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Shell: Add 'if' expressions

Browse source 
```sh
if foo bar baz {
    quux
} else if foobar || whatever {
    echo I ran out of example words
} else {
    exit 2
}
```
This commit is contained in:
AnotherTest 2020-08-11 12:05:46 +04:30 • committed by Andreas Kling
parent c2be38e50f
commit b90eb5c9ba
4 changed files with 210 additions and 2 deletions
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102
Shell/AST.cpp
View file

@ -1119,6 +1119,108 @@ Execute::~Execute()
{
}
void IfCond::dump(int level) const
{
Node::dump(level);
print_indented("Condition", ++level);
m_condition->dump(level + 1);
print_indented("True Branch", level);
if (m_true_branch)
m_true_branch->dump(level + 1);
else
print_indented("(empty)", level + 1);
print_indented("False Branch", level);
if (m_false_branch)
m_false_branch->dump(level + 1);
else
print_indented("(empty)", level + 1);
}
RefPtr<Value> IfCond::run(RefPtr<Shell> shell)
{
auto cond = m_condition->run(shell)->resolve_without_cast(shell);
ASSERT(cond->is_job());
auto cond_job_value = static_cast<const JobValue*>(cond.ptr());
auto cond_job = cond_job_value->job();
shell->block_on_job(cond_job);
if (cond_job->signaled())
return create<ListValue>({}); // Exit early.
if (cond_job->exit_code() == 0) {
if (m_true_branch)
return m_true_branch->run(shell);
} else {
if (m_false_branch)
return m_false_branch->run(shell);
}
return create<ListValue>({});
}
void IfCond::highlight_in_editor(Line::Editor& editor, Shell& shell, HighlightMetadata metadata)
{
metadata.is_first_in_list = true;
editor.stylize({ m_position.start_offset, m_position.start_offset + 2 }, { Line::Style::Foreground(Line::Style::XtermColor::Yellow) });
if (m_else_position.has_value())
editor.stylize({ m_else_position.value().start_offset, m_else_position.value().start_offset + 4 }, { Line::Style::Foreground(Line::Style::XtermColor::Yellow) });
m_condition->highlight_in_editor(editor, shell, metadata);
if (m_true_branch)
m_true_branch->highlight_in_editor(editor, shell, metadata);
if (m_false_branch)
m_false_branch->highlight_in_editor(editor, shell, metadata);
}
HitTestResult IfCond::hit_test_position(size_t offset)
{
if (!position().contains(offset))
return {};
if (auto result = m_condition->hit_test_position(offset); result.matching_node)
return result;
if (m_true_branch) {
if (auto result = m_true_branch->hit_test_position(offset); result.matching_node)
return result;
}
if (m_false_branch) {
if (auto result = m_false_branch->hit_test_position(offset); result.matching_node)
return result;
}
return {};
}
IfCond::IfCond(Position position, Optional<Position> else_position, RefPtr<Node> condition, RefPtr<Node> true_branch, RefPtr<Node> false_branch)
: Node(move(position))
, m_condition(move(condition))
, m_true_branch(move(true_branch))
, m_false_branch(move(false_branch))
, m_else_position(move(else_position))
{
if (m_condition->is_syntax_error())
set_is_syntax_error(m_condition->syntax_error_node());
else if (m_true_branch && m_true_branch->is_syntax_error())
set_is_syntax_error(m_true_branch->syntax_error_node());
else if (m_false_branch && m_false_branch->is_syntax_error())
set_is_syntax_error(m_false_branch->syntax_error_node());
m_condition = create<AST::Execute>(m_condition->position(), m_condition);
if (m_true_branch)
m_true_branch = create<AST::Execute>(m_true_branch->position(), m_true_branch);
if (m_false_branch)
m_false_branch = create<AST::Execute>(m_false_branch->position(), m_false_branch);
}
IfCond::~IfCond()
{
}
void Join::dump(int level) const
{
Node::dump(level);