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|
-- nvim-paredit extension for scheme
-- Copyright (C) 2023 Ekaitz Zarraga
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
local traversal = require("nvim-paredit.utils.traversal")
-- THIS IS A REFERENCE, UNUSED
local nodes = {
"comment",
"block_comment", -- for example, #| something |#
"directive", -- for example, #!r6rs
"boolean",
"character",
"string",
"escape_sequence", -- escape sequence in string, for example, \n in "abc\n"
"number",
"symbol", -- identifier
"keyword", -- #:identifier
"list", -- things surrounded by () or [] or {}
"quote", -- '
"quasiquote", -- `
"syntax", -- #'
"quasisyntax", --`
"unquote", -- ,
"unquote_splicing", -- ,@
"unsyntax", -- #,
"unsyntax_splicing", -- #,@
"vector",
"byte_vector",
}
local forms = {
comment = {2, 0}, -- for srfi 62, #;
block_comment = {2, 2}, -- for example, #| something |#
string = {1, 1},
list = {1, 1}, -- things surrounded by () or [] or {}
vector = {2, 1}, -- #(...)
byte_vector = {5, 1}, -- #vu8(...)
vector = {2, 1},
}
local function find_next_parent_form(current_node)
if forms[current_node:type()] then
return current_node
end
local parent = current_node:parent()
if parent then
return find_next_parent_form(parent)
end
return current_node
end
local function find_parent_comment(node)
if node:type() == "comment" then
return node
end
local parent = node:parent()
if parent then
return find_parent_comment(parent)
else
return nil
end
end
local M = {}
-- Should return the 'root' of the given Treesitter node. For example:
-- The node at cursor in the below example is `()` or 'list_lit':
-- '(|)
-- But the node root is `'()` or 'quoting_lit'
M.get_node_root = function(node)
local search_point = node
if M.node_is_form(node) then
search_point = node:parent()
end
local root = find_next_parent_form(search_point)
return traversal.find_root_element_relative_to(root, node)
end
-- This is the inverse of `get_node_root` for forms and should find the inner
-- node for which the forms elements are direct children.
--
-- For example given the node `'()` or 'quoting_lit', this function should
-- return `()` or 'list_lit'.
M.unwrap_form = function(node)
if forms[node:type()] then
return node
end
local child = node:named_child(0)
if child then
return M.unwrap_form(child)
end
end
-- Accepts a Treesitter node and should return true or false depending on
-- whether the given node can be considered a 'form'
M.node_is_form = function(node)
if M.unwrap_form(node) then
return true
else
return false
end
end
-- Accepts a Treesitter node and should return true or false depending on
-- whether the given node can be considered a 'comment'
M.node_is_comment = function(node)
return (find_parent_comment(node)
or node:type() == "comment"
or node:type() == "block_comment")
end
-- Accepts a Treesitter node representing a form and should return the
-- 'edges' of the node. This includes the node text and the range covered by
-- the node
M.get_form_edges = function(node)
local node_range = { node:range() }
local form = M.unwrap_form(node)
local form_range = { form:range() }
-- Get the size of the form boundaries
local size = forms[node:type()]
if not size then
-- default to {1, 1}
size = {1, 1}
end
-- If it's an inline comment don't do anything
if node:type() == "comment"
and vim.api.nvim_buf_get_text(0, form_range[1], form_range[2],
form_range[3], form_range[4], {})[1]:sub(1,1) == ";"
then
return {}
end
local left_range = { node_range[1], node_range[2] }
left_range[3] = form_range[1]
left_range[4] = form_range[2] + size[1]
local right_range = { form:range() }
right_range[1] = right_range[3]
right_range[2] = right_range[4] - size[2]
local left_text = vim.api.nvim_buf_get_text(0, left_range[1], left_range[2],
left_range[3], left_range[4], {})
local right_text = vim.api.nvim_buf_get_text(0, right_range[1],
right_range[2], right_range[3], right_range[4], {})
return {
left = {
text = left_text[1],
range = left_range,
},
right = {
text = right_text[1],
range = right_range,
},
}
end
return M
|
