mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
fbfe6784d2
- Add a `vec` built-in function in step7 so that `quasiquote` does not require `apply` from step9. - Introduce quasiquoteexpand special in order to help debugging step7. This may also prepare newcomers to understand step8. - Add soft tests. - Do not quote numbers, strings and so on. Should ideally have been in separate commits: - elisp: simplify and fix (keyword :k) - factor: fix copy/paste error in let*/step7, simplify eval-ast. - guile: improve list/vector types - haskell: revert evaluation during quasiquote - logo, make: cosmetic issues
635 lines
15 KiB
QBasic
Executable File
635 lines
15 KiB
QBasic
Executable File
GOTO MAIN
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REM $INCLUDE: 'mem.in.bas'
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REM $INCLUDE: 'types.in.bas'
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REM $INCLUDE: 'readline.in.bas'
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REM $INCLUDE: 'reader.in.bas'
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REM $INCLUDE: 'printer.in.bas'
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REM $INCLUDE: 'env.in.bas'
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REM $INCLUDE: 'core.in.bas'
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REM $INCLUDE: 'debug.in.bas'
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REM READ(A$) -> R
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MAL_READ:
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GOSUB READ_STR
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RETURN
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REM QUASIQUOTE(A) -> R
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SUB QUASIQUOTE
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GOSUB TYPE_A
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IF T<5 OR T>8 THEN GOTO QQ_UNCHANGED
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IF T=5 OR T=8 THEN GOTO QQ_QUOTE
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IF T=7 THEN GOTO QQ_VECTOR
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IF (Z%(A+1)=0) THEN GOTO QQ_LIST
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R=Z%(A+2)
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IF (Z%(R)AND 31)<>5 THEN GOTO QQ_LIST
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IF S$(Z%(R+1))<>"unquote" THEN GOTO QQ_LIST
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GOTO QQ_UNQUOTE
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QQ_UNCHANGED:
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R=A
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GOSUB INC_REF_R
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GOTO QQ_DONE
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QQ_QUOTE:
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REM ['quote, ast]
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B$="quote":T=5:GOSUB STRING
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B=R:GOSUB LIST2
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AY=B:GOSUB RELEASE
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GOTO QQ_DONE
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QQ_VECTOR:
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REM ['vec, (qq_foldr ast)]
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CALL QQ_FOLDR
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A=R
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B$="vec":T=5:GOSUB STRING:B=R
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GOSUB LIST2
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AY=A:GOSUB RELEASE
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AY=B:GOSUB RELEASE
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GOTO QQ_DONE
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QQ_UNQUOTE:
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REM [ast[1]]
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R=Z%(Z%(A+1)+2)
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GOSUB INC_REF_R
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GOTO QQ_DONE
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QQ_LIST:
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CALL QQ_FOLDR
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QQ_DONE:
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END SUB
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REM Quasiquote right fold (A) -> R.
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REM Used for unquoted lists (GOTO), vectors (GOSUB),
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REM and recursively (GOSUB).
