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Switch tables to list/streams of records

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This commit is contained in:
JT 2021-09-07 19:07:11 +12:00
parent 2055b83c34
commit b0ab78a767
11 changed files with 75 additions and 165 deletions
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2
TODO.md
View File

@ -23,7 +23,7 @@
- [ ] Source
- [ ] Autoenv
- [ ] Externals
- [ ] let [first, rest] = [1, 2, 3]
- [ ] let [first, rest] = [1, 2, 3] (design question: how do you pattern match a table?)
## Maybe:
- [ ] default param values?

4
crates/nu-cli/src/errors.rs
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@ -348,9 +348,9 @@ pub fn report_shell_error(
let (diag_file_id, diag_range) = convert_span_to_diag(working_set, span)?;
Diagnostic::error()
.with_message("Data cannot be accessed with a column path")
.with_message("Data cannot be accessed with a cell path")
.with_labels(vec![Label::primary(diag_file_id, diag_range)
.with_message(format!("{} doesn't support column paths", name))])
.with_message(format!("{} doesn't support cell paths", name))])
}
ShellError::CantFindColumn(span) => {
let (diag_file_id, diag_range) = convert_span_to_diag(working_set, span)?;

4
crates/nu-command/src/each.rs
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@ -52,7 +52,7 @@ impl Command for Each {
.into_value_stream(),
span: call.head,
}),
Value::List { val, .. } => Ok(Value::ValueStream {
Value::List { vals: val, .. } => Ok(Value::ValueStream {
stream: val
.into_iter()
.map(move |x| {
@ -95,8 +95,6 @@ impl Command for Each {
.into_value_stream(),
span: call.head,
}),
Value::RowStream { .. } => panic!("iterating row streams is not yet supported"),
Value::Table { .. } => panic!("table iteration not yet supported"),
x => {
//TODO: we need to watch to make sure this is okay
let engine_state = context.engine_state.borrow();

4
crates/nu-command/src/for_.rs
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@ -68,8 +68,8 @@ impl Command for For {
.into_value_stream(),
span: call.head,
}),
Value::List { val, .. } => Ok(Value::List {
val: val
Value::List { vals: val, .. } => Ok(Value::List {
vals: val
.into_iter()
.map(move |x| {
let engine_state = context.engine_state.borrow();

18
crates/nu-command/src/length.rs
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@ -24,15 +24,7 @@ impl Command for Length {
input: Value,
) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
match input {
Value::List { val, .. } => {
let length = val.len();
Ok(Value::Int {
val: length as i64,
span: call.head,
})
}
Value::Table { val, .. } => {
Value::List { vals: val, .. } => {
let length = val.len();
Ok(Value::Int {
@ -48,14 +40,6 @@ impl Command for Length {
span: call.head,
})
}
Value::RowStream { stream, .. } => {
let length = stream.count();
Ok(Value::Int {
val: length as i64,
span: call.head,
})
}
Value::Nothing { .. } => Ok(Value::Int {
val: 0,
span: call.head,

17
crates/nu-engine/src/eval.rs
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@ -55,7 +55,7 @@ fn eval_call(context: &EvaluationContext, call: &Call, input: Value) -> Result<V
.var_id
.expect("Internal error: rest positional parameter lacks var_id"),
Value::List {
val: rest_items,
vals: rest_items,
span,
},
)
@ -133,7 +133,7 @@ pub fn eval_expression(
Expr::FullCellPath(column_path) => {
let value = eval_expression(context, &column_path.head)?;
value.follow_column_path(&column_path.tail)
value.follow_cell_path(&column_path.tail)
}
Expr::Call(call) => eval_call(context, call, Value::nothing()),
Expr::ExternalCall(_, _) => Err(ShellError::ExternalNotSupported(expr.span)),
@ -176,7 +176,7 @@ pub fn eval_expression(
output.push(eval_expression(context, expr)?);
}
Ok(Value::List {
val: output,
vals: output,
span: expr.span,
})
}
@ -192,11 +192,14 @@ pub fn eval_expression(
for expr in val {
row.push(eval_expression(context, expr)?);
}
output_rows.push(row);
output_rows.push(Value::Record {
cols: output_headers.clone(),
vals: row,
span: expr.span,
});
}
Ok(Value::Table {
headers: output_headers,
val: output_rows,
Ok(Value::List {
vals: output_rows,
span: expr.span,
})
}

6
crates/nu-parser/src/parser.rs
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@ -1781,7 +1781,7 @@ pub fn parse_table_expression(
Expression {
expr: Expr::List(vec![]),
span,
ty: Type::Table,
ty: Type::List(Box::new(Type::Unknown)),
},
None,
),
@ -1828,7 +1828,7 @@ pub fn parse_table_expression(
Expression {
expr: Expr::Table(table_headers, rows),
span,
ty: Type::Table,
ty: Type::List(Box::new(Type::Unknown)),
},
error,
)
@ -1965,7 +1965,7 @@ pub fn parse_value(
// First, check the special-cases. These will likely represent specific values as expressions
// and may fit a variety of shapes.
//
// We check variable first because immediately following we check for variables with column paths
// We check variable first because immediately following we check for variables with cell paths
// which might result in a value that fits other shapes (and require the variable to already be
// declared)
if shape == &SyntaxShape::Variable {

