File:  [gforth] / gforth / stuff.fs
Revision 1.62: download - view: text, annotated - select for diffs
Mon Oct 5 15:54:28 2009 UTC (12 years, 1 month ago) by pazsan
Branches: MAIN
CVS tags: HEAD
added triple-backslash to end of file

    1: \ miscelleneous words
    2: 
    3: \ Copyright (C) 1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation, either version 3
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program. If not, see http://www.gnu.org/licenses/.
   19: 
   20: require glocals.fs
   21: 
   22: ' require alias needs ( ... "name" -- ... ) \ gforth
   23: \G An alias for @code{require}; exists on other systems (e.g., Win32Forth).
   24: \ needs is an F-PC name. we will probably switch to 'needs' in the future
   25: 
   26: \ a little more compiler security
   27: 
   28: \ currently not used by Gforth, but maybe by add-ons e.g., the 486asm
   29: AUser CSP
   30: 
   31: : !CSP ( -- )
   32:     sp@ csp ! ;
   33: 
   34: : ?CSP ( -- )
   35:     sp@ csp @ <> -22 and throw ;
   36: 
   37: \ DMIN and DMAX
   38: 
   39: : dmin ( d1 d2 -- d ) \ double d-min
   40:     2over 2over d> IF  2swap  THEN 2drop ;
   41: 
   42: 
   43: : dmax ( d1 d2 -- d ) \ double d-max
   44:     2over 2over d< IF  2swap  THEN 2drop ;
   45: 
   46: \ shell commands
   47: 
   48: 0 Value $? ( -- n ) \ gforth dollar-question
   49: \G @code{Value} -- the exit status returned by the most recently executed
   50: \G @code{system} command.
   51: 
   52: : system ( c-addr u -- ) \ gforth
   53: \G Pass the string specified by @var{c-addr u} to the host operating
   54: \G system for execution in a sub-shell.  The value of the environment
   55: \G variable @code{GFORTHSYSTEMPREFIX} (or its default value) is
   56: \G prepended to the string (mainly to support using @code{command.com}
   57: \G as shell in Windows instead of whatever shell Cygwin uses by
   58: \G default; @pxref{Environment variables}).
   59:     (system) throw TO $? ;
   60: 
   61: : sh ( "..." -- ) \ gforth
   62: \G Parse a string and use @code{system} to pass it to the host
   63: \G operating system for execution in a sub-shell.
   64:     '# parse cr system ;
   65: 
   66: \ stuff
   67: 
   68: : ]L ( compilation: n -- ; run-time: -- n ) \ gforth
   69:     \G equivalent to @code{] literal}
   70:     ] postpone literal ;
   71: 
   72: [ifundef] in-dictionary?
   73: : in-dictionary? ( x -- f )
   74:     forthstart dictionary-end within ;
   75: [endif]
   76: 
   77: : in-return-stack? ( addr -- f )
   78:     rp0 @ swap - [ forthstart 6 cells + ]L @ u< ;
   79: 
   80: \ const-does>
   81: 
   82: : compile-literals ( w*u u -- ; run-time: -- w*u ) recursive
   83:     \ compile u literals, starting with the bottommost one
   84:     ?dup-if
   85: 	swap >r 1- compile-literals
   86: 	r> POSTPONE literal
   87:     endif ;
   88: 
   89: : compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive
   90:     \ compile u fliterals, starting with the bottommost one
   91:     ?dup-if
   92: 	{ F: r } 1- compile-fliterals
   93: 	r POSTPONE fliteral
   94:     endif ;
   95: 
   96: : (const-does>) ( w*uw r*ur uw ur target "name" -- )
   97:     \ define a colon definition "name" containing w*uw r*ur as
   98:     \ literals and a call to target.
   99:     { uw ur target }
  100:     header docol: cfa, \ start colon def without stack junk
  101:     ur compile-fliterals uw compile-literals
  102:     target compile, POSTPONE exit reveal ;
  103: 
  104: : const-does> ( run-time: w*uw r*ur uw ur "name" -- ) \ gforth
  105:     \G Defines @var{name} and returns.
  106:     \G  
  107:     \G @var{name} execution: pushes @var{w*uw r*ur}, then performs the
  108:     \G code following the @code{const-does>}.
