use crate::config::ConfigOption;
use crate::linter::{SyntaxRule, SyntaxRuleResult};
use sv_parser::{unwrap_locate, unwrap_node, AlwaysKeyword, NodeEvent, RefNode, SyntaxTree};
#[derive(Default)]
pub struct CaseDefault;
impl SyntaxRule for CaseDefault {
fn check(
&mut self,
_syntax_tree: &SyntaxTree,
event: &NodeEvent,
_option: &ConfigOption,
) -> SyntaxRuleResult {
let node = match event {
NodeEvent::Enter(x) => x,
NodeEvent::Leave(_) => {
return SyntaxRuleResult::Pass;
}
};
match node {
RefNode::AlwaysConstruct(x) => {
let (ref a, _) = x.nodes;
match a {
AlwaysKeyword::AlwaysComb(_) => {
if let Some(x) = unwrap_node!(*x, CaseStatementNormal) {
let loc = unwrap_locate!(x.clone()).unwrap();
let a = unwrap_node!(x, CaseItemDefault);
if a.is_some() {
SyntaxRuleResult::Pass
} else {
SyntaxRuleResult::FailLocate(*loc)
}
} else {
SyntaxRuleResult::Pass
}
}
_ => SyntaxRuleResult::Pass,
}
}
RefNode::FunctionDeclaration(x) => {
if let Some(x) = unwrap_node!(*x, CaseStatementNormal) {
let loc = unwrap_locate!(x.clone()).unwrap();
let a = unwrap_node!(x, CaseItemDefault);
if a.is_some() {
SyntaxRuleResult::Pass
} else {
SyntaxRuleResult::FailLocate(*loc)
}
} else {
SyntaxRuleResult::Pass
}
}
_ => SyntaxRuleResult::Pass,
}
}
fn name(&self) -> String {
String::from("case_default")
}
fn hint(&self, _option: &ConfigOption) -> String {
String::from("Use a `default` expression in `case` statements.")
}
fn reason(&self) -> String {
String::from("Incomplete case may cause simulation/synthesis mismatch in `always_comb` and `function`.")
}
}