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use reader::Read; use std::ptr; pub trait Symbol { fn len (&self) -> usize; fn len_chars (&self) -> usize; fn contained_at (&self, value: &[u8], index: usize) -> bool; fn same_as_slice (&self, &[u8]) -> bool; fn as_slice (&self) -> &[u8]; fn as_ptr (&self) -> *const u8; fn new_vec (&self) -> Vec<u8>; fn to_vec (self) -> Vec<u8>; fn read<Reader: Read> (&self, reader: &mut Reader) -> Option<usize> where Self: Sized { self.read_at (0, reader) } fn read_at<Reader: Read> (&self, at: usize, reader: &mut Reader) -> Option<usize> where Self: Sized { if reader.contains_at (self, at) { Some (self.len ()) } else { None } } unsafe fn copy_to_ptr (&self, dst: *mut u8) -> *mut u8 { let src = self.as_ptr (); let len = self.len (); ptr::copy_nonoverlapping (src, dst, len); dst.offset (len as isize) } unsafe fn copy_to_ptr_times (&self, mut dst: *mut u8, times: usize) -> *mut u8 { let src = self.as_ptr (); let len = self.len (); for _ in 0 .. times { ptr::copy_nonoverlapping (src, dst, len); dst = dst.offset (len as isize); } dst } } #[derive (Clone)] pub struct Char { dt: [u8; 9] } impl Char { pub fn new (src: &[u8]) -> Char { Char { dt: match src.len () { 1 => [src[0], 0, 0, 0, 0, 0, 0, 0, 1], 2 => [src[0], src[1], 0, 0, 0, 0, 0, 0, 2], 3 => [src[0], src[1], src[2], 0, 0, 0, 0, 0, 3], 4 => [src[0], src[1], src[2], src[3], 0, 0, 0, 0, 4], 5 => [src[0], src[1], src[2], src[3], src[4], 0, 0, 0, 5], 6 => [src[0], src[1], src[2], src[3], src[4], src[5], 0, 0, 6], 7 => [src[0], src[1], src[2], src[3], src[4], src[5], src[6], 0, 7], 8 => [src[0], src[1], src[2], src[3], src[4], src[5], src[6], src[7], 8], _ => panic! ("Invalid number of bytes for a Char: 0 > {} < 9", src.len ()) }} } pub fn new_word (&self) -> Word { Word::combine (&[self]) } pub fn to_word (self) -> Word { Word::combine (&[&self]) } } impl Symbol for Char { fn len (&self) -> usize { self.dt[8] as usize } fn len_chars (&self) -> usize { 1 } fn contained_at (&self, value: &[u8], index: usize) -> bool { value.len () >= index + self.len () && unsafe { let mut v = value.as_ptr ().offset (index as isize); let mut s = self.dt.as_ptr (); for _ in 0..self.len () { if *v != *s { return false; } v = v.offset (1); s = s.offset (1); } true } } fn as_slice (&self) -> &[u8] { &self.dt[0 .. self.len ()] } fn as_ptr (&self) -> *const u8 { self.dt.as_ptr () } fn same_as_slice (&self, src: &[u8]) -> bool { self.as_slice () == src } fn to_vec (self) -> Vec<u8> { self.new_vec () } fn new_vec (&self) -> Vec<u8> { let mut vec = Vec::with_capacity (self.len ()); vec.extend (self.as_slice ()); vec } } #[derive (Clone)] pub struct Word { dt: Vec<u8>, clen: usize } impl Word { pub fn empty () -> Word { Word { dt: Vec::with_capacity (0), clen: 0 } } pub fn combine (src: &[&Char]) -> Word { if src.len () == 0 { panic! ("Word length must be > 0") } let mut vlen: usize = 0; for idx in 0 .. src.len () { vlen += src[idx].len () } let mut vec = Vec::with_capacity (vlen); for i in 0 .. src.len () { vec.extend (src[i].as_slice ()); } Word { dt: vec, clen: src.len () } } pub fn concat (src: &[&Word]) -> Word { let mut v_len: usize = 0; let mut c_len: usize = 0; for idx in 0 .. src.len () { v_len += src[idx].len (); c_len += src[idx].len_chars (); } let mut vec = Vec::with_capacity (v_len); for i in 0 .. src.len () { for j in 0 .. src[i].len () { vec.push (src[i].dt[j]) } } Word { dt: vec, clen: c_len } } pub fn as_vec (&self) -> &Vec<u8> { &self.dt } } impl Symbol for Word { fn len (&self) -> usize { self.dt.len () } fn len_chars (&self) -> usize { self.clen } fn contained_at (&self, value: &[u8], index: usize) -> bool { value.len () >= index + self.len () && unsafe { let mut v = value.as_ptr ().offset (index as isize); let mut s = self.dt.as_ptr (); for _ in 0..self.len () { if *v != *s { return false; } v = v.offset (1); s = s.offset (1); } true } } fn as_slice (&self) -> &[u8] { &self.dt[..] } fn as_ptr (&self) -> *const u8 { self.dt.as_ptr () } fn same_as_slice (&self, src: &[u8]) -> bool { &self.dt[..] == src } fn new_vec (&self) -> Vec<u8> { self.dt.clone () } fn to_vec (self) -> Vec<u8> { self.dt } } #[derive (Clone)] pub enum Rune { Char (Char), Word (Word) } impl Symbol for Rune { fn len (&self) -> usize { match *self { Rune::Char (ref c) => c.len (), Rune::Word (ref w) => w.len () } } fn len_chars (&self) -> usize { match *self { Rune::Char (ref c) => c.len_chars (), Rune::Word (ref w) => w.len_chars () } } fn contained_at (&self, value: &[u8], index: usize) -> bool { match *self { Rune::Char (ref c) => c.contained_at (value, index), Rune::Word (ref w) => w.contained_at (value, index) } } fn as_slice (&self) -> &[u8] { match *self { Rune::Char (ref c) => c.as_slice (), Rune::Word (ref w) => w.as_slice () } } fn as_ptr (&self) -> *const u8 { match *self { Rune::Char (ref c) => c.as_ptr (), Rune::Word (ref w) => w.as_ptr () } } fn same_as_slice (&self, src: &[u8]) -> bool { match *self { Rune::Char (ref c) => c.same_as_slice (src), Rune::Word (ref w) => w.same_as_slice (src) } } fn new_vec (&self) -> Vec<u8> { match *self { Rune::Char (ref c) => c.new_vec (), Rune::Word (ref w) => w.new_vec () } } fn to_vec (self) -> Vec<u8> { match self { Rune::Char (c) => c.to_vec (), Rune::Word (w) => w.to_vec () } } } impl From<Char> for Rune { fn from (c: Char) -> Rune { Rune::Char (c) } } impl From<Word> for Rune { fn from (w: Word) -> Rune { Rune::Word (w) } } #[cfg (test)] mod tests { use super::*; #[test] #[should_panic (expected = "Invalid number of bytes for a Char: 0 > 0 < 9")] fn cha0 () { Char::new (&[]); } #[test] fn cha1 () { let cha = Char::new (&[b'a']); assert_eq! (cha.len (), 1); assert_eq! (cha.as_slice (), &[b'a']); } #[test] fn cha2 () { let cha = Char::new (&[b'a', b'b']); assert_eq! (cha.len (), 2); assert_eq! (cha.as_slice (), &[b'a', b'b']); } #[test] fn cha3 () { let cha = Char::new (&[b'a', b'b', b'c']); assert_eq! (cha.len (), 3); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c']); } #[test] fn cha4 () { let cha = Char::new (&[b'a', b'b', b'c', b'd']); assert_eq! (cha.len (), 4); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c', b'd']); } #[test] fn cha5 () { let cha = Char::new (&[b'a', b'b', b'c', b'd', b'e']); assert_eq! (cha.len (), 5); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c', b'd', b'e']); } #[test] fn cha6 () { let cha = Char::new (&[b'a', b'b', b'c', b'd', b'e', b'f']); assert_eq! (cha.len (), 6); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c', b'd', b'e', b'f']); } #[test] fn cha7 () { let cha = Char::new (&[b'a', b'b', b'c', b'd', b'e', b'f', b'g']); assert_eq! (cha.len (), 7); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c', b'd', b'e', b'f', b'g']); } #[test] fn cha8 () { let cha = Char::new (&[b'a', b'b', b'c', b'd', b'e', b'f', b'g', b'h']); assert_eq! (cha.len (), 8); assert_eq! (cha.as_slice (), &[b'a', b'b', b'c', b'd', b'e', b'f', b'g', b'h']); } #[test] #[should_panic (expected = "Invalid number of bytes for a Char: 0 > 9 < 9")] fn cha9 () { Char::new (&[b'a', b'b', b'c', b'd', b'e', b'f', b'g', b'h', b'i']); } #[test] #[should_panic (expected = "Word length must be > 0")] fn word0 () { Word::combine (&[]); } #[test] fn word1 () { let word = Word::combine (&[ &Char::new (&[b'a', b'b', b'c', b'd']), &Char::new (&[b'1']) ]); assert_eq! (word.len (), 5); assert_eq! (word.len_chars (), 2); assert_eq! (word.as_vec ()[..], vec! [b'a', b'b', b'c', b'd', b'1'][..]); assert! (word.same_as_slice (&[b'a', b'b', b'c', b'd', b'1'])); assert! (! word.same_as_slice (&[b'a', b'b', b'c', b'd', b'2'])); assert! (! word.same_as_slice (&[b'a', b'b', b'c', b'd', b'1', b'2'])); } #[test] fn word2 () { let w1 = Word::combine (&[ &Char::new (&[b'a', b'b', b'c']), &Char::new (&[b'1']) ]); let w2 = Char::new (&[b'd', b'e']).to_word (); let w = Word::concat (&[&w1, &w2]); assert_eq! (w.len (), 6); assert_eq! (w.len_chars (), 3); assert_eq! (w.as_vec()[..], vec! [b'a', b'b', b'c', b'1', b'd', b'e'][..]); assert! (w.same_as_slice (&[b'a', b'b', b'c', b'1', b'd', b'e'])); } }