nautilus-orm-schema 0.1.4

Schema parsing and validation for Nautilus ORM
Documentation 
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//! Goto-definition support for `.nautilus` schema files.

use super::{analyze, span_contains};
use crate::ast::{Declaration, FieldType, Schema};
use crate::span::Span;

/// Returns the span of the declaration that the symbol at `offset` refers to.
///
/// Handles:
/// - Field types of the form `UserType(name)` — resolves to the `ModelDecl`
///   or `EnumDecl` with that name.
///
/// Returns `None` if the offset does not sit on a resolvable reference.
pub fn goto_definition(source: &str, offset: usize) -> Option<Span> {
    let result = analyze(source);
    let ast = result.ast.as_ref()?;

    // Find fields whose span contains the offset and whose type is a UserType.
    for decl in &ast.declarations {
        if let Declaration::Model(model) = decl {
            for field in &model.fields {
                if span_contains(field.span, offset) {
                    if let FieldType::UserType(ref name) = field.field_type {
                        return find_declaration_span(ast, name);
                    }
                }
            }
        }
    }

    None
}

/// Find the span of a model or enum declaration with the given name.
fn find_declaration_span(ast: &Schema, name: &str) -> Option<Span> {
    for decl in &ast.declarations {
        match decl {
            Declaration::Model(m) if m.name.value == name => return Some(m.span),
            Declaration::Enum(e) if e.name.value == name => return Some(e.span),
            _ => {}
        }
    }
    None
}