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comparison util/json.lua @ 5561:52eef11cd8af

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util.json: Optimize long string parsing.
author Waqas Hussain <waqas20@gmail.com>
date Sun, 05 May 2013 15:02:33 -0400
parents 9d7349bbe4d2
children a6b8fb827e2a
comparison
equal deleted inserted replaced
5553:7baf59444b31 5561:52eef11cd8af
256 checkandskip(c); 256 checkandskip(c);
257 end 257 end
258 return val; 258 return val;
259 end 259 end
260 local function readstring() 260 local function readstring()
261 local s = ""; 261 local s = {};
262 checkandskip("\""); 262 checkandskip("\"");
263 while ch do 263 while ch do
264 while ch and ch ~= "\\" and ch ~= "\"" do 264 while ch and ch ~= "\\" and ch ~= "\"" do
265 s = s..ch; next(); 265 t_insert(s, ch); next();
266 end 266 end
267 if ch == "\\" then 267 if ch == "\\" then
268 next(); 268 next();
269 if unescapes[ch] then 269 if unescapes[ch] then
270 s = s..unescapes[ch]; 270 t_insert(s, unescapes[ch]);
271 next(); 271 next();
272 elseif ch == "u" then 272 elseif ch == "u" then
273 local seq = ""; 273 local seq = "";
274 for i=1,4 do 274 for i=1,4 do
275 next(); 275 next();
276 if not ch then error("unexpected eof in string"); end 276 if not ch then error("unexpected eof in string"); end
277 if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end 277 if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
278 seq = seq..ch; 278 seq = seq..ch;
279 end 279 end
280 s = s..codepoint_to_utf8(tonumber(seq, 16)); 280 t_insert(s, codepoint_to_utf8(tonumber(seq, 16)));
281 next(); 281 next();
282 else error("invalid escape sequence in string"); end 282 else error("invalid escape sequence in string"); end
283 end 283 end
284 if ch == "\"" then 284 if ch == "\"" then
285 next(); 285 next();
286 return s; 286 return t_concat(s);
287 end 287 end
288 end 288 end
289 error("eof while reading string"); 289 error("eof while reading string");
290 end 290 end
291 local function readnumber() 291 local function readnumber()