  109:     here >r 0 POSTPONE literal
  110:     POSTPONE (const-does>)
  111:     POSTPONE ;
  112:     noname : POSTPONE rdrop
  113:     latestxt r> cell+ ! \ patch the literal
  114: ; immediate
  115: 
  116: \ !! rewrite slurp-file using slurp-fid
  117: : slurp-file ( c-addr1 u1 -- c-addr2 u2 ) \ gforth
  118:     \G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents
  119:     r/o bin open-file throw >r
  120:     r@ file-size throw abort" file too large"
  121:     dup allocate throw swap
  122:     2dup r@ read-file throw over <> abort" could not read whole file"
  123:     r> close-file throw ;
  124: 
  125: : slurp-fid ( fid -- addr u ) \ gforth
  126: \G @var{addr u} is the content of the file @var{fid}
  127:     { fid }
  128:     0 0 begin ( awhole uwhole )
  129: 	dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew )
  130: 	rot r@ fid read-file throw ( awhole uwhole uread R: unew )
  131: 	r> 2dup =
  132:     while ( awhole uwhole uread unew )
  133: 	2drop
  134:     repeat
  135:     - + dup >r resize throw r> ;
  136: 
  137: \ ]] ... [[
  138: 
  139: : compile-literal ( n -- )
  140:     postpone literal ;
  141: 
  142: : compile-compile-literal ( n -- )
  143:     compile-literal postpone compile-literal ;
  144: 
  145: : compile-2literal ( n1 n2 -- )
  146:     postpone 2literal ;
  147: 
  148: : compile-compile-2literal ( n1 n2 -- )
  149:     compile-2literal postpone compile-2literal ;
  150: 
  151: : [[ ( -- )
  152: \G switch from postpone state to compile state
  153:     \ this is only a marker; it is never really interpreted
  154:     compile-only-error ; immediate
  155: 
  156: [ifdef] compiler1
  157: : postponer1 ( c-addr u -- ... xt )
  158:     2dup find-name
  159:     [ifdef] run-prelude run-prelude [then]
  160:     dup if ( c-addr u nt )
  161: 	nip nip name>comp
  162: 	2dup [comp'] [[ d= if
  163: 	    2drop ['] compiler1 is parser1 ['] noop
  164: 	else
  165: 	    ['] postpone,
  166: 	endif
  167:     else
  168: 	drop
  169: 	2dup 2>r snumber? dup if
  170: 	    0> IF
  171: 		['] compile-compile-2literal
  172:             ELSE
  173:                 ['] compile-compile-literal
  174: 	    THEN
  175: 	    2rdrop
  176: 	ELSE
  177: 	    drop 2r> no.extensions
  178: 	THEN
  179:     then ;
  180: 
  181: : ]] ( -- )
  182:     \ switch into postpone state
  183:     ['] postponer1 is parser1 state on ; immediate restrict
  184: 
  185: [then]
  186: 
  187: \ f.rdp
  188: 
  189: : push-right ( c-addr u1 u2 cfill -- )
  190:     \ move string at c-addr u1 right by u2 chars (without exceeding
  191:     \ the original bound); fill the gap with cfill
  192:     >r over min dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr )
  193:     dup 2swap /string cmove>
  194:     r> r> r> fill ;
  195: 
  196: : f>buf-rdp-try { f: rf c-addr ur nd up um1 -- um2 }
  197:     \ um1 is the mantissa length to try, um2 is the actual mantissa length
  198:     c-addr ur um1 /string '0 fill
  199:     rf c-addr um1 represent if { nexp fsign }
  200: 	nd nexp + up >=
  201: 	ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if
  202: 	    \ fixed-point notation
  203: 	    c-addr ur beforep nexp - dup { befored } '0 push-right
  204:             befored 1+ ur >= if \ <=1 digit left, will be pushed out by '.'
  205:                 rf fabs f2* 0.1e nd s>d d>f f** f> if \ round last digit
  206:                     '1 c-addr befored + 1- c!
  207:                 endif
  208:             endif
  209: 	    c-addr beforep 1- befored min dup { beforez } 0 max bl fill
  210: 	    fsign if
  211: 		'- c-addr beforez 1- 0 max + c!
