✨ add string.replace

makefile

@@ -331,6 +331,7 @@ test:nasal
 	@ ./nasal -e test/qrcode.nas
 	@ ./nasal -t -d test/quick_sort.nas
 	@ ./nasal -t -d test/regex_test.nas
+	@ ./nasal -t -d test/replace_test.nas
 	@ ./nasal -e test/scalar.nas hello world
 	@ ./nasal test/subprocess_test.nas
 	@ ./nasal -e test/trait.nas

src/nasal_dbg.cpp

@@ -154,6 +154,7 @@ void dbg::step_info() {
 
     src.load(files[bytecode[ctx.pc].fidx]);
 
+    std::clog << clear_screen << set_cursor;
     std::clog << "\nsource code:\n";
     for(u64 i = begin; i<end && i<src.size(); ++i) {
         std::clog << (i==line? back_white:reset);
@@ -200,7 +201,9 @@ void dbg::interact() {
         std::getline(std::cin, cmd);
         auto res = parse(cmd);
         if (res.size()==0) {
-            step_info();
+            // enter key without input using cmd_next by default
+            next = true;
+            return;
         } else if (res.size()==1) {
             switch(get_cmd_type(res[0])) {
                 case cmd_kind::cmd_help: help(); break;

src/nasal_dbg.h

@@ -85,8 +85,9 @@ private:
         {"exit", cmd_kind::cmd_exit}
     };
     cmd_kind get_cmd_type(const std::string& cmd) const {
-        return command_table.count(cmd)?
-            command_table.at(cmd):cmd_kind::cmd_error;
+        return command_table.count(cmd)
+                ? command_table.at(cmd)
+                : cmd_kind::cmd_error;
     }
 
 private:

src/nasal_err.cpp

@@ -14,6 +14,21 @@ struct for_reset {
 static for_reset windows_system_set;
 #endif
 
+std::ostream& clear_screen(std::ostream& s) {
+    // TODO: winapi clear screen
+    s << "\033c";
+    return s;
+}
+
+std::ostream& set_cursor(std::ostream& s) {
+#ifdef _WIN32
+    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), {0, 0});
+#else
+    s << "\033[0;0H";
+#endif
+    return s;
+}
+
 std::ostream& back_white(std::ostream& s) {
 #ifdef _WIN32
     SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 0xf0);

src/nasal_err.h

@@ -22,6 +22,8 @@ struct span {
     }
 };
 
+std::ostream& clear_screen(std::ostream&);
+std::ostream& set_cursor(std::ostream&);
 std::ostream& back_white(std::ostream&);
 std::ostream& red(std::ostream&);
 std::ostream& cyan(std::ostream&);

src/natives/builtin.cpp

@@ -92,36 +92,38 @@ var builtin_input(context* ctx, gc* ngc) {
 
 var builtin_split(context* ctx, gc* ngc) {
     auto local = ctx->localr;
-    var delimeter = local[1];
+    var separator = local[1];
     var str = local[2];
-    if (!delimeter.is_str()) {
+    if (!separator.is_str()) {
         return nas_err("native::split", "\"separator\" must be string");
     }
     if (!str.is_str()) {
         return nas_err("native::split", "\"str\" must be string");
     }
-    const auto& deli = delimeter.str();
+    const auto& sep = separator.str();
     const auto& s = str.str();
 
     // avoid being sweeped
     auto res = ngc->temp = ngc->alloc(vm_type::vm_vec);
     auto& vec = res.vec().elems;
 
-    if (!deli.length()) {
+    // empty separator means split every char
+    if (!sep.length()) {
         for(auto i : s) {
             vec.push_back(ngc->newstr(i));
         }
         ngc->temp = nil;
         return res;
     }
+
     usize last = 0;
-    usize pos = s.find(deli, 0);
+    usize pos = s.find(sep, 0);
     while(pos!=std::string::npos) {
         if (pos>last) {
             vec.push_back(ngc->newstr(s.substr(last, pos-last)));
         }
-        last = pos+deli.length();
-        pos = s.find(deli, last);
+        last = pos + sep.length();
+        pos = s.find(sep, last);
     }
     if (last!=s.length()) {
         vec.push_back(ngc->newstr(s.substr(last)));
@@ -130,6 +132,54 @@ var builtin_split(context* ctx, gc* ngc) {
     return res;
 }
 
