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Added check to ensure format macro only being handled, refactored extraction and checks to smaller functions.

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This commit is contained in:
Donald Robertson 2018-06-06 16:53:11 +01:00
parent 451fd5feb9
commit e67d2b2663
1 changed files with 47 additions and 35 deletions
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82
clippy_lints/src/methods.rs
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@ -7,8 +7,8 @@ use std::fmt;
use std::iter;
use syntax::ast;
use syntax::codemap::{Span, BytePos};
use crate::utils::{get_arg_name, get_trait_def_id, implements_trait, in_external_macro, in_macro, is_copy, is_self, is_self_ty,
iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method,
use crate::utils::{get_arg_name, get_trait_def_id, implements_trait, in_external_macro, in_macro, is_copy, is_expn_of, is_self,
is_self_ty, iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method,
match_type, method_chain_args, match_var, return_ty, remove_blocks, same_tys, single_segment_path, snippet,
span_lint, span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty, walk_ptrs_ty_depth};
use crate::utils::paths;
@ -994,6 +994,34 @@ fn lint_or_fun_call(cx: &LateContext, expr: &hir::Expr, method_span: Span, name:
/// Checks for the `EXPECT_FUN_CALL` lint.
fn lint_expect_fun_call(cx: &LateContext, expr: &hir::Expr, method_span: Span, name: &str, args: &[hir::Expr]) {
fn extract_format_args(arg: &hir::Expr) -> Option<&hir::HirVec<hir::Expr>> {
if let hir::ExprAddrOf(_, ref addr_of) = arg.node {
if let hir::ExprCall(ref inner_fun, ref inner_args) = addr_of.node {
if let Some(_) = is_expn_of(inner_fun.span, "format") {
if inner_args.len() == 1 {
if let hir::ExprCall(_, ref format_args) = inner_args[0].node {
return Some(format_args);
}
}
}
}
}
None
}
fn generate_format_arg_snippet(cx: &LateContext, a: &hir::Expr) -> String {
if let hir::ExprAddrOf(_, ref format_arg) = a.node {
if let hir::ExprMatch(ref format_arg_expr, _, _) = format_arg.node {
if let hir::ExprTup(ref format_arg_expr_tup) = format_arg_expr.node {
return snippet(cx, format_arg_expr_tup[0].span, "..").into_owned();
}
}
};
snippet(cx, a.span, "..").into_owned()
}
fn check_general_case(
cx: &LateContext,
name: &str,
@ -1024,42 +1052,26 @@ fn lint_expect_fun_call(cx: &LateContext, expr: &hir::Expr, method_span: Span, n
let closure = if match_type(cx, self_type, &paths::OPTION) { "||" } else { "|_|" };
let span_replace_word = method_span.with_hi(span.hi());
if let hir::ExprAddrOf(_, ref addr_of) = arg.node {
if let hir::ExprCall(ref _inner_fun, ref inner_args) = addr_of.node {
// TODO: check if inner_fun is call to format!
if inner_args.len() == 1 {
if let hir::ExprCall(_, ref format_args) = inner_args[0].node {
let args_len = format_args.len();
let args: Vec<String> = format_args
.into_iter()
.take(args_len - 1)
.map(|a| {
if let hir::ExprAddrOf(_, ref format_arg) = a.node {
if let hir::ExprMatch(ref format_arg_expr, _, _) = format_arg.node {
if let hir::ExprTup(ref format_arg_expr_tup) = format_arg_expr.node {
return snippet(cx, format_arg_expr_tup[0].span, "..").into_owned();
}
}
};
snippet(cx, a.span, "..").into_owned()
})
.collect();
if let Some(format_args) = extract_format_args(arg) {
let args_len = format_args.len();
let args: Vec<String> = format_args
.into_iter()
.take(args_len - 1)
.map(|a| generate_format_arg_snippet(cx, a))
.collect();
let sugg = args.join(", ");
let sugg = args.join(", ");
span_lint_and_sugg(
cx,
EXPECT_FUN_CALL,
span_replace_word,
&format!("use of `{}` followed by a function call", name),
"try this",
format!("unwrap_or_else({} panic!({}))", closure, sugg),
);
span_lint_and_sugg(
cx,
EXPECT_FUN_CALL,
span_replace_word,
&format!("use of `{}` followed by a function call", name),
"try this",
format!("unwrap_or_else({} panic!({}))", closure, sugg),
);
return;
}
}
}
return;
}
let sugg: Cow<_> = snippet(cx, arg.span, "..");