version 1.17, 2000/11/13 22:10:30
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version 1.26, 2003/01/24 22:03:20
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Line 66 AUser CSP
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Line 66 AUser CSP
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\G equivalent to @code{] literal} |
\G equivalent to @code{] literal} |
] postpone literal ; |
] postpone literal ; |
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[ifundef] in-dictionary? |
: in-dictionary? ( x -- f ) |
: in-dictionary? ( x -- f ) |
forthstart dictionary-end within ; |
forthstart dictionary-end within ; |
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[endif] |
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: in-return-stack? ( addr -- f ) |
: in-return-stack? ( addr -- f ) |
rp0 @ swap - [ forthstart 6 cells + ]L @ u< ; |
rp0 @ swap - [ forthstart 6 cells + ]L @ u< ; |
Line 75 AUser CSP
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Line 77 AUser CSP
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\ const-does> |
\ const-does> |
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: compile-literals ( w*u u -- ; run-time: -- w*u ) recursive |
: compile-literals ( w*u u -- ; run-time: -- w*u ) recursive |
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\ compile u literals, starting with the bottommost one |
?dup-if |
?dup-if |
swap >r 1- compile-literals |
swap >r 1- compile-literals |
r> POSTPONE literal |
r> POSTPONE literal |
endif ; |
endif ; |
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: compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive |
: compile-fliterals ( r*u u -- ; run-time: -- w*u ) recursive |
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\ compile u fliterals, starting with the bottommost one |
?dup-if |
?dup-if |
{ F: r } 1- compile-fliterals |
{ F: r } 1- compile-fliterals |
r POSTPONE fliteral |
r POSTPONE fliteral |
endif ; |
endif ; |
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: (const-does>) ( w*uw r*ur uw ur target "name" -- ) |
: (const-does>) ( w*uw r*ur uw ur target "name" -- ) |
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\ define a colon definition "name" containing w*uw r*ur as |
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\ literals and a call to target. |
{ uw ur target } |
{ uw ur target } |
header docol: cfa, \ start colon def without stack junk |
header docol: cfa, \ start colon def without stack junk |
ur compile-fliterals uw compile-literals |
ur compile-fliterals uw compile-literals |
target compile, POSTPONE exit reveal ; |
target compile, POSTPONE exit reveal ; |
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: const-does> ( run-time: w*uw r*ur uw ur "name" -- ) |
: const-does> ( run-time: w*uw r*ur uw ur "name" -- ) |
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\G Defines @var{name} and returns.@sp 0 |
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\G @var{name} execution: pushes @var{w*uw r*ur}, then performs the |
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\G code following the @code{const-does>}. |
here >r 0 POSTPONE literal |
here >r 0 POSTPONE literal |
POSTPONE (const-does>) |
POSTPONE (const-does>) |
POSTPONE ; |
POSTPONE ; |
noname : POSTPONE rdrop |
noname : POSTPONE rdrop |
lastxt r> cell+ ! \ patch the literal |
lastxt r> cell+ ! \ patch the literal |
; immediate |
; immediate |
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\ !! rewrite slurp-file using slurp-fid |
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: slurp-file ( c-addr1 u1 -- c-addr2 u2 ) |
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\G @var{c-addr1 u1} is the filename, @var{c-addr2 u2} is the file's contents |
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r/o bin open-file throw >r |
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r@ file-size throw abort" file too large" |
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dup allocate throw swap |
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2dup r@ read-file throw over <> abort" could not read whole file" |
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r> close-file throw ; |
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: slurp-fid { fid -- addr u } |
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\G @var{addr u} is the content of the file @var{fid} |
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0 0 begin ( awhole uwhole ) |
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dup 1024 + dup >r extend-mem ( anew awhole uwhole R: unew ) |
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rot r@ fid read-file throw ( awhole uwhole uread R: unew ) |
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r> 2dup = |
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while ( awhole uwhole uread unew ) |
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2drop |
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repeat |
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- + dup >r resize throw r> ; |
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\ ]] ... [[ |
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: compile-literal ( n -- ) |
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postpone literal ; |
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: [[ ( -- ) |
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\G switch from postpone state to compile state |
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\ this is only a marker; it is never really interpreted |
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compile-only-error ; immediate |
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: postponer ( c-addr u -- ) |
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2dup find-name dup if ( c-addr u nt ) |
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nip nip name>comp |
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2dup [comp'] [[ d= if |
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2drop ['] compiler is parser |
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else |
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postpone, |
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endif |
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else |
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drop |
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2dup snumber? dup if |
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0> IF |
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swap postpone literal postpone compile-literal |
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THEN |
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postpone Literal postpone compile-literal |
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2drop |
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ELSE |
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drop no.extensions |
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THEN |
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then ; |
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: ]] ( -- ) |
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\ switch into postpone state |
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['] postponer is parser state on ; immediate restrict |
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\ f.rdp |
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: move-right ( c-addr u1 u2 cfill -- ) |
