console_engine 2.6.1

A simple terminal framework to draw things and manage user input
Documentation 
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use crate::forms::FormValue;

use super::FormConstraint;

/// Validates that data exists and is not empty
pub struct NotBlank {
    message: String,
}

impl NotBlank {
    pub fn new(message: &str) -> Box<Self> {
        Box::new(Self {
            message: String::from(message),
        })
    }
}

impl FormConstraint for NotBlank {
    fn validate(&self, output: &FormValue) -> bool {
        match output {
            FormValue::Nothing => false,
            FormValue::Boolean(_) => true,
            FormValue::Index(_) => true,
            FormValue::String(value) => !value.is_empty(),
            FormValue::Map(entries) => !entries.is_empty(),
            FormValue::List(entries) => !entries.is_empty(),
            FormValue::Vec(entries) => !entries.is_empty(),
        }
    }

    fn get_message(&self) -> &str {
        &self.message
    }
}

/// Validates that data evaluates to true
pub struct IsTrue {
    message: String,
}

impl IsTrue {
    pub fn new(message: &str) -> Box<Self> {
        Box::new(Self {
            message: String::from(message),
        })
    }
}

impl FormConstraint for IsTrue {
    fn validate(&self, output: &FormValue) -> bool {
        match output {
            FormValue::Nothing => false,
            FormValue::Boolean(value) => *value,
            FormValue::Index(value) => *value != 0,
            // looking for "true" or "false"
            FormValue::String(value) => value.parse::<bool>().unwrap_or(false),
            FormValue::Map(entries) => entries.iter().all(|(_, entry)| self.validate(entry)),
            FormValue::List(entries) => entries
                .iter()
                .all(|entry| self.validate(&FormValue::String(String::from(entry)))),
            FormValue::Vec(entries) => entries.iter().all(|entry| self.validate(entry)),
        }
    }

    fn get_message(&self) -> &str {
        &self.message
    }
}

#[cfg(test)]
mod test {
    use crate::forms::constraints::FormConstraint;
    use crate::forms::FormValue;
    use std::collections::HashMap;

    #[test]
    fn not_blank() {
        use super::NotBlank;

        let validator = NotBlank::new("should be not blank");

        assert!(!validator.validate(&FormValue::Nothing));
        assert!(!validator.validate(&FormValue::String(String::from(""))));
        assert!(validator.validate(&FormValue::String(String::from("hello, world!"))));

        let mut hm: HashMap<String, FormValue> = HashMap::new();
        assert!(!validator.validate(&FormValue::Map(hm.clone())));
        hm.insert(String::from("1"), FormValue::Nothing);
        assert!(validator.validate(&FormValue::Map(hm.clone())));
    }

    #[test]
    fn is_true() {
        use super::IsTrue;

        let validator = IsTrue::new("should be true");

        assert!(!validator.validate(&FormValue::Nothing));
        assert!(validator.validate(&FormValue::Boolean(true)));
        assert!(!validator.validate(&FormValue::Boolean(false)));
        assert!(!validator.validate(&FormValue::String(String::from(""))));
        assert!(!validator.validate(&FormValue::String(String::from("hello, world!"))));
        assert!(validator.validate(&FormValue::String(String::from("true"))));
        assert!(!validator.validate(&FormValue::String(String::from("false"))));
    }
}