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-rw-r--r--crates/syntax/src/ast/edit_in_place.rs32
-rw-r--r--crates/syntax/src/ted.rs49
2 files changed, 58 insertions, 23 deletions
diff --git a/crates/syntax/src/ast/edit_in_place.rs b/crates/syntax/src/ast/edit_in_place.rs
index 1788f2a40..7adfe5e16 100644
--- a/crates/syntax/src/ast/edit_in_place.rs
+++ b/crates/syntax/src/ast/edit_in_place.rs
@@ -8,7 +8,7 @@ use parser::T;
8use crate::{ 8use crate::{
9 ast, 9 ast,
10 ted::{self, Position}, 10 ted::{self, Position},
11 AstNode, Direction, SyntaxKind, 11 AstNode, Direction, SyntaxElement,
12}; 12};
13 13
14use super::NameOwner; 14use super::NameOwner;
@@ -27,7 +27,7 @@ impl GenericParamsOwnerEdit for ast::Fn {
27 } else { 27 } else {
28 Position::last_child_of(self.syntax().clone()) 28 Position::last_child_of(self.syntax().clone())
29 }; 29 };
30 create_where_clause(position, true) 30 create_where_clause(position)
31 } 31 }
32 self.where_clause().unwrap() 32 self.where_clause().unwrap()
33 } 33 }
@@ -41,7 +41,7 @@ impl GenericParamsOwnerEdit for ast::Impl {
41 } else { 41 } else {
42 Position::last_child_of(self.syntax().clone()) 42 Position::last_child_of(self.syntax().clone())
43 }; 43 };
44 create_where_clause(position, false) 44 create_where_clause(position)
45 } 45 }
46 self.where_clause().unwrap() 46 self.where_clause().unwrap()
47 } 47 }
@@ -55,7 +55,7 @@ impl GenericParamsOwnerEdit for ast::Trait {
55 } else { 55 } else {
56 Position::last_child_of(self.syntax().clone()) 56 Position::last_child_of(self.syntax().clone())
57 }; 57 };
58 create_where_clause(position, false) 58 create_where_clause(position)
59 } 59 }
60 self.where_clause().unwrap() 60 self.where_clause().unwrap()
61 } 61 }
@@ -77,7 +77,7 @@ impl GenericParamsOwnerEdit for ast::Struct {
77 } else { 77 } else {
78 Position::last_child_of(self.syntax().clone()) 78 Position::last_child_of(self.syntax().clone())
79 }; 79 };
80 create_where_clause(position, true) 80 create_where_clause(position)
81 } 81 }
82 self.where_clause().unwrap() 82 self.where_clause().unwrap()
83 } 83 }
@@ -93,21 +93,16 @@ impl GenericParamsOwnerEdit for ast::Enum {
93 } else { 93 } else {
94 Position::last_child_of(self.syntax().clone()) 94 Position::last_child_of(self.syntax().clone())
95 }; 95 };
96 create_where_clause(position, true) 96 create_where_clause(position)
97 } 97 }
98 self.where_clause().unwrap() 98 self.where_clause().unwrap()
99 } 99 }
100} 100}
101 101
102fn create_where_clause(position: Position, after: bool) { 102fn create_where_clause(position: Position) {
103 let mut elements = vec![make::where_clause(empty()).clone_for_update().syntax().clone().into()]; 103 let where_clause: SyntaxElement =
104 let ws = make::tokens::single_space().into(); 104 make::where_clause(empty()).clone_for_update().syntax().clone().into();
105 if after { 105 ted::insert_ws(position, where_clause);
106 elements.insert(0, ws)
107 } else {
108 elements.push(ws)
109 }
110 ted::insert_all(position, elements);
111} 106}
112 107
113impl ast::WhereClause { 108impl ast::WhereClause {
@@ -117,12 +112,7 @@ impl ast::WhereClause {
117 ted::append_child(self.syntax().clone(), make::token(T![,])); 112 ted::append_child(self.syntax().clone(), make::token(T![,]));
118 } 113 }
119 } 114 }
120 if self.syntax().children_with_tokens().last().map(|it| it.kind()) 115 ted::append_child_ws(self.syntax().clone(), predicate.syntax().clone())
121 != Some(SyntaxKind::WHITESPACE)
