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Add && and || operators (#2444)

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Casey Rodarmor 2024-10-31 17:54:46 -07:00 committed by GitHub
parent 4c6368ecfc
commit 7030e9cac6
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20 changed files with 378 additions and 236 deletions
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8
GRAMMAR.md
View File

@ -90,7 +90,13 @@ import : 'import' '?'? string? eol
module : 'mod' '?'? NAME string? eol
expression : 'if' condition '{' expression '}' 'else' '{' expression '}'
expression : disjunct || expression
| disjunct
disjunct : conjunct && disjunct
| conjunct
conjunct : 'if' condition '{' expression '}' 'else' '{' expression '}'
| 'assert' '(' condition ',' expression ')'
| '/' expression
| value '/' expression

43
README.md
View File

@ -1290,9 +1290,11 @@ Available recipes:
test
```
### Variables and Substitution
### Expressions and Substitutions
Variables, strings, concatenation, path joining, substitution using `{{…}}`, and function calls are supported:
Various operators and function calls are supported in expressions, which may be
used in assignments, default recipe arguments, and inside recipe body `{{…}}`
substitutions.
```just
tmpdir := `mktemp -d`
@ -1310,6 +1312,39 @@ publish:
rm -rf {{tarball}} {{tardir}}
```
#### Concatenation
The `+` operator returns the left-hand argument concatenated with the
right-hand argument:
```just
foobar := 'foo' + 'bar'
```
#### Logical Operators
The logical operators `&&` and `||` can be used to coalesce string
values<sup>master</sup>, similar to Python's `and` and `or`. These operators
consider the empty string `''` to be false, and all other strings to be true.
These operators are currently unstable.
The `&&` operator returns the empty string if the left-hand argument is the
empty string, otherwise it returns the right-hand argument:
```mf
foo := '' && 'goodbye' # ''
bar := 'hello' && 'goodbye' # 'goodbye'
```
The `||` operator returns the left-hand argument if it is non-empty, otherwise
it returns the right-hand argument:
```mf
foo := '' || 'goodbye' # 'goodbye'
bar := 'hello' || 'goodbye' # 'hello'
```
#### Joining Paths
The `/` operator can be used to join two strings with a slash:
@ -2367,8 +2402,8 @@ Testing server:unit…
./test --tests unit server
```
Default values may be arbitrary expressions, but concatenations or path joins
must be parenthesized:
Default values may be arbitrary expressions, but expressions containing the
`+`, `&&`, `||`, or `/` operators must be parenthesized:
```just
arch := "wasm"

5
src/analyzer.rs
View File

@ -36,12 +36,15 @@ impl<'run, 'src> Analyzer<'run, 'src> {
) -> CompileResult<'src, Justfile<'src>> {
let mut definitions = HashMap::new();
let mut imports = HashSet::new();
let mut unstable_features = BTreeSet::new();
let mut stack = Vec::new();
let ast = asts.get(root).unwrap();
stack.push(ast);
while let Some(ast) = stack.pop() {
unstable_features.extend(&ast.unstable_features);
for item in &ast.items {
match item {
Item::Alias(alias) => {
@ -166,8 +169,6 @@ impl<'run, 'src> Analyzer<'run, 'src> {
aliases.insert(Self::resolve_alias(&recipes, alias)?);
}
let mut unstable_features = BTreeSet::new();
for recipe in recipes.values() {
for attribute in &recipe.attributes {
if let Attribute::Script(_) = attribute {

130
src/assignment_resolver.rs
View File

@ -31,7 +31,29 @@ impl<'src: 'run, 'run> AssignmentResolver<'src, 'run> {
self.stack.push(name);
if let Some(assignment) = self.assignments.get(name) {
self.resolve_expression(&assignment.value)?;
for variable in assignment.value.variables() {
let name = variable.lexeme();
if self.evaluated.contains(name) || constants().contains_key(name) {
continue;
}
if self.stack.contains(&name) {
self.stack.push(name);
return Err(
self.assignments[name]
.name
.error(CircularVariableDependency {
variable: name,
circle: self.stack.clone(),
}),
);
} else if self.assignments.contains_key(name) {
self.resolve_assignment(name)?;
} else {
return Err(variable.error(UndefinedVariable { variable: name }));
}
}
self.evaluated.insert(name);
} else {
let message = format!("attempted to resolve unknown assignment `{name}`");
@ -51,112 +73,6 @@ impl<'src: 'run, 'run> AssignmentResolver<'src, 'run> {
Ok(())
}
fn resolve_expression(&mut self, expression: &Expression<'src>) -> CompileResult<'src> {
match expression {
Expression::Assert {
condition: Condition {
lhs,
rhs,
operator: _,
},
error,
} => {
self.resolve_expression(lhs)?;
self.resolve_expression(rhs)?;
self.resolve_expression(error)
}
Expression::Call { thunk } => match thunk {
Thunk::Nullary { .. } => Ok(()),
Thunk::Unary { arg, .. } => self.resolve_expression(arg),
Thunk::UnaryOpt { args: (a, b), .. } => {
self.resolve_expression(a)?;
if let Some(b) = b.as_ref() {
self.resolve_expression(b)?;
}
Ok(())
}
Thunk::UnaryPlus {
args: (a, rest), ..
