[vala/staging] scanner: Accept \R and \N escape sequences in regex literals

[Rico Tzschichholz <ricotz src gnome org>]

commit b22d43fbdcf807b4e894ca6a502ff620d65001c6
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon May 14 09:31:32 2018 +0200

    scanner: Accept \R and \N escape sequences in regex literals
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749576

 tests/Makefile.am           |    1 +
 tests/parser/bug749576.vala |   29 +++++++++++++++++++++++++++++
 vala/valageniescanner.vala  |    2 ++
 vala/valascanner.vala       |    2 ++
 4 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 1658f92..764ca19 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -456,6 +456,7 @@ TESTS = \
        parser/unsupported-property-async.test \
        parser/unsupported-property-throws.test \
        parser/yield-method.test \
+       parser/bug749576.vala \
        semantic/constant-extern.test \
        semantic/constant-value.test \
        semantic/constant-value-missing.test \
diff --git a/tests/parser/bug749576.vala b/tests/parser/bug749576.vala
new file mode 100644
index 0000000..8aa961a
--- /dev/null
+++ b/tests/parser/bug749576.vala
@@ -0,0 +1,29 @@
+void main() {
+       unowned string a = "first line\nnext line";
+       unowned string b = "first line\rnext line";
+       unowned string c = "first \tline\r\nnext \tline";
+
+       assert (/\Rnext/.match (a));
+       assert (/\Rnext/.match (b));
+       assert (/\Rnext/.match (c));
+
+       try {
+               var r = new Regex ("\\Rnext");
+               assert (r.match (a));
+
+               var r2 = new Regex ("""\Rnext""");
+               assert (r2.match (a));
+       } catch {
+       }
+
+       assert (/\Nline/.match (c));
+
+       try {
+               var r = new Regex ("\\Nline");
+               assert (r.match (c));
+
+               var r2 = new Regex ("""\Nline""");
+               assert (r2.match (c));
+       } catch {
+       }
+}
diff --git a/vala/valageniescanner.vala b/vala/valageniescanner.vala
index 177f2b0..de49d9d 100644
--- a/vala/valageniescanner.vala
+++ b/vala/valageniescanner.vala
@@ -208,7 +208,9 @@ public class Vala.Genie.Scanner {
                                                case 'B':
                                                case 'f':
                                                case 'n':
+                                               case 'N':
                                                case 'r':
+                                               case 'R':
                                                case 't':
                                                case 'a':
                                                case 'A':
diff --git a/vala/valascanner.vala b/vala/valascanner.vala
index 2cb7050..9af17dc 100644
--- a/vala/valascanner.vala
+++ b/vala/valascanner.vala
@@ -193,7 +193,9 @@ public class Vala.Scanner {
                                                case 'B':
                                                case 'f':
                                                case 'n':
+                                               case 'N':
                                                case 'r':
+                                               case 'R':
                                                case 't':
                                                case 'v':
                                                case 'a':