Struct dynparser::parser::expression::SetOfRules

pub struct SetOfRules(_);

The set of rules to be parsed Any rule has a name A rule can be registered just once The starting rule is main

Implementations

impl SetOfRules

pub fn new(mrules: HashMap<String, Expression>) -> Self

Initialize a set of rules with a hashmap of <String, Expression> In general, is better to use the rules! macro

pub fn add(self, name: &str, expr: Expression) -> Self

As this is a dynamic parser, it is necessary to add rules on runtime.

This method, will take the owner ship, and will return itself

In this way, you don’t need to declare mutable vars. You could need recursion in some cases

To add several rules at once, look for merge

#[macro_use]  extern crate dynparser;
use dynparser::parse;

fn main() {
    let rules = rules!{
       "main"   =>  and!{
                        rep!(lit!("a"), 1, 5),
                        ref_rule!("rule2")
                    }
    };

    let rules = rules.add("rule2", lit!("bcd"));

    assert!(parse("aabcd", &rules).is_ok())
}

pub fn merge(self, rules2merge: Self) -> Self

As this is a dynamic parser, it is necessary to add rules on runtime.

This method, will take the owner ship, and will return itself

In this way, you don’t need to declare mutable vars. You could need recursion in some cases

It will add the rules from the parameter

#[macro_use]  extern crate dynparser;
use dynparser::parse;

fn main() {
    let rules = rules!{
       "main"   =>  and!{
                        rep!(lit!("a"), 1, 5),
                        ref_rule!("rule2")
                    }
    };

    let rules = rules.merge(rules!{"rule2" => lit!("bcd")});

    assert!(parse("aabcd", &rules).is_ok())
}

Trait Implementations

impl Debug for SetOfRules

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.