// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::rule_finder::StartMatch;
use rustc::hir::{self, HirId};
use std::collections::{HashMap, HashSet};
use std::vec::Vec;
use syntax::symbol::Symbol;
#[derive(Debug)]
pub(crate) struct Rule<'gcx, T: StartMatch> {
pub(crate) search: &'gcx T,
pub(crate) replace: &'gcx T,
// The method in which the rule is defined.
pub(crate) body_id: hir::BodyId,
// Maps from the names of declared variables (which must be unique within the search pattern) to
// their HirId. This is used to pair up variables in the search pattern with their counterparts
// in the replacement pattern. This is necessary since as far as rustc is concerned, they're
// completely unrelated definitions. It isn't needed for expression placeholders since they're
// declared as arguments to the function, so the search and replace pattern can both reference
// the same placeholder variable.
pub(crate) declared_name_hir_ids: HashMap<Symbol, HirId>,
// IDs of the arguments to the function in which the rule was declared. When references to these
// IDs are encountered in the search pattern, they should be treated as placeholders.
pub(crate) placeholder_ids: HashSet<HirId>,
}
#[derive(Debug)]
pub(crate) struct Rules<'gcx> {
pub(crate) expr_rules: Vec<Rule<'gcx, hir::Expr>>,
pub(crate) pattern_rules: Vec<Rule<'gcx, hir::Pat>>,
pub(crate) type_rules: Vec<Rule<'gcx, hir::Ty>>,
pub(crate) trait_ref_rules: Vec<Rule<'gcx, hir::TraitRef>>,
}
impl<'gcx> Rules<'gcx> {
pub(crate) fn new() -> Rules<'gcx> {
Rules {
expr_rules: Vec::new(),
pattern_rules: Vec::new(),
type_rules: Vec::new(),
trait_ref_rules: Vec::new(),
}
}
pub(crate) fn len(&self) -> usize {
self.expr_rules.len()
+ self.pattern_rules.len()
+ self.type_rules.len()
+ self.trait_ref_rules.len()
}
}