lisette-semantics 0.4.1

Little language inspired by Rust that compiles to Go
Documentation 
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

use super::helpers::span_text;
use crate::passes::walk::NodeCtx;
use syntax::ast::{Expression, Literal};

pub fn check_redundant_sprintf(expression: &Expression, ctx: &NodeCtx) {
    let Expression::Call {
        expression: callee,
        args,
        span,
        ..
    } = expression
    else {
        return;
    };

    let [format, value] = args.as_slice() else {
        return;
    };

    let Expression::Literal {
        literal: Literal::String {
            value: format_value,
            ..
        },
        ..
    } = format.unwrap_parens()
    else {
        return;
    };

    if format_value != "%s" {
        return;
    }

    let Expression::DotAccess {
        expression: namespace,
        member,
        ..
    } = callee.unwrap_parens()
    else {
        return;
    };

    if member.as_str() != "Sprintf" {
        return;
    }

    if namespace.get_type().as_import_namespace() != Some("go:fmt") {
        return;
    }

    if !value.get_type().is_string() {
        return;
    }

    let (Some(namespace_text), Some(value_text)) = (
        span_text(ctx.source, namespace),
        span_text(ctx.source, value),
    ) else {
        return;
    };

    ctx.sink.push(diagnostics::lint::redundant_sprintf(
        span,
        namespace_text,
        value_text,
    ));
}