generic-library/ChaiScript
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Only allow class in top level scope

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* Throw error if class is in unexpected place
 * Allow catching of `eval_error` from inside of script

closes #297
This commit is contained in:
Jason Turner 2016-10-28 10:56:12 -06:00
parent 77231461ca
commit a38b254a98
3 changed files with 15 additions and 14 deletions
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7
include/chaiscript/language/chaiscript_eval.hpp
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@ -1313,11 +1313,8 @@ namespace chaiscript
try {
retval = this->children[0]->eval(t_ss);
}
catch (exception::eval_error &) {
if (this->children.back()->identifier == AST_Node_Type::Finally) {
this->children.back()->children[0]->eval(t_ss);
}
throw;
catch (const exception::eval_error &e) {
retval = handle_exception(t_ss, Boxed_Value(std::ref(e)));
}
catch (const std::runtime_error &e) {
retval = handle_exception(t_ss, Boxed_Value(std::ref(e)));

12
include/chaiscript/language/chaiscript_parser.hpp
View File

@ -1700,12 +1700,16 @@ namespace chaiscript
}
/// Reads a class block from input
bool Class() {
bool Class(const bool t_class_allowed) {
bool retval = false;
size_t prev_stack_top = m_match_stack.size();
if (Keyword("class")) {
if (!t_class_allowed) {
throw exception::eval_error("Class definitions only allowed at top scope", File_Position(m_position.line, m_position.col), *m_filename);
}
retval = true;
if (!Id()) {
@ -2375,7 +2379,7 @@ namespace chaiscript
}
/// Top level parser, starts parsing of all known parses
bool Statements() {
bool Statements(const bool t_class_allowed = false) {
bool retval = false;
bool has_more = true;
@ -2383,7 +2387,7 @@ namespace chaiscript
while (has_more) {
const auto start = m_position;
if (Def() || Try() || If() || While() || Class() || For() || Switch()) {
if (Def() || Try() || If() || While() || Class(t_class_allowed) || For() || Switch()) {
if (!saw_eol) {
throw exception::eval_error("Two function definitions missing line separator", File_Position(start.line, start.col), *m_filename);
}
@ -2424,7 +2428,7 @@ namespace chaiscript
/// \todo respect // -*- coding: utf-8 -*- on line 1 or 2 see: http://evanjones.ca/python-utf8.html)
}
if (Statements()) {
if (Statements(true)) {
if (m_position.has_more()) {
throw exception::eval_error("Unparsed input", File_Position(m_position.line, m_position.col), t_fname);
} else {

10
unittests/class_inside_scope.chai
View File

@ -1,8 +1,8 @@
{
class C {
var data;
def C() {}
}
try {
parse("{ class C { var data; def C() {} } }")
assert_false(true)
} catch (e) {
assert_true(true)
}