} => {
self.resolve_expression(a)?;
for arg in rest {
self.resolve_expression(arg)?;
}
Ok(())
}
Thunk::Binary { args: [a, b], .. } => {
self.resolve_expression(a)?;
self.resolve_expression(b)
}
Thunk::BinaryPlus {
args: ([a, b], rest),
..
} => {
self.resolve_expression(a)?;
self.resolve_expression(b)?;
for arg in rest {
self.resolve_expression(arg)?;
}
Ok(())
}
Thunk::Ternary {
args: [a, b, c], ..
} => {
self.resolve_expression(a)?;
self.resolve_expression(b)?;
self.resolve_expression(c)
}
},
Expression::Concatenation { lhs, rhs } => {
self.resolve_expression(lhs)?;
self.resolve_expression(rhs)
}
Expression::Conditional {
condition: Condition {
lhs,
rhs,
operator: _,
},
then,
otherwise,
..
} => {
self.resolve_expression(lhs)?;
self.resolve_expression(rhs)?;
self.resolve_expression(then)?;
self.resolve_expression(otherwise)
}
Expression::Group { contents } => self.resolve_expression(contents),
Expression::Join { lhs, rhs } => {
if let Some(lhs) = lhs {
self.resolve_expression(lhs)?;
}
self.resolve_expression(rhs)
}
Expression::StringLiteral { .. } | Expression::Backtick { .. } => Ok(()),
Expression::Variable { name } => {
let variable = name.lexeme();
if self.evaluated.contains(variable) || constants().contains_key(variable) {
Ok(())
} else if self.stack.contains(&variable) {
self.stack.push(variable);
Err(
self.assignments[variable]
.name
.error(CircularVariableDependency {
variable,
circle: self.stack.clone(),
}),
)
} else if self.assignments.contains_key(variable) {
self.resolve_assignment(variable)
} else {
Err(name.token.error(UndefinedVariable { variable }))
}
}
}
}
}
#[cfg(test)]

1
src/ast.rs
View File

@ -6,6 +6,7 @@ use super::*;
#[derive(Debug, Clone)]
pub(crate) struct Ast<'src> {
pub(crate) items: Vec<Item<'src>>,
pub(crate) unstable_features: BTreeSet<UnstableFeature>,
pub(crate) warnings: Vec<Warning>,
pub(crate) working_directory: PathBuf,
}

65
src/evaluator.rs
View File

@ -84,24 +84,31 @@ impl<'src, 'run> Evaluator<'src, 'run> {
expression: &Expression<'src>,
) -> RunResult<'src, String> {
match expression {
Expression::Variable { name, .. } => {
let variable = name.lexeme();
if let Some(value) = self.scope.value(variable) {
Ok(value.to_owned())
} else if let Some(assignment) = self
.assignments
.and_then(|assignments| assignments.get(variable))
{
Ok(self.evaluate_assignment(assignment)?.to_owned())
Expression::And { lhs, rhs } => {
let lhs = self.evaluate_expression(lhs)?;
if lhs.is_empty() {
return Ok(String::new());
}
self.evaluate_expression(rhs)
}
Expression::Assert { condition, error } => {
if self.evaluate_condition(condition)? {
Ok(String::new())
} else {
Err(Error::Internal {
message: format!("attempted to evaluate undefined variable `{variable}`"),
Err(Error::Assert {
message: self.evaluate_expression(error)?,
})
}
}
Expression::Backtick { contents, token } => {
if self.context.config.dry_run {
Ok(format!("`{contents}`"))
} else {
Ok(self.run_backtick(contents, token)?)
