New calling conventions, start on print.cpp

luprex/core/cpp/util.cpp

@@ -16,6 +16,25 @@
 
 namespace util {
 
+static bool ascii_isalpha(char c) {
+    return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
+}
+
+static bool ascii_isdigit(char c) {
+    return ((c >= '0') && (c <= '9'));
+}
+
+bool is_identifier(const std::string &str) {
+    if (str.size() == 0) return false;
+    char c=str[0];
+    if ((!ascii_isalpha(c)) && (c!='_')) return false;
+    for (int i = 1; i < int(str.size()); i++) {
+        char c = str[i];
+        if ((!ascii_isalpha(c)) && (!ascii_isdigit(c)) && (c!='_')) return false;
+    }
+    return true;
+}
+
 IdVector id_vector_create(int64_t id1, int64_t id2, int64_t id3, int64_t id4) {
     IdVector result;
     if (id1 >= 0) result.push_back(id1);