X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;ds=sidebyside;f=scheme.4th;h=f96fec938b97ee8267c4b3a257cff6b62d2b8668;hb=7e44c5ca79a16106aefa315ccf38e74dcd365554;hp=7ac6355287f14b249c1a201d0de7d517756fc81d;hpb=a966a509dd23259423e21c55d973403b88b86ea4;p=scheme.forth.jl.git diff --git a/scheme.4th b/scheme.4th index 7ac6355..f96fec9 100644 --- a/scheme.4th +++ b/scheme.4th @@ -180,7 +180,7 @@ console-i/o-port obj@ current-input-port obj! objvar symbol-table : duplicate-charlist ( charlist -- copy ) - 2dup nil objeq? false = if + nil? false = if 2dup car 2swap cdr recurse cons then ; @@ -336,7 +336,7 @@ objvar vals : 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 @@ -408,7 +408,9 @@ global-env obj! 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 @@ -418,11 +420,13 @@ objvar macro-table 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 -- ) @@ -442,6 +446,8 @@ objvar macro-table set-cdr! exit then + + cdr repeat 2drop @@ -1029,6 +1035,31 @@ parse-idx-stack parse-idx-sp ! : 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? ; @@ -1040,7 +1071,7 @@ parse-idx-stack parse-idx-sp ! : if-alternative ( ifobj -- alt|false ) cdr cdr cdr - 2dup nil objeq? if + nil? if 2drop false else car @@ -1080,14 +1111,14 @@ parse-idx-stack parse-idx-sp ! 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 @@ -1157,7 +1188,7 @@ parse-idx-stack parse-idx-sp ! 2swap ; -: apply ( proc argvals ) +: apply ( proc argvals -- result ) 2swap dup case primitive-proc-type of drop execute @@ -1179,11 +1210,24 @@ parse-idx-stack parse-idx-sp ! 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 @@ -1248,24 +1292,31 @@ parse-idx-stack parse-idx-sp ! application? if - 2over 2over - operator + 2over 2over ( env exp env exp ) + operator 2dup ( env exp env opname opname ) - find-macro-proc nil objeq? if + lookup-macro nil? if \ Regular function application - 2swap eval - -2rot - operands 2swap list-of-vals + 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 - 2swap 2drop 2swap ( env mproc exp ) + ( env exp env opname mproc ) + 2swap 2drop -2rot 2drop cdr ( env mproc body ) - apply 2swap ( expanded-exp env ) + 2dup print cr + macro-expand + 2dup print cr + 2swap ['] eval goto-deferred then exit @@ -1471,6 +1522,49 @@ variable gc-stack-depth \ }}} +\ ---- 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 -- ) @@ -1503,7 +1597,7 @@ variable gc-stack-depth arg-count-error then else - -rot 2dup nil objeq? if + -rot nil? if arg-count-error then @@ -1526,58 +1620,6 @@ include scheme-primitives.4th \ }}} -\ ---- 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 - -\ }}} - \ ---- REPL ---- : repl