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util/template.lua

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util/template.lua @ 4451:70275ab52ab2

configure: Add 'openbsd' preset (thanks xavier)
author Matthew Wild <mwild1@gmail.com>
date Sun, 11 Dec 2011 17:08:34 +0000
parent 3640:4bc88bb748d1
child 4495:c0f5c78cb817
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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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11 module("template")
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12
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13 local parse_xml = (function()
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14 local ns_prefixes = {
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15 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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16 };
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17 local ns_separator = "\1";
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18 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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19 return function(xml)
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20 local handler = {};
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21 local stanza = st.stanza("root");
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22 function handler:StartElement(tagname, attr)
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23 local curr_ns,name = tagname:match(ns_pattern);
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24 if name == "" then
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25 curr_ns, name = "", curr_ns;
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26 end
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27 if curr_ns ~= "" then
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28 attr.xmlns = curr_ns;
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29 end
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30 for i=1,#attr do
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31 local k = attr[i];
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32 attr[i] = nil;
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33 local ns, nm = k:match(ns_pattern);
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34 if nm ~= "" then
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35 ns = ns_prefixes[ns];
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36 if ns then
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37 attr[ns..":"..nm] = attr[k];
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38 attr[k] = nil;
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39 end
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40 end
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41 end
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42 stanza:tag(name, attr);
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43 end
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44 function handler:CharacterData(data)
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45 data = data:gsub("^%s*", ""):gsub("%s*$", "");
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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 create_string_string(str)
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64 str = ("%q"):format(str);
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65 str = str:gsub("{([^}]*)}", function(s)
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66 return '"..(data["'..s..'"]or"").."';
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67 end);
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68 return str;
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69 end
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70 local function create_attr_string(attr, xmlns)
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71 local str = '{';
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72 for name,value in pairs(attr) do
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73 if name ~= "xmlns" or value ~= xmlns then
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74 str = str..("[%q]=%s;"):format(name, create_string_string(value));
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75 end
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76 end
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77 return str..'}';
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78 end
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79 local function create_clone_string(stanza, lookup, xmlns)
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80 if not lookup[stanza] then
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81 local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns));
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82 -- add tags
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83 for i,tag in ipairs(stanza.tags) do
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84 s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";";
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85 end
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86 s = s..'};';
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87 -- add children
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88 for i,child in ipairs(stanza) do
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89 if child.name then
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90 s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";";
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91 else
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92 s = s..create_string_string(child)..";"
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93 end
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94 end
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95 s = s..'}, stanza_mt)';
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96 s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings
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97 local n = #lookup + 1;
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98 lookup[n] = s;
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99 lookup[stanza] = "_"..n;
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100 end
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101 return lookup[stanza];
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102 end
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103 local stanza_mt = st.stanza_mt;
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104 local function create_cloner(stanza, chunkname)
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105 local lookup = {};
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106 local name = create_clone_string(stanza, lookup, "");
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107 local f = "local setmetatable,stanza_mt=...;return function(data)";
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108 for i=1,#lookup do
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109 f = f.."local _"..i.."="..lookup[i]..";";
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110 end
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111 f = f.."return "..name..";end";
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112 local f,err = loadstring(f, chunkname);
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113 if not f then error(err); end
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114 return f(setmetatable, stanza_mt);
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115 end
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116
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117 local template_mt = { __tostring = function(t) return t.name end };
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118 local function create_template(templates, text)
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119 local stanza, err = parse_xml(text);
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120 if not stanza then error(err); end
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121
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122 local info = debug.getinfo(3, "Sl");
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123 info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
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124
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125 local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
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126 templates[text] = template;
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127 return template;
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128 end
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129
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130 local templates = setmetatable({}, { __mode = 'k', __index = create_template });
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131 return function(text)
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132 return templates[text];
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133 end;