use crate::config::ConfigOption;
use crate::linter::{SyntaxRule, SyntaxRuleResult};
use regex::Regex;
use sv_parser::{NodeEvent, RefNode, SyntaxTree, WhiteSpace};
#[derive(Default)]
pub struct StyleTrailingwhitespace {
re: Option<Regex>,
buffer: String,
}
impl SyntaxRule for StyleTrailingwhitespace {
fn check(
&mut self,
syntax_tree: &SyntaxTree,
event: &NodeEvent,
_option: &ConfigOption,
) -> SyntaxRuleResult {
if self.re.is_none() {
self.re = Some(Regex::new(r"[ \t]+[\n\v\f\r]").unwrap());
}
let node = match event {
NodeEvent::Enter(n) => {
match n {
RefNode::WhiteSpace(WhiteSpace::Comment(_)) |
RefNode::WhiteSpace(WhiteSpace::Newline(_)) |
RefNode::WhiteSpace(WhiteSpace::Space(_)) => {
let last_char: Option<char> = self.buffer.pop();
self.buffer.clear();
if let Some(c) = last_char {
self.buffer.push(c);
}
}
RefNode::Comment(_) |
RefNode::Locate(_) => {
}
_ => {
self.buffer.clear();
}
}
match n {
RefNode::WhiteSpace(WhiteSpace::Space(x)) => {
self.buffer.push_str(syntax_tree.get_str(x).unwrap());
}
RefNode::WhiteSpace(WhiteSpace::Newline(x)) => {
self.buffer.push_str(syntax_tree.get_str(x).unwrap());
}
RefNode::WhiteSpace(WhiteSpace::Comment(x)) => {
self.buffer.push_str(syntax_tree.get_str(x).unwrap());
}
_ => {}
}
n
}
NodeEvent::Leave(_) => {
return SyntaxRuleResult::Pass;
}
};
match node {
RefNode::WhiteSpace(_) => {
let re = self.re.as_ref().unwrap();
if re.is_match(&self.buffer) {
SyntaxRuleResult::Fail
} else {
SyntaxRuleResult::Pass
}
}
_ => SyntaxRuleResult::Pass,
}
}
fn name(&self) -> String {
String::from("style_trailingwhitespace")
}
fn hint(&self, _option: &ConfigOption) -> String {
String::from("Remove trailing whitespace.")
}
fn reason(&self) -> String {
String::from("Trailing whitespace leads to unnecessary awkwardness with version control.")
}
}