forked from extern/nushell
697 lines
24 KiB
Rust
697 lines
24 KiB
Rust
mod range;
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mod row;
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mod stream;
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pub use range::*;
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pub use row::*;
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pub use stream::*;
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use std::fmt::Debug;
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use crate::ast::{PathMember, RangeInclusion};
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use crate::{span, BlockId, Span, Type};
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use crate::ShellError;
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/// Core structured values that pass through the pipeline in engine-q
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#[derive(Debug, Clone)]
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pub enum Value {
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Bool {
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val: bool,
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span: Span,
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},
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Int {
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val: i64,
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span: Span,
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},
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Range {
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val: Box<Range>,
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span: Span,
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},
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Float {
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val: f64,
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span: Span,
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},
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String {
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val: String,
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span: Span,
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},
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Record {
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cols: Vec<String>,
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vals: Vec<Value>,
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span: Span,
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},
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Stream {
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stream: ValueStream,
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span: Span,
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},
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List {
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vals: Vec<Value>,
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span: Span,
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},
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Block {
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val: BlockId,
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span: Span,
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},
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Nothing {
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span: Span,
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},
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Error {
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error: ShellError,
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},
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}
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impl Value {
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pub fn as_string(&self) -> Result<String, ShellError> {
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match self {
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Value::String { val, .. } => Ok(val.to_string()),
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_ => Err(ShellError::CantConvert("string".into(), self.span())),
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}
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}
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/// Get the span for the current value
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pub fn span(&self) -> Span {
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match self {
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Value::Error { .. } => Span::unknown(),
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Value::Bool { span, .. } => *span,
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Value::Int { span, .. } => *span,
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Value::Float { span, .. } => *span,
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Value::Range { span, .. } => *span,
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Value::String { span, .. } => *span,
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Value::Record { span, .. } => *span,
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Value::List { span, .. } => *span,
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Value::Block { span, .. } => *span,
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Value::Stream { span, .. } => *span,
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Value::Nothing { span, .. } => *span,
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}
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}
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/// Update the value with a new span
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pub fn with_span(mut self, new_span: Span) -> Value {
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match &mut self {
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Value::Bool { span, .. } => *span = new_span,
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Value::Int { span, .. } => *span = new_span,
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Value::Float { span, .. } => *span = new_span,
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Value::Range { span, .. } => *span = new_span,
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Value::String { span, .. } => *span = new_span,
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Value::Record { span, .. } => *span = new_span,
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Value::Stream { span, .. } => *span = new_span,
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Value::List { span, .. } => *span = new_span,
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Value::Block { span, .. } => *span = new_span,
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Value::Nothing { span, .. } => *span = new_span,
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Value::Error { .. } => {}
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}
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self
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}
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/// Get the type of the current Value
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pub fn get_type(&self) -> Type {
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match self {
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Value::Bool { .. } => Type::Bool,
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Value::Int { .. } => Type::Int,
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Value::Float { .. } => Type::Float,
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Value::Range { .. } => Type::Range,
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Value::String { .. } => Type::String,
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Value::Record { cols, vals, .. } => {
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Type::Record(cols.clone(), vals.iter().map(|x| x.get_type()).collect())
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}
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Value::List { .. } => Type::List(Box::new(Type::Unknown)), // FIXME
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Value::Nothing { .. } => Type::Nothing,
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Value::Block { .. } => Type::Block,
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Value::Stream { .. } => Type::ValueStream,
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Value::Error { .. } => Type::Error,
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}
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}
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/// Convert Value into string. Note that Streams will be consumed.
