288 lines
5.6 KiB
Forth
288 lines
5.6 KiB
Forth
# RETRO
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This is a set of extensions for RRE.
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# Console Input
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~~~
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:getc (-c) `1001 ;
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~~~
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---------------------------------------------------------------
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# Floating Point
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~~~
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:n:to-float (n-_f:-n) #0 `-6000 ;
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:s:to-float (s-_f:-n) #1 `-6000 ;
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:f:to-string (f:n-__-s) s:empty dup #2 `-6000 ;
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:f:+ (f:ab-c) #3 `-6000 ;
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:f:- (f:ab-c) #4 `-6000 ;
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:f:* (f:ab-c) #5 `-6000 ;
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:f:/ (f:ab-c) #6 `-6000 ;
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:f:floor (f:ab-c) #7 `-6000 ;
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:f:eq? (f:ab-c) #8 `-6000 ;
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:f:-eq? (f:ab-c) #9 `-6000 ;
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:f:lt? (f:ab-c) #10 `-6000 ;
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:f:gt? (f:ab-c) #11 `-6000 ;
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:f:depth (-n) #12 `-6000 ;
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:f:dup (f:a-aa) #13 `-6000 ;
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:f:drop (f:a-) #14 `-6000 ;
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:f:swap (f:ab-ba) #15 `-6000 ;
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:f:over (f:ab-aba) f:to-string f:dup s:to-float f:swap ;
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:f:tuck (f:ab-bab) f:swap f:over ;
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:f:positive? #0 n:to-float f:gt? ;
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:f:negative? #0 n:to-float f:lt? ;
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:f:negate #-1 n:to-float f:* ;
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:f:abs f:dup f:negative? [ f:negate ] if ;
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:f:log (f:ab-c) #16 `-6000 ;
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:f:power (f:ab-c) #17 `-6000 ;
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:f:to-number (f:a-__-n) #18 `-6000 ;
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:prefix:. (s-__f:-f)
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compiling? [ s:keep ] [ s:temp ] choose &s:to-float class:word ; immediate
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:putf (f:-) f:to-string puts ;
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~~~
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---------------------------------------------------------------
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# Gopher
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RETRO has Gopher support via `gopher:get`.
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Takes:
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destination
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server name
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port
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selector
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Returns:
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number of characters read
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~~~
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:gopher:get `-6200 ;
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~~~
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---------------------------------------------------------------
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# Scripting: Command Line Arguments
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~~~
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:sys:argc (-n) `-6100 ;
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:sys:argv (n-s) s:empty swap `-6101 ;
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~~~
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# System Interaction
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The `unix:` namespace contains words for interacting with the
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host operating system.
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`unix:system` runs another application using the system shell
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and returns after execution is completed.
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~~~
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:unix:system (s-) `-8000 ;
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~~~
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`unix:fork` forks the current process and returns a process
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identifier.
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~~~
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:unix:fork (-n) `-8001 ;
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~~~
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`unix:exit` takes a return code and exits RRE, returning the
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specified code.
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~~~
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:unix:exit (n-) `-8002 ;
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~~~
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`unix:getpid` returns the current process identifier.
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~~~
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:unix:getpid (-n) `-8003 ;
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~~~
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This group is used to execute a new process in place of the
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current one. These take a program and optionally 1-3 arguments.
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They map to the execl() system call.
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Example:
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'/usr/bin/cal '2 '2019 unix:exec2
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~~~
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:unix:exec0 (s-) `-8004 ;
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:unix:exec1 (ss-) `-8005 ;
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:unix:exec2 (sss-) `-8006 ;
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:unix:exec3 (ssss-) `-8007 ;
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~~~
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`unix:wait` waits for a child process to complete. This maps to
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the wait() system call.
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~~~
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:unix:wait (-n) `-8008 ;
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~~~
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`unix:kill` terminates a process. Takes a process and a signal
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to send.
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~~~
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:unix:kill (nn-) `-8009 ;
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~~~
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~~~
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:unix:popen (sn-n) `-8010 ;
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:unix:pclose (n-) `-8011 ;
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~~~
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~~~
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:unix:write (sh-) [ dup s:length ] dip `-8012 ;
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~~~
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---------------------------------------------------------------
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# File I/O
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This implements words for interfacing with the POSIX file I/O words if
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you are using an interface supporting them. All of these are in the
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`file:` namespace.
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These are pretty much direct wrappers for fopen(), fclose(), etc.
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First up, constants for the file modes.
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| # | Used For |
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| - | ------------------ |
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| R | Mode for READING |
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| W | Mode for WRITING |
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| A | Mode for APPENDING |
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~~~
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#0 'file:R const
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#1 'file:W const
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#2 'file:A const
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#3 'file:R+ const
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~~~
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For opening a file, provide the file name and mode. This will return a
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number identifying the file handle.
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~~~
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:file:open (sm-h) `118 ;
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~~~
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Given a file handle, close the file.
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~~~
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:file:close (h-) `119 ;
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~~~
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Given a file handle, read a character.
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~~~
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:file:read (h-c) `120 ;
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~~~
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Write a character to an open file.
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~~~
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:file:write (ch-) `121 ;
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~~~
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Return the current pointer within a file.
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~~~
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:file:tell (h-n) `122 ;
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~~~
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Move the file pointer to the specified location.
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~~~
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:file:seek (nh-) `123 ;
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~~~
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Return the size of the opened file.
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~~~
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:file:size (h-n) `124 ;
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~~~
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Given a file name, delete the file.
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~~~
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:file:delete (s-) `125 ;
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~~~
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Flush pending writes to disk.
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~~~
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:file:flush (f-) `126 ;
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~~~
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Given a file name, return `TRUE` if it exists or `FALSE` otherwise.
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~~~
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:file:exists? (s-f)
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file:R file:open dup n:-zero?
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[ file:close TRUE ]
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[ drop FALSE ] choose ;
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~~~
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With that out of the way, we can begin building higher level functionality.
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The first of these reads a line from the file. This is read to `here`; move
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it somewhere safe if you need to keep it around.
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The second goes with it. The `for-each-line` word will invoke a combinator
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once for each line in a file. This makes some things trivial. E.g., a simple
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'cat' implementation could be as simple as:
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'filename [ puts nl ] file:for-each-line
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~~~
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{{
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'FID var
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'FSize var
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'Action var
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'Buffer var
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:-eof? (-f) @FID file:tell @FSize lt? ;
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:preserve (q-) &FID [ &FSize [ call ] v:preserve ] v:preserve ;
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---reveal---
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:file:read-line (f-s)
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!FID
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[ here dup !Buffer buffer:set
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[ @FID file:read dup buffer:add
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[ ASCII:CR eq? ] [ ASCII:LF eq? ] [ ASCII:NUL eq? ] tri or or ] until
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buffer:get drop ] buffer:preserve
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@Buffer ;
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:file:for-each-line (sq-)
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[ !Action
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file:R file:open !FID
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@FID file:size !FSize
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[ @FID file:read-line @Action call -eof? ] while
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@FID file:close
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] preserve ;
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}}
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~~~
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`file:slurp` reads a file into a buffer.
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~~~
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{{
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'FID var
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'Size var
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---reveal---
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:file:slurp (as-)
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[ file:R file:open !FID
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buffer:set
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@FID file:size !Size
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@Size [ @FID file:read buffer:add ] times
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@FID file:close
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] buffer:preserve ;
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}}
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~~~
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