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return function(utf8)
local matchers = {
frontier = function(class, name)
local class_name = 'class' .. name
return [[
local ]] .. class_name .. [[ = ]] .. class .. [[
add(function(ctx) -- frontier
ctx:prev_char()
local prev_charcode = ctx:get_charcode() or 0
ctx:next_char()
local charcode = ctx:get_charcode() or 0
-- debug("frontier pos", ctx.pos, "prev_charcode", prev_charcode, "charcode", charcode)
if ]] .. class_name .. [[:test(prev_charcode) then return end
if ]] .. class_name .. [[:test(charcode) then
ctx:next_function()
return ctx:get_function()(ctx)
end
end)
]]
end,
simple = utf8:require("modifier.compiletime.simple").simple,
}
local function parse(regex, c, bs, ctx)
local functions, nbs, class
if c == '%' then
if utf8.raw.sub(regex, bs + 1, bs + 1) ~= 'f' then return end
if utf8.raw.sub(regex, bs + 2, bs + 2) ~= '[' then error("missing '[' after '%f' in pattern") end
functions = {}
if ctx.prev_class then
table.insert(functions, matchers.simple(ctx.prev_class, tostring(bs)))
ctx.prev_class = nil
end
class, nbs = utf8.regex.compiletime.charclass.parse(regex, '[', bs + 2, ctx)
nbs = nbs + 2
table.insert(functions, matchers.frontier(class:build(), tostring(bs)))
end
return functions, nbs
end
return {
parse = parse,
}
end
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