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pub fn into_string(self) -> String {
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match self {
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Value::Bool { val, .. } => val.to_string(),
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Value::Int { val, .. } => val.to_string(),
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Value::Float { val, .. } => val.to_string(),
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Value::Range { val, .. } => {
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let vals: Vec<i64> = match (&val.from, &val.to) {
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(Value::Int { val: from, .. }, Value::Int { val: to, .. }) => {
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match val.inclusion {
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RangeInclusion::Inclusive => (*from..=*to).collect(),
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RangeInclusion::RightExclusive => (*from..*to).collect(),
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}
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}
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_ => Vec::new(),
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};
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format!(
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"range: [{}]",
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vals.iter()
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.map(|x| x.to_string())
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.collect::<Vec<String>>()
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.join(", ")
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)
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}
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Value::String { val, .. } => val,
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Value::Stream { stream, .. } => stream.into_string(),
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Value::List { vals: val, .. } => format!(
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"[{}]",
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val.into_iter()
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.map(|x| x.into_string())
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.collect::<Vec<_>>()
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.join(", ")
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),
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Value::Record { cols, vals, .. } => format!(
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"{{{}}}",
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cols.iter()
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.zip(vals.iter())
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.map(|(x, y)| format!("{}: {}", x, y.clone().into_string()))
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.collect::<Vec<_>>()
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.join(", ")
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),
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Value::Block { val, .. } => format!("<Block {}>", val),
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Value::Nothing { .. } => String::new(),
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Value::Error { error } => format!("{:?}", error),
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}
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}
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/// Create a new `Nothing` value
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pub fn nothing() -> Value {
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Value::Nothing {
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span: Span::unknown(),
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}
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}
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pub fn follow_cell_path(self, column_path: &[PathMember]) -> Result<Value, ShellError> {
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let mut current = self;
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for member in column_path {
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// FIXME: this uses a few extra clones for simplicity, but there may be a way
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// to traverse the path without them
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match member {
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PathMember::Int {
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val: count,
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span: origin_span,
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} => {
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// Treat a numeric path member as `nth <val>`
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match &mut current {
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Value::List { vals: val, .. } => {
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if let Some(item) = val.get(*count) {
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current = item.clone();
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} else {
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return Err(ShellError::AccessBeyondEnd(val.len(), *origin_span));
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}
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}
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Value::Stream { stream, .. } => {
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if let Some(item) = stream.nth(*count) {
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current = item;
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} else {
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return Err(ShellError::AccessBeyondEndOfStream(*origin_span));
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}
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}
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x => {
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return Err(ShellError::IncompatiblePathAccess(
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format!("{}", x.get_type()),
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*origin_span,
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))
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}
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}
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}
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PathMember::String {
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val: column_name,
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span: origin_span,
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} => match &mut current {
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Value::Record { cols, vals, .. } => {
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let mut found = false;
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for col in cols.iter().zip(vals.iter()) {
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if col.0 == column_name {
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current = col.1.clone();
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found = true;
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break;
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}
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}
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if !found {
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return Err(ShellError::CantFindColumn(*origin_span));
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}
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}
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Value::List { vals, span } => {
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let mut output = vec![];
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for val in vals {
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if let Value::Record { cols, vals, .. } = val {
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for col in cols.iter().enumerate() {
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if col.1 == column_name {
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output.push(vals[col.0].clone());
