зеркало из https://github.com/mozilla/gecko-dev.git
639 строки
32 KiB
Common Lisp
639 строки
32 KiB
Common Lisp
;;;
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;;; JavaScript 2.0 regular expression parser
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;;;
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;;; Waldemar Horwat (waldemar@acm.org)
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;;;
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(progn
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(defparameter *rw*
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(generate-world
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"R"
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'((lexer regexp-lexer
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:lr-1
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:regular-expression-pattern
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((:unicode-character (% every (:text "Any Unicode character")) () t)
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(:unicode-alphanumeric
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(% alphanumeric (:text "Any Unicode alphabetic or decimal digit character (includes ASCII "
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(:character-literal #\0) :nbhy (:character-literal #\9) ", "
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(:character-literal #\A) :nbhy (:character-literal #\Z) ", and "
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(:character-literal #\a) :nbhy (:character-literal #\z) ")"))
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() t)
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(:line-terminator (#?000A #?000D #?2028 #?2029) () t)
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(:decimal-digit (#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9)
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(($default-action $default-action)
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(decimal-value $digit-value)))
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(:non-zero-digit (#\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9)
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((decimal-value $digit-value)))
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(:hex-digit (#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\A #\B #\C #\D #\E #\F #\a #\b #\c #\d #\e #\f)
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((hex-value $digit-value)))
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(:control-letter (++ (#\A #\B #\C #\D #\E #\F #\G #\H #\I #\J #\K #\L #\M #\N #\O #\P #\Q #\R #\S #\T #\U #\V #\W #\X #\Y #\Z)
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(#\a #\b #\c #\d #\e #\f #\g #\h #\i #\j #\k #\l #\m #\n #\o #\p #\q #\r #\s #\t #\u #\v #\w #\x #\y #\z))
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(($default-action $default-action)))
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(:pattern-character (- :unicode-character (#\^ #\$ #\\ #\. #\* #\+ #\? #\( #\) #\[ #\] #\{ #\} #\|))
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(($default-action $default-action)))
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((:class-character dash) (- :unicode-character (#\\ #\]))
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(($default-action $default-action)))
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((:class-character no-dash) (- (:class-character dash) (#\-))
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(($default-action $default-action)))
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(:identity-escape (- :unicode-character :unicode-alphanumeric)
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(($default-action $default-action))))
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(($default-action character nil identity)
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($digit-value integer digit-value digit-char-36)))
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(deftype semantic-exception (oneof syntax-error))
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(%section "Unicode Character Classes")
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(%charclass :unicode-character)
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(%charclass :unicode-alphanumeric)
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(%charclass :line-terminator)
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(define line-terminators (set character) (set-of character #?000A #?000D #?2028 #?2029))
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(define re-whitespaces (set character) (set-of character #?000C #?000A #?000D #?0009 #?000B #\space))
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(define re-digits (set character) (set-of-ranges character #\0 #\9))
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(define re-word-characters (set character) (set-of-ranges character #\0 #\9 #\A #\Z #\a #\z #\_ nil))
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(%print-actions)
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(%section "Regular Expression Definitions")
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(deftype r-e-input (tuple (str string) (ignore-case boolean) (multiline boolean)))
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(%text :semantics
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"Field " (:field str r-e-input) " is the input string. "
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(:field ignore-case r-e-input) " and " (:field multiline r-e-input) " are the corresponding regular expression flags.")
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(deftype r-e-result (oneof (success r-e-match) failure))
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(deftype r-e-match (tuple (end-index integer)
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(captures (vector capture))))
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(%text :semantics
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"A " (:type r-e-match) " holds an intermediate state during the pattern-matching process. "
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(:field end-index r-e-match)
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" is the index of the next input character to be matched by the next component in a regular expression pattern. "
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"If we are at the end of the pattern, " (:field end-index r-e-match)
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" is one plus the index of the last matched input character. "
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(:field captures r-e-match)
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" is a zero-based array of the strings captured so far by capturing parentheses.")
