biome_js_formatter 0.0.2

Biome's JavaScript formatter
Documentation 
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use crate::prelude::*;
use biome_formatter::write;

use crate::parentheses::{unary_like_expression_needs_parentheses, NeedsParentheses};
use biome_js_syntax::JsPostUpdateExpressionFields;
use biome_js_syntax::{JsPostUpdateExpression, JsSyntaxNode};

#[derive(Debug, Clone, Default)]
pub(crate) struct FormatJsPostUpdateExpression;

impl FormatNodeRule<JsPostUpdateExpression> for FormatJsPostUpdateExpression {
    fn fmt_fields(&self, node: &JsPostUpdateExpression, f: &mut JsFormatter) -> FormatResult<()> {
        let JsPostUpdateExpressionFields {
            operand,
            operator_token,
        } = node.as_fields();

        write![f, [operand.format(), operator_token.format()]]
    }

    fn needs_parentheses(&self, item: &JsPostUpdateExpression) -> bool {
        item.needs_parentheses()
    }
}

impl NeedsParentheses for JsPostUpdateExpression {
    fn needs_parentheses_with_parent(&self, parent: &JsSyntaxNode) -> bool {
        unary_like_expression_needs_parentheses(self.syntax(), parent)
    }
}

#[cfg(test)]
mod tests {

    use crate::{assert_needs_parentheses, assert_not_needs_parentheses};
    use biome_js_syntax::JsPostUpdateExpression;

    #[test]
    fn needs_parentheses() {
        assert_needs_parentheses!("class A extends (A++) {}", JsPostUpdateExpression);

        assert_needs_parentheses!("(a++).b", JsPostUpdateExpression);
        assert_needs_parentheses!("(a++)[b]", JsPostUpdateExpression);
        assert_not_needs_parentheses!("a[b++]", JsPostUpdateExpression);

        assert_needs_parentheses!("(a++)`template`", JsPostUpdateExpression);

        assert_needs_parentheses!("(a++)()", JsPostUpdateExpression);
        assert_needs_parentheses!("new (a++)()", JsPostUpdateExpression);

        assert_needs_parentheses!("(a++)!", JsPostUpdateExpression);

        assert_needs_parentheses!("(a++) ** 3", JsPostUpdateExpression);
        assert_not_needs_parentheses!("(a++) + 3", JsPostUpdateExpression);
    }
}