// Copyright 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. //! Parser for the fileset language. use std::error;use std::sync::LazyLock; use itertools::Itertools as _;use pest::Parser as _;use pest::iterators::Pair;use pest::pratt_parser::Assoc;use pest::pratt_parser::Op;use pest::pratt_parser::PrattParser;use pest_derive::Parser;use thiserror::Error; use crate::dsl_util;use crate::dsl_util::Diagnostics;use crate::dsl_util::InvalidArguments;use crate::dsl_util::StringLiteralParser; #[derive(Parser)]#[grammar = "fileset.pest"]struct FilesetParser; const STRING_LITERAL_PARSER: StringLiteralParser<Rule> = StringLiteralParser {    content_rule: Rule::string_content,    escape_rule: Rule::string_escape,}; impl Rule {    fn to_symbol(self) -> Option<&'static str> {        match self {            Self::EOI => None,            Self::whitespace => None,            Self::identifier => None,            Self::strict_identifier_part => None,            Self::strict_identifier => None,            Self::bare_string => None,            Self::string_escape => None,            Self::string_content_char => None,            Self::string_content => None,            Self::string_literal => None,            Self::raw_string_content => None,            Self::raw_string_literal => None,            Self::pattern_kind_op => Some(":"),            Self::negate_op => Some("~"),            Self::union_op => Some("|"),            Self::intersection_op => Some("&"),            Self::difference_op => Some("~"),            Self::prefix_ops => None,            Self::infix_ops => None,            Self::function => None,            Self::function_name => None,            Self::function_arguments => None,            Self::string_pattern => None,            Self::bare_string_pattern => None,            Self::primary => None,            Self::expression => None,            Self::program => None,            Self::program_or_bare_string => None,        }    }} /// Manages diagnostic messages emitted during fileset parsing and name/// resolution.pub type FilesetDiagnostics = Diagnostics<FilesetParseError>; /// Result of fileset parsing and name resolution.pub type FilesetParseResult<T> = Result<T, FilesetParseError>; /// Error occurred during fileset parsing and name resolution.#[derive(Debug, Error)]#[error("{pest_error}")]pub struct FilesetParseError {    kind: FilesetParseErrorKind,    pest_error: Box<pest::error::Error<Rule>>,    source: Option<Box<dyn error::Error + Send + Sync>>,} /// Categories of fileset parsing and name resolution error.#[expect(missing_docs)]#[derive(Clone, Debug, Eq, Error, PartialEq)]pub enum FilesetParseErrorKind {    #[error("Syntax error")]    SyntaxError,    #[error("Function `{name}` doesn't exist")]    NoSuchFunction {        name: String,        candidates: Vec<String>,    },    #[error("Function `{name}`: {message}")]    InvalidArguments { name: String, message: String },    #[error("{0}")]    Expression(String),} impl FilesetParseError {    pub(super) fn new(kind: FilesetParseErrorKind, span: pest::Span<'_>) -> Self {        let message = kind.to_string();        let pest_error = Box::new(pest::error::Error::new_from_span(            pest::error::ErrorVariant::CustomError { message },            span,        ));        Self {            kind,            pest_error,            source: None,        }    }     pub(super) fn with_source(        mut self,        source: impl Into<Box<dyn error::Error + Send + Sync>>,    ) -> Self {        self.source = Some(source.into());        self    }     /// Some other expression error.    pub(super) fn expression(message: impl Into<String>, span: pest::Span<'_>) -> Self {        Self::new(FilesetParseErrorKind::Expression(message.into()), span)    }     /// Category of the underlying error.    