ntriple

一个解析单个 RDF 语句的解析器，格式为 RDF N-Triples。

它用 Rust 编写，并使用 rust-peg 将三元组解析为对象结构。字面量被分解为其 RDF 词汇形式 和语言或数据类型。

该库的目的是以流式处理方式处理三元组，因此它不会构建 RDF 图。如果您正在寻找这样的库，请查看 rust-ntriples 或 rome。

示例

extern crate ntriple;

use ntriple::parser::triple_line;
use ntriple::{Subject, Predicate, Object};

fn main() {
  
  // Here's some input in n-triples format. Unicode escape sequences are resolved
  // so \u30AA becomes オ.
  let input = "_:subject <http://example.org/predicate> \"\\u30AAオブジェクト\".";
  
  // parse the input:
  let parse_result = triple_line(&input);
  
  // The result contains an option, or an error when parsing the input failed.
  match parse_result {
  
    // Ok if the input is a triple, a comment, an empty string or whitespace(s).
    Ok(triple_option) => {
      match triple_option {
        Some(triple) => { // a valid triple is found.
          match triple.subject {
            // In this case we expect a blank node label
            Subject::BNode(subject) => println!("Subject: blank node: {}", subject),
            _ => println!("Weird, a blank node is expected here.")
          };
          match triple.predicate {
            Predicate::IriRef(iri) => println!("Predicate: {}", iri)
          };
          match triple.object {
            Object::Lit(literal) => println!("Object: literal: {} ", literal.data),
            _ => println!("Weird, a literal is expected here.")
          }
        },
        None => { println!("Skipped [{}]", input); }
      };
    },
    // a parse error: the input is no valid triple, comment, empty string or whitespace(s)
    Err(error) => println!("{}\n{}", input, error),
  };
}