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
|
use crate::*;
pub struct Table {
/// A [Line] is the content of a cell, a group of cells forms a table row,
/// a group of rows forms a separated section of the table, and a group of
/// sections forms the table itself.
/// Each row in the table has the same number of columns as the table header.
pub sections: Vec<Vec<Vec<Line>>>,
pub columns: Vec<Column>,
}
impl Table {
pub fn from_strs(lines: &[&str]) -> Option<Self> {
let mut lines = lines.into_iter();
let columns: Vec<Column> = {
let names = split_cells(lines.next()?)?;
let alignments = parse_alignments(lines.next()?)?;
if names.len() != alignments.len() { return None }
let make_column = |(n, (a, b))| Column { name: n, alignment: a, border_right: b };
std::iter::zip(names, alignments).map(make_column).collect()
};
let mut sections = Vec::new();
let mut rows = Vec::new();
for line in lines {
if let Some(alignments) = parse_alignments(line) {
if alignments.len() != columns.len() { return None }
sections.push(std::mem::take(&mut rows))
} else {
let row: Vec<Line> = split_cells(line)?;
if row.len() != columns.len() { return None }
rows.push(row);
}
}
if !rows.is_empty() {
sections.push(std::mem::take(&mut rows));
}
return Some( Self { columns, sections } );
}
}
pub struct Column {
pub name: Line,
pub alignment: Alignment,
pub border_right: bool,
}
pub enum Alignment {
Left,
Center,
Right,
}
impl Alignment {
pub fn from_str(cell: &str) -> Option<Self> {
if !cell.chars().all(|c| c == ':' || c == '-') {
return None }
match (cell.starts_with(':'), cell.ends_with(':')) {
(false, false) => Some(Alignment::Left),
(false, true ) => Some(Alignment::Right),
(true, false) => Some(Alignment::Left),
(true, true ) => Some(Alignment::Center),
}
}
}
/// Returns the contents of each cell in the row, and whether the right edge
/// is a vertical border.
fn split_columns(line: &str) -> Option<Vec<(&str, bool)>> {
if let Some(("", tail)) = line.split_once('|') {
if let Some((head, "")) = tail.rsplit_once('|') {
let mut output: Vec<(&str, bool)> = Vec::new();
for cell in head.split('|') {
if cell.is_empty () {
if let Some(last) = output.last_mut() {
last.1 = true;
}
} else {
output.push((cell.trim(), false));
}
}
return Some(output);
}
}
return None;
}
fn split_cells(line: &str) -> Option<Vec<Line>> {
Some(split_columns(line)?.into_iter().map(|(cell, _)| Line::from_str(cell)).collect())
}
fn parse_alignments(line: &str) -> Option<Vec<(Alignment, bool)>> {
let mut alignments = Vec::new();
for (cell, border_right) in split_columns(line)? {
alignments.push((Alignment::from_str(cell)?, border_right));
}
Some(alignments)
}
|
