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

use super::IRGeneratingContext;
use crate::{
    ast,
    utility::{data_type, data_type::Type, parsing},
};
use nom::{
    bytes::complete::tag,
    character::complete::multispace0,
    combinator::map,
    multi::separated_list0,
    sequence::{delimited, tuple},
    IResult,
};
use serde::{Deserialize, Serialize};
use std::{collections::HashMap, fmt};

/// [`TypeDefinition`] represents definition of a struct.
#[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
pub struct TypeDefinition {
    pub name: String,
    pub fields: Vec<Type>,
}

impl fmt::Display for TypeDefinition {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(f, "%{} = {{", self.name)?;
        for tyoe in &self.fields {
            writeln!(f, "    {tyoe},")?;
        }
        writeln!(f, "}}")
    }
}

/// Parse ir code to get a [`TypeDefinition`].
pub fn parse(code: &str) -> IResult<&str, TypeDefinition> {
    map(
        tuple((
            tag("%"),
            parsing::ident,
            multispace0,
            tag("="),
            multispace0,
            tag("type"),
            multispace0,
            delimited(
                parsing::in_multispace(tag("{")),
                separated_list0(parsing::in_multispace(tag(",")), data_type::parse),
                parsing::in_multispace(tag("}")),
            ),
        )),
        |(_, name, _, _, _, _, _, fields)| TypeDefinition { name, fields },
    )(code)
}

/// Map field name to its index.
#[derive(Debug)]
pub struct TypeDefinitionMapping {
    pub field_names: HashMap<String, usize>,
    pub field_types: Vec<Type>,
}

/// Generate ir code from a [`TypeDefinition`].
pub fn from_ast(
    ast: &ast::type_definition::TypeDefinition,
    ctx: &mut IRGeneratingContext,
) -> TypeDefinition {
    let ast::type_definition::TypeDefinition { name, fields } = ast;
    let mut field_names = HashMap::new();
    let mut field_types = Vec::new();
    for (i, field) in ast.fields.iter().enumerate() {
        field_names.insert(field.name.clone(), i);
        field_types.push(field.data_type.clone());
    }
    ctx.type_definitions.insert(
        name.clone(),
        TypeDefinitionMapping {
            field_names,
            field_types,
        },
    );
    TypeDefinition {
        name: name.clone(),
        fields: fields.iter().map(|field| field.data_type.clone()).collect(),
    }
}

// todo: tests