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util/template.lua

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util/template.lua @ 9195:b6ffd4f951b9

util.pubsub: Add comment to clarify return values
author Matthew Wild <mwild1@gmail.com>
date Sat, 18 Aug 2018 13:23:52 +0100
parent 8555:4f0f5b49bb03
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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94ec474debf5 util.template: Silence luacheck warnings about unused loop vars
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1 -- luacheck: ignore 213/i
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2 local stanza_mt = require "util.stanza".stanza_mt;
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3 local setmetatable = setmetatable;
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4 local pairs = pairs;
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5 local ipairs = ipairs;
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6 local error = error;
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7 local envload = require "util.envload".envload;
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8 local debug = debug;
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9 local t_remove = table.remove;
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10 local parse_xml = require "util.xml".parse;
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11
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12 local _ENV = nil;
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13 -- luacheck: std none
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14
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15 local function trim_xml(stanza)
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16 for i=#stanza,1,-1 do
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17 local child = stanza[i];
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18 if child.name then
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19 trim_xml(child);
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20 else
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21 child = child:gsub("^%s*", ""):gsub("%s*$", "");
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22 stanza[i] = child;
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23 if child == "" then t_remove(stanza, i); end
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24 end
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25 end
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26 end
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27
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28 local function create_string_string(str)
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29 str = ("%q"):format(str);
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30 str = str:gsub("{([^}]*)}", function(s)
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31 return '"..(data["'..s..'"]or"").."';
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32 end);
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33 return str;
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34 end
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35 local function create_attr_string(attr, xmlns)
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36 local str = '{';
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37 for name,value in pairs(attr) do
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38 if name ~= "xmlns" or value ~= xmlns then
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39 str = str..("[%q]=%s;"):format(name, create_string_string(value));
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40 end
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41 end
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42 return str..'}';
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43 end
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44 local function create_clone_string(stanza, lookup, xmlns)
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45 if not lookup[stanza] then
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46 local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns));
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47 -- add tags
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48 for i,tag in ipairs(stanza.tags) do
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49 s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";";
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50 end
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51 s = s..'};';
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52 -- add children
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53 for i,child in ipairs(stanza) do
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54 if child.name then
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55 s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";";
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56 else
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57 s = s..create_string_string(child)..";"
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58 end
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59 end
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60 s = s..'}, stanza_mt)';
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61 s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings
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62 local n = #lookup + 1;
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63 lookup[n] = s;
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64 lookup[stanza] = "_"..n;
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65 end
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66 return lookup[stanza];
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67 end
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68 local function create_cloner(stanza, chunkname)
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69 local lookup = {};
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70 local name = create_clone_string(stanza, lookup, "");
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71 local src = "local setmetatable,stanza_mt=...;return function(data)";
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72 for i=1,#lookup do
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73 src = src.."local _"..i.."="..lookup[i]..";";
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74 end
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75 src = src.."return "..name..";end";
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76 local f,err = envload(src, chunkname);
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77 if not f then error(err); end
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78 return f(setmetatable, stanza_mt);
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79 end
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80
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81 local template_mt = { __tostring = function(t) return t.name end };
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82 local function create_template(templates, text)
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83 local stanza, err = parse_xml(text);
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84 if not stanza then error(err); end
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85 trim_xml(stanza);
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86
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87 local info = debug.getinfo(3, "Sl");
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88 info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
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89
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90 local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
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91 templates[text] = template;
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92 return template;
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93 end
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94
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95 local templates = setmetatable({}, { __mode = 'k', __index = create_template });
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96 return function(text)
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97 return templates[text];
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98 end;