Re: [Bug-apl] Gnu APL Quad-Quote read coming from souce file and not the terminal

[Juergen Sauermann]

Hi Fred, I had a look at the old code and saw that for ⍞ and ⎕ testcase files are handled differently than script files. I have recreated the old behavior in SVN 475. I noticed that echo of the ⍞ input is off when GNU APL is run from a script. I have not yet considered the combination of scripting with interactive input, so I am not sure if this is OK. Or maybe such scripts should not run with --script (which implies --noCIN). /// Jürgen On 09/15/2014 06:02 PM, Frederick H. Pitts wrote: Hello Juergen, 1) Up until at svn 443, ⍞ references were from the terminal for shell scripts and files processed with 'apl -f'. Sure of that because I just checked out that and earlier svn versions and tested. ⍞ references being coupled to script APL source files and not the terminal is a relatively recent change in how Gnu APL works. 2) The "APL2 Programming: Language Reference" and "ISO/IEC 13751:2000(E)" give no indication that ⍞ is ever connected to anything other than a terminal. 3) If ⍞ references in shell script and apl -f processed files have to be satisfied by reading from the apl source file, what is the point of directing assignments to ⍞ to the terminal? The user is not going to be able to respond to the prompts, at least, not from the terminal. Regards, Fred On Mon, 2014-09-15 at 14:28 +0200, Juergen Sauermann wrote: Hi Fred, first of all, please note that CORE_COUNT_WANTED= has currently no effect since I am working on that. I fixed Parallel.cc so that it compiles, SVN 473. Regarding ⍞ your expectation seems to be that ⍞ always reads from the terminal even if the input comes from a file? This is not so in GNU APL; ⍞ reads from stdin of the process and if that is a file then the input is read from the file. Your example below gives (anfd should give): eedjsa@server65:~/apl/apl-1.4/src$ ./hello.apl What is your name? Hello This is easier to undestand if we change the line before )OFF to something non-empty: #!./apl --script -- ⍝ ------------------------------ ∇hello; X ⍞ ← 'What is your name? ' X ← ⍞ ⎕ ← 'Hello ', ( X ≠ ' ' ) / X ∇ hello !!! this line is read by ⍞ in function hello !!! )OFF ⍝ ------------------------------ This gives: eedjsa@server65:~/apl/apl-1.4/src$ ./hello.apl What is your name? Hello !!!thislineisreadby⍞infunctionhello!!! So far everything looks OK, at least on my machine. Of cause you could argue if reading from stdin was a good choice in the first place. I believe it was because: - you cannot assume to always have a usable terminal - testcase files (for testing ⍞ in particular) - CGI scripts written in APL (which communicates with APL via stdin and stdout) /// Jürgen On 09/15/2014 12:17 AM, Frederick H. Pitts wrote: Hello Juergen, I cloned svn 472, configured and tried to build. I find that if I configure with CORE_COUNT_WANTED=argv, the following compiler error results: Parallel.cc: In static member function 'static void Parallel::init_CPUs(bool)': Parallel.cc:333:7: 'uprefs' was not declared in this scope uprefs.requested_cc; // parallel, as per --cc option A similar but differ error occurs if I use CORE_COUNT_WANTED=syl. If I configure without specifying CORE_COUNT_WANTED, the build completes OK. However I'm still having the problem of the ⍞ reference not reading from the terminal. Something as simple as: #!/usr/local/bin/apl --script -- ⍝ ------------------------------ ∇hello; X ⍞ ← 'What is your name? ' X ← ⍞ ⎕ ← 'Hello ', ( X ≠ ' ' ) / X ∇ hello )OFF ⍝ ------------------------------ demonstrates the issue. If the above is executed as a shell script with ./hello.apl or the apl invocation apl -f hello.apl the ⍞ reference input is not coming from the terminal. Regards, Fred On Sun, 2014-09-14 at 16:27 +0200, Juergen Sauermann wrote: Hi Fred, Thanks. I see some debug outout at the end of your file: hello What is your name? )SI not cleared at the end of ./hello.apl: hello[2] X ← ⍞ ^ ⋆ hello ^ That debug output should only occur if a testcase file is executed and not for normal script file like your hello.apl. This should be fixed in SVN 472. ------ Apart from that I can't really see what is wrong. The intended behavior (and the actual behavior on my box) is that GNU APL reads from input files as long as there are unprocessed files and switch to stdin after the last input file was processed. In your case, hello.apl defines function hello and calls it on the last line of hello.apl. After having read the last line of hello.apl, the next input is read from stdin: hello ← from script What is your name? Jürgen ← from stdin Hello Jürgen If your box behaves differently then I need more details. /// Jürgen On 09/13/2014 03:31 AM, Frederick H. Pitts wrote: Gentle people, As of SVN 470, ⍞ references are taking their input from the APL source file instead of the terminal if there is any source file left to be read. It appears that the interpreter is starting to execute code before the interpreter has completely consumed the source file and is confusing the file input stream with the terminal stream. A file that demonstrates the error is attached. Regards, Fred