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use comrak::{
arena_tree::NodeEdge,
nodes::{AstNode, NodeValue},
parse_document, Arena, ComrakOptions,
};
// `node.traverse()`` creates an itertor that will traverse
// the current node and all descendants in order.
// The iterator yields `NodeEdges`. `NodeEdges` can have the
// following values:
//
// `NodeEdge::Start(node)` Start of node.
// `NodeEdge::End(node)` End of node.
// `None` End of iterator at bottom of last branch.
//
// This example extracts plain text ignoring nested
// markup.
// Note: root can be any AstNode, not just document root.
fn extract_text_traverse<'a>(root: &'a AstNode<'a>) -> String {
let mut output_text = String::new();
// Use `traverse` to get an iterator of `NodeEdge` and process each.
for edge in root.traverse() {
if let NodeEdge::Start(node) = edge {
// Handle the Start edge to process the node's value.
if let NodeValue::Text(ref text) = node.data.borrow().value {
// If the node is a text node, append its text to `output_text`.
output_text.push_str(text);
}
}
}
output_text
}
fn main() {
let markdown_input = "Hello, *worl[d](https://example.com/)*";
// Nested inline markup. Equivalent html should look like this:
//"<p>Hello, <em>worl<a href="https://example.com">d</a></em></p>
println!("INPUT: {}", markdown_input);
// setup parser
let arena = Arena::new();
let options = ComrakOptions::default();
// parse document and return root.
let root = parse_document(&arena, markdown_input, &options);
// extract text and print
println!("OUTPUT: {}", extract_text_traverse(root).as_str())
}
#[cfg(test)]
mod tests {
// Import everything from the outer module to make it available for tests
use super::*;
#[test]
fn extract_text_traverse_test() {
let markdown_input = "Hello, *worl[d](https://example.com/)*";
let arena = Arena::new();
let options = ComrakOptions::default();
let root = parse_document(&arena, markdown_input, &options);
assert_eq!("Hello, world", extract_text_traverse(root));
}
}
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