}
}
Expression::Call { thunk } => {
use Thunk::*;
let result = match thunk {
Nullary { function, .. } => function(function::Context::new(self, thunk.name())),
Unary { function, arg, .. } => {
@ -118,7 +125,6 @@ impl<'src, 'run> Evaluator<'src, 'run> {
Some(b) => Some(self.evaluate_expression(b)?),
None => None,
};
function(function::Context::new(self, thunk.name()), &a, b.as_deref())
}
UnaryPlus {
@ -175,20 +181,11 @@ impl<'src, 'run> Evaluator<'src, 'run> {
function(function::Context::new(self, thunk.name()), &a, &b, &c)
}
};
result.map_err(|message| Error::FunctionCall {
function: thunk.name(),
message,
})
}
Expression::StringLiteral { string_literal } => Ok(string_literal.cooked.clone()),
Expression::Backtick { contents, token } => {
if self.context.config.dry_run {
Ok(format!("`{contents}`"))
} else {
Ok(self.run_backtick(contents, token)?)
}
}
Expression::Concatenation { lhs, rhs } => {
Ok(self.evaluate_expression(lhs)? + &self.evaluate_expression(rhs)?)
}
@ -209,12 +206,26 @@ impl<'src, 'run> Evaluator<'src, 'run> {
lhs: Some(lhs),
rhs,
} => Ok(self.evaluate_expression(lhs)? + "/" + &self.evaluate_expression(rhs)?),
Expression::Assert { condition, error } => {
if self.evaluate_condition(condition)? {
Ok(String::new())
Expression::Or { lhs, rhs } => {
let lhs = self.evaluate_expression(lhs)?;
if !lhs.is_empty() {
return Ok(lhs);
}
self.evaluate_expression(rhs)
}
Expression::StringLiteral { string_literal } => Ok(string_literal.cooked.clone()),
Expression::Variable { name, .. } => {
let variable = name.lexeme();
if let Some(value) = self.scope.value(variable) {
Ok(value.to_owned())
} else if let Some(assignment) = self
.assignments
.and_then(|assignments| assignments.get(variable))
{
Ok(self.evaluate_assignment(assignment)?.to_owned())
} else {
Err(Error::Assert {
message: self.evaluate_expression(error)?,
Err(Error::Internal {
message: format!("attempted to evaluate undefined variable `{variable}`"),
})
}
}

54
src/expression.rs
View File

@ -8,6 +8,11 @@ use super::*;
/// The parser parses both values and expressions into `Expression`s.
