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pub struct PreTable { header: Vec<String>, body: Vec<Vec<String>>, max: Vec<usize>, show_header: bool, is_body_split: bool, line_char: char, vertical_char: char, corner_char: char, } impl PreTable { pub fn new() -> Self { Self { header: Vec::new(), body: Vec::new(), max: Vec::new(), show_header: true, is_body_split: false, line_char: '-', vertical_char: '|', corner_char: '+', } } pub fn add_header(&mut self, v: &str) { self.header.push(v.to_string()); let n = v.len(); self.max.push(n); } pub fn set_header(&mut self, v: Vec<&str>) { self.header = Vec::new(); self.max = Vec::new(); for value in v { self.add_header(value); } } pub fn add_body(&mut self, v: Vec<&str>) { self.body.push(v.iter().map(|s| s.to_string()).collect()); while self.max.len() < v.len() { self.max.push(0); } for n in 0..v.len() { let l = v[n].len(); let m = self.max[n]; if m < l { self.max[n] = l; } } } fn line(&self) -> String { let mut line = self.corner_char.to_string(); let lc = &self.line_char.to_string(); for n in 0..self.header.len() { let c = self.max[n]; line += &format!("{}{}", Self::repeat(lc, c + 2), self.corner_char); } line } fn header(&self) -> String { let mut s = self.vertical_char.to_string(); for n in 0..self.header.len() { let ref h = self.header[n]; let ref m = self.max[n]; s += &format!("{}{}", Self::format_center(h, m + 2), self.vertical_char); } s } fn body(&self) -> Vec<String> { self.body .iter() .map(|v| { let mut s = self.vertical_char.to_string(); let mut max_iter = self.max.iter(); for n in 0..self.header.len() { let m = max_iter.next().unwrap(); let value = v.get(n); s += &format!( "{}{}", Self::format_center( match value { Some(v) => v, None => "", }, m + 2 ), self.vertical_char ); } s }) .collect() } pub fn output(self) -> String { let mut s = format!("{}\n", self.line()); if self.show_header && !self.header.is_empty() { s += &format!("{}\n", self.header()); s += &format!("{}\n", self.line()); } if !self.body.is_empty() { let body = self.body(); if self.is_body_split { for b in body { s += &format!("{}\n", b); s += &format!("{}\n", self.line()); } } else { s += &format!("{}\n", body.join("\n")); s += &format!("{}\n", self.line()); } } s } pub fn show_header(&mut self, b: bool) { self.show_header = b; } pub fn is_body_split(&mut self, b: bool) { self.is_body_split = b; } pub fn set_line_char(&mut self, c: char) { self.line_char = c; } pub fn set_vertical_char(&mut self, c: char) { self.vertical_char = c; } pub fn set_corner_char(&mut self, c: char) { self.corner_char = c; } fn format_center(v: &str, count: usize) -> String { let start = (count - v.len()) / 2; let end = count - v.len() - start; Self::repeat(" ", start) + v + &Self::repeat(" ", end) } fn repeat(s: &str, count: usize) -> String { let mut v = String::new(); for _ in 0..count { v += s; } v } }