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diff --git a/qmake/tools/qregexp.cpp b/qmake/tools/qregexp.cpp index 500efed..0c1f060 100644 --- a/qmake/tools/qregexp.cpp +++ b/qmake/tools/qregexp.cpp @@ -74,836 +74,848 @@ */ /*! \class QRegExp qregexp.h \reentrant \brief The QRegExp class provides pattern matching using regular expressions. \ingroup tools \ingroup misc \ingroup shared \mainclass \keyword regular expression Regular expressions, or "regexps", provide a way to find patterns within text. This is useful in many contexts, for example: \table \row \i Validation \i A regexp can be used to check whether a piece of text meets some criteria, e.g. is an integer or contains no whitespace. \row \i Searching \i Regexps provide a much more powerful means of searching text than simple string matching does. For example we can create a regexp which says "find one of the words 'mail', 'letter' or 'correspondence' but not any of the words 'email', 'mailman' 'mailer', 'letterbox' etc." \row \i Search and Replace \i A regexp can be used to replace a pattern with a piece of text, for example replace all occurrences of '&' with '\&' except where the '&' is already followed by 'amp;'. \row \i String Splitting \i A regexp can be used to identify where a string should be split into its component fields, e.g. splitting tab-delimited strings. \endtable We present a very brief introduction to regexps, a description of Qt's regexp language, some code examples, and finally the function documentation itself. QRegExp is modeled on Perl's regexp language, and also fully supports Unicode. QRegExp can also be used in the weaker 'wildcard' (globbing) mode which works in a similar way to command shells. A good text on regexps is \e {Mastering Regular Expressions: Powerful Techniques for Perl and Other Tools} by Jeffrey E. Friedl, ISBN 1565922573. Experienced regexp users may prefer to skip the introduction and go directly to the relevant information. \tableofcontents \section1 Introduction Regexps are built up from expressions, quantifiers, and assertions. The simplest form of expression is simply a character, e.g. <b>x</b> or <b>5</b>. An expression can also be a set of characters. For example, <b>[ABCD]</b>, will match an <b>A</b> or a <b>B</b> or a <b>C</b> or a <b>D</b>. As a shorthand we could write this as <b>[A-D]</b>. If we want to match any of the captital letters in the English alphabet we can write <b>[A-Z]</b>. A quantifier tells the regexp engine how many occurrences of the expression we want, e.g. <b>x{1,1}</b> means match an <b>x</b> which occurs at least once and at most once. We'll look at assertions and more complex expressions later. Note that in general regexps cannot be used to check for balanced brackets or tags. For example if you want to match an opening html \c <b> and its closing \c </b> you can only use a regexp if you know that these tags are not nested; the html fragment, \c{<b>bold <b>bolder</b></b>} will not match as expected. If you know the maximum level of nesting it is possible to create a regexp that will match correctly, but for an unknown level of nesting, regexps will fail. We'll start by writing a regexp to match integers in the range 0 to 99. We will require at least one digit so we will start with <b>[0-9]{1,1}</b> which means match a digit exactly once. This regexp alone will match integers in the range 0 to 9. To match one or two digits we can increase the maximum number of occurrences so the regexp becomes <b>[0-9]{1,2}</b> meaning match a digit at least once and at most twice. However, this regexp as it stands will not match correctly. This regexp will match one or two digits \e within a string. To ensure that we match against the whole string we must use the anchor assertions. We need <b>^</b> (caret) which when it is the first character in the regexp means that the regexp must match from the beginning of the string. And we also need <b>$</b> (dollar) which when it is the last character in the regexp means that the regexp must match until the end of the string. So now our regexp is <b>^[0-9]{1,2}$</b>. Note that assertions, such as <b>^</b> and <b>$</b>, do not match any characters. If you've seen regexps elsewhere they may have looked different from the ones above. This is because some sets of characters and some quantifiers are so common that they have special symbols to represent them. <b>[0-9]</b> can be replaced with the symbol <b>\d</b>. The quantifier to match exactly one occurrence, <b>{1,1}</b>, can be replaced with the expression itself. This means that <b>x{1,1}</b> is exactly the same as <b>x</b> alone. So our 0 to 99 matcher could be written <b>^\d{1,2}$</b>. Another way of writing it would be <b>^\d\d{0,1}$</b>, i.e. from the start of the string match a digit followed by zero or one digits. In practice most people would write it <b>^\d\d?$</b>. The <b>?</b> is a shorthand for the quantifier <b>{0,1}</b>, i.e. a minimum of no occurrences a maximum of one occurrence. This is used to make an expression optional. The regexp <b>^\d\d?$</b> means "from the beginning of the string match one digit followed by zero or one digits and then the end of the string". Our second example is matching the words 'mail', 'letter' or 'correspondence' but without matching 'email', 'mailman', 'mailer', 'letterbox' etc. We'll start by just matching 'mail'. In full the regexp is, <b>m{1,1}a{1,1}i{1,1}l{1,1}</b>, but since each expression itself is automatically quantified by <b>{1,1}</b> we can simply write this as <b>mail</b>; an 'm' followed by an 'a' followed by an 'i' followed by an 'l'. The symbol '|' (bar) is used for \e alternation, so our regexp now becomes <b>mail|letter|correspondence</b> which means match 'mail' \e or 'letter' \e or 'correspondence'. Whilst this regexp will find the words we want it will also find words we don't want such as 'email'. We will start by putting our regexp in parentheses, <b>(mail|letter|correspondence)</b>. Parentheses have two effects, firstly they group expressions together and secondly they identify parts of the regexp that we wish to \link #capturing-text capture \endlink. Our regexp still matches any of the three words but now they are grouped together as a unit. This is useful for building up more complex regexps. It is also useful because it allows us to examine which of the words actually matched. We need to use another assertion, this time <b>\b</b> "word boundary": <b>\b(mail|letter|correspondence)\b</b>. This regexp means "match a word boundary followed by the expression in parentheses followed by another word boundary". The <b>\b</b> assertion matches at a \e position in the regexp not a \e character in the regexp. A word boundary is any non-word character such as a space a newline or the beginning or end of the string. For our third example we want to replace ampersands with the HTML entity '\&'. The regexp to match is simple: <b>\&</b>, i.e. match one ampersand. Unfortunately this will mess up our text if some of the ampersands have already been turned into HTML entities. So what we really want to say is replace an ampersand providing it is not followed by 'amp;'. For this we need the negative lookahead assertion and our regexp becomes: <b>\&(?!amp;)</b>. The negative lookahead assertion is introduced with '(?!' and finishes at the ')'. It means that the text it contains, 'amp;' in our example, must \e not follow the expression that preceeds it. Regexps provide a rich language that can be used in a variety of ways. For example suppose we want to count all the occurrences of 'Eric' and 'Eirik' in a string. Two valid regexps to match these are <b>\\b(Eric|Eirik)\\b</b> and <b>\\bEi?ri[ck]\\b</b>. We need the word boundary '\b' so we don't get 'Ericsson' etc. The second regexp actually matches more than we want, 'Eric', 'Erik', 'Eiric' and 'Eirik'. We will implement some the examples above in the \link #code-examples code examples \endlink section. \target characters-and-abbreviations-for-sets-of-characters \section1 Characters and Abbreviations for Sets of Characters \table \header \i Element \i Meaning \row \i <b>c</b> \i Any character represents itself unless it has a special regexp meaning. Thus <b>c</b> matches the character \e c. \row \i <b>\\c</b> \i A character that follows a backslash matches the character itself except where mentioned below. For example if you wished to match a literal caret at the beginning of a string you would write <b>\^</b>. \row \i <b>\\a</b> \i This matches the ASCII bell character (BEL, 0x07). \row \i <b>\\f</b> \i This matches the ASCII form feed character (FF, 0x0C). \row \i <b>\\n</b> \i This matches the ASCII line feed character (LF, 0x0A, Unix newline). \row \i <b>\\r</b> \i