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(deftype capture (oneof (present string)
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absent))
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(deftype continuation (-> (r-e-match) r-e-result))
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(%text :semantics
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"A " (:type continuation)
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" is a function that attempts to match the remaining portion of the pattern against the input string, "
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"starting at the intermediate state given by its " (:type r-e-match) " argument. "
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"If a match is possible, it returns a " (:field success r-e-result) " result that contains the final "
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(:type r-e-match) " state; if no match is possible, it returns a " (:field failure r-e-result) " result.")
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(deftype matcher (-> (r-e-input r-e-match continuation) r-e-result))
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(%text :semantics
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"A " (:type matcher)
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" is a function that attempts to match a middle portion of the pattern against the input string, "
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"starting at the intermediate state given by its " (:type r-e-match) " argument. "
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"Since the remainder of the pattern heavily influences whether (and how) a middle portion will match, we "
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"must pass in a " (:type continuation) " function that checks whether the rest of the pattern matched. "
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"If the continuation returns " (:field failure r-e-result) ", the matcher function may call it repeatedly, "
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"trying various alternatives at pattern choice points.")
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(%text :semantics
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"The " (:type r-e-input) " parameter contains the input string and is merely passed down to subroutines.")
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(deftype matcher-generator (-> (integer) matcher))
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(%text :semantics
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"A " (:type matcher-generator)
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" is a function executed at the time the regular expression is compiled that returns a " (:type matcher) " for a part "
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"of the pattern. The " (:type integer) " parameter contains the number of capturing left parentheses seen so far in the "
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"pattern and is used to assign static, consecutive numbers to capturing parentheses.")
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(define (character-set-matcher (acceptance-set (set character)) (invert boolean)) matcher ;*********ignore case?
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(let ((i integer (& end-index x))
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(s string (& str t)))
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(if (= i (length s))
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(oneof failure)
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(if (xor (character-set-member (nth s i) acceptance-set) invert)
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(c (tuple r-e-match (+ i 1) (& captures x)))
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(oneof failure))))))
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(%text :semantics
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(:global character-set-matcher) " returns a " (:type matcher)
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" that matches a single input string character. If "
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(:local invert) " is false, the match succeeds if the character is a member of the "
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(:local acceptance-set) " set of characters (possibly ignoring case). If "
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(:local invert) " is true, the match succeeds if the character is not a member of the "
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(:local acceptance-set) " set of characters (possibly ignoring case).")
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(define (character-matcher (ch character)) matcher
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(character-set-matcher (set-of character ch) false))
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(%text :semantics
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(:global character-matcher) " returns a " (:type matcher)
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" that matches a single input string character. The match succeeds if the character is the same as "
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(:local ch) " (possibly ignoring case).")
