objvar symbol-table
: duplicate-charlist ( charlist -- copy )
- 2dup nil objeq? false = if
+ nil? false = if
2dup car 2swap cdr recurse cons
then ;
;
-: cstr>charlist ( addr n -- symbol-obj )
+: cstr>charlist ( addr n -- charlist )
dup 0= if
2drop nil
else
count
cstr>charlist
- drop symbol-type
-
- 2dup
-
- symbol-table obj@
- cons
- symbol-table obj!
+ charlist>symbol
create swap , ,
does> dup @ swap 1+ @
create-symbol lambda lambda-symbol
create-symbol λ λ-symbol
create-symbol begin begin-symbol
+create-symbol apply apply-symbol
\ }}}
: get-vars-vals ( var env -- vars? vals? bool )
begin
- 2dup nil objeq? false =
+ nil? false =
while
2over 2over first-frame
get-vars-vals-frame if
objvar macro-table
-: lookup-macro ( name_symbol -- proc? bool )
+( Look up macro in macro table. Returns nil if
+ no macro is found. )
+: lookup-macro ( name_symbol -- proc )
macro-table obj@
begin
car car objeq? if
2swap 2drop
car cdr
- true exit
+ exit
then
+
+ cdr
repeat
- 2drop false
+ 2swap 2drop
;
: make-macro ( name_symbol params body env -- )
set-cdr!
exit
then
+
+ cdr
repeat
2drop
: macro-definition? ( obj -- obj bool )
define-macro-symbol tagged-list? ;
+: macro-definition-name ( exp -- mname )
+ cdr car car ;
+
+: macro-definition-params ( exp -- params )
+ cdr car cdr ;
+
+: macro-definition-body ( exp -- body )
+ cdr cdr ;
+
+objvar env
+: eval-define-macro ( obj env -- res )
+ env obj!
+
+ 2dup macro-definition-name 2swap ( name obj )
+ 2dup macro-definition-params 2swap ( name params obj )
+ macro-definition-body ( name params body )
+
+ env obj@ ( name params body env )
+
+ make-macro
+
+ ok-symbol
+;
+hide env
+
: if? ( obj -- obj bool )
if-symbol tagged-list? ;
: if-alternative ( ifobj -- alt|false )
cdr cdr cdr
- 2dup nil objeq? if
+ nil? if
2drop false
else
car
2swap ( env explist )
\ Abort on empty list
- 2dup nil objeq? if
+ nil? if
2drop none
2swap exit
then
begin
2dup cdr ( env explist nextexplist )
- 2dup nil objeq? false =
+ nil? false =
while
-2rot car 2over ( nextexplist env exp env )
eval
2swap
;
-: apply ( proc argvals )
+: apply ( proc argvals -- result )
2swap dup case
primitive-proc-type of
- drop execute
+ drop execute
endof
compound-proc-type of
R> drop ['] eval goto-deferred \ Tail call optimization
endof
- bold fg red ." Object not applicable. Aboring." reset-term cr
+ bold fg red ." Object not applicable. Aborting." reset-term cr
abort
endcase
;
+: macro-expand ( proc expbody -- result )
+ 2swap
+ 2dup procedure-body ( expbody proc procbody )
+ -2rot 2dup procedure-params ( procbody expbody proc argnames )
+ -2rot procedure-env ( procbody argnames expbody procenv )
+
+ -2rot 2swap
+ flatten-proc-args
+ 2swap 2rot
+
+ extend-env eval-sequence eval
+;
+
:noname ( obj env -- result )
2swap
application? if
- 2over 2over
- operator
+ 2over 2over ( env exp env exp )
+ operator ( env exp env opname )
+
+ 2dup apply-symbol objeq? if
- find-macro-proc nil objeq? if
- \ Regular function application
+ 2drop 2swap ( env env exp )
