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<!-- ML-Doc/regexp-sig.mldoc --><!-- Entities.sgml entry <!ENTITY REGEXP SDATA "../regexp-sig.sml"> --><!DOCTYPE ML-DOC SYSTEM><COPYRIGHT OWNER="Bell Labs, Lucent Technologies" YEAR=1998><VERSION VERID="1.0" YEAR=1998 MONTH=6 DAY=3><TITLE>The REGEXP signature</TITLE><INTERFACE><HEAD>The <CD/REGEXP/ signature</HEAD><!-- optional SEEALSO; uncomment to use --><SEEALSO> <FCTREF/RegExpFn/ <STRREF/MatchTree/</SEEALSO><PP>This is the signature of a regular expressions matchingstructure. Such a structure is created by applying the functor<CD/RegExpFn/ to a given concrete syntax for regular expressions and agiven matching engine.<PP><SIGNATURE SIGID="REGEXP"> <SIGBODY SIGID="REGEXP" FILE=REGEXP> <SPEC> <TYPE><ID>regexp <COMMENT><PP> the type of a compiled regular expression <SPEC> <VAL>compile<TY>(char,'a) StringCvt.reader -> (regexp,'a) StringCvt.reader <COMMENT> <PROTOTY> compile <ARG/getc/ </PROTOTY> Given a character reader <ARG/getc/, this function returns a reader that parses a regular expression in the concrete syntax fromthe stream and compiles it. <SPEC> <VAL>compileString<TY>string -> regexp <COMMENT> <PROTOTY> compileString <ARG/s/ </PROTOTY> compiles a string representing a regular expression in theconcrete syntax. The function <CD/compileString/ is equivalent to<CD/StringCvt.scanString compile/. <SPEC> <VAL>find<TY>regexp -> (char,'a) StringCvt.reader -> ({pos : 'a, len : int} option MatchTree.match_tree,'a) StringCvt.reader <COMMENT> <PROTOTY> find <ARG/r/ <ARG/getc/ </PROTOTY> Given a compiled regular expression <ARG/r/ and a character reader <ARG/getc/, this function returns a reader that scans the stream for the firstmatch of the regular expression. The reader returns <CD/NONE/ ifno match is found. <SPEC> <VAL>prefix<TY>regexp -> (char,'a) StringCvt.reader -> ({pos : 'a, len : int} option MatchTree.match_tree,'a) StringCvt.reader <COMMENT> <PROTOTY> prefix <ARG/r/ <ARG/getc/ </PROTOTY> Given a compiled regular expression <ARG/r/ and a character reader <ARG/getc/, this functions returns a reader that attempts tomatch the stream at its current position with the regularexpression. The reader returns <CD/NONE/ if there is not match at thecurrent position of the stream. <SPEC> <VAL>match<TY>(string * ({pos : 'a, len : int} option MatchTree.match_tree -> 'b)) list -> (char,'a) StringCvt.reader -> ('b,'a) StringCvt.reader <COMMENT> <PROTOTY> match <ARG/l/ <ARG/getc/ </PROTOTY> Given a list <ARG/l/ of tuples made up of a stringrepresenting a regular expression in the concrete syntax and afunction from matching tree to values of type <CD/'b/, and given a character reader <ARG/getc/, this functionreturns a reader that attempts to match one of the given regularexpressions at the current position of the stream. If a match isfound, the corresponding function is applied to the match tree and theresult is returned. The reader returns <CD/NONE/ if no match is found.</SIGNATURE></INTERFACE>⌨️ 快捷键说明
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