rustyroad 1.6.0

Rusty Road is a framework written in Rust that is based on Ruby on Rails. It is designed to provide the familiar conventions and ease of use of Ruby on Rails, while also taking advantage of the performance and efficiency of Rust.
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use super::BreakingChangeKind;

pub(super) fn classify(line: &str) -> Vec<BreakingChangeKind> {
    let sql = normalize(line);
    if sql.is_empty() || sql.starts_with("--") {
        return Vec::new();
    }
    let mut kinds = Vec::new();
    if is_type_change(&sql) {
        kinds.push(BreakingChangeKind::ColumnTypeChange);
    }
    if sql.contains(" USING ") || sql.contains("CAST(") || sql.contains("::") {
        kinds.push(BreakingChangeKind::ExplicitCast);
    }
    if sql.contains("DROP CONSTRAINT") || sql.contains("DROP FOREIGN KEY") {
        kinds.push(BreakingChangeKind::ConstraintDrop);
    }
    kinds
}

fn normalize(line: &str) -> String {
    line.split_whitespace()
        .collect::<Vec<_>>()
        .join(" ")
        .to_uppercase()
}

fn is_type_change(sql: &str) -> bool {
    sql.contains("ALTER COLUMN") && (sql.contains(" TYPE ") || sql.ends_with(" TYPE"))
        || sql.contains(" MODIFY COLUMN ")
        || sql.starts_with("MODIFY COLUMN ")
        || sql.contains(" CHANGE COLUMN ")
        || sql.starts_with("CHANGE COLUMN ")
}