wat_service 0.3.1

use crate::helpers;
use line_index::LineIndex;
use lsp_types::{Diagnostic, DiagnosticSeverity, NumberOrString};
use wat_syntax::{SyntaxKind, SyntaxNode};

const DIAGNOSTIC_CODE: &str = "import-occurrence";

pub fn check(diags: &mut Vec<Diagnostic>, line_index: &LineIndex, node: &SyntaxNode) {
    if node
        .prev_sibling()
        .is_some_and(|prev| prev.kind() != SyntaxKind::MODULE_FIELD_IMPORT)
    {
        diags.push(Diagnostic {
            range: helpers::rowan_range_to_lsp_range(line_index, node.text_range()),
            severity: Some(DiagnosticSeverity::ERROR),
            source: Some("wat".into()),
            code: Some(NumberOrString::String(DIAGNOSTIC_CODE.into())),
            message: "import must occur before all non-import definitions".into(),
            ..Default::default()
        });
    }
}