49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
use domain::models::{ImportError, ParsedFile};
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use serde_json::Value;
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pub fn parse_json(bytes: &[u8]) -> Result<ParsedFile, ImportError> {
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let value: Value =
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serde_json::from_slice(bytes).map_err(|e| ImportError::Json(e.to_string()))?;
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let arr = value
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.as_array()
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.ok_or_else(|| ImportError::Json("expected a JSON array".into()))?;
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if arr.is_empty() {
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return Err(ImportError::Empty);
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}
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let first = arr[0]
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.as_object()
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.ok_or_else(|| ImportError::Json("array elements must be objects".into()))?;
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let columns: Vec<String> = first.keys().cloned().collect();
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if columns.is_empty() {
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return Err(ImportError::NoHeader);
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}
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let rows: Vec<Vec<String>> = arr
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.iter()
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.enumerate()
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.map(|(idx, item)| {
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let obj = item.as_object().ok_or_else(|| {
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ImportError::Json(format!("element at index {} is not an object", idx))
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})?;
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Ok(columns
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.iter()
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.map(|col| obj.get(col).map(value_to_string).unwrap_or_default())
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.collect())
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})
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.collect::<Result<_, ImportError>>()?;
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Ok(ParsedFile { columns, rows })
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}
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fn value_to_string(v: &Value) -> String {
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match v {
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Value::String(s) => s.clone(),
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Value::Null => String::new(),
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other => other.to_string(),
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}
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}
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