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use std::fmt;
use crate::{Iso8211Error, Result};
#[derive(Debug, Clone, Copy)]
pub enum Format {
CharacterData(Option<usize>),
UnsignedInteger(usize),
SignedInteger(usize),
SignedFloatingPoint,
//SubFormat(Box<Format>),
}
impl Format {
pub(super) fn read(value: &str) -> Result<Vec<Format>> {
if value.is_empty() {
return Err(Iso8211Error::Parse("empty format string".to_string()));
}
let formats: Vec<Format>;
let mut multiplicity = 0;
let mut chars = value.chars();
loop {
match chars.next() {
Some('b') => {
if multiplicity == 0 {
multiplicity = 1;
}
break;
}
Some('A') => {
if multiplicity == 0 {
multiplicity = 1;
}
break;
}
Some(c) => {
if c.is_numeric() {
multiplicity = multiplicity * 10 + c.to_digit(10).unwrap() as usize;
} else {
return Err(Iso8211Error::Parse(format!(
"invalid format multiplicity: '{}'",
value
)));
}
}
None => return Err(Iso8211Error::Parse("empty format string".to_string())),
}
}
let mut chars = value.chars();
if multiplicity > 1 {
let mstr = multiplicity.to_string();
let mut len = mstr.chars();
while len.next().is_some() {
chars.next();
}
}
match chars.next() {
Some('b') => match chars.next() {
Some('1') => match chars.next() {
Some('1') => formats = vec![Format::UnsignedInteger(1); multiplicity],
Some('2') => formats = vec![Format::UnsignedInteger(2); multiplicity],
Some('4') => formats = vec![Format::UnsignedInteger(4); multiplicity],
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid unsigned integer size: '{}'",
value
)))
}
None => {
return Err(Iso8211Error::Parse(format!(
"missing unsigned integer size: '{}'",
value
)))
}
},
Some('2') => match chars.next() {
Some('1') => formats = vec![Format::SignedInteger(1); multiplicity],
Some('2') => formats = vec![Format::SignedInteger(2); multiplicity],
Some('4') => formats = vec![Format::SignedInteger(4); multiplicity],
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid signed integer size: '{}'",
value
)))
}
None => {
return Err(Iso8211Error::Parse(format!(
"missing signed integer size: '{}'",
value
)))
}
},
Some('4') => match chars.next() {
Some('8') => formats = vec![Format::SignedFloatingPoint; multiplicity],
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid signed floating point size: '{}'",
value
)))
}
None => {
return Err(Iso8211Error::Parse(format!(
"missing signed floating point size: '{}'",
value
)))
}
},
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid signed floating point size: '{}'",
value
)))
}
None => {
return Err(Iso8211Error::Parse(format!(
"missing signed floating point size: '{}'",
value
)))
}
},
Some('A') => match chars.next() {
Some('(') => {
let mut size: usize = 0;
loop {
match chars.next() {
Some(')') => break,
Some(c) => {
if c.is_numeric() {
size = size * 10 + c.to_digit(10).unwrap() as usize;
} else {
return Err(Iso8211Error::Parse(format!(
"invalid digit in signed floating point size: '{}'",
value
)));
}
}
None => {
return Err(Iso8211Error::Parse(format!(
"invalid signed floating point size: '{}'",
value
)))
}
}
}
formats = vec![Format::CharacterData(Some(size)); multiplicity]
}
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid character string format: '{}'",
value
)))
}
None => formats = vec![Format::CharacterData(None); multiplicity],
},
Some(_) => {
return Err(Iso8211Error::Parse(format!(
"invalid data type in format: '{}'",
value
)))
}
None => {
return Err(Iso8211Error::Parse(format!(
"format missing data type: '{}'",
value
)))
}
}
if chars.next().is_some() {
return Err(Iso8211Error::Parse(format!(
"found an unexpected character after the format size: {}",
value
)));
}
Ok(formats)
}
}
impl fmt::Display for Format {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Format::CharacterData(o) => match o {
None => write!(f, "CharacterData()"),
Some(s) => write!(f, "CharacterData({})", s),
},
Format::UnsignedInteger(s) => write!(f, "UnsignedInteger({})", s),
Format::SignedInteger(s) => write!(f, "SignedInteger({})", s),
Format::SignedFloatingPoint => write!(f, "SignedFloatingPoint"),
}
}
}