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@ -3,227 +3,140 @@
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;; Provides the syntax used to create lexers and the functions needed to
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;; create and use the buffer that the lexer reads from. See doc.txt.
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(require-for-syntax (lib "list.ss")
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(lib "stx.ss" "syntax")
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(lib "define.ss" "syntax")
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(lib "boundmap.ss" "syntax")
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"private-lex/util.ss"
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(require-for-syntax "private-lex/util.ss"
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"private-lex/actions.ss"
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"private-lex/front.ss"
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"private-lex/unicode-chars.ss")
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"private-lex/front.ss")
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(require (lib "stxparam.ss")
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(lib "readerr.ss" "syntax")
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(require (lib "readerr.ss" "syntax")
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(lib "cffi.ss" "compiler")
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"private-lex/token.ss")
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(provide lexer lexer-src-pos define-lex-abbrev define-lex-abbrevs define-lex-trans
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;; Dealing with tokens and related structures
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define-tokens define-empty-tokens token-name token-value token?
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(struct position (offset line col))
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(struct position-token (token start-pos end-pos))
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;; File path for highlighting errors while lexing
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file-path
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;; Lex abbrevs for unicode char sets. See mzscheme manual section 3.4.
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any-char any-string nothing alphabetic lower-case upper-case title-case
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numeric symbolic punctuation graphic whitespace blank iso-control
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;; A regular expression operator
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char-set)
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(provide lexer lexer-src-pos define-lex-abbrev define-lex-abbrevs
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get-position position-offset position-line position-col position?
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define-tokens define-empty-tokens token-name token-value token? file-path)
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;; wrap-action: syntax-object src-pos? -> syntax-object
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(define-for-syntax (wrap-action action src-pos?)
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(with-syntax ((action-stx
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(if src-pos?
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#`(let/ec ret
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(syntax-parameterize
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((return-without-pos (make-rename-transformer #'ret)))
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(make-position-token #,action start-pos end-pos)))
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action)))
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(syntax/loc action
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(lambda (start-pos-p end-pos-p lexeme-p input-port-p)
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(syntax-parameterize
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((start-pos (make-rename-transformer #'start-pos-p))
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(end-pos (make-rename-transformer #'end-pos-p))
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(lexeme (make-rename-transformer #'lexeme-p))
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(input-port (make-rename-transformer #'input-port-p)))
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action-stx)))))
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(define-for-syntax (make-lexer-trans src-pos?)
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(lambda (stx)
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(syntax-case stx ()
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((_)
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(raise-syntax-error #f "accepts the empty string" stx))
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((_ re-act ...)
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(begin
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(for-each
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(lambda (x)
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(syntax-case x ()
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((re act) (void))
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(_ (raise-syntax-error #f
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"not a regular expression / action pair"
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stx
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x))))
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(syntax->list (syntax (re-act ...))))
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(let* ((spec/re-act-lst
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(syntax->list (syntax (re-act ...))))
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(eof-act
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(get-special-action spec/re-act-lst #'eof #''eof))
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(spec-act
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(get-special-action spec/re-act-lst #'special #'(void)))
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(spec-error-act
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(get-special-action spec/re-act-lst #'special-error #'(raise lexeme)))
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(spec-comment-act
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(get-special-action spec/re-act-lst #'special-comment #'#f))
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(ids (list #'special #'special-comment #'special-error #'eof))
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(re-act-lst
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(filter
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(lambda (spec/re-act)
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(syntax-case spec/re-act ()
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(((special) act)
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(not (ormap
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(lambda (x)
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(module-or-top-identifier=? (syntax special) x))
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ids)))
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(_ #t)))
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spec/re-act-lst))
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(name-lst (map (lambda (x) (datum->syntax-object #f (gensym))) re-act-lst))
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(act-lst (map (lambda (x) (stx-car (stx-cdr x))) re-act-lst))
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(re-actname-lst (map (lambda (re-act name)
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(list (stx-car re-act)
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name))
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re-act-lst
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name-lst)))
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(let-values (((trans start action-names no-look disappeared-uses)
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(build-lexer re-actname-lst)))
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#;(when (vector-ref action-names start)
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(raise-syntax-error #f "accepts the empty string" stx))
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(with-syntax ((start-state-stx start)
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(trans-table-stx trans)
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(no-lookahead-stx no-look)
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((name ...) name-lst)
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((act ...) (map (lambda (a)
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(wrap-action a src-pos?))
