//! XML formatting utilities.

/// Format XML with proper indentation (Issue #1980).

/// Simple XML pretty-printer that adds indentation to make XML readable.

pub fn format_xml(xml: &str) -> String {

let mut result = String::new();

let mut indent_level: usize = 0;

let mut in_tag = false;

let mut current_tag = String::new();

let mut is_closing_tag;

let mut is_self_closing;

let mut text_content = String::new();

for c in xml.chars() {

match c {

'<' => {

// Output any accumulated text content

let trimmed = text_content.trim();

if !trimmed.is_empty() {

result.push_str(trimmed);

}

text_content.clear();

in_tag = true;

current_tag.clear();

}

'>' => {

if in_tag {

// Check if this is a closing tag

is_closing_tag = current_tag.starts_with('/');

// Check if self-closing

is_self_closing = current_tag.ends_with('/');

// For closing tags, decrease indent first

if is_closing_tag && indent_level > 0 {

indent_level -= 1;

}

// Add newline and indent before tag (except for first tag)

if !result.is_empty() {

result.push('\n');

result.push_str(&" ".repeat(indent_level));

}

// Output the tag

result.push('<');

result.push_str(&current_tag);

result.push('>');

// For opening tags (not self-closing), increase indent

if !is_closing_tag

&& !is_self_closing

&& !current_tag.starts_with('?')

&& !current_tag.starts_with('!')

{

indent_level += 1;

}

in_tag = false;

current_tag.clear();

}

}

_ => {

if in_tag {

current_tag.push(c);

} else {

text_content.push(c);

}

}

}

}

// Handle any remaining text

let trimmed = text_content.trim();

if !trimmed.is_empty() {

result.push_str(trimmed);

}

result

}