#[derive(PartialEq, Debug, Clone)]
pub(crate) enum Expression<'src> {
/// `lhs && rhs`
And {
lhs: Box<Expression<'src>>,
rhs: Box<Expression<'src>>,
},
/// `assert(condition, error)`
Assert {
condition: Condition<'src>,
@ -38,6 +43,11 @@ pub(crate) enum Expression<'src> {
lhs: Option<Box<Expression<'src>>>,
rhs: Box<Expression<'src>>,
},
/// `lhs || rhs`
Or {
lhs: Box<Expression<'src>>,
rhs: Box<Expression<'src>>,
},
/// `"string_literal"` or `'string_literal'`
StringLiteral { string_literal: StringLiteral<'src> },
/// `variable`
@ -53,23 +63,25 @@ impl<'src> Expression<'src> {
impl<'src> Display for Expression<'src> {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self {
Self::And { lhs, rhs } => write!(f, "{lhs} && {rhs}"),
Self::Assert { condition, error } => write!(f, "assert({condition}, {error})"),
Self::Backtick { token, .. } => write!(f, "{}", token.lexeme()),
Self::Join { lhs: None, rhs } => write!(f, "/ {rhs}"),
Self::Join {
lhs: Some(lhs),
rhs,
} => write!(f, "{lhs} / {rhs}"),
Self::Call { thunk } => write!(f, "{thunk}"),
Self::Concatenation { lhs, rhs } => write!(f, "{lhs} + {rhs}"),
Self::Conditional {
condition,
then,
otherwise,
} => write!(f, "if {condition} {{ {then} }} else {{ {otherwise} }}"),
Self::Group { contents } => write!(f, "({contents})"),
Self::Join { lhs: None, rhs } => write!(f, "/ {rhs}"),
Self::Join {
lhs: Some(lhs),
rhs,
} => write!(f, "{lhs} / {rhs}"),
Self::Or { lhs, rhs } => write!(f, "{lhs} || {rhs}"),
Self::StringLiteral { string_literal } => write!(f, "{string_literal}"),
Self::Variable { name } => write!(f, "{}", name.lexeme()),
Self::Call { thunk } => write!(f, "{thunk}"),
Self::Group { contents } => write!(f, "({contents})"),
}
}
}
@ -80,6 +92,13 @@ impl<'src> Serialize for Expression<'src> {
S: Serializer,
{
match self {
Self::And { lhs, rhs } => {
let mut seq = serializer.serialize_seq(None)?;
seq.serialize_element("and")?;
seq.serialize_element(lhs)?;
seq.serialize_element(rhs)?;
seq.end()
}
Self::Assert { condition, error } => {
let mut seq: <S as Serializer>::SerializeSeq = serializer.serialize_seq(None)?;
seq.serialize_element("assert")?;
@ -101,13 +120,6 @@ impl<'src> Serialize for Expression<'src> {
seq.serialize_element(rhs)?;
seq.end()
}
Self::Join { lhs, rhs } => {
let mut seq = serializer.serialize_seq(None)?;
seq.serialize_element("join")?;
seq.serialize_element(lhs)?;
seq.serialize_element(rhs)?;
seq.end()
}
Self::Conditional {
condition,
then,
@ -121,6 +133,20 @@ impl<'src> Serialize for Expression<'src> {
seq.end()
}
Self::Group { contents } => contents.serialize(serializer),
Self::Join { lhs, rhs } => {
let mut seq = serializer.serialize_seq(None)?;
seq.serialize_element("join")?;
seq.serialize_element(lhs)?;
seq.serialize_element(rhs)?;
seq.end()
}
Self::Or { lhs, rhs } => {
let mut seq = serializer.serialize_seq(None)?;
seq.serialize_element("or")?;
seq.serialize_element(lhs)?;
seq.serialize_element(rhs)?;
seq.end()
}
Self::StringLiteral { string_literal } => string_literal.serialize(serializer),
Self::Variable { name } => {
let mut seq = serializer.serialize_seq(None)?;

2
src/lexer.rs
View File

@ -496,6 +496,7 @@ impl<'src> Lexer<'src> {
']' => self.lex_delimiter(BracketR),
'`' | '"' | '\'' => self.lex_string(),
'{' => self.lex_delimiter(BraceL),
'|' => self.lex_digraph('|', '|', BarBar),
'}' => self.lex_delimiter(BraceR),
_ if Self::is_identifier_start(start) => self.lex_identifier(),
_ => {
@ -948,6 +949,7 @@ mod tests {
Asterisk => "*",
At => "@",
BangEquals => "!=",
