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Port keywordp to rust #334

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merged 2 commits into from Oct 5, 2017
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@@ -200,6 +200,14 @@ pub blv: *mut c_void, // @TODO implement Lisp_Buffer_Local_Value
pub fwd: *mut c_void, // @TODO implement Lisp_Fwd
}

/// Interned state of a symbol.
#[repr(C)]
pub enum Symbol_Interned {
Uninterned = 0,
Interned = 1,
InternedInInitialObarray = 2,
}

/// This struct has 4 bytes of padding, representing the bitfield that
/// lives at the top of a Lisp_Symbol. The first 10 bits of this field are
/// used.
@@ -143,6 +143,7 @@ pub use symbols::Fsymbol_name;
pub use symbols::Ffboundp;
pub use symbols::Fsymbol_function;
pub use symbols::Fsymbol_plist;
pub use symbols::Fkeywordp;
pub use strings::Fstring_equal;
pub use strings::Fstring_as_multibyte;
pub use strings::Fstring_to_multibyte;
@@ -280,6 +281,7 @@ pub extern "C" fn rust_init_syms() {
defsubr(&*symbols::Ssymbol_plist);
defsubr(&*symbols::Ssetplist);
defsubr(&*symbols::Sfmakunbound);
defsubr(&*symbols::Skeywordp);
defsubr(&*lists::Sconsp);
defsubr(&*lists::Ssetcar);
defsubr(&*lists::Ssetcdr);
@@ -104,6 +104,11 @@ impl LispStringRef {
pub fn as_mut_slice(&self) -> &mut [u8] {
unsafe { slice::from_raw_parts_mut(self.data as *mut u8, self.len_bytes() as usize) }
}

#[inline]
pub fn byte_at(&self, index: ptrdiff_t) -> u8 {
unsafe { *self.const_data_ptr().offset(index) }
}
}

pub struct LispStringRefIterator<'a> {
@@ -1,9 +1,11 @@
use remacs_macros::lisp_fn;
use lisp::{LispObject, ExternalPtr};
use remacs_sys::{Lisp_Symbol, Qsetting_constant};
use remacs_sys::{Lisp_Symbol, Symbol_Interned, Qsetting_constant};

pub type LispSymbolRef = ExternalPtr<Lisp_Symbol>;

const FLAG_INTERNED: u32 = 0b11 << 6; // 7 and 8 bits

impl LispSymbolRef {
pub fn symbol_name(&self) -> LispObject {
LispObject::from_raw(self.name)
@@ -24,6 +26,11 @@ impl LispSymbolRef {
pub fn set_function(&mut self, function: LispObject) {
self.function = function.to_raw();
}

pub fn is_interned_in_initial_obarray(&self) -> bool {
self.symbol_bitfield & FLAG_INTERNED ==
(Symbol_Interned::InternedInInitialObarray as u32) << 6
}
}

/// Return t if OBJECT is a symbol.
@@ -81,3 +88,22 @@ fn fmakunbound(symbol: LispObject) -> LispObject {
sym.set_function(LispObject::constant_nil());
symbol
}


// Define this in Rust to avoid unnecessarily consing up the symbol
// name.

/// Return t if OBJECT is a keyword.
/// This means that it is a symbol with a print name beginning with `:'
/// interned in the initial obarray.
#[lisp_fn]
fn keywordp(object: LispObject) -> LispObject {
if let Some(sym) = object.as_symbol() {
let name = sym.symbol_name().as_string_or_error();
LispObject::from_bool(
name.byte_at(0) == b':' && sym.is_interned_in_initial_obarray(),
)
} else {
LispObject::constant_nil()
}
}
@@ -273,21 +273,6 @@ for example, (type-of 1) returns `integer'. */)
}
}

/* Define this in C to avoid unnecessarily consing up the symbol
name. */
DEFUN ("keywordp", Fkeywordp, Skeywordp, 1, 1, 0,
doc: /* Return t if OBJECT is a keyword.
This means that it is a symbol with a print name beginning with `:'
interned in the initial obarray. */)
(Lisp_Object object)
{
if (SYMBOLP (object)
&& SREF (SYMBOL_NAME (object), 0) == ':'
&& SYMBOL_INTERNED_IN_INITIAL_OBARRAY_P (object))
return Qt;
return Qnil;
}

#ifdef HAVE_MODULES
DEFUN ("user-ptrp", Fuser_ptrp, Suser_ptrp, 1, 1, 0,
doc: /* Return t if OBJECT is a module user pointer. */)
@@ -2777,7 +2762,6 @@ syms_of_data (void)
defsubr (&Sindirect_variable);
defsubr (&Sinteractive_form);
defsubr (&Stype_of);
defsubr (&Skeywordp);
defsubr (&Smodule_function_p);
defsubr (&Sindirect_function);
defsubr (&Smakunbound);
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