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act-lst))
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((act-name ...) (vector->list action-names))
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(spec-act-stx
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(wrap-action spec-act src-pos?))
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(spec-error-act-stx
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(wrap-action spec-error-act src-pos?))
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(has-comment-act?-stx
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(if (syntax-e spec-comment-act) #t #f))
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(spec-comment-act-stx
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(wrap-action spec-comment-act src-pos?))
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(eof-act-stx (wrap-action eof-act src-pos?)))
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(syntax-property
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(syntax/loc stx
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(let ([name act] ...)
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(lexer-body start-state-stx
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trans-table-stx
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(vector act-name ...)
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no-lookahead-stx
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spec-act-stx
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spec-error-act-stx
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has-comment-act?-stx
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spec-comment-act-stx
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eof-act-stx)))
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'disappeared-use
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disappeared-uses)))))))))
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(define-syntax lexer (make-lexer-trans #f))
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(define-syntax lexer-src-pos (make-lexer-trans #t))
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(define file-path (make-parameter #f))
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(define-syntaxes (lexer lexer-src-pos)
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(let ((build-lexer
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(lambda (wrap?)
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(lambda (stx)
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(syntax-case stx ()
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((_)
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(raise-syntax-error #f "empty lexer is not allowed" stx))
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((_ re-act ...)
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(begin
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(for-each
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(lambda (x)
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(syntax-case x ()
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((re act) (void))
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(_ (raise-syntax-error 'lexer
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"expects regular expression / action pairs"
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x))))
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(syntax->list (syntax (re-act ...))))
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(let* ((spec/re-act-lst
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(syntax->list (syntax (re-act ...))))
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(eof-act
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(get-special-action spec/re-act-lst 'eof #''eof))
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(spec-act
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(get-special-action spec/re-act-lst 'special #'(void)))
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(spec-error-act
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(get-special-action spec/re-act-lst 'special-error #'(raise exception)))
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(spec-comment-act
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(get-special-action spec/re-act-lst 'special-comment #'#f))
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(re-act-lst
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(filter-out-specials spec/re-act-lst
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'(special special-comment special-error eof))))
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(let-values (((trans start actions no-look)
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(build-lexer re-act-lst)))
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(with-syntax ((start-state-stx start)
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(trans-table-stx trans)
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(no-lookahead-stx no-look)
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(actions-stx `(vector ,@(map (lambda (a)
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(if a (wrap-action a 'lexeme #'here a) #f))
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(vector->list actions))))
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(spec-act-stx
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(wrap-action spec-act 'special #'here spec-act))
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(spec-error-act-stx
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(wrap-action spec-error-act 'exception #'here spec-error-act))
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(has-comment-act?-stx (if (syntax-e spec-comment-act) #t #f))
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(spec-comment-act-stx
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(wrap-action spec-comment-act (gensym) #'here spec-comment-act))
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(eof-act-stx
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(wrap-action eof-act 'lexeme #'here eof-act))
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(wrap? wrap?))
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(syntax
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(lexer-body start-state-stx
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trans-table-stx
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actions-stx
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no-lookahead-stx
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spec-act-stx
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spec-error-act-stx
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has-comment-act?-stx
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spec-comment-act-stx
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eof-act-stx
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wrap?))))))))))))
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(values
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(build-lexer #f)
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(build-lexer #t))))
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(define-syntax (define-lex-abbrev stx)
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(syntax-case stx ()
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((_ name re)
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(identifier? (syntax name))
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(syntax/loc stx
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(syntax
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(define-syntax name
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(make-lex-abbrev (quote-syntax re)))))
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(_
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(raise-syntax-error
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#f
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"form should be (define-lex-abbrev name re)"
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"Form should be (define-lex-abbrev name re)"
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stx))))
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(define-syntax (define-lex-abbrevs stx)
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(syntax-case stx ()
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((_ x ...)
