-- Enumeration of commonly encountered syntax token types.
local SyntaxTokenType = {
    Other = 0, -- Everything except tokens that are part of comments, string literals and regular expressions.
    Comment = 1, -- A comment.
    String = 2, -- A string literal.
    RegEx = 3 -- A regular expression.
}

-- Describes what to do with the indentation when pressing Enter.
local IndentAction = {
    None = 0, -- Insert new line and copy the previous line's indentation.
    Indent = 1, -- Insert new line and indent once (relative to the previous line's indentation).
    IndentOutdent = 2, -- Insert two new lines: the first one indented which will hold the cursor, and the second one at the same indentation level.
    Outdent = 3 -- Insert new line and outdent once (relative to the previous line's indentation).
}

local languageConfiguration = {
    id = 'lua',
    configuration = {
        autoClosingPairs = {
            { open = "{", close = "}" },
            { open = "[", close = "]" },
            { open = "(", close = ")" },
            { open = "'", close = "'", notIn = { SyntaxTokenType.String } },
            { open = '"', close = '"', notIn = { SyntaxTokenType.String } },
            { open = "[=", close = "=]" },
            { open = "[==", close = "==]" },
            { open = "[===", close = "===]" },
            { open = "[====", close = "====]" },
            { open = "[=====", close = "=====]" },
        },
        onEnterRules = {
            {
                beforeText = [[\)\s*$]],
                afterText = [[^\s*end\b]],
                action = {
                    indentAction = IndentAction.IndentOutdent,
                }
            },
            {
                beforeText = [[\b()\s*$]],
                afterText = [[^\s*end\b]],
                action = {
                    indentAction = IndentAction.IndentOutdent,
                }
            },
            {
                beforeText = [[\b(repeat)\s*$]],
                afterText = [[^\s*until\b]],
                action = {
                    indentAction = IndentAction.IndentOutdent,
                }
            },
            {
                beforeText = [[^\s*---@]],
                action = {
                    indentAction = IndentAction.None,
                    appendText = "---@"
                }
            },
            {
                beforeText = [[^\s*--- @]],
                action = {
                    indentAction = IndentAction.None,
                    appendText = "--- @"
                }
            },
            {
                beforeText = [[^\s*--- ]],
                action = {
                    indentAction = IndentAction.None,
                    appendText = "--- "
                }
            },
            {
                beforeText = [[^\s*---]],
                action = {
                    indentAction = IndentAction.None,
                    appendText = "---"
                }
            },
        },
    },
}

return languageConfiguration