use crate::config::ConfigOption;
use crate::linter::{SyntaxRule, SyntaxRuleResult};
use sv_parser::{unwrap_locate, unwrap_node, AlwaysKeyword, NodeEvent, RefNode, SyntaxTree};
#[derive(Default)]
pub struct SequentialBlockInAlwaysLatch;
impl SyntaxRule for SequentialBlockInAlwaysLatch {
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 (t, x) = &x.nodes;
match t {
AlwaysKeyword::AlwaysLatch(_) => {
if let Some(x) = unwrap_node!(x, SeqBlock) {
let loc = unwrap_locate!(x.clone()).unwrap();
SyntaxRuleResult::FailLocate(*loc)
} else {
SyntaxRuleResult::Pass
}
}
_ => SyntaxRuleResult::Pass,
}
}
_ => SyntaxRuleResult::Pass,
}
}
fn name(&self) -> String {
String::from("sequential_block_in_always_latch")
}
fn hint(&self, _option: &ConfigOption) -> String {
String::from("Keywords `begin` and `end` are forbidden within `always_latch`.")
}
fn reason(&self) -> String {
String::from("Sequential blocks within `always_latch` may encourage overly-complex code.")
}
}