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use paste::paste;
use ra_ap_syntax::{
    ast::{self, AstNode},
    SyntaxKind, SyntaxNode,
};

pub(crate) const INTERNAL_ERR: &'static str =
    "Internal error message in rust-visitor. Please create an issue on https://github.com/pksunkara/cargo-up";

pub use ra_ap_syntax;

#[derive(Default, Debug)]
pub struct Options {
    skip_children: bool,
}

macro_rules! visiting {
    () => {};
    ($($kind:ident,)*) => {
        trait Visitable: Sized {
            fn accept<T: Visitor>(&self, visitor: &mut T);
        }

        impl Visitable for SyntaxNode {
            fn accept<T: Visitor>(&self, visitor: &mut T) {
                let mut options = Options::default();

                visitor.pre_visit(self);

                paste! {
                    match self.kind() {
                        $(SyntaxKind::$kind => visitor.[<visit_ $kind:lower>](
                            &ast::[<$kind:camel>]::cast((*self).clone()).expect(INTERNAL_ERR),
                            &mut options,
                        ),)*
                        _ => {},
                    };
                };

                if !options.skip_children {
                    for child in self.children() {
                        child.accept(visitor);
                    }
                }

                visitor.post_visit(self);
            }
        }

        pub trait Visitor: Sized {
            /// Call this method to perform a in-order traversal on `node` and its children.
            fn walk(&mut self, node: &SyntaxNode) {
                node.accept(self);
            }

            /// This method is called before visiting a node.
            fn pre_visit(&mut self, _node: &SyntaxNode) {}

            /// This method is called after visiting a node.
            fn post_visit(&mut self, _node: &SyntaxNode) {}

            paste! {
                $(
                    #[doc = " This method is called when visiting a `" $kind "` node."]
                    fn [<visit_ $kind:lower>](&mut self, _node: &ast::[<$kind:camel>], _options: &mut Options) {}
                )*
            }
        }
    };
}

visiting!(
    SOURCE_FILE,
    STRUCT,
    UNION,
    ENUM,
    FN,
    RET_TYPE,
    EXTERN_CRATE,
    MODULE,
    USE,
    STATIC,
    CONST,
    TRAIT,
    IMPL,
    TYPE_ALIAS,
    MACRO_CALL,
    TOKEN_TREE,
    PAREN_TYPE,
    TUPLE_TYPE,
    NEVER_TYPE,
    PATH_TYPE,
    PTR_TYPE,
    ARRAY_TYPE,
    SLICE_TYPE,
    REF_TYPE,
    INFER_TYPE,
    FN_PTR_TYPE,
    FOR_TYPE,
    IMPL_TRAIT_TYPE,
    DYN_TRAIT_TYPE,
    OR_PAT,
    PAREN_PAT,
    REF_PAT,
    BOX_PAT,
    IDENT_PAT,
    WILDCARD_PAT,
    REST_PAT,
    PATH_PAT,
    RECORD_PAT,
    RECORD_PAT_FIELD_LIST,
    RECORD_PAT_FIELD,
    TUPLE_STRUCT_PAT,
    TUPLE_PAT,
    SLICE_PAT,
    RANGE_PAT,
    LITERAL_PAT,
    MACRO_PAT,
    TUPLE_EXPR,
    ARRAY_EXPR,
    PAREN_EXPR,
    PATH_EXPR,
    CLOSURE_EXPR,
    IF_EXPR,
    WHILE_EXPR,
    CONDITION,
    LOOP_EXPR,
    FOR_EXPR,
    CONTINUE_EXPR,
    BREAK_EXPR,
    LABEL,
    BLOCK_EXPR,
    RETURN_EXPR,
    MATCH_EXPR,
    MATCH_ARM_LIST,
    MATCH_ARM,
    MATCH_GUARD,
    RECORD_EXPR,
    RECORD_EXPR_FIELD_LIST,
    RECORD_EXPR_FIELD,
    EFFECT_EXPR,
    BOX_EXPR,
    CALL_EXPR,
    INDEX_EXPR,
    METHOD_CALL_EXPR,
    FIELD_EXPR,
    AWAIT_EXPR,
    TRY_EXPR,
    CAST_EXPR,
    REF_EXPR,
    PREFIX_EXPR,
    RANGE_EXPR,
    BIN_EXPR,
    EXTERN_BLOCK,
    EXTERN_ITEM_LIST,
    VARIANT,
    RECORD_FIELD_LIST,
    RECORD_FIELD,
    TUPLE_FIELD_LIST,
    TUPLE_FIELD,
    VARIANT_LIST,
    ITEM_LIST,
    ASSOC_ITEM_LIST,
    ATTR,
    USE_TREE,
    USE_TREE_LIST,
    PATH,
    PATH_SEGMENT,
    LITERAL,
    RENAME,
    VISIBILITY,
    WHERE_CLAUSE,
    WHERE_PRED,
    ABI,
    NAME,
    NAME_REF,
    LET_STMT,
    EXPR_STMT,
    GENERIC_PARAM_LIST,
    GENERIC_PARAM,
    LIFETIME_PARAM,
    TYPE_PARAM,
    CONST_PARAM,
    GENERIC_ARG_LIST,
    LIFETIME_ARG,
    TYPE_ARG,
    ASSOC_TYPE_ARG,
    CONST_ARG,
    PARAM_LIST,
    PARAM,
    SELF_PARAM,
    ARG_LIST,
    TYPE_BOUND,
    TYPE_BOUND_LIST,
    MACRO_ITEMS,
    MACRO_STMTS,
);