BarBar => "||",
BraceL => "{",
BraceR => "}",
BracketL => "[",

43
src/node.rs
View File

@ -88,6 +88,7 @@ impl<'src> Node<'src> for Assignment<'src> {
impl<'src> Node<'src> for Expression<'src> {
fn tree(&self) -> Tree<'src> {
match self {
Self::And { lhs, rhs } => Tree::atom("&&").push(lhs.tree()).push(rhs.tree()),
Self::Assert {
condition: Condition { lhs, rhs, operator },
error,
@ -96,25 +97,10 @@ impl<'src> Node<'src> for Expression<'src> {
.push(operator.to_string())
.push(rhs.tree())
.push(error.tree()),
Self::Concatenation { lhs, rhs } => Tree::atom("+").push(lhs.tree()).push(rhs.tree()),
Self::Conditional {
condition: Condition { lhs, rhs, operator },
then,
otherwise,
} => {
let mut tree = Tree::atom(Keyword::If.lexeme());
tree.push_mut(lhs.tree());
tree.push_mut(operator.to_string());
tree.push_mut(rhs.tree());
tree.push_mut(then.tree());
tree.push_mut(otherwise.tree());
tree
}
Self::Backtick { contents, .. } => Tree::atom("backtick").push(Tree::string(contents)),
Self::Call { thunk } => {
use Thunk::*;
let mut tree = Tree::atom("call");
match thunk {
Nullary { name, .. } => tree.push_mut(name.lexeme()),
Unary { name, arg, .. } => {
@ -171,20 +157,33 @@ impl<'src> Node<'src> for Expression<'src> {
tree.push_mut(c.tree());
}
}
tree
}
Self::Variable { name } => Tree::atom(name.lexeme()),
Self::StringLiteral {
string_literal: StringLiteral { cooked, .. },
} => Tree::string(cooked),
Self::Backtick { contents, .. } => Tree::atom("backtick").push(Tree::string(contents)),
Self::Concatenation { lhs, rhs } => Tree::atom("+").push(lhs.tree()).push(rhs.tree()),
Self::Conditional {
condition: Condition { lhs, rhs, operator },
then,
otherwise,
} => {
let mut tree = Tree::atom(Keyword::If.lexeme());
tree.push_mut(lhs.tree());
tree.push_mut(operator.to_string());
tree.push_mut(rhs.tree());
tree.push_mut(then.tree());
tree.push_mut(otherwise.tree());
tree
}
Self::Group { contents } => Tree::List(vec![contents.tree()]),
Self::Join { lhs: None, rhs } => Tree::atom("/").push(rhs.tree()),
Self::Join {
lhs: Some(lhs),
rhs,
} => Tree::atom("/").push(lhs.tree()).push(rhs.tree()),
Self::Or { lhs, rhs } => Tree::atom("||").push(lhs.tree()).push(rhs.tree()),
Self::StringLiteral {
string_literal: StringLiteral { cooked, .. },
} => Tree::string(cooked),
Self::Variable { name } => Tree::atom(name.lexeme()),
}
}
}

91
src/parser.rs
View File

@ -31,6 +31,7 @@ pub(crate) struct Parser<'run, 'src> {
next_token: usize,
recursion_depth: usize,
tokens: &'run [Token<'src>],
unstable_features: BTreeSet<UnstableFeature>,
working_directory: &'run Path,
}
@ -51,6 +52,7 @@ impl<'run, 'src> Parser<'run, 'src> {
next_token: 0,
recursion_depth: 0,
tokens,
unstable_features: BTreeSet::new(),
working_directory,
}
.parse_ast()
@ -442,18 +444,19 @@ impl<'run, 'src> Parser<'run, 'src> {
}
}
if self.next_token == self.tokens.len() {
Ok(Ast {
items,
warnings: Vec::new(),
working_directory: self.working_directory.into(),
})
} else {
Err(self.internal_error(format!(
if self.next_token != self.tokens.len() {
return Err(self.internal_error(format!(
"Parse completed with {} unparsed tokens",
self.tokens.len() - self.next_token,
))?)
))?);
}
Ok(Ast {
items,
unstable_features: self.unstable_features,
warnings: Vec::new(),
working_directory: self.working_directory.into(),
})
}
/// Parse an alias, e.g `alias name := target`
@ -517,26 +520,17 @@ impl<'run, 'src> Parser<'run, 'src> {
self.recursion_depth += 1;
let expression = if self.accepted_keyword(Keyword::If)? {
self.parse_conditional()?
