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-nat-5.0.3
-
-This directory contains versions of front end files that are rewritten
-to be more "native" to Lua. These files should be considered as
-exercises in exploring ways to write the front end, for example, to
-write a front end that is optimized for size, etc. See also file size
-data further below.
-
-The following are the different versions available (mk2 == "mark 2",
-this is commonly used in the UK, e.g. for aeroplanes during WWII):
-
-Lexers
-------
-
-WARNING: Theses lexer may or may not exhibit exact behaviour when lexing
-strings or long strings with embedded CRLF newlines. The CRLF sequence
-may be translated into LF (the reference manual is unclear on this.) The
-user is advised to stick to LF line endings exclusively.
-
-llex_mk2        Rewritten from original ported code to become more
-                Lua-like. Still uses a stream-based input interface.
-                MK2 still scans using a per-character function that
-                is pretty inefficient.
-
-                Status: TESTED
-
-llex_mk3        A rewritten version of MK2 that needs input to be
-                entered as a single string. Unless an application's
-                need is very unusual, this should not be a problem.
-                It will not work for per-line interaction, though.
-                MK3 no longer needs stream input functions. This
-                version is also heavily optimized for size. MK3 scans
-                using find functions and doesn't create many strings.
-
-                Status: TESTED
-
-llex_mk4        A rewritten version of MK3 that is line-oriented.
-                This allows a command-line version that works in the
-                usual way to be written.
-
-                Status: TESTED
-
-The following is a comparison of file sizes (as of 20061111):
-
-                 lzio    llex    TOTAL  Speed (2)
-                (bytes) (bytes) (bytes) (KB/s)
-----------------------------------------------
-Binary (Mingw)    416    5312    5728     N/A
-----------------------------------------------
-(in orig-5.0.3:)
-----------------------------------------------
-normal           2219   12639   14585    404.9
-stripped         1292    7618    8910
-----------------------------------------------
-(in nat-5.0.3:)
-----------------------------------------------
-mk2              1995    7628    9623    469.5
-mk2-stripped     1195    4003    5298
-----------------------------------------------
-mk3 (1)             -    6552    6552   1870.8
-mk3-stripped        -    3286    3286
-----------------------------------------------
-mk4              1337    6956    8293    802.9
-mk4-stripped      798    3457    4225
-----------------------------------------------
-
-(1) mk3 does not have a file input streaming function
-
-(2) Speed was benchmarked using a Sempron 3000+. Benchmark scripts are
-in the test directories. Best of first three figures quoted. This is a
-measurement of raw lexer speed, i.e. tokens are read but no processing
-is done. All files are read in entirely before running the lexer.
-
-The performance of the orig-5.0.3 parser is probably a whole magnitude
-less than the orig-5.0.3 lexer performance.
-
-Parsers
--------
-
-lparser_mk3     Written for the simplified lexer interface of llex_mk3+.
-                (Should be compatible with llex_mk4 too, but untested.)
-                This is a lexer skeleton, stripped of codegen code. See
-                the comments in the source code for more information.
-                Without logging messages and comments, it's under 600 LOC.
-
-                Sample output of the parser message logger can be found
-                in the test/parser_log subdirectory.
-
-                Tested with test_parser-5.0.lua, the Lua 5.0.x parser test
-                cases in the test_lua/ directory, appears to be fine.
-
-                Status: SNIPPETS APPEAR TO WORK
-
-lparser_mk3b    As above, with variable management code added. In order
-                to use the parser usefully, variable management code is
-                a big step forward, allowing the parser to differentiate
-                locals, upvalues and globals. The number of added lines
-                is around 100 LOC. A binary chunk of lparser_mk3b
-                (stripped) is 18076 bytes.
-
-                Sample output of the parser message logger can be found
-                in the test/parser_log subdirectory.
-
-                Tested with test_parser-5.0.lua, the Lua 5.0.x parser test
-                cases in the test_lua/ directory, appears to be fine.
-
-                Status: SNIPPETS APPEAR TO WORK
-
-There will be no further development beyond lparser_mk3b. Further work
-will focus on a 5.1.x equivalent, for which both a parser skeleton and a
-parser with full code generation using nicely commented code is planned.
-
-Other notes:
-------------
-
-For Lua 5.0.2, see Yueliang 0.1.3, which was the last release of Lua
-5.0.2 material.
-
-Test scripts for the lexer should probably be consolidated, but it's a
-little difficult because not all lexers give the same error messages or
-use the same token names or format.
-