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//! dbase is rust library meant to read and write dBase / FoxPro files. //! //! Theses files are nowadays generally only found in association with shapefiles. //! //! # Reading //! //! The [Reader](struct.Reader.html) is the struct that you'll need to use in order //! to read the content of a dBase file. //! //! Once you have access to the records, you will have to `match` against the real //! [FieldValue](enum.FieldValue.html) //! //! ## Examples //! //! ``` //! use dbase::FieldValue; //! # fn main() -> Result<(), dbase::Error> { //! let records = dbase::read("tests/data/line.dbf")?; //! for record in records { //! for (name, value) in record { //! println!("{} -> {:?}", name, value); //! match value { //! FieldValue::Character(Some(string)) => println!("Got string: {}", string), //! FieldValue::Numeric(value) => println!("Got numeric value of {:?}", value), //! _ => {} //! } //! } //!} //! # Ok(()) //! # } //! ``` //! //! You can also create a [Reader](reading/struct.Reader.html) and iterate over the records. //! //! ``` //! # fn main() -> Result<(), dbase::Error> { //! let mut reader = dbase::Reader::from_path("tests/data/line.dbf")?; //! for record_result in reader.iter_records() { //! let record = record_result?; //! for (name, value) in record { //! println!("name: {}, value: {:?}", name, value); //! } //! } //! # Ok(()) //! # } //! ``` //! //! ## Deserialisation //! //! If you know what kind of data to expect from a particular file you can use implement //! the [ReadbableRecord](trait.ReadableRecord.html) trait to "deserialize" the record into //! your custom struct: //! //! ``` //! use std::io::{Read, Seek}; //! struct StationRecord { //! name: String, //! marker_col: String, //! marker_sym: String, //! line: String, //! } //! //! impl dbase::ReadableRecord for StationRecord { //! fn read_using<T>(field_iterator: &mut dbase::FieldIterator<T>) -> Result<Self, dbase::FieldIOError> //! where T: Read + Seek{ //! Ok(Self { //! name: field_iterator.read_next_field_as()?.value, //! marker_col: field_iterator.read_next_field_as()?.value, //! marker_sym: field_iterator.read_next_field_as()?.value, //! line: field_iterator.read_next_field_as()?.value, //! }) //! } //! } //! # fn main() -> Result<(), dbase::Error> { //! let mut reader = dbase::Reader::from_path("tests/data/stations.dbf")?; //! let stations = reader.read_as::<StationRecord>()?; //! //! assert_eq!(stations[0].name, "Van Dorn Street"); //! assert_eq!(stations[0].marker_col, "#0000ff"); //! assert_eq!(stations[0].marker_sym, "rail-metro"); //! assert_eq!(stations[0].line, "blue"); //! # Ok(()) //! # } //! ``` //! //! If you use the `serde` optional feature and serde_derive crate you can have the //! [ReadbableRecord](trait.ReadableRecord.html) impletemented for you //! //! ``` //! # #[cfg(feature = "serde")] //! extern crate serde_derive; //! //! # #[cfg(feature = "serde")] //! # fn main() -> Result<(), dbase::Error>{ //! //! use std::io::{Read, Seek}; //! use serde_derive::Deserialize; //! //! #[derive(Deserialize)] //! struct StationRecord { //! name: String, //! marker_col: String, //! marker_sym: String, //! line: String, //! } //! //! let mut reader = dbase::Reader::from_path("tests/data/stations.dbf")?; //! let stations = reader.read_as::<StationRecord>()?; //! //! assert_eq!(stations[0].name, "Van Dorn Street"); //! assert_eq!(stations[0].marker_col, "#0000ff"); //! assert_eq!(stations[0].marker_sym, "rail-metro"); //! assert_eq!