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https://github.com/neovim/neovim.git
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111 lines
2.3 KiB
Lua
111 lines
2.3 KiB
Lua
-- Basic shim for LuaJIT's stringbuffer.
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-- Note this does not implement the full API.
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-- This is intentionally internal-only. If we want to expose it, we should
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-- reimplement this a userdata and ship it as `string.buffer`
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-- (minus the FFI stuff) for Lua 5.1.
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local M = {}
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local has_strbuffer, strbuffer = pcall(require, 'string.buffer')
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if has_strbuffer then
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M.new = strbuffer.new
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-- Lua 5.1 does not have __len metamethod so we need to provide a len()
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-- function to use instead.
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--- @param buf vim._stringbuffer
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--- @return integer
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function M.len(buf)
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return #buf
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end
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return M
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end
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--- @class vim._stringbuffer
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--- @field private buf string[]
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--- @field package len integer absolute length of the `buf`
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--- @field package skip_ptr integer
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local StrBuffer = {}
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StrBuffer.__index = StrBuffer
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--- @return string
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function StrBuffer:tostring()
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if #self.buf > 1 then
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self.buf = { table.concat(self.buf) }
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end
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-- assert(self.len == #(self.buf[1] or ''), 'len mismatch')
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if self.skip_ptr > 0 then
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if self.buf[1] then
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self.buf[1] = self.buf[1]:sub(self.skip_ptr + 1)
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self.len = self.len - self.skip_ptr
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end
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self.skip_ptr = 0
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end
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-- assert(self.len == #(self.buf[1] or ''), 'len mismatch')
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return self.buf[1] or ''
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end
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StrBuffer.__tostring = StrBuffer.tostring
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--- @private
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--- Efficiently peak at the first `n` characters of the buffer.
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--- @param n integer
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--- @return string
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function StrBuffer:_peak(n)
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local skip, buf1 = self.skip_ptr, self.buf[1]
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if buf1 and (n + skip) < #buf1 then
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return buf1:sub(skip + 1, skip + n)
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end
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return self:tostring():sub(1, n)
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end
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--- @param chunk string
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function StrBuffer:put(chunk)
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local s = tostring(chunk)
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self.buf[#self.buf + 1] = s
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self.len = self.len + #s
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return self
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end
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--- @param str string
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function StrBuffer:set(str)
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return self:reset():put(str)
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end
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--- @param n integer
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--- @return string
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function StrBuffer:get(n)
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local r = self:_peak(n)
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self:skip(n)
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return r
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end
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--- @param n integer
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function StrBuffer:skip(n)
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self.skip_ptr = math.min(self.len, self.skip_ptr + n)
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return self
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end
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function StrBuffer:reset()
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self.buf = {}
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self.skip_ptr = 0
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self.len = 0
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return self
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end
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function M.new()
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return setmetatable({}, StrBuffer):reset()
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end
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--- @param buf vim._stringbuffer
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function M.len(buf)
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return buf.len - buf.skip_ptr
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end
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return M
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