+var builtin_split_with_empty_substr(context* ctx, gc* ngc) {
+    auto local = ctx->localr;
+    var separator = local[1];
+    var str = local[2];
+    if (!separator.is_str()) {
+        return nas_err(
+            "native::split_with_empty_substr",
+            "\"separator\" must be string"
+        );
+    }
+    if (!str.is_str()) {
+        return nas_err(
+            "native::split_with_empty_substr",
+            "\"str\" must be string"
+        );
+    }
+    const auto& sep = separator.str();
+    const auto& s = str.str();
+
+    // avoid being sweeped
+    auto res = ngc->temp = ngc->alloc(vm_type::vm_vec);
+    auto& vec = res.vec().elems;
+
+    // empty separator means split every char
+    if (!sep.length()) {
+        for(auto i : s) {
+            vec.push_back(ngc->newstr(i));
+        }
+        ngc->temp = nil;
+        return res;
+    }
+
+    usize last = 0;
+    usize pos = s.find(sep, 0);
+    while(pos!=std::string::npos) {
+        if (pos>=last) {
+            vec.push_back(ngc->newstr(s.substr(last, pos-last)));
+        }
+        last = pos + sep.length();
+        pos = s.find(sep, last);
+    }
+    if (last<=s.length()) {
+        vec.push_back(ngc->newstr(s.substr(last)));
+    }
+    ngc->temp = nil;
+    return res;
+}
+
 var builtin_rand(context* ctx, gc* ngc) {
     auto val = ctx->localr[1];
     if (!val.is_num() && !val.is_nil()) {
@@ -746,6 +796,7 @@ nasal_builtin_table builtin[] = {
     {"__system", builtin_system},
     {"__input", builtin_input},
     {"__split", builtin_split},
+    {"__split_with_empty_substr", builtin_split_with_empty_substr},
     {"__rand", builtin_rand},
     {"__id", builtin_id},
     {"__int", builtin_int},

src/natives/builtin.h

@@ -39,6 +39,7 @@ var builtin_setsize(context*, gc*);
 var builtin_system(context*, gc*);
 var builtin_input(context*, gc*);
 var builtin_split(context*, gc*);
+var builtin_split_with_empty_substr(context*, gc*);
 var builtin_rand(context*, gc*);
 var builtin_id(context*, gc*);
 var builtin_int(context*, gc*);

std/string.nas

@@ -39,3 +39,28 @@ var to_char = func(number) {
 var to_num = func(character) {
     return __temp_contains(__char_to_num, character)? __char_to_num[character]:-1;
 }
+
+var __string_split_with_empty_substr = func(separator, str) {
+    return __split_with_empty_substr(separator, str);
+}
+
+var replace = func(needle, haystack, replacement) {
+    var needle_size = size(needle);
+    var haystack_size = size(haystack);
+    var replacement_size = size(replacement);
+
+    if (needle_size == 0 or
+        haystack_size == 0 or
+        replacement_size == 0 or
+        needle_size > haystack_size
+    ) {
+        return haystack;
+    }
+    if (needle == haystack) {
+        return replacement;
+    }
+
+    var vec = __string_split_with_empty_substr(needle, haystack);
+
+    return join(replacement, vec);
+}

test/replace_test.nas

@@ -0,0 +1,22 @@
+use std.string;
+
+var test_set = [
+    ["{}", "{}", "a", "a"],
+    ["{}", "a{}", "a", "aa"],
+    ["{}", "{}a", "a", "aa"],
+    ["{}", "a{}a", "a", "aaa"],
+    ["{}", "{}a{}", "a", "aaa"],
+    ["{}", "{{}}", "a", "{a}"],
+    ["{}", "{}{}{}", "a", "aaa"]
+];
+
+foreach(var i; test_set) {
+    if (string.replace(i[0], i[1], i[2]) != i[3]) {
+        println("Error: string.replace(",
+                i[0], ", ",
+                i[1], ", ",
+                i[2], ") != ",
+                i[3]);
+        exit(-1);
+    }
+}