reapack

commit eb453aaca94cc029b16ded25726ae45ed3fc75e8
parent 4b3d4eaeb0b466543862a3e9b08e83d51a5ba555
Author: cfillion <cfillion@users.noreply.github.com>
Date:   Wed,  6 May 2020 19:31:33 -0400

strip away RTF to enable richtext display on Linux [p=2247988]

Diffstat:
M
src/richedit-generic.cpp
 | 
6
++++--
M
src/string.cpp
 | 
30
++++++++++++++++++++++++++++++
M
src/string.hpp
 | 
1
+
M
test/string.cpp
 | 
35
+++++++++++++++++++++++++++++++++++

4 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/src/richedit-generic.cpp b/src/richedit-generic.cpp
@@ -17,6 +17,8 @@
 
 #include "richedit.hpp"
 
+#include "string.hpp"
+
 // This is the Linux implementation of RichEdit
 // See also richedit.mm and richedit-win32.cpp
 
@@ -42,6 +44,6 @@ void RichEdit::setPlainText(const std::string &text)
 
 bool RichEdit::setRichText(const std::string &rtf)
 {
-  (void)rtf;
-  return false;
+  setPlainText(String::stripRtf(rtf));
+  return true;
 }
diff --git a/src/string.cpp b/src/string.cpp
@@ -17,8 +17,10 @@
 
 #include "string.hpp"
 
+#include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/trim.hpp>
 #include <cstdarg>
+#include <regex>
 #include <sstream>
 
 std::string String::format(const char *fmt, ...)
@@ -63,6 +65,34 @@ std::string String::indent(const std::string &text)
   return output;
 }
 
+std::string String::stripRtf(const std::string &rtf)
+{
+  static const std::regex rtfRules(
+    // passthrough for later replacement to \n
+    R"((\\line |\\par\}))" "|"
+    R"(\\line(\n)\s*)" "|"
+
+    // preserve literal braces
+    R"(\\([\{\}]))" "|"
+
+    // hidden groups (strip contents)
+    R"(\{\\(?:f\d+|fonttbl|colortbl)[^\{\}]+\})" "|"
+
+    // formatting tags and groups (keep contents)
+    R"(\\\w+\s?|\{|\})" "|"
+
+    // newlines and indentation
+    R"(\s*\n\s*)"
+  );
+
+  std::string text = std::regex_replace(rtf, rtfRules, "$1$2$3");
+  boost::algorithm::replace_all(text, "\\line ", "\n");
+  boost::algorithm::replace_all(text, "\\par}", "\n\n");
+  boost::algorithm::trim(text);
+
+  return text;
+}
+
 void String::ImplDetail::imbueStream(std::ostream &stream)
 {
   class NumPunct : public std::numpunct<char>
diff --git a/src/string.hpp b/src/string.hpp
@@ -32,6 +32,7 @@ namespace String {
   std::string format(const char *fmt, ...);
 
   std::string indent(const std::string &);
+  std::string stripRtf(const std::string &);
 
   template<typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>>
   std::string number(const T v)
diff --git a/test/string.cpp b/test/string.cpp
@@ -25,3 +25,38 @@ TEST_CASE("indent string", M) {
 TEST_CASE("pretty-print numbers", M) {
   REQUIRE(String::number(42'000'000) == "42,000,000");
 }
+
+TEST_CASE("strip RTF header", M) {
+  REQUIRE("Hello World" == String::stripRtf(R"(
+    {\rtf1\ansi{\fonttbl\f0\fswiss Helvetica;}\f0\pard
+    Hello World
+    }
+  )"));
+}
+
+TEST_CASE("strip RTF color header", M) {
+  REQUIRE("Hello World" == String::stripRtf(R"(
+    {\rtf1\ansi\deff0{\fonttbl{\f0 \fswiss Helvetica;}{\f1 Courier;}}
+    {\colortbl;\red255\green0\blue0;\red0\green0\blue255;}
+    \widowctrl\hyphauto
+    Hello World
+    }
+  )"));
+}
+
+TEST_CASE("strip RTF paragraphs", M) {
+  REQUIRE("foo\n\nbar\n\nbaz" == String::stripRtf(R"(
+    {\pard \ql \f0 \sa180 \li0 \fi0 \b \fs36 foo\par}
+    {\pard \ql \f0 \sa180 \li0 \fi0 \b \fs36 bar\par}
+    {\pard \ql \f0 \sa180 \li0 \fi0 \b \fs36 baz\par}
+  )"));
+}
+
+TEST_CASE("strip RTF line breaks", M) {
+  REQUIRE("foo\nbar\nbaz" == String::stripRtf(R"(foo\line bar\line
+  baz\line)"));
+}
+
+TEST_CASE("strip RTF literal braces", M) {
+  REQUIRE("{ }" == String::stripRtf(R"(\{ \})"));
+}