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SUB QQ_FOLDR
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IF A=0 THEN GOTO QQ_EMPTY
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IF Z%(A+1)=0 THEN GOTO QQ_EMPTY
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GOTO QQ_NOTEMPTY
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QQ_EMPTY:
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REM empty list/vector -> empty list
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R=6
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GOSUB INC_REF_R
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GOTO QQ_FOLDR_DONE
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QQ_NOTEMPTY:
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REM Execute QQ_FOLDR recursively with (rest A)
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GOSUB PUSH_A
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A=Z%(A+1):CALL QQ_FOLDR
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GOSUB POP_A
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REM Set A to elt = (first A)
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A=Z%(A+2)
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REM Quasiquote transition function:
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REM A: current element, R: accumulator -> R: new accumulator
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REM check if A is a list starting with splice-unquote
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GOSUB TYPE_A
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IF T<>6 THEN GOTO QQ_DEFAULT
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IF (Z%(A+1)=0) THEN GOTO QQ_DEFAULT
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B=Z%(A+2)
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IF (Z%(B)AND 31)<>5 THEN GOTO QQ_DEFAULT
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IF S$(Z%(B+1))<>"splice-unquote" THEN GOTO QQ_DEFAULT
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REM ('concat, A[1], R)
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B=Z%(Z%(A+1)+2)
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A=R
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B$="concat":T=5:GOSUB STRING:C=R
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GOSUB LIST3
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REM release inner quasiquoted since outer list takes ownership
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AY=A:GOSUB RELEASE
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AY=C:GOSUB RELEASE
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GOTO QQ_FOLDR_DONE
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QQ_DEFAULT:
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REM ('cons, quasiquote(A), R)
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GOSUB PUSH_R
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CALL QUASIQUOTE
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B=R
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B$="cons":T=5:GOSUB STRING:C=R
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GOSUB POP_A
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GOSUB LIST3
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REM release inner quasiquoted since outer list takes ownership
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AY=A:GOSUB RELEASE
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AY=B:GOSUB RELEASE
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AY=C:GOSUB RELEASE
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QQ_FOLDR_DONE:
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END SUB
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REM MACROEXPAND(A, E) -> A:
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SUB MACROEXPAND
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GOSUB PUSH_A
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MACROEXPAND_LOOP:
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REM list?
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GOSUB TYPE_A
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IF T<>6 THEN GOTO MACROEXPAND_DONE
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REM non-empty?
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IF Z%(A+1)=0 THEN GOTO MACROEXPAND_DONE
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B=Z%(A+2)
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REM symbol? in first position
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IF (Z%(B)AND 31)<>5 THEN GOTO MACROEXPAND_DONE
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REM defined in environment?
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K=B:CALL ENV_FIND
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IF R=-1 THEN GOTO MACROEXPAND_DONE
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B=R4
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REM macro?
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IF (Z%(B)AND 31)<>11 THEN GOTO MACROEXPAND_DONE
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F=B:AR=Z%(A+1):CALL APPLY
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A=R
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GOSUB PEEK_Q:AY=Q
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REM if previous A was not the first A into macroexpand (i.e. an
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REM intermediate form) then free it
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IF A<>AY THEN GOSUB PEND_A_LV
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IF ER<>-2 THEN GOTO MACROEXPAND_DONE
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GOTO MACROEXPAND_LOOP
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MACROEXPAND_DONE:
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GOSUB POP_Q: REM pop original A
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END SUB
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REM EVAL_AST(A, E) -> R
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SUB EVAL_AST
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REM push A and E on the stack
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Q=E:GOSUB PUSH_Q
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GOSUB PUSH_A
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IF ER<>-2 THEN GOTO EVAL_AST_RETURN
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GOSUB TYPE_A
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IF T=5 THEN GOTO EVAL_AST_SYMBOL
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IF T>=6 AND T<=8 THEN GOTO EVAL_AST_SEQ
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REM scalar: deref to actual value and inc ref cnt
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R=A
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GOSUB INC_REF_R
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GOTO EVAL_AST_RETURN
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EVAL_AST_SYMBOL:
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K=A:GOTO ENV_GET
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ENV_GET_RETURN:
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GOTO EVAL_AST_RETURN
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EVAL_AST_SEQ:
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REM setup the stack for the loop
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GOSUB MAP_LOOP_START
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EVAL_AST_SEQ_LOOP:
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REM check if we are done evaluating the source sequence
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IF Z%(A+1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE
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REM if we are returning to DO, then skip last element
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REM The EVAL_DO call to EVAL_AST must be call #2 for EVAL_AST to
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REM return early and for TCO to work
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Q=5:GOSUB PEEK_Q_Q
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IF Q=2 AND Z%(Z%(A+1)+1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE
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REM call EVAL for each entry
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GOSUB PUSH_A
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IF T<>8 THEN A=Z%(A+2)
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IF T=8 THEN A=Z%(A+3)
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Q=T:GOSUB PUSH_Q: REM push/save type
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CALL EVAL
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GOSUB POP_Q:T=Q: REM pop/restore type
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GOSUB POP_A
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M=R
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REM if error, release the unattached element
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REM TODO: is R=0 correct?
