Mercurial > lxmppd-hg-xmllex / file comparison
comparison: fallbacks/lxp.lua
fallbacks/lxp.lua
- changeset 3804
- da75eb23dbba
- child 3899
- eff0c5fe9119
equal
deleted
inserted
replaced
| 3803:6e2d834e602c | 3804:da75eb23dbba |
|---|---|
| 1 | |
| 2 local coroutine = coroutine; | |
| 3 local tonumber = tonumber; | |
| 4 local string = string; | |
| 5 local setmetatable, getmetatable = setmetatable, getmetatable; | |
| 6 local pairs = pairs; | |
| 7 | |
| 8 local deadroutine = coroutine.create(function() end); | |
| 9 coroutine.resume(deadroutine); | |
| 10 | |
| 11 module("lxp") | |
| 12 | |
| 13 local entity_map = setmetatable({ | |
| 14 ["amp"] = "&"; | |
| 15 ["gt"] = ">"; | |
| 16 ["lt"] = "<"; | |
| 17 ["apos"] = "'"; | |
| 18 ["quot"] = "\""; | |
| 19 }, {__index = function(_, s) | |
| 20 if s:sub(1,1) == "#" then | |
| 21 if s:sub(2,2) == "x" then | |
| 22 return string.char(tonumber(s:sub(3), 16)); | |
| 23 else | |
| 24 return string.char(tonumber(s:sub(2))); | |
| 25 end | |
| 26 end | |
| 27 end | |
| 28 }); | |
| 29 local function xml_unescape(str) | |
| 30 return (str:gsub("&(.-);", entity_map)); | |
| 31 end | |
| 32 local function parse_tag(s) | |
| 33 local name,sattr=(s):gmatch("([^%s]+)(.*)")(); | |
| 34 local attr = {}; | |
| 35 for a,b in (sattr):gmatch("([^=%s]+)=['\"]([^'\"]*)['\"]") do attr[a] = xml_unescape(b); end | |
| 36 return name, attr; | |
| 37 end | |
| 38 | |
| 39 local function parser(data, handlers, ns_separator) | |
| 40 local function read_until(str) | |
| 41 local pos = data:find(str, nil, true); | |
| 42 while not pos do | |
| 43 data = data..coroutine.yield(); | |
| 44 pos = data:find(str, nil, true); | |
| 45 end | |
| 46 local r = data:sub(1, pos); | |
| 47 data = data:sub(pos+1); | |
| 48 return r; | |
| 49 end | |
| 50 local function read_before(str) | |
| 51 local pos = data:find(str, nil, true); | |
| 52 while not pos do | |
| 53 data = data..coroutine.yield(); | |
| 54 pos = data:find(str, nil, true); | |
| 55 end | |
| 56 local r = data:sub(1, pos-1); | |
| 57 data = data:sub(pos); | |
| 58 return r; | |
| 59 end | |
| 60 local function peek() | |
| 61 while #data == 0 do data = coroutine.yield(); end | |
| 62 return data:sub(1,1); | |
| 63 end | |
| 64 | |
| 65 local ns = { xml = "http://www.w3.org/XML/1998/namespace" }; | |
| 66 ns.__index = ns; | |
| 67 local function apply_ns(name, dodefault) | |
| 68 local prefix,n = name:match("^([^:]*):(.*)$"); | |
| 69 if prefix and ns[prefix] then | |
| 70 return ns[prefix]..ns_separator..n; | |
| 71 end | |
| 72 if dodefault and ns[""] then | |
| 73 return ns[""]..ns_separator..name; | |
| 74 end | |
| 75 return name; | |
| 76 end | |
| 77 local function push(tag, attr) | |
| 78 ns = setmetatable({}, ns); | |
| 79 for k,v in pairs(attr) do | |
| 80 local xmlns = k == "xmlns" and "" or k:match("^xmlns:(.*)$"); | |
| 81 if xmlns then | |
| 82 ns[xmlns] = v; | |
| 83 attr[k] = nil; | |
| 84 end | |
| 85 end | |
| 86 local newattr, n = {}, 0; | |
| 87 for k,v in pairs(attr) do | |
| 88 n = n+1; | |
| 89 k = apply_ns(k); | |
| 90 newattr[n] = k; | |
| 91 newattr[k] = v; | |
| 92 end | |
| 93 tag = apply_ns(tag, true); | |
| 94 ns[0] = tag; | |
| 95 ns.__index = ns; | |
| 96 return tag, newattr; | |
| 97 end | |
| 98 local function pop() | |
| 99 local tag = ns[0]; | |
| 100 ns = getmetatable(ns); | |
| 101 return tag; | |
| 102 end | |
| 103 | |
| 104 while true do | |
| 105 if peek() == "<" then | |
| 106 local elem = read_until(">"):sub(2,-2); | |
| 107 if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions | |
| 108 elseif elem:sub(1,1) == "/" then -- end tag | |
| 109 elem = elem:sub(2); | |
| 110 local name = pop(); | |
| 111 handlers:EndElement(name); -- TODO check for start-end tag name match | |
| 112 elseif elem:sub(-1,-1) == "/" then -- empty tag | |
| 113 elem = elem:sub(1,-2); | |
| 114 local name,attr = parse_tag(elem); | |
| 115 name,attr = push(name,attr); | |
| 116 handlers:StartElement(name,attr); | |
| 117 name = pop(); | |
| 118 handlers:EndElement(name); | |
| 119 else -- start tag | |
| 120 local name,attr = parse_tag(elem); | |
| 121 name,attr = push(name,attr); | |
| 122 handlers:StartElement(name,attr); | |
| 123 end | |
| 124 else | |
| 125 local text = read_before("<"); | |
| 126 handlers:CharacterData(xml_unescape(text)); | |
| 127 end | |
| 128 end | |
| 129 end | |
| 130 | |
| 131 function new(handlers, ns_separator) | |
| 132 local co = coroutine.create(parser); | |
| 133 return { | |
| 134 parse = function(self, data) | |
| 135 if not data then | |
| 136 co = deadroutine; | |
| 137 return true; -- eof | |
| 138 end | |
| 139 local success, result = coroutine.resume(co, data, handlers, ns_separator); | |
| 140 if result then | |
| 141 co = deadroutine; | |
| 142 return nil, result; -- error | |
| 143 end | |
| 144 return true; -- success | |
| 145 end; | |
| 146 }; | |
| 147 end | |
| 148 | |
| 149 return _M; |
