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149 lines
5.6 KiB
Racket
149 lines
5.6 KiB
Racket
#lang racket/base
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(require br-parser-tools/lex
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racket/string
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racket/struct
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(prefix-in : br-parser-tools/lex-sre)
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(for-syntax racket/base))
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(provide (all-from-out br-parser-tools/lex)
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(all-from-out br-parser-tools/lex-sre)
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[struct-out token-struct]
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token
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[struct-out exn:fail:parsing])
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(define (token-print token port mode)
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(write-string (format "~a"
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(cons 'token-struct
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(map (λ(proc) (format "~v" (proc token)))
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(list
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token-struct-type
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token-struct-val
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token-struct-line
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token-struct-column
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token-struct-offset
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token-struct-span
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token-struct-skip?)))) port))
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(struct token-struct (type val offset line column span skip?)
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#:auto-value #f
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#:transparent)
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;; Token constructor.
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;; This is intended to be a general token structure constructor that's nice
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;; to work with.
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;; It should cooperate with the tokenizers constructed with make-permissive-tokenizer.
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(define (token type ;; (U symbol string)
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[val #f] ;; any
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[srcloc #f]
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#:position [position #f] ;; (U #f number)
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#:line [line #f] ;; (U #f number)
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#:column [column #f] ;; (U #f number)
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#:span [span #f] ;; boolean
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#:skip? [skip? #f])
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(token-struct (if (string? type) (string->symbol type) type)
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val
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;; keyword values take precedence over srcloc values
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(or position (and srcloc (srcloc-position srcloc)))
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(or line (and srcloc (srcloc-line srcloc)))
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(or column (and srcloc (srcloc-column srcloc)))
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(or span (and srcloc (srcloc-span srcloc)))
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skip?))
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;; When bad things happen, we need to emit errors with source location.
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(struct exn:fail:parsing exn:fail (srclocs)
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#:transparent
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#:property prop:exn:srclocs (lambda (instance)
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(exn:fail:parsing-srclocs instance)))
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(define (open-input-string-with-locs str)
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(parameterize ([port-count-lines-enabled #t])
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(open-input-string str)))
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(provide (rename-out [apply-port-proc apply-lexer])
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apply-port-proc)
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(define (apply-port-proc proc [val (current-input-port)])
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(for/list ([t (in-port proc (if (string? val) (open-input-string-with-locs val) val))])
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t))
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(provide apply-tokenizer-maker
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(rename-out [apply-tokenizer-maker apply-tokenizer]))
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(define (apply-tokenizer-maker tokenize [in (current-input-port)])
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(define input-port (if (string? in)
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(open-input-string-with-locs in)
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in))
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(define token-producer (tokenize input-port))
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(for/list ([token (in-producer token-producer (λ(tok)
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(define val (cond
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;; position-tokens are produced by lexer-src-pos,
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[(position-token? tok)
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(position-token-token tok)]
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;; and srcloc-tokens by lexer-srcloc
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[(srcloc-token? tok)
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(srcloc-token-token tok)]
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[else tok]))
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(or (eof-object? val) (void? val))))])
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token))
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(provide apply-colorer)
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(define (apply-colorer colorer port-or-string)
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(define p (if (string? port-or-string)
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(open-input-string port-or-string)
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port-or-string))
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(let loop ([acc null])
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(define-values (lex cat shape start end) (colorer p))
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(if (or (eq? 'eof cat) (eof-object? lex))
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(reverse acc)
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(loop (cons (list lex cat shape start end) acc)))))
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(provide trim-ends)
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(define (trim-ends left lexeme right)
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(string-trim (string-trim lexeme left #:right? #f) right #:left? #f))
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(provide from/to)
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(define-lex-trans from/to
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(λ(stx)
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(syntax-case stx ()
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[(_ OPEN CLOSE)
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#'(:seq (from/stop-before OPEN CLOSE) CLOSE)])))
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(provide from/stop-before)
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(define-lex-trans from/stop-before
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(λ(stx)
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(syntax-case stx ()
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[(_ OPEN CLOSE)
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;; (:seq any-string CLOSE any-string) pattern makes it non-greedy
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#'(:seq OPEN (complement (:seq any-string CLOSE any-string)))])))
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(provide uc+lc)
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(define-lex-trans uc+lc
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(λ(stx)
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(syntax-case stx ()
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[(_ . STRS)
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(with-syntax ([(UCSTR ...) (map (compose1 string-upcase syntax->datum) (syntax->list #'STRS))]
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[(LCSTR ...) (map (compose1 string-downcase syntax->datum) (syntax->list #'STRS))])
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#'(union (union UCSTR ...) (union LCSTR ...)))])))
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;; change names of lexer abbreviations to be consistent with Racket srcloc conventions
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(define-syntax-rule (dprt ID-IN ID-OUT)
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(begin
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(provide ID-IN)
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(define-syntax ID-IN (make-rename-transformer (syntax ID-OUT)))))
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(dprt lexeme-start start-pos)
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(dprt lexeme-end end-pos)
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(dprt line position-line)
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(dprt col position-col)
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(dprt pos position-offset)
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(provide span)
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(define (span lexeme-start lexeme-end)
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(abs ; thus same result in reverse order
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(- (pos lexeme-end)
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(pos lexeme-start)))) |