pub fn kind(&self) -> &FilesetParseErrorKind {        &self.kind    }} impl From<pest::error::Error<Rule>> for FilesetParseError {    fn from(err: pest::error::Error<Rule>) -> Self {        Self {            kind: FilesetParseErrorKind::SyntaxError,            pest_error: Box::new(rename_rules_in_pest_error(err)),            source: None,        }    }} impl From<InvalidArguments<'_>> for FilesetParseError {    fn from(err: InvalidArguments<'_>) -> Self {        let kind = FilesetParseErrorKind::InvalidArguments {            name: err.name.to_owned(),            message: err.message,        };        Self::new(kind, err.span)    }} fn rename_rules_in_pest_error(err: pest::error::Error<Rule>) -> pest::error::Error<Rule> {    err.renamed_rules(|rule| {        rule.to_symbol()            .map(|sym| format!("`{sym}`"))            .unwrap_or_else(|| format!("<{rule:?}>"))    })} #[derive(Clone, Debug, Eq, PartialEq)]pub enum ExpressionKind<'i> {    Identifier(&'i str),    String(String),    StringPattern {        kind: &'i str,        value: String,    },    Unary(UnaryOp, Box<ExpressionNode<'i>>),    Binary(BinaryOp, Box<ExpressionNode<'i>>, Box<ExpressionNode<'i>>),    /// `x | y | ..`    UnionAll(Vec<ExpressionNode<'i>>),    FunctionCall(Box<FunctionCallNode<'i>>),} #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]pub enum UnaryOp {    /// `~`    Negate,} #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]pub enum BinaryOp {    /// `&`    Intersection,    /// `~`    Difference,} pub type ExpressionNode<'i> = dsl_util::ExpressionNode<'i, ExpressionKind<'i>>;pub type FunctionCallNode<'i> = dsl_util::FunctionCallNode<'i, ExpressionKind<'i>>; fn union_nodes<'i>(lhs: ExpressionNode<'i>, rhs: ExpressionNode<'i>) -> ExpressionNode<'i> {    let span = lhs.span.start_pos().span(&rhs.span.end_pos());    let expr = match lhs.kind {        // Flatten "x | y | z" to save recursion stack. Machine-generated query        // might have long chain of unions.        ExpressionKind::UnionAll(mut nodes) => {            nodes.push(rhs);            ExpressionKind::UnionAll(nodes)        }        _ => ExpressionKind::UnionAll(vec![lhs, rhs]),    };    ExpressionNode::new(expr, span)} fn parse_function_call_node(pair: Pair<Rule>) -> FilesetParseResult<FunctionCallNode> {    assert_eq!(pair.as_rule(), Rule::function);    let [name_pair, args_pair] = pair.into_inner().collect_array().unwrap();    assert_eq!(name_pair.as_rule(), Rule::function_name);    assert_eq!(args_pair.as_rule(), Rule::function_arguments);    let name_span = name_pair.as_span();    let args_span = args_pair.as_span();    let name = name_pair.as_str();    let args = args_pair        .into_inner()        .map(parse_expression_node)        .try_collect()?;    Ok(FunctionCallNode {        name,        name_span,        args,        keyword_args: vec![], // unsupported        args_span,    })} fn parse_as_string_literal(pair: Pair<Rule>) -> String {    match pair.as_rule() {        Rule::identifier => pair.as_str().to_owned(),        Rule::string_literal => STRING_LITERAL_PARSER.parse(pair.into_inner()),        Rule::raw_string_literal => {            let [content] = pair.into_inner().collect_array().unwrap();            assert_eq!(content.as_rule(), Rule::raw_string_content);            content.as_str().to_owned()        }        r => panic!("unexpected string literal rule: {r:?}"),    }} fn parse_primary_node(pair: Pair<Rule>) -> FilesetParseResult<ExpressionNode> {    assert_eq!(pair.as_rule(), Rule::primary);    let span = pair.as_span();    let first = pair.into_inner().next().unwrap();    let expr = match first.as_rule() {        // Ignore inner span to preserve parenthesized expression as such.        Rule::expression => parse_expression_node(first)?.kind,        Rule::function => {            let function = Box::new(parse_function_call_node(first)?);            ExpressionKind::FunctionCall(function)        }        Rule::string_pattern => {            let [lhs, op, rhs] = first.into_inner().collect_array().unwrap();            assert_eq!(lhs.as_rule(), Rule::strict_identifier);            assert_eq!(op.as_rule(), Rule::pattern_kind_op);            let kind = lhs.as_str();            let value = parse_as_string_literal(rhs);            ExpressionKind::StringPattern { kind, value }        }        Rule::identifier => ExpressionKind::Identifier(first.as_str()),        Rule::string_literal | Rule::raw_string_literal => {            ExpressionKind::String(parse_as_string_literal(first))        }        r => panic!