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(with-syntax (((abbrev ...)
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(map
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(lambda (a)
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(syntax-case a ()
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((name re)
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(identifier? (syntax name))
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(syntax/loc a (define-lex-abbrev name re)))
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(_ (raise-syntax-error
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#f
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"form should be (define-lex-abbrevs (name re) ...)"
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stx
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a))))
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(syntax->list (syntax (x ...))))))
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(syntax/loc stx (begin abbrev ...))))
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(_
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(raise-syntax-error
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#f
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"form should be (define-lex-abbrevs (name re) ...)"
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stx))))
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(define-syntax (define-lex-trans stx)
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(syntax-case stx ()
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((_ name-form body-form)
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(let-values (((name body)
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(normalize-definition (syntax (define-syntax name-form body-form)) #'lambda)))
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#`(define-syntax #,name
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(let ((certifier (syntax-local-certifier)))
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(make-lex-trans (lambda (stx)
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(certifier (#,body stx) 'a)))))))
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(let* ((abbrev (syntax->list (syntax (x ...))))
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(r (map (lambda (a)
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(syntax-case a ()
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((name re)
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(identifier? (syntax name))
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(syntax (define-lex-abbrev name re)))
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(_ (raise-syntax-error
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'Lexer-abbreviation
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"Form should be (identifier value)"
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a))))
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abbrev)))
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(datum->syntax-object
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#'here
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(cons 'begin r)
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stx)))
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(_
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(raise-syntax-error
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#f
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"form should be (define-lex-trans name transformer)"
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"Form should be (define-lex-abbrevs (name re) ...)"
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stx))))
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(define (get-next-state-helper char min max table)
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(if (>= min max)
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#f
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(let* ((try (quotient (+ min max) 2))
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(el (vector-ref table try))
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(r1 (vector-ref el 0))
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(r2 (vector-ref el 1)))
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(cond
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((and (>= char r1) (<= char r2)) (vector-ref el 2))
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((< char r1) (get-next-state-helper char min try table))
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(else (get-next-state-helper char (add1 try) max table))))))
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(define (get-next-state char table)
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(if table
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(get-next-state-helper char 0 (vector-length table) table)
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#f))
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(define (lexer-body start-state trans-table actions no-lookahead
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special-action special-error-action
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has-special-comment-action? special-comment-action eof-action)
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has-special-comment-action? special-comment-action eof-action wrap?)
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(letrec ((lexer
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(lambda (ip)
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(unless (input-port? ip)
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(raise-type-error
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'lexer
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"input-port"
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0
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ip))
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(let ((first-pos (get-position ip))
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(first-char (peek-char-or-special ip 0)))
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;(printf "(peek-char-or-special port 0) = ~e~n" first-char)
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(cond
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((eof-object? first-char)
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(do-match ip first-pos eof-action (read-char-or-special ip)))
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((not (char? first-char))
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((eq? 'special first-char)
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(let* ((comment? #f)
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(error? #f)
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(spec (with-handlers ((special-comment?
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(spec (with-handlers ((exn:special-comment?
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(lambda (x) (set! comment? #t)))
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(exn:fail?
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(not-break-exn?
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(lambda (ex) (set! error? #t) ex)))
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(read-char-or-special ip))))
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(cond
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@ -234,7 +147,9 @@
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(comment? special-comment-action)
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(error? special-error-action)
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(else special-action))
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spec)))))
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spec wrap?)))))
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((eof-object? first-char)
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(do-match ip first-pos eof-action (read-char-or-special ip) wrap?))
