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(defpackage :org.euandre.resyn
(:use :cl)
(:shadow :match
:substitute)
(:export :match
:substitute
:reader))
(in-package :org.euandre.resyn)
#|
TODO:
- capture group
- (#~m/a(b+)c/i "abc ABbC") => [["abc" "ABbC"] ["b" "Bb"]], or ["abc" "ABbC"] + [["b"] ["Bb"]]
- robust ignore-case? (instead of #'STRING-DOWNCASE)
- global?
- BRE, ERE e PCRE
- glob?
- lambda expression vs funcallabla instance: simplicity vs read/print support
- turn the "if" inside #'read-regex into a compiler macro
- better error message than ecase?
- gensyms
- ack let over lambda
- split: (split #~/(,| and) ?/ "a, b, c and d") => ["a" "b" "c" "d"]
regcomp: BRE, ERE
cl-ppcre: PCRE
(#~m/a(b+)(c)/ "123 456")
[]
(#~m/a(b+)(c)/ "abbc")
[["abbc", "bb", "c"]]
(#~m/a(b+)(c)/ "abbc abc")
[["abbc", "bb", "c"]
["abc", "b", "c"]]
(#~m/a(b+)(c)/ "abbc abc")
"abbc"
["bb" "c"]
(#~m/a(b+)(c)/ "ac ac")
nil
nil
(#~m/a(b+)(c)/ "abbc abc")
["abbc" "abc"]
[["bb" "c"] ["b" "c"]]
(let [matches (#~m/a(b+)(c)/ "abbc abc")]
(when (seq matches))
...)
(let [(matches captures) (#~m/a(b+)(c)/ "abbc abc")]
(map (fn [[b c]]
...)
captures))
(loop
for (match [word spaces]) = (#~/([a-z]+)( +)/ "a b c d e f")
when (...))
|#
(defun segment-reader (stream char n)
"FIXME: docstring"
(if (<= n 0)
(list '() '())
(let ((chars '())
(fmts '())
(escaping? nil))
(do ((curr (read-char stream) (read-char stream)))
((and (char= char curr) (not escaping?)))
(case curr
(#\%
(if escaping?
(push #\% chars)
(progn
(push #\~ chars)
(push #\a chars)
(read-char stream) ;; discard #\(
(push `(progn ,@(read-delimited-list #\) stream))
fmts)))
(setf escaping? nil))
(#\~
(when escaping?
(push #\\ chars))
(push #\~ chars)
(push #\~ chars)
(setf escaping? nil))
(#\\
(when escaping?
(push #\\ chars)
(push #\\ chars))
(setf escaping? (not escaping?)))
(t
(when escaping?
(push #\\ chars))
(push curr chars)
(setf escaping? nil))))
(destructuring-bind (segments formats)
(segment-reader stream char (1- n))
(list
(cons (coerce (nreverse chars) 'string)
segments)
(cons (nreverse fmts) formats))))))
(defun read-regex (stream char n)
"FIXME: docstring"
(destructuring-bind (segments formats)
(segment-reader stream
char
n)
(mapcar (lambda (seg fmt)
(if fmt
`(format nil ,seg ,@fmt)
(format nil seg)))
segments
formats)))
(defun match (regex str type &key ignore-case? global?)
"FIXME: docstring"
(declare (ignore global?)) ;; FIXME: implement global matching
(ecase type
((:ERE :PCRE) ;; FIXME: implement separate rules
(cl-ppcre:scan-to-strings
(if ignore-case? (string-downcase regex) regex) ; FIXME: more robust
(if ignore-case? (string-downcase str) str))))) ; handling of case
(defun substitute (regex str replacement type &key ignore-case? global?)
"FIXME: docstring"
(declare (ignore global?)) ;; FIXME: implement non-global replacing
(ecase type
((:BRE :ERE :PCRE) ;; FIXME: implement separate rules
(cl-ppcre:regex-replace-all
(if ignore-case? (string-downcase regex) regex) ; FIXME: better
(if ignore-case? (string-downcase str) str) ; case handling
(if ignore-case? (string-downcase replacement) replacement)))))
(defun reader (stream sub-char numarg)
"FIXME: docstring"
(declare (ignore sub-char numarg))
(let* ((ignore-case? nil)
(global? nil)
(type nil)
(seen-modifiers '())
(mode-char (read-char stream))
(parts (read-regex stream
(ecase mode-char
((#\m #\s) (read-char stream))
(#\/ #\/))
(ecase mode-char
((#\m #\/) 1)
(#\s 2))))
(regex (first parts))
(replacement (second parts)))
(loop while t do
(let ((modifier (peek-char nil stream)))
(when (member modifier seen-modifiers :test #'char=)
(return))
(case modifier
(#\i (setf ignore-case? t))
(#\g (setf global? t))
(#\B (if type (return) (setf type :BRE)))
(#\E (if type (return) (setf type :ERE)))
(#\P (if type (return) (setf type :PCRE)))
(t (return)))
(push modifier seen-modifiers)
(read-char stream)))
(when (not type)
(setf type :ERE))
(ecase mode-char
((#\m #\/)
`(lambda (str)
(match
,regex
str
,type
:ignore-case? ,ignore-case?
:global? ,global?)))
(#\s
`(lambda (str)
(substitute
,regex
str
,replacement
,type
:ignore-case? ,ignore-case?
:global? ,global?))))))
|
