2005/2/18-20 [Computer/SW/Compilers] UID:36229 Activity:nil | 2/18 When you need to parse something simple do you usually use (f)lex/yacc
or just write a recursive-descent parser? I've done both in the past,
but I can't seem to justify using one approach over the other.
\_ the point of yacc is so that you can write a grammar for it so that
when things change you don't have to spend a lot of time
rewriting your hand-written C/Java recursive-descent parser. For
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2004/5/21-22 [Computer/SW/Compilers] UID:30345 Activity:very high | 5/21 I was not a CS major and never took the compiler class. What is
a good book to help me write a compiler? And what about interpreter?
Do they basically involve the same issues except code generation and
optimization?
\_ Use the book by Robert Mak, called "Writing Interpreters and
Compilers in C++." It's a practical, hands-on "lab" type book which
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2004/5/6 [Computer/SW/Compilers] UID:30060 Activity:high | 5/6 I've been out of school for too long. If I want to write a simple
compiler, what tools do I need besides yacc and what do they do?
Thanks a bunch!
\_ well there's also lex (flex) for the lexical analyzer (tokenizing).
\_ java or c? if c, lex/flex=good tokenizer. yacc/bison are great
for grammar. both are LALR so they're pretty powerful.
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2003/6/25-26 [Computer/SW/Compilers] UID:28839 Activity:high | 6/25 When yacc man page refers to "LR(1) parser", is LR(1) a reference to
some other man page or does LR(1) have some other special meaning?
-clueless
\_ some other special meaning, LR(1) is a style of parse tree
generation that has certain limitatations. Sort of like how
reg exps can't search for all the things you want to search for
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2001/7/16-17 [Computer/SW/Languages/C_Cplusplus] UID:21812 Activity:moderate | 7/16 Dear motd, is it true that the gnu implementation of C++ lacks
<sstream>? What gives?
\_ see below on the bit on ali. C++? who cares.
\_ what should we care about, java? eiffel? mh?
\_ what should we care about, java? eiffel? ml?
\_ Ocaml.
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2000/12/17 [Computer/SW/Compilers, Computer/Theory] UID:20114 Activity:high | 12/14 I totally don't see any relevance in teaching Lambda calculus in an
undergrad course to describe stupid semantic rules. Fuck Aiken and
his stupid ambiguous exams!!!
researcher)
\_ usually to emphasize its distinction from an algebra. keep
in mind that "the calculus" taught in high school is
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2000/8/14-15 [Computer/Theory] UID:18977 Activity:high | 8/13 Is there such a thing as an algorithm that can output another
algorithm? Kind of like self tuning, self evolving algorithm?
\_ Yes. Not as glamorous as it sounds; see also: genetic algorithms,
Remez algorithms, data-directed programming
\_ bison, yacc, (f)lex, and many many more. not self tuning though.
\_ There are algorithmns that can learn from data. It's really not
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2000/5/20-22 [Computer/SW/Languages/Misc] UID:18307 Activity:kinda low | 5/20 When I need an spec/interface/extension language, I use
0 my own language and lex+yacc
1 my own language and my own lexer/parser
<number value="0"/> XML
2 scheme
1 PROLOG!!!
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2000/1/19-20 [Computer/SW/Database] UID:17267 Activity:kinda low | 1/18 Wanted 2 programmers to help develop web based apps: Between the
two, will need PERL, CGI, SQL, Yacc(or Bison), Javascript, HTML.
Full time or Part time (20 hours minimum). At least two weeks(tm)
with possibilities of more if appropriate. Work on-site (downTown
Oakland) or off-site. (510) 271-4142 ask for Garo, Alan or Ephram.
-gargamel
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1999/7/11-14 [Computer/SW/Compilers] UID:16105 Activity:high | 7/11 Since bison/yacc/(f)lex all act like state machines is there any way
to implement a program with multiple context parsers (eg. a
multithreaded network deamon that needs to parse an input)?
\_ This problem is even worse in OpenGL that employ specialized
rendering hardware since the GL libraries act on the state of
the video card. In other words, there's only one rendering
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2009/8/19-9/1 [Computer/SW/Unix] UID:53285 Activity:nil | 8/18 Hi again, new freebsd guy here again, in bash I was able to go
LD_LIBRARY_PATH=/opt/foo/lib ./runmyapp
I managed to do this in tcsh by using setenv in a shell script
that setenv's the lib path and then executes $1, just wondering
if there was a way to do it in 1 line from the cmd line as in bash?
Thanks, btw %2c or %3c worked. Freebsd, tcsh and vi forever!
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2009/7/24-29 [Computer/SW/Editors/Vi] UID:53195 Activity:low | 7/24 Is dos2unix available somewhere? Someone added all those Ctrl-M's to
motd.public.
\_ %s/^V^M//g in vim. What has your editor done for you today?
\_ that works great in vi actually... in vim :set filetype=unix
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2008/12/2-7 [Computer/SW/Editors/Vi] UID:52143 Activity:nil | 12/2 Article 1, Section 6
No Senator or Representative shall, during the Time for which he was
elected, be appointed to any civil Office under the Authority of the
United States, which shall have been created, or the Emoluments whereof
shall have been encreased during such time
\_ Stop stomping my changes.
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2008/9/22-24 [Science/Electric, Computer/Companies/Google, Computer/SW/Editors/Vi] UID:51263 Activity:kinda low | 9/22 Gmail's "conversation feature" drives me nuts! Is there a way to
disable that and make Gmail act like every other e-mail client on the
planet? WTF thought this was a nice thing to have on by default?
\_ Umm, why don't you just use another email service then...
\_ Umm, I do, which is how I have something to compare to. I get
mail in at least 4 places only one of which is Gmail. I
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2008/6/12-13 [Computer/SW/Editors/Emacs, Computer/SW/Editors/Vi, Computer/SW/Unix] UID:50233 Activity:nil | 6/12 Does emacs or vi include a column paste? I sometimes have a block
text I want to insert horizntally next to another block/column. This
is common for data plotting etc. In Microsoft Word has this, I need
it in a Unix text editor.
\_ Does M-x picture-mode in emacs work for you?
\_ Yes, with the commands below, thanks.
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2008/2/21-25 [Academia/Berkeley/CSUA/Motd, Computer/SW/Editors/Vi] UID:49207 Activity:nil | 2/21 Why don't people respect the lock on the motd put on by vi or
emacs? Are they that paranoid about kchang's motd watching program?
Is anyone still using motdedit?
\_ hey I still use it. Some people don't though. some sneaky folks
edit a copy of the motd offline and put it in place, not caring how
much they stomp on others' changes that might have happened in the
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2007/11/13-21 [Computer/Networking] UID:48628 Activity:low | 11/13 If I have a application on machine foo sending data really fast to
an application on machine bar via TCP, and the bar applications job
is write that to disk as fast as possible, what happens if the
network stream is faster than the disk writes?
\_ Look up the differences between TCP/IP flow control and
congestion control. The answer is in front of you.
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