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Merge pull request #81 from wycats/better-parser

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Improve parser
This commit is contained in:
Yehuda Katz 2019-06-04 14:43:38 -07:00 committed by GitHub
commit 8c7fe6d8b8
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 3689 additions and 1178 deletions
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80
src/cli.rs
View File

@ -10,7 +10,8 @@ use crate::evaluate::Scope;
crate use crate::format::{EntriesListView, GenericView};
use crate::git::current_branch;
use crate::object::Value;
use crate::parser::{ParsedCommand, Pipeline};
use crate::parser::ast::{Expression, Leaf};
use crate::parser::{Args, ParsedCommand, Pipeline};
use crate::stream::empty_stream;
use log::debug;
@ -208,6 +209,18 @@ async fn process_line(readline: Result<String, ReadlineError>, ctx: &mut Context
input = match (item, next) {
(None, _) => break,
(Some(ClassifiedCommand::Expr(_)), _) => {
return LineResult::Error(ShellError::unimplemented(
"Expression-only commands",
))
}
(_, Some(ClassifiedCommand::Expr(_))) => {
return LineResult::Error(ShellError::unimplemented(
"Expression-only commands",
))
}
(
Some(ClassifiedCommand::Internal(left)),
Some(ClassifiedCommand::Internal(_)),
@ -305,36 +318,55 @@ fn classify_pipeline(
}
fn classify_command(
command: &ParsedCommand,
command: &Expression,
context: &Context,
) -> Result<ClassifiedCommand, ShellError> {
let command_name = &command.name[..];
let args = &command.args;
// let command_name = &command.name[..];
// let args = &command.args;
match command_name {
other => match context.has_command(command_name) {
true => {
let command = context.get_command(command_name);
let config = command.config();
let scope = Scope::empty();
if let Expression::Call(call) = command {
match (&call.name, &call.args) {
(Expression::Leaf(Leaf::Bare(name)), args) => {
match context.has_command(&name.to_string()) {
true => {
let command = context.get_command(&name.to_string());
let config = command.config();
let scope = Scope::empty();
let args = config.evaluate_args(args.iter(), &scope)?;
let args = match args {
Some(args) => config.evaluate_args(args.iter(), &scope)?,
None => Args::default(),
};
Ok(ClassifiedCommand::Internal(InternalCommand {
command,
args,
}))
Ok(ClassifiedCommand::Internal(InternalCommand {
command,
args,
}))
}
false => {
let arg_list_strings: Vec<String> = match args {
Some(args) => args.iter().map(|i| i.as_external_arg()).collect(),
None => vec![],
};
Ok(ClassifiedCommand::External(ExternalCommand {
name: name.to_string(),
args: arg_list_strings,
}))
}
}
}
false => {
let arg_list_strings: Vec<String> =
args.iter().map(|i| i.as_external_arg()).collect();
Ok(ClassifiedCommand::External(ExternalCommand {
name: other.to_string(),
args: arg_list_strings,
}))
}
},
(_, None) => Err(ShellError::string(
"Unimplemented command that is just an expression (1)",
)),
(_, Some(args)) => Err(ShellError::string("Unimplemented dynamic command")),
}
} else {
Err(ShellError::string(&format!(
"Unimplemented command that is just an expression (2) -- {:?}",
command
)))
}
}

2
src/commands/classified.rs
View File

@ -1,3 +1,4 @@
use crate::parser::ast::Expression;
use crate::parser::registry::Args;
use crate::prelude::*;
use bytes::{BufMut, BytesMut};
@ -75,6 +76,7 @@ crate struct ClassifiedPipeline {
}
crate enum ClassifiedCommand {
Expr(Expression),
Internal(InternalCommand),
External(ExternalCommand),
}