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}
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}
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}
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}
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current = Value::List {
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vals: output,
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span: *span,
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};
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}
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Value::Stream { stream, span } => {
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let mut output = vec![];
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for val in stream {
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if let Value::Record { cols, vals, .. } = val {
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for col in cols.iter().enumerate() {
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if col.1 == column_name {
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output.push(vals[col.0].clone());
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}
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}
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}
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}
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current = Value::List {
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vals: output,
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span: *span,
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};
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}
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x => {
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return Err(ShellError::IncompatiblePathAccess(
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format!("{}", x.get_type()),
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*origin_span,
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))
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}
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},
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}
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}
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Ok(current)
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}
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pub fn string(s: &str, span: Span) -> Value {
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Value::String {
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val: s.into(),
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span,
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}
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}
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pub fn is_true(&self) -> bool {
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matches!(self, Value::Bool { val: true, .. })
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}
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pub fn columns(&self) -> Vec<String> {
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match self {
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Value::Record { cols, .. } => cols.clone(),
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_ => vec![],
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}
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}
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}
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impl PartialEq for Value {
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fn eq(&self, other: &Self) -> bool {
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match (self, other) {
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(Value::Bool { val: lhs, .. }, Value::Bool { val: rhs, .. }) => lhs == rhs,
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => lhs == rhs,
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => lhs == rhs,
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(Value::String { val: lhs, .. }, Value::String { val: rhs, .. }) => lhs == rhs,
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(Value::Block { val: b1, .. }, Value::Block { val: b2, .. }) => b1 == b2,
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_ => false,
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}
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}
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}
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impl Value {
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pub fn add(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Int {
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val: lhs + rhs,
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span,
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}),
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs as f64 + *rhs,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs + *rhs as f64,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: lhs + rhs,
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span,
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}),
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(Value::String { val: lhs, .. }, Value::String { val: rhs, .. }) => Ok(Value::String {
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val: lhs.to_string() + rhs,
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span,
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}),
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn sub(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Int {
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val: lhs - rhs,
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span,
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}),
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs as f64 - *rhs,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs - *rhs as f64,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: lhs - rhs,
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span,
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}),
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn mul(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Int {
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val: lhs * rhs,
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span,
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}),
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs as f64 * *rhs,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Float {
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val: *lhs * *rhs as f64,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Float {
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val: lhs * rhs,
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span,
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}),
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn div(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
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if *rhs != 0 {
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if lhs % rhs == 0 {
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Ok(Value::Int {
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val: lhs / rhs,
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span,
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})
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} else {
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Ok(Value::Float {
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val: (*lhs as f64) / (*rhs as f64),
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span,
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})
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}
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} else {
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Err(ShellError::DivisionByZero(op))
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}
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}
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => {
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if *rhs != 0.0 {
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Ok(Value::Float {
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val: *lhs as f64 / *rhs,