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IF ER<>-2 THEN AY=R:GOSUB RELEASE:R=0:GOTO EVAL_AST_SEQ_LOOP_DONE
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REM for hash-maps, copy the key (inc ref since we are going to
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REM release it below)
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IF T=8 THEN N=M:M=Z%(A+2):Z%(M)=Z%(M)+32
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REM update the return sequence structure
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REM release N (and M if T=8) since seq takes full ownership
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C=1:GOSUB MAP_LOOP_UPDATE
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REM process the next sequence entry from source list
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A=Z%(A+1)
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GOTO EVAL_AST_SEQ_LOOP
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EVAL_AST_SEQ_LOOP_DONE:
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REM cleanup stack and get return value
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GOSUB MAP_LOOP_DONE
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GOTO EVAL_AST_RETURN
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EVAL_AST_RETURN:
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REM pop A and E off the stack
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GOSUB POP_A
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GOSUB POP_Q:E=Q
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END SUB
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REM EVAL(A, E) -> R
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SUB EVAL
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LV=LV+1: REM track basic return stack level
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REM push A and E on the stack
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Q=E:GOSUB PUSH_Q
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GOSUB PUSH_A
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REM PRINT "EVAL A:"+STR$(A)+",X:"+STR$(X)+",LV:"+STR$(LV)+",FRE:"+STR$(FRE(0))
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EVAL_TCO_RECUR:
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM AZ=A:B=1:GOSUB PR_STR
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REM PRINT "EVAL: "+R$+" [A:"+STR$(A)+", LV:"+STR$(LV)+"]"
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GOSUB LIST_Q
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IF R THEN GOTO APPLY_LIST
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EVAL_NOT_LIST:
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REM ELSE
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CALL EVAL_AST
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GOTO EVAL_RETURN
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APPLY_LIST:
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CALL MACROEXPAND
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GOSUB LIST_Q
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IF R<>1 THEN GOTO EVAL_NOT_LIST
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GOSUB EMPTY_Q
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IF R THEN R=A:GOSUB INC_REF_R:GOTO EVAL_RETURN
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A0=Z%(A+2)
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REM get symbol in A$
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IF (Z%(A0)AND 31)<>5 THEN A$=""
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IF (Z%(A0)AND 31)=5 THEN A$=S$(Z%(A0+1))
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IF A$="def!" THEN GOTO EVAL_DEF
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IF A$="let*" THEN GOTO EVAL_LET
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IF A$="quote" THEN GOTO EVAL_QUOTE
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IF A$="quasiquoteexpand" THEN GOTO EVAL_QUASIQUOTEEXPAND
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IF A$="quasiquote" THEN GOTO EVAL_QUASIQUOTE
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IF A$="defmacro!" THEN GOTO EVAL_DEFMACRO
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IF A$="macroexpand" THEN GOTO EVAL_MACROEXPAND
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IF A$="do" THEN GOTO EVAL_DO
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IF A$="if" THEN GOTO EVAL_IF
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IF A$="fn*" THEN GOTO EVAL_FN
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GOTO EVAL_INVOKE
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EVAL_GET_A3:
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A3=Z%(Z%(Z%(Z%(A+1)+1)+1)+2)
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EVAL_GET_A2:
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A2=Z%(Z%(Z%(A+1)+1)+2)
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EVAL_GET_A1:
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A1=Z%(Z%(A+1)+2)
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RETURN
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EVAL_DEF:
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REM PRINT "def!"
