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use super::{walk, clean_markdown};
use super::TagHandler;
use super::StructuredPrinter;
use std::{collections::HashMap, cmp};
use markup5ever_rcdom::{Handle,NodeData};
#[derive(Default)]
pub struct TableHandler;
impl TagHandler for TableHandler {
fn handle(&mut self, tag: &Handle, printer: &mut StructuredPrinter) {
let mut table_markup = String::new();
let any_matcher = |cell: &Handle| { let name = tag_name(cell); name == "td" || name == "th" };
let column_count : usize;
let mut column_widths : Vec<usize>;
let rows = find_children(tag, "tr");
{
let most_big_row = rows.iter().max_by(|left, right| collect_children(&left, any_matcher).len().cmp(&collect_children(&right, any_matcher).len()));
if most_big_row.is_none() {
return;
}
column_count = collect_children(&most_big_row.unwrap(), any_matcher).len();
column_widths = vec![3; column_count];
for row in &rows {
let cells = collect_children(row, any_matcher);
for index in 0..column_count {
if let Some(cell) = cells.get(index) {
let text = to_text(cell);
column_widths[index] = cmp::max(column_widths[index], text.chars().count());
}
}
}
}
for (idx, row) in rows.iter().enumerate() {
table_markup.push('|');
let cells = collect_children(row, any_matcher);
for index in 0..column_count { let padded_cell_text = pad_cell_text(&cells.get(index), column_widths[index]);
table_markup.push_str(&padded_cell_text);
table_markup.push('|');
}
table_markup.push('\n');
if idx == 0 {
table_markup.push('|');
for index in 0..column_count {
let width = column_widths[index];
if width < 3 {
table_markup.push_str(&"-".repeat(width));
table_markup.push('|');
continue;
}
let mut alignment = String::new();
if let Some(header_cell) = cells.get(index) {
alignment = match header_cell.data {
NodeData::Element { ref attrs, .. } => {
let attrs = attrs.borrow();
let align_attr = attrs.iter().find(|attr| attr.name.local.to_string() == "align");
align_attr.map(|attr| attr.value.to_string()).unwrap_or_default()
}
_ => String::new()
};
}
match alignment.as_ref() {
"left" => { table_markup.push(':'); table_markup.push_str(&"-".repeat(width - 1)); }
"center" => { table_markup.push(':'); table_markup.push_str(&"-".repeat(width - 2)); table_markup.push(':'); }
"right" => { table_markup.push_str(&"-".repeat(width - 1)); table_markup.push(':'); }
_ => table_markup.push_str(&"-".repeat(width))
}
table_markup.push('|');
}
table_markup.push('\n');
}
}
printer.insert_newline();
printer.insert_newline();
printer.append_str(&table_markup);
}
fn after_handle(&mut self, _printer: &mut StructuredPrinter) {
}
fn skip_descendants(&self) -> bool {
return true;
}
}
fn pad_cell_text(tag: &Option<&Handle>, column_width: usize) -> String {
let mut result = String::new();
if let Some(cell) = tag {
let text = to_text(cell);
let len_diff = column_width - text.chars().count();
if len_diff > 0 {
if len_diff > 1 {
let pad_len = len_diff / 2;
let remainder = len_diff % 2;
result.push_str(&" ".repeat(pad_len));
result.push_str(&text);
result.push_str(&" ".repeat(pad_len + remainder));
} else {
result.push_str(&text);
result.push(' ');
}
} else {
result.push_str(&text);
}
} else {
let pad_len = column_width;
result.push_str(&" ".repeat(pad_len));
}
return result;
}
fn tag_name(tag: &Handle) -> String {
return match tag.data {
NodeData::Element { ref name, .. } => name.local.to_string(),
_ => String::new()
}
}
fn find_children(tag: &Handle, name: &str) -> Vec<Handle> {
let mut result: Vec<Handle> = vec![];
let children = tag.children.borrow();
for child in children.iter() {
if tag_name(&child) == name {
result.push(child.clone());
}
let mut descendants = find_children(&child, name);
result.append(&mut descendants);
}
return result;
}
fn collect_children<P>(tag: &Handle, predicate: P) -> Vec<Handle>
where P: Fn(&Handle) -> bool {
let mut result: Vec<Handle> = vec![];
let children = tag.children.borrow();
for child in children.iter() {
let candidate = child.clone();
if predicate(&candidate) {
result.push(candidate);
}
}
return result;
}
fn to_text(tag: &Handle) -> String {
let mut printer = StructuredPrinter::default();
walk(tag, &mut printer, &HashMap::default());
let result = clean_markdown(&printer.data);
return result.replace("\n", "<br/>");
}