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util/template.lua

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util/template.lua @ 3617:26c9ba8f309c

mod_component: Use module:get_option() instead of configmanager.
author Waqas Hussain <waqas20@gmail.com>
date Fri, 12 Nov 2010 23:35:02 +0500
parent 3546:cb1600dea3ad
child 3637:bd491def3efb
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c85f9a4ae1c4 util.template: Initial commit. A template library for XML stanzas.
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1
c85f9a4ae1c4 util.template: Initial commit. A template library for XML stanzas.
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2 local t_insert = table.insert;
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3 local st = require "util.stanza";
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4 local lxp = require "lxp";
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5 local setmetatable = setmetatable;
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6 local pairs = pairs;
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7 local error = error;
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8 local s_gsub = string.gsub;
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9
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10 local print = print;
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12 module("template")
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13
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14 local function process_stanza(stanza, ops)
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15 -- process attrs
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16 for key, val in pairs(stanza.attr) do
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17 if val:match("{[^}]*}") then
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18 t_insert(ops, {stanza.attr, key, val});
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19 end
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20 end
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21 -- process children
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22 local i = 1;
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23 while i <= #stanza do
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24 local child = stanza[i];
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25 if child.name then
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26 process_stanza(child, ops);
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27 elseif child:match("^{[^}]*}$") then -- text
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28 t_insert(ops, {stanza, i, child:match("^{([^}]*)}$"), true});
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29 elseif child:match("{[^}]*}") then -- text
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30 t_insert(ops, {stanza, i, child});
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31 end
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32 i = i + 1;
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33 end
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34 end
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35
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36 local parse_xml = (function()
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37 local ns_prefixes = {
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38 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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39 };
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40 local ns_separator = "\1";
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41 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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42 return function(xml)
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43 local handler = {};
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44 local stanza = st.stanza("root");
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45 function handler:StartElement(tagname, attr)
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46 local curr_ns,name = tagname:match(ns_pattern);
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47 if name == "" then
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48 curr_ns, name = "", curr_ns;
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49 end
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50 if curr_ns ~= "" then
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51 attr.xmlns = curr_ns;
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52 end
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53 for i=1,#attr do
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54 local k = attr[i];
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55 attr[i] = nil;
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56 local ns, nm = k:match(ns_pattern);
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57 if nm ~= "" then
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58 ns = ns_prefixes[ns];
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59 if ns then
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60 attr[ns..":"..nm] = attr[k];
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61 attr[k] = nil;
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62 end
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63 end
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64 end
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65 stanza:tag(name, attr);
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66 end
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67 function handler:CharacterData(data)
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68 data = data:gsub("^%s*", ""):gsub("%s*$", "");
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69 stanza:text(data);
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70 end
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71 function handler:EndElement(tagname)
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72 stanza:up();
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73 end
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74 local parser = lxp.new(handler, "\1");
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75 local ok, err, line, col = parser:parse(xml);
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76 if ok then ok, err, line, col = parser:parse(); end
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77 --parser:close();
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78 if ok then
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79 return stanza.tags[1];
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80 else
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81 return ok, err.." (line "..line..", col "..col..")";
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82 end
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83 end;
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84 end)();
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85
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86 local stanza_mt = st.stanza_mt;
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87 local function fast_st_clone(stanza, lookup)
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88 local stanza_attr = stanza.attr;
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89 local stanza_tags = stanza.tags;
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90 local tags, attr = {}, {};
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91 local clone = { name = stanza.name, attr = attr, tags = tags, last_add = {} };
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92 for k,v in pairs(stanza_attr) do attr[k] = v; end
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93 lookup[stanza_attr] = attr;
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94 for i=1,#stanza_tags do
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95 local child = stanza_tags[i];
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96 local new = fast_st_clone(child, lookup);
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97 tags[i] = new;
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98 lookup[child] = new;
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99 end
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100 for i=1,#stanza do
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101 local child = stanza[i];
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102 clone[i] = lookup[child] or child;
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103 end
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104 return setmetatable(clone, stanza_mt);
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105 end
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106
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107 local function create_template(text)
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108 local stanza, err = parse_xml(text);
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109 if not stanza then error(err); end
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110 local ops = {};
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111 process_stanza(stanza, ops);
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112
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113 local template = {};
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114 local lookup = {};
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115 function template.apply(data)
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116 local newstanza = fast_st_clone(stanza, lookup);
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117 for i=1,#ops do
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118 local op = ops[i];
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119 local t, k, v, g = op[1], op[2], op[3], op[4];
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120 if g then
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121 lookup[t][k] = data[v];
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122 else
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123 lookup[t][k] = s_gsub(v, "{([^}]*)}", data);
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124 end
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125 end
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126 return newstanza;
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127 end
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128 return template;
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129 end
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130
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131 local templates = setmetatable({}, { __mode = 'k' });
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132 return function(text)
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133 local template = templates[text];
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134 if not template then
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135 template = create_template(text);
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136 templates[text] = template;
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137 end
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138 return template;
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139 end;