Split up and expand ast
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parent
4e94c13351
commit
037a0f69a3
9 changed files with 614 additions and 414 deletions
430
src/ast.rs
430
src/ast.rs
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@ -1,420 +1,22 @@
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use std::fmt;
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mod basic;
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mod call;
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mod expr;
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mod field;
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mod lit;
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mod table_constr;
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mod table_destr;
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mod var;
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use crate::span::{HasSpan, Span};
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#[derive(Clone)]
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pub struct Space {
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pub comment: Vec<(String, Span)>,
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pub span: Span,
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}
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impl fmt::Debug for Space {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("Space").finish()
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}
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}
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impl HasSpan for Space {
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fn span(&self) -> Span {
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self.span
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}
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}
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#[derive(Clone)]
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pub struct Ident {
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pub name: String,
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pub span: Span,
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}
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impl fmt::Debug for Ident {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "i#{}", self.name)
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}
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}
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impl HasSpan for Ident {
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fn span(&self) -> Span {
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self.span
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}
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}
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#[derive(Clone)]
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pub enum NumLitStr {
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/// - `0b_0001_1011`
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/// - `0b10`
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Bin(String),
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/// - `12_345`
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/// - `7`
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Dec(String),
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/// - `0x_c0_f3`
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/// - `0xB`
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Hex(String),
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}
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impl fmt::Debug for NumLitStr {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Bin(str) => write!(f, "0b{str}"),
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Self::Dec(str) => write!(f, "{str}"),
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Self::Hex(str) => write!(f, "0x{str}"),
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}
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}
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}
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/// Positive number literal.
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///
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/// Possible bases are binary, decimal, hexadecimal. Underscores can be inserted
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/// before and after any digit.
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#[derive(Clone)]
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pub struct NumLit {
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pub value: i64,
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pub str: NumLitStr,
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pub span: Span,
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}
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impl fmt::Debug for NumLit {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.str.fmt(f)
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}
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}
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impl HasSpan for NumLit {
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fn span(&self) -> Span {
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self.span
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}
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}
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#[derive(Debug, Clone)]
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pub enum StringLit {
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/// - `"Hello world\n"`
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/// - `""`
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Inline(String, Span),
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/// ```text
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/// """
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/// Hello,
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/// world!
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/// """
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/// ```
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Multiline(String, Span),
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}
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impl HasSpan for StringLit {
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fn span(&self) -> Span {
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match self {
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StringLit::Inline(_, span) => *span,
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StringLit::Multiline(_, span) => *span,
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}
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}
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}
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#[derive(Debug, Clone)]
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pub enum TableLitElem {
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/// `a`
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Positional(Box<Expr>),
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/// `foo: a`
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///
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/// Structure: `name s0 : s1 value`
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Named {
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name: Ident,
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s0: Space,
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s1: Space,
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value: Box<Expr>,
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},
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}
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impl HasSpan for TableLitElem {
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fn span(&self) -> Span {
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match self {
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TableLitElem::Positional(value) => value.span(),
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TableLitElem::Named { name, value, .. } => name.span().join(value.span()),
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}
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}
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}
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/// `'{ a, foo: b }`
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#[derive(Debug, Clone)]
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pub struct TableLit {
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pub elems: Vec<(Space, TableLitElem, Space)>,
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/// `Some` if there is a trailing comma, `None` otherwise.
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pub trailing_comma: Option<Space>,
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pub span: Span,
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}
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impl HasSpan for TableLit {
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fn span(&self) -> Span {
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self.span
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}
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}
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#[derive(Clone)]
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pub enum Lit {
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/// `nil`
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Nil(Span),
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/// - `true`
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/// - `false`
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Bool(bool, Span),
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/// See [`NumLit`].
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Num(NumLit),
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/// See [`StringLit`]
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String(StringLit),
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/// See [`TableLit`].
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Table(TableLit),
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}
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impl fmt::Debug for Lit {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::Nil(_) => write!(f, "l#nil"),
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Self::Bool(b, _) => write!(f, "l#{b:?}"),
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Self::Num(n) => write!(f, "l#{n:?}"),
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Self::String(s) => write!(f, "l#{s:?}"),
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Self::Table(t) => {
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write!(f, "l#")?;
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t.fmt(f)
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}
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}
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}
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}
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impl HasSpan for Lit {
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fn span(&self) -> Span {
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match self {
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Lit::Nil(span) => *span,
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Lit::Bool(_, span) => *span,
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Lit::Num(n) => n.span(),
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Lit::String(s) => s.span(),
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Lit::Table(t) => t.span(),
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}
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}
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}
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#[derive(Debug, Clone)]
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pub enum TableConstrElem {
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/// See [`TableLitElem`].
