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GDScript: add an optional message parameter to assert()

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Before this patch, assert() only took the condition to assert on:

    assert(item_data)

Now, it can optionally take a string that will be printed upon failure:

    assert(item_data, item_name + " has no item data in ItemDatabase")

This makes it easier to immediately see what the issue is by being
able to write informative failure messages.

Thanks to @wiped1 for sharing their patch, upon which this is based.

Closes #17082
This commit is contained in:
Mitch Curtis 2019-08-06 13:28:22 +02:00
parent 750f8d4926
commit aa8e3e7b0f
4 changed files with 50 additions and 11 deletions
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33
modules/gdscript/gdscript_parser.cpp
View file

@ -3280,15 +3280,36 @@ void GDScriptParser::_parse_block(BlockNode *p_block, bool p_static) {
case GDScriptTokenizer::TK_PR_ASSERT: {
tokenizer->advance();
Node *condition = _parse_and_reduce_expression(p_block, p_static);
if (!condition) {
if (_recover_from_completion()) {
break;
}
if (tokenizer->get_token() != GDScriptTokenizer::TK_PARENTHESIS_OPEN) {
_set_error("Expected '(' after assert");
return;
}
tokenizer->advance();
Vector<Node *> args;
const bool result = _parse_arguments(p_block, args, p_static);
if (!result) {
return;
}
if (args.empty() || args.size() > 2) {
_set_error("Wrong number of arguments, expected 1 or 2");
return;
}
AssertNode *an = alloc_node<AssertNode>();
an->condition = condition;
an->condition = _reduce_expression(args[0], p_static);
if (args.size() == 2) {
an->message = _reduce_expression(args[1], p_static);
} else {
ConstantNode *message_node = alloc_node<ConstantNode>();
message_node->value = String();
an->message = message_node;
}
p_block->statements.push_back(an);
if (!_end_statement()) {