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parse_strength_directive

libmagic_rs::parser::grammar

Function parse_strength_directive 

Source 
pub fn parse_strength_directive(input: &str) -> IResult<&str, StrengthModifier>
Expand description

Parse a strength directive (!:strength line)

Parses the !:strength directive that modifies rule strength. Format: !:strength [+|-|*|/|=]N or !:strength N

§Examples

use libmagic_rs::parser::grammar::parse_strength_directive;
use libmagic_rs::parser::ast::StrengthModifier;

assert_eq!(parse_strength_directive("!:strength +10"), Ok(("", StrengthModifier::Add(10))));
assert_eq!(parse_strength_directive("!:strength -5"), Ok(("", StrengthModifier::Subtract(5))));
assert_eq!(parse_strength_directive("!:strength *2"), Ok(("", StrengthModifier::Multiply(2))));
assert_eq!(parse_strength_directive("!:strength /2"), Ok(("", StrengthModifier::Divide(2))));
assert_eq!(parse_strength_directive("!:strength =50"), Ok(("", StrengthModifier::Set(50))));
assert_eq!(parse_strength_directive("!:strength 50"), Ok(("", StrengthModifier::Set(50))));

§Errors

Returns a nom parsing error if:

  • Input doesn’t start with !:strength
  • The modifier value cannot be parsed as a valid integer
  • The operator is invalid