From 796875721aa31dab01eb3d14f0b86f6ae2d29ffd Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Mon, 2 Jun 2025 00:17:32 +0200
Subject: [PATCH] xgettext: C++: Improve heuristic for Boost format strings.

* gettext-tools/src/format-boost.c (struct spec): Add field
'likely_intentional_directives'.
(format_parse): Set it to the number of directives that don't contain a space.
(format_is_unlikely_intentional): New function.
(formatstring_boost): Use it.
* gettext-tools/tests/format-boost-3: New file.
* gettext-tools/tests/Makefile.am (TESTS): Add it.
---
 gettext-tools/src/format-boost.c   | 26 +++++++++++++++--
 gettext-tools/tests/Makefile.am    |  2 +-
 gettext-tools/tests/format-boost-3 | 47 ++++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+), 3 deletions(-)
 create mode 100755 gettext-tools/tests/format-boost-3

diff --git a/gettext-tools/src/format-boost.c b/gettext-tools/src/format-boost.c
index eb7e2ece2..f704772b9 100644
--- a/gettext-tools/src/format-boost.c
+++ b/gettext-tools/src/format-boost.c
@@ -92,6 +92,11 @@ struct numbered_arg
 struct spec
 {
   unsigned int directives;
+  /* We consider a directive as "likely intentional" if it does not contain a
+     space.  This prevents xgettext from flagging strings like "100% complete"
+     as 'boost-format' if they don't occur in a context that requires a format
+     string.  */
+  unsigned int likely_intentional_directives;
   unsigned int numbered_arg_count;
   struct numbered_arg *numbered;
 };
@@ -117,6 +122,7 @@ format_parse (const char *format, bool translated, char *fdi,
   struct spec *result;
 
   spec.directives = 0;
+  spec.likely_intentional_directives = 0;
   spec.numbered_arg_count = 0;
   spec.numbered = NULL;
   numbered_allocated = 0;
@@ -127,6 +133,8 @@ format_parse (const char *format, bool translated, char *fdi,
     if (*format++ == '%')
       {
         /* A directive.  */
+        bool likely_intentional = true;
+
         FDI_SET (format - 1, FMTDIR_START);
         spec.directives++;
 
@@ -184,7 +192,11 @@ format_parse (const char *format, bool translated, char *fdi,
                         || *format == '#' || *format == '0' || *format == '\''
                         || *format == '_' || *format == '=' || *format == 'h'
                         || *format == 'l')
-                      format++;
+                      {
+                        if (*format == ' ')
+                          likely_intentional = false;
+                        format++;
+                      }
                     else
                       break;
                   }
@@ -499,6 +511,8 @@ format_parse (const char *format, bool translated, char *fdi,
               }
           }
 
+        if (likely_intentional)
+          spec.likely_intentional_directives++;
         FDI_SET (format - 1, FMTDIR_END);
       }
 
@@ -582,6 +596,14 @@ format_get_number_of_directives (void *descr)
   return spec->directives;
 }
 
+static bool
+format_is_unlikely_intentional (void *descr)
+{
+  struct spec *spec = (struct spec *) descr;
+
+  return spec->likely_intentional_directives == 0;
+}
+
 static bool
 format_check (void *msgid_descr, void *msgstr_descr, bool equality,
               formatstring_error_logger_t error_logger, void *error_logger_data,
@@ -666,7 +688,7 @@ struct formatstring_parser formatstring_boost =
   format_parse,
   format_free,
   format_get_number_of_directives,
-  NULL,
+  format_is_unlikely_intentional,
   format_check
 };
 
diff --git a/gettext-tools/tests/Makefile.am b/gettext-tools/tests/Makefile.am
index 11286f094..eff5a313d 100644
--- a/gettext-tools/tests/Makefile.am
+++ b/gettext-tools/tests/Makefile.am
@@ -196,7 +196,7 @@ TESTS = gettext-1 gettext-2 \
 	xgettext-ycp-stackovfl-1 xgettext-ycp-stackovfl-2 \
 	xgettext-ycp-stackovfl-3 xgettext-ycp-stackovfl-4 \
 	format-awk-1 format-awk-2 format-awk-3 \
-	format-boost-1 format-boost-2 \
+	format-boost-1 format-boost-2 format-boost-3 \
 	format-c-1 format-c-2 format-c-3 format-c-4 format-c-5 format-c-6 \
 	format-c++-brace-1 format-c++-brace-2 \
 	format-csharp-1 format-csharp-2 \
diff --git a/gettext-tools/tests/format-boost-3 b/gettext-tools/tests/format-boost-3
new file mode 100755
index 000000000..31a5b3252
--- /dev/null
+++ b/gettext-tools/tests/format-boost-3
@@ -0,0 +1,47 @@
+#! /bin/sh
+. "${srcdir=.}/init.sh"; path_prepend_ . ../src
+
+# Test heuristic recognition of Boost format strings like "100% complete".
+
+cat <<\EOF > f-bo-3.cc
+gettext("Test 1a is 100% complete");
+format(gettext("Test 1b is 100% complete"), 120);
+gettext("Test 2a from 0% complete to 100% complete");
+format(gettext("Test 2b from 0% complete to 100% complete"), 120, 121);
+gettext("Test 3a of %s is 100% complete");
+format(gettext("Test 3b of %s is 100% complete"), "foo", 120);
+EOF
+
+: ${XGETTEXT=xgettext}
+${XGETTEXT} --boost --omit-header --no-location -d f-bo-3.tmp f-bo-3.cc || Exit 1
+LC_ALL=C tr -d '\r' < f-bo-3.tmp.po > f-bo-3.po || Exit 1
+
+cat <<\EOF > f-bo-3.ok
+msgid "Test 1a is 100% complete"
+msgstr ""
+
+#, boost-format
+msgid "Test 1b is 100% complete"
+msgstr ""
+
+msgid "Test 2a from 0% complete to 100% complete"
+msgstr ""
+
+#, boost-format
+msgid "Test 2b from 0% complete to 100% complete"
+msgstr ""
+
+#, c-format, boost-format
+msgid "Test 3a of %s is 100% complete"
+msgstr ""
+
+#, boost-format
+msgid "Test 3b of %s is 100% complete"
+msgstr ""
+EOF
+
+: ${DIFF=diff}
+${DIFF} f-bo-3.ok f-bo-3.po
+result=$?
+
+exit $result
-- 
2.47.3