21
src/errors.rs
View File

@ -48,6 +48,10 @@ impl ShellError {
ShellError::String(StringError::new(title.into(), Value::nothing()))
}
crate fn unimplemented(title: impl Into<String>) -> ShellError {
ShellError::string(&format!("Unimplemented: {}", title.into()))
}
crate fn copy_error(&self) -> ShellError {
self.clone()
}
@ -58,6 +62,23 @@ pub struct ShellDiagnostic {
crate diagnostic: Diagnostic<Span>,
}
impl ShellDiagnostic {
crate fn simple_diagnostic(
span: impl Into<Span>,
source: impl Into<String>,
) -> ShellDiagnostic {
use language_reporting::*;
let span = span.into();
let source = source.into();
let diagnostic =
Diagnostic::new(Severity::Error, "Parse error").with_label(Label::new_primary(span));
ShellDiagnostic { diagnostic }
}
}
impl PartialEq for ShellDiagnostic {
fn eq(&self, _other: &ShellDiagnostic) -> bool {
false

1
src/evaluate/evaluator.rs
View File

@ -23,6 +23,7 @@ impl Scope {
crate fn evaluate_expr(expr: &ast::Expression, scope: &Scope) -> Result<Value, ShellError> {
use ast::*;
match expr {
Expression::Call(c) => Err(ShellError::unimplemented("Evaluating call expression")),
Expression::Leaf(l) => Ok(evaluate_leaf(l)),
Expression::Parenthesized(p) => evaluate_expr(&p.expr, scope),
Expression::Flag(f) => Ok(Value::Primitive(Primitive::String(f.print()))),

14
src/format/table.rs
View File

@ -1,5 +1,5 @@
use crate::format::RenderView;
use crate::object::Value;
use crate::object::{DataDescriptor, Value};
use crate::prelude::*;
use derive_new::new;
use prettytable::{color, Attr, Cell, Row, Table};
@ -11,7 +11,7 @@ use prettytable::{color, Attr, Cell, Row, Table};
// another_name : ...
#[derive(new)]
pub struct TableView {
headers: Vec<String>,
headers: Vec<DataDescriptor>,
entries: Vec<Vec<String>>,
}
@ -22,18 +22,16 @@ impl TableView {
}
let item = &values[0];
let descs = item.data_descriptors();
let headers = item.data_descriptors();
if descs.len() == 0 {
if headers.len() == 0 {
return None;
}
let headers: Vec<String> = descs.iter().map(|d| d.name.display().to_string()).collect();
let mut entries = vec![];
for value in values {
let row = descs
let row = headers
.iter()
.enumerate()
.map(|(i, d)| value.get_data(d).borrow().format_leaf(Some(&headers[i])))
@ -60,7 +58,7 @@ impl RenderView for TableView {
.headers
.iter()
.map(|h| {
Cell::new(h)
Cell::new(h.display_header())
.with_style(Attr::ForegroundColor(color::GREEN))
.with_style(Attr::Bold)
})

12
src/object/base.rs
View File

@ -75,7 +75,7 @@ impl Primitive {
.to_string()
}
crate fn format(&self, field_name: Option<&str>) -> String {
crate fn format(&self, field_name: Option<&DataDescriptor>) -> String {
match self {
Primitive::Nothing => format!("{}", Color::Black.bold().paint("-")),
Primitive::Bytes(b) => {
@ -98,8 +98,10 @@ impl Primitive {
Primitive::Boolean(b) => match (b, field_name) {
(true, None) => format!("Yes"),
(false, None) => format!("No"),
(true, Some(s)) => format!("{}", s),
(false, Some(_)) => format!(""),
(true, Some(s)) if s.is_string_name() => format!("{}", s.display_header()),
(false, Some(s)) if s.is_string_name() => format!(""),
(true, Some(_)) => format!("Yes"),
(false, Some(_)) => format!("No"),
},
Primitive::Date(d) => format!("{}", d.humanize()),
}
@ -207,9 +209,9 @@ impl Value {
}
}
crate fn format_leaf(&self, field_name: Option<&str>) -> String {
crate fn format_leaf(&self, desc: Option<&DataDescriptor>) -> String {
match self {
Value::Primitive(p) => p.format(field_name),
Value::Primitive(p) => p.format(desc),
Value::Block(b) => b.expression.print(),
Value::Object(_) => format!("[object Object]"),
Value::List(_) => format!("[list List]"),

