Add character swapping (no GUI yet)

1 files changed, 89 insertions, 0 deletions

diff --git a/source/core/StarText.cpp b/source/core/StarText.cpp
new file mode 100644
index 0000000..11fca27
--- /dev/null
+++ b/source/core/StarText.cpp
@@ -0,0 +1,89 @@
+#include "StarText.hpp"
+
+#include <regex>
+
+namespace Star {
+
+namespace Text {
+  static auto stripEscapeRegex = std::regex(strf("\\{:c}[^;]*{:c}", CmdEsc, EndEsc));
+  String stripEscapeCodes(String const& s) {
+    return std::regex_replace(s.utf8(), stripEscapeRegex, "");
+  }
+
+  static std::string escapeChars = strf("{:c}{:c}", CmdEsc, StartEsc);
+
+  bool processText(StringView text, TextCallback textFunc, CommandsCallback commandsFunc, bool includeCommandSides) {
+    std::string_view escChars(escapeChars);
+
+    std::string_view str = text.utf8();
+    while (true) {
+      size_t escape = str.find_first_of(escChars);
+      if (escape != NPos) {
+        escape = str.find_first_not_of(escChars, escape) - 1; // jump to the last ^
+
+        size_t end = str.find_first_of(EndEsc, escape);
+        if (end != NPos) {
+          if (escape && !textFunc(str.substr(0, escape)))
+            return false;
+          if (commandsFunc) {
+            StringView commands = includeCommandSides
+              ? str.substr(escape, end - escape + 1)
+              : str.substr(escape + 1, end - escape - 1);
+            if (!commands.empty() && !commandsFunc(commands))
+              return false;
+          }
+          str = str.substr(end + 1);
+          continue;
+        }
+      }
+
+      if (!str.empty())
+        return textFunc(str);
+
+      return true;
+    }
+  }
+
+  // The below two functions aren't used anymore, not bothering with StringView for them
+  String preprocessEscapeCodes(String const& s) {
+    bool escape = false;
+    std::string result = s.utf8();
+
+    size_t escapeStartIdx = 0;
+    for (size_t i = 0; i < result.size(); i++) {
+      auto& c = result[i];
+      if (isEscapeCode(c)) {
+        escape = true;
+        escapeStartIdx = i;
+      }
+      if ((c <= SpecialCharLimit) && !(c == StartEsc))
+        escape = false;
+      if ((c == EndEsc) && escape)
+        result[escapeStartIdx] = StartEsc;
+    }
+    return {result};
+  }
+
+  String extractCodes(String const& s) {
+    bool escape = false;
+    StringList result;
+    String escapeCode;
+    for (auto c : preprocessEscapeCodes(s)) {
+      if (c == StartEsc)
+        escape = true;
+      if (c == EndEsc) {
+        escape = false;
+        for (auto command : escapeCode.split(','))
+          result.append(command);
+        escapeCode = "";
+      }
+      if (escape && (c != StartEsc))
+        escapeCode.append(c);
+    }
+    if (!result.size())
+      return "";
+    return "^" + result.join(",") + ";";
+  }
+}
+
+}
\ No newline at end of file