# In Buffers, the internal sequence of character is mutable
# Thus, `chars` can be used to modify the buffer.
redef fun chars: Sequence[Char] is abstract
+
+ # Appends `length` chars from `s` starting at index `from`
+ #
+ # ~~~nit
+ # var b = new Buffer
+ # b.append_substring("abcde", 1, 2)
+ # assert b == "bc"
+ # b.append_substring("vwxyz", 2, 3)
+ # assert b == "bcxyz"
+ # b.append_substring("ABCDE", 4, 300)
+ # assert b == "bcxyzE"
+ # b.append_substring("VWXYZ", 400, 1)
+ # assert b == "bcxyzE"
+ # ~~~
+ fun append_substring(s: Text, from, length: Int) do
+ if from < 0 then
+ length += from
+ from = 0
+ end
+ var ln = s.length
+ if (length + from) > ln then length = ln - from
+ if length <= 0 then return
+ append_substring_impl(s, from, length)
+ end
+
+ # Unsafe version of `append_substring` for performance
+ #
+ # NOTE: Use only if sure about `from` and `length`, no checks
+ # or bound recalculation is done
+ fun append_substring_impl(s: Text, from, length: Int) do
+ var pos = from
+ for i in [0 .. length[ do
+ self.add s[pos]
+ pos += 1
+ end
+ end
end
# View for chars on Buffer objects, extends Sequence
return cp >= 0xD800 and cp <= 0xDFFF
end
+ # Is `self` a UTF-16 high surrogate ?
+ fun is_hi_surrogate: Bool do
+ var cp = code_point
+ return cp >= 0xD800 and cp <= 0xDBFF
+ end
+
+ # Is `self` a UTF-16 low surrogate ?
+ fun is_lo_surrogate: Bool do
+ var cp = code_point
+ return cp >= 0xDC00 and cp <= 0xDFFF
+ end
+
# Length of `self` in a UTF-8 String
fun u8char_len: Int do
var c = self.code_point
# SEE: `abstract_text::Text` for more info on the difference
# between `Text::bytelen` and `Text::length`.
fun to_s_full(bytelen, unilen: Int): String is abstract
+
+ # Copies the content of `src` to `self`
+ #
+ # NOTE: `self` must be large enough to withold `self.bytelen` bytes
+ fun fill_from(src: Text) do src.copy_to_native(self, src.bytelen, 0, 0)
end
redef class NativeArray[E]
end
return res
end
+
+ redef fun copy_to_native(dst, n, src_off, dst_off) do
+ _items.copy_to(dst, n, first_byte + src_off, dst_off)
+ end
end
# Immutable strings of characters.
if from < 0 then
count += from
- if count < 0 then return ""
+ if count <= 0 then return ""
from = 0
end
end
redef fun substring(from, count) do
+ var ln = _length
+ if count <= 0 then return ""
+ if (count + from) > ln then count = ln - from
if count <= 0 then return ""
-
if from < 0 then
count += from
- if count < 0 then return ""
+ if count <= 0 then return ""
from = 0
end
- var ln = _length
- if (count + from) > ln then count = ln - from
return new ASCIIFlatString.full_data(_items, count, from + _first_byte, count)
end
is_dirty = true
_bytelen = 0
_length = 0
- if written then reset
+ if written then
+ _capacity = 16
+ reset
+ end
end
redef fun empty do return new Buffer
return new FlatBuffer.with_infos(r_items, byte_length, byte_length, count)
end
+ redef fun append_substring_impl(s, from, length) do
+ if length <= 0 then return
+ if not s isa FlatText then
+ super
+ return
+ end
+ var bytest = s.char_to_byte_index(from)
+ var bytend = s.char_to_byte_index(from + length - 1)
+ var btln = bytend - bytest + 1
+ enlarge(btln + _bytelen)
+ s._items.copy_to(_items, btln, bytest, _bytelen)
+ _bytelen += btln
+ _length += length
+ end
+
redef fun reverse
do
written = false
#
# Very unsafe, make sure to have room for this char prior to calling this function.
private fun set_char_at(pos: Int, c: Char) do
- if c.code_point < 128 then
- self[pos] = c.code_point.to_b
+ var cp = c.code_point
+ if cp < 128 then
+ self[pos] = cp.to_b
return
end
var ln = c.u8char_len
- native_set_char(pos, c, ln)
- end
-
- private fun native_set_char(pos: Int, c: Char, ln: Int) `{
- char* dst = self + pos;
- switch(ln){
- case 1:
- dst[0] = c;
- break;
- case 2:
- dst[0] = 0xC0 | ((c & 0x7C0) >> 6);
- dst[1] = 0x80 | (c & 0x3F);
- break;
- case 3:
- dst[0] = 0xE0 | ((c & 0xF000) >> 12);
- dst[1] = 0x80 | ((c & 0xFC0) >> 6);
- dst[2] = 0x80 | (c & 0x3F);
- break;
- case 4:
- dst[0] = 0xF0 | ((c & 0x1C0000) >> 18);
- dst[1] = 0x80 | ((c & 0x3F000) >> 12);
- dst[2] = 0x80 | ((c & 0xFC0) >> 6);
- dst[3] = 0x80 | (c & 0x3F);
- break;
- }
- `}
+ if ln == 2 then
+ self[pos] = (0xC0 | ((cp & 0x7C0) >> 6)).to_b
+ self[pos + 1] = (0x80 | (cp & 0x3F)).to_b
+ else if ln == 3 then
+ self[pos] = (0xE0 | ((cp & 0xF000) >> 12)).to_b
+ self[pos + 1] = (0x80 | ((cp & 0xFC0) >> 6)).to_b
+ self[pos + 2] = (0x80 | (cp & 0x3F)).to_b
+ else if ln == 4 then
+ self[pos] = (0xF0 | ((cp & 0x1C0000) >> 18)).to_b
+ self[pos + 1] = (0x80 | ((cp & 0x3F000) >> 12)).to_b
+ self[pos + 2] = (0x80 | ((cp & 0xFC0) >> 6)).to_b
+ self[pos + 3] = (0x80 | (cp & 0x3F)).to_b
+ end
+ end
end
redef class Int
nitlanguage / nit.git / commitdiff