23
src/object/desc.rs
View File

@ -1,7 +1,7 @@
use crate::object::types::Type;
use derive_new::new;
use serde_derive::{Deserialize, Serialize};
use serde::{Serialize, Serializer};
use serde_derive::{Deserialize, Serialize};
#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Serialize, Deserialize, Hash)]
pub enum DescriptorName {
@ -39,18 +39,27 @@ pub struct DataDescriptor {
crate ty: Type,
}
impl DataDescriptor {
crate fn display_header(&self) -> &str {
self.name.display()
}
crate fn is_string_name(&self) -> bool {
match self.name {
DescriptorName::String(_) => true,
DescriptorName::ValueOf => false,
}
}
}
impl Serialize for DataDescriptor {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match self.name {
DescriptorName::String(ref s) => {
serializer.serialize_str(s)
}
DescriptorName::ValueOf => {
serializer.serialize_str("value")
}
DescriptorName::String(ref s) => serializer.serialize_str(s),
DescriptorName::ValueOf => serializer.serialize_str("value"),
}
}
}

47
src/parser.rs
View File

@ -10,12 +10,20 @@ crate use registry::{Args, CommandConfig};
use crate::errors::ShellError;
use lexer::Lexer;
use log::trace;
use parser::PipelineParser;
pub fn parse(input: &str) -> Result<Pipeline, ShellError> {
let _ = pretty_env_logger::try_init();
let parser = PipelineParser::new();
let tokens = Lexer::new(input, false);
trace!(
"Tokens: {:?}",
tokens.clone().collect::<Result<Vec<_>, _>>()
);
match parser.parse(tokens) {
Ok(val) => Ok(val),
Err(err) => Err(ShellError::parse_error(err, input.to_string())),
@ -25,12 +33,33 @@ pub fn parse(input: &str) -> Result<Pipeline, ShellError> {
#[cfg(test)]
mod tests {
use super::*;
use crate::parser::ast::{bare, binary, flag, short, unit, var, Pipeline};
use crate::parser::ast::{bare, flag, short, unit, var, Expression, Operator, Pipeline};
use pretty_assertions::assert_eq;
fn assert_parse(source: &str, expected: Pipeline) {
let parsed = parse(source).unwrap();
let parsed = match parse(source) {
Ok(p) => p,
Err(ShellError::Diagnostic(diag, source)) => {
use language_reporting::termcolor;
let writer = termcolor::StandardStream::stdout(termcolor::ColorChoice::Auto);
let files = crate::parser::span::Files::new(source);
language_reporting::emit(
&mut writer.lock(),
&files,
&diag.diagnostic,
&language_reporting::DefaultConfig,
)
.unwrap();
panic!("Test failed")
}
Err(err) => panic!("Something went wrong during parse: {:#?}", err),
};
let printed = parsed.print();
assert_eq!(parsed, expected);
assert_eq!(source, printed);
}
@ -47,15 +76,15 @@ mod tests {
macro_rules! command {
($name:ident $( $command:expr )*) => {
ParsedCommand::new(stringify!($name).into(), vec![ $($command.into()),* ])
Expression::call(Expression::bare(stringify!($name)), vec![ $($command.into()),* ])
};
($name:ident $( $command:expr )*) => {
ParsedCommand::new(stringify!($name).into(), vec![ $($command.into()),* ])
Expression::call(Expression::bare(stringify!($name)), vec![ $($command.into()),* ])
};
($name:tt $( $command:expr )*) => {
ParsedCommand::new($name.into(), vec![ $($command.into()),* ])
Expression::call(Expression::bare($name), vec![ $($command.into()),* ])
};
}
@ -164,4 +193,12 @@ mod tests {
],
);
}
fn binary(
left: impl Into<Expression>,
op: impl Into<Operator>,
right: impl Into<Expression>,
) -> Expression {
Expression::binary(left, op, right)
}
}

