;
-: 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+ @
nil nil nil extend-env
global-env obj!
+\ }}}
+
+\ ---- Primitives ---- {{{
+
+: make-primitive ( cfa -- )
+ bl word
+ count
+
+ \ 2dup ." Defining primitive " type ." ..." cr
+
+ cstr>charlist
+ charlist>symbol
+
+ rot primitive-proc-type ( var prim )
+ global-env obj@ define-var
+;
+
+: arg-count-error
+ bold fg red ." Incorrect argument count." reset-term cr
+ abort
+;
+
+: ensure-arg-count ( args n -- )
+ dup 0= if
+ drop nil objeq? false = if
+ arg-count-error
+ then
+ else
+ -rot nil? if
+ arg-count-error
+ then
+
+ cdr rot 1- recurse
+ then
+;
+
+: arg-type-error
+ bold fg red ." Incorrect argument type." reset-term cr
+ abort
+;
+
+: ensure-arg-type ( arg type -- arg )
+ istype? false = if
+ arg-type-error
+ then
+;
+
+
\ }}}
\ ---- Macros ---- {{{
: make-lambda ( params body -- lambda-exp )
lambda-symbol -2rot cons cons ;
-: definition-var ( obj -- var )
- cdr car
- symbol-type istype? false = if car then
-;
+( Handles recursive expansion of defines in
+ terms of nested lambdas. Most Schemes only
+ handle one level of expansion! )
+: (definition-var-val) ( val var -- val' var' )
+ symbol-type istype? if 2swap car 2swap exit then
-: definition-val ( obj -- val )
- 2dup cdr car symbol-type istype? if
- 2drop
- cdr cdr car
- else
- cdr 2swap cdr cdr
- make-lambda
+ 2dup cdr 2swap car
+ symbol-type istype? if
+ 2swap ( body procname procargs )
+ 2rot ( procname procargs body )
+ make-lambda ( procname lambda-exp )
+ 2swap
+ exit
then
+
+ ( body procargs nextval )
+ -2rot 2swap ( nextval procargs body )
+ make-lambda nil cons ( nextval lambda-exp )
+ 2swap ( lambda-exp nextval )
+ recurse
+;
+
+: definition-var-val ( obj -- var val )
+ cdr 2dup cdr 2swap car
+ (definition-var-val)
+ 2swap
;
: assignment? ( obj -- obj bool )
cdr cdr car ;
: eval-definition ( obj env -- res )
- 2swap
- 2over 2over ( env obj env obj )
- definition-val 2swap ( env obj valexp env )
- eval ( env obj val )
-
- 2swap definition-var 2swap ( env var val )
+ 2dup 2rot ( env env obj )
+ definition-var-val ( env env var val )
+ 2rot eval ( env var val )
2rot ( var val env )
define-var
( Ensure terminating symbol arg name is handled
specially to allow for variadic procedures. )
: flatten-proc-args ( argvals argnames -- argvals' argnames' )
- nil? if exit then
+ nil? if
+ 2over nil? false = if
+ bold fg red ." Too many arguments supplied to compound method. Aborting." reset-term cr
+ abort
+ else
+ 2drop
+ then
+ exit
+ then
symbol-type istype? if
nil cons
exit
then
- 2over cdr 2over cdr
+ 2over
+ nil? if
+ bold fg red ." Too few arguments supplied to compound method. Aborting." reset-term cr
+ abort
+ else
+ cdr
+ then
+
+ 2over cdr
+
recurse ( argvals argnames argvals'' argnames'' )
2rot car 2swap cons ( argvals argvals'' argnames' )
2rot car 2rot cons ( argnames' argvals' )
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 ( env exp env exp )
- operator 2dup ( env exp env opname opname )
+ operator ( env exp env opname )
+
+ 2dup lookup-macro nil? false = if
+ \ Macro function evaluation
+
+ ( env exp env opname mproc )
+ 2swap 2drop -2rot 2drop cdr ( env mproc body )
+
+ 2dup print cr
+ macro-expand
+ 2dup print cr
- lookup-macro nil? if
- \ Regular function application
+ 2swap
+ ['] eval goto-deferred
+ else
+ \ 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
- else
- \ Macro function evaluation
-
- ." Macro eval"
-
- ( env exp env opname mproc )
- 2swap 2drop -2rot 2drop cdr ( env mproc body )
-
- \ TODO: evaluate macro procedure on expression body
- ." ABORTED: Macros not yet fully implemented!" abort
+ exit
then
- exit
then
bold fg red ." Error evaluating expression - unrecognized type. Aborting." reset-term cr
\ }}}
-\ ---- Primitives ---- {{{
-
-: make-primitive ( cfa -- )
- bl word
- count
-
- \ 2dup ." Defining primitive " type ." ..." cr
-
- cstr>charlist
- drop symbol-type
-
- 2dup
-
- symbol-table obj@
- cons
- symbol-table obj!
-
- rot primitive-proc-type ( var prim )
- global-env obj@ define-var
-;
-
-: arg-count-error
- bold fg red ." Incorrect argument count." reset-term cr
- abort
-;
-
-: ensure-arg-count ( args n -- )
- dup 0= if
- drop nil objeq? false = if
- arg-count-error
- then
- else
- -rot nil? if
- arg-count-error
- then
-
- cdr rot 1- recurse
- then
-;
-
-: arg-type-error
- bold fg red ." Incorrect argument type." reset-term cr
- abort
-;
-
-: ensure-arg-type ( arg type -- arg )
- istype? false = if
- arg-type-error
- then
-;
-
-include scheme-primitives.4th
-
-\ }}}
-
\ ---- Loading files ---- {{{
: charlist>cstr ( charlist addr -- n )
again
;
-:noname ( args -- finalResult )
- 2dup 1 ensure-arg-count
- car string-type ensure-arg-type
+\ }}}
+
+\ ---- Standard Library ---- {{{
- drop pair-type
- pad charlist>cstr
- pad swap load
-; make-primitive load
+ include scheme-primitives.4th
+ s" scheme-library.scm" load 2drop
+
\ }}}
\ ---- REPL ----
The Lambda Lab / projects / scheme.forth.jl.git / blobdiff