} else if self.accepted(Slash)? {
let lhs = None;
let rhs = self.parse_expression()?.into();
Expression::Join { lhs, rhs }
} else {
let value = self.parse_value()?;
let disjunct = self.parse_disjunct()?;
if self.accepted(Slash)? {
let lhs = Some(Box::new(value));
let rhs = self.parse_expression()?.into();
Expression::Join { lhs, rhs }
} else if self.accepted(Plus)? {
let lhs = value.into();
let rhs = self.parse_expression()?.into();
Expression::Concatenation { lhs, rhs }
} else {
value
}
let expression = if self.accepted(BarBar)? {
self
.unstable_features
.insert(UnstableFeature::LogicalOperators);
let lhs = disjunct.into();
let rhs = self.parse_expression()?.into();
Expression::Or { lhs, rhs }
} else {
disjunct
};
self.recursion_depth -= 1;
@ -544,6 +538,47 @@ impl<'run, 'src> Parser<'run, 'src> {
Ok(expression)
}
fn parse_disjunct(&mut self) -> CompileResult<'src, Expression<'src>> {
let conjunct = self.parse_conjunct()?;
let disjunct = if self.accepted(AmpersandAmpersand)? {
self
.unstable_features
.insert(UnstableFeature::LogicalOperators);
let lhs = conjunct.into();
let rhs = self.parse_disjunct()?.into();
Expression::And { lhs, rhs }
} else {
conjunct
};
Ok(disjunct)
}
fn parse_conjunct(&mut self) -> CompileResult<'src, Expression<'src>> {
if self.accepted_keyword(Keyword::If)? {
self.parse_conditional()
} else if self.accepted(Slash)? {
let lhs = None;
let rhs = self.parse_conjunct()?.into();
Ok(Expression::Join { lhs, rhs })
} else {
let value = self.parse_value()?;
if self.accepted(Slash)? {
let lhs = Some(Box::new(value));
let rhs = self.parse_conjunct()?.into();
Ok(Expression::Join { lhs, rhs })
} else if self.accepted(Plus)? {
let lhs = value.into();
let rhs = self.parse_conjunct()?.into();
Ok(Expression::Concatenation { lhs, rhs })
} else {
Ok(value)
}
}
}
/// Parse a conditional, e.g. `if a == b { "foo" } else { "bar" }`
fn parse_conditional(&mut self) -> CompileResult<'src, Expression<'src>> {
let condition = self.parse_condition()?;

28
src/summary.rs
View File

@ -183,6 +183,10 @@ impl Assignment {
#[derive(Eq, PartialEq, Hash, Ord, PartialOrd, Debug, Clone)]
pub enum Expression {
And {
lhs: Box<Expression>,
rhs: Box<Expression>,
},
Assert {
condition: Condition,
error: Box<Expression>,
@ -209,6 +213,10 @@ pub enum Expression {
lhs: Option<Box<Expression>>,
rhs: Box<Expression>,
},
Or {
lhs: Box<Expression>,
rhs: Box<Expression>,
},
String {
text: String,
},
@ -221,6 +229,10 @@ impl Expression {
fn new(expression: &full::Expression) -> Self {
use full::Expression::*;
match expression {
And { lhs, rhs } => Self::And {
lhs: Self::new(lhs).into(),
rhs: Self::new(rhs).into(),
},
Assert {
condition: full::Condition { lhs, rhs, operator },
error,
@ -250,11 +262,9 @@ impl Expression {
..