129
src/parser/ast.rs
View File

@ -59,6 +59,7 @@ pub enum Expression {
Block(Box<Block>),
Binary(Box<Binary>),
Path(Box<Path>),
Call(Box<ParsedCommand>),
VariableReference(Variable),
}
@ -68,6 +69,12 @@ impl From<&str> for Expression {
}
}
impl From<String> for Expression {
fn from(input: String) -> Expression {
Expression::Leaf(Leaf::String(input.into()))
}
}
impl From<i64> for Expression {
fn from(input: i64) -> Expression {
Expression::Leaf(Leaf::Int(input.into()))
@ -99,8 +106,41 @@ impl From<Binary> for Expression {
}
impl Expression {
crate fn leaf(leaf: impl Into<Leaf>) -> Expression {
Expression::Leaf(leaf.into())
}
crate fn flag(flag: impl Into<Flag>) -> Expression {
Expression::Flag(flag.into())
}
crate fn call(head: Expression, tail: Vec<Expression>) -> Expression {
if tail.len() == 0 {
Expression::Call(Box::new(ParsedCommand::new(head.into(), None)))
} else {
Expression::Call(Box::new(ParsedCommand::new(head.into(), Some(tail))))
}
}
crate fn binary(
left: impl Into<Expression>,
operator: impl Into<Operator>,
right: impl Into<Expression>,
) -> Expression {
Expression::Binary(Box::new(Binary {
left: left.into(),
operator: operator.into(),
right: right.into(),
}))
}
crate fn block(expr: impl Into<Expression>) -> Expression {
Expression::Block(Box::new(Block::new(expr.into())))
}
crate fn print(&self) -> String {
match self {
Expression::Call(c) => c.print(),
Expression::Leaf(l) => l.print(),
Expression::Flag(f) => f.print(),
Expression::Parenthesized(p) => p.print(),
@ -113,6 +153,7 @@ impl Expression {
crate fn as_external_arg(&self) -> String {
match self {
Expression::Call(c) => c.as_external_arg(),
Expression::Leaf(l) => l.as_external_arg(),
Expression::Flag(f) => f.as_external_arg(),
Expression::Parenthesized(p) => p.as_external_arg(),
@ -123,6 +164,10 @@ impl Expression {
}
}
crate fn bare(path: impl Into<BarePath>) -> Expression {
Expression::Leaf(Leaf::Bare(path.into()))
}
crate fn as_string(&self) -> Option<String> {
match self {
Expression::Leaf(Leaf::String(s)) => Some(s.to_string()),
@ -131,6 +176,13 @@ impl Expression {
}
}
crate fn as_bare(&self) -> Option<String> {
match self {
Expression::Leaf(Leaf::Bare(p)) => Some(p.to_string()),
_ => None,
}
}
crate fn is_flag(&self, value: &str) -> bool {
match self {
Expression::Flag(Flag::Longhand(f)) if value == f => true,
@ -218,8 +270,8 @@ impl Variable {
crate fn from_str(input: &str) -> Expression {
match input {
"it" => Expression::VariableReference(Variable::It),
"true" => Expression::Leaf(Leaf::Boolean(true)),
"false" => Expression::Leaf(Leaf::Boolean(false)),
"yes" => Expression::Leaf(Leaf::Boolean(true)),
"no" => Expression::Leaf(Leaf::Boolean(false)),
other => Expression::VariableReference(Variable::Other(other.to_string())),
}
}
@ -236,8 +288,7 @@ impl Variable {
}
}
#[cfg(test)]
pub fn bare(s: &str) -> BarePath {
pub fn bare(s: impl Into<String>) -> BarePath {
BarePath {
head: s.into(),
tail: vec![],
@ -250,7 +301,23 @@ pub struct BarePath {
tail: Vec<String>,
}
impl<T: Into<String>> From<T> for BarePath {
fn from(input: T) -> BarePath {
BarePath {
head: input.into(),
tail: vec![],
}
}
}
impl BarePath {
crate fn from_token(head: SpannedToken) -> BarePath {
BarePath {
head: head.to_string(),
tail: vec![],
}
}
crate fn from_tokens(head: SpannedToken, tail: Vec<SpannedToken>) -> BarePath {
BarePath {
head: head.to_string(),
@ -363,19 +430,6 @@ impl Binary {
}
}
#[cfg(test)]
crate fn binary(
left: impl Into<Expression>,
operator: impl Into<Operator>,
right: impl Into<Expression>,
) -> Binary {
Binary {
left: left.into(),
operator: operator.into(),
right: right.into(),
}
}
impl Binary {
fn print(&self) -> String {
format!(
@ -427,21 +481,36 @@ impl Flag {
}
}
#[derive(new, Debug, Clone, Eq, PartialEq)]
#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, new)]
pub struct ParsedCommand {
crate name: String,
crate args: Vec<Expression>,
crate name: Expression,
crate args: Option<Vec<Expression>>,
}
impl ParsedCommand {
#[allow(unused)]
fn as_external_arg(&self) -> String {
let mut out = vec![];
write!(out, "{}", self.name.as_external_arg()).unwrap();
if let Some(args) = &self.args {
for arg in args.iter() {
write!(out, " {}", arg.as_external_arg()).unwrap();
}
}
String::from_utf8_lossy(&out).into_owned()
}
fn print(&self) -> String {
let mut out = vec![];
write!(out, "{}", self.name).unwrap();
write!(out, "{}", self.name.print()).unwrap();
for arg in self.args.iter() {
write!(out, " {}", arg.print()).unwrap();
if let Some(args) = &self.args {
for arg in args.iter() {
write!(out, " {}", arg.print()).unwrap();
}
}
String::from_utf8_lossy(&out).into_owned()
@ -451,8 +520,8 @@ impl ParsedCommand {
impl From<&str> for ParsedCommand {
fn from(input: &str) -> ParsedCommand {
ParsedCommand {
name: input.to_string(),
args: vec![],
name: Expression::Leaf(Leaf::Bare(bare(input))),
args: None,
}
}
}
@ -460,19 +529,19 @@ impl From<&str> for ParsedCommand {
impl From<(&str, Vec<Expression>)> for ParsedCommand {
fn from(input: (&str, Vec<Expression>)) -> ParsedCommand {
ParsedCommand {
name: input.0.to_string(),
args: input.1,
name: Expression::bare(input.0),
args: Some(input.1),
}
}
}
#[derive(new, Debug, Eq, PartialEq)]
pub struct Pipeline {
crate commands: Vec<ParsedCommand>,
crate commands: Vec<Expression>,
}
impl Pipeline {
crate fn from_parts(command: ParsedCommand, rest: Vec<ParsedCommand>) -> Pipeline {
crate fn from_parts(command: Expression, rest: Vec<Expression>) -> Pipeline {
let mut commands = vec![command];
commands.extend(rest);