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(%print-actions)
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(%section "Regular Expression Patterns")
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(rule :regular-expression-pattern ((exec (-> (r-e-input integer) r-e-result)))
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(production :regular-expression-pattern (:disjunction) regular-expression-pattern-disjunction
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(exec
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(let ((match matcher ((gen-matcher :disjunction) 0)))
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(function ((t r-e-input) (index integer))
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(match
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t
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(tuple r-e-match index (fill-capture (count-parens :disjunction)))
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success-continuation))))))
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(%print-actions)
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(define (success-continuation (x r-e-match)) r-e-result
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(oneof success x))
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(define (fill-capture (i integer)) (vector capture)
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(if (= i 0)
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(vector-of capture)
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(append (fill-capture (- i 1)) (vector (oneof absent)))))
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(%subsection "Disjunctions")
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(rule :disjunction ((gen-matcher matcher-generator) (count-parens integer))
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(production :disjunction (:alternative) disjunction-one
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(gen-matcher (gen-matcher :alternative))
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(count-parens (count-parens :alternative)))
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(production :disjunction (:alternative #\| :disjunction) disjunction-more
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((gen-matcher (paren-index integer))
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(let ((match1 matcher ((gen-matcher :alternative) paren-index))
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(match2 matcher ((gen-matcher :disjunction) (+ paren-index (count-parens :alternative)))))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(case (match1 t x c)
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((success y r-e-match) (oneof success y))
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(failure (match2 t x c))))))
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(count-parens (+ (count-parens :alternative) (count-parens :disjunction)))))
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(%print-actions)
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(%subsection "Alternatives")
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(rule :alternative ((gen-matcher matcher-generator) (count-parens integer))
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(production :alternative () alternative-none
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((gen-matcher (paren-index integer :unused))
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(function ((t r-e-input :unused) (x r-e-match) (c continuation))
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(c x)))
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(count-parens 0))
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(production :alternative (:alternative :term) alternative-some
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((gen-matcher (paren-index integer))
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(let ((match1 matcher ((gen-matcher :alternative) paren-index))
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(match2 matcher ((gen-matcher :term) (+ paren-index (count-parens :alternative)))))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(let ((d continuation (function ((y r-e-match))
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(match2 t y c))))
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(match1 t x d)))))
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(count-parens (+ (count-parens :alternative) (count-parens :term)))))
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(%print-actions)
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(%subsection "Terms")
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(rule :term ((gen-matcher matcher-generator) (count-parens integer))
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(production :term (:assertion) term-assertion
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((gen-matcher (paren-index integer :unused))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(if ((test-assertion :assertion) t x)
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(c x)
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(oneof failure))))
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(count-parens 0))
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(production :term (:atom) term-atom
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(gen-matcher (gen-matcher :atom))
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(count-parens (count-parens :atom)))
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(production :term (:atom :quantifier) term-quantified-atom
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((gen-matcher (paren-index integer))
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(let ((match matcher ((gen-matcher :atom) paren-index))
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(min integer (minimum :quantifier))
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(max limit (maximum :quantifier))
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(greedy boolean (greedy :quantifier)))
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(if (case max
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((finite m integer) (< m min))
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(infinite false))
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(throw (oneof syntax-error))
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(repeat-matcher match min max greedy paren-index (count-parens :atom)))))
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(count-parens (count-parens :atom))))
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(%print-actions)
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(rule :quantifier ((minimum integer) (maximum limit) (greedy boolean))
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(production :quantifier (:quantifier-prefix) quantifier-eager
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(minimum (minimum :quantifier-prefix))
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(maximum (maximum :quantifier-prefix))
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(greedy true))
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(production :quantifier (:quantifier-prefix #\?) quantifier-greedy
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(minimum (minimum :quantifier-prefix))