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GOSUB EVAL_GET_A2: REM set A1 and A2
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Q=A1:GOSUB PUSH_Q
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A=A2:CALL EVAL: REM eval a2
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GOSUB POP_Q:A1=Q
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM set a1 in env to a2
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K=A1:C=R:GOSUB ENV_SET
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GOTO EVAL_RETURN
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EVAL_LET:
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REM PRINT "let*"
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GOSUB EVAL_GET_A2: REM set A1 and A2
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Q=A2:GOSUB PUSH_Q: REM push/save A2
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Q=E:GOSUB PUSH_Q: REM push env for for later release
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REM create new environment with outer as current environment
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C=E:GOSUB ENV_NEW
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E=R
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EVAL_LET_LOOP:
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IF Z%(A1+1)=0 THEN GOTO EVAL_LET_LOOP_DONE
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Q=A1:GOSUB PUSH_Q: REM push A1
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REM eval current A1 odd element
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A=Z%(Z%(A1+1)+2):CALL EVAL
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GOSUB POP_Q:A1=Q: REM pop A1
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IF ER<>-2 THEN GOTO EVAL_LET_LOOP_DONE
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REM set key/value in the environment
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K=Z%(A1+2):C=R:GOSUB ENV_SET
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AY=R:GOSUB RELEASE: REM release our use, ENV_SET took ownership
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REM skip to the next pair of A1 elements
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A1=Z%(Z%(A1+1)+1)
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GOTO EVAL_LET_LOOP
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EVAL_LET_LOOP_DONE:
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GOSUB POP_Q:AY=Q: REM pop previous env
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REM release previous environment if not the current EVAL env
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GOSUB PEEK_Q_2
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IF AY<>Q THEN GOSUB RELEASE
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GOSUB POP_Q:A2=Q: REM pop A2
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A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_DO:
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A=Z%(A+1): REM rest
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GOSUB PUSH_A: REM push/save A
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REM this must be EVAL_AST call #2 for EVAL_AST to return early
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REM and for TCO to work
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CALL EVAL_AST
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REM cleanup
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AY=R: REM get eval'd list for release
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GOSUB POP_A: REM pop/restore original A for LAST
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GOSUB LAST: REM get last element for return
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A=R: REM new recur AST
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REM cleanup
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GOSUB RELEASE: REM release eval'd list
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AY=A:GOSUB RELEASE: REM release LAST value (not sure why)
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GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_QUOTE:
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R=Z%(Z%(A+1)+2)
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GOSUB INC_REF_R
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GOTO EVAL_RETURN
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EVAL_QUASIQUOTEEXPAND:
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R=Z%(Z%(A+1)+2)
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A=R:CALL QUASIQUOTE
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GOTO EVAL_RETURN
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EVAL_QUASIQUOTE:
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R=Z%(Z%(A+1)+2)
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A=R:CALL QUASIQUOTE
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A=R
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REM add quasiquote result to pending release queue to free when