} => {
let mut arguments = Vec::new();
if let Some(b) = opt_b.as_ref() {
arguments.push(Self::new(b));
}
arguments.push(Self::new(a));
Self::Call {
name: name.lexeme().to_owned(),
@ -308,10 +318,6 @@ impl Expression {
lhs: Self::new(lhs).into(),
rhs: Self::new(rhs).into(),
},
Join { lhs, rhs } => Self::Join {
lhs: lhs.as_ref().map(|lhs| Self::new(lhs).into()),
rhs: Self::new(rhs).into(),
},
Conditional {
condition: full::Condition { lhs, rhs, operator },
otherwise,
@ -323,13 +329,21 @@ impl Expression {
rhs: Self::new(rhs).into(),
then: Self::new(then).into(),
},
Group { contents } => Self::new(contents),
Join { lhs, rhs } => Self::Join {
lhs: lhs.as_ref().map(|lhs| Self::new(lhs).into()),
rhs: Self::new(rhs).into(),
},
Or { lhs, rhs } => Self::Or {
lhs: Self::new(lhs).into(),
rhs: Self::new(rhs).into(),
},
StringLiteral { string_literal } => Self::String {
text: string_literal.cooked.clone(),
},
Variable { name, .. } => Self::Variable {
name: name.lexeme().to_owned(),
},
Group { contents } => Self::new(contents),
}
}
}

2
src/token_kind.rs
View File

@ -7,6 +7,7 @@ pub(crate) enum TokenKind {
At,
Backtick,
BangEquals,
BarBar,
BraceL,
BraceR,
BracketL,
@ -50,6 +51,7 @@ impl Display for TokenKind {
At => "'@'",
Backtick => "backtick",
BangEquals => "'!='",
BarBar => "'||'",
BraceL => "'{'",
BraceR => "'}'",
BracketL => "'['",

5
src/unstable_feature.rs
View File

@ -3,6 +3,7 @@ use super::*;
#[derive(Copy, Clone, Debug, PartialEq, Ord, Eq, PartialOrd)]
pub(crate) enum UnstableFeature {
FormatSubcommand,
LogicalOperators,
ScriptAttribute,
ScriptInterpreterSetting,
}
@ -11,6 +12,10 @@ impl Display for UnstableFeature {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self {
Self::FormatSubcommand => write!(f, "The `--fmt` command is currently unstable."),
Self::LogicalOperators => write!(
f,
"The logical operators `&&` and `||` are currently unstable."
),
Self::ScriptAttribute => write!(f, "The `[script]` attribute is currently unstable."),
Self::ScriptInterpreterSetting => {
write!(f, "The `script-interpreter` setting is currently unstable.")

46
src/variables.rs
View File

@ -16,7 +16,24 @@ impl<'expression, 'src> Iterator for Variables<'expression, 'src> {
fn next(&mut self) -> Option<Token<'src>> {
loop {
match self.stack.pop()? {
Expression::StringLiteral { .. } | Expression::Backtick { .. } => {}
Expression::And { lhs, rhs } | Expression::Or { lhs, rhs } => {
self.stack.push(lhs);
self.stack.push(rhs);
}
Expression::Assert {
condition:
Condition {
lhs,
rhs,
operator: _,
},
error,
} => {
self.stack.push(error);
self.stack.push(rhs);
self.stack.push(lhs);
}
Expression::Backtick { .. } | Expression::StringLiteral { .. } => {}
Expression::Call { thunk } => match thunk {
Thunk::Nullary { .. } => {}
Thunk::Unary { arg, .. } => self.stack.push(arg),
@ -56,6 +73,10 @@ impl<'expression, 'src> Iterator for Variables<'expression, 'src> {
}
}
},
Expression::Concatenation { lhs, rhs } => {
self.stack.push(rhs);
self.stack.push(lhs);
}
Expression::Conditional {
condition:
Condition {
@ -71,10 +92,8 @@ impl<'expression, 'src> Iterator for Variables<'expression, 'src> {
self.stack.push(rhs);
self.stack.push(lhs);
}
Expression::Variable { name, .. } => return Some(name.token),
Expression::Concatenation { lhs, rhs } => {
self.stack.push(rhs);
self.stack.push(lhs);
Expression::Group { contents } => {
self.stack.push(contents);
}
Expression::Join { lhs, rhs } => {
self.stack.push(rhs);
@ -82,22 +101,7 @@ impl<'expression, 'src> Iterator for Variables<'expression, 'src> {
self.stack.push(lhs);
}