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span,
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})
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} else {
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Err(ShellError::DivisionByZero(op))
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}
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}
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => {
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if *rhs != 0 {
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Ok(Value::Float {
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val: *lhs / *rhs as f64,
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span,
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})
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} else {
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Err(ShellError::DivisionByZero(op))
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}
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}
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => {
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if *rhs != 0.0 {
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Ok(Value::Float {
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val: lhs / rhs,
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span,
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})
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} else {
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Err(ShellError::DivisionByZero(op))
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}
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}
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn lt(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
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val: lhs < rhs,
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span,
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}),
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
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val: (*lhs as f64) < *rhs,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
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val: *lhs < *rhs as f64,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
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val: lhs < rhs,
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span,
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}),
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn lte(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
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let span = span(&[self.span(), rhs.span()]);
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match (self, rhs) {
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(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
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val: lhs <= rhs,
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span,
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}),
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(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
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val: (*lhs as f64) <= *rhs,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
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val: *lhs <= *rhs as f64,
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span,
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}),
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(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
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val: lhs <= rhs,
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span,
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}),
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_ => Err(ShellError::OperatorMismatch {
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op_span: op,
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lhs_ty: self.get_type(),
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lhs_span: self.span(),
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rhs_ty: rhs.get_type(),
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rhs_span: rhs.span(),
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}),
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}
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}
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pub fn gt(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
|
|
let span = span(&[self.span(), rhs.span()]);
|
|
|
|
match (self, rhs) {
|
|
(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs > rhs,
|
|
span,
|
|
}),
|
|
(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: (*lhs as f64) > *rhs,
|
|
span,
|
|
}),
|
|
(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: *lhs > *rhs as f64,
|
|
span,
|
|
}),
|
|
(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs > rhs,
|
|
span,
|
|
}),
|
|
_ => Err(ShellError::OperatorMismatch {
|
|
op_span: op,
|
|
lhs_ty: self.get_type(),
|
|
lhs_span: self.span(),
|
|
rhs_ty: rhs.get_type(),
|
|
rhs_span: rhs.span(),
|
|
}),
|
|
}
|
|
}
|
|
pub fn gte(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
|
|
let span = span(&[self.span(), rhs.span()]);
|
|
|
|
match (self, rhs) {
|
|
(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs >= rhs,
|
|
span,
|
|
}),
|
|
(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: (*lhs as f64) >= *rhs,
|
|
span,
|
|
}),
|
|
(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: *lhs >= *rhs as f64,
|
|
span,
|
|
}),
|
|
(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs >= rhs,
|
|
span,
|
|
}),
|
|
_ => Err(ShellError::OperatorMismatch {
|
|
op_span: op,
|
|
lhs_ty: self.get_type(),
|
|
lhs_span: self.span(),
|
|
rhs_ty: rhs.get_type(),
|
|
rhs_span: rhs.span(),
|
|
}),
|
|
}
|
|
}
|
|
pub fn eq(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
|
|
let span = span(&[self.span(), rhs.span()]);
|
|
|
|
match (self, rhs) {
|
|
(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs == rhs,
|
|
span,
|
|
}),
|
|
(Value::String { val: lhs, .. }, Value::String { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs == rhs,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: (*lhs as f64) == *rhs,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: *lhs == *rhs as f64,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs == rhs,
|
|
span,
|
|
}),
|
|
(Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs == rhs,
|
|
span,
|
|
}),
|
|
(
|
|
Value::Record {
|
|
vals: lhs,
|
|
cols: lhs_headers,
|
|
..
|
|
},
|
|
Value::Record {
|
|
vals: rhs,
|
|
cols: rhs_headers,
|
|
..
|
|
},
|
|
) => Ok(Value::Bool {
|
|
val: lhs_headers == rhs_headers && lhs == rhs,
|
|
span,
|
|
}),
|
|
_ => Err(ShellError::OperatorMismatch {
|
|
op_span: op,
|
|
lhs_ty: self.get_type(),
|
|
lhs_span: self.span(),
|
|
rhs_ty: rhs.get_type(),
|
|
rhs_span: rhs.span(),
|
|
}),
|
|
}
|
|
}
|
|
pub fn ne(&self, op: Span, rhs: &Value) -> Result<Value, ShellError> {
|
|
let span = span(&[self.span(), rhs.span()]);
|
|
|
|
match (self, rhs) {
|
|
(Value::Int { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs != rhs,
|
|
span,
|
|
}),
|
|
(Value::String { val: lhs, .. }, Value::String { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs != rhs,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Int { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: (*lhs as f64) != *rhs,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Float { val: lhs, .. }, Value::Int { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: *lhs != *rhs as f64,
|
|
span,
|
|
}),
|
|
// FIXME: these should consider machine epsilon
|
|
(Value::Float { val: lhs, .. }, Value::Float { val: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs != rhs,
|
|
span,
|
|
}),
|
|
(Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
|
|
val: lhs != rhs,
|
|
span,
|
|
}),
|
|
(
|
|
Value::Record {
|
|
vals: lhs,
|
|
cols: lhs_headers,
|
|
..
|
|
},
|
|
Value::Record {
|
|
vals: rhs,
|
|
cols: rhs_headers,
|
|
..
|
|
},
|
|
) => Ok(Value::Bool {
|
|
val: lhs_headers != rhs_headers || lhs != rhs,
|
|
span,
|
|
}),
|
|
|
|
_ => Err(ShellError::OperatorMismatch {
|
|
op_span: op,
|
|
lhs_ty: self.get_type(),
|
|
lhs_span: self.span(),
|
|
rhs_ty: rhs.get_type(),
|
|
rhs_span: rhs.span(),
|
|
}),
|
|
}
|
|
}
|
|
}
|