11
crates/nu-protocol/src/engine/evaluation_context.rs
View File

@ -29,17 +29,8 @@ impl EvaluationContext {
// TODO: add ctrl-c support
let value = match value {
Value::RowStream {
headers,
stream,
span,
} => Value::Table {
headers,
val: stream.collect(),
span,
},
Value::ValueStream { stream, span } => Value::List {
val: stream.collect(),
vals: stream.collect(),
span,
},
x => x,

2
crates/nu-protocol/src/syntax_shape.rs
View File

@ -96,7 +96,7 @@ impl SyntaxShape {
SyntaxShape::RowCondition => Type::Bool,
SyntaxShape::Signature => Type::Unknown,
SyntaxShape::String => Type::String,
SyntaxShape::Table => Type::Table,
SyntaxShape::Table => Type::List(Box::new(Type::Unknown)), // FIXME
SyntaxShape::VarWithOptType => Type::Unknown,
SyntaxShape::Variable => Type::Unknown,
}

6
crates/nu-protocol/src/ty.rs
View File

@ -15,8 +15,7 @@ pub enum Type {
List(Box<Type>),
Number,
Nothing,
Table,
RowStream,
Record(Vec<String>, Vec<Type>),
ValueStream,
Unknown,
Error,
@ -34,13 +33,12 @@ impl Display for Type {
Type::Float => write!(f, "float"),
Type::Int => write!(f, "int"),
Type::Range => write!(f, "range"),
Type::Record(cols, vals) => write!(f, "record<{}, {:?}>", cols.join(", "), vals),
Type::List(l) => write!(f, "list<{}>", l),
Type::Nothing => write!(f, "nothing"),
Type::Number => write!(f, "number"),
Type::String => write!(f, "string"),
Type::Table => write!(f, "table"),
Type::ValueStream => write!(f, "value stream"),
Type::RowStream => write!(f, "row stream"),
Type::Unknown => write!(f, "unknown"),
Type::Error => write!(f, "error"),
}