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REM next lower EVAL level returns (LV)
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GOSUB PEND_A_LV
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GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_DEFMACRO:
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REM PRINT "defmacro!"
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GOSUB EVAL_GET_A2: REM set A1 and A2
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Q=A1:GOSUB PUSH_Q: REM push A1
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A=A2:CALL EVAL: REM eval A2
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GOSUB POP_Q:A1=Q: REM pop A1
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REM change function to macro
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Z%(R)=Z%(R)+1
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REM set A1 in env to A2
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K=A1:C=R:GOSUB ENV_SET
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GOTO EVAL_RETURN
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EVAL_MACROEXPAND:
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REM PRINT "macroexpand"
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R=Z%(Z%(A+1)+2)
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A=R:CALL MACROEXPAND
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R=A
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REM since we are returning it unevaluated, inc the ref cnt
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GOSUB INC_REF_R
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GOTO EVAL_RETURN
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EVAL_IF:
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GOSUB EVAL_GET_A1: REM set A1
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GOSUB PUSH_A: REM push/save A
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A=A1:CALL EVAL
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GOSUB POP_A: REM pop/restore A
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IF (R=0) OR (R=2) THEN GOTO EVAL_IF_FALSE
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EVAL_IF_TRUE:
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AY=R:GOSUB RELEASE
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GOSUB EVAL_GET_A2: REM set A1 and A2 after EVAL
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A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_IF_FALSE:
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AY=R:GOSUB RELEASE
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REM if no false case (A3), return nil
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GOSUB COUNT
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IF R<4 THEN R=0:GOSUB INC_REF_R:GOTO EVAL_RETURN
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GOSUB EVAL_GET_A3: REM set A1 - A3 after EVAL
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A=A3:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_FN:
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GOSUB EVAL_GET_A2: REM set A1 and A2
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T=10:L=A2:M=A1:N=E:GOSUB ALLOC: REM mal function
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GOTO EVAL_RETURN
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EVAL_INVOKE:
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CALL EVAL_AST
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REM if error, return f/args for release by caller
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM push f/args for release after call
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GOSUB PUSH_R
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AR=Z%(R+1): REM rest
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F=Z%(R+2)
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REM if metadata, get the actual object
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GOSUB TYPE_F
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IF T=14 THEN F=Z%(F+1):GOSUB TYPE_F
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ON T-8 GOTO EVAL_DO_FUNCTION,EVAL_DO_MAL_FUNCTION,EVAL_DO_MAL_FUNCTION
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REM if error, pop and return f/args for release by caller
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GOSUB POP_R
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ER=-1:E$="apply of non-function":GOTO EVAL_RETURN
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EVAL_DO_FUNCTION:
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REM regular function
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IF Z%(F+1)<65 THEN GOSUB DO_FUNCTION:GOTO EVAL_DO_FUNCTION_SKIP
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REM for recur functions (apply, map, swap!), use GOTO
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IF Z%(F+1)>64 THEN CALL DO_TCO_FUNCTION
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EVAL_DO_FUNCTION_SKIP:
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REM pop and release f/args
