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-rw-r--r--fallbacks/lxp.lua298
1 files changed, 149 insertions, 149 deletions
diff --git a/fallbacks/lxp.lua b/fallbacks/lxp.lua
index 21cab4af..6d3297d1 100644
--- a/fallbacks/lxp.lua
+++ b/fallbacks/lxp.lua
@@ -1,149 +1,149 @@
-
-local coroutine = coroutine;
-local tonumber = tonumber;
-local string = string;
-local setmetatable, getmetatable = setmetatable, getmetatable;
-local pairs = pairs;
-
-local deadroutine = coroutine.create(function() end);
-coroutine.resume(deadroutine);
-
-module("lxp")
-
-local entity_map = setmetatable({
- ["amp"] = "&";
- ["gt"] = ">";
- ["lt"] = "<";
- ["apos"] = "'";
- ["quot"] = "\"";
-}, {__index = function(_, s)
- if s:sub(1,1) == "#" then
- if s:sub(2,2) == "x" then
- return string.char(tonumber(s:sub(3), 16));
- else
- return string.char(tonumber(s:sub(2)));
- end
- end
- end
-});
-local function xml_unescape(str)
- return (str:gsub("&(.-);", entity_map));
-end
-local function parse_tag(s)
- local name,sattr=(s):gmatch("([^%s]+)(.*)")();
- local attr = {};
- for a,b in (sattr):gmatch("([^=%s]+)=['\"]([^'\"]*)['\"]") do attr[a] = xml_unescape(b); end
- return name, attr;
-end
-
-local function parser(data, handlers, ns_separator)
- local function read_until(str)
- local pos = data:find(str, nil, true);
- while not pos do
- data = data..coroutine.yield();
- pos = data:find(str, nil, true);
- end
- local r = data:sub(1, pos);
- data = data:sub(pos+1);
- return r;
- end
- local function read_before(str)
- local pos = data:find(str, nil, true);
- while not pos do
- data = data..coroutine.yield();
- pos = data:find(str, nil, true);
- end
- local r = data:sub(1, pos-1);
- data = data:sub(pos);
- return r;
- end
- local function peek()
- while #data == 0 do data = coroutine.yield(); end
- return data:sub(1,1);
- end
-
- local ns = { xml = "http://www.w3.org/XML/1998/namespace" };
- ns.__index = ns;
- local function apply_ns(name, dodefault)
- local prefix,n = name:match("^([^:]*):(.*)$");
- if prefix and ns[prefix] then
- return ns[prefix]..ns_separator..n;
- end
- if dodefault and ns[""] then
- return ns[""]..ns_separator..name;
- end
- return name;
- end
- local function push(tag, attr)
- ns = setmetatable({}, ns);
- for k,v in pairs(attr) do
- local xmlns = k == "xmlns" and "" or k:match("^xmlns:(.*)$");
- if xmlns then
- ns[xmlns] = v;
- attr[k] = nil;
- end
- end
- local newattr, n = {}, 0;
- for k,v in pairs(attr) do
- n = n+1;
- k = apply_ns(k);
- newattr[n] = k;
- newattr[k] = v;
- end
- tag = apply_ns(tag, true);
- ns[0] = tag;
- ns.__index = ns;
- return tag, newattr;
- end
- local function pop()
- local tag = ns[0];
- ns = getmetatable(ns);
- return tag;
- end
-
- while true do
- if peek() == "<" then
- local elem = read_until(">"):sub(2,-2);
- if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
- elseif elem:sub(1,1) == "/" then -- end tag
- elem = elem:sub(2);
- local name = pop();
- handlers:EndElement(name); -- TODO check for start-end tag name match
- elseif elem:sub(-1,-1) == "/" then -- empty tag
- elem = elem:sub(1,-2);
- local name,attr = parse_tag(elem);
- name,attr = push(name,attr);
- handlers:StartElement(name,attr);
- name = pop();
- handlers:EndElement(name);
- else -- start tag
- local name,attr = parse_tag(elem);
- name,attr = push(name,attr);
- handlers:StartElement(name,attr);
- end
- else
- local text = read_before("<");
- handlers:CharacterData(xml_unescape(text));
- end
- end
-end
-
-function new(handlers, ns_separator)
- local co = coroutine.create(parser);
- return {
- parse = function(self, data)
- if not data then
- co = deadroutine;
- return true; -- eof
- end
- local success, result = coroutine.resume(co, data, handlers, ns_separator);
- if result then