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Lit(TableLitElem),
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/// `[a]: b`
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///
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/// Structure: `[ s0 index s1 ] s2 : s3 value`
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Indexed {
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s0: Space,
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index: Box<Expr>,
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s1: Space,
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s2: Space,
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s3: Space,
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value: Box<Expr>,
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span: Span,
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},
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}
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impl HasSpan for TableConstrElem {
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fn span(&self) -> Span {
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match self {
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TableConstrElem::Lit(lit) => lit.span(),
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TableConstrElem::Indexed { span, .. } => *span,
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}
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}
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}
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/// `{ a, b, foo: c, [d]: e }`
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#[derive(Debug, Clone)]
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pub struct TableConstr {
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pub elems: Vec<(Space, TableConstrElem, Space)>,
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/// `Some` if there is a trailing comma, `None` otherwise.
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pub trailing_comma: Option<Space>,
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pub span: Span,
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}
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impl HasSpan for TableConstr {
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fn span(&self) -> Span {
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self.span
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}
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}
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#[derive(Debug, Clone, Copy)]
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pub enum BinOp {
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/// `+`
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Add,
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/// `-`
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Sub,
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/// `*`
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Mul,
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/// `/`
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Div,
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/// `%`
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Mod,
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/// `==`
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Eq,
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/// `!=`
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Neq,
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/// `and`
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And,
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/// `or`
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Or,
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}
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#[derive(Debug, Clone)]
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pub enum Expr {
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Lit(Lit),
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/// `(a)`
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///
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/// Structure: `( s0 inner s1 )`
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Paren {
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s0: Space,
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inner: Box<Expr>,
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s1: Space,
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span: Span,
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},
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/// See [`TableConstr`].
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TableConstr(TableConstr),
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/// `[a]`
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///
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/// Structure: `[ s0 index s1 ]`
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Var {
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s0: Space,
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index: Box<Expr>,
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s1: Space,
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span: Span,
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},
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/// `foo`
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VarIdent(Ident),
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/// `[a] = b`
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///
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/// Structure: `[ s0 index s1 ] s2 = s3 value`
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VarAssign {
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s0: Space,
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index: Box<Expr>,
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s1: Space,
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s2: Space,
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s3: Space,
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value: Box<Expr>,
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span: Span,
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},
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/// `foo = a`
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///
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/// Structure: `name s0 = s1 value`
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VarIdentAssign {
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name: Ident,
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s0: Space,
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s1: Space,
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value: Box<Expr>,
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},
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/// `-a`
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///
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/// Structure: `- s0 expr`
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Neg {
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minus: Span,
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s0: Space,
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expr: Box<Expr>,
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},
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/// `not a`
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///
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/// Structure: `'not' s0 expr`
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Not {
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not: Span,
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s0: Space,
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expr: Box<Expr>,
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},
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/// `a[b]`
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///
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/// Structure: `expr s0 [ s1 index s2 ]`
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Field {
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expr: Box<Expr>,
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s0: Space,
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s1: Space,
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index: Box<Expr>,
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s2: Space,
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span: Span,
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},
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/// `a.foo`
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///
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/// Structure: `expr s0 . s1 ident`
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FieldIdent {
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expr: Box<Expr>,
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s0: Space,
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s1: Space,
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ident: Ident,
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},
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/// `a[b] = c`
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///
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/// Structure: `expr s0 [ s1 index s2 ] s3 = s4 value`
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FieldAssign {
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expr: Box<Expr>,
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s0: Space,
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s1: Space,
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index: Box<Expr>,
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s2: Space,
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s3: Space,
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s4: Space,
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value: Box<Expr>,
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},
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/// `a.foo = b`
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///
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/// Structure: `expr s0 . s1 ident s2 = s3 value`
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FieldIdentAssign {
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expr: Box<Expr>,
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s0: Space,
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s1: Space,
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ident: Ident,
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s2: Space,
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s3: Space,
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value: Box<Expr>,
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},
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/// - `a + b`
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/// - `a == b`
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/// - `a and b`
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///
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/// Structure: `left s0 op s1 right`
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BinOp {
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left: Box<Expr>,
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s0: Space,
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op: BinOp,
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s1: Space,
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right: Box<Expr>,
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},
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}
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impl HasSpan for Expr {
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fn span(&self) -> Span {
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match self {
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Expr::Lit(lit) => lit.span(),
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Expr::Paren { span, .. } => *span,
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Expr::TableConstr(tcr) => tcr.span(),
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Expr::Var { span, .. } => *span,
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Expr::VarIdent(name) => name.span(),
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Expr::VarAssign { span, .. } => *span,
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Expr::VarIdentAssign { name, value, .. } => name.span().join(value.span()),
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Expr::Neg { minus, expr, .. } => minus.join(expr.span()),
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Expr::Not { not, expr, .. } => not.join(expr.span()),
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Expr::Field { span, .. } => *span,
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Expr::FieldIdent { expr, ident, .. } => expr.span().join(ident.span()),
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Expr::FieldAssign { expr, value, .. } => expr.span().join(value.span()),
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Expr::FieldIdentAssign { expr, value, .. } => expr.span().join(value.span()),
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Expr::BinOp { left, right, .. } => left.span().join(right.span()),
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}
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}
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}
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pub use self::basic::*;
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pub use self::call::*;
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pub use self::expr::*;
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pub use self::