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(maximum (maximum :quantifier-prefix))
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(greedy false)))
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(rule :quantifier-prefix ((minimum integer) (maximum limit))
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(production :quantifier-prefix (#\*) quantifier-prefix-zero-or-more
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(minimum 0)
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(maximum (oneof infinite)))
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(production :quantifier-prefix (#\+) quantifier-prefix-one-or-more
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(minimum 1)
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(maximum (oneof infinite)))
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(production :quantifier-prefix (#\?) quantifier-prefix-zero-or-one
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(minimum 0)
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(maximum (oneof finite 1)))
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(production :quantifier-prefix (#\{ :decimal-digits #\}) quantifier-prefix-repeat
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(minimum (integer-value :decimal-digits))
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(maximum (oneof finite (integer-value :decimal-digits))))
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(production :quantifier-prefix (#\{ :decimal-digits #\, #\}) quantifier-prefix-repeat-or-more
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(minimum (integer-value :decimal-digits))
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(maximum (oneof infinite)))
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(production :quantifier-prefix (#\{ :decimal-digits #\, :decimal-digits #\}) quantifier-prefix-repeat-range
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(minimum (integer-value :decimal-digits 1))
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(maximum (oneof finite (integer-value :decimal-digits 2)))))
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(rule :decimal-digits ((integer-value integer))
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(production :decimal-digits (:decimal-digit) decimal-digits-first
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(integer-value (decimal-value :decimal-digit)))
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(production :decimal-digits (:decimal-digits :decimal-digit) decimal-digits-rest
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(integer-value (+ (* 10 (integer-value :decimal-digits)) (decimal-value :decimal-digit)))))
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(%charclass :decimal-digit)
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(deftype limit (oneof (finite integer) infinite))
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(define (reset-parens (x r-e-match) (p integer) (n-parens integer)) r-e-match
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(if (= n-parens 0)
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x
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(let ((y r-e-match (tuple r-e-match (& end-index x)
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(set-nth (& captures x) p (oneof absent)))))
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(reset-parens y (+ p 1) (- n-parens 1)))))
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(define (repeat-matcher (body matcher) (min integer) (max limit) (greedy boolean) (paren-index integer) (n-body-parens integer)) matcher
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(if (case max
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((finite m integer) (= m 0))
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(infinite false))
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(c x)
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(let ((d continuation (function ((y r-e-match))
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(if (and (= min 0)
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(= (& end-index y) (& end-index x)))
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(oneof failure)
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(let ((new-min integer (if (= min 0) 0 (- min 1)))
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(new-max limit (case max
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((finite m integer) (oneof finite (- m 1)))
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(infinite (oneof infinite)))))
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((repeat-matcher body new-min new-max greedy paren-index n-body-parens) t y c)))))
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(xr r-e-match (reset-parens x paren-index n-body-parens)))
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(if (/= min 0)
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(body t xr d)
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(if greedy
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(case (body t xr d)
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((success z r-e-match) (oneof success z))
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(failure (c x)))
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(case (c x)
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((success z r-e-match) (oneof success z))
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(failure (body t xr d)))))))))
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(%print-actions)
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(%subsection "Assertions")
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(rule :assertion ((test-assertion (-> (r-e-input r-e-match) boolean)))
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(production :assertion (#\^) assertion-beginning
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((test-assertion (t r-e-input) (x r-e-match))
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(if (= (& end-index x) 0)
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true
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(and (& multiline t)
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(character-set-member (nth (& str t) (- (& end-index x) 1)) line-terminators)))))
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(production :assertion (#\$) assertion-end
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((test-assertion (t r-e-input) (x r-e-match))
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(if (= (& end-index x) (length (& str t)))
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true
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(and (& multiline t)
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(character-set-member (nth (& str t) (& end-index x)) line-terminators)))))
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(production :assertion (#\\ #\b) assertion-word-boundary
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((test-assertion (t r-e-input) (x r-e-match))
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(at-word-boundary (& end-index x) (& str t))))
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(production :assertion (#\\ #\B) assertion-non-word-boundary
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((test-assertion (t r-e-input) (x r-e-match))
