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0804034c07
Problem: cache paths are derived by replacing each reserved/filesystem- path-sensitive char with a `%` char in the original path. With this method, two different files at two different paths (each containing `%` chars) can erroneously resolve to the very same cache path in certain edge-cases. Solution: derive cache paths by url-encoding the original (path) instead using `vim.uri_encode()` with `"rfc2396"`. Increment `Loader.VERSION` to denote this change.
128 lines
3.4 KiB
Lua
128 lines
3.4 KiB
Lua
---TODO: This is implemented only for files currently.
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-- https://tools.ietf.org/html/rfc3986
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-- https://tools.ietf.org/html/rfc2732
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-- https://tools.ietf.org/html/rfc2396
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local M = {}
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local sbyte = string.byte
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local schar = string.char
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local tohex = require('bit').tohex
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local URI_SCHEME_PATTERN = '^([a-zA-Z]+[a-zA-Z0-9.+-]*):.*'
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local WINDOWS_URI_SCHEME_PATTERN = '^([a-zA-Z]+[a-zA-Z0-9.+-]*):[a-zA-Z]:.*'
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local PATTERNS = {
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---RFC 2396
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---https://tools.ietf.org/html/rfc2396#section-2.2
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rfc2396 = "^A-Za-z0-9%-_.!~*'()",
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---RFC 2732
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---https://tools.ietf.org/html/rfc2732
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rfc2732 = "^A-Za-z0-9%-_.!~*'()[]",
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---RFC 3986
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---https://tools.ietf.org/html/rfc3986#section-2.2
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rfc3986 = "^A-Za-z0-9%-._~!$&'()*+,;=:@/",
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}
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---Converts hex to char
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---@param hex string
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---@return string
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local function hex_to_char(hex)
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return schar(tonumber(hex, 16))
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end
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---@param char string
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---@return string
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local function percent_encode_char(char)
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return '%' .. tohex(sbyte(char), 2)
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end
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---@param uri string
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---@return boolean
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local function is_windows_file_uri(uri)
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return uri:match('^file:/+[a-zA-Z]:') ~= nil
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end
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---URI-encodes a string using percent escapes.
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---@param str string string to encode
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---@param rfc "rfc2396" | "rfc2732" | "rfc3986" | nil
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---@return string encoded string
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function M.uri_encode(str, rfc)
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local pattern = PATTERNS[rfc] or PATTERNS.rfc3986
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return (str:gsub('([' .. pattern .. '])', percent_encode_char)) -- clamped to 1 retval with ()
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end
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---URI-decodes a string containing percent escapes.
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---@param str string string to decode
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---@return string decoded string
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function M.uri_decode(str)
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return (str:gsub('%%([a-fA-F0-9][a-fA-F0-9])', hex_to_char)) -- clamped to 1 retval with ()
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end
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---Gets a URI from a file path.
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---@param path string Path to file
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---@return string URI
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function M.uri_from_fname(path)
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local volume_path, fname = path:match('^([a-zA-Z]:)(.*)')
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local is_windows = volume_path ~= nil
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if is_windows then
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path = volume_path .. M.uri_encode(fname:gsub('\\', '/'))
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else
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path = M.uri_encode(path)
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end
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local uri_parts = { 'file://' }
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if is_windows then
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table.insert(uri_parts, '/')
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end
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table.insert(uri_parts, path)
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return table.concat(uri_parts)
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end
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---Gets a URI from a bufnr.
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---@param bufnr integer
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---@return string URI
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function M.uri_from_bufnr(bufnr)
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local fname = vim.api.nvim_buf_get_name(bufnr)
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local volume_path = fname:match('^([a-zA-Z]:).*')
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local is_windows = volume_path ~= nil
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local scheme
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if is_windows then
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fname = fname:gsub('\\', '/')
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scheme = fname:match(WINDOWS_URI_SCHEME_PATTERN)
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else
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scheme = fname:match(URI_SCHEME_PATTERN)
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end
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if scheme then
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return fname
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else
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return M.uri_from_fname(fname)
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end
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end
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---Gets a filename from a URI.
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---@param uri string
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---@return string filename or unchanged URI for non-file URIs
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function M.uri_to_fname(uri)
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local scheme = assert(uri:match(URI_SCHEME_PATTERN), 'URI must contain a scheme: ' .. uri)
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if scheme ~= 'file' then
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return uri
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end
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uri = M.uri_decode(uri)
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--TODO improve this.
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if is_windows_file_uri(uri) then
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uri = uri:gsub('^file:/+', '')
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uri = uri:gsub('/', '\\')
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else
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uri = uri:gsub('^file:/+', '/')
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end
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return uri
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end
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---Gets the buffer for a uri.
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---Creates a new unloaded buffer if no buffer for the uri already exists.
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--
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---@param uri string
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---@return integer bufnr
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function M.uri_to_bufnr(uri)
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return vim.fn.bufadd(M.uri_to_fname(uri))
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end
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return M
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