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glob: Support square brackets in patterns.
* guix/glob.scm (wildcard-indices): Remove. (parse-bracket): New procedure. (compile-glob-pattern): Rewrite. Support square brackets for sets and ranges. (glob-match?): Support sets and ranges. * tests/glob.scm (test-compile-glob-pattern) (test-glob-match): New macros. Use them to rewrite the existing tests, and add new tests.
This commit is contained in:
Ludovic Courtès
parent
675e81a082
commit
e914b398af
2 changed files with 99 additions and 63 deletions
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@ -25,20 +25,17 @@ (define-module (guix glob)
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;;;
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;;; This is a minimal implementation of "glob patterns" (info "(libc)
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;;; Globbbing"). It is currently limited to simple patterns and does not
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;;; support braces and square brackets, for instance.
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;;; support braces, for instance.
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;;;
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;;; Code:
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(define (wildcard-indices str)
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"Return the list of indices in STR where wildcards can be found."
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(let loop ((index 0)
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(result '()))
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(if (= index (string-length str))
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(reverse result)
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(loop (+ 1 index)
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(case (string-ref str index)
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((#\? #\*) (cons index result))
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(else result))))))
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(define (parse-bracket chars)
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"Parse CHARS, a list of characters that extracted from a '[...]' sequence."
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(match chars
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((start #\- end)
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`(range ,start ,end))
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(lst
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`(set ,@lst))))
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(define (compile-glob-pattern str)
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"Return an sexp that represents the compiled form of STR, a glob pattern
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@ -48,29 +45,43 @@ (define flatten
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(((? string? str)) str)
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(x x)))
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(let loop ((index 0)
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(indices (wildcard-indices str))
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(define (cons-string chars lst)
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(match chars
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(() lst)
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(_ (cons (list->string (reverse chars)) lst))))
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(let loop ((chars (string->list str))
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(pending '())
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(brackets 0)
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(result '()))
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(match indices
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(match chars
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(()
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(flatten (cond ((zero? index)
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(list str))
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((= index (string-length str))
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(reverse result))
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(else
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(reverse (cons (string-drop str index)
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result))))))
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((wildcard-index . rest)
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(let ((wildcard (match (string-ref str wildcard-index)
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(flatten (reverse (if (null? pending)
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result
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(cons-string pending result)))))
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(((and chr (or #\? #\*)) . rest)
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(let ((wildcard (match chr
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(#\? '?)
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(#\* '*))))
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(match (substring str index wildcard-index)
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("" (loop (+ 1 wildcard-index)
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rest
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(cons wildcard result)))
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(str (loop (+ 1 wildcard-index)
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rest
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(cons* wildcard str result)))))))))
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(if (zero? brackets)
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(loop rest '() 0
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(cons* wildcard (cons-string pending result)))
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(loop rest (cons chr pending) brackets result))))
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((#\[ . rest)
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(if (zero? brackets)
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(loop rest '() (+ 1 brackets)
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(cons-string pending result))
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(loop rest (cons #\[ pending) (+ 1 brackets) result)))
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((#\] . rest)
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(cond ((zero? brackets)
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(error "unexpected closing bracket" str))
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((= 1 brackets)
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(loop rest '() 0
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(cons (parse-bracket (reverse pending)) result)))
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(else
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(loop rest (cons #\] pending) (- brackets 1) result))))
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((chr . rest)
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(loop rest (cons chr pending) brackets result)))))
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(define (glob-match? pattern str)
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"Return true if STR matches PATTERN, a compiled glob pattern as returned by
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@ -78,11 +89,12 @@ (define (glob-match? pattern str)
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(let loop ((pattern pattern)
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(str str))
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(match pattern
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((? string? literal) (string=? literal str))
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(((? string? one)) (string=? one str))
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(('*) #t)
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(('?) (= 1 (string-length str)))
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(() #t)
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((? string? literal)
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(string=? literal str))
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(()
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(string-null? str))
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(('*)
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#t)
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(('* suffix . rest)
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(match (string-contains str suffix)
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(#f #f)
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@ -92,6 +104,19 @@ (define (glob-match? pattern str)
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(('? . rest)
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(and (>= (string-length str) 1)
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(loop rest (string-drop str 1))))
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((('range start end) . rest)
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(and (>= (string-length str) 1)
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(let ((chr (string-ref str 0)))
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(and (char-set-contains? (ucs-range->char-set
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(char->integer start)
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(+ 1 (char->integer end)))
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chr)
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(loop rest (string-drop str 1))))))
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((('set . chars) . rest)
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(and (>= (string-length str) 1)
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(let ((chr (string-ref str 0)))
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(and (char-set-contains? (list->char-set chars) chr)
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(loop rest (string-drop str 1))))))
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((prefix . rest)
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(and (string-prefix? prefix str)
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(loop rest (string-drop str (string-length prefix))))))))
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@ -23,36 +23,47 @@ (define-module (test-glob)
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(test-begin "glob")
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(test-equal "compile-glob-pattern, no wildcards"
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"foo"
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(compile-glob-pattern "foo"))
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(define-syntax test-compile-glob-pattern
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(syntax-rules (=>)
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((_ pattern => result rest ...)
