- dev-luatex - NTG Mailing Lists

Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 05 Feb '09

05 Feb '09

------------------------------------------------------------------------ r1857 | taco | 2009-02-05 11:00:48 +0100 (Thu, 05 Feb 2009) | 2 lines Changed paths: M /trunk/manual/luatexref-t.pdf M /trunk/manual/luatexref-t.tex M /trunk/src/texk/web2c/luatexdir/luatex.defines M /trunk/src/texk/web2c/luatexdir/luatex.web M /trunk/src/texk/web2c/luatexdir/tex/math.c M /trunk/src/texk/web2c/luatexdir/texmath.h allow math_char and math_given in v and h modes ------------------------------------------------------------------------

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Floating point exception
by Javier Múgica 04 Feb '09

04 Feb '09

I don't know whether this is a problem of luatex or of my Linux, but with the latest version I get this message from the operating system (because it is in Spanish) javier@javier-laptop:~$ luatex Excepción de coma flotante javier@javier-laptop:~$ i.e., "floating point exception". I do not even see the "This is Luatex... " message. --Javier A.

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Strange behaviour
by Elie Roux 02 Feb '09

02 Feb '09

Hello, here is an example of some behaviours I find quite strange... It is a really short and simple example in plainTeX. It shows that if we have set \localleftbox or \localrightbox once, every line will have two more (empty) nodes. I think this behaviour is quite uncoherent, because packages (like GregorioTeX) set some \localleftbox and \localrightbox and then unsets them, so if someone wants to count the nodes of a line, this result will depend if he has a score in his document or not, even if he counts the nodes of a line that has nothing to do with a score... I think it would be better if these empty nodes were suppressed... The other behaviour I find strange is that an attribute on a node can be both 1 and -1... It's just a curiosity, as the good way to test if an attribute exists is (I think) to call node.has_attribute with only two arguments. Also, is there a way to get the value of an attribute on a node by doing something else than testing some? Thank you in advance, -- Elie

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Generating the sources
by Javier Múgica 02 Feb '09

02 Feb '09

Some time ago I had a problem with the fonts when generating the format, which I posted here. New versions didn't solve it, I always get the annoying Could not load ec-lmr12.tfm. Inexistent or bad font file, or something like that. I decided to compile and debug LuateX myself. Something worth indeed if I ever plan to become a developper. It was the first time I tangled something. I saw a luatangle.web (if my memory does not betray me), so I started tangling that, but I get pascal code, and I don't have a pascal compiler. I haven't had time ever since, so I simply stopped. Is there a way of generating c-source, or will I have to wait to September or so? If there is one, even though I am a programer a step-by-step explanation will be very wellcome. Tanks, --Javier A.

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Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 02 Feb '09

02 Feb '09

------------------------------------------------------------------------ r1856 | taco | 2009-02-02 18:29:11 +0100 (Mon, 02 Feb 2009) | 4 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/tex/mlist.c don't use the MathConstant AccentBaseHeight unless unavoidable (accent placement is a font-specific parameter, not a global math parameter) ------------------------------------------------------------------------

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Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 02 Feb '09

02 Feb '09

------------------------------------------------------------------------ r1855 | taco | 2009-02-02 12:37:48 +0100 (Mon, 02 Feb 2009) | 2 lines Changed paths: M /trunk/manual/luatexref-t.pdf M /trunk/manual/luatexref-t.tex add a paragraph about OFMFONTS vs TFMFONTS ------------------------------------------------------------------------

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Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 01 Feb '09

01 Feb '09

------------------------------------------------------------------------ r1853 | oneiros | 2009-02-01 18:01:45 +0100 (Sun, 01 Feb 2009) | 2 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/tex/mlist.c fix a warning: 'x' may be used uninitialized in this function ------------------------------------------------------------------------ r1854 | oneiros | 2009-02-01 18:07:39 +0100 (Sun, 01 Feb 2009) | 2 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/tex/math.c M /trunk/src/texk/web2c/luatexdir/tex/mlist.c M /trunk/src/texk/web2c/luatexdir/texmath.h indent ------------------------------------------------------------------------

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Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 01 Feb '09

