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use crate::rule_prelude::*;
use ast::VarDecl;
use SyntaxKind::*;
declare_lint! {
#[serde(default)]
NoInnerDeclarations,
errors,
"no-inner-declarations",
pub disallowed: Vec<String>
}
impl Default for NoInnerDeclarations {
fn default() -> Self {
Self {
disallowed: vec!["functions".to_string()],
}
}
}
impl NoInnerDeclarations {
pub fn disallow_all() -> Self {
Self {
disallowed: vec!["functions".to_string(), "variables".to_string()],
}
}
}
const VALID_BLOCK_PARENT: [SyntaxKind; 3] = [FN_DECL, FN_EXPR, ARROW_EXPR];
const VALID_PARENT: [SyntaxKind; 5] = [
SCRIPT,
MODULE,
EXPORT_NAMED,
EXPORT_DEFAULT_DECL,
EXPORT_DECL,
];
#[typetag::serde]
impl CstRule for NoInnerDeclarations {
fn check_node(&self, node: &SyntaxNode, ctx: &mut RuleCtx) -> Option<()> {
if node.kind() == FN_DECL && self.disallowed.contains(&"functions".to_string())
|| node.kind() == VAR_DECL && self.disallowed.contains(&"variables".to_string())
{
let parent = node.parent()?;
if node.kind() == VAR_DECL && parent.kind() == FOR_STMT_INIT {
return None;
}
if let Some(decl) = node.try_to::<VarDecl>() {
if decl.is_const() || decl.is_let() {
return None;
}
}
if parent.kind() == BLOCK_STMT
&& parent
.parent()
.map_or(false, |parent| VALID_BLOCK_PARENT.contains(&parent.kind()))
{
return None;
}
if VALID_PARENT.contains(&parent.kind()) {
return None;
}
let enclosing = util::outer_function(node);
let second_part = if let Some(ref function) = enclosing {
function
.child_with_kind(NAME)
.map_or("enclosing function's body".to_string(), |name| {
format!("{}'s body", name.text().to_string())
})
} else {
"program's root".to_string()
};
let message = if node.kind() == VAR_DECL {
format!("move this variable declaration to {}", second_part)
} else {
format!("move this function declaration to {}", second_part)
};
let mut err = ctx.err(self.name(), message).primary(node, "");
if let Some(function) = enclosing {
err = err.secondary(
function,
"move the declaration to the body of this function",
);
} else {
err = err.footer_help("move the declaration to the program root");
}
ctx.add_err(err);
}
None
}
}
rule_tests! {
NoInnerDeclarations::default(),
err: {
"if (test) { function doSomething() { } }",
"if (foo) function f(){} ",
"function bar() { if (foo) function f(){}; }",
"function doSomething() { do { function somethingElse() { } } while (test); }",
"(function() { if (test) { function doSomething() { } } }());",
"if (foo){ function f(){ if(bar){ var a; } } }",
"if (foo) function f(){ if(bar) var a; } "
},
ok: {
"function doSomething() { }",
"if (test) { let x = 1; }",
"if (test) { const x = 1; }",
"export const foo = [];
export function bar() {}"
}
}