  212: 	    endif
  213: 	    c-addr ur beforep /string 1 '. push-right
  214: 	    nexp nd +
  215: 	else \ exponential notation
  216: 	    c-addr ur 1 /string 1 '. push-right
  217: 	    fsign if
  218: 		c-addr ur 1 '- push-right
  219: 	    endif
  220: 	    nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen }
  221: 	    ur explen - 1- fsign + { mantlen }
  222: 	    mantlen 0< if \ exponent too large
  223: 		drop c-addr ur '* fill
  224: 	    else
  225: 		c-addr ur + 0 explen negate /string move
  226: 	    endif
  227: 	    #>> mantlen
  228: 	endif
  229:     else \ inf or nan
  230: 	if \ negative
  231: 	    c-addr ur 1 '- push-right
  232: 	endif
  233: 	drop ur
  234: 	\ !! align in some way?
  235:     endif
  236:     1 max ur min ;
  237: 
  238: : f>buf-rdp ( rf c-addr +nr +nd +np -- ) \ gforth
  239: \G Convert @i{rf} into a string at @i{c-addr nr}.  The conversion
  240: \G rules and the meanings of @i{nr nd np} are the same as for
  241: \G @code{f.rdp}.
  242:     \ first, get the mantissa length, then convert for real.  The
  243:     \ mantissa length is wrong in a few cases because of different
  244:     \ rounding; In most cases this does not matter, because the
  245:     \ mantissa is shorter than expected and the final digits are 0;
  246:     \ but in a few cases the mantissa gets longer.  Then it is
  247:     \ conceivable that you will see a result that is rounded too much.
  248:     \ However, I have not been able to construct an example where this
  249:     \ leads to an unexpected result.
  250:     swap 0 max swap 0 max
  251:     fdup 2over 2over 2 pick f>buf-rdp-try f>buf-rdp-try drop ;
  252: 
  253: : f>str-rdp ( rf +nr +nd +np -- c-addr nr ) \ gforth
  254: \G Convert @i{rf} into a string at @i{c-addr nr}.  The conversion
  255: \G rules and the meanings of @i{nr +nd np} are the same as for
  256: \G @code{f.rdp}.  The result in in the pictured numeric output buffer
  257: \G and will be destroyed by anything destroying that buffer.
  258:     rot holdptr @ 1- 0 rot negate /string ( rf +nd np c-addr nr )
  259:     over holdbuf u< -&17 and throw
  260:     2tuck 2>r f>buf-rdp 2r> ;
  261: 
  262: : f.rdp ( rf +nr +nd +np -- ) \ gforth
  263: \G Print float @i{rf} formatted.  The total width of the output is
  264: \G @i{nr}.  For fixed-point notation, the number of digits after the
  265: \G decimal point is @i{+nd} and the minimum number of significant
  266: \G digits is @i{np}.  @code{Set-precision} has no effect on
  267: \G @code{f.rdp}.  Fixed-point notation is used if the number of
  268: \G siginicant digits would be at least @i{np} and if the number of
  269: \G digits before the decimal point would fit.  If fixed-point notation
  270: \G is not used, exponential notation is used, and if that does not
  271: \G fit, asterisks are printed.  We recommend using @i{nr}>=7 to avoid
  272: \G the risk of numbers not fitting at all.  We recommend
  273: \G @i{nr}>=@i{np}+5 to avoid cases where @code{f.rdp} switches to
  274: \G exponential notation because fixed-point notation would have too
  275: \G few significant digits, yet exponential notation offers fewer
  276: \G significant digits.  We recommend @i{nr}>=@i{nd}+2, if you want to
  277: \G have fixed-point notation for some numbers.  We recommend
  278: \G @i{np}>@i{nr}, if you want to have exponential notation for all
  279: \G numbers.
