version 1.16, 1999/05/05 12:04:41
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version 1.17, 1999/05/06 21:33:37
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Line 26 hex \ everything now hex!
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Line 26 hex \ everything now hex!
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\ "a true flag ... [is] a single-cell value with all bits set" |
\ "a true flag ... [is] a single-cell value with all bits set" |
\ better definition: 0 0= constant true ( no dependence on 2's compl) |
\ better definition: 0 0= constant true ( no dependence on 2's compl) |
-1 Constant true ( -- f ) \ core-ext |
-1 Constant true ( -- f ) \ core-ext |
\G CONSTANT: @var{f} is a cell with all bits set. |
\G CONSTANT: @i{f} is a cell with all bits set. |
\ see starts looking for primitives after this word! |
\ see starts looking for primitives after this word! |
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0 Constant false ( -- f ) \ core-ext |
0 Constant false ( -- f ) \ core-ext |
\G CONSTANT: @var{f} is a cell with all bits clear. |
\G CONSTANT: @i{f} is a cell with all bits clear. |
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[IFUNDEF] cell |
[IFUNDEF] cell |
1 cells Constant cell ( -- u ) \ gforth |
1 cells Constant cell ( -- u ) \ gforth |
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\G CONSTANT: the number of address units corresponding to 1 cell. |
[THEN] |
[THEN] |
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1 floats Constant float ( -- u ) \ gforth |
1 floats Constant float ( -- u ) \ gforth |
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\G CONSTANT: the number of address units corresponding to a floating-point number. |
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20 Constant bl ( -- c-char ) \ core |
20 Constant bl ( -- c-char ) \ core |
\G @var{c-char} is the character value for a space. |
\G @i{c-char} is the character value for a space. |
\ used by docon:, must be constant |
\ used by docon:, must be constant |
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FF Constant /line |
FF Constant /line |
Line 107 AUser "error 0 "error !
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Line 110 AUser "error 0 "error !
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User tibstack \ saves >tib in execute |
User tibstack \ saves >tib in execute |
User >tib \ pointer to terminal input buffer |
User >tib \ pointer to terminal input buffer |
User #tib ( -- a-addr ) \ core-ext |
User #tib ( -- a-addr ) \ core-ext |
\G USER VARIABLE: @var{a-addr} is the address of a cell containing |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing |
\G the number of characters in the terminal input buffer. |
\G the number of characters in the terminal input buffer. |
\G OBSOLESCENT: @code{source} superceeds the function of this word. |
\G OBSOLESCENT: @code{source} superceeds the function of this word. |
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User >in ( -- a-addr ) \ core |
User >in ( -- a-addr ) \ core |
\G USER VARIABLE: @var{a-addr} is the address of a cell containing the |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing the |
\G char offset from the start of the terminal input buffer to the |
\G char offset from the start of the input buffer to the start of the |
\G start of the parse area. |
\G parse area. |
0 >in ! \ char number currently processed in tib |
0 >in ! \ char number currently processed in tib |
[THEN] |
[THEN] |
has? file [IF] |
has? file [IF] |
User blk ( -- a-addr ) \ block |
User blk ( -- a-addr ) \ block |
\G USER VARIABLE: @var{a-addr} is the address of a cell containing zero |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing zero |
\G (in which case the input source is not a block and can be identified |
\G (in which case the input source is not a block and can be identified |
\G by @code{source-id}) or the number of the block currently being |
\G by @code{source-id}) or the number of the block currently being |
\G interpreted. A Standard program should not alter @code{blk} directly. |
\G interpreted. A Standard program should not alter @code{blk} directly. |
Line 139 has? file [IF]
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Line 142 has? file [IF]
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[THEN] |
[THEN] |
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User base ( -- a-addr ) \ core |
User base ( -- a-addr ) \ core |
\G USER VARIABLE: @var{a-addr} is the address of a cell that stores the |
\G USER VARIABLE: @i{a-addr} is the address of a cell that stores the |
\G number base used by default for number conversion during input and output. |
\G number base used by default for number conversion during input and output. |
A base ! |
A base ! |
User dpl -1 dpl ! |
User dpl ( -- a-addr ) \ gforth |
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\G USER VARIABLE: @i{a-addr} is the address of a cell that stores the |
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\G position of the decimal point in the most recent numeric conversion. |
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\G Initialised to -1. After the conversion of a number containing no |
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\G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds |
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\G 0. After the conversion of 234123.9 it contains 1, and so forth. |
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-1 dpl ! |
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User state ( -- a-addr ) \ core,tools-ext |
User state ( -- a-addr ) \ core,tools-ext |
\G Recommended reading: @cite{@code{State}-smartness--Why it is evil |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing the |
\G and how to exorcise it}, |
\G compilation state flag. 0 => interpreting, -1 => compiling. A |
\G @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
\G program shall not directly alter the value of @code{state}. The |
\G version: Don't use @code{state}! @xref{Interpretation and |
\G following Standard words alter the value in @code{state}: @code{:} |
\G Compilation Semantics} for an alternative. USER VARIABLE: @var{a-addr} |
\G (colon) @code{;} (semicolon) @code{abort} @code{quit} |
\G is the address of a cell containing the compilation state flag. 0 |
\G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket) |
\G => interpreting, -1 => compiling. A program shall not directly |
\G @code{;code}. Don't use @code{state}! @xref{Interpretation and |
\G alter the value of @code{state}. The following Standard words |
\G Compilation Semantics} for an alternative. |
\G alter the value in @code{state}: @code{:} (colon) @code{;} |
\ Recommended reading: @cite{@code{State}-smartness--Why it is evil |
\G (semicolon) @code{abort} @code{quit} @code{:noname} @code{[} |
\ and how to exorcise it}, |
\G (left-bracket) @code{]} (right-bracket) @code{;code} |
\ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
0 state ! |
\ version: Don't use @code{state}! |
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0 state ! |
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AUser normal-dp \ the usual dictionary pointer |
AUser normal-dp \ the usual dictionary pointer |
AUser dpp normal-dp dpp ! |
AUser dpp normal-dp dpp ! |