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(else
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(let lexer-loop (
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;; current-state
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@ -245,56 +160,47 @@
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;; including a match at the current state
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(longest-match-action
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(vector-ref actions start-state))
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;; how many bytes preceed char
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(length-bytes 0)
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;; how many characters have been read
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;; including the one just read
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(length-chars 1)
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(length 1)
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;; how many characters are in the longest match
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(longest-match-length 0))
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(let ((next-state
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(cond
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((eof-object? char) #f)
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((not (char? char)) #f)
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(else (get-next-state (char->integer char)
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(vector-ref trans-table state))))))
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((eq? char 'special) #f)
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(else
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(vector-ref
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trans-table
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(+ (char->integer char) (* 256 state)))))))
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(cond
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((not next-state)
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(check-match ip first-pos longest-match-length
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length-chars longest-match-action))
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length longest-match-action wrap?))
|
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((vector-ref no-lookahead next-state)
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(let ((act (vector-ref actions next-state)))
|
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(check-match ip
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first-pos
|
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(if act length-chars longest-match-length)
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length-chars
|
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(if act act longest-match-action))))
|
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(if act length longest-match-length)
|
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length
|
|
|
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(if act act longest-match-action)
|
|
|
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|
wrap?)))
|
|
|
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|
(else
|
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|
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(let* ((act (vector-ref actions next-state))
|
|
|
|
|
(next-length-bytes (+ (char-utf-8-length char) length-bytes))
|
|
|
|
|
(next-char (peek-char-or-special ip next-length-bytes)))
|
|
|
|
|
#;(printf "(peek-char-or-special port ~e) = ~e~n"
|
|
|
|
|
next-length-bytes next-char)
|
|
|
|
|
(let ((act (vector-ref actions next-state)))
|
|
|
|
|
(lexer-loop next-state
|
|
|
|
|
next-char
|
|
|
|
|
(peek-char-or-special ip length)
|
|
|
|
|
(if act
|
|
|
|
|
act
|
|
|
|
|
longest-match-action)
|
|
|
|
|
next-length-bytes
|
|
|
|
|
(add1 length-chars)
|
|
|
|
|
(add1 length)
|
|
|
|
|
(if act
|
|
|
|
|
length-chars
|
|
|
|
|
length
|
|
|
|
|
longest-match-length)))))))))))))
|
|
|
|
|
(lambda (ip)
|
|
|
|
|
(unless (input-port? ip)
|
|
|
|
|
(raise-type-error
|
|
|
|
|
'lexer
|
|
|
|
|
"input-port"
|
|
|
|
|
0
|
|
|
|
|
ip))
|
|
|
|
|
(lexer ip))))
|
|
|
|
|
lexer))
|
|
|
|
|
|
|
|
|
|
(define (check-match lb first-pos longest-match-length length longest-match-action)
|
|
|
|
|
(define id (lambda (x) x))
|
|
|
|
|
|
|
|
|
|
(define (check-match lb first-pos longest-match-length length longest-match-action wrap?)
|
|
|
|
|
(unless longest-match-action
|
|
|
|
|
(let* ((match (read-string length lb))
|
|
|
|
|
(end-pos (get-position lb)))
|
|
|
|
|
@ -306,81 +212,23 @@
|
|
|
|
|
(position-offset first-pos)
|
|
|
|
|
(- (position-offset end-pos) (position-offset first-pos)))))
|
|
|
|
|
(let ((match (read-string longest-match-length lb)))
|
|
|
|
|
;(printf "(read-string ~e port) = ~e~n" longest-match-length match)
|
|
|
|
|
(do-match lb first-pos longest-match-action match)))
|
|
|
|
|
(do-match lb first-pos longest-match-action match wrap?)))
|
|
|
|
|
|
|
|
|
|
(define file-path (make-parameter #f))
|
|
|
|
|
|
|
|
|
|
(define (do-match ip first-pos action value)
|
|
|
|
|
#;(printf "(action ~a ~a ~a ~a)~n"
|
|
|
|
|
(position-offset first-pos) (position-offset (get-position ip)) value ip)
|
|
|
|
|
(action first-pos (get-position ip) value ip))
|
|
|
|
|
|
|
|
|
|
(define (do-match ip first-pos action value wrap?)
|
|
|
|
|
(let ((end-pos (get-position ip)))
|
|
|
|
|
(cond
|
|
|
|
|
(wrap?
