generic-library/ChaiScript
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Improved eval and error handling

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This commit is contained in:
Jonathan Turner
2009-06-08 18:13:44 +00:00
parent 71af6162a1
commit 3483b14c2b
1 changed files with 33 additions and 22 deletions
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37
wesley/main.cpp
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@@ -88,6 +88,21 @@ const Boxed_Value add_two(BoxedCPP_System &ss, const std::vector<Boxed_Value> &v
return dispatch(ss.get_function("+"), vals);
}
const Boxed_Value eval(Lexer &lexer, Rule &parser, BoxedCPP_System &ss, const std::vector<Boxed_Value> &vals) {
std::string val;
try {
val = Cast_Helper<std::string &>()(vals[0]);
}
catch (std::exception &e) {
throw EvalError("Can not evaluate string: " + val, TokenPtr());
}
catch (EvalError &ee) {
throw EvalError("Can not evaluate string: " + val + " reason: " + ee.reason, TokenPtr());
}
return evaluate_string(lexer, parser, ss, val, "__EVAL__");
}
std::string load_file(const char *filename) {
std::ifstream infile (filename, std::ios::in | std::ios::ate);
@@ -206,7 +221,7 @@ Lexer build_lexer() {
return lexer;
}
BoxedCPP_System build_eval_system() {
BoxedCPP_System build_eval_system(Lexer &lexer, Rule &parser) {
BoxedCPP_System ss;
bootstrap(ss);
bootstrap_vector<std::vector<int> >(ss, "VectorInt");
@@ -229,6 +244,10 @@ BoxedCPP_System build_eval_system() {
ss.register_function(boost::shared_ptr<Proxy_Function>(
new Dynamic_Proxy_Function(boost::bind(&add_two, boost::ref(ss), _1), 2)), "add_two");
ss.register_function(boost::shared_ptr<Proxy_Function>(
new Dynamic_Proxy_Function(boost::bind(&eval, boost::ref(lexer), boost::ref(parser),
boost::ref(ss), _1), 1)), "eval");
return ss;
}
@@ -376,16 +395,6 @@ Boxed_Value eval_token(BoxedCPP_System &ss, TokenPtr node) {
}
break;
case (TokenType::Fun_Call) : {
if (node->children[0]->text == "eval") {
Lexer new_lexer = build_lexer();
Rule new_parser = build_parser_rules();
Boxed_Value arg = eval_token(ss, node->children[1]);
std::string arg_string = Cast_Helper<std::string &>()(arg);
retval = evaluate_string(new_lexer, new_parser, ss, arg_string, "__EVAL__");
}
else {
Param_List_Builder plb;
for (i = 1; i < node->children.size(); ++i) {
plb << eval_token(ss, node->children[i]);
@@ -393,11 +402,13 @@ Boxed_Value eval_token(BoxedCPP_System &ss, TokenPtr node) {
try {
retval = dispatch(ss.get_function(node->children[0]->text), plb);
}
catch(EvalError &ee) {
throw EvalError(ee.reason, node->children[0]);
}
catch(std::exception &e){
throw EvalError("Can not find appropriate '" + node->children[0]->text + "'", node->children[0]);
}
}
}
break;
case (TokenType::Method_Call) : {
retval = eval_token(ss, node->children[0]);
@@ -618,7 +629,7 @@ int main(int argc, char *argv[]) {
Lexer lexer = build_lexer();
Rule parser = build_parser_rules();
BoxedCPP_System ss = build_eval_system();
BoxedCPP_System ss = build_eval_system(lexer, parser);
if (argc < 2) {
std::cout << "eval> ";