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LuaSrcDiet工具介绍（lua源码处理软件）

2024-08-30 07:57:43   250人阅读

Diet

Food

  • Diet (nutrition), the sum of the food consumed by an organism or group
  • Dieting, the deliberate selection of food to control body weight or nutrient intake
    • Diet food, foods that aid in creating a diet for weight loss

https://en.wikipedia.org/wiki/Diet

 

  • 节食；进行规定饮食
  • n.日常饮食；日常食物；规定饮食（为健康或减肥等目的）；规定饮食的时期
  • Web食性；食谱；膳食

https://www.bing.com/dict/search?q=diet&FORM=BDVSP2&qpvt=diet

 

Diet 结合工具的使用， 应该是节食的含义， 即使用规定的饮食，达到减肥的目的。

luaSrcDiet

知道了英文的意思， 这里luasrcdiet == lua source code diet， 即 对lua源代码进行瘦身。

 

http://luasrcdiet.luaforge.net/

LuaSrcDiet reduces the size of Lua 5.1.x source files by aggressively removing all unnecessary whitespace and comments, optimizing constant tokens, and renaming local variables to shorter names.

 

LuaSrcDiet squeezes its own (heavily commented) sources from 121KB down to 28KB. Further compression (bzip2 or lzma) brings the size down to under 10KB, representing a 12X reduction in size.

 

Sample Output

The following is the result of processing llex.lua from LuaSrcDiet 0.11.0using various optimization options:

 

LuaSrcDietOption
Size (bytes)
Link toSample File
Original
12,421
llex.lua.txt
Empty lines only
12,395
llex_emptylines.lua.txt
Whitespace only
9,372
llex_whitespace.lua.txt
Local rename only
11,794
llex_locals.lua.txt
--basic(token optimizations only)
3,835
llex_basic.lua.txt
Program default
3,208
llex_default.lua.txt
--maximum
3,130
llex_maximum.lua.txt

 

 

功能

LuaSrcDiet features include the following:

  • Predefined default, --basic(token-only) and --maximumsettings.
  • Avoid deleting a block comment with a certain message with --keep; this is for copyright orlicense texts.
  • Special handling for #! (shbang) lines and in functions, "self"implicit parameters.
  • Dumping of raw information: lexertokens and local variable nametracking information
  • Plugin interface (experimental!) with HTML and SLOC plugins.
  • HTML plugin: outputs files that highlights globals and locals(useful for eliminating globals), sample: html_sample.html.
    -----
    这个挺好@！！！！！
  • SLOC plugin: countssignificant lines of Lua code, like SLOCCount.

List of optimizations:

    • Line endings are always normalized to LF, except those embeddedin comments or strings.
    • --opt-comments: Removalof comments and comment blocks.
    • --opt-whitespace:Removal of whitespace, excluding end-of-line characters.
    • --opt-emptylines:Removal of empty lines.
    • --opt-eols: Removal ofunnecessary end-of-line characters.
    • --opt-strings: Rewritestrings and long strings. Sample: Before and After
    • --opt-numbers: Rewritenumbers. Sample: Before and After
    • --opt-locals: Renamelocal variable names. Does not rename field or method names.
    • --opt-entropy: Tries toimprove symbol entropy when renaming locals by calculating actualletter frequencies.

 

与其他工具对比

File sizes of LuaSrcDiet 0.11.0 main files in various forms:

 

Source File
Original Size
(bytes)
luac normal
(bytes)
luac stripped
(bytes)
LuaSrcDiet
--basic (bytes)
LuaSrcDiet
--maximum (bytes)
LuaSrcDiet.lua
21,961
20,952
11,000
11,005
8,159
llex.lua
12,421
8,613
4,247
3,835
3,130
lparser.lua
41,757
27,215
12,506
11,755
7,666
optlex.lua
31,009
16,992
8,021
9,129
6,858
optparser.lua
16,511
9,021
3,520
5,087
2,999
Total
123,659
82,793
39,294
40,811
28,812

 

 

 

 
Null
loop
Stripped
binary chunk
Original
Sources
Squeezed
Sources
Total Size
(bytes)
0
39,294
123,640
28,793
Iterations

312,155
9,680
1306
1,592
Duration
(sec)
10
10
10
10
Time/iteration
(msec)
0.032
1.033
7.657
6.281
Time/iteration,adjusted for null
(msec)
-
1.001
7.625
6.249
Load rate
(MB/sec)
-
37.44
15.46
4.39
Load time per byte
(ns)
-
25.5
61.7
217.0
Load time per token(ns)
-
-
682
559
Source time vs binary chunk timeratio

-
1.00
7.62
6.24
Binary chunk rate vs. sourcerate ratio
-
1.00
2.42
8.53

 

The LuaSrcDiet 0.11.0 files (original, squeezed with --maximum and stripped binary chunks versions) are loaded into memory first before a loop runs to repeatedly load the script files for 10 seconds. A null loop is also performed (processing empty strings) and the time taken per null iteration is subtracted as a form of null adjustment. Then, various performance parameters are calculated. Note that LuaSrcDiet.lua was slightly modified (#! line removed) to let the loadstring function run. The results below were obtained with a Lua 5.1.3 executable compiled using "make generic" on Cygwin/Windows XP SP2 on a Sempron 3000+ (1.8GHz). The LuaSrcDiet 0.11.0 source files have 11,180 ‘real‘ tokens in total.



Null
loop
Stripped
binary chunk
Original
Sources
Squeezed
Sources
Total Size
(bytes)
0
39,294
123,640
28,793
Iterations

312,155
9,680
1306
1,592
Duration
(sec)
10
10
10
10
Time/iteration
(msec)
0.032
1.033
7.657
6.281
Time/iteration,adjusted for null
(msec)
-
1.001
7.625
6.249
Load rate
(MB/sec)
-
37.44
15.46
4.39
Load time per byte
(ns)
-
25.5
61.7
217.0
Load time per token(ns)
-
-
682
559
Source time vs binary chunk timeratio

-
1.00
7.62
6.24
Binary chunk rate vs. sourcerate ratio
-
1.00
2.42
8.53

The above shows that stripped binary chunks is still, in many ways,the highest-performance form of fixed Lua scripts. On a very averagemachine, scripts load at over 37MB/sec (in memory). This is verycomparable to the burst speeds of common desktop hard disks of 2008. Ifinstant response is paramount, stripped binary chunks has littlecompetition.

 

LuaSrcDiet工具介绍（lua源码处理软件）


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