fix: OpenFst compatibility + add C++ runtime CI (#359) (#360)

* fix: use StringTokenType for OpenFst 1.8+ compatibility (#359)

* ci: add C++ runtime build workflow

Trigger on runtime/** changes. Builds on ubuntu and macos.

* fix: revert to TokenType for csukuangfj/openfst fork compatibility

The project uses csukuangfj/openfst v1.8.5 which keeps the original
fst::TokenType enum. The previous commit incorrectly renamed it to
StringTokenType (which is used in official OpenFst releases).

* fix: drop explicit TokenType::BYTE for OpenFst compatibility (#359)

Both StringCompiler and StringPrinter default to BYTE mode, so the
argument can be omitted entirely. This avoids the TokenType vs
StringTokenType naming difference between the csukuangfj fork and
official OpenFst releases.

Author: pengzhendong

.github/workflows/runtime.yml

@@ -0,0 +1,22 @@
+name: Runtime Build
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - 'runtime/**'
+      - '.github/workflows/runtime.yml'
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build runtime
+        run: |
+          cmake -B build -S runtime -DBUILD_TESTING=OFF
+          cmake --build build -j$(nproc 2>/dev/null || sysctl -n hw.ncpu)

runtime/processor/wetext_processor.cc

@@ -14,15 +14,13 @@
 
 #include "processor/wetext_processor.h"
 
-using fst::TokenType;
-
 namespace wetext {
 Processor::Processor(const std::string& tagger_path,
                      const std::string& verbalizer_path) {
   tagger_.reset(StdVectorFst::Read(tagger_path));
   verbalizer_.reset(StdVectorFst::Read(verbalizer_path));
-  compiler_ = std::make_shared<StringCompiler<StdArc>>(TokenType::BYTE);
-  printer_ = std::make_shared<StringPrinter<StdArc>>(TokenType::BYTE);
+  compiler_ = std::make_shared<StringCompiler<StdArc>>();
+  printer_ = std::make_shared<StringPrinter<StdArc>>();
 
   if (tagger_path.find("zh_tn_") != tagger_path.npos) {
     parse_type_ = ParseType::kZH_TN;