("unexpected primary rule: {r:?}"),    };    Ok(ExpressionNode::new(expr, span))} fn parse_expression_node(pair: Pair<Rule>) -> FilesetParseResult<ExpressionNode> {    assert_eq!(pair.as_rule(), Rule::expression);    static PRATT: LazyLock<PrattParser<Rule>> = LazyLock::new(|| {        PrattParser::new()            .op(Op::infix(Rule::union_op, Assoc::Left))            .op(Op::infix(Rule::intersection_op, Assoc::Left)                | Op::infix(Rule::difference_op, Assoc::Left))            .op(Op::prefix(Rule::negate_op))    });    PRATT        .map_primary(parse_primary_node)        .map_prefix(|op, rhs| {            let op_kind = match op.as_rule() {                Rule::negate_op => UnaryOp::Negate,                r => panic!("unexpected prefix operator rule {r:?}"),            };            let rhs = Box::new(rhs?);            let span = op.as_span().start_pos().span(&rhs.span.end_pos());            let expr = ExpressionKind::Unary(op_kind, rhs);            Ok(ExpressionNode::new(expr, span))        })        .map_infix(|lhs, op, rhs| {            let op_kind = match op.as_rule() {                Rule::union_op => return Ok(union_nodes(lhs?, rhs?)),                Rule::intersection_op => BinaryOp::Intersection,                Rule::difference_op => BinaryOp::Difference,                r => panic!("unexpected infix operator rule {r:?}"),            };            let lhs = Box::new(lhs?);            let rhs = Box::new(rhs?);            let span = lhs.span.start_pos().span(&rhs.span.end_pos());            let expr = ExpressionKind::Binary(op_kind, lhs, rhs);            Ok(ExpressionNode::new(expr, span))        })        .parse(pair.into_inner())} /// Parses text into expression tree. No name resolution is made at this stage.pub fn parse_program(text: &str) -> FilesetParseResult<ExpressionNode<'_>> {    let mut pairs = FilesetParser::parse(Rule::program, text)?;    let first = pairs.next().unwrap();    parse_expression_node(first)} /// Parses text into expression tree with bare string fallback. No name/// resolution is made at this stage.////// If the text can't be parsed as a fileset expression, and if it doesn't/// contain any operator-like characters, it will be parsed as a file path.pub fn parse_program_or_bare_string(text: &str) -> FilesetParseResult<ExpressionNode<'_>> {    let mut pairs = FilesetParser::parse(Rule::program_or_bare_string, text)?;    let first = pairs.next().unwrap();    let span = first.as_span();    let expr = match first.as_rule() {        Rule::expression => return parse_expression_node(first),        Rule::bare_string_pattern => {            let [lhs, op, rhs] = first.into_inner().collect_array().unwrap();            assert_eq!(lhs.as_rule(), Rule::strict_identifier);            assert_eq!(op.as_rule(), Rule::pattern_kind_op);            assert_eq!(rhs.as_rule(), Rule::bare_string);            let kind = lhs.as_str();            let value = rhs.as_str().to_owned();            ExpressionKind::StringPattern { kind, value }        }        Rule::bare_string => ExpressionKind::String(first.as_str().to_owned()),        r => panic!("unexpected program or bare string rule: {r:?}"),    };    Ok(ExpressionNode::new(expr, span))} #[cfg(test)]mod tests {    use assert_matches::assert_matches;     use super::*;    use crate::dsl_util::KeywordArgument;     fn parse_into_kind(text: &str) -> Result<ExpressionKind<'_>, FilesetParseErrorKind> {        parse_program(text)            .map(|node| node.kind)            .map_err(|err| err.kind)    }     fn parse_maybe_bare_into_kind(text: &str) -> Result<ExpressionKind<'_>, FilesetParseErrorKind> {        parse_program_or_bare_string(text)            .map(|node| node.kind)            .map_err(|err| err.kind)    }     fn parse_normalized(text: &str) -> ExpressionNode<'_> {        normalize_tree(parse_program(text).unwrap())    }     fn parse_maybe_bare_normalized(text: &str) -> ExpressionNode<'_> {        normalize_tree(parse_program_or_bare_string(text).unwrap())    }     /// Drops auxiliary data from parsed tree so it can be compared with other.    