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(begin
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(test-equal (format #f "compile-glob-pattern, ~s" pattern)
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result
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(compile-glob-pattern pattern))
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(test-compile-glob-pattern rest ...)))
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((_)
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#t)))
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(test-equal "compile-glob-pattern, Kleene star"
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'("foo" * "bar")
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(compile-glob-pattern "foo*bar"))
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(define-syntax test-glob-match
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(syntax-rules (matches and not)
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((_ (pattern-string matches strings ... (and not others ...)) rest ...)
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(begin
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(test-assert (format #f "glob-match? ~s" pattern-string)
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(let ((pattern (compile-glob-pattern pattern-string)))
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(and (glob-match? pattern strings) ...
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(not (glob-match? pattern others)) ...)))
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(test-glob-match rest ...)))
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((_)
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#t)))
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(test-equal "compile-glob-pattern, question mark"
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'(? "foo" *)
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(compile-glob-pattern "?foo*"))
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(test-compile-glob-pattern
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"foo" => "foo"
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"?foo*" => '(? "foo" *)
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"foo[1-5]" => '("foo" (range #\1 #\5))
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"foo[abc]bar" => '("foo" (set #\a #\b #\c) "bar")
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"foo[a[b]c]bar" => '("foo" (set #\a #\[ #\b #\] #\c) "bar")
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"[123]x" => '((set #\1 #\2 #\3) "x")
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"[a-z]" => '((range #\a #\z)))
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(test-assert "literal match"
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(let ((pattern (compile-glob-pattern "foo")))
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(and (glob-match? pattern "foo")
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(not (glob-match? pattern "foobar"))
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(not (glob-match? pattern "barfoo")))))
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(test-assert "trailing star"
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(let ((pattern (compile-glob-pattern "foo*")))
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(and (glob-match? pattern "foo")
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(glob-match? pattern "foobar")
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(not (glob-match? pattern "xfoo")))))
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(test-assert "question marks"
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(let ((pattern (compile-glob-pattern "foo??bar")))
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(and (glob-match? pattern "fooxxbar")
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(glob-match? pattern "fooZZbar")
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(not (glob-match? pattern "foobar"))
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(not (glob-match? pattern "fooxxxbar"))
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(not (glob-match? pattern "fooxxbarzz")))))
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(test-glob-match
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("foo" matches "foo" (and not "foobar" "barfoo"))
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("foo*" matches "foo" "foobar" (and not "xfoo"))
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("foo??bar" matches "fooxxbar" "fooZZbar"
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(and not "foobar" "fooxxxbar" "fooxxbarzz"))
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("foo?" matches "foox" (and not "fooxx"))
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("ab[0-9]c" matches "ab0c" "ab7c" "ab9c"
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(and not "ab-c" "ab00c" "ab3"))
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("ab[cdefg]" matches "abc" "abd" "abg"
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(and not "abh" "abcd" "ab[")))
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(test-end "glob")
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