// Copyright 2021-2024 The Jujutsu Authors//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// https://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License. whitespace = _{ " " | "\t" | "\r" | "\n" | "\x0c" } // XID_CONTINUE: https://www.unicode.org/reports/tr31/#Default_Identifier_Syntax// +, -, ., @, _: commonly used in file name including "." and ".."// *, ?, [, ]: glob characters (not extended glob)// /: path separator// \: path separator (Windows)identifier = @{  (XID_CONTINUE | "+" | "-" | "." | "@" | "_" | "*" | "?" | "[" | "]" | "/" | "\\")+}strict_identifier_part = @{ (ASCII_ALPHANUMERIC | "_")+ }strict_identifier = @{  strict_identifier_part ~ ("-" ~ strict_identifier_part)*} // TODO: accept more ASCII meta characters such as "#" and ","?bare_string = @{  ( ASCII_ALPHANUMERIC  | " " | "+" | "-" | "." | "@" | "_" | "*" | "?" | "[" | "]" | "/" | "\\"  | '\u{80}'..'\u{10ffff}' )+} string_escape = @{  "\\"  ~ ("t" | "r" | "n" | "0" | "e" | ("x" ~ ASCII_HEX_DIGIT{2}) | "\"" | "\\")}string_content_char = @{ !("\"" | "\\") ~ ANY }string_content = @{ string_content_char+ }string_literal = ${ "\"" ~ (string_content | string_escape)* ~ "\"" } raw_string_content = @{ (!"'" ~ ANY)* }raw_string_literal = ${ "'" ~ raw_string_content ~ "'" } pattern_kind_op = { ":" } negate_op = { "~" }union_op = { "|" }intersection_op = { "&" }difference_op = { "~" }prefix_ops = _{ negate_op }infix_ops = _{ union_op | intersection_op | difference_op } function = { function_name ~ "(" ~ whitespace* ~ function_arguments ~ whitespace* ~ ")" }function_name = @{ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }function_arguments = {  expression ~ (whitespace* ~ "," ~ whitespace* ~ expression)* ~ (whitespace* ~ ",")?  | ""} string_pattern = {  strict_identifier  ~ pattern_kind_op  ~ (identifier | string_literal | raw_string_literal)}bare_string_pattern = { strict_identifier ~ pattern_kind_op ~ bare_string } primary = {  "(" ~ whitespace* ~ expression ~ whitespace* ~ ")"  | function  | string_pattern  | identifier  | string_literal  | raw_string_literal} expression = {  (prefix_ops ~ whitespace*)* ~ primary  ~ (whitespace* ~ infix_ops ~ whitespace* ~ (prefix_ops ~ whitespace*)* ~ primary)*} program = _{ SOI ~ whitespace* ~ expression ~ whitespace* ~ EOI }program_or_bare_string = _{  SOI ~ ( whitespace* ~ expression ~ whitespace* ~ EOI        | bare_string_pattern ~ EOI        | bare_string ~ EOI )}