// Copyright 2021 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. // If making significant changes to this grammar, consider also updating the// tree-sitter grammar: https://github.com/bryceberger/tree-sitter-jjrevset whitespace = _{ " " | "\t" | "\r" | "\n" | "\x0c" } // XID_CONTINUE: https://www.unicode.org/reports/tr31/#Default_Identifier_Syntax// +, -, .: often included in tag/bookmark name or version number// /: sometimes used as a tag/bookmark namespace separatoridentifier_part = @{ (XID_CONTINUE | "_" | "/")+ }identifier = @{  identifier_part ~ (("." | "-" | "+") ~ identifier_part)*}// TODO: remove "/", ".", "+" for consistency with fileset?strict_identifier_part = @{ (ASCII_ALPHANUMERIC | "_" | "/")+ }strict_identifier = @{  strict_identifier_part ~ (("." | "-" | "+") ~ strict_identifier_part)*} symbol = _{  identifier  | string_literal  | raw_string_literal} 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 ~ "'" } at_op = { "@" }pattern_kind_op = { ":" } parents_op = { "-" }children_op = { "+" }compat_parents_op = { "^" } dag_range_op = { "::" }dag_range_pre_op = { "::" }dag_range_post_op = { "::" }dag_range_all_op = { "::" }compat_dag_range_op = { ":" }compat_dag_range_pre_op = { ":" }compat_dag_range_post_op = { ":" }range_op = { ".." }range_pre_op = { ".." }range_post_op = { ".." }range_all_op = { ".." }range_ops = _{ dag_range_op | compat_dag_range_op | range_op }range_pre_ops = _{ dag_range_pre_op | compat_dag_range_pre_op | range_pre_op }range_post_ops = _{ dag_range_post_op | compat_dag_range_post_op | range_post_op }range_all_ops = _{ dag_range_all_op | range_all_op } negate_op = { "~" }union_op = { "|" }intersection_op = { "&" }difference_op = { "~" }compat_add_op = { "+" }compat_sub_op = { "-" }infix_op = _{ union_op | intersection_op | difference_op | compat_add_op | compat_sub_op } function = { function_name ~ "(" ~ whitespace* ~ function_arguments ~ whitespace* ~ ")" }function_name = @{ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }keyword_argument = { strict_identifier ~ whitespace* ~ "=" ~ whitespace* ~ expression }argument = _{ keyword_argument | expression }function_arguments = {  argument ~ (whitespace* ~ "," ~ whitespace* ~ argument)* ~ (whitespace* ~ ",")?  | ""}formal_parameters = {  strict_identifier ~ (whitespace* ~ "," ~ whitespace* ~ strict_identifier)* ~ (whitespace* ~ ",")?  | ""} string_pattern = { strict_identifier ~ pattern_kind_op ~ symbol } primary = {  "(" ~ whitespace* ~ expression ~ whitespace* ~ ")"  | function  | string_pattern  // "@" operator cannot be nested  | symbol ~ at_op ~ symbol  | symbol ~ at_op  | symbol  | at_op} neighbors_expression = _{ primary ~ (parents_op | children_op | compat_parents_op)* } range_expression = _{  neighbors_expression ~ range_ops ~ neighbors_expression  | neighbors_expression ~ range_post_ops  | range_pre_ops ~ neighbors_expression  | neighbors_expression  | range_all_ops} expression = {  (negate_op ~ whitespace*)* ~ range_expression  ~ (whitespace* ~ infix_op ~ whitespace* ~ (negate_op ~ whitespace*)* ~ range_expression)*} program_modifier = { strict_identifier ~ pattern_kind_op ~ !":" }program = _{  SOI ~ whitespace* ~ (program_modifier ~ whitespace*)? ~ expression ~ whitespace* ~ EOI} symbol_name = _{ SOI ~ symbol ~ EOI } function_alias_declaration = {  function_name ~ "(" ~ whitespace* ~ formal_parameters ~ whitespace* ~ ")"}alias_declaration = _{  SOI ~ (function_alias_declaration | strict_identifier) ~ EOI}