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local utils = require'nvim-treesitter.utils'
local M = {}
local function get_nth_child(node, n)
if node:named_child_count() > n then
return node:named_child(n)
end
end
local function get_node(query, match, pred_item)
return utils.get_at_path(match, query.captures[pred_item]..'.node')
end
function M.check_predicate(query, match, pred)
local check_function = M[pred[1]]
if check_function then
return check_function(query, match, pred)
else
return true
end
end
function M.check_negated_predicate(query, match, pred)
local check_function = M[string.sub(pred[1], #"not-" + 1)]
if check_function then
return not check_function(query, match, pred)
else
return true
end
end
M['first?'] = function (query, match, pred)
if #pred ~= 2 then error("first? must have exactly one argument!") end
local node = get_node(query, match, pred[2])
if node and node:parent() then
return get_nth_child(node:parent(), 0) == node
end
end
M['last?'] = function (query, match, pred)
if #pred ~= 2 then error("first? must have exactly one argument!") end
local node = get_node(query, match, pred[2])
if node and node:parent() then
local num_children = node:parent():named_child_count()
return get_nth_child(node:parent(), num_children - 1) == node
end
end
M['nth?'] = function(query, match, pred)
if #pred ~= 3 then error("nth? must have exactly two arguments!") end
local node = get_node(query, match, pred[2])
if node and node:parent() then
return get_nth_child(node:parent(), pred[3] - 1) == node
end
end
M['has_ancestor?'] = function(query, match, pred)
if #pred ~= 3 then error("has-ancestor? must have exactly two arguments!") end
local node = get_node(query, match, pred[2])
local ancestor_type = pred[3]
if not node then return true end
node = node:parent()
while node do
if node:type() == ancestor_type then
return true
end
node = node:parent()
end
return false
end
return M
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