prosody
d6545c533ce2
util/xtemplate.lua

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util/xtemplate.lua @ 13547:d6545c533ce2 0.12

mod_bookmarks: Clarify log messages on failure to sync to modern PEP bookmarks Previously the error messages said that it failed to "publish" to PEP, but sometimes a sync involves removing items, which can be confusing. The log was also the same for both legacy PEP and private XML bookmarks. Having different log messages makes it easier to debug the cause and location of any sync errors.
author Matthew Wild <mwild1@gmail.com>
date Fri, 08 Nov 2024 10:28:29 +0000
parent 13500:997d9ad12477
child 13501:05f028de4c45
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("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, "%b{}", function(block)
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12 local inner = s_sub(block, 2, -2);
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13 local path, pipe, pos = s_match(inner, "^([^|]+)(|?)()");
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14 if not (type(path) == "string") then return end
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15 local value
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16 if path == "." then
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17 value = root;
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18 elseif path == "#" then
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19 value = root:get_text();
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20 else
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21 value = root:find(path);
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22 end
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23 local is_escaped = false;
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24
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25 while pipe == "|" do
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26 local func, args, tmpl, p = s_match(inner, "^(%w+)(%b())(%b{})()", pos);
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27 if not func then func, args, p = s_match(inner, "^(%w+)(%b())()", pos); end
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28 if not func then func, tmpl, p = s_match(inner, "^(%w+)(%b{})()", pos); end
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29 if not func then func, p = s_match(inner, "^(%w+)()", pos); end
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30 if not func then break end
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31 if tmpl then tmpl = s_sub(tmpl, 2, -2); end
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32 if args then args = s_sub(args, 2, -2); end
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33
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997d9ad12477 util.xtemplate: Fix error on applying each() to zero stanzas
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34 if func == "each" and tmpl then
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35 if not st.is_stanza(value) then return "" end
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36 if not args then value, args = root, path; end
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37 local ns, name = s_match(args, "^(%b{})(.*)$");
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38 if ns then
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39 ns = s_sub(ns, 2, -2);
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40 else
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41 name, ns = args, nil;
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42 end
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43 if ns == "" then ns = nil; end
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44 if name == "" then name = nil; end
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45 local out, i = {}, 1;
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46 for c in (value):childtags(name, ns) do out[i], i = render(tmpl, c, escape, filters), i + 1; end
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47 value = t_concat(out);
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48 is_escaped = true;
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49 elseif func == "and" and tmpl then
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50 local condition = value;
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51 if args then condition = root:find(args); end
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52 if condition then
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53 value = render(tmpl, root, escape, filters);
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54 is_escaped = true;
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55 end
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56 elseif func == "or" and tmpl then
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57 local condition = value;
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58 if args then condition = root:find(args); end
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59 if not condition then
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60 value = render(tmpl, root, escape, filters);
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61 is_escaped = true;
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62 end
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63 elseif filters and filters[func] then
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64 local f = filters[func];
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65 if args == nil then
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66 value, is_escaped = f(value, tmpl);
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67 else
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68 value, is_escaped = f(args, value, tmpl);
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69 end
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70 else
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71 error("No such filter function: " .. func);
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72 end
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73 pipe, pos = s_match(inner, "^(|?)()", p);
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74 end
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75
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76 if type(value) == "string" then
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77 if not is_escaped then value = escape(value); end
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78 return value
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79 elseif st.is_stanza(value) then
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80 value = value:get_text();
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81 if value then return escape(value) end
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82 end
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83 return ""
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84 end))
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85 end
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86
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87 return { render = render }