bjoernager/rust
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syntax: Add #[deriving(FromPrimitive)] syntax extension

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Right now this only works for c-style enums.
This commit is contained in:
Erick Tryzelaar 2013-09-16 21:12:18 -07:00
parent d9d1dfc195
commit 0feaccf526
6 changed files with 190 additions and 0 deletions
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27
src/libsyntax/ext/build.rs
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@ -113,6 +113,7 @@ pub trait AstBuilder {
expr: @ast::Expr, ident: ast::Ident,
args: ~[@ast::Expr]) -> @ast::Expr;
fn expr_block(&self, b: ast::Block) -> @ast::Expr;
fn expr_cast(&self, sp: Span, expr: @ast::Expr, ty: ast::Ty) -> @ast::Expr;
fn field_imm(&self, span: Span, name: Ident, e: @ast::Expr) -> ast::Field;
fn expr_struct(&self, span: Span, path: ast::Path, fields: ~[ast::Field]) -> @ast::Expr;
@ -132,6 +133,9 @@ pub trait AstBuilder {
fn expr_str(&self, sp: Span, s: @str) -> @ast::Expr;
fn expr_str_uniq(&self, sp: Span, s: @str) -> @ast::Expr;
fn expr_some(&self, sp: Span, expr: @ast::Expr) -> @ast::Expr;
fn expr_none(&self, sp: Span) -> @ast::Expr;
fn expr_unreachable(&self, span: Span) -> @ast::Expr;
fn pat(&self, span: Span, pat: ast::Pat_) -> @ast::Pat;
@ -564,6 +568,29 @@ impl AstBuilder for @ExtCtxt {
}
fn expr_cast(&self, sp: Span, expr: @ast::Expr, ty: ast::Ty) -> @ast::Expr {
self.expr(sp, ast::ExprCast(expr, ty))
}
fn expr_some(&self, sp: Span, expr: @ast::Expr) -> @ast::Expr {
let some = ~[
self.ident_of("std"),
self.ident_of("option"),
self.ident_of("Some"),
];
self.expr_call_global(sp, some, ~[expr])
}
fn expr_none(&self, sp: Span) -> @ast::Expr {
let none = self.path_global(sp, ~[
self.ident_of("std"),
self.ident_of("option"),
self.ident_of("None"),
]);
self.expr_path(none)
}
fn expr_unreachable(&self, span: Span) -> @ast::Expr {
let loc = self.codemap().lookup_char_pos(span.lo);
self.expr_call_global(