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GOSUB POP_Q:AY=Q
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GOSUB RELEASE
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GOTO EVAL_RETURN
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EVAL_DO_MAL_FUNCTION:
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Q=E:GOSUB PUSH_Q: REM save the current environment for release
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REM create new environ using env and params stored in function
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C=Z%(F+3):A=Z%(F+2):B=AR:GOSUB ENV_NEW_BINDS
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REM release previous env if it is not the top one on the
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REM stack (X%(X-2)) because our new env refers to it and
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REM we no longer need to track it (since we are TCO recurring)
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GOSUB POP_Q:AY=Q
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GOSUB PEEK_Q_2
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IF AY<>Q THEN GOSUB RELEASE
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REM claim the AST before releasing the list containing it
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A=Z%(F+1):Z%(A)=Z%(A)+32
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REM add AST to pending release queue to free as soon as EVAL
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REM actually returns (LV+1)
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LV=LV+1:GOSUB PEND_A_LV:LV=LV-1
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REM pop and release f/args
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GOSUB POP_Q:AY=Q
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GOSUB RELEASE
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REM A set above
|
|
E=R:GOTO EVAL_TCO_RECUR: REM TCO loop
|
|
|
|
EVAL_RETURN:
|
|
REM AZ=R: B=1: GOSUB PR_STR
|
|
REM PRINT "EVAL_RETURN R: ["+R$+"] ("+STR$(R)+"), LV:"+STR$(LV)+",ER:"+STR$(ER)
|
|
|
|
REM release environment if not the top one on the stack
|
|
GOSUB PEEK_Q_1
|
|
IF E<>Q THEN AY=E:GOSUB RELEASE
|
|
|
|
LV=LV-1: REM track basic return stack level
|
|
|
|
REM release everything we couldn't release earlier
|
|
GOSUB RELEASE_PEND
|
|
|
|
REM trigger GC
|
|
#cbm T=FRE(0)
|
|
#qbasic T=0
|
|
|
|
REM pop A and E off the stack
|
|
GOSUB POP_A
|
|
GOSUB POP_Q:E=Q
|
|
|
|
END SUB
|
|
|
|
REM PRINT(A) -> R$
|
|
MAL_PRINT:
|
|
AZ=A:B=1:GOSUB PR_STR
|
|
RETURN
|
|
|
|
REM RE(A$) -> R
|
|
REM Assume D has repl_env
|
|
REM caller must release result
|
|
RE:
|
|
R1=-1
|
|
GOSUB MAL_READ
|
|
R1=R
|
|
IF ER<>-2 THEN GOTO RE_DONE
|
|
|
|
A=R:E=D:CALL EVAL
|
|
|
|
RE_DONE:
|
|
REM Release memory from MAL_READ
|
|
AY=R1:GOSUB RELEASE
|
|
RETURN: REM caller must release result of EVAL
|
|
|
|
REM REP(A$) -> R$
|
|
REM Assume D has repl_env
|
|
SUB REP
|
|
R2=-1
|
|
|
|
GOSUB RE
|
|
R2=R
|
|
IF ER<>-2 THEN GOTO REP_DONE
|
|
|
|
A=R:GOSUB MAL_PRINT
|
|
|
|
REP_DONE:
|
|
REM Release memory from MAL_READ and EVAL
|
|
AY=R2:GOSUB RELEASE
|
|
END SUB
|
|
|
|
REM MAIN program
|
|
MAIN:
|
|
GOSUB INIT_MEMORY
|
|
|
|
LV=0
|
|
|
|
REM create repl_env
|
|
C=0:GOSUB ENV_NEW:D=R
|
|
|
|
REM core.EXT: defined in Basic
|
|
E=D:GOSUB INIT_CORE_NS: REM set core functions in repl_env
|
|
|
|
ZT=ZI: REM top of memory after base repl_env
|
|
|
|
REM core.mal: defined using the language itself
|
|
A$="(def! not (fn* (a) (if a false true)))"
|
|
GOSUB RE:AY=R:GOSUB RELEASE
|
|
|
|
A$="(def! load-file (fn* (f) (do (eval (read-file f)) nil)))"
|
|
GOSUB RE:AY=R:GOSUB RELEASE
|
|
|
|
A$="(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs)"
|
|
A$=A$+" (if (> (count xs) 1) (nth xs 1) (throw "+CHR$(34)+"odd number of"
|
|
A$=A$+" forms to cond"+CHR$(34)+")) (cons 'cond (rest (rest xs)))))))"
|
|
GOSUB RE:AY=R:GOSUB RELEASE
|
|
|
|
REM load the args file
|
|
A$="(load-file "+CHR$(34)+".args.mal"+CHR$(34)+")"
|
|
GOSUB RE:AY=R:GOSUB RELEASE
|
|
|
|
IF ER>-2 THEN GOSUB PRINT_ERROR:END
|
|
|
|
REM set the argument list
|
|
A$="(def! *ARGV* (rest -*ARGS*-))"
|
|
GOSUB RE:AY=R:GOSUB RELEASE
|
|
|
|
REM get the first argument
|
|
A$="(first -*ARGS*-)"
|
|
GOSUB RE
|
|
|
|
REM no arguments, start REPL loop
|
|
IF R<16 THEN GOTO REPL_LOOP
|
|
|
|
REM if there is an argument, then run it as a program
|
|
|
|
RUN_PROG:
|
|
REM free up first arg because we get it again
|
|
AY=R:GOSUB RELEASE
|
|
REM run a single mal program and exit
|
|
A$="(load-file (first -*ARGS*-))"
|
|
GOSUB RE
|
|
IF ER<>-2 THEN GOSUB PRINT_ERROR
|
|
GOTO QUIT
|
|
|
|
REPL_LOOP:
|
|
A$="user> ":GOSUB READLINE: REM call input parser
|
|
IF EZ=1 THEN GOTO QUIT
|
|
IF R$="" THEN GOTO REPL_LOOP
|
|
|
|
A$=R$:CALL REP: REM call REP
|
|
|
|
IF ER<>-2 THEN GOSUB PRINT_ERROR:GOTO REPL_LOOP
|
|
PRINT R$
|
|
GOTO REPL_LOOP
|
|
|
|
QUIT:
|
|
REM GOSUB PR_MEMORY_SUMMARY_SMALL
|
|
#cbm END
|
|
#qbasic SYSTEM
|
|
|
|
PRINT_ERROR:
|
|
PRINT "Error: "+E$
|
|
ER=-2:E$=""
|
|
RETURN
|
|
|