14
src/parser/lexer.rs
View File

@ -23,7 +23,7 @@ crate enum TopToken {
#[regex = r#""([^"]|\\")*""#]
DQString,
#[regex = r"\$"]
#[token = "$"]
#[callback = "start_variable"]
Dollar,
@ -257,6 +257,12 @@ crate enum AfterMemberDot {
#[callback = "finish_member"]
Member,
#[regex = r#"'([^']|\\')*'"#]
SQString,
#[regex = r#""([^"]|\\")*""#]
DQString,
#[regex = r"\s"]
Whitespace,
}
@ -268,6 +274,9 @@ impl AfterMemberDot {
let result = match self {
END => return None,
Member => Token::Member,
SQString => Token::SQMember,
DQString => Token::DQMember,
Whitespace => Token::Whitespace,
Error => unreachable!("Don't call to_token with the error variant"),
};
@ -387,6 +396,8 @@ pub enum Token {
Variable,
PathDot,
Member,
SQMember,
DQMember,
Num,
SQString,
DQString,
@ -418,6 +429,7 @@ pub enum Token {
// Whitespace(SpannedToken<'source, &'source str>),
// }
#[derive(Clone)]
crate struct Lexer<'source> {
lexer: logos::Lexer<TopToken, &'source str>,
first: bool,

