tank-core 0.31.0

Core of Tank: the Rust data layer. This is intended to be used by drivers to implement a backend.
Documentation 
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use crate::{Expression, Value, writer::SqlWriter};

/// Provides numeric precedence for expressions allowing sql writers to insert parentheses.
pub trait OpPrecedence {
    /// Lower numbers bind weaker, writers parenthesize when child precedence <= operator precedence.
    fn precedence(&self, writer: &dyn SqlWriter) -> i32;
}

impl<T: OpPrecedence> OpPrecedence for &T {
    fn precedence(&self, writer: &dyn SqlWriter) -> i32 {
        (*self).precedence(writer)
    }
}

impl OpPrecedence for &dyn Expression {
    fn precedence(&self, writer: &dyn SqlWriter) -> i32 {
        (*self).precedence(writer)
    }
}

impl OpPrecedence for () {
    fn precedence(&self, _writer: &dyn SqlWriter) -> i32 {
        1_000_000_000
    }
}

impl OpPrecedence for bool {
    fn precedence(&self, _writer: &dyn SqlWriter) -> i32 {
        0
    }
}

impl OpPrecedence for &'static str {
    fn precedence(&self, _writer: &dyn SqlWriter) -> i32 {
        0
    }
}

impl OpPrecedence for Value {
    fn precedence(&self, _writer: &dyn SqlWriter) -> i32 {
        0
    }
}