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(not (at-word-boundary (& end-index x) (& str t))))))
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(%print-actions)
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(define (at-word-boundary (i integer) (s string)) boolean
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(xor (in-word (- i 1) s) (in-word i s)))
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(define (in-word (i integer) (s string)) boolean
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(if (or (= i -1) (= i (length s)))
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false
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(character-set-member (nth s i) re-word-characters)))
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(%section "Atoms")
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(rule :atom ((gen-matcher matcher-generator) (count-parens integer))
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(production :atom (:pattern-character) atom-pattern-character
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((gen-matcher (paren-index integer :unused))
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(character-matcher ($default-action :pattern-character)))
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(count-parens 0))
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(production :atom (#\.) atom-dot
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((gen-matcher (paren-index integer :unused))
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(character-set-matcher line-terminators true))
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(count-parens 0))
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(production :atom (#\\ :atom-escape) atom-atom-escape
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(gen-matcher (gen-matcher :atom-escape))
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(count-parens 0))
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(production :atom (:character-class) atom-character-class
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((gen-matcher (paren-index integer :unused))
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(let ((a (set character) (acceptance-set :character-class)))
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(character-set-matcher a (invert :character-class))))
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(count-parens 0))
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(production :atom (#\( :disjunction #\)) atom-parentheses
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((gen-matcher (paren-index integer))
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(let ((match matcher ((gen-matcher :disjunction) (+ paren-index 1))))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(let ((d continuation
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(function ((y r-e-match))
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(let ((updated-captures (vector capture)
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(set-nth (& captures y) paren-index
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(oneof present (subseq (& str t) (& end-index x) (- (& end-index y) 1))))))
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(c (tuple r-e-match (& end-index y) updated-captures))))))
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(match t x d)))))
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(count-parens (+ (count-parens :disjunction) 1)))
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(production :atom (#\( #\? #\: :disjunction #\)) atom-non-capturing-parentheses
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(gen-matcher (gen-matcher :disjunction))
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(count-parens (count-parens :disjunction)))
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(production :atom (#\( #\? #\= :disjunction #\)) atom-positive-lookahead
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((gen-matcher (paren-index integer))
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(let ((match matcher ((gen-matcher :disjunction) paren-index)))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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;(let ((d continuation
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; (function ((y r-e-match))
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; (c (tuple r-e-match (& end-index x) (& captures y))))))
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; (match t x d)))))
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(case (match t x success-continuation)
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((success y r-e-match)
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(c (tuple r-e-match (& end-index x) (& captures y))))
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(failure (oneof failure))))))
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(count-parens (count-parens :disjunction)))
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(production :atom (#\( #\? #\! :disjunction #\)) atom-negative-lookahead
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((gen-matcher (paren-index integer))
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(let ((match matcher ((gen-matcher :disjunction) paren-index)))
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(function ((t r-e-input) (x r-e-match) (c continuation))
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(case (match t x success-continuation)
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((success y r-e-match :unused) (oneof failure))
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(failure (c x))))))
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(count-parens (count-parens :disjunction))))
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(%charclass :pattern-character)
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(%print-actions)
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(%section "Escapes")
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(rule :atom-escape ((gen-matcher matcher-generator))
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(production :atom-escape (:decimal-escape) atom-escape-decimal
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((gen-matcher (paren-index integer))
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(let ((n integer (escape-value :decimal-escape)))
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(if (= n 0)
|
|
(character-matcher #?0000)
|
|
(if (> n paren-index)
|
|
(throw (oneof syntax-error))
|
|
(backreference-matcher n))))))
|
|
(production :atom-escape (:character-escape) atom-escape-character
|
|
((gen-matcher (paren-index integer :unused))
|
|
(character-matcher (character-value :character-escape))))
|
|
(production :atom-escape (:character-class-escape) atom-escape-character-class
|
|
((gen-matcher (paren-index integer :unused))
|
|
(character-set-matcher (acceptance-set :character-class-escape) false))))
|
|
(%print-actions)
|
|
|
|
(define (backreference-matcher (n integer)) matcher
|
|
(function ((t r-e-input) (x r-e-match) (c continuation))
|
|
(case (nth-backreference x n)
|
|
((present ref string)
|
|
(let ((i integer (& end-index x))
|
|
(s string (& str t)))
|
|
(let ((j integer (+ i (length ref))))
|
|
(if (> j (length s))
|
|
(oneof failure)
|
|
(if (string-equal (subseq s i (- j 1)) ref) ;*********ignore case?
