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original commit: 4742164533aa0afffb9c292179af3c20cd68c170
tokens
Scott Owens 23 years ago
parent 31dfbc14ab
commit 76500d4a1b
1 changed files with 5 additions and 5 deletions
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10
collects/parser-tools/yacc.ss
Unescape Escape View File

@ -214,7 +214,7 @@
(fix-error (fix-error
(lambda (stack tok ip get-token) (lambda (stack tok ip get-token)
(printf "stack: ~a~n" stack) ;;(printf "stack: ~a~n" stack)
(letrec ((remove-input (letrec ((remove-input
(lambda () (lambda ()
(if (memq (token-name tok) ends) (if (memq (token-name tok) ends)
@ -223,7 +223,7 @@
(let ((a (find-action stack tok ip))) (let ((a (find-action stack tok ip)))
(cond (cond
((shift? a) ((shift? a)
(printf "shift:~a~n" (shift-state a)) ;;(printf "shift:~a~n" (shift-state a))
(cons (if src-pos (cons (if src-pos
(make-stack-frame (shift-state a) (make-stack-frame (shift-state a)
(token-value tok) (token-value tok)
@ -235,7 +235,7 @@
#f)) #f))
stack)) stack))
(else (else
(printf "discard input:~a~n" tok) ;;(printf "discard input:~a~n" tok)
(set! ip (get-token)) (set! ip (get-token))
(set! tok (input->token ip)) (set! tok (input->token ip))
(remove-input))))))) (remove-input)))))))
@ -244,7 +244,7 @@
(let ((a (find-action stack (make-token 'error #f) ip))) (let ((a (find-action stack (make-token 'error #f) ip)))
(cond (cond
((shift? a) ((shift? a)
(printf "shift:~a~n" (shift-state a)) ;;(printf "shift:~a~n" (shift-state a))
(set! stack (set! stack
(cons (cons
(if src-pos (if src-pos
@ -259,7 +259,7 @@
stack)) stack))
(remove-input)) (remove-input))
(else (else
(printf "discard state:~a~n" (car stack)) ;;(printf "discard state:~a~n" (car stack))
(cond (cond
((< (length stack) 2) ((< (length stack) 2)
(raise-read-error "parser: Cannot continue after error" (raise-read-error "parser: Cannot continue after error"

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