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auto.rs
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auto.rs
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//! A module to convert file extension to reader
use crate::errors::Error;
use crate::vba::VbaProject;
use crate::{
open_workbook, open_workbook_from_rs, DataType, Metadata, Ods, Range, Reader, Xls, Xlsb, Xlsx,
};
use std::borrow::Cow;
use std::fs::File;
use std::io::BufReader;
use std::path::Path;
/// A wrapper over all sheets when the file type is not known at static time
pub enum Sheets<RS> {
/// Xls reader
Xls(Xls<RS>),
/// Xlsx reader
Xlsx(Xlsx<RS>),
/// Xlsb reader
Xlsb(Xlsb<RS>),
/// Ods reader
Ods(Ods<RS>),
}
/// Opens a workbook and define the file type at runtime.
///
/// Whenever possible use the statically known `open_workbook` function instead
pub fn open_workbook_auto<P>(path: P) -> Result<Sheets<BufReader<File>>, Error>
where
P: AsRef<Path>,
{
let path = path.as_ref();
Ok(match path.extension().and_then(|e| e.to_str()) {
Some("xls") | Some("xla") => Sheets::Xls(open_workbook(&path).map_err(Error::Xls)?),
Some("xlsx") | Some("xlsm") | Some("xlam") => {
Sheets::Xlsx(open_workbook(&path).map_err(Error::Xlsx)?)
}
Some("xlsb") => Sheets::Xlsb(open_workbook(&path).map_err(Error::Xlsb)?),
Some("ods") => Sheets::Ods(open_workbook(&path).map_err(Error::Ods)?),
_ => {
if let Ok(ret) = open_workbook::<Xls<_>, _>(path) {
return Ok(Sheets::Xls(ret));
} else if let Ok(ret) = open_workbook::<Xlsx<_>, _>(path) {
return Ok(Sheets::Xlsx(ret));
} else if let Ok(ret) = open_workbook::<Xlsb<_>, _>(path) {
return Ok(Sheets::Xlsb(ret));
} else if let Ok(ret) = open_workbook::<Ods<_>, _>(path) {
return Ok(Sheets::Ods(ret));
} else {
return Err(Error::Msg("Cannot detect file format"));
};
}
})
}
/// Opens a workbook from the given bytes.
///
/// Whenever possible use the statically known `open_workbook_from_bytes` function instead
pub fn open_workbook_auto_from_rs<RS>(data: RS) -> Result<Sheets<RS>, Error>
where
RS: std::io::Read + std::io::Seek + Clone,
{
if let Ok(ret) = open_workbook_from_rs::<Xls<RS>, RS>(data.clone()) {
return Ok(Sheets::Xls(ret));
} else if let Ok(ret) = open_workbook_from_rs::<Xlsx<RS>, RS>(data.clone()) {
return Ok(Sheets::Xlsx(ret));
} else if let Ok(ret) = open_workbook_from_rs::<Xlsb<RS>, RS>(data.clone()) {
return Ok(Sheets::Xlsb(ret));
} else if let Ok(ret) = open_workbook_from_rs::<Ods<RS>, RS>(data.clone()) {
return Ok(Sheets::Ods(ret));
} else {
return Err(Error::Msg("Cannot detect file format"));
};
}
impl<RS> Reader<RS> for Sheets<RS>
where
RS: std::io::Read + std::io::Seek,
{
type Error = Error;
/// Creates a new instance.
fn new(_reader: RS) -> Result<Self, Self::Error> {
Err(Error::Msg("Sheets must be created from a Path"))
}
/// Gets `VbaProject`
fn vba_project(&mut self) -> Option<Result<Cow<'_, VbaProject>, Self::Error>> {
match *self {
Sheets::Xls(ref mut e) => e.vba_project().map(|vba| vba.map_err(Error::Xls)),
Sheets::Xlsx(ref mut e) => e.vba_project().map(|vba| vba.map_err(Error::Xlsx)),
Sheets::Xlsb(ref mut e) => e.vba_project().map(|vba| vba.map_err(Error::Xlsb)),
Sheets::Ods(ref mut e) => e.vba_project().map(|vba| vba.map_err(Error::Ods)),
}
}
/// Initialize
fn metadata(&self) -> &Metadata {
match *self {
Sheets::Xls(ref e) => e.metadata(),
Sheets::Xlsx(ref e) => e.metadata(),
Sheets::Xlsb(ref e) => e.metadata(),
Sheets::Ods(ref e) => e.metadata(),
}
}
/// Read worksheet data in corresponding worksheet path
fn worksheet_range(&mut self, name: &str) -> Option<Result<Range<DataType>, Self::Error>> {
match *self {
Sheets::Xls(ref mut e) => e.worksheet_range(name).map(|r| r.map_err(Error::Xls)),
Sheets::Xlsx(ref mut e) => e.worksheet_range(name).map(|r| r.map_err(Error::Xlsx)),
Sheets::Xlsb(ref mut e) => e.worksheet_range(name).map(|r| r.map_err(Error::Xlsb)),
Sheets::Ods(ref mut e) => e.worksheet_range(name).map(|r| r.map_err(Error::Ods)),
}
}
/// Read worksheet formula in corresponding worksheet path
fn worksheet_formula(&mut self, name: &str) -> Option<Result<Range<String>, Self::Error>> {
match *self {
Sheets::Xls(ref mut e) => e.worksheet_formula(name).map(|r| r.map_err(Error::Xls)),
Sheets::Xlsx(ref mut e) => e.worksheet_formula(name).map(|r| r.map_err(Error::Xlsx)),
Sheets::Xlsb(ref mut e) => e.worksheet_formula(name).map(|r| r.map_err(Error::Xlsb)),
Sheets::Ods(ref mut e) => e.worksheet_formula(name).map(|r| r.map_err(Error::Ods)),
}
}
fn worksheets(&mut self) -> Vec<(String, Range<DataType>)> {
match *self {
Sheets::Xls(ref mut e) => e.worksheets(),
Sheets::Xlsx(ref mut e) => e.worksheets(),
Sheets::Xlsb(ref mut e) => e.worksheets(),
Sheets::Ods(ref mut e) => e.worksheets(),
}
}
}