This matches the ASCII carriage return character (CR, 0x0D). \row \i <b>\\t</b> \i This matches the ASCII horizontal tab character (HT, 0x09). \row \i <b>\\v</b> \i This matches the ASCII vertical tab character (VT, 0x0B). \row \i <b>\\xhhhh</b> \i This matches the Unicode character corresponding to the hexadecimal number hhhh (between 0x0000 and 0xFFFF). \0ooo (i.e., \zero ooo) matches the ASCII/Latin-1 character corresponding to the octal number ooo (between 0 and 0377). \row \i <b>. (dot)</b> \i This matches any character (including newline). \row \i <b>\\d</b> - \i This matches a digit (see QChar::isDigit()). + \i This matches a digit (QChar::isDigit()). \row \i <b>\\D</b> \i This matches a non-digit. \row \i <b>\\s</b> - \i This matches a whitespace (see QChar::isSpace()). + \i This matches a whitespace (QChar::isSpace()). \row \i <b>\\S</b> \i This matches a non-whitespace. \row \i <b>\\w</b> - \i This matches a word character (see QChar::isLetterOrNumber()). + \i This matches a word character (QChar::isLetterOrNumber() or '_'). \row \i <b>\\W</b> \i This matches a non-word character. \row \i <b>\\n</b> \i The n-th \link #capturing-text backreference \endlink, e.g. \1, \2, etc. \endtable \e {Note that the C++ compiler transforms backslashes in strings so to include a <b>\\</b> in a regexp you will need to enter it twice, i.e. <b>\\\\</b>.} \target sets-of-characters \section1 Sets of Characters Square brackets are used to match any character in the set of characters contained within the square brackets. All the character set abbreviations described above can be used within square brackets. Apart from the character set abbreviations and the following two exceptions no characters have special meanings in square brackets. \table \row \i <b>^</b> \i The caret negates the character set if it occurs as the first character, i.e. immediately after the opening square bracket. For example, <b>[abc]</b> matches 'a' or 'b' or 'c', but <b>[^abc]</b> matches anything \e except 'a' or 'b' or 'c'. \row \i <b>-</b> \i The dash is used to indicate a range of characters, for example <b>[W-Z]</b> matches 'W' or 'X' or 'Y' or 'Z'. \endtable Using the predefined character set abbreviations is more portable than using character ranges across platforms and languages. For example, <b>[0-9]</b> matches a digit in Western alphabets but <b>\d</b> matches a digit in \e any alphabet. Note that in most regexp literature sets of characters are called "character classes". \target quantifiers \section1 Quantifiers By default an expression is automatically quantified by <b>{1,1}</b>, i.e. it should occur exactly once. In the following list <b>\e {E}</b> stands for any expression. An expression is a character or an abbreviation for a set of characters or a set of characters in square brackets or any parenthesised expression. \table \row \i <b>\e {E}?</b> \i Matches zero or one occurrence of \e E. This quantifier means "the previous expression is optional" since it will match whether or not the expression occurs in the string. It is the same as <b>\e {E}{0,1}</b>. For example <b>dents?</b> will match 'dent' and 'dents'. \row \i <b>\e {E}+</b> \i Matches one or more occurrences of \e E. This is the same as <b>\e {E}{1,MAXINT}</b>. For example, <b>0+</b> will match '0', '00', '000', etc. \row \i <b>\e {E}*</b> \i Matches zero or more occurrences of \e E. This is the same as <b>\e {E}{0,MAXINT}</b>. The <b>*</b> quantifier is often used by a mistake. Since it matches \e zero or more occurrences it will match no occurrences at all. For example if we want to match strings that end in whitespace and use the regexp <b>\s*$</b> we would get a match on every string. This is because we have said find zero or more whitespace followed by the end of string, so even strings that don't end in whitespace will match. The regexp we want in this case is <b>\s+$</b> to match strings that have at least one whitespace at the end. \row \i <b>\e {E}{n}</b> \i Matches exactly \e n occurrences of the expression. This is the same as repeating the expression \e n times. For example, <b>x{5}</b> is the same as <b>xxxxx</b>. It is also the same as <b>\e {E}{n,n}</b>, e.g. <b>x{5,5}</b>. \row \i <b>\e {E}{n,}</b> \i Matches at least \e n occurrences of the expression. This is the same as <b>\e {E}{n,MAXINT}</b>. \row \i <b>\e {E}{,m}</b> \i Matches at most \e m occurrences of the expression. This is the same as <b>\e {E}{0,m}</b>. \row \i <b>\e {E}{n,m}</b> \i Matches at least \e n occurrences of the expression and at most \e m occurrences of the expression. \endtable (MAXINT is implementation dependent but will not be smaller than 1024.) If we wish to apply a quantifier to more than just the preceding character we can use parentheses to group characters together in an expression. For example, <b>tag+</b> matches a 't' followed by an 'a' followed by at least one 'g', whereas <b>(tag)+</b> matches at least one occurrence of 'tag'. Note that quantifiers are "greedy". They will match as much text as they can. For example, <b>0+</b> will match as many zeros as it can from the first zero it finds, e.g. '2.<u>000</u>5'. Quantifiers can be made non-greedy, see setMinimal(). \target capturing-text \section1 Capturing Text Parentheses allow us to group elements together so that we can quantify and capture them. For example if we have the expression <b>mail|letter|correspondence</b> that matches a string we know that \e one of the words matched but not which one. Using parentheses allows us to "capture" whatever is matched within their bounds, so if we used <b>(mail|letter|correspondence)</b> and matched this regexp against the string "I sent you some email" we can use the cap() or capturedTexts() functions to extract the matched characters, in this case 'mail'. We can use captured text within the regexp itself. To refer to the captured text we use \e backreferences which are indexed from 1, the same as for cap(). For example we could search for duplicate words in a string using <b>\b(\w+)\W+\1\b</b> which means match a word boundary followed by one or more word characters followed by one or more non-word characters followed by the same text as the first parenthesised expression followed by a word boundary. If we want to use parentheses purely for grouping and not for capturing we can use the non-capturing syntax, e.g. <b>(?:green|blue)</b>. Non-capturing parentheses begin '(?:' and end ')'. In this example we match either 'green' or 'blue' but we do not capture the match so we only know whether or not we matched but not which color we actually found. Using non-capturing parentheses is more efficient than using capturing parentheses since the regexp engine has to do less book-keeping. Both capturing and non-capturing parentheses may be nested. \target assertions \section1 Assertions Assertions make some statement about the text at the point where they occur in the regexp but they do not match any characters. In the following list <b>\e {E}</b> stands for any expression. \table \row \i <b>^</b> \i The caret signifies the beginning of the string. If you wish to match a literal \c{^} you must escape it by writing \c{\\^}. For example, <b>^#include</b> will only match strings which \e begin with the characters '#include'. (When the caret is the first character of a character set it has a special meaning, see \link #sets-of-characters Sets of Characters \endlink.) \row \i <b>$</b> \i The dollar signifies the end of the string. For example <b>\d\s*$</b> will match strings which end with a digit optionally followed by whitespace. If you wish to match a literal \c{$} you must escape it by writing \c{\\$}. \row \i <b>\\b</b> \i A word boundary. For example the regexp <b>\\bOK\\b</b> means match immediately after a word boundary (e.g. start of string or whitespace) the letter 'O' then the letter 'K' immediately before another word boundary (e.g. end of string or whitespace). But note that the assertion does not actually match any whitespace so if we write <b>(\\bOK\\b)</b> and we have a match it will only contain 'OK' even if the string is "Its <u>OK</u> now". \row \i <b>\\B</b> \i A non-word boundary. This assertion is true wherever <b>\\b</b> is false. For example if we searched for <b>\\Bon\\B</b> in "Left on" the match would fail (space and end of string aren't non-word boundaries), but it would match in "t<u>on</u>ne". \row \i <b>(?=\e E)</b> \i Positive lookahead. This assertion is true if the expression matches at this point in the regexp. For example, <b>const(?=\\s+char)</b> matches 'const' whenever it is followed by 'char', as in 'static <u>const</u> char *'. (Compare with <b>const\\s+char</b>, which matches 'static <u>const char</u> *'.) \row \i <b>(?!