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#lang scheme/base
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; PARSEQ.PLT
;; A Parser Combinator library.
;;
;; Bonzai Lab, LLC. All rights reserved.
;;
;; Licensed under LGPL.
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; primitive.ss - holds the primitive parsers...
;; yc 12/31/2009 - first version
;; yc 1/5/2010 - added literal & literal-ci
;; yc 1/18/2010 - move make-reader to reader.ss
(require "depend.ss"
"util.ss"
"input.ss"
scheme/contract
)
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; primitive parsers
;; return
(define (return v (size 0))
(lambda (in)
(values v
(new-input in size))))
;; struct failed - represents failed parse...
(define-struct failed (pos) #:prefab)
;; succeeded?
(define (succeeded? v) (not (failed? v)))
;; fail - the parser that returns failed with the current port position.
(define (fail in)
(values (make-failed (input-pos in))
in))
;; SOF (start-of-file)
;; returns true only when the input-pos = 0
(define (SOF in)
((if (= (input-pos in) 0)
(return 'sof)
fail) in))
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; item-based primitive parsers
;; item
;; the fundamental building block
(define (item peek isa? satisfy? size)
(lambda (in)
(let ((v (peek in)))
((if (and (isa? v) (satisfy? v))
(return v (size v))
fail) in))))
;; bytes=
;; parses if the next part of the input matches the exact bytes
(define (bytes= bytes)
(let ((size (bytes-length bytes)))
(item (peek-bytes* size)
bytes?
(lambda (b)
(bytes=? b bytes))
(the-number size))))
;; string=
;; parses if the next part of the input matches the exact string
(define (string= s (comp? string=?))
(let ((size (string-bytes/utf-8-length s)))
(item (peek-string* size)
string?
(lambda (str)
(comp? str s))
(the-number size))))
(define (string-ci= s)
(string= s string-ci=?))
;; byte-when
;; return the next byte when satisfy matches
(define (byte-when satisfy? (isa? byte?) (size (the-number 1)))
(item peek-byte* isa? satisfy? size))
;; any-byte
;; return the next byte
(define any-byte (byte-when identity))
;; byte=
(define (byte= b) (byte-when (lambda (v)
(= b v))))
;; EOF
;; return if the next byte is eof
(define EOF (byte-when identity eof-object? (the-number 0)))
;; bits=
;; matches a byte @ the bits level... (pass in the individual bits)
(define (bits= bits)
(byte-when (lambda (b) (= b (bits->byte bits)))))
;; byte-in
(define (byte-in bytes)
(byte-when (lambda (b) (member b bytes))))
(define (byte-not-in bytes)
(byte-when (lambda (b) (not (member b bytes)))))
(define (byte-between lb hb)
(byte-when (lambda (b) (<= lb b hb))))
(define (byte-not-between lb hb)
(byte-when (compose not (lambda (b) (<= lb b hb)))))
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; character-based parsers
;; char-when
;; the fundamental character-based parser
(define (char-when satisfy?)
(item peek-char* char? satisfy? char-utf-8-length))
;; any-char
;; return the next character
(define any-char (char-when identity))
;; char=
;; return the next character if it equals c
(define (char= c (comp? char=?) (trans identity))
(char-when (lambda (v) (trans (comp? c v)))))
;; char-ci=
(define (char-ci= c) (char= c char-ci=?))
;; char-not
;; return the next character if it is not c
(define (char-not= c (comp? char=?)) (char= c comp? not))
;; char-ci-not
(define (char-ci-not= c) (char-not= char-ci=?))
;; char-between
;; return the next character if it falls in between lc & hc
(define (char-between lc hc (comp? char<=?) (trans identity))
(char-when (lambda (v) (trans (comp? lc v hc)))))
;; char-ci-between
(define (char-ci-between lc hc) (char-between lc hc char-ci<=?))
(define (char-not-between lc hc (comp? char<=?))
(char-between lc hc comp? not))
;; char-ci-not-between
(define (char-ci-not-between lc hc) (char-not-between lc hc char-ci<=?))
;; char-in
;; return the next character if it one of the chars
(define (char-in chars (comp? char=?) (trans identity))
(char-when (lambda (v)
(trans (memf (lambda (c)
(comp? c v))
chars)))))
;; char-ci-in
(define (char-ci-in chars) (char-in chars char-ci=?))
;; char-not-in
;; return the next character if it is not one of the characters
(define (char-not-in chars (comp? char=?)) (char-in chars comp? not))
;; char-ci-not-in
(define (char-ci-not-in chars) (char-not-in chars char-ci=?))
;; literal
;; returns a parser based on the passed in literal
(define (literal p)
(cond ((char? p) (char= p))
((byte? p) (byte= p))
((string? p) (string= p))
((bytes? p) (bytes= p))
(else p)))
;; literal-ci
;; a ci version of literal
(define (literal-ci p)
(cond ((char? p) (char-ci= p))
((string? p) (string-ci= p))
(else (literal p))))
(define Literal/c (or/c string? bytes? char? byte?))
(define Literal-Parser/c (or/c Literal/c Parser/c))
(provide return
(struct-out failed)
succeeded?
fail
SOF
item
bytes=
string=
string-ci=
byte-when
any-byte
byte=
EOF
bits=
byte-in
byte-not-in
byte-between
byte-not-between
char-when
any-char
char=
char-ci=
char-not=
char-ci-not=
char-between
char-ci-between
char-not-between
char-ci-not-between
char-in
char-ci-in
char-not-in
char-ci-not-in
literal
literal-ci
Literal/c
Literal-Parser/c
)
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