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https://github.com/neovim/neovim.git
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84 lines
3.0 KiB
Lua
84 lines
3.0 KiB
Lua
local lpeg = vim.lpeg
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local M = {}
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--- Parses a raw glob into an |lua-lpeg| pattern.
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---
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--- This uses glob semantics from LSP 3.17.0: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#pattern
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---
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--- Glob patterns can have the following syntax:
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--- - `*` to match one or more characters in a path segment
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--- - `?` to match on one character in a path segment
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--- - `**` to match any number of path segments, including none
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--- - `{}` to group conditions (e.g. `*.{ts,js}` matches TypeScript and JavaScript files)
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--- - `[]` to declare a range of characters to match in a path segment (e.g., `example.[0-9]` to match on `example.0`, `example.1`, …)
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--- - `[!...]` to negate a range of characters to match in a path segment (e.g., `example.[!0-9]` to match on `example.a`, `example.b`, but not `example.0`)
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---
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---@param pattern string The raw glob pattern
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---@return vim.lpeg.Pattern pattern An |lua-lpeg| representation of the pattern
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function M.to_lpeg(pattern)
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local l = lpeg
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local P, S, V = lpeg.P, lpeg.S, lpeg.V
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local C, Cc, Ct, Cf = lpeg.C, lpeg.Cc, lpeg.Ct, lpeg.Cf
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local pathsep = '/'
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local function class(inv, ranges)
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for i, r in ipairs(ranges) do
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ranges[i] = r[1] .. r[2]
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end
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local patt = l.R(unpack(ranges))
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if inv == '!' then
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patt = P(1) - patt
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end
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return patt
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end
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local function add(acc, a)
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return acc + a
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end
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local function mul(acc, m)
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return acc * m
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end
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local function star(stars, after)
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return (-after * (l.P(1) - pathsep)) ^ #stars * after
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end
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local function dstar(after)
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return (-after * l.P(1)) ^ 0 * after
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end
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local p = P({
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'Pattern',
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Pattern = V('Elem') ^ -1 * V('End'),
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Elem = Cf(
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(V('DStar') + V('Star') + V('Ques') + V('Class') + V('CondList') + V('Literal'))
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* (V('Elem') + V('End')),
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mul
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),
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DStar = P('**') * (P(pathsep) * (V('Elem') + V('End')) + V('End')) / dstar,
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Star = C(P('*') ^ 1) * (V('Elem') + V('End')) / star,
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Ques = P('?') * Cc(l.P(1) - pathsep),
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Class = P('[') * C(P('!') ^ -1) * Ct(Ct(C(1) * '-' * C(P(1) - ']')) ^ 1 * ']') / class,
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CondList = P('{') * Cf(V('Cond') * (P(',') * V('Cond')) ^ 0, add) * '}',
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-- TODO: '*' inside a {} condition is interpreted literally but should probably have the same
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-- wildcard semantics it usually has.
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-- Fixing this is non-trivial because '*' should match non-greedily up to "the rest of the
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-- pattern" which in all other cases is the entire succeeding part of the pattern, but at the end of a {}
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-- condition means "everything after the {}" where several other options separated by ',' may
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-- exist in between that should not be matched by '*'.
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Cond = Cf((V('Ques') + V('Class') + V('CondList') + (V('Literal') - S(',}'))) ^ 1, mul)
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+ Cc(l.P(0)),
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Literal = P(1) / l.P,
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End = P(-1) * Cc(l.P(-1)),
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})
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local lpeg_pattern = p:match(pattern) --[[@as vim.lpeg.Pattern?]]
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return assert(lpeg_pattern, 'Invalid glob')
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end
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return M
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