01 Feb '09

------------------------------------------------------------------------ r1850 | taco | 2009-02-01 13:48:07 +0100 (Sun, 01 Feb 2009) | 3 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/luatex.defines M /trunk/src/texk/web2c/luatexdir/luatex.web M /trunk/src/texk/web2c/luatexdir/tex/math.c M /trunk/src/texk/web2c/luatexdir/tex/mlist.c M /trunk/src/texk/web2c/luatexdir/texmath.h Add eight times eight math parameters (in all styles) for the inter-element mu spacing values ------------------------------------------------------------------------ r1851 | taco | 2009-02-01 14:38:55 +0100 (Sun, 01 Feb 2009) | 3 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/luatex.web M /trunk/src/texk/web2c/luatexdir/tex/mlist.c fix handling of \the\Umath....spacing, and correct the behaviour for the impossible items ------------------------------------------------------------------------ r1852 | taco | 2009-02-01 15:36:13 +0100 (Sun, 01 Feb 2009) | 2 lines Changed paths: M /trunk/manual/luatexref-t.pdf M /trunk/manual/luatexref-t.tex Updated manual descriptions, and added the new 64 primitives ------------------------------------------------------------------------

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A few newbie questions
by Yue Wang 01 Feb '09

01 Feb '09

Hi, Taco: Last week I stayed in my grandma's home (located in a beautiful countryside) which has limited internet access. So I planned to study the luatex source code during the stay. I read a small subsect of the LuaTeX source and most parts of MetaPost source code and have a few newbie questions: I will refer to the mp.w as an example, since it is finished and I am more familiar with the C programming language. - wouldn't it be great if we remove the packed data dependency? Knuth used packed data since memory space was very valuable during the years when he wrote the TeX and MetaFont program. By doing so, he can split a memory word (the space needed for a 32bit integer) into two, three or four so that he can save more spaces. In pdfTeX and MetaPost, almost all the important data structures (like all kinds of nodes, boxes, lists) are build on top of the packed data structure. For example, In TeX's char_node presentation, instead of using one word for font and one word for character, he can use one word to do so by defining two web macros font==type and character==subtype. However, Memory consumption is not that important these years and in LuaTeX other representations uses much more memory (like parsing a complicated opentype font and dumping it into a lua table using the fontforge library). So wouldn't it be bettter if we remove the packed data? It will make the code more readable at the cost of consuming a few more memory (the TeX web side is very memory efficient, so there won't be big memory footprint even if we double the memory consumption) since we can get rid of the messy web or C macros. For example, in Part 21, mp.w, we define more than a dozen macros to get all the variables of a edge which A points to its start. Such code may confuse modern programmers who learn to program in C after the mid-1990s. They prefer to do something like this: typedef fill_node struct { path *path_p; pen *pen_p; ..... int miterlim_var; }; if we want to create a new fill node, instead of creating its node, and setting its path_p to a given pointer p using mp_path_p(t)=p; it will be more understandable if we can do this: node * mp_new_fill_node (pointer, p){ fill_node *fn = malloc (sizeof (fill_node)); /* a fill_node*/ fn->path_p = p; fn->pen_p=NULL; fn->red_val=0 .... return fn } -Why can't we use IEEE floating number specification? TeX/MetaPost have it's own number presentation builtin. But this is a very complicated and strange floating number system which represent each number as a integer. I think IEEE floating number specification is good enough for implementing TeX? Today almost every operating system support float/double, and the precision is great. If we can do this, Part 7 of the mp.w and luatex.web can be totally removed, and we can also clean the conversion macros in the rest of the macros. If we remove the dependency of part 7 and part 9, maybe we can also make our code more portable on different machines. - Why should we do memory management ourselves? I can see that in mp.w, we maintain a node pool (a fixed continuous space in physical memory). When we want to allocate a node, we should call mp_get_node, which does several things like finding available place for memory allocation, reporting error if the memory is exceed then it tries to put everything with different structures into the pool. Wouldn't it be great if we just ask the operating system's C library to handle these tasks (like using malloc and free as the example code of mp_new_fill_node shows). Modern operating system's library is more efficient, and it will also make the luatex code looks better. - From the part of the code I read, if I understand correctly, the only reason of incorporating fontforge is to get the font Metrics data? If so, I think FreeType2 is sufficient to accomplish the task? [I think freetype2 is much smaller and efficient, and fontforge use freetype2] Yue Wang

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Cron <luatex@vz3> /var/www/luatex.org/www/bin/luatex-svn
by root＠www.metatex.org 31 Jan '09

31 Jan '09

------------------------------------------------------------------------ r1848 | oneiros | 2009-01-31 01:02:09 +0100 (Sat, 31 Jan 2009) | 2 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/ptexlib.h add missing declaration ------------------------------------------------------------------------ r1849 | oneiros | 2009-01-31 01:05:23 +0100 (Sat, 31 Jan 2009) | 2 lines Changed paths: M /trunk/src/texk/web2c/luatexdir/ptexlib.h M /trunk/src/texk/web2c/luatexdir/tex/math.c M /trunk/src/texk/web2c/luatexdir/tex/mlist.c M /trunk/src/texk/web2c/luatexdir/tex/texnodes.c indent ------------------------------------------------------------------------

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