ChatON: tokenize keeping in mind the taggedMessage subparts

Initial go

common/chaton.hpp

@@ -628,6 +628,51 @@ inline int32_t chaton_tmpl_apply_ex_capi(
     return taggedLength;
 }
 
+// Copied from common.cpp
+std::vector<llama_token> chaton_llama_tokenize(
+    const struct llama_model * model,
+           const std::string & text,
+                        bool   add_special,
+                        bool   parse_special) {
+    LOGLN("DBUG:%s:%s:special[add:%d, parse:%d]", __func__, text.c_str(), add_special, parse_special);
+    // upper limit for the number of tokens
+    int n_tokens = text.length() + 2 * add_special;
+    std::vector<llama_token> result(n_tokens);
+    n_tokens = llama_tokenize(model, text.data(), text.length(), result.data(), result.size(), add_special, parse_special);
+    if (n_tokens < 0) {
+        result.resize(-n_tokens);
+        int check = llama_tokenize(model, text.data(), text.length(), result.data(), result.size(), add_special, parse_special);
+        GGML_ASSERT(check == -n_tokens);
+    } else {
+        result.resize(n_tokens);
+    }
+    return result;
+}
+
+// Tokenize the passed taggedText, keeping in mind the subparts within and
+// inturn whether to parse special tokens in them or not (partsTypes).
+std::vector<llama_token> chaton_llama_tokenize_ex(
+        const llama_context *ctx,
+        const std::string &taggedText,
+        const std::string &partsTypes,
+        const std::vector<int32_t> &partsLengths,
+        bool addSpecial
+        ) {
+    std::vector<llama_token> tokens;
+    int iPart = 0;
+    int iStart = 0;
+    for(auto partLen: partsLengths) {
+        auto partType = partsTypes[iPart];
+        iPart += 1;
+        auto msgPart = taggedText.substr(iStart, partLen);
+        iStart += partLen;
+        auto parseSpecial = partType == ChatParts::S ? true : false;
+        auto curTokens = chaton_llama_tokenize(llama_get_model(ctx), msgPart, addSpecial, parseSpecial);
+        tokens.insert(tokens.end(), curTokens.begin(), curTokens.end());
+    }
+    return tokens;
+}
+
 
 /**
  * if tmpl is