|
|
(c (tuple r-e-match j (& captures x)))
|
|
(oneof failure))))))
|
|
(absent (c x)))))
|
|
|
|
(define (nth-backreference (x r-e-match) (n integer)) capture
|
|
(nth (& captures x) (- n 1)))
|
|
|
|
|
|
(rule :character-escape ((character-value character))
|
|
(production :character-escape (:control-escape) character-escape-control
|
|
(character-value (character-value :control-escape)))
|
|
(production :character-escape (#\c :control-letter) character-escape-control-letter
|
|
(character-value (code-to-character (bitwise-and (character-to-code ($default-action :control-letter)) 31))))
|
|
(production :character-escape (:hex-escape) character-escape-hex
|
|
(character-value (character-value :hex-escape)))
|
|
(production :character-escape (:identity-escape) character-escape-identity
|
|
(character-value ($default-action :identity-escape))))
|
|
|
|
(%charclass :control-letter)
|
|
(%charclass :identity-escape)
|
|
|
|
(rule :control-escape ((character-value character))
|
|
(production :control-escape (#\f) control-escape-form-feed (character-value #?000C))
|
|
(production :control-escape (#\n) control-escape-new-line (character-value #?000A))
|
|
(production :control-escape (#\r) control-escape-return (character-value #?000D))
|
|
(production :control-escape (#\t) control-escape-tab (character-value #?0009))
|
|
(production :control-escape (#\v) control-escape-vertical-tab (character-value #?000B)))
|
|
(%print-actions)
|
|
|
|
|
|
(%subsection "Decimal Escapes")
|
|
|
|
(rule :decimal-escape ((escape-value integer))
|
|
(production :decimal-escape (:decimal-integer-literal (:- :decimal-digit)) decimal-escape-integer
|
|
(escape-value (integer-value :decimal-integer-literal))))
|
|
|
|
(rule :decimal-integer-literal ((integer-value integer))
|
|
(production :decimal-integer-literal (#\0) decimal-integer-literal-0
|
|
(integer-value 0))
|
|
(production :decimal-integer-literal (:non-zero-decimal-digits) decimal-integer-literal-nonzero
|
|
(integer-value (integer-value :non-zero-decimal-digits))))
|
|
|
|
(rule :non-zero-decimal-digits ((integer-value integer))
|
|
(production :non-zero-decimal-digits (:non-zero-digit) non-zero-decimal-digits-first
|
|
(integer-value (decimal-value :non-zero-digit)))
|
|
(production :non-zero-decimal-digits (:non-zero-decimal-digits :decimal-digit) non-zero-decimal-digits-rest
|
|
(integer-value (+ (* 10 (integer-value :non-zero-decimal-digits)) (decimal-value :decimal-digit)))))
|
|
|
|
(%charclass :non-zero-digit)
|
|
(%print-actions)
|
|
|
|
|
|
(%subsection "Hexadecimal Escapes")
|
|
|
|
(rule :hex-escape ((character-value character))
|
|
(production :hex-escape (#\x :hex-digit :hex-digit) hex-escape-2
|
|
(character-value (code-to-character (+ (* 16 (hex-value :hex-digit 1))
|
|
(hex-value :hex-digit 2)))))
|
|
(production :hex-escape (#\u :hex-digit :hex-digit :hex-digit :hex-digit) hex-escape-4
|
|
(character-value (code-to-character (+ (+ (+ (* 4096 (hex-value :hex-digit 1))
|
|
(* 256 (hex-value :hex-digit 2)))
|
|
(* 16 (hex-value :hex-digit 3)))
|
|
(hex-value :hex-digit 4))))))
|
|
(%charclass :hex-digit)
|
|
(%print-actions)
|
|
|
|
|
|
(%subsection "Character Class Escapes")
|
|
|
|
(rule :character-class-escape ((acceptance-set (set character)))
|
|
