:sub(1, 1) == "-" then
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14 pre_blank = "";
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15 inner = inner:sub(2);
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16 end
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17 if inner:sub(-1, -1) == "-" then
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18 post_blank = "";
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19 inner = inner:sub(1, -2);
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20 end
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21 local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()");
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22 if not (type(path) == "string") then return end
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23 local value
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24 if path == "." then
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25 value = root;
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26 elseif path == "#" then
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27 value = root:get_text();
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28 else
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29 value = root:find(path);
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30 end
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31 local is_escaped = false;
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32
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33 while pipe == "|" do
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34 local func, args, tmpl, p = s_match(inner, "^(%w+)(%b())(%b{})()", pos);
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35 if not func then func, args, p = s_match(inner, "^(%w+)(%b())()", pos); end
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36 if not func then func, tmpl, p = s_match(inner, "^(%w+)(%b{})()", pos); end
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37 if not func then func, p = s_match(inner, "^(%w+)()", pos); end
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38 if not func then break end
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39 if tmpl then tmpl = s_sub(tmpl, 2, -2); end
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40 if args then args = s_sub(args, 2, -2); end
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41
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42 if func == "each" and tmpl then
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43 if not st.is_stanza(value) then return pre_blank .. post_blank end
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44 if not args then value, args = root, path; end
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45 local ns, name = s_match(args, "^(%b{})(.*)$");
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46 if ns then
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47 ns = s_sub(ns, 2, -2);
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48 else
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49 name, ns = args, nil;
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50 end
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51 if ns == "" then ns = nil; end
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52 if name == "" then name = nil; end
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53 local out, i = {}, 1;
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54 for c in (value):childtags(name, ns) do out[i], i = render(tmpl, c, escape, filters), i + 1; end
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55 value = t_concat(out);
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56 is_escaped = true;
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57 elseif func == "and" and tmpl then
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58 local condition = value;
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59 if args then condition = root:find(args); end
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60 if condition then
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61 value = render(tmpl, root, escape, filters);
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62 is_escaped = true;
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63 end
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64 elseif func == "or" and tmpl then
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65 local condition = value;
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66 if args then condition = root:find(args); end
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67 if not condition then
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68 value = render(tmpl, root, escape, filters);
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69 is_escaped = true;
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70 end
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71 elseif filters and filters[func] then
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72 local f = filters[func];
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73 value, is_escaped = f(value, args, tmpl);
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74 else
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75 error("No such filter function: " .. func);
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76 end
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77 pipe, pos = s_match(inner, "^(|?)()", p);
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78 end
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79
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80 if type(value) == "string" then
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81 if not is_escaped then value = escape(value); end
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82 return pre_blank .. value .. post_blank
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83 elseif st.is_stanza(value) then
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84 value = value:get_text();
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85 if value then return pre_blank .. escape(value) .. post_blank end
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86 end
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87 return pre_blank .. post_blank
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88 end))
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89 end
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90
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91 return { render = render }