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\ move string at c-addr u1 right by u2 chars (without exceeding |
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\ the original bound); fill the gap with cfill |
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>r dup >r rot dup >r ( u1 u2 c-addr R: cfill u2 c-addr ) |
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dup 2swap /string cmove> |
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r> r> r> fill ; |
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: f>buf-rdp { f: rf c-addr ur nd up -- } \ gforth |
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\G Convert @i{rf} into a string at @i{c-addr ur}. The conversion |
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\G rules and the meanings of @i{ur nd up} are the same as for |
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\G @code{f.rdp}. |
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rf c-addr ur represent if { nexp fsign } |
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nd nexp + up >= |
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ur nd - 1- dup { beforep } fsign + nexp 0 max >= and if |
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\ fixed-point notation |
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c-addr ur beforep nexp - dup { befored } '0 move-right |
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c-addr beforep 1- befored min dup { beforez } 0 max bl fill |
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fsign if |
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'- c-addr beforez 1- 0 max + c! |
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endif |
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c-addr ur beforep /string 1 '. move-right |
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else \ exponential notation |
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c-addr ur 1 /string 1 '. move-right |
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fsign if |
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c-addr ur 1 '- move-right |
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endif |
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nexp 1- s>d tuck dabs <<# #s rot sign 'E hold #> { explen } |
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explen 1+ fsign - ur > if \ exponent too large |
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drop c-addr ur '* fill |
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else |
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c-addr ur + 0 explen negate /string move |
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endif |
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#>> |
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endif |
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else \ inf or nan |
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if \ negative |
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c-addr ur 1 '- move-right |
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endif |
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drop |
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\ !! align in some way? |
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endif ; |
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: f>str-rdp ( rf ur +nd up -- c-addr ur ) \ gforth |
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\G Convert @i{rf} into a string at @i{c-addr ur}. The conversion |
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\G rules and the meanings of @i{ur +nd up} are the same as for |
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\G @code{f.rdp}. The result in in the pictured numeric output buffer |
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\G and will be destroyed by anything destroying that buffer. |
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rot holdptr @ 1- 0 rot negate /string ( rf +nd up c-addr ur ) |
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over holdbuf u< -&17 and throw |
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2tuck 2>r f>buf-rdp 2r> ; |
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: f.rdp ( rf ur +nd up -- ) \ gforth |
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\G Print float @i{rf} formatted. The total width of the output is |
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\G @i{nr}, the number of digits after the decimal point is @i{+nd}, |
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\G the minimum number of significant digits for fixed-point notation |
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\G is @i{up}. @code{Set-precision} has no effect on @code{f.rdp}. |
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\G Fixed-point notation is used if the number of siginicant digits |
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\G would be larger than @i{up} and if the number of digits before the |
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\G decimal point would fit. If fixed-point notation is not used, |
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\G exponential notation is used, and if that does not fit, asterisks |
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\G are printed. We recommend using @i{ur}>=7 to avoid the risk of |
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\G numbers not fitting at all. We recommend @i{ur}>=@i{up}+5 to avoid |
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\G cases where @code{f.rdp} switches to exponential notation because |
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\G fixed-point notation would have too few significant digits, yet |
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\G exponential notation offers fewer significant digits. We recomment |
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\G @i{ur}>=@i{nd}+2, if you want to have fixed-point notation for some |
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\G numbers. Currently, trailing digits are cut off. |
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f>str-rdp type ; |
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0 [if] |
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: testx ( rf ur nd up -- ) |
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'| emit f.rdp ; |
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: test ( -- ) |
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-0.123456789123456789e-20 |
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40 0 ?do |
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cr |
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fdup 7 3 1 testx |
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fdup 7 3 4 testx |
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fdup 7 3 0 testx |
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fdup 7 7 1 testx |
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fdup 7 5 1 testx |
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fdup 7 0 2 testx |
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fdup 5 2 1 testx |
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fdup 4 2 1 testx |
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fdup 18 8 5 testx |
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'| emit |
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10e f* |
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loop ; |
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[then] |