- co = deadroutine;
- return nil, result; -- error
- end
- return true; -- success
- end;
- };
-end
-
-return _M;
+
+local coroutine = coroutine;
+local tonumber = tonumber;
+local string = string;
+local setmetatable, getmetatable = setmetatable, getmetatable;
+local pairs = pairs;
+
+local deadroutine = coroutine.create(function() end);
+coroutine.resume(deadroutine);
+
+module("lxp")
+
+local entity_map = setmetatable({
+ ["amp"] = "&";
+ ["gt"] = ">";
+ ["lt"] = "<";
+ ["apos"] = "'";
+ ["quot"] = "\"";
+}, {__index = function(_, s)
+ if s:sub(1,1) == "#" then
+ if s:sub(2,2) == "x" then
+ return string.char(tonumber(s:sub(3), 16));
+ else
+ return string.char(tonumber(s:sub(2)));
+ end
+ end
+ end
+});
+local function xml_unescape(str)
+ return (str:gsub("&(.-);", entity_map));
+end
+local function parse_tag(s)
+ local name,sattr=(s):gmatch("([^%s]+)(.*)")();
+ local attr = {};
+ for a,b in (sattr):gmatch("([^=%s]+)=['\"]([^'\"]*)['\"]") do attr[a] = xml_unescape(b); end
+ return name, attr;
+end
+
+local function parser(data, handlers, ns_separator)
+ local function read_until(str)
+ local pos = data:find(str, nil, true);
+ while not pos do
+ data = data..coroutine.yield();
+ pos = data:find(str, nil, true);
+ end
+ local r = data:sub(1, pos);
+ data = data:sub(pos+1);
+ return r;
+ end
+ local function read_before(str)
+ local pos = data:find(str, nil, true);
+ while not pos do
+ data = data..coroutine.yield();
+ pos = data:find(str, nil, true);
+ end
+ local r = data:sub(1, pos-1);
+ data = data:sub(pos);
+ return r;
+ end
+ local function peek()
+ while #data == 0 do data = coroutine.yield(); end
+ return data:sub(1,1);
+ end
+
+ local ns = { xml = "http://www.w3.org/XML/1998/namespace" };
+ ns.__index = ns;
+ local function apply_ns(name, dodefault)
+ local prefix,n = name:match("^([^:]*):(.*)$");
+ if prefix and ns[prefix] then
+ return ns[prefix]..ns_separator..n;
+ end
+ if dodefault and ns[""] then
+ return ns[""]..ns_separator..name;
+ end
+ return name;
+ end
+ local function push(tag, attr)
+ ns = setmetatable({}, ns);
+ for k,v in pairs(attr) do
+ local xmlns = k == "xmlns" and "" or k:match("^xmlns:(.*)$");
+ if xmlns then
+ ns[xmlns] = v;
+ attr[k] = nil;
+ end
+ end
+ local newattr, n = {}, 0;
+ for k,v in pairs(attr) do
+ n = n+1;
+ k = apply_ns(k);
+ newattr[n] = k;
+ newattr[k] = v;
+ end
+ tag = apply_ns(tag, true);
+ ns[0] = tag;
+ ns.__index = ns;
+ return tag, newattr;
+ end
+ local function pop()
+ local tag = ns[0];
+ ns = getmetatable(ns);
+ return tag;
+ end
+
+ while true do
+ if peek() == "<" then
+ local elem = read_until(">"):sub(2,-2);
+ if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
+ elseif elem:sub(1,1) == "/" then -- end tag
+ elem = elem:sub(2);
+ local name = pop();
+ handlers:EndElement(name); -- TODO check for start-end tag name match
+ elseif elem:sub(-1,-1) == "/" then -- empty tag
+ elem = elem:sub(1,-2);
+ local name,attr = parse_tag(elem);
+ name,attr = push(name,attr);
+ handlers:StartElement(name,attr);
+ name = pop();
+ handlers:EndElement(name);
+ else -- start tag
+ local name,attr = parse_tag(elem);
+ name,attr = push(name,attr);
+ handlers:StartElement(name,attr);
+ end
+ else
+ local text = read_before("<");
+ handlers:CharacterData(xml_unescape(text));
+ end
+ end
+end
+
+function new(handlers, ns_separator)
+ local co = coroutine.create(parser);
+ return {
+ parse = function(self, data)
+ if not data then
+ co = deadroutine;
+ return true; -- eof
+ end
+ local success, result = coroutine.resume(co, data, handlers, ns_separator);
+ if result then
+ co = deadroutine;
+ return nil, result; -- error
+ end
+ return true; -- success
+ end;
+ };
+end
+
+return _M;
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