Struct Parser

pub struct Parser<'a> { /* private fields */ }

Parser is used to parse an expression and return an AuthorizationExpression-based tree.

Implementations

impl<'a> Parser<'a>

pub fn new(lexer: Lexer<'a>) -> Self

Creates a new Parser instance.

Arguments

• lexer - The Lexer instance to use for tokenization.

pub fn parse(&mut self) -> Result<AuthorizationExpression, ParserError>

Parse the input string and return an AuthorizationExpression. If the input string is invalid, a ParserError is returned.

Example

 use std::collections::HashSet;
 use accumulo_access::{Lexer, Parser};
 let input = "label1&label5&(label3|label8|\"label 🕺\")";
 let lexer: Lexer<'_> = Lexer::new(input);
 let mut parser = Parser::new(lexer);
 let ast = parser.parse().unwrap();
 let authorized_tokens : &HashSet<String> = &[
   String::from("label1"),
   String::from("label5"),
   String::from("label 🕺"),
 ].iter().cloned().collect();
 assert_eq!(ast.evaluate(&authorized_tokens), true);