153
src/parser/parser.lalrpop
View File

@ -6,72 +6,117 @@ use crate::prelude::*;
use crate::parser::lexer::{SpannedToken, Token};
use byte_unit::Byte;
// nu's grammar is a little bit different from a lot of other languages, to better match
// the idioms and constraints of a shell environment. A lot of the constraints are
// the same as PowerShell, but mostly derived from the same first principles.
//
// - Other than at the beginning of a command, bare words are virtually always parsed as
// strings. This means that, in general, bare words cannot be used as keywords or
// variables.
// - Variable names begin with `$`, and so do keywords
// - Functions are invoked without `()` and without comma separation
// - In general, because of the lack of comma-separation, expressions must be grouped:
// - a single token
// - a path ($variable followed by any number of `"." member`)
// - parenthesized expression
// - This means that more elaborate expressions, like binary expressions, must usually
// be parenthesized
// - There is a special case for a command that takes a single expression, which can
// omit the parens
grammar<'input>;
pub Pipeline: Pipeline = {
<first:Command> => Pipeline::new(vec![first]),
<first:Command> <rest: ( "|" <Command> )+> => Pipeline::from_parts(first, rest),
<first:PipelineElement> <rest: ( "|" <PipelineElement> )*> => Pipeline::from_parts(first, rest),
}
Command: ParsedCommand = {
<command:BarePath> => ParsedCommand::new(command.to_string(), vec![]),
<command:BarePath> <expr:Expr+> => ParsedCommand::new(command.to_string(), expr),
<command:BarePath> <expr:BinaryExpression> => ParsedCommand::new(command.to_string(), vec![expr]),
PipelineElement: Expression = {
<Bare> => Expression::call(Expression::bare(<>), vec![]),
<SingleExpression> => <>,
}
Leaf: Expression = {
<String> => Expression::Leaf(Leaf::String(<>)),
<Int> => Expression::Leaf(Leaf::Int(<>)),
<UnitsNum> => Expression::Leaf(<>),
// A leaf expression is a single logical token that directly represents an expression
LeafExpression: Expression = {
<String> => <>,
<Int> => Expression::leaf(Leaf::Int(<>)),
<UnitsNum> => <>,
<Var> => <>,
}
BinaryExpression: Expression = {
<left:Expr> <op:Operator> <right:Expr> => Expression::Binary(Box::new(Binary::new(left, op, right))),
pub Call: Expression = {
<expr:Expression> <rest:SingleCallArgument> => Expression::call(expr, vec![rest]),
<expr:Expression> <first:CallArgument> <rest:( <CallArgument> )+> => Expression::call(expr, { let mut rest = rest; let mut v = vec![first]; v.append(&mut rest); v }),
<expr:Bare> <rest:SingleCallArgument> => Expression::call(Expression::bare(expr), vec![rest]),
<expr:Bare> <first:CallArgument> <rest:( <CallArgument> )+> => Expression::call(Expression::bare(expr), { let mut v = vec![first]; let mut rest = rest; v.append(&mut rest); v }),
}
Parenthesized: Expression = {
"(" <Leaf> ")" => Expression::Parenthesized(Box::new(Parenthesized::new(<>))),
"(" <BinaryExpression> ")" => Expression::Parenthesized(Box::new(Parenthesized::new(<>))),
}
AtomicExpression: Expression = {
<Parenthesized>,
<Leaf>,
Binary: Expression = {
<left:ArgumentExpression> <op:Operator> <right:ArgumentExpression> => Expression::binary(left, op, right),
}
// In a block, a single bare word is interpreted as a call:
//
// foreach { ls }
Block: Expression = {
"{" <AtomicExpression> "}" => Expression::Block(Box::new(Block::new(<>))),
"{" <BinaryExpression> "}" => Expression::Block(Box::new(Block::new(<>))),
"{" <SingleExpression> "}" => Expression::block(<>),
"{" <Bare> "}" => Expression::block(Expression::call(Expression::bare(<>), vec![])),
}
WholeExpression: Expression = {
<AtomicExpression>,
<Block>,
// An `Expression` is the most general kind of expression. It can go anywhere, even right next to another expression, and
// even as the first part of a call.
Expression: Expression = {
<LeafExpression> => <>,
<Block> => <>,
"(" <Call> ")" => <>,
"(" <Bare> ")" => Expression::call(Expression::bare(<>), vec![]),
