forked from extern/nushell
e445c41454
Fixes #8341. The `CustomValue::to_json()` function is an odd duck; it defaults to returning `null`, and no `CustomValue` implementations override it to do anything useful. I forgot to implement `to_json()` for `SQLiteDatabase`, so `open foo.db | to json` was returning `null`. To fix this, I've removed `CustomValue::to_json()` and now `to json` will collect a `CustomValue` into a regular `Value` before doing a JSON conversion.
56 lines
1.7 KiB
Rust
56 lines
1.7 KiB
Rust
use std::{cmp::Ordering, fmt};
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use crate::{ast::Operator, ShellError, Span, Value};
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// Trait definition for a custom value
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#[typetag::serde(tag = "type")]
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pub trait CustomValue: fmt::Debug + Send + Sync {
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fn clone_value(&self, span: Span) -> Value;
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//fn category(&self) -> Category;
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// Define string representation of the custom value
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fn value_string(&self) -> String;
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// Converts the custom value to a base nushell value
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// This is used to represent the custom value using the table representations
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// That already exist in nushell
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fn to_base_value(&self, span: Span) -> Result<Value, ShellError>;
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// Any representation used to downcast object to its original type
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fn as_any(&self) -> &dyn std::any::Any;
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// Follow cell path functions
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fn follow_path_int(&self, _count: usize, span: Span) -> Result<Value, ShellError> {
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Err(ShellError::IncompatiblePathAccess {
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type_name: self.value_string(),
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span,
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})
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}
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fn follow_path_string(&self, _column_name: String, span: Span) -> Result<Value, ShellError> {
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Err(ShellError::IncompatiblePathAccess {
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type_name: self.value_string(),
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span,
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})
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}
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// ordering with other value
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fn partial_cmp(&self, _other: &Value) -> Option<Ordering> {
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None
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}
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// Definition of an operation between the object that implements the trait
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// and another Value.
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// The Operator enum is used to indicate the expected operation
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fn operation(
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&self,
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_lhs_span: Span,
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operator: Operator,
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op: Span,
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_right: &Value,
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) -> Result<Value, ShellError> {
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Err(ShellError::UnsupportedOperator { operator, span: op })
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}
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}
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