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// Functions for building ASTs, without having to fuss with spans.
//
// To start with, it will be use dummy spans, but it might someday do
// something smarter.
import ast::{ident, node_id};
import codemap::span;
import ext::base::mk_ctxt;
fn ident(s: str) -> ast::ident {
@(copy s)
}
fn empty_span() -> span {
{lo: 0, hi: 0, expn_info: none}
}
fn span<T>(+x: T) -> ast::spanned<T> {
{node: x,
span: empty_span()}
}
fn path(id: ident) -> @ast::path {
@{span: empty_span(),
global: false,
idents: ~[id],
rp: none,
types: ~[]}
}
impl methods for ident {
fn +(id: ident) -> @ast::path {
path(self) + id
}
}
impl methods for @ast::path {
fn +(id: ident) -> @ast::path {
@{idents: vec::append_one(self.idents, id)
with *self}
}
fn add_ty(ty: @ast::ty) -> @ast::path {
@{types: vec::append_one(self.types, ty)
with *self}
}
fn add_tys(+tys: ~[@ast::ty]) -> @ast::path {
@{types: vec::append(self.types, tys)
with *self}
}
}
impl ast_builder for ext_ctxt {
fn ty_param(id: ast::ident, +bounds: ~[ast::ty_param_bound])
-> ast::ty_param
{
{ident: id, id: self.next_id(), bounds: @bounds}
}
fn arg(name: ident, ty: @ast::ty) -> ast::arg {
{mode: ast::infer(self.next_id()),
ty: ty,
ident: name,
// TODO: should this be the same as the infer id?
id: self.next_id()}
}
fn arg_mode(name: ident, ty: @ast::ty, mode: ast::rmode) -> ast::arg {
{mode: ast::expl(mode),
ty: ty,
ident: name,
id: self.next_id()}
}
fn expr_block(e: @ast::expr) -> ast::blk {
let blk = {view_items: ~[],
stmts: ~[],
expr: some(e),
id: self.next_id(),
rules: ast::default_blk};
{node: blk,
span: empty_span()}
}
fn fn_decl(+inputs: ~[ast::arg],
output: @ast::ty) -> ast::fn_decl {
{inputs: inputs,
output: output,
purity: ast::impure_fn,
cf: ast::return_val,
// TODO: we'll probably want a variant that does constrained
// types.
constraints: ~[]}
}
fn item(name: ident,
+node: ast::item_) -> @ast::item {
@{ident: name,
attrs: ~[],
id: self.next_id(),
node: node,
vis: ast::public,
span: empty_span()}
}
fn item_fn_poly(name: ident,
+inputs: ~[ast::arg],
output: @ast::ty,
+ty_params: ~[ast::ty_param],
+body: ast::blk) -> @ast::item {
self.item(name,
ast::item_fn(self.fn_decl(inputs, output),
ty_params,
body))
}
fn item_fn(name: ident,
+inputs: ~[ast::arg],
output: @ast::ty,
+body: ast::blk) -> @ast::item {
self.item_fn_poly(name, inputs, output, ~[], body)
}
fn item_enum_poly(name: ident,
+variants: ~[ast::variant],
+ty_params: ~[ast::ty_param]) -> @ast::item {
self.item(name,
ast::item_enum(variants,
ty_params,
ast::rp_none))
}
fn item_enum(name: ident,
+variants: ~[ast::variant]) -> @ast::item {
self.item_enum_poly(name, variants, ~[])
}
fn variant(name: ident,
+tys: ~[@ast::ty]) -> ast::variant {
let args = tys.map(|ty| {ty: ty, id: self.next_id()});
span({name: name,
attrs: ~[],
args: args,
id: self.next_id(),
disr_expr: none,
vis: ast::public})
}
fn item_mod(name: ident,
+items: ~[@ast::item]) -> @ast::item {
self.item(name,
ast::item_mod({
view_items: ~[],
items: items}))
}
fn ty_path(path: @ast::path) -> @ast::ty {
// TODO: make sure the node ids are legal.
@{id: self.next_id(),
node: ast::ty_path(path, self.next_id()),
span: empty_span()}
}
fn item_ty_poly(name: ident,
ty: @ast::ty,
+params: ~[ast::ty_param]) -> @ast::item {
self.item(name,
ast::item_ty(ty, params, ast::rp_none))
}
fn item_ty(name: ident,
ty: @ast::ty) -> @ast::item {
self.item_ty_poly(name, ty, ~[])
}
fn ty_vars(+ty_params: ~[ast::ty_param]) -> ~[@ast::ty] {
ty_params.map(|p| self.ty_path(path(p.ident)))
}
}
|
