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#![allow(dead_code)] extern crate yaml_rust; pub use yaml_rust::Yaml; use yaml_rust::YamlLoader; use yaml_rust::scanner::ScanError; fn find_yaml_block(text: &str) -> Option<(usize, usize, usize)> { match text.starts_with("---\n") { true => { let slice_after_marker = &text[4..]; let fm_end = slice_after_marker.find("---\n"); if fm_end.is_none() { return None }; let fm_end = fm_end.unwrap(); Some((4,fm_end+4, fm_end+2*4)) }, false => None } } pub fn parse_and_find_content(text: &str) -> Result<(Option<Yaml>, &str), ScanError> { match find_yaml_block(text) { Some((fm_start, fm_end, content_start)) => { let yaml_str = &text[fm_start..fm_end]; let mut documents = YamlLoader::load_from_str(yaml_str)?; let rest_of_text = &text[content_start..]; Ok((documents.pop(), rest_of_text)) }, None => Ok((None, text)) } } pub fn parse(text: &str) -> Result<Option<Yaml>, ScanError> { let (matter, _) = parse_and_find_content(text)?; Ok(matter) } #[test] fn test_valid() { let test_string = "---\ntitle: Valid Yaml Test\n---\nsomething that's not yaml"; println!("Original String{:?}", test_string); let matter = parse(test_string); println!("Matter: {:?}", matter); assert!(matter.is_ok()); let matter = matter.unwrap(); assert!(matter.is_some()); let matter = matter.unwrap(); assert!(matter.as_hash().is_some()); } #[test] fn test_valid_find_content() { let test_string = "---\ntitle: Valid Yaml Test\n---\nsomething that's not yaml"; println!("Original String{:?}", test_string); let result = parse_and_find_content(test_string); assert!(result.is_ok()); let (matter, stripped_string) = result.unwrap(); println!("Stripped String{:?}", stripped_string); println!("Matter: {:?}", matter); assert!(matter.is_some()); let matter = matter.unwrap(); assert!(matter.as_hash().is_some()); assert!(stripped_string.to_string() == test_string[31..].to_string()); } #[test] fn test_none() { let test_string = "something that's not yaml even if it has\n---\nsome: yaml\n--"; println!("Original String{:?}", test_string); let matter = parse(test_string); println!("Matter: {:?}", matter); assert!(matter.is_ok()); let matter = matter.unwrap(); assert!(matter.is_none()); } #[test] fn test_none_find_content() { let test_string = "something that's not yaml even if it has\n---\nsome: yaml\n--"; println!("Original String{:?}", test_string); let result = parse_and_find_content(test_string); assert!(result.is_ok()); let (matter, stripped_string) = result.unwrap(); println!("Stripped String{:?}", stripped_string); println!("Matter: {:?}", matter); assert!(matter.is_none()); assert!(stripped_string.to_string() == test_string); } #[test] fn test_empty() { let test_string = "---\n---\nsomething that's not yaml"; println!("Original String{:?}", test_string); let matter = parse(test_string); println!("Matter: {:?}", matter); assert!(matter.is_ok()); let matter = matter.unwrap(); assert!(matter.is_none()); } #[test] fn test_empty_find_content() { let test_string = "---\n---\nsomething that's not yaml"; println!("Original String{:?}", test_string); let result = parse_and_find_content(test_string); assert!(result.is_ok()); let (matter, stripped_string) = result.unwrap(); println!("Stripped String{:?}", stripped_string); println!("Matter: {:?}", matter); assert!(matter.is_none()); assert!(stripped_string.to_string() == test_string[8..]); } #[test] fn test_tests() { assert_eq!(2+2, 4); }