fn normalize_tree(node: ExpressionNode) -> ExpressionNode {        fn empty_span() -> pest::Span<'static> {            pest::Span::new("", 0, 0).unwrap()        }         fn normalize_list(nodes: Vec<ExpressionNode>) -> Vec<ExpressionNode> {            nodes.into_iter().map(normalize_tree).collect()        }         fn normalize_function_call(function: FunctionCallNode) -> FunctionCallNode {            FunctionCallNode {                name: function.name,                name_span: empty_span(),                args: normalize_list(function.args),                keyword_args: function                    .keyword_args                    .into_iter()                    .map(|arg| KeywordArgument {                        name: arg.name,                        name_span: empty_span(),                        value: normalize_tree(arg.value),                    })                    .collect(),                args_span: empty_span(),            }        }         let normalized_kind = match node.kind {            ExpressionKind::Identifier(_)            | ExpressionKind::String(_)            | ExpressionKind::StringPattern { .. } => node.kind,            ExpressionKind::Unary(op, arg) => {                let arg = Box::new(normalize_tree(*arg));                ExpressionKind::Unary(op, arg)            }            ExpressionKind::Binary(op, lhs, rhs) => {                let lhs = Box::new(normalize_tree(*lhs));                let rhs = Box::new(normalize_tree(*rhs));                ExpressionKind::Binary(op, lhs, rhs)            }            ExpressionKind::UnionAll(nodes) => {                let nodes = normalize_list(nodes);                ExpressionKind::UnionAll(nodes)            }            ExpressionKind::FunctionCall(function) => {                let function = Box::new(normalize_function_call(*function));                ExpressionKind::FunctionCall(function)            }        };        ExpressionNode {            kind: normalized_kind,            span: empty_span(),        }    }     #[test]    fn test_parse_tree_eq() {        assert_eq!(            parse_normalized(r#" foo( x ) | ~bar:"baz" "#),            parse_normalized(r#"(foo(x))|(~(bar:"baz"))"#)        );        assert_ne!(parse_normalized(r#" foo "#), parse_normalized(r#" "foo" "#));    }     #[test]    fn test_parse_invalid_function_name() {        assert_eq!(            parse_into_kind("5foo(x)"),            Err(FilesetParseErrorKind::SyntaxError)        );    }     #[test]    fn test_parse_whitespace() {        let ascii_whitespaces: String = ('\x00'..='\x7f')            .filter(char::is_ascii_whitespace)            .collect();        assert_eq!(            parse_normalized(&format!("{ascii_whitespaces}f()")),            parse_normalized("f()")        );    }     #[test]    fn test_parse_identifier() {        assert_eq!(            parse_into_kind("dir/foo-bar_0.baz"),            Ok(ExpressionKind::Identifier("dir/foo-bar_0.baz"))        );        assert_eq!(            parse_into_kind("cli-reference@.md.snap"),            Ok(ExpressionKind::Identifier("cli-reference@.md.snap"))        );        assert_eq!(            parse_into_kind("柔術.jj"),            Ok(ExpressionKind::Identifier("柔術.jj"))        );        assert_eq!(            parse_into_kind(r#"Windows\Path"#),            Ok(ExpressionKind::Identifier(r#"Windows\Path"#))        );        assert_eq!(            parse_into_kind("glob*[chars]?"),            Ok(ExpressionKind::Identifier("glob*[chars]?"))        );    }     #[test]    fn test_parse_string_literal() {        // "\<char>" escapes        assert_eq!(            parse_into_kind(r#" "\t\r\n\"\\\0\e" "#),            Ok(ExpressionKind::String("\t\r\n\"\\\0\u{1b}".to_owned())),        );         // Invalid "\<char>" escape        assert_eq!(            parse_into_kind(r#" "\y" "#),            Err(FilesetParseErrorKind::SyntaxError),        );         // Single-quoted raw string        assert_eq!(

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