add WebAssembly for Kws (#648)

sherpa-onnx/csrc/keyword-spotter-transducer-impl.h

@@ -266,8 +266,14 @@ class KeywordSpotterTransducerImpl : public KeywordSpotterImpl {
   }
 
   void InitKeywords() {
+#ifdef SHERPA_ONNX_ENABLE_WASM_KWS
+    // Due to the limitations of the wasm file system,
+    // the keyword_file variable is directly parsed as a string of keywords
+    // if WASM KWS on
+    std::istringstream is(config_.keywords_file);
+    InitKeywords(is);
+#else
     // each line in keywords_file contains space-separated words
-
     std::ifstream is(config_.keywords_file);
     if (!is) {
       SHERPA_ONNX_LOGE("Open keywords file failed: %s",
@@ -275,6 +281,7 @@ class KeywordSpotterTransducerImpl : public KeywordSpotterImpl {
       exit(-1);
     }
     InitKeywords(is);
+#endif
   }
 
 #if __ANDROID_API__ >= 9

sherpa-onnx/csrc/keyword-spotter.cc

@@ -94,10 +94,17 @@ bool KeywordSpotterConfig::Validate() const {
     SHERPA_ONNX_LOGE("Please provide --keywords-file.");
     return false;
   }
+
+#ifndef SHERPA_ONNX_ENABLE_WASM_KWS
+  // due to the limitations of the wasm file system,
+  // keywords file will be packaged into the sherpa-onnx-wasm-kws-main.data file
+  // Solution: take keyword_file variable is directly
+  // parsed as a string of keywords
   if (!std::ifstream(keywords_file.c_str()).good()) {
     SHERPA_ONNX_LOGE("Keywords file %s does not exist.", keywords_file.c_str());
     return false;
   }
+#endif
 
   return model_config.Validate();
 }

sherpa-onnx/csrc/transducer-keyword-decoder.cc

@@ -2,16 +2,14 @@
 //
 // Copyright (c)  2023-2024  Xiaomi Corporation
 
-#include "sherpa-onnx/csrc/transducer-keyword-decoder.h"
-
 #include <algorithm>
 #include <cmath>
-#include <cstring>
 #include <utility>
 #include <vector>
 
 #include "sherpa-onnx/csrc/log.h"
 #include "sherpa-onnx/csrc/onnx-utils.h"
+#include "sherpa-onnx/csrc/transducer-keyword-decoder.h"
 
 namespace sherpa_onnx {