tree-sitter: initial tree-sitter support

runtime/lua/treesitter_rt.lua

@@ -0,0 +1,119 @@
+local a = vim.api
+
+if __treesitter_rt_ns == nil then
+    __treesitter_rt_ns = a.nvim_buf_add_highlight(0, 0, "", 0, 0, 0)
+    __treesitter_rt_syn_ns = a.nvim_buf_add_highlight(0, 0, "", 0, 0, 0)
+end
+local my_ns = __treesitter_rt_ns
+local my_syn_ns = __treesitter_rt_syn_ns
+
+local path = '.deps/build/src/treesitter-javascript/src/highlights.json'
+a.nvim_set_var("_ts_path", path)
+obj = a.nvim_eval("json_decode(readfile(g:_ts_path,'b'))")
+
+
+--luadev = require'luadev'
+--i = require'inspect'
+
+
+function parse_tree(tsstate, force)
+  if tsstate.valid and not force then
+    return tsstate.tree
+  end
+  tsstate.tree = tsstate.parser:parse_buf(tsstate.bufnr)
+  tsstate.valid = true
+  return tsstate.tree
+end
+
+function the_cb(tsstate, ev, bufnr, tick, start_row, oldstopline, stop_row)
+  local start_byte = a.nvim_buf_get_offset(bufnr,start_row)
+  -- a bit messy, should we expose edited but not reparsed tree?
+  -- are multiple edits safe in general?
+  local root = tsstate.parser:tree():root()
+  -- TODO: add proper lookup function!
+  local inode = root:descendant_for_point_range(oldstopline+9000,0, oldstopline,0)
+  local edit
+  if inode == nil then
+    local stop_byte = a.nvim_buf_get_offset(bufnr,stop_row)
+    tsstate.parser:edit(start_byte,stop_byte,stop_byte,start_row,0,stop_row,0,stop_row,0)
+  else
+    local fakeoldstoprow, fakeoldstopcol, fakebyteoldstop = inode:start()
+    local fake_rows = fakeoldstoprow-oldstopline
+    local fakestop = stop_row+fake_rows
+    local fakebytestop = a.nvim_buf_get_offset(bufnr,fakestop)+fakeoldstopcol
+    tsstate.parser:edit(start_byte,fakebyteoldstop,fakebytestop,start_row,0,fakeoldstoprow,fakeoldstopcol,fakestop,fakeoldstopcol)
+  end
+  tsstate.valid = false
+  --luadev.append_buf({i{edit.start_byte,edit.old_end_byte,edit.new_end_byte},
+  --                   i{edit.start_point, edit.old_end_point, edit.new_end_point}})
+end
+
+function attach_buf(tsstate)
+  local function cb(ev, ...)
+    return the_cb(tsstate, ev, ...)
+  end
+  a.nvim_buf_attach(tsstate.bufnr, false, {on_lines=cb})
+end
+
+function create_parser(bufnr)
+  if bufnr == 0 then
+    bufnr = a.nvim_get_current_buf()
+  end
+  local ft = a.nvim_buf_get_option(bufnr, "filetype")
+  local tsstate = {}
+  tsstate.bufnr = bufnr
+  tsstate.parser = vim.ts_parser(ft)
+  parse_tree(tsstate)
+  attach_buf(tsstate)
+  return tsstate
+end
+
+function ts_inspect_pos(row,col)
+  local tree = parse_tree(theparser)
+  local root = tree:root()
+  local node = root:descendant_for_point_range(row,col,row,col)
+  show_node(node)
+end
+
+function show_node(node)
+  if node == nil then
+    return
+  end
+  a.nvim_buf_clear_highlight(0, my_ns, 0, -1)
+  shown_node = node
+  print(node:type())
+  local start_row, start_col, end_row, end_col = node:range()
+
+  a.nvim_buf_add_highlight(0, my_ns, "ErrorMsg", start_row, start_col, start_col+1)
+
+  if end_col >= 1 then
+    end_col = end_col - 1
+  end
+  a.nvim_buf_add_highlight(0, my_ns, "ErrorMsg", end_row, end_col, end_col+1)
+end
+
+function ts_expand_node()
+  if shown_node == nil then
+    return
+  end
+  parent = shown_node:parent()
+  show_node(parent)
+end
+
+function ts_cursor()
+  local row, col = unpack(a.nvim_win_get_cursor(0))
+  ts_inspect_pos(row-1, col)
+end
+
+if false then
+  ctree = theparser.tree
+  root = ctree:root()
+  cursor = root:to_cursor()
+  node = cursor:forward(5000) if true then return node end
+  print(#root)
+  c = root:child(50)
+  print(require'inspect'{c:extent()})
+  type(ctree.__tostring)
+  root:__tostring()
+  print(_tslua_debug())
+end