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88 lines
1.9 KiB
Lua
88 lines
1.9 KiB
Lua
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--[[!
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LPEG grammar for C doc comments
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]]
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--- @class nvim.cdoc.Param
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--- @field kind 'param'
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--- @field name string
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--- @field desc? string
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--- @class nvim.cdoc.Return
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--- @field kind 'return'
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--- @field desc string
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--- @class nvim.cdoc.Note
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--- @field desc? string
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--- @alias nvim.cdoc.grammar.result
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--- | nvim.cdoc.Param
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--- | nvim.cdoc.Return
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--- | nvim.cdoc.Note
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--- @class nvim.cdoc.grammar
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--- @field match fun(self, input: string): nvim.cdoc.grammar.result?
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local lpeg = vim.lpeg
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local Ct, Cg = lpeg.Ct, lpeg.Cg
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--- @param x vim.lpeg.Pattern
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local function rep(x)
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return x ^ 0
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end
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--- @param x vim.lpeg.Pattern
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local function rep1(x)
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return x ^ 1
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end
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--- @param x vim.lpeg.Pattern
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local function opt(x)
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return x ^ -1
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end
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local nl = P('\r\n') + P('\n')
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local ws = rep1(S(' \t') + nl)
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local any = P(1) -- (consume one character)
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local letter = R('az', 'AZ') + S('_$')
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local ident = letter * rep(letter + R('09'))
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local io = P('[') * (P('in') + P('out') + P('inout')) * P(']')
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--- @param x string
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local function Pf(x)
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return opt(ws) * P(x) * opt(ws)
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end
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--- @type table<string,vim.lpeg.Pattern>
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local v = setmetatable({}, {
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__index = function(_, k)
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return lpeg.V(k)
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end,
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})
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local grammar = P {
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rep1(P('@') * v.ats),
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ats = v.at_param + v.at_return + v.at_deprecated + v.at_see + v.at_brief + v.at_note + v.at_nodoc,
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at_param = Ct(
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Cg(P('param'), 'kind') * opt(io) * ws * Cg(ident, 'name') * opt(ws * Cg(rep(any), 'desc'))
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),
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at_return = Ct(Cg(P('return'), 'kind') * opt(S('s')) * opt(ws * Cg(rep(any), 'desc'))),
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at_deprecated = Ct(Cg(P('deprecated'), 'kind')),
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at_see = Ct(Cg(P('see'), 'kind') * ws * opt(Pf('#')) * Cg(rep(any), 'desc')),
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at_brief = Ct(Cg(P('brief'), 'kind') * ws * Cg(rep(any), 'desc')),
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at_note = Ct(Cg(P('note'), 'kind') * ws * Cg(rep(any), 'desc')),
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at_nodoc = Ct(Cg(P('nodoc'), 'kind')),
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}
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return grammar --[[@as nvim.cdoc.grammar]]
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