162
crates/nu-protocol/src/value.rs
View File

@ -247,22 +247,17 @@ pub enum Value {
val: String,
span: Span,
},
Record {
cols: Vec<String>,
vals: Vec<Value>,
span: Span,
},
ValueStream {
stream: ValueStream,
span: Span,
},
RowStream {
headers: Vec<String>,
stream: RowStream,
span: Span,
},
List {
val: Vec<Value>,
span: Span,
},
Table {
headers: Vec<String>,
val: Vec<Vec<Value>>,
vals: Vec<Value>,
span: Span,
},
Block {
@ -292,10 +287,9 @@ impl Value {
Value::Float { span, .. } => *span,
Value::Range { span, .. } => *span,
Value::String { span, .. } => *span,
Value::Record { span, .. } => *span,
Value::List { span, .. } => *span,
Value::Table { span, .. } => *span,
Value::Block { span, .. } => *span,
Value::RowStream { span, .. } => *span,
Value::ValueStream { span, .. } => *span,
Value::Nothing { span, .. } => *span,
Value::Error { .. } => Span::unknown(),
@ -309,10 +303,9 @@ impl Value {
Value::Float { span, .. } => *span = new_span,
Value::Range { span, .. } => *span = new_span,
Value::String { span, .. } => *span = new_span,
Value::RowStream { span, .. } => *span = new_span,
Value::Record { span, .. } => *span = new_span,
Value::ValueStream { span, .. } => *span = new_span,
Value::List { span, .. } => *span = new_span,
Value::Table { span, .. } => *span = new_span,
Value::Block { span, .. } => *span = new_span,
Value::Nothing { span, .. } => *span = new_span,
Value::Error { .. } => {}
@ -328,12 +321,13 @@ impl Value {
Value::Float { .. } => Type::Float,
Value::Range { .. } => Type::Range,
Value::String { .. } => Type::String,
Value::Record { cols, vals, .. } => {
Type::Record(cols.clone(), vals.iter().map(|x| x.get_type()).collect())
}
Value::List { .. } => Type::List(Box::new(Type::Unknown)), // FIXME
Value::Table { .. } => Type::Table, // FIXME
Value::Nothing { .. } => Type::Nothing,
Value::Block { .. } => Type::Block,
Value::ValueStream { .. } => Type::ValueStream,
Value::RowStream { .. } => Type::RowStream,
Value::Error { .. } => Type::Error,
}
}
@ -364,29 +358,21 @@ impl Value {
}
Value::String { val, .. } => val,
Value::ValueStream { stream, .. } => stream.into_string(),
Value::List { val, .. } => format!(
Value::List { vals: val, .. } => format!(
"[{}]",
val.into_iter()
.map(|x| x.into_string())
.collect::<Vec<_>>()
.join(", ")
),
Value::Table { val, headers, .. } => format!(
"[= {} =\n {}]",
headers.join(", "),
val.into_iter()
.map(|x| {
x.into_iter()
.map(|x| x.into_string())
Value::Record { cols, vals, .. } => format!(
"{{{}}}",
cols.iter()
.zip(vals.iter())
.map(|(x, y)| format!("{}: {}", x, y.clone().into_string()))
.collect::<Vec<_>>()
.join(", ")
})
.collect::<Vec<_>>()
.join("\n")
),
Value::RowStream {
headers, stream, ..
} => stream.into_string(headers),
Value::Block { val, .. } => format!("<Block {}>", val),
Value::Nothing { .. } => String::new(),
Value::Error { error } => format!("{:?}", error),
@ -399,7 +385,7 @@ impl Value {
}
}
pub fn follow_column_path(self, column_path: &[PathMember]) -> Result<Value, ShellError> {
pub fn follow_cell_path(self, column_path: &[PathMember]) -> Result<Value, ShellError> {
let mut current = self;
for member in column_path {
// FIXME: this uses a few extra clones for simplicity, but there may be a way
@ -411,7 +397,7 @@ impl Value {
} => {
// Treat a numeric path member as `nth <val>`
match &mut current {
Value::List { val, .. } => {
Value::List { vals: val, .. } => {
if let Some(item) = val.get(*count) {
current = item.clone();
} else {
@ -425,32 +411,6 @@ impl Value {
return Err(ShellError::AccessBeyondEndOfStream(*origin_span));
}
}
Value::Table { headers, val, span } => {
if let Some(row) = val.get(*count) {
current = Value::Table {
headers: headers.clone(),
val: vec![row.clone()],
span: *span,
}
} else {
return Err(ShellError::AccessBeyondEnd(val.len(), *origin_span));
}
}
Value::RowStream {
headers,
stream,
span,
} => {
if let Some(row) = stream.nth(*count) {
current = Value::Table {
headers: headers.clone(),
val: vec![row.clone()],
span: *span,
}
} else {
return Err(ShellError::AccessBeyondEndOfStream(*origin_span));
}
}
x => {
return Err(ShellError::IncompatiblePathAccess(
format!("{}", x.get_type()),
@ -460,28 +420,15 @@ impl Value {
}
}
PathMember::String {
val,
val: column_name,
span: origin_span,
} => match &mut current {
Value::Table {
headers,
val: cells,
span,
} => {
Value::Record { cols, vals, .. } => {
let mut found = false;
for header in headers.iter().enumerate() {
if header.1 == val {
for col in cols.iter().zip(vals.iter()) {
if col.0 == column_name {
current = col.1.clone();
found = true;
let mut column = vec![];
for row in cells {
column.push(row[header.0].clone())
}
current = Value::List {
val: column,
span: *span,
};
break;
}
}
@ -490,33 +437,22 @@ impl Value {
return Err(ShellError::CantFindColumn(*origin_span));
}
}
Value::RowStream {
headers,
stream,
span,
} => {
let mut found = false;
for header in headers.iter().enumerate() {
if header.1 == val {
found = true;
let mut column = vec![];
for row in stream {
column.push(row[header.0].clone())
Value::List { vals, span } => {
let mut output = vec![];
for val in vals {
if let Value::Record { cols, vals, .. } = val {
for col in cols.iter().enumerate() {
if col.1 == column_name {
output.push(vals[col.0].clone());
}
}
}
}
current = Value::List {
val: column,
vals: output,
span: *span,
};
break;
}
}
if !found {
//FIXME: add "did you mean"
return Err(ShellError::CantFindColumn(*origin_span));
}
}
x => {
return Err(ShellError::IncompatiblePathAccess(
@ -844,19 +780,19 @@ impl Value {
val: lhs == rhs,
span,
}),
(Value::List { val: lhs, .. }, Value::List { val: rhs, .. }) => Ok(Value::Bool {
(Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
val: lhs == rhs,
span,
}),
(
Value::Table {
val: lhs,
headers: lhs_headers,
Value::Record {
vals: lhs,
cols: lhs_headers,
..
},
Value::Table {
val: rhs,
headers: rhs_headers,
Value::Record {
vals: rhs,
cols: rhs_headers,
..
},
) => Ok(Value::Bool {
@ -899,19 +835,19 @@ impl Value {
val: lhs != rhs,
span,
}),
(Value::List { val: lhs, .. }, Value::List { val: rhs, .. }) => Ok(Value::Bool {
(Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
val: lhs != rhs,
span,
}),
(
Value::Table {
val: lhs,
headers: lhs_headers,
Value::Record {
vals: lhs,
cols: lhs_headers,
..
},
Value::Table {
val: rhs,
headers: rhs_headers,
Value::Record {
vals: rhs,
cols: rhs_headers,
..
},
) => Ok(Value::Bool {