}
Expression::Group { contents } => {
self.stack.push(contents);
}
Expression::Assert {
condition:
Condition {
lhs,
rhs,
operator: _,
},
error,
} => {
self.stack.push(error);
self.stack.push(rhs);
self.stack.push(lhs);
}
Expression::Variable { name, .. } => return Some(name.token),
}
}
}

1
tests/assert_success.rs
View File

@ -1,3 +1,4 @@
#[track_caller]
pub(crate) fn assert_success(output: &std::process::Output) {
if !output.status.success() {
eprintln!("stderr: {}", String::from_utf8_lossy(&output.stderr));

2
tests/conditional.rs
View File

@ -136,7 +136,7 @@ test! {
",
stdout: "",
stderr: "
error: Expected '!=', '==', '=~', '+', or '/', but found identifier
error: Expected '&&', '!=', '||', '==', '=~', '+', or '/', but found identifier
——▶ justfile:1:12
│
1 │ a := if '' a '' { '' } else { b }

2
tests/ignore_comments.rs
View File

@ -125,7 +125,7 @@ fn comments_still_must_be_parsable_when_ignored() {
)
.stderr(
"
error: Expected '}}', '(', '+', or '/', but found identifier
error: Expected '&&', '||', '}}', '(', '+', or '/', but found identifier
——▶ justfile:4:12
│
4 │ # {{ foo bar }}

1
tests/lib.rs
View File

@ -73,6 +73,7 @@ mod invocation_directory;
mod json;
mod line_prefixes;
mod list;
mod logical_operators;
mod man;
mod misc;
mod modules;

83
tests/logical_operators.rs Normal file
View File

@ -0,0 +1,83 @@
use super::*;
#[track_caller]
fn evaluate(expression: &str, expected: &str) {
Test::new()
.justfile(format!("x := {expression}"))
.env("JUST_UNSTABLE", "1")
.args(["--evaluate", "x"])
.stdout(expected)
.run();
}
#[test]
fn logical_operators_are_unstable() {
Test::new()
.justfile("x := 'foo' && 'bar'")
.args(["--evaluate", "x"])
.stderr_regex(r"error: The logical operators `&&` and `\|\|` are currently unstable. .*")
.status(EXIT_FAILURE)
.run();
Test::new()
.justfile("x := 'foo' || 'bar'")
.args(["--evaluate", "x"])
.stderr_regex(r"error: The logical operators `&&` and `\|\|` are currently unstable. .*")
.status(EXIT_FAILURE)
.run();
}
#[test]
fn and_returns_empty_string_if_lhs_is_empty() {
evaluate("'' && 'hello'", "");
}
#[test]
fn and_returns_rhs_if_lhs_is_non_empty() {
evaluate("'hello' && 'goodbye'", "goodbye");
}
#[test]
fn and_has_lower_precedence_than_plus() {
evaluate("'' && 'goodbye' + 'foo'", "");
evaluate("'foo' + 'hello' && 'goodbye'", "goodbye");
evaluate("'foo' + '' && 'goodbye'", "goodbye");
evaluate("'foo' + 'hello' && 'goodbye' + 'bar'", "goodbyebar");
}
#[test]
fn or_returns_rhs_if_lhs_is_empty() {
evaluate("'' || 'hello'", "hello");
}
#[test]
fn or_returns_lhs_if_lhs_is_non_empty() {
evaluate("'hello' || 'goodbye'", "hello");
}
#[test]
fn or_has_lower_precedence_than_plus() {
evaluate("'' || 'goodbye' + 'foo'", "goodbyefoo");
evaluate("'foo' + 'hello' || 'goodbye'", "foohello");
evaluate("'foo' + '' || 'goodbye'", "foo");
evaluate("'foo' + 'hello' || 'goodbye' + 'bar'", "foohello");
}
#[test]
fn and_has_higher_precedence_than_or() {
evaluate("('' && 'foo') || 'bar'", "bar");
evaluate("'' && 'foo' || 'bar'", "bar");
evaluate("'a' && 'b' || 'c'", "b");
}
#[test]
fn nesting() {
evaluate("'' || '' || '' || '' || 'foo'", "foo");
evaluate("'foo' && 'foo' && 'foo' && 'foo' && 'bar'", "bar");
}

2
tests/shell_expansion.rs
View File

@ -25,7 +25,7 @@ fn shell_expanded_strings_must_not_have_whitespace() {
.status(1)
.stderr(
"
error: Expected comment, end of file, end of line, '(', '+', or '/', but found string
error: Expected '&&', '||', comment, end of file, end of line, '(', '+', or '/', but found string
——▶ justfile:1:8
│
1 │ x := x '$JUST_TEST_VARIABLE'