1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
use std::iter::Peekable;
use crate::{
build::{self, Builder, Target},
text::{Character, Eol},
};
use super::Error;
pub struct Reader<'a> {
iter: Peekable<&'a mut dyn Iterator<Item = u8>>,
pub row: usize,
pub column: usize,
}
impl<'a> Reader<'a> {
pub fn new(iter: &'a mut dyn Iterator<Item = u8>) -> Self {
Self {
iter: iter.peekable(),
row: 0,
column: 0,
}
}
pub fn read_line<P, B: Builder<Product = P>>(
&mut self,
target: Target<P, B>,
) -> Result<P, Error> {
let product = self.read(target)?;
self.next_line()?;
Ok(product)
}
pub fn read<P, B: Builder<Product = P>>(
&mut self,
mut target: Target<P, B>,
) -> Result<P, Error> {
loop {
target = match target {
Target::Builder(builder) => match self.iter.peek() {
Some(byte) => match Character::from_byte(*byte) {
Character::Eol(_) => match builder.done() {
Some(product) => break Ok(product),
None => break Err(Error::Eol(self.row)),
},
Character::Printable(printable) => {
match builder.push(printable) {
Ok(next) => {
self.column += 1;
self.iter.next();
next
}
Err(build::Error::Character(allowed)) => {
break Err(Error::Character(
self.row,
self.column,
allowed,
))
}
}
}
Character::Unprintable(byte) => {
break Err(Error::Unprintable(
self.row,
self.column,
byte,
))
}
},
None => match builder.done() {
Some(product) => break Ok(product),
None => break Err(Error::Eof(self.row)),
},
},
Target::Product(product) => break Ok(product),
}
}
}
pub fn next_line(&mut self) -> Result<(), Error> {
let next = match self.iter.peek() {
Some(byte) => Character::from_byte(*byte),
None => return Err(Error::Eof(self.row)),
};
match next {
Character::Eol(eol) => match eol {
Eol::Cr => {
self.iter.next();
if let Some(byte) = self.iter.peek() {
if Character::from_byte(*byte).is_lf() {
self.iter.next();
}
}
}
Eol::Lf => {
self.iter.next();
if let Some(byte) = self.iter.peek() {
if Character::from_byte(*byte).is_cr() {
self.iter.next();
}
}
}
Eol::Rs => {
self.iter.next();
}
},
Character::Printable(_) => {
return Err(Error::Overflow(self.row, self.column))
}
Character::Unprintable(byte) => {
return Err(Error::Unprintable(self.row, self.column, byte))
}
}
self.row += 1;
self.column = 0;
Ok(())
}
pub fn has_blank(&mut self) -> bool {
match self.iter.peek() {
Some(byte) => match Character::from_byte(*byte) {
Character::Eol(_) => true,
_ => false,
},
None => false,
}
}
}