"(" <Binary> ")" => <>,
}
PathHead: Expression = {
<WholeExpression>,
<BarePath> => Expression::Leaf(Leaf::Bare(<>)),
<Flag> => Expression::Flag(<>),
// An `ArgumentExpression` is an expression that appears in an argument list. It includes all of `Expression`, and
// bare words are interpreted as strings.
ArgumentExpression: Expression = {
<Expression>,
<Bare> => Expression::bare(<>),
}
PathExpression: Expression = {
<head:WholeExpression> <tail: ( "???." <Member> )+> => Expression::Path(Box::new(Path::new(head, tail)))
CallArgument: Expression = {
<ArgumentExpression> => <>,
<Flag> => Expression::flag(<>),
}
Expr: Expression = {
<PathExpression>,
<PathHead>
SingleCallArgument: Expression = {
<CallArgument>,
<Binary>,
}
Var: Expression = {
"$" <"variable"> => Variable::from_str(<>.as_slice()),
// A `SingleExpression` is a special-case of `Expression` for situations where expressions do not appear side-by-side.
// Because expression lists in nu are not comma-separated, composite expressions (like binary expressions) must be
// parenthesized in lists. If only a single expression appears alone, the parentheses may be left out.
//
// `SingleExpression` does not include `Bare`, because expressions that include `SingleExpression` must decide how
// to interpret a single bare word (`foreach { ls }` vs `cd ls`).
SingleExpression: Expression = {
<Expression>,
<Call>,
<Binary>,
}
// === LOGICAL TOKENS === //
// A logical token may be composed of more than one raw token, but the tokens must be emitted
// from the stream in exactly one sequence. This allows us to use parser infrastructure to
// compose tokens without the risk that these logical tokens will introduce ambiguities.
Bare: BarePath = {
<head: "bare"> => BarePath::from_token(head)
}
// A member is a special token that represents bare words or string literals immediate
// following a dot.
Member: String = {
<"member"> => <>.to_string(),
<String>
<"dqmember"> => <>.to_string(),
<"sqmember"> => <>.to_string(),
}
Operator: Operator = {
@ -83,26 +128,26 @@ Operator: Operator = {
">=" => Operator::GreaterThanOrEqual
}
Flag: Flag = {
"-" <BarePath> => Flag::Shorthand(<>.to_string()),
"--" <BarePath> => Flag::Longhand(<>.to_string()),
}
String: String = {
<"sqstring"> => <>.as_slice()[1..(<>.as_slice().len() - 1)].to_string(),
<"dqstring"> => <>.as_slice()[1..(<>.as_slice().len() - 1)].to_string()
}
BarePath: BarePath = {
<head: "bare"> <tail: ( "???." <"member"> )*> => BarePath::from_tokens(head, tail)
}
Int: i64 = {
<"num"> => i64::from_str(<>.as_slice()).unwrap()
}
UnitsNum: Leaf = {
<num: Int> <unit: "unit"> => Leaf::Unit(num, Unit::from_str(unit.as_slice()).unwrap())
UnitsNum: Expression = {
<num: Int> <unit: "unit"> => Expression::leaf(Leaf::Unit(num, Unit::from_str(unit.as_slice()).unwrap()))
}
String: Expression = {
<"sqstring"> => <>.as_slice()[1..(<>.as_slice().len() - 1)].to_string().into(),
<"dqstring"> => <>.as_slice()[1..(<>.as_slice().len() - 1)].to_string().into()
}
Flag: Flag = {
"-" <Bare> => Flag::Shorthand(<>.to_string()),
"--" <Bare> => Flag::Longhand(<>.to_string()),
}
Var: Expression = {
"$" <"variable"> => Variable::from_str(<>.as_slice()).into(),
}
extern {
@ -127,6 +172,8 @@ extern {
"???." => SpannedToken { token: Token::PathDot, .. },
"num" => SpannedToken { token: Token::Num, .. },
"member" => SpannedToken { token: Token::Member, .. },
"sqmember" => SpannedToken { token: Token::SQMember, .. },
"dqmember" => SpannedToken { token: Token::SQMember, .. },
"variable" => SpannedToken { token: Token::Variable, .. },
"bare" => SpannedToken { token: Token::Bare, .. },
"dqstring" => SpannedToken { token: Token::DQString, .. },

4370
src/parser/parser.rs
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1
src/parser/registry.rs
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@ -73,6 +73,7 @@ pub struct CommandConfig {
crate named: IndexMap<String, NamedType>,
}
#[derive(Debug, Default)]
pub struct Args {
pub positional: Vec<Value>,
pub named: IndexMap<String, Value>,