(production :character-class-escape (#\s) character-class-escape-whitespace
|
|
(acceptance-set re-whitespaces))
|
|
(production :character-class-escape (#\S) character-class-escape-non-whitespace
|
|
(acceptance-set (character-set-difference (set-of-ranges character #?0000 #?FFFF) re-whitespaces)))
|
|
(production :character-class-escape (#\d) character-class-escape-digit
|
|
(acceptance-set re-digits))
|
|
(production :character-class-escape (#\D) character-class-escape-non-digit
|
|
(acceptance-set (character-set-difference (set-of-ranges character #?0000 #?FFFF) re-digits)))
|
|
(production :character-class-escape (#\w) character-class-escape-word
|
|
(acceptance-set re-word-characters))
|
|
(production :character-class-escape (#\W) character-class-escape-non-word
|
|
(acceptance-set (character-set-difference (set-of-ranges character #?0000 #?FFFF) re-word-characters))))
|
|
(%print-actions)
|
|
|
|
|
|
(%section "User-Specified Character Classes")
|
|
|
|
(rule :character-class ((acceptance-set (set character)) (invert boolean))
|
|
(production :character-class (#\[ (:- #\^) :class-ranges #\]) character-class-positive
|
|
(acceptance-set (acceptance-set :class-ranges))
|
|
(invert false))
|
|
(production :character-class (#\[ #\^ :class-ranges #\]) character-class-negative
|
|
(acceptance-set (acceptance-set :class-ranges))
|
|
(invert true)))
|
|
|
|
(rule :class-ranges ((acceptance-set (set character)))
|
|
(production :class-ranges () class-ranges-none
|
|
(acceptance-set (set-of character)))
|
|
(production :class-ranges ((:nonempty-class-ranges dash)) class-ranges-some
|
|
(acceptance-set (acceptance-set :nonempty-class-ranges))))
|
|
|
|
(grammar-argument :delta dash no-dash)
|
|
|
|
(rule (:nonempty-class-ranges :delta) ((acceptance-set (set character)))
|
|
(production (:nonempty-class-ranges :delta) ((:class-atom dash)) nonempty-class-ranges-final
|
|
(acceptance-set (acceptance-set :class-atom)))
|
|
(production (:nonempty-class-ranges :delta) ((:class-atom :delta) (:nonempty-class-ranges no-dash)) nonempty-class-ranges-non-final
|
|
(acceptance-set
|
|
(character-set-union (acceptance-set :class-atom)
|
|
(acceptance-set :nonempty-class-ranges))))
|
|
(production (:nonempty-class-ranges :delta) ((:class-atom :delta) #\- (:class-atom dash) :class-ranges) nonempty-class-ranges-range
|
|
(acceptance-set
|
|
(let ((range (set character) (character-range (acceptance-set :class-atom 1)
|
|
(acceptance-set :class-atom 2))))
|
|
(character-set-union range (acceptance-set :class-ranges))))))
|
|
(%print-actions)
|
|
|
|
(define (character-range (low (set character)) (high (set character))) (set character)
|
|
(if (or (/= (character-set-length low) 1) (/= (character-set-length high) 1))
|
|
(throw (oneof syntax-error))
|
|
(let ((l character (character-set-min low))
|
|
(h character (character-set-min high)))
|
|
(if (char<= l h)
|
|
(set-of-ranges character l h)
|
|
(throw (oneof syntax-error))))))
|
|
|
|
|
|
(%subsection "Character Class Range Atoms")
|
|
|
|
(rule (:class-atom :delta) ((acceptance-set (set character)))
|
|
(production (:class-atom :delta) ((:class-character :delta)) class-atom-character
|
|
(acceptance-set (set-of character ($default-action :class-character))))
|
|