122 {
123 ted::append_child(self.syntax().clone(), make::tokens::single_space());
124 }
125 ted::append_child(self.syntax().clone(), predicate.syntax().clone())
126 } 116 }
127} 117}
128 118
diff --git a/crates/syntax/src/ted.rs b/crates/syntax/src/ted.rs
index 8d6175ed9..f2166bbd3 100644
--- a/crates/syntax/src/ted.rs
+++ b/crates/syntax/src/ted.rs
@@ -1,8 +1,9 @@
1//! Primitive tree editor, ed for trees 1//! Primitive tree editor, ed for trees
2#![allow(unused)]
3use std::ops::RangeInclusive; 2use std::ops::RangeInclusive;
4 3
5use crate::{SyntaxElement, SyntaxNode}; 4use parser::T;
5
6use crate::{ast::make, SyntaxElement, SyntaxKind, SyntaxNode, SyntaxToken};
6 7
7#[derive(Debug)] 8#[derive(Debug)]
8pub struct Position { 9pub struct Position {
@@ -42,9 +43,25 @@ impl Position {
42 } 43 }
43} 44}
44 45
46pub fn insert_ws(position: Position, elem: impl Into<SyntaxElement>) {
47 insert_all_ws(position, vec![elem.into()])
48}
45pub fn insert(position: Position, elem: impl Into<SyntaxElement>) { 49pub fn insert(position: Position, elem: impl Into<SyntaxElement>) {
46 insert_all(position, vec![elem.into()]) 50 insert_all(position, vec![elem.into()])
47} 51}
52pub fn insert_all_ws(position: Position, mut elements: Vec<SyntaxElement>) {
53 if let Some(first) = elements.first() {
54 if let Some(ws) = ws_before(&position, first) {
55 elements.insert(0, ws.into())
56 }
57 }
58 if let Some(last) = elements.last() {
59 if let Some(ws) = ws_after(&position, last) {
60 elements.push(ws.into())
61 }
62 }
63 insert_all(position, elements)
64}
48pub fn insert_all(position: Position, elements: Vec<SyntaxElement>) { 65pub fn insert_all(position: Position, elements: Vec<SyntaxElement>) {
49 let (parent, index) = match position.repr { 66 let (parent, index) = match position.repr {
50 PositionRepr::FirstChild(parent) => (parent, 0), 67 PositionRepr::FirstChild(parent) => (parent, 0),
@@ -72,7 +89,35 @@ pub fn replace_all(range: RangeInclusive<SyntaxElement>, new: Vec<SyntaxElement>
72 parent.splice_children(start..end + 1, new) 89 parent.splice_children(start..end + 1, new)
73} 90}
74 91
92pub fn append_child_ws(node: impl Into<SyntaxNode>, child: impl Into<SyntaxElement>) {
93 let position = Position::last_child_of(node);
94 insert_ws(position, child)
95}
75pub fn append_child(node: impl Into<SyntaxNode>, child: impl Into<SyntaxElement>) { 96pub fn append_child(node: impl Into<SyntaxNode>, child: impl Into<SyntaxElement>) {
76 let position = Position::last_child_of(node); 97 let position = Position::last_child_of(node);
77 insert(position, child) 98 insert(position, child)
78} 99}
100
101fn ws_before(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
102 let prev = match &position.repr {
103 PositionRepr::FirstChild(_) => return None,
104 PositionRepr::After(it) => it,
105 };
106 ws_between(prev, new)
107}
108fn ws_after(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
109 let next = match &position.repr {
110 PositionRepr::FirstChild(parent) => parent.first_child_or_token()?,
111 PositionRepr::After(sibling) => sibling.next_sibling_or_token()?,
112 };
113 ws_between(new, &next)
114}
115fn ws_between(left: &SyntaxElement, right: &SyntaxElement) -> Option<SyntaxToken> {
116 if left.kind() == SyntaxKind::WHITESPACE || right.kind() == SyntaxKind::WHITESPACE {
117 return None;
118 }
119 if right.kind() == T![;] || right.kind() == T![,] {
120 return None;
121 }
122 Some(make::tokens::single_space().into())
123}