1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

use core::fmt;
use std::fmt::Display;

use crate::{syntax_tree::SyntaxTree, token::Token, LocalSpan};

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub struct NodeId(pub(super) usize);

#[derive(Debug, PartialEq, Eq)]
pub struct Node {
    pub kind: NodeKind,
    pub span: LocalSpan,
    pub children: Box<[NodeChild]>,
}

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum NodeChild {
    Token(Token),
    Node(NodeId),
}

impl NodeChild {
    pub fn span(&self, ast: &SyntaxTree) -> LocalSpan {
        match self {
            NodeChild::Token(token) => token.span,
            NodeChild::Node(node) => ast[*node].span,
        }
    }
}

impl From<NodeId> for NodeChild {
    fn from(v: NodeId) -> Self {
        Self::Node(v)
    }
}

impl From<Token> for NodeChild {
    fn from(v: Token) -> Self {
        Self::Token(v)
    }
}

#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum NodeKind {
    Assignment,
    AttributeList,
    Block,
    Branch,
    BranchElse,
    ControlFlow,
    Error,
    FormatString,
    Function,
    FunctionPattern,
    FunctionPatternParams,
    Import,
    InfixOp,
    InfLoop,
    Module,
    ParamDeclaration,
    ParamListDeclaration,
    ParamList,
    ParensValue,
    Path,
    Pattern,
    PostfixOp,
    PrefixOp,
    Root,
    Statement,
    StructDef,
    StructLiteral,
    StructLiteralItem,
    StructVar,
    StructVariables,
    Tuple,
    Update,
    Value,
    WhileLoop,
}

impl fmt::Display for NodeKind {
    #[allow(clippy::use_debug)]
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{self:?}")
    }
}

pub struct NodeDisplay<'a> {
    pub(super) ast: &'a SyntaxTree,
    pub(super) source: &'a str,
    pub(super) node_id: NodeId,
    pub(super) indent: usize,
}

impl NodeDisplay<'_> {
    fn writeln(&self, f: &mut fmt::Formatter<'_>, value: impl Display) -> fmt::Result {
        Self::write_indented(f, value, self.indent)?;
        writeln!(f)
    }

    fn write_indented(
        f: &mut fmt::Formatter<'_>,
        value: impl Display,
        indent: usize,
    ) -> fmt::Result {
        write!(f, "{:indent$}{}", "", value, indent = indent * 2)
    }
}

impl fmt::Display for NodeDisplay<'_> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let node = &self.ast[self.node_id];
        // self.writeln(f, node.children.len())?;
        self.writeln(f, node.kind)?;

        for child in node.children.as_ref() {
            match child {
                NodeChild::Token(token) => {
                    Self::write_indented(f, "", self.indent + 1)?;
                    let src = &self.source[token.span.as_slice()].escape_default();
                    writeln!(f, "{token}: '{src}'")
                }
                NodeChild::Node(node_id) => fmt::Display::fmt(
                    &NodeDisplay {
                        ast: self.ast,
                        indent: self.indent + 1,
                        node_id: *node_id,
                        source: self.source,
                    },
                    f,
                ),
            }?;
        }

        Ok(())
    }
}