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Adding first primitive procedure.
author
Tim Vaughan
<tgvaughan@gmail.com>
Tue, 19 Jul 2016 10:00:37 +0000
(22:00 +1200)
committer
Tim Vaughan
<tgvaughan@gmail.com>
Tue, 19 Jul 2016 10:00:37 +0000
(22:00 +1200)
scheme.4th
patch
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diff --git
a/scheme.4th
b/scheme.4th
index
1f02114
..
5c8f57d
100644
(file)
--- a/
scheme.4th
+++ b/
scheme.4th
@@
-13,6
+13,7
@@
include defer-is.4th
4 constant nil-type
5 constant pair-type
6 constant symbol-type
4 constant nil-type
5 constant pair-type
6 constant symbol-type
+7 constant primitive-type
: istype? ( obj type -- obj bool )
over = ;
: istype? ( obj type -- obj bool )
over = ;
@@
-257,8
+258,43
@@
global-env setobj
\ }}}
\ }}}
+\ ---- Primitives ---- {{{
+
+: make-primitive ( cfa -- )
+ bl word
+ count
+
+ (create-symbol)
+ drop symbol-type
+
+ 2dup
+
+ symbol-table fetchobj
+ cons
+ symbol-table setobj
+
+ rot primitive-type ( var prim )
+ global-env fetchobj define-var
+;
+
+: add-prim ( args -- )
+ nil objeq? if
+ 0 number-type
+ else
+ 2dup cdr recurse drop
+ -rot car drop
+ + number-type
+ then
+;
+
+' add-prim make-primitive +
+
+\ }}}
+
\ ---- Read ---- {{{
\ ---- Read ---- {{{
+defer read
+
variable parse-idx
variable stored-parse-idx
create parse-str 161 allot
variable parse-idx
variable stored-parse-idx
create parse-str 161 allot
@@
-566,8
+602,6
@@
parse-idx-stack parse-idx-sp !
symbol-table setobj
;
symbol-table setobj
;
-defer read
-
: readpair ( -- pairobj )
eatspaces
: readpair ( -- pairobj )
eatspaces
@@
-784,9
+818,31
@@
defer eval
then
;
then
;
-: true? ( boolobj -- bool
ean
)
+: true? ( boolobj -- bool )
false? invert ;
false? invert ;
+: applicaion? ( obj -- obj bool)
+ pair-type istype? ;
+
+: operator ( obj -- operator )
+ car ;
+
+: operands ( obj -- operands )
+ cdr ;
+
+: nooperands? ( operands -- bool )
+ cdr nil objeq? ;
+
+: first-operand ( operands -- operand )
+ car ;
+
+: rest-operands ( operands -- other-operands )
+ cdr ;
+
+: list-of-vals ( args env -- vals )
+
+;
+
:noname ( obj env -- result )
2swap
:noname ( obj env -- result )
2swap
@@
-830,6
+886,22
@@
defer eval
2swap ['] eval goto
then
2swap ['] eval goto
then
+ application? if
+ 2over 2over
+ operator 2swap eval
+
+ primitive-type istype? false = if
+ bold fg red ." Object not applicable. Aboring." reset-term cr
+ abort
+ then
+
+ -2rot
+ operands 2swap list-of-vals
+
+ 2swap drop execute
+ exit
+ then
+
bold fg red ." Error evaluating expression - unrecognized type. Aborting." reset-term cr
abort
; is eval
bold fg red ." Error evaluating expression - unrecognized type. Aborting." reset-term cr
abort
; is eval
@@
-838,6
+910,8
@@
defer eval
\ ---- Print ---- {{{
\ ---- Print ---- {{{
+defer print
+
: printnum ( numobj -- ) drop 0 .R ;
: printbool ( numobj -- )
: printnum ( numobj -- ) drop 0 .R ;
: printbool ( numobj -- )
@@
-887,7
+961,6
@@
defer eval
: printnil ( nilobj -- )
2drop ." ()" ;
: printnil ( nilobj -- )
2drop ." ()" ;
-defer print
: printpair ( pairobj -- )
2dup
car print
: printpair ( pairobj -- )
2dup
car print
@@
-897,6
+970,9
@@
defer print
." . " print
;
." . " print
;
+: printprim ( primobj -- )
+ 2drop ." <primitive procedure>" ;
+
:noname ( obj -- )
number-type istype? if printnum exit then
boolean-type istype? if printbool exit then
:noname ( obj -- )
number-type istype? if printnum exit then
boolean-type istype? if printbool exit then
@@
-905,6
+981,7
@@
defer print
symbol-type istype? if printsymbol exit then
nil-type istype? if printnil exit then
pair-type istype? if ." (" printpair ." )" exit then
symbol-type istype? if printsymbol exit then
nil-type istype? if printnil exit then
pair-type istype? if ." (" printpair ." )" exit then
+ primitive-type istype? if printprim exit then
bold fg red ." Error printing expression - unrecognized type. Aborting" reset-term cr
abort
bold fg red ." Error printing expression - unrecognized type. Aborting" reset-term cr
abort