(stations[0].line, "blue"); //! # Ok(()) //! # } //! //! # #[cfg(not(feature = "serde"))] //! # fn main() { //! # } //! ``` //! //! //! # Writing //! //! In order to get a [TableWriter](struct.TableWriter.html) you will need to build it using //! its [TableWriterBuilder](struct.TableWriterBuilder.html) to specify the fields that constitute //! a record. //! //! As for reading, you can *serialize* structs into a dBase file, given that they match the //! declared fields in when building the TableWriterBuilder by implementing the //! [WritableRecord](trait.WritableRecord.html). //! //! ## Examples //! //! ``` //! # fn main() -> Result<(), dbase::Error> { //! let mut reader = dbase::Reader::from_path("tests/data/stations.dbf")?; //! let mut stations = reader.read()?; //! //! let mut writer = dbase::TableWriterBuilder::from_reader(reader) //! .build_with_file_dest("stations.dbf").unwrap(); //! //! stations[0].get_mut("line").and_then(|_old| Some("Red".to_string())); //! writer.write_records(&stations)?; //! # Ok(()) //! # } //! ``` //! //! ``` //! use dbase::{TableWriterBuilder, FieldName, WritableRecord, FieldWriter, FieldIOError}; //! use std::convert::TryFrom; //! use std::io::{Cursor, Write}; //! //! struct User { //! nick_name: String, //! age: f64 //! } //! //! impl WritableRecord for User { //! fn write_using<'a, W: Write>(&self, field_writer: &mut FieldWriter<'a, W>) -> Result<(), FieldIOError> { //! field_writer.write_next_field_value(&self.nick_name)?; //! field_writer.write_next_field_value(&self.age)?; //! Ok(()) //! } //! } //! //! let mut writer = TableWriterBuilder::new() //! .add_character_field(FieldName::try_from("Nick Name").unwrap(), 50) //! .add_numeric_field(FieldName::try_from("Age").unwrap(), 20, 10) //! .build_with_dest(Cursor::new(Vec::<u8>::new())); //! //! //! let records = User{ //! nick_name: "Yoshi".to_string(), //! age: 32.0, //! }; //! //! writer.write_record(&records); //! ``` //! //! If you use the serde optional feature and serde_derive crate you can have the //! [WritableRecord](trait.WritableRecord.html) impletemented for you. //! //! ``` //! # #[cfg(feature = "serde")] //! extern crate serde_derive; //! //! # #[cfg(feature = "serde")] //! use serde_derive::Serialize; //! //! use dbase::{TableWriterBuilder, FieldName, WritableRecord, FieldWriter}; //! use std::convert::TryFrom; //! use std::io::{Cursor, Write}; //! //! # #[cfg(feature = "serde")] //! # fn main () { //! #[derive(Serialize)] //! struct User { //! nick_name: String, //! age: f64 //! } //! //! let writer = TableWriterBuilder::new() //! .add_character_field(FieldName::try_from("Nick Name").unwrap(), 50) //! .add_numeric_field(FieldName::try_from("Age").unwrap(), 20, 10) //! .build_with_dest(Cursor::new(Vec::<u8>::new())); //! //! //! let records = vec![User{ //! nick_name: "Yoshi".to_string(), //! age: 32.0, //! }]; //! //! writer.write_records(&records); //! # } //! # #[cfg(not(feature = "serde"))] //! # fn main() {} //! ``` #![deny(unstable_features)] extern crate byteorder; extern crate chrono; #[cfg(feature = "serde")] extern crate serde; #[cfg(feature = "serde")] mod de; #[cfg(feature = "serde")] mod ser; mod error; mod header; mod reading; mod record; mod writing; pub use crate::error::{Error, ErrorKind, FieldIOError}; pub use crate::reading::{read, FieldIterator, NamedValue, TableInfo, ReadableRecord, Reader, Record, RecordIterator}; pub use crate::record::field::{Date, DateTime, FieldValue, Time}; pub use crate::record::{FieldConversionError, FieldInfo, FieldName}; pub use crate::writing::{FieldWriter, TableWriter, TableWriterBuilder, WritableRecord}; /// macro to define a struct that implements the ReadableRecord and WritableRecord /// /// # Examples /// /// ``` /// # #[macro_use] extern crate dbase; /// # fn main() { /// dbase_record!( /// #[derive(Debug)] /// struct UserRecord { /// first_name: String, /// last_name: String, /// age: f64 /// } /// ); /// # } /// ``` #[macro_export] macro_rules! dbase_record { ( $(#[derive($($derives:meta),*)])? struct $name:ident { $( $field_name:ident: $field_type:ty),+ $(,)? } ) => { $(#[derive($($derives),*)])? struct $name { $($field_name: $field_type),+ } impl dbase::ReadableRecord for $name { fn read_using<T>(field_iterator: &mut dbase::FieldIterator<T>) -> Result<Self, dbase::FieldIOError> where T: std::io::Read + std::io::Seek { Ok(Self { $( $field_name: field_iterator .read_next_field_as::<$field_type>()? .value ),+ }) } } impl dbase::WritableRecord for $name { fn write_using<'a, W: std::io::Write>(&self, field_writer: &mut dbase::FieldWriter<'a, W>) -> Result<(), dbase::FieldIOError> { $( field_writer.write_next_field_value(&self.$field_name)?; )+ Ok(()) } } }; }