|
|
|
|
|
(let/ec ret
|
|
|
|
|
(list (action first-pos end-pos value ret ip)
|
|
|
|
|
first-pos
|
|
|
|
|
end-pos)))
|
|
|
|
|
(else
|
|
|
|
|
(action first-pos end-pos value id ip)))))
|
|
|
|
|
|
|
|
|
|
(define-struct position (offset line col))
|
|
|
|
|
(define (get-position ip)
|
|
|
|
|
(let-values (((line col off) (port-next-location ip)))
|
|
|
|
|
(make-position off line col)))
|
|
|
|
|
|
|
|
|
|
(define-syntax (create-unicode-abbrevs stx)
|
|
|
|
|
(syntax-case stx ()
|
|
|
|
|
((_ ctxt)
|
|
|
|
|
(with-syntax (((ranges ...) (map (lambda (range)
|
|
|
|
|
`(union ,@(map (lambda (x)
|
|
|
|
|
`(char-range ,(integer->char (car x))
|
|
|
|
|
,(integer->char (cdr x))))
|
|
|
|
|
range)))
|
|
|
|
|
(list (force alphabetic-ranges)
|
|
|
|
|
(force lower-case-ranges)
|
|
|
|
|
(force upper-case-ranges)
|
|
|
|
|
(force title-case-ranges)
|
|
|
|
|
(force numeric-ranges)
|
|
|
|
|
(force symbolic-ranges)
|
|
|
|
|
(force punctuation-ranges)
|
|
|
|
|
(force graphic-ranges)
|
|
|
|
|
(force whitespace-ranges)
|
|
|
|
|
(force blank-ranges)
|
|
|
|
|
(force iso-control-ranges))))
|
|
|
|
|
((names ...) (map (lambda (sym)
|
|
|
|
|
(datum->syntax-object (syntax ctxt) sym #f))
|
|
|
|
|
'(alphabetic
|
|
|
|
|
lower-case
|
|
|
|
|
upper-case
|
|
|
|
|
title-case
|
|
|
|
|
numeric
|
|
|
|
|
symbolic
|
|
|
|
|
punctuation
|
|
|
|
|
graphic
|
|
|
|
|
whitespace
|
|
|
|
|
blank
|
|
|
|
|
iso-control))))
|
|
|
|
|
(syntax (define-lex-abbrevs (names ranges) ...))))))
|
|
|
|
|
|
|
|
|
|
(define-lex-abbrev any-char (char-complement (union)))
|
|
|
|
|
(define-lex-abbrev any-string (intersection))
|
|
|
|
|
(define-lex-abbrev nothing (union))
|
|
|
|
|
(create-unicode-abbrevs #'here)
|
|
|
|
|
|
|
|
|
|
(define-lex-trans (char-set stx)
|
|
|
|
|
(syntax-case stx ()
|
|
|
|
|
((_ str)
|
|
|
|
|
(string? (syntax-e (syntax str)))
|
|
|
|
|
(with-syntax (((char ...) (string->list (syntax-e (syntax str)))))
|
|
|
|
|
(syntax (union char ...))))))
|
|
|
|
|
|
|
|
|
|
(define-syntax provide-lex-keyword
|
|
|
|
|
(syntax-rules ()
|
|
|
|
|
[(_ id ...)
|
|
|
|
|
(begin
|
|
|
|
|
(define-syntax-parameter id
|
|
|
|
|
(make-set!-transformer
|
|
|
|
|
(lambda (stx)
|
|
|
|
|
(raise-syntax-error
|
|
|
|
|
#f
|
|
|
|
|
(format "use of a lexer keyword (~a) is not in an appropriate lexer action"
|
|
|
|
|
'id)
|
|
|
|
|
stx))))
|
|
|
|
|
...
|
|
|
|
|
(provide id ...))]))
|
|
|
|
|
|
|
|
|
|
(provide-lex-keyword start-pos end-pos lexeme input-port return-without-pos)
|
|
|
|
|
|
|
|
|
|
)
|
|
|
|
|
|
Eli Barzilay
20 years ago