(production (:class-atom :delta) (#\\ :class-escape) class-atom-escape
|
|
(acceptance-set (acceptance-set :class-escape))))
|
|
|
|
(%charclass (:class-character dash))
|
|
(%charclass (:class-character no-dash))
|
|
|
|
(rule :class-escape ((acceptance-set (set character)))
|
|
(production :class-escape (:decimal-escape) class-escape-decimal
|
|
(acceptance-set
|
|
(if (= (escape-value :decimal-escape) 0)
|
|
(set-of character #?0000)
|
|
(throw (oneof syntax-error)))))
|
|
(production :class-escape (#\b) class-escape-backspace
|
|
(acceptance-set (set-of character #?0008)))
|
|
(production :class-escape (:character-escape) class-escape-character-escape
|
|
(acceptance-set (set-of character (character-value :character-escape))))
|
|
(production :class-escape (:character-class-escape) class-escape-character-class-escape
|
|
(acceptance-set (acceptance-set :character-class-escape))))
|
|
(%print-actions)
|
|
)))
|
|
|
|
(defparameter *rl* (world-lexer *rw* 'regexp-lexer))
|
|
(defparameter *rg* (lexer-grammar *rl*)))
|
|
|
|
|
|
(defun run-regexp (regexp input &optional ignore-case multiline)
|
|
(let ((exec (first (lexer-parse *rl* regexp))))
|
|
(dotimes (i (length input) '(failure))
|
|
(let ((result (funcall exec (list input ignore-case multiline) i)))
|
|
(ecase (first result)
|
|
(success
|
|
(return (list* i (subseq input i (second result)) (cddr result))))
|
|
(failure))))))
|
|
|
|
#|
|
|
(progn
|
|
(depict-rtf-to-local-file
|
|
"JS20/RegExpGrammar.rtf"
|
|
"Regular Expression Grammar"
|
|
#'(lambda (rtf-stream)
|
|
(depict-world-commands rtf-stream *rw* :visible-semantics nil)))
|
|
(depict-rtf-to-local-file
|
|
"JS20/RegExpSemantics.rtf"
|
|
"Regular Expression Semantics"
|
|
#'(lambda (rtf-stream)
|
|
(depict-world-commands rtf-stream *rw*))))
|
|
|
|
(progn
|
|
(depict-html-to-local-file
|
|
"JS20/RegExpGrammar.html"
|
|
"Regular Expression Grammar"
|
|
t
|
|
#'(lambda (html-stream)
|
|
(depict-world-commands html-stream *rw* :visible-semantics nil))
|
|
:external-link-base "notation.html")
|
|
(depict-html-to-local-file
|
|
"JS20/RegExpSemantics.html"
|
|
"Regular Expression Semantics"
|
|
t
|
|
#'(lambda (html-stream)
|
|
(depict-world-commands html-stream *rw*))
|
|
:external-link-base "notation.html"))
|
|
|
|
(with-local-output (s "JS20/RegExpGrammar.txt") (print-lexer *rl* s) (print-grammar *rg* s))
|
|
|
|
(lexer-pparse *rl* "a+" :trace t)
|
|
(lexer-pparse *rl* "[]+" :trace t)
|
|
(run-regexp "(0x|0)2" "0x20")
|
|
(run-regexp "(a*)b\\1+c" "aabaaaac")
|
|
(run-regexp "(a*)b\\1+" "baaaac")
|
|
(run-regexp "b(a+)(a+)?(a+)c" "baaaac")
|
|
(run-regexp "(((a+)?(b+)?c)*)" "aacbbbcac")
|
|
(run-regexp "(\\s\\S\\s)" "aac xa d fds fds sac")
|
|
(run-regexp "(\\s)" "aac xa deac")
|
|
(run-regexp "[01234]+aa+" "93-43aabbc")
|
|
(run-regexp "[\\101A-ae-]+" "93ABC-@ezy43abc")
|
|
(run-regexp "[\\181A-ae-]+" "93ABC-@ezy43abc")
|
|
(run-regexp "b[ace]+" "baaaacecfe")
|
|
(run-regexp "b[^a]+" "baaaabc")
|
|
(run-regexp "(?=(a+))a*b\\1" "baaabac")
|
|
(run-regexp "(?=(a+))" "baaabac")
|
|
(run-regexp "(.*?)a(?!(a+)b\\2c)\\2(.*)" "baaabaac")
|
|
(run-regexp "(aa|aabaac|ba|b|c)*" "aabaac")
|
|
|#
|
|
|
|
#+allegro (clean-grammar *rg*) ;Remove this line if you wish to print the grammar's state tables.
|
|
(length (grammar-states *rg*))
|