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LibJS: Implement if statements

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If statements execute a certain action or an alternative one depending
on whether the tested condition is true or false, this commit helps
establish basic control flow capabilities in the AST.
This commit is contained in:
0xtechnobabble 2020-03-08 07:58:58 +02:00 • committed by Andreas Kling
parent a96bf2c22e
commit b6307beb6e
2 changed files with 47 additions and 0 deletions
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23
Libraries/LibJS/AST.cpp
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@ -61,6 +61,16 @@ Value ReturnStatement::execute(Interpreter& interpreter) const
return value;
}
Value IfStatement::execute(Interpreter& interpreter) const
{
auto predicate_result = m_predicate->execute(interpreter);
if (predicate_result.as_bool())
return interpreter.run(*m_consequent);
else
return interpreter.run(*m_alternate);
}
Value add(Value lhs, Value rhs)
{
ASSERT(lhs.is_number());
@ -236,4 +246,17 @@ void ReturnStatement::dump(int indent) const
argument().dump(indent + 1);
}
void IfStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
printf("If\n");
predicate().dump(indent + 1);
consequent().dump(indent + 1);
print_indent(indent);
printf("Else\n");
alternate().dump(indent + 1);
}
}