  280:     f>str-rdp type ;
  281: 
  282: 0 [if]
  283: : testx ( rf ur nd up -- )
  284:     '| emit f.rdp ;
  285: 
  286: : test ( -- )
  287:     -0.123456789123456789e-20
  288:     40 0 ?do
  289: 	cr
  290: 	fdup 7 3 1 testx
  291: 	fdup 7 3 4 testx
  292: 	fdup 7 3 0 testx
  293: 	fdup 7 7 1 testx
  294: 	fdup 7 5 1 testx
  295: 	fdup 7 0 2 testx
  296: 	fdup 5 2 1 testx
  297: 	fdup 4 2 1 testx
  298: 	fdup 18 8 5 testx
  299: 	'| emit
  300: 	10e f*
  301:     loop ;
  302: [then]
  303: 
  304: : f.s ( -- ) \ gforth f-dot-s
  305: \G Display the number of items on the floating-point stack, followed
  306: \G by a list of the items (but not more than specified by
  307: \G @code{maxdepth-.s}; TOS is the right-most item.
  308:     ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 
  309:     ?DO  dup i - 1- floats fp@ + f@ 16 5 11 f.rdp space LOOP  drop ; 
  310: 
  311: \ defer stuff
  312: 
  313: [ifundef] defer@ : defer@ >body @ ; [then]
  314: 
  315: :noname    ' defer@ ;
  316: :noname    postpone ['] postpone defer@ ;
  317: interpret/compile: action-of ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
  318: \G @i{Xt} is the XT that is currently assigned to @i{name}.
  319: 
  320: ' action-of
  321: comp' action-of drop
  322: interpret/compile: what's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth-obsolete
  323: \G Old name of @code{action-of}
  324: 
  325: 
  326: : typewhite ( addr n -- ) \ gforth
  327: \G Like type, but white space is printed instead of the characters.
  328:     \ bounds u+do
  329:     0 max bounds ?do
  330: 	i c@ #tab = if \ check for tab
  331: 	    #tab
  332: 	else
  333: 	    bl
  334: 	then
  335: 	emit
  336:     loop ;
  337: 
  338: \ w and l stuff
  339: 
  340: environment-wordlist >order
  341: 
  342: 16 address-unit-bits / 1 max constant /w ( -- u ) \ gforth slash-w
  343: \G address units for a 16-bit value
  344:     
  345: 32 address-unit-bits / 1 max constant /l ( -- u ) \ gforth slash-l
  346: \G address units for a 32-bit value
  347: 
  348: previous
  349: 
  350: [ifdef] uw@
  351: \ Open firmware names
  352: ' uw@ alias w@ ( addr -- u )
  353: ' ul@ alias l@ ( addr -- u )
  354: \ ' sw@ alias <w@ ( addr -- n )
  355: [then]
  356: 
  357: \ safe output redirection
  358: 
  359: : outfile-execute ( ... xt file-id -- ... ) \ gforth
  360:     \G execute @i{xt} with the output of @code{type} etc. redirected to
  361:     \G @i{file-id}.
  362:     outfile-id { oldfid } try
  363: 	to outfile-id execute 0
  364:     restore
  365: 	oldfid to outfile-id
  366:     endtry
  367:     throw ;
  368: 
  369: : infile-execute ( ... xt file-id -- ... ) \ gforth
  370:     \G execute @i{xt} with the input of @code{key} etc. redirected to
  371:     \G @i{file-id}.
  372:     infile-id { oldfid } try
  373: 	to infile-id execute 0
  374:     restore
  375: 	oldfid to infile-id
  376:     endtry
  377:     throw ;
  378: 
  379: \ safe BASE wrapper
  380: 
  381: : base-execute ( i*x xt u -- j*x ) \ gforth
  382:     \G execute @i{xt} with the content of @code{BASE} being @i{u}, and
  383:     \G restoring the original @code{BASE} afterwards.
  384:     base @ { oldbase } \ use local, because TRY blocks the return stack
  385:     try
  386: 	base ! execute 0
  387:     restore
  388: 	oldbase base !
  389:     endtry
  390:     throw ;
  391: 
  392: \ th
  393: 
  394: : th ( addr1 u -- addr2 )
  395:     cells + ;
  396: 
  397: \ \\\ - skip to end of file
  398: 
  399: : \\\ ( -- ) \ gforth
  400:     \G skip remaining source file
  401:     source-id dup 0> IF
  402: 	>r r@ file-size throw r> reposition-file throw
  403: 	BEGIN  refill 0= UNTIL  postpone \  THEN ; immediate

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