re2: add dot_nl to the RE2::Options class

This allows clients to set the “s” flag by default for a given
regular expression without the need to mess with the pattern by
prefixing it with “(?s)”.  This matters if the pattern comes
from the user.

Fixes issue 70.

R=rsc
CC=re2-dev
https://codereview.appspot.com/44070048

1 files changed, 8 insertions, 1 deletions

diff --git a/re2/re2.h b/re2/re2.h
index e0ee080..2774031 100644
--- a/re2/re2.h
+++ b/re2/re2.h
@@ -515,6 +515,7 @@ class RE2 {
     //   max_mem          (see below)  approx. max memory footprint of RE2
     //   literal          (false) interpret string as literal, not regexp
     //   never_nl         (false) never match \n, even if it is in regexp
+    //   dot_nl           (false) dot matches everything including new line
     //   never_capture    (false) parse all parens as non-capturing
     //   case_sensitive   (true)  match is case-sensitive (regexp can override
     //                              with (?i) unless in posix_syntax mode)
@@ -570,13 +571,14 @@ class RE2 {
       max_mem_(kDefaultMaxMem),
       literal_(false),
       never_nl_(false),
+      dot_nl_(false),
       never_capture_(false),
       case_sensitive_(true),
       perl_classes_(false),
       word_boundary_(false),
       one_line_(false) {
     }
-    
+
     /*implicit*/ Options(CannedOptions);
 
     Encoding encoding() const { return encoding_; }
@@ -611,6 +613,9 @@ class RE2 {
     bool never_nl() const { return never_nl_; }
     void set_never_nl(bool b) { never_nl_ = b; }
 
+    bool dot_nl() const { return dot_nl_; }
+    void set_dot_nl(bool b) { dot_nl_ = b; }
+
     bool never_capture() const { return never_capture_; }
     void set_never_capture(bool b) { never_capture_ = b; }
 
@@ -634,6 +639,7 @@ class RE2 {
       max_mem_ = src.max_mem_;
       literal_ = src.literal_;
       never_nl_ = src.never_nl_;
+      dot_nl_ = src.dot_nl_;
       never_capture_ = src.never_capture_;
       case_sensitive_ = src.case_sensitive_;
       perl_classes_ = src.perl_classes_;
@@ -651,6 +657,7 @@ class RE2 {
     int64_t max_mem_;
     bool literal_;
     bool never_nl_;
+    bool dot_nl_;
     bool never_capture_;
     bool case_sensitive_;
     bool perl_classes_;