luaur-analysis 0.1.3

Luau type checker and type inference (Rust).
Documentation 
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use crate::functions::emit_warning::emit_warning;
use crate::records::lint_duplicate_local::LintDuplicateLocal;
use luaur_ast::records::ast_node::AstNode;
use luaur_ast::records::ast_stat_local::AstStatLocal;
use luaur_config::enums::code::Code;

impl LintDuplicateLocal {
    pub fn visit_ast_stat_local(&mut self, node: *mut AstStatLocal) -> bool {
        unsafe {
            let node_ref = &*node;

            // early out for performance
            if node_ref.vars.size == 1 {
                return true;
            }

            for i in 0..node_ref.vars.size {
                let var = *node_ref.vars.data.add(i);
                *self.locals.get_or_insert(var) = node as *mut AstNode;
            }

            for i in 0..node_ref.vars.size {
                let local = *node_ref.vars.data.add(i);
                let local_ref = &*local;

                if !local_ref.shadow.is_null()
                    && self.locals.find(&local_ref.shadow).copied() == Some(node as *mut AstNode)
                    && !self.ignore_duplicate(local)
                {
                    let shadow = &*local_ref.shadow;

                    if shadow.location.begin.line == local_ref.location.begin.line {
                        emit_warning(
                            &mut *self.context,
                            Code::Code_DuplicateLocal,
                            local_ref.location,
                            format_args!(
                                "Variable '{}' already defined on column {}",
                                name_str(local_ref.name.value),
                                shadow.location.begin.column + 1
                            ),
                        );
                    } else {
                        emit_warning(
                            &mut *self.context,
                            Code::Code_DuplicateLocal,
                            local_ref.location,
                            format_args!(
                                "Variable '{}' already defined on line {}",
                                name_str(local_ref.name.value),
                                shadow.location.begin.line + 1
                            ),
                        );
                    }
                }
            }
        }

        true
    }
}

fn name_str(value: *const core::ffi::c_char) -> alloc::borrow::Cow<'static, str> {
    if value.is_null() {
        alloc::borrow::Cow::Borrowed("")
    } else {
        unsafe { core::ffi::CStr::from_ptr(value).to_string_lossy() }
    }
}