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-rw-r--r--crates/ra_hir/src/lib.rs12
1 files changed, 12 insertions, 0 deletions
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index 9f59d590c..585217b7c 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -4,6 +4,18 @@
4//! The principal difference between HIR and syntax trees is that HIR is bound 4//! The principal difference between HIR and syntax trees is that HIR is bound
5//! to a particular crate instance. That is, it has cfg flags and features 5//! to a particular crate instance. That is, it has cfg flags and features
6//! applied. So, the relation between syntax and HIR is many-to-one. 6//! applied. So, the relation between syntax and HIR is many-to-one.
7//!
8//! HIR is the public API of the all of the compiler logic above syntax trees.
9//! It is written in "OO" style. Each type is self contained (as in, it knows it's
10//! parents and full context). It should be "clean code".
11//!
12//! `ra_hir_*` crates are the implementation of the compiler logic.
13//! They are written in "ECS" style, with relatively little abstractions.
14//! Many types are not self-contained, and explicitelly use local indexes, arenas, etc.
15//!
16//! `ra_hir` is what insulates the "we don't know how to actually write an incremental compiler"
17//! from the ide with completions, hovers, etc. It is a (soft, internal) boundary:
18//! https://www.tedinski.com/2018/02/06/system-boundaries.html.
7 19
8#![recursion_limit = "512"] 20#![recursion_limit = "512"]
9 21