+ cdr 2dup car 2rot ( env expbody real-opname env )
+ eval ( env expbody proc )
+ 2swap cdr
+ nil? false = if car then ( env proc real-operand )
- 2swap eval
- -2rot
- operands 2swap list-of-vals
+ 2rot eval ( proc argvals )
+
+ pair-type istype? false = if
+ bold fg red ." Error: apply requires a list of operand arguments." cr
+ reset-term abort
+ then
apply
- else
- \ Macro function evaluation
+ exit
+ then
- 2swap 2drop 2swap ( env mproc exp )
+ 2dup lookup-macro nil? false = if
+ \ Macro function evaluation
- apply 2swap ( expanded-exp env )
+ ( env exp env opname mproc )
+ 2swap 2drop -2rot 2drop cdr ( env mproc body )
+ 2dup print cr
+ macro-expand
+ 2dup print cr
+
+ 2swap
['] eval goto-deferred
then
+
+ \ Regular function application
+
+ 2drop ( env exp env opname )
+
+ 2swap eval ( env exp proc )
+ -2rot ( proc env exp )
+ operands 2swap ( proc operands env )
+ list-of-vals ( proc argvals )
+
+ apply
exit
then
\ }}}
+\ ---- Loading files ---- {{{
+
+: charlist>cstr ( charlist addr -- n )
+
+ dup 2swap ( origaddr addr charlist )
+
+ begin
+ nil? false =
+ while
+ 2dup cdr 2swap car
+ drop ( origaddr addr charlist char )
+ -rot 2swap ( origaddr charlist addr char )
+ over !
+ 1+ -rot ( origaddr nextaddr charlist )
+ repeat
+
+ 2drop ( origaddr finaladdr )
+ swap -
+;
+
+: load ( addr n -- finalResult )
+ open-input-file
+
+ empty-parse-str
+
+ ok-symbol ( port res )
+
+ begin
+ 2over read-port ( port res obj )
+
+ 2dup EOF character-type objeq? if
+ 2drop 2swap close-port
+ exit
+ then
+
+ 2swap 2drop ( port obj )
+
+ global-env obj@ eval ( port res )
+ again
+;
+
+\ }}}
+
\ ---- Primitives ---- {{{
: make-primitive ( cfa -- )
\ 2dup ." Defining primitive " type ." ..." cr
cstr>charlist
- drop symbol-type
-
- 2dup
-
- symbol-table obj@
- cons
- symbol-table obj!
-
+ charlist>symbol
+
rot primitive-proc-type ( var prim )
global-env obj@ define-var
;
arg-count-error
then
else
- -rot 2dup nil objeq? if
+ -rot nil? if
arg-count-error
then
\ }}}
-\ ---- Loading files ---- {{{
-
-: charlist>cstr ( charlist addr -- n )
-
- dup 2swap ( origaddr addr charlist )
-
- begin
- 2dup nil objeq? false =
- while
- 2dup cdr 2swap car
- drop ( origaddr addr charlist char )
- -rot 2swap ( origaddr charlist addr char )
- over !
- 1+ -rot ( origaddr nextaddr charlist )
- repeat
-
- 2drop ( origaddr finaladdr )
- swap -
-;
-
-: load ( addr n -- finalResult )
- open-input-file
-
- empty-parse-str
-
- ok-symbol ( port res )
-
- begin
- 2over read-port ( port res obj )
-
- 2dup EOF character-type objeq? if
- 2drop 2swap close-port
- exit
- then
-
- 2swap 2drop ( port obj )
-
- global-env obj@ eval ( port res )
- again
-;
-
-:noname ( args -- finalResult )
- 2dup 1 ensure-arg-count
- car string-type ensure-arg-type
-
- drop pair-type
- pad charlist>cstr
- pad swap load
-; make-primitive load
+\ ---- Standard Library ---- {{{
+ s" scheme-library.scm" load 2drop
+
\ }}}
\ ---- REPL ----
The Lambda Lab / projects / scheme.forth.jl.git / blobdiff