1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
use libc::size_t; use std::mem; use std::convert::From; use types::{InternalValue, RBasic}; const SPECIAL_SHIFT: usize = 8; pub enum RubySpecialConsts { False = 0, True = 0x14, Nil = 0x08, Undef = 0x34, ImmediateMask = 0x07, FixnumFlag = 0x01, FlonumMask = 0x03, FlonumFlag = 0x02, SymbolFlag = 0x0c, } #[derive(Debug, PartialEq)] #[link_name = "ruby_value_type"] #[repr(C)] pub enum ValueType { None = 0x00, Object = 0x01, Class = 0x02, Module = 0x03, Float = 0x04, RString = 0x05, Regexp = 0x06, Array = 0x07, Hash = 0x08, Struct = 0x09, Bignum = 0x0a, File = 0x0b, Data = 0x0c, Match = 0x0d, Complex = 0x0e, Rational = 0x0f, Nil = 0x11, True = 0x12, False = 0x13, Symbol = 0x14, Fixnum = 0x15, Undef = 0x1b, Node = 0x1c, IClass = 0x1d, Zombie = 0x1e, Mask = 0x1f, } #[repr(C)] #[derive(Copy, Clone, Debug, PartialEq)] pub struct Value { pub value: InternalValue, } impl Value { pub fn is_true(&self) -> bool { self.value == (RubySpecialConsts::True as InternalValue) } pub fn is_false(&self) -> bool { self.value == (RubySpecialConsts::False as InternalValue) } pub fn is_nil(&self) -> bool { self.value == (RubySpecialConsts::Nil as InternalValue) } pub fn is_undef(&self) -> bool { self.value == (RubySpecialConsts::Undef as InternalValue) } pub fn is_symbol(&self) -> bool { (self.value & !((!0) << SPECIAL_SHIFT)) == (RubySpecialConsts::SymbolFlag as InternalValue) } pub fn is_fixnum(&self) -> bool { (self.value & (RubySpecialConsts::FixnumFlag as InternalValue)) != 0 } pub fn is_flonum(&self) -> bool { (self.value & (RubySpecialConsts::FlonumMask as InternalValue)) == (RubySpecialConsts::FlonumFlag as InternalValue) } pub fn ty(&self) -> ValueType { if self.is_immediate() { if self.is_fixnum() { ValueType::Fixnum } else if self.is_flonum() { ValueType::Float } else if self.is_true() { ValueType::True } else if self.is_symbol() { ValueType::Symbol } else if self.is_undef() { ValueType::Undef } else { self.builtin_type() } } else if !self.test() { if self.is_nil() { ValueType::Nil } else if self.is_false() { ValueType::False } else { self.builtin_type() } } else { self.builtin_type() } } fn is_immediate(&self) -> bool { (self.value & (RubySpecialConsts::ImmediateMask as InternalValue)) != 0 } fn test(&self) -> bool { (self.value & !(RubySpecialConsts::Nil as InternalValue)) != 0 } fn builtin_type(&self) -> ValueType { unsafe { let basic: *const RBasic = mem::transmute(self.value); let masked = (*basic).flags & (ValueType::Mask as size_t); mem::transmute(masked as u32) } } } impl From<InternalValue> for Value { fn from(internal_value: InternalValue) -> Self { Value { value: internal_value } } }