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util/template.lua

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util/template.lua @ 4936:92c86e11fd44

util.stanza: Make stanza:childtags() behave like :get_child()
author Kim Alvefur <zash@zash.se>
date Thu, 05 Jul 2012 17:58:47 +0200
parent 4495:c0f5c78cb817
child 5214:1430c6f36621
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c85f9a4ae1c4 util.template: Initial commit. A template library for XML stanzas.
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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 setmetatable = setmetatable;
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5 local pairs = pairs;
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6 local ipairs = ipairs;
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7 local error = error;
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8 local loadstring = loadstring;
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9 local debug = debug;
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10 local t_remove = table.remove;
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12 module("template")
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13
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14 local parse_xml = (function()
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15 local ns_prefixes = {
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16 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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17 };
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18 local ns_separator = "\1";
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19 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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20 return function(xml)
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21 local handler = {};
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22 local stanza = st.stanza("root");
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23 function handler:StartElement(tagname, attr)
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24 local curr_ns,name = tagname:match(ns_pattern);
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25 if name == "" then
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26 curr_ns, name = "", curr_ns;
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27 end
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28 if curr_ns ~= "" then
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29 attr.xmlns = curr_ns;
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30 end
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31 for i=1,#attr do
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32 local k = attr[i];
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33 attr[i] = nil;
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34 local ns, nm = k:match(ns_pattern);
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35 if nm ~= "" then
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36 ns = ns_prefixes[ns];
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37 if ns then
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38 attr[ns..":"..nm] = attr[k];
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39 attr[k] = nil;
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40 end
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41 end
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42 end
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43 stanza:tag(name, attr);
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44 end
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45 function handler:CharacterData(data)
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46 stanza:text(data);
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47 end
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48 function handler:EndElement(tagname)
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49 stanza:up();
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50 end
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51 local parser = lxp.new(handler, "\1");
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52 local ok, err, line, col = parser:parse(xml);
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53 if ok then ok, err, line, col = parser:parse(); end
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54 --parser:close();
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55 if ok then
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56 return stanza.tags[1];
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57 else
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58 return ok, err.." (line "..line..", col "..col..")";
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59 end
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60 end;
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61 end)();
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62
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63 local function trim_xml(stanza)
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64 for i=#stanza,1,-1 do
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65 local child = stanza[i];
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66 if child.name then
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67 trim_xml(child);
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68 else
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69 child = child:gsub("^%s*", ""):gsub("%s*$", "");
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70 stanza[i] = child;
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71 if child == "" then t_remove(stanza, i); end
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72 end
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73 end
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74 end
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75
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76 local function create_string_string(str)
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77 str = ("%q"):format(str);
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78 str = str:gsub("{([^}]*)}", function(s)
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79 return '"..(data["'..s..'"]or"").."';
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80 end);
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81 return str;
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82 end
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83 local function create_attr_string(attr, xmlns)
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84 local str = '{';
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85 for name,value in pairs(attr) do
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86 if name ~= "xmlns" or value ~= xmlns then
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87 str = str..("[%q]=%s;"):format(name, create_string_string(value));
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88 end
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89 end
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90 return str..'}';
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91 end
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92 local function create_clone_string(stanza, lookup, xmlns)
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93 if not lookup[stanza] then
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94 local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns));
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95 -- add tags
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96 for i,tag in ipairs(stanza.tags) do
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97 s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";";
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98 end
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99 s = s..'};';
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100 -- add children
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101 for i,child in ipairs(stanza) do
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102 if child.name then
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103 s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";";
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104 else
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105 s = s..create_string_string(child)..";"
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106 end
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107 end
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108 s = s..'}, stanza_mt)';
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109 s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings
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110 local n = #lookup + 1;
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111 lookup[n] = s;
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112 lookup[stanza] = "_"..n;
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113 end
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114 return lookup[stanza];
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115 end
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116 local stanza_mt = st.stanza_mt;
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117 local function create_cloner(stanza, chunkname)
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118 local lookup = {};
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119 local name = create_clone_string(stanza, lookup, "");
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120 local f = "local setmetatable,stanza_mt=...;return function(data)";
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121 for i=1,#lookup do
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122 f = f.."local _"..i.."="..lookup[i]..";";
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123 end
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124 f = f.."return "..name..";end";
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125 local f,err = loadstring(f, chunkname);
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126 if not f then error(err); end
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127 return f(setmetatable, stanza_mt);
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128 end
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129
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130 local template_mt = { __tostring = function(t) return t.name end };
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131 local function create_template(templates, text)
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132 local stanza, err = parse_xml(text);
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133 if not stanza then error(err); end
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134 trim_xml(stanza);
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135
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136 local info = debug.getinfo(3, "Sl");
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137 info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
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138
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139 local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
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140 templates[text] = template;
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141 return template;
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142 end
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143
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144 local templates = setmetatable({}, { __mode = 'k', __index = create_template });
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145 return function(text)
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146 return templates[text];
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147 end;