galvan-ast 0.0.1

AST for the Galvan programming language
Documentation 
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use derive_more::From;
use typeunion::type_union;

use galvan_ast_macro::AstNode;

use crate::{AstNode, Expression, Span};

#[type_union]
#[derive(Clone, Debug, PartialEq, Eq, AstNode)]
pub type Literal = StringLiteral + NumberLiteral + BooleanLiteral + NoneLiteral + CharLiteral;

#[derive(Clone, Debug, PartialEq, Eq, From)]
pub struct StringLiteral {
    pub value: String,
    pub interpolations: Vec<Expression>, // Expressions found in {expr} within the string
    pub span: Span,
}

impl AstNode for StringLiteral {
    fn span(&self) -> Span {
        self.span
    }

    fn print(&self, indent: usize) -> String {
        if self.interpolations.is_empty() {
            format!("{}\"{}\"", " ".repeat(indent), self.value)
        } else {
            format!("{}\"{}\" (with {} interpolations)", " ".repeat(indent), self.value, self.interpolations.len())
        }
    }
}

impl StringLiteral {
    pub fn as_str(&self) -> &str {
        &self.value
    }
}

impl From<StringLiteral> for String {
    fn from(string: StringLiteral) -> Self {
        string.value
    }
}

impl AsRef<str> for StringLiteral {
    fn as_ref(&self) -> &str {
        self.as_str()
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
// TODO: Parse number literal and validate type
pub struct NumberLiteral {
    pub value: String,
    pub span: Span,
}

impl AstNode for NumberLiteral {
    fn span(&self) -> Span {
        self.span
    }

    fn print(&self, indent: usize) -> String {
        format!("{}{}", " ".repeat(indent), self.value)
    }
}

impl NumberLiteral {
    pub fn as_str(&self) -> &str {
        &self.value
    }
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, From)]
pub struct BooleanLiteral {
    pub value: bool,
    pub span: Span,
}

impl AstNode for BooleanLiteral {
    fn span(&self) -> Span {
        self.span
    }

    fn print(&self, indent: usize) -> String {
        format!("{}{}", " ".repeat(indent), self.value)
    }
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct NoneLiteral(pub Span);

impl AstNode for NoneLiteral {
    fn span(&self) -> Span {
        self.0
    }

    fn print(&self, indent: usize) -> String {
        format!("{}None", " ".repeat(indent))
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CharLiteral {
    pub value: char,
    pub span: Span,
}

impl AstNode for CharLiteral {
    fn span(&self) -> Span {
        self.span
    }

    fn print(&self, indent: usize) -> String {
        format!("{}'{}'", " ".repeat(indent), self.value)
    }
}

impl CharLiteral {
    pub fn as_char(&self) -> char {
        self.value
    }
}