\e E)</b> \i Negative lookahead. This assertion is true if the expression does not match at this point in the regexp. For example, <b>const(?!\\s+char)</b> matches 'const' \e except when it is followed by 'char'. \endtable \target wildcard-matching \section1 Wildcard Matching (globbing) Most command shells such as \e bash or \e cmd.exe support "file globbing", the ability to identify a group of files by using wildcards. The setWildcard() function is used to switch between regexp and wildcard mode. Wildcard matching is much simpler than full regexps and has only four features: \table \row \i <b>c</b> \i Any character represents itself apart from those mentioned below. Thus <b>c</b> matches the character \e c. \row \i <b>?</b> \i This matches any single character. It is the same as <b>.</b> in full regexps. \row \i <b>*</b> \i This matches zero or more of any characters. It is the same as <b>.*</b> in full regexps. \row \i <b>[...]</b> \i Sets of characters can be represented in square brackets, similar to full regexps. Within the character class, like outside, backslash has no special meaning. \endtable For example if we are in wildcard mode and have strings which contain filenames we could identify HTML files with <b>*.html</b>. This will match zero or more characters followed by a dot followed by 'h', 't', 'm' and 'l'. \target perl-users \section1 Notes for Perl Users Most of the character class abbreviations supported by Perl are supported by QRegExp, see \link #characters-and-abbreviations-for-sets-of-characters characters and abbreviations for sets of characters \endlink. In QRegExp, apart from within character classes, \c{^} always signifies the start of the string, so carets must always be escaped unless used for that purpose. In Perl the meaning of caret varies automagically depending on where it occurs so escaping it is rarely necessary. The same applies to \c{$} which in QRegExp always signifies the end of the string. QRegExp's quantifiers are the same as Perl's greedy quantifiers. Non-greedy matching cannot be applied to individual quantifiers, but can be applied to all the quantifiers in the pattern. For example, to match the Perl regexp <b>ro+?m</b> requires: \code QRegExp rx( "ro+m" ); rx.setMinimal( TRUE ); \endcode The equivalent of Perl's \c{/i} option is setCaseSensitive(FALSE). Perl's \c{/g} option can be emulated using a \link #cap_in_a_loop loop \endlink. In QRegExp <b>.</b> matches any character, therefore all QRegExp regexps have the equivalent of Perl's \c{/s} option. QRegExp does not have an equivalent to Perl's \c{/m} option, but this can be emulated in various ways for example by splitting the input into lines or by looping with a regexp that searches for newlines. Because QRegExp is string oriented there are no \A, \Z or \z assertions. The \G assertion is not supported but can be emulated in a loop. Perl's $& is cap(0) or capturedTexts()[0]. There are no QRegExp equivalents for $`, $' or $+. Perl's capturing variables, $1, $2, ... correspond to cap(1) or capturedTexts()[1], cap(2) or capturedTexts()[2], etc. To substitute a pattern use QString::replace(). Perl's extended \c{/x} syntax is not supported, nor are - regexp comments (?#comment) or directives, e.g. (?i). + directives, e.g. (?i), or regexp comments, e.g. (?#comment). On + the other hand, C++'s rules for literal strings can be used to + achieve the same: + \code + QRegExp mark( "\\b" // word boundary + "[Mm]ark" // the word we want to match + ); + \endcode Both zero-width positive and zero-width negative lookahead assertions (?=pattern) and (?!pattern) are supported with the same syntax as Perl. Perl's lookbehind assertions, "independent" subexpressions and conditional expressions are not supported. Non-capturing parentheses are also supported, with the same (?:pattern) syntax. See QStringList::split() and QStringList::join() for equivalents to Perl's split and join functions. Note: because C++ transforms \\'s they must be written \e twice in code, e.g. <b>\\b</b> must be written <b>\\\\b</b>. \target code-examples \section1 Code Examples \code QRegExp rx( "^\\d\\d?$" ); // match integers 0 to 99 rx.search( "123" ); // returns -1 (no match) rx.search( "-6" ); // returns -1 (no match) rx.search( "6" ); // returns 0 (matched as position 0) \endcode The third string matches '<u>6</u>'. This is a simple validation regexp for integers in the range 0 to 99. \code QRegExp rx( "^\\S+$" ); // match strings without whitespace rx.search( "Hello world" ); // returns -1 (no match) rx.search( "This_is-OK" ); // returns 0 (matched at position 0) \endcode The second string matches '<u>This_is-OK</u>'. We've used the character set abbreviation '\S' (non-whitespace) and the anchors to match strings which contain no whitespace. In the following example we match strings containing 'mail' or 'letter' or 'correspondence' but only match whole words i.e. not 'email' \code QRegExp rx( "\\b(mail|letter|correspondence)\\b" ); rx.search( "I sent you an email" ); // returns -1 (no match) rx.search( "Please write the letter" ); // returns 17 \endcode The second string matches "Please write the <u>letter</u>". The word 'letter' is also captured (because of the parentheses). We can see what text we've captured like this: \code QString captured = rx.cap( 1 ); // captured == "letter" \endcode This will capture the text from the first set of capturing parentheses (counting capturing left parentheses from left to right). The parentheses are counted from 1 since cap( 0 ) is the whole matched regexp (equivalent to '&' in most regexp engines). \code QRegExp rx( "&(?!amp;)" ); // match ampersands but not & QString line1 = "This & that"; line1.replace( rx, "&" ); // line1 == "This & that" QString line2 = "His & hers & theirs"; line2.replace( rx, "&" ); // line2 == "His & hers & theirs" \endcode Here we've passed the QRegExp to QString's replace() function to replace the matched text with new text. \code QString str = "One Eric another Eirik, and an Ericsson." " How many Eiriks, Eric?"; QRegExp rx( "\\b(Eric|Eirik)\\b" ); // match Eric or Eirik int pos = 0; // where we are in the string int count = 0; // how many Eric and Eirik's we've counted while ( pos >= 0 ) { pos = rx.search( str, pos ); if ( pos >= 0 ) { pos++; // move along in str count++; // count our Eric or Eirik } } \endcode We've used the search() function to repeatedly match the regexp in the string. Note that instead of moving forward by one character at a time \c pos++ we could have written \c {pos += rx.matchedLength()} to skip over the already matched string. The count will equal 3, matching 'One <u>Eric</u> another <u>Eirik</u>, and an Ericsson. How many Eiriks, <u>Eric</u>?'; it doesn't match 'Ericsson' or 'Eiriks' because they are not bounded by non-word boundaries. One common use of regexps is to split lines of delimited data into their component fields. \code str = "Trolltech AS\twww.trolltech.com\tNorway"; QString company, web, country; rx.setPattern( "^([^\t]+)\t([^\t]+)\t([^\t]+)$" ); if ( rx.search( str ) != -1 ) { company = rx.cap( 1 ); web = rx.cap( 2 ); country = rx.cap( 3 ); } \endcode In this example our input lines have the format company name, web address and country. Unfortunately the regexp is rather long and not very versatile -- the code will break if we add any more fields. A simpler and better solution is to look for the separator, '\t' in this case, and take the surrounding text. The QStringList split() function can take a separator string or regexp as an argument and split a string accordingly. \code QStringList field = QStringList::split( "\t", str ); \endcode Here field[0] is the company, field[1] the web address and so on. To imitate the matching of a shell we can use wildcard mode. \code - QRegExp rx( "*.html" ); // invalid regexp: * doesn't quantify anything - rx.setWildcard( TRUE ); // now it's a valid wildcard regexp - rx.search( "index.html" ); // returns 0 (matched at position 0) - rx.search( "default.htm" ); // returns -1 (no match) - rx.search( "readme.txt" ); // returns -1 (no match) + QRegExp rx( "*.html" ); // invalid regexp: * doesn't quantify anything + rx.setWildcard( TRUE ); // now it's a valid wildcard regexp + rx.exactMatch( "index.html" ); // returns TRUE + rx.exactMatch( "default.htm" ); // returns FALSE + rx.exactMatch( "readme.txt" ); // returns FALSE \endcode Wildcard matching can be convenient because of its simplicity, but any wildcard regexp can be defined using full regexps, e.g. <b>.*\.html$</b>. Notice that we can't match both \c .html and \c .htm files with a wildcard unless we use <b>*.htm*</b> which will also match 'test.html.bak'. A full regexp gives us the precision we need, <b>.*\\.html?$</b>. QRegExp can match case insensitively using setCaseSensitive(), and can use non-greedy matching, see setMinimal(). By default QRegExp uses full regexps but this can be changed with setWildcard(). Searching can be forward with search() or backward with searchRev(). Captured text can be accessed using capturedTexts() which returns a string list of all captured strings, or using cap() which returns the captured string for the given index. The pos() function takes a match index and returns the position in the string where the match was made (or -1 if there was no match). \sa QRegExpValidator QString QStringList \target member-function-documentation */ const int NumBadChars = 64; #define BadChar( ch ) ( (ch).unicode() % NumBadChars ) const int NoOccurrence = INT_MAX; const int EmptyCapture = INT_MAX; const int InftyLen = INT_MAX; const int InftyRep = 1025; const int EOS = -1; +static bool isWord( QChar ch ) +{ + return ch.isLetterOrNumber() || ch == QChar( '_' ); +} + /* Merges two QMemArrays of ints and puts the result into the first one. */ static void mergeInto( QMemArray<int> *a, const QMemArray<int>& b ) { int asize = a->size(); int bsize = b.size(); if ( asize == 0 ) { *a = b.copy(); #ifndef QT_NO_REGEXP_OPTIM } else if ( bsize == 1 && (*a)[asize - 1] < b[0] ) { a->resize( asize + 1 ); (*a)[asize] = b[0]; #endif } else if ( bsize >= 1 ) { int csize = asize + bsize; QMemArray<int> c( csize ); int i = 0, j = 0, k = 0; while ( i < asize ) { if ( j < bsize ) { if ( (*a)[i] == b[j] ) { i++; csize--; } else if ( (*a)[i] < b[j] ) { c[k++] = (*a)[i++]; } else { c[k++] = b[j++]; } } else { memcpy( c.data() + k, (*a).data() + i, (asize - i) * sizeof(int) ); break; } } c.resize( csize ); if ( j < bsize ) memcpy( c.data() + k, b.data() + j, (bsize - j) * sizeof(int) ); *a = c; } } /* Merges two disjoint QMaps of (int, int) pairs and puts the result into the first one. */ static void mergeInto( QMap<int, int> *a, const QMap<int, int>& b ) { QMap<int, int>::ConstIterator it; for ( it = b.begin(); it != b.end(); ++it ) a->insert( it.key(), *it ); } /* Returns the value associated to key k in QMap m of (int, int) pairs, or 0 if no such value is explicitly present. */ static int at( const QMap<int, int>& m, int k ) { QMap<int, int>::ConstIterator it = m.find( k ); if ( it == m.end() ) return 0; else return *it; } #ifndef QT_NO_REGEXP_WILDCARD /* Translates a wildcard pattern to an equivalent regular expression pattern (e.g., *.cpp to .*\.cpp). */ static QString wc2rx( const QString& wc_str ) { int wclen = wc_str.length(); QString rx = QString::fromLatin1( "" ); int i = 0; const QChar *wc = wc_str.unicode(); while ( i < wclen ) { QChar c = wc[i++]; switch ( c.unicode() ) { case '*': rx += QString::fromLatin1( ".*" ); break; case '?': rx += QChar( '.' ); break; case '$': case '(': case ')': case '+': case '.': case '\\': case '^': case '{': case '|': case '}': rx += QChar( '\\' ); rx += c; break; case '[': rx += c; if ( wc[i] == QChar('^') ) rx += wc[i++]; if ( i < wclen ) { if ( rx[i] == ']' ) rx += wc[i++]; while ( i < wclen && wc[i] != QChar(']') ) { if ( wc[i] == '\\' ) rx += QChar( '\\' ); rx += wc[i++]; } } break; default: rx += c; } } return rx; } #endif /* The class QRegExpEngine encapsulates a modified nondeterministic finite automaton (NFA). */ class QRegExpEngine : public QShared { public: #ifndef QT_NO_REGEXP_CCLASS /* The class CharClass represents a set of characters, such as can be found in regular expressions (e.g., [a-z] denotes the set {a, b, ..., z}). */ class CharClass { public: CharClass(); CharClass( const CharClass& cc ) { operator=( cc ); } CharClass& operator=( const CharClass& cc ); void clear(); bool negative() const { return n; } void setNegative( bool negative ); void addCategories( int cats ); void addRange( ushort from, ushort to ); void addSingleton( ushort ch ) { addRange( ch, ch ); } bool in( QChar ch ) const; #ifndef QT_NO_REGEXP_OPTIM const QMemArray<int>& firstOccurrence() const { return occ1; } #endif #if defined(QT_DEBUG) void dump() const; #endif private: /* The struct Range represents a range of characters (e.g., [0-9] denotes range 48 to 57). */ struct Range { ushort from; // 48 ushort to; // 57 }; int c; // character classes QMemArray<Range> r; // character ranges bool n; // negative? #ifndef QT_NO_REGEXP_OPTIM QMemArray<int> occ1; // first-occurrence array #endif }; #else struct CharClass { int dummy; #ifndef QT_NO_REGEXP_OPTIM CharClass() { occ1.fill( 0, NumBadChars ); } const QMemArray<int>& firstOccurrence() const { return occ1; } QMemArray<int> occ1; #endif }; #endif QRegExpEngine( bool caseSensitive ) { setup( caseSensitive ); } QRegExpEngine( const QString& rx, bool caseSensitive ); #ifndef QT_NO_REGEXP_OPTIM @@ -1491,387 +1503,387 @@ void QRegExpEngine::heuristicallyChooseHeuristic() int step = QMAX( 1, NumBadChars / 32 ); for ( i = 1; i < NumBadChars; i += step ) { if ( occ1[i] == NoOccurrence ) badCharScore += minl; else badCharScore += occ1[i]; } badCharScore /= minl; useGoodStringHeuristic = ( goodStringScore > badCharScore ); } #endif #if defined(QT_DEBUG) void QRegExpEngine::dump() const { int i, j; qDebug( "Case %ssensitive engine", cs ? "" : "in" ); qDebug( " States" ); for ( i = 0; i < ns; i++ ) { qDebug( " %d%s", i, i == InitialState ? " (initial)" : i == FinalState ? " (final)" : "" ); #ifndef QT_NO_REGEXP_CAPTURE qDebug( " in atom %d", s[i]->atom ); #endif int m = s[i]->match; if ( (m & CharClassBit) != 0 ) { qDebug( " match character class %d", m ^ CharClassBit ); #ifndef QT_NO_REGEXP_CCLASS cl[m ^ CharClassBit]->dump(); #else qDebug( " negative character class" ); #endif } else if ( (m & BackRefBit) != 0 ) { qDebug( " match back-reference %d", m ^ BackRefBit ); } else if ( m >= 0x20 && m <= 0x7e ) { qDebug( " match 0x%.4x (%c)", m, m ); } else { qDebug( " match 0x%.4x", m ); } for ( j = 0; j < (int) s[i]->outs.size(); j++ ) { int next = s[i]->outs[j]; qDebug( " -> %d", next ); if ( s[i]->reenter != 0 && s[i]->reenter->contains(next) ) qDebug( " [reenter %d]", (*s[i]->reenter)[next] ); if ( s[i]->anchors != 0 && at(*s[i]->anchors, next) != 0 ) qDebug( " [anchors 0x%.8x]", (*s[i]->anchors)[next] ); } } #ifndef QT_NO_REGEXP_CAPTURE if ( nf > 0 ) { qDebug( " Atom Parent Capture" ); for ( i = 0; i < nf; i++ ) qDebug( " %6d %6d %6d", i, f[i].parent, f[i].capture ); } #endif #ifndef QT_NO_REGEXP_ANCHOR_ALT for ( i = 0; i < (int) aa.size(); i++ ) qDebug( " Anchor alternation 0x%.8x: 0x%.8x 0x%.9x", i, aa[i].a, aa[i].b ); #endif } #endif void QRegExpEngine::setup( bool caseSensitive ) { s.setAutoDelete( TRUE ); s.resize( 32 ); ns = 0; #ifndef QT_NO_REGEXP_CAPTURE f.resize( 32 ); nf = 0; cf = -1; #endif officialncap = 0; ncap = 0; #ifndef QT_NO_REGEXP_CCLASS cl.setAutoDelete( TRUE ); #endif #ifndef QT_NO_REGEXP_LOOKAHEAD ahead.setAutoDelete( TRUE ); #endif #ifndef QT_NO_REGEXP_OPTIM caretAnchored = TRUE; #endif valid = FALSE; cs = caseSensitive; #ifndef QT_NO_REGEXP_BACKREF nbrefs = 0; #endif #ifndef QT_NO_REGEXP_OPTIM useGoodStringHeuristic = FALSE; minl = 0; occ1.fill( 0, NumBadChars ); #endif mmCapturedNoMatch.fill( -1, 2 ); } int QRegExpEngine::setupState( int match ) { if ( (ns & (ns + 1)) == 0 && ns + 1 >= (int) s.size() ) s.resize( (ns + 1) << 1 ); #ifndef QT_NO_REGEXP_CAPTURE s.insert( ns, new State(cf, match) ); #else s.insert( ns, new State(match) ); #endif return ns++; } #ifndef QT_NO_REGEXP_CAPTURE /* Functions startAtom() and finishAtom() should be called to delimit atoms. When a state is created, it is assigned to the current atom. The information is later used for capturing. */ int QRegExpEngine::startAtom( bool capture ) { if ( (nf & (nf + 1)) == 0 && nf + 1 >= (int) f.size() ) f.resize( (nf + 1) << 1 ); f[nf].parent = cf; cf = nf++; f[cf].capture = capture ? ncap++ : -1; return cf; } #endif #ifndef QT_NO_REGEXP_LOOKAHEAD /* Creates a lookahead anchor. */ int QRegExpEngine::addLookahead( QRegExpEngine *eng, bool negative ) { int n = ahead.size(); if ( n == MaxLookaheads ) { error( RXERR_LIMIT ); return 0; } ahead.resize( n + 1 ); ahead.insert( n, new Lookahead(eng, negative) ); return Anchor_FirstLookahead << n; } #endif #ifndef QT_NO_REGEXP_CAPTURE /* We want the longest leftmost captures. */ bool QRegExpEngine::isBetterCapture( const int *begin1, const int *end1, const int *begin2, const int *end2 ) { for ( int i = 0; i < ncap; i++ ) { int delta = begin2[i] - begin1[i]; // it has to start early... if ( delta == 0 ) delta = end1[i] - end2[i]; // ...and end late (like a party) if ( delta != 0 ) return delta > 0; } return FALSE; } #endif /* Returns TRUE if anchor a matches at position mmPos + i in the input string, otherwise FALSE. */ bool QRegExpEngine::testAnchor( int i, int a, const int *capBegin ) { int j; #ifndef QT_NO_REGEXP_ANCHOR_ALT if ( (a & Anchor_Alternation) != 0 ) { return testAnchor( i, aa[a ^ Anchor_Alternation].a, capBegin ) || testAnchor( i, aa[a ^ Anchor_Alternation].b, capBegin ); } #endif if ( (a & Anchor_Caret) != 0 ) { if ( mmPos + i != mmCaretPos ) return FALSE; } if ( (a & Anchor_Dollar) != 0 ) { if ( mmPos + i != mmLen ) return FALSE; } #ifndef QT_NO_REGEXP_ESCAPE if ( (a & (Anchor_Word | Anchor_NonWord)) != 0 ) { bool before = FALSE; bool after = FALSE; if ( mmPos + i != 0 ) - before = mmIn[mmPos + i - 1].isLetterOrNumber(); + before = isWord( mmIn[mmPos + i - 1] ); if ( mmPos + i != mmLen ) - after = mmIn[mmPos + i].isLetterOrNumber(); + after = isWord( mmIn[mmPos + i] ); if ( (a & Anchor_Word) != 0 && (before == after) ) return FALSE; if ( (a & Anchor_NonWord) != 0 && (before != after) ) return FALSE; } #endif #ifndef QT_NO_REGEXP_LOOKAHEAD bool catchx = TRUE; if ( (a & Anchor_LookaheadMask) != 0 ) { QConstString cstr = QConstString( (QChar *) mmIn + mmPos + i, mmLen - mmPos - i ); for ( j = 0; j < (int) ahead.size(); j++ ) { if ( (a & (Anchor_FirstLookahead << j)) != 0 ) { catchx = ahead[j]->eng->match( cstr.string(), 0, TRUE, TRUE, mmCaretPos - mmPos - i )[0] == 0; if ( catchx == ahead[j]->neg ) return FALSE; } } } #endif #ifndef QT_NO_REGEXP_CAPTURE #ifndef QT_NO_REGEXP_BACKREF for ( j = 0; j < nbrefs; j++ ) { if ( (a & (Anchor_BackRef1Empty << j)) != 0 ) { if ( capBegin[j] != EmptyCapture ) return FALSE; } } #endif #endif return TRUE; } #ifndef QT_NO_REGEXP_OPTIM /* The three following functions are what Jeffrey Friedl would call transmissions (or bump-alongs). Using one or the other should make no difference except in performance. */ bool QRegExpEngine::goodStringMatch() { int k = mmPos + goodEarlyStart; while ( (k = mmStr->find(goodStr, k, cs)) != -1 ) { int from = k - goodLateStart; int to = k - goodEarlyStart; if ( from > mmPos ) mmPos = from; while ( mmPos <= to ) { if ( matchHere() ) return TRUE; mmPos++; } k++; } return FALSE; } bool QRegExpEngine::badCharMatch() { int slideHead = 0; int slideNext = 0; int i; int lastPos = mmLen - minl; memset( mmSlideTab, 0, mmSlideTabSize * sizeof(int) ); /* Set up the slide table, used for the bad-character heuristic, using the table of first occurrence of each character. */ for ( i = 0; i < minl; i++ ) { int sk = occ1[BadChar(mmIn[mmPos + i])]; if ( sk == NoOccurrence ) sk = i + 1; if ( sk > 0 ) { int k = i + 1 - sk; if ( k < 0 ) { sk = i + 1; k = 0; } if ( sk > mmSlideTab[k] ) mmSlideTab[k] = sk; } } if ( mmPos > lastPos ) return FALSE; for ( ;; ) { if ( ++slideNext >= mmSlideTabSize ) slideNext = 0; if ( mmSlideTab[slideHead] > 0 ) { if ( mmSlideTab[slideHead] - 1 > mmSlideTab[slideNext] ) mmSlideTab[slideNext] = mmSlideTab[slideHead] - 1; mmSlideTab[slideHead] = 0; } else { if ( matchHere() ) return TRUE; } if ( mmPos == lastPos ) break; /* Update the slide table. This code has much in common with the initialization code. */ int sk = occ1[BadChar(mmIn[mmPos + minl])]; if ( sk == NoOccurrence ) { mmSlideTab[slideNext] = minl; } else if ( sk > 0 ) { int k = slideNext + minl - sk; if ( k >= mmSlideTabSize ) k -= mmSlideTabSize; if ( sk > mmSlideTab[k] ) mmSlideTab[k] = sk; } slideHead = slideNext; mmPos++; } return FALSE; } #else bool QRegExpEngine::bruteMatch() { while ( mmPos <= mmLen ) { if ( matchHere() ) return TRUE; mmPos++; } return FALSE; } #endif /* Here's the core of the engine. It tries to do a match here and now. */ bool QRegExpEngine::matchHere() { int ncur = 1, nnext = 0; int i = 0, j, k, m; bool stop = FALSE; mmMatchLen = -1; mmMatchedLen = -1; mmCurStack[0] = InitialState; #ifndef QT_NO_REGEXP_CAPTURE if ( ncap > 0 ) { for ( j = 0; j < ncap; j++ ) { mmCurCapBegin[j] = EmptyCapture; mmCurCapEnd[j] = EmptyCapture; } } #endif #ifndef QT_NO_REGEXP_BACKREF int *zzZ = 0; while ( (ncur > 0 || !mmSleeping.isEmpty()) && i <= mmLen - mmPos && !stop ) #else while ( ncur > 0 && i <= mmLen - mmPos && !stop ) #endif { int ch = ( i < mmLen - mmPos ) ? mmIn[mmPos + i].unicode() : 0; for ( j = 0; j < ncur; j++ ) { int cur = mmCurStack[j]; State *scur = s[cur]; QMemArray<int>& outs = scur->outs; for ( k = 0; k < (int) outs.size(); k++ ) { int next = outs[k]; State *snext = s[next]; bool in = TRUE; #ifndef QT_NO_REGEXP_BACKREF int needSomeSleep = 0; #endif /* First, check if the anchors are anchored properly. */ if ( scur->anchors != 0 ) { int a = at( *scur->anchors, next ); if ( a != 0 && !testAnchor(i, a, mmCurCapBegin + j * ncap) ) in = FALSE; } /* If indeed they are, check if the input character is @@ -2443,404 +2455,412 @@ void QRegExpEngine::Box::cat( const Box& b ) void QRegExpEngine::Box::orx( const Box& b ) { mergeInto( &ls, b.ls ); mergeInto( &lanchors, b.lanchors ); mergeInto( &rs, b.rs ); mergeInto( &ranchors, b.ranchors ); if ( b.minl == 0 ) { if ( minl == 0 ) skipanchors = eng->anchorAlternation( skipanchors, b.skipanchors ); else skipanchors = b.skipanchors; } #ifndef QT_NO_REGEXP_OPTIM occ1.detach(); for ( int i = 0; i < NumBadChars; i++ ) { if ( occ1[i] > b.occ1[i] ) occ1[i] = b.occ1[i]; } earlyStart = 0; lateStart = 0; str = QString(); leftStr = QString(); rightStr = QString(); if ( b.maxl > maxl ) maxl = b.maxl; #endif if ( b.minl < minl ) minl = b.minl; } void QRegExpEngine::Box::plus( int atom ) { #ifndef QT_NO_REGEXP_CAPTURE eng->addPlusTransitions( rs, ls, atom ); #else Q_UNUSED( atom ); eng->addCatTransitions( rs, ls ); #endif addAnchorsToEngine( *this ); #ifndef QT_NO_REGEXP_OPTIM maxl = InftyLen; #endif } void QRegExpEngine::Box::opt() { #ifndef QT_NO_REGEXP_OPTIM earlyStart = 0; lateStart = 0; str = QString(); leftStr = QString(); rightStr = QString(); #endif skipanchors = 0; minl = 0; } void QRegExpEngine::Box::catAnchor( int a ) { if ( a != 0 ) { for ( int i = 0; i < (int) rs.size(); i++ ) { a = eng->anchorConcatenation( at(ranchors, rs[i]), a ); ranchors.insert( rs[i], a ); } if ( minl == 0 ) skipanchors = eng->anchorConcatenation( skipanchors, a ); } } #ifndef QT_NO_REGEXP_OPTIM void QRegExpEngine::Box::setupHeuristics() { eng->setupGoodStringHeuristic( earlyStart, lateStart, str ); /* A regular expression such as 112|1 has occ1['2'] = 2 and minl = 1 at this point. An entry of occ1 has to be at most minl or infinity for the rest of the algorithm to go well. We waited until here before normalizing these cases (instead of doing it in Box::orx()) because sometimes things improve by themselves. Consider for example (112|1)34. */ for ( int i = 0; i < NumBadChars; i++ ) { if ( occ1[i] != NoOccurrence && occ1[i] >= minl ) occ1[i] = minl; } eng->setupBadCharHeuristic( minl, occ1 ); eng->heuristicallyChooseHeuristic(); } #endif #if defined(QT_DEBUG) void QRegExpEngine::Box::dump() const { int i; qDebug( "Box of at least %d character%s", minl, minl == 1 ? "" : "s" ); qDebug( " Left states:" ); for ( i = 0; i < (int) ls.size(); i++ ) { if ( at(lanchors, ls[i]) == 0 ) qDebug( " %d", ls[i] ); else qDebug( " %d [anchors 0x%.8x]", ls[i], lanchors[ls[i]] ); } qDebug( " Right states:" ); for ( i = 0; i < (int) rs.size(); i++ ) { if ( at(ranchors, rs[i]) == 0 ) qDebug( " %d", rs[i] ); else qDebug( " %d [anchors 0x%.8x]", rs[i], ranchors[rs[i]] ); } qDebug( " Skip anchors: 0x%.8x", skipanchors ); } #endif void QRegExpEngine::Box::addAnchorsToEngine( const Box& to ) const { for ( int i = 0; i < (int) to.ls.size(); i++ ) { for ( int j = 0; j < (int) rs.size(); j++ ) { int a = eng->anchorConcatenation( at(ranchors, rs[j]), at(to.lanchors, to.ls[i]) ); eng->addAnchors( rs[j], to.ls[i], a ); } } } int QRegExpEngine::getChar() { return ( yyPos == yyLen ) ? EOS : yyIn[yyPos++].unicode(); } int QRegExpEngine::getEscape() { #ifndef QT_NO_REGEXP_ESCAPE const char tab[] = "afnrtv"; // no b, as \b means word boundary const char backTab[] = "\a\f\n\r\t\v"; ushort low; int i; #endif ushort val; int prevCh = yyCh; if ( prevCh == EOS ) { error( RXERR_END ); return Tok_Char | '\\'; } yyCh = getChar(); #ifndef QT_NO_REGEXP_ESCAPE if ( (prevCh & ~0xff) == 0 ) { const char *p = strchr( tab, prevCh ); if ( p != 0 ) return Tok_Char | backTab[p - tab]; } #endif switch ( prevCh ) { #ifndef QT_NO_REGEXP_ESCAPE case '0': val = 0; for ( i = 0; i < 3; i++ ) { if ( yyCh >= '0' && yyCh <= '7' ) val = ( val << 3 ) | ( yyCh - '0' ); else break; yyCh = getChar(); } if ( (val & ~0377) != 0 ) error( RXERR_OCTAL ); return Tok_Char | val; #endif #ifndef QT_NO_REGEXP_ESCAPE case 'B': return Tok_NonWord; #endif #ifndef QT_NO_REGEXP_CCLASS case 'D': // see QChar::isDigit() yyCharClass->addCategories( 0x7fffffef ); return Tok_CharClass; case 'S': // see QChar::isSpace() yyCharClass->addCategories( 0x7ffff87f ); yyCharClass->addRange( 0x0000, 0x0008 ); yyCharClass->addRange( 0x000e, 0x001f ); yyCharClass->addRange( 0x007f, 0x009f ); return Tok_CharClass; case 'W': // see QChar::isLetterOrNumber() - yyCharClass->addCategories( 0x7ff07f8f ); + yyCharClass->addCategories( 0x7fe07f8f ); + yyCharClass->addRange( 0x203f, 0x2040 ); + yyCharClass->addSingleton( 0x2040 ); + yyCharClass->addSingleton( 0x30fb ); + yyCharClass->addRange( 0xfe33, 0xfe34 ); + yyCharClass->addRange( 0xfe4d, 0xfe4f ); + yyCharClass->addSingleton( 0xff3f ); + yyCharClass->addSingleton( 0xff65 ); return Tok_CharClass; #endif #ifndef QT_NO_REGEXP_ESCAPE case 'b': return Tok_Word; #endif #ifndef QT_NO_REGEXP_CCLASS case 'd': // see QChar::isDigit() yyCharClass->addCategories( 0x00000010 ); return Tok_CharClass; case 's': // see QChar::isSpace() yyCharClass->addCategories( 0x00000380 ); yyCharClass->addRange( 0x0009, 0x000d ); return Tok_CharClass; case 'w': // see QChar::isLetterOrNumber() yyCharClass->addCategories( 0x000f8070 ); + yyCharClass->addSingleton( 0x005f ); // '_' return Tok_CharClass; #endif #ifndef QT_NO_REGEXP_ESCAPE case 'x': val = 0; for ( i = 0; i < 4; i++ ) { low = QChar( yyCh ).lower(); if ( low >= '0' && low <= '9' ) val = ( val << 4 ) | ( low - '0' ); else if ( low >= 'a' && low <= 'f' ) val = ( val << 4 ) | ( low - 'a' + 10 ); else break; yyCh = getChar(); } return Tok_Char | val; #endif default: if ( prevCh >= '1' && prevCh <= '9' ) { #ifndef QT_NO_REGEXP_BACKREF val = prevCh - '0'; while ( yyCh >= '0' && yyCh <= '9' ) { val = ( val *= 10 ) | ( yyCh - '0' ); yyCh = getChar(); } return Tok_BackRef | val; #else error( RXERR_DISABLED ); #endif } return Tok_Char | prevCh; } } #ifndef QT_NO_REGEXP_INTERVAL int QRegExpEngine::getRep( int def ) { if ( yyCh >= '0' && yyCh <= '9' ) { int rep = 0; do { rep = 10 * rep + yyCh - '0'; if ( rep >= InftyRep ) { error( RXERR_REPETITION ); rep = def; } yyCh = getChar(); } while ( yyCh >= '0' && yyCh <= '9' ); return rep; } else { return def; } } #endif #ifndef QT_NO_REGEXP_LOOKAHEAD void QRegExpEngine::skipChars( int n ) { if ( n > 0 ) { yyPos += n - 1; yyCh = getChar(); } } #endif void QRegExpEngine::error( const char *msg ) { if ( yyError.isEmpty() ) yyError = QString::fromLatin1( msg ); } void QRegExpEngine::startTokenizer( const QChar *rx, int len ) { yyIn = rx; yyPos0 = 0; yyPos = 0; yyLen = len; yyCh = getChar(); yyCharClass = new CharClass; yyMinRep = 0; yyMaxRep = 0; yyError = QString(); } int QRegExpEngine::getToken() { #ifndef QT_NO_REGEXP_CCLASS ushort pendingCh = 0; bool charPending; bool rangePending; int tok; #endif int prevCh = yyCh; yyPos0 = yyPos - 1; #ifndef QT_NO_REGEXP_CCLASS yyCharClass->clear(); #endif yyMinRep = 0; yyMaxRep = 0; yyCh = getChar(); switch ( prevCh ) { case EOS: yyPos0 = yyPos; return Tok_Eos; case '$': return Tok_Dollar; case '(': if ( yyCh == '?' ) { prevCh = getChar(); yyCh = getChar(); switch ( prevCh ) { #ifndef QT_NO_REGEXP_LOOKAHEAD case '!': return Tok_NegLookahead; case '=': return Tok_PosLookahead; #endif case ':': return Tok_MagicLeftParen; default: error( RXERR_LOOKAHEAD ); return Tok_MagicLeftParen; } } else { return Tok_LeftParen; } case ')': return Tok_RightParen; case '*': yyMinRep = 0; yyMaxRep = InftyRep; return Tok_Quantifier; case '+': yyMinRep = 1; yyMaxRep = InftyRep; return Tok_Quantifier; case '.': #ifndef QT_NO_REGEXP_CCLASS yyCharClass->setNegative( TRUE ); #endif return Tok_CharClass; case '?': yyMinRep = 0; yyMaxRep = 1; return Tok_Quantifier; case '[': #ifndef QT_NO_REGEXP_CCLASS if ( yyCh == '^' ) { yyCharClass->setNegative( TRUE ); yyCh = getChar(); } charPending = FALSE; rangePending = FALSE; do { if ( yyCh == '-' && charPending && !rangePending ) { rangePending = TRUE; yyCh = getChar(); } else { if ( charPending && !rangePending ) { yyCharClass->addSingleton( pendingCh ); charPending = FALSE; } if ( yyCh == '\\' ) { yyCh = getChar(); tok = getEscape(); if ( tok == Tok_Word ) tok = '\b'; } else { tok = Tok_Char | yyCh; yyCh = getChar(); } if ( tok == Tok_CharClass ) { if ( rangePending ) { yyCharClass->addSingleton( '-' ); yyCharClass->addSingleton( pendingCh ); charPending = FALSE; rangePending = FALSE; } } else if ( (tok & Tok_Char) != 0 ) { if ( rangePending ) { yyCharClass->addRange( pendingCh, tok ^ Tok_Char ); charPending = FALSE; rangePending = FALSE; } else { pendingCh = tok ^ Tok_Char; charPending = TRUE; } } else { error( RXERR_CHARCLASS ); } } } while ( yyCh != ']' && yyCh != EOS ); @@ -2994,896 +3014,884 @@ void QRegExpEngine::parseAtom( Box *box ) int len; #endif switch ( yyTok ) { case Tok_Dollar: box->catAnchor( Anchor_Dollar ); break; case Tok_Caret: box->catAnchor( Anchor_Caret ); break; #ifndef QT_NO_REGEXP_LOOKAHEAD case Tok_PosLookahead: case Tok_NegLookahead: neg = ( yyTok == Tok_NegLookahead ); eng = new QRegExpEngine( cs ); len = eng->parse( yyIn + yyPos - 1, yyLen - yyPos + 1 ); if ( len >= 0 ) skipChars( len ); else error( RXERR_LOOKAHEAD ); box->catAnchor( addLookahead(eng, neg) ); yyTok = getToken(); if ( yyTok != Tok_RightParen ) error( RXERR_LOOKAHEAD ); break; #endif #ifndef QT_NO_REGEXP_ESCAPE case Tok_Word: box->catAnchor( Anchor_Word ); break; case Tok_NonWord: box->catAnchor( Anchor_NonWord ); break; #endif case Tok_LeftParen: case Tok_MagicLeftParen: yyTok = getToken(); parseExpression( box ); if ( yyTok != Tok_RightParen ) error( RXERR_END ); break; case Tok_CharClass: box->set( *yyCharClass ); break; case Tok_Quantifier: error( RXERR_REPETITION ); break; default: if ( (yyTok & Tok_Char) != 0 ) box->set( QChar(yyTok ^ Tok_Char) ); #ifndef QT_NO_REGEXP_BACKREF else if ( (yyTok & Tok_BackRef) != 0 ) box->set( yyTok ^ Tok_BackRef ); #endif else error( RXERR_DISABLED ); } yyTok = getToken(); } void QRegExpEngine::parseFactor( Box *box ) { #ifndef QT_NO_REGEXP_CAPTURE int atom = startAtom( yyMayCapture && yyTok == Tok_LeftParen ); #else static const int atom = 0; #endif #ifndef QT_NO_REGEXP_INTERVAL #define YYREDO() \ yyIn = in, yyPos0 = pos0, yyPos = pos, yyLen = len, yyCh = ch, \ *yyCharClass = charClass, yyMinRep = 0, yyMaxRep = 0, yyTok = tok const QChar *in = yyIn; int pos0 = yyPos0; int pos = yyPos; int len = yyLen; int ch = yyCh; CharClass charClass; if ( yyTok == Tok_CharClass ) charClass = *yyCharClass; int tok = yyTok; bool mayCapture = yyMayCapture; #endif parseAtom( box ); #ifndef QT_NO_REGEXP_CAPTURE finishAtom( atom ); #endif if ( yyTok == Tok_Quantifier ) { if ( yyMaxRep == InftyRep ) { box->plus( atom ); #ifndef QT_NO_REGEXP_INTERVAL } else if ( yyMaxRep == 0 ) { box->clear(); #endif } if ( yyMinRep == 0 ) box->opt(); #ifndef QT_NO_REGEXP_INTERVAL yyMayCapture = FALSE; int alpha = ( yyMinRep == 0 ) ? 0 : yyMinRep - 1; int beta = ( yyMaxRep == InftyRep ) ? 0 : yyMaxRep - ( alpha + 1 ); Box rightBox( this ); int i; for ( i = 0; i < beta; i++ ) { YYREDO(); Box leftBox( this ); parseAtom( &leftBox ); leftBox.cat( rightBox ); leftBox.opt(); rightBox = leftBox; } for ( i = 0; i < alpha; i++ ) { YYREDO(); Box leftBox( this ); parseAtom( &leftBox ); leftBox.cat( rightBox ); rightBox = leftBox; } rightBox.cat( *box ); *box = rightBox; #endif yyTok = getToken(); #ifndef QT_NO_REGEXP_INTERVAL yyMayCapture = mayCapture; #endif } #undef YYREDO } void QRegExpEngine::parseTerm( Box *box ) { #ifndef QT_NO_REGEXP_OPTIM if ( yyTok != Tok_Eos && yyTok != Tok_RightParen && yyTok != Tok_Bar ) parseFactor( box ); #endif while ( yyTok != Tok_Eos && yyTok != Tok_RightParen && yyTok != Tok_Bar ) { Box rightBox( this ); parseFactor( &rightBox ); box->cat( rightBox ); } } void QRegExpEngine::parseExpression( Box *box ) { parseTerm( box ); while ( yyTok == Tok_Bar ) { Box rightBox( this ); yyTok = getToken(); parseTerm( &rightBox ); box->orx( rightBox ); } } /* The struct QRegExpPrivate contains the private data of a regular expression other than the automaton. It makes it possible for many QRegExp objects to use the same QRegExpEngine object with different QRegExpPrivate objects. */ struct QRegExpPrivate { QString pattern; // regular-expression or wildcard pattern QString rxpattern; // regular-expression pattern #ifndef QT_NO_REGEXP_WILDCARD bool wc; // wildcard mode? #endif bool min; // minimal matching? (instead of maximal) #ifndef QT_NO_REGEXP_CAPTURE QString t; // last string passed to QRegExp::search() or searchRev() QStringList capturedCache; // what QRegExp::capturedTexts() returned last #endif QMemArray<int> captured; // what QRegExpEngine::search() returned last QRegExpPrivate() { captured.fill( -1, 2 ); } }; #ifndef QT_NO_REGEXP_OPTIM static QCache<QRegExpEngine> *engineCache = 0; static QSingleCleanupHandler<QCache<QRegExpEngine> > cleanup_cache; #endif static QRegExpEngine *newEngine( const QString& pattern, bool caseSensitive ) { #ifndef QT_NO_REGEXP_OPTIM if ( engineCache != 0 ) { #ifdef QT_THREAD_SUPPORT - QMutexLocker locker( qt_global_mutexpool->get( &engineCache ) ); + QMutexLocker locker( qt_global_mutexpool ? + qt_global_mutexpool->get( &engineCache ) : 0 ); #endif QRegExpEngine *eng = engineCache->take( pattern ); if ( eng == 0 || eng->caseSensitive() != caseSensitive ) { delete eng; } else { eng->ref(); return eng; } } #endif return new QRegExpEngine( pattern, caseSensitive ); } static void derefEngine( QRegExpEngine *eng, const QString& pattern ) { - if ( eng != 0 && eng->deref() ) { -#ifndef QT_NO_REGEXP_OPTIM #ifdef QT_THREAD_SUPPORT - QMutexLocker locker( qt_global_mutexpool->get( &engineCache ) ); + QMutexLocker locker( qt_global_mutexpool ? + qt_global_mutexpool->get( &engineCache ) : 0 ); #endif + if ( eng != 0 && eng->deref() ) { +#ifndef QT_NO_REGEXP_OPTIM if ( engineCache == 0 ) { engineCache = new QCache<QRegExpEngine>; engineCache->setAutoDelete( TRUE ); cleanup_cache.set( &engineCache ); } if ( !pattern.isNull() && engineCache->insert(pattern, eng, 4 + pattern.length() / 4) ) return; #else Q_UNUSED( pattern ); #endif delete eng; } } /*! \enum QRegExp::CaretMode The CaretMode enum defines the different meanings of the caret (<b>^</b>) in a regular expression. The possible values are: \value CaretAtZero The caret corresponds to index 0 in the searched string. \value CaretAtOffset The caret corresponds to the start offset of the search. \value CaretWontMatch The caret never matches. */ /*! Constructs an empty regexp. \sa isValid() errorString() */ QRegExp::QRegExp() { eng = new QRegExpEngine( TRUE ); priv = new QRegExpPrivate; #ifndef QT_NO_REGEXP_WILDCARD priv->wc = FALSE; #endif priv->min = FALSE; compile( TRUE ); } /*! Constructs a regular expression object for the given \a pattern string. The pattern must be given using wildcard notation if \a wildcard is TRUE (default is FALSE). The pattern is case sensitive, unless \a caseSensitive is FALSE. Matching is greedy (maximal), but can be changed by calling setMinimal(). \sa setPattern() setCaseSensitive() setWildcard() setMinimal() */ QRegExp::QRegExp( const QString& pattern, bool caseSensitive, bool wildcard ) { eng = 0; priv = new QRegExpPrivate; priv->pattern = pattern; #ifndef QT_NO_REGEXP_WILDCARD priv->wc = wildcard; #endif priv->min = FALSE; compile( caseSensitive ); } /*! Constructs a regular expression as a copy of \a rx. \sa operator=() */ QRegExp::QRegExp( const QRegExp& rx ) { eng = 0; priv = new QRegExpPrivate; operator=( rx ); } /*! Destroys the regular expression and cleans up its internal data. */ QRegExp::~QRegExp() { derefEngine( eng, priv->rxpattern ); delete priv; } /*! Copies the regular expression \a rx and returns a reference to the copy. The case sensitivity, wildcard and minimal matching options are also copied. */ QRegExp& QRegExp::operator=( const QRegExp& rx ) { rx.eng->ref(); derefEngine( eng, priv->rxpattern ); eng = rx.eng; priv->pattern = rx.priv->pattern; priv->rxpattern = rx.priv->rxpattern; #ifndef QT_NO_REGEXP_WILDCARD priv->wc = rx.priv->wc; #endif priv->min = rx.priv->min; #ifndef QT_NO_REGEXP_CAPTURE priv->t = rx.priv->t; priv->capturedCache = rx.priv->capturedCache; #endif priv->captured = rx.priv->captured; return *this; } /*! Returns TRUE if this regular expression is equal to \a rx; otherwise returns FALSE. Two QRegExp objects are equal if they have the same pattern strings and the same settings for case sensitivity, wildcard and minimal matching. */ bool QRegExp::operator==( const QRegExp& rx ) const { return priv->pattern == rx.priv->pattern && eng->caseSensitive() == rx.eng->caseSensitive() && #ifndef QT_NO_REGEXP_WILDCARD priv->wc == rx.priv->wc && #endif priv->min == rx.priv->min; } /*! \fn bool QRegExp::operator!=( const QRegExp& rx ) const Returns TRUE if this regular expression is not equal to \a rx; otherwise returns FALSE. \sa operator==() */ /*! Returns TRUE if the pattern string is empty; otherwise returns FALSE. If you call exactMatch() with an empty pattern on an empty string it will return TRUE; otherwise it returns FALSE since it operates over the whole string. If you call search() with an empty pattern on \e any string it will return the start offset (0 by default) because the empty pattern matches the 'emptiness' at the start of the string. In this case the length of the match returned by matchedLength() will be 0. See QString::isEmpty(). */ bool QRegExp::isEmpty() const { return priv->pattern.isEmpty(); } /*! Returns TRUE if the regular expression is valid; otherwise returns FALSE. An invalid regular expression never matches. The pattern <b>[a-z</b> is an example of an invalid pattern, since it lacks a closing square bracket. Note that the validity of a regexp may also depend on the setting of the wildcard flag, for example <b>*.html</b> is a valid wildcard regexp but an invalid full regexp. \sa errorString() */ bool QRegExp::isValid() const { return eng->isValid(); } /*! Returns the pattern string of the regular expression. The pattern has either regular expression syntax or wildcard syntax, depending on wildcard(). \sa setPattern() */ QString QRegExp::pattern() const { return priv->pattern; } /*! Sets the pattern string to \a pattern. The case sensitivity, wildcard and minimal matching options are not changed. \sa pattern() */ void QRegExp::setPattern( const QString& pattern ) { if ( priv->pattern != pattern ) { priv->pattern = pattern; compile( caseSensitive() ); } } /*! Returns TRUE if case sensitivity is enabled; otherwise returns FALSE. The default is TRUE. \sa setCaseSensitive() */ bool QRegExp::caseSensitive() const { return eng->caseSensitive(); } /*! Sets case sensitive matching to \a sensitive. If \a sensitive is TRUE, <b>\\.txt$</b> matches \c{readme.txt} but not \c{README.TXT}. \sa caseSensitive() */ void QRegExp::setCaseSensitive( bool sensitive ) { if ( sensitive != eng->caseSensitive() ) compile( sensitive ); } #ifndef QT_NO_REGEXP_WILDCARD /*! Returns TRUE if wildcard mode is enabled; otherwise returns FALSE. The default is FALSE. \sa setWildcard() */ bool QRegExp::wildcard() const { return priv->wc; } /*! Sets the wildcard mode for the regular expression. The default is FALSE. Setting \a wildcard to TRUE enables simple shell-like wildcard matching. (See \link #wildcard-matching wildcard matching (globbing) \endlink.) For example, <b>r*.txt</b> matches the string \c{readme.txt} in wildcard mode, but does not match \c{readme}. \sa wildcard() */ void QRegExp::setWildcard( bool wildcard ) { if ( wildcard != priv->wc ) { priv->wc = wildcard; compile( caseSensitive() ); } } #endif /*! Returns TRUE if minimal (non-greedy) matching is enabled; otherwise returns FALSE. \sa setMinimal() */ bool QRegExp::minimal() const { return priv->min; } /*! Enables or disables minimal matching. If \a minimal is FALSE, matching is greedy (maximal) which is the default. For example, suppose we have the input string "We must be \<b>bold\</b>, very \<b>bold\</b>!" and the pattern <b>\<b>.*\</b></b>. With the default greedy (maximal) matching, the match is "We must be <u>\<b>bold\</b>, very \<b>bold\</b></u>!". But with minimal (non-greedy) matching the first match is: "We must be <u>\<b>bold\</b></u>, very \<b>bold\</b>!" and the second match is "We must be \<b>bold\</b>, very <u>\<b>bold\</b></u>!". In practice we might use the pattern <b>\<b>[^\<]+\</b></b> instead, although this will still fail for nested tags. \sa minimal() */ void QRegExp::setMinimal( bool minimal ) { priv->min = minimal; } /*! Returns TRUE if \a str is matched exactly by this regular expression; otherwise returns FALSE. You can determine how much of the string was matched by calling matchedLength(). For a given regexp string, R, exactMatch("R") is the equivalent of search("^R$") since exactMatch() effectively encloses the regexp in the start of string and end of string anchors, except that it sets matchedLength() differently. For example, if the regular expression is <b>blue</b>, then exactMatch() returns TRUE only for input \c blue. For inputs \c bluebell, \c blutak and \c lightblue, exactMatch() returns FALSE and matchedLength() will return 4, 3 and 0 respectively. Although const, this function sets matchedLength(), capturedTexts() and pos(). \sa search() searchRev() QRegExpValidator */ bool QRegExp::exactMatch( const QString& str ) const { #ifndef QT_NO_REGEXP_CAPTURE priv->t = str; priv->capturedCache.clear(); #endif priv->captured = eng->match( str, 0, priv->min, TRUE, 0 ); if ( priv->captured[1] == (int) str.length() ) { return TRUE; } else { priv->captured.detach(); priv->captured[0] = 0; priv->captured[1] = eng->matchedLength(); return FALSE; } } #ifndef QT_NO_COMPAT /*! \obsolete Attempts to match in \a str, starting from position \a index. Returns the position of the match, or -1 if there was no match. The length of the match is stored in \a *len, unless \a len is a null pointer. If \a indexIsStart is TRUE (the default), the position \a index in the string will match the start of string anchor, <b>^</b>, in the regexp, if present. Otherwise, position 0 in \a str will match. Use search() and matchedLength() instead of this function. \sa QString::mid() QConstString */ int QRegExp::match( const QString& str, int index, int *len, bool indexIsStart ) const { int pos = search( str, index, indexIsStart ? CaretAtOffset : CaretAtZero ); if ( len != 0 ) *len = matchedLength(); return pos; } #endif // QT_NO_COMPAT -/*! - \overload - - This convenience function searches with a \c CaretMode of \c - CaretAtZero which is the most common usage. -*/ - int QRegExp::search( const QString& str, int offset ) const { return search( str, offset, CaretAtZero ); } /*! Attempts to find a match in \a str from position \a offset (0 by default). If \a offset is -1, the search starts at the last character; if -2, at the next to last character; etc. Returns the position of the first match, or -1 if there was no match. The \a caretMode parameter can be used to instruct whether <b>^</b> should match at index 0 or at \a offset. You might prefer to use QString::find(), QString::contains() or even QStringList::grep(). To replace matches use QString::replace(). Example: \code QString str = "offsets: 1.23 .50 71.00 6.00"; QRegExp rx( "\\d*\\.\\d+" ); // primitive floating point matching int count = 0; int pos = 0; while ( (pos = rx.search(str, pos)) != -1 ) { count++; pos += rx.matchedLength(); } // pos will be 9, 14, 18 and finally 24; count will end up as 4 \endcode Although const, this function sets matchedLength(), capturedTexts() and pos(). \sa searchRev() exactMatch() */ int QRegExp::search( const QString& str, int offset, CaretMode caretMode ) const { if ( offset < 0 ) offset += str.length(); #ifndef QT_NO_REGEXP_CAPTURE priv->t = str; priv->capturedCache.clear(); #endif priv->captured = eng->match( str, offset, priv->min, FALSE, caretIndex(offset, caretMode) ); return priv->captured[0]; } -/*! - \overload - - This convenience function searches with a \c CaretMode of \c - CaretAtZero which is the most common usage. -*/ - int QRegExp::searchRev( const QString& str, int offset ) const { return searchRev( str, offset, CaretAtZero ); } /*! Attempts to find a match backwards in \a str from position \a offset. If \a offset is -1 (the default), the search starts at the last character; if -2, at the next to last character; etc. Returns the position of the first match, or -1 if there was no match. The \a caretMode parameter can be used to instruct whether <b>^</b> should match at index 0 or at \a offset. Although const, this function sets matchedLength(), capturedTexts() and pos(). \warning Searching backwards is much slower than searching forwards. \sa search() exactMatch() */ int QRegExp::searchRev( const QString& str, int offset, CaretMode caretMode ) const { if ( offset < 0 ) offset += str.length(); #ifndef QT_NO_REGEXP_CAPTURE priv->t = str; priv->capturedCache.clear(); #endif if ( offset < 0 || offset > (int) str.length() ) { priv->captured.detach(); priv->captured.fill( -1 ); return -1; } while ( offset >= 0 ) { priv->captured = eng->match( str, offset, priv->min, TRUE, caretIndex(offset, caretMode) ); if ( priv->captured[0] == offset ) return offset; offset--; } return -1; } /*! Returns the length of the last matched string, or -1 if there was no match. \sa exactMatch() search() searchRev() */ int QRegExp::matchedLength() const { return priv->captured[1]; } #ifndef QT_NO_REGEXP_CAPTURE -/*! +/*! Returns the number of captures contained in the regular expression. */ int QRegExp::numCaptures() const { return eng->numCaptures(); } /*! Returns a list of the captured text strings. The first string in the list is the entire matched string. Each subsequent list element contains a string that matched a (capturing) subexpression of the regexp. For example: \code QRegExp rx( "(\\d+)(\\s*)(cm|inch(es)?)" ); int pos = rx.search( "Length: 36 inches" ); QStringList list = rx.capturedTexts(); // list is now ( "36 inches", "36", " ", "inches", "es" ) \endcode The above example also captures elements that may be present but which we have no interest in. This problem can be solved by using non-capturing parentheses: \code QRegExp rx( "(\\d+)(?:\\s*)(cm|inch(?:es)?)" ); int pos = rx.search( "Length: 36 inches" ); QStringList list = rx.capturedTexts(); // list is now ( "36 inches", "36", "inches" ) \endcode Note that if you want to iterate over the list, you should iterate over a copy, e.g. \code QStringList list = rx.capturedTexts(); QStringList::Iterator it = list.begin(); while( it != list.end() ) { myProcessing( *it ); ++it; } \endcode Some regexps can match an indeterminate number of times. For example if the input string is "Offsets: 12 14 99 231 7" and the regexp, \c{rx}, is <b>(\\d+)+</b>, we would hope to get a list of all the numbers matched. However, after calling \c{rx.search(str)}, capturedTexts() will return the list ( "12", "12" ), i.e. the entire match was "12" and the first subexpression matched was "12". The correct approach is to use cap() in a \link #cap_in_a_loop loop \endlink. The order of elements in the string list is as follows. The first element is the entire matching string. Each subsequent element corresponds to the next capturing open left parentheses. Thus capturedTexts()[1] is the text of the first capturing parentheses, capturedTexts()[2] is the text of the second and so on (corresponding to $1, $2, etc., in some other regexp languages). \sa cap() pos() exactMatch() search() searchRev() */ QStringList QRegExp::capturedTexts() { if ( priv->capturedCache.isEmpty() ) { for ( int i = 0; i < (int) priv->captured.size(); i += 2 ) { QString m; if ( priv->captured[i + 1] == 0 ) m = QString::fromLatin1( "" ); else if ( priv->captured[i] >= 0 ) m = priv->t.mid( priv->captured[i], priv->captured[i + 1] ); priv->capturedCache.append( m ); } priv->t = QString::null; } return priv->capturedCache; } /*! Returns the text captured by the \a nth subexpression. The entire match has index 0 and the parenthesized subexpressions have indices starting from 1 (excluding non-capturing parentheses). \code QRegExp rxlen( "(\\d+)(?:\\s*)(cm|inch)" ); int pos = rxlen.search( "Length: 189cm" ); if ( pos > -1 ) { QString value = rxlen.cap( 1 ); // "189" QString unit = rxlen.cap( 2 ); // "cm" // ... } \endcode The order of elements matched by cap() is as follows. The first element, cap(0), is the entire matching string. Each subsequent element corresponds to the next capturing open left parentheses. Thus cap(1) is the text of the first capturing parentheses, cap(2) is the text of the second, and so on. \target cap_in_a_loop Some patterns may lead to a number of matches which cannot be determined in advance, for example: \code QRegExp rx( "(\\d+)" ); str = "Offsets: 12 14 99 231 7"; QStringList list; pos = 0; while ( pos >= 0 ) { pos = rx.search( str, pos ); if ( pos > -1 ) { list += rx.cap( 1 ); pos += rx.matchedLength(); } } // list contains "12", "14", "99", "231", "7" \endcode \sa capturedTexts() pos() exactMatch() search() searchRev() */ QString QRegExp::cap( int nth ) { if ( nth < 0 || nth >= (int) priv->captured.size() / 2 ) return QString::null; else return capturedTexts()[nth]; } /*! Returns the position of the \a nth captured text in the searched string. If \a nth is 0 (the default), pos() returns the position of the whole match. Example: \code QRegExp rx( "/([a-z]+)/([a-z]+)" ); rx.search( "Output /dev/null" ); // returns 7 (position of /dev/null) rx.pos( 0 ); // returns 7 (position of /dev/null) rx.pos( 1 ); // returns 8 (position of dev) rx.pos( 2 ); // returns 12 (position of null) \endcode For zero-length matches, pos() always returns -1. (For example, if cap(4) would return an empty string, pos(4) returns -1.) This is due to an implementation tradeoff. \sa capturedTexts() exactMatch() search() searchRev() */ int QRegExp::pos( int nth ) { if ( nth < 0 || nth >= (int) priv->captured.size() / 2 ) return -1; else return priv->captured[2 * nth]; } /*! Returns a text string that explains why a regexp pattern is invalid the case being; otherwise returns "no error occurred". \sa isValid() */ QString QRegExp::errorString() { if ( isValid() ) { return QString( RXERR_OK ); } else { return eng->errorString(); } } #endif /*! Returns the string \a str with every regexp special character escaped with a backslash. The special characters are $, (, ), *, +, ., ?, [, \, ], ^, {, | and }. Example: \code s1 = QRegExp::escape( "bingo" ); // s1 == "bingo" s2 = QRegExp::escape( "f(x)" ); // s2 == "f\\(x\\)" \endcode This function is useful to construct regexp patterns dynamically: \code QRegExp rx( "(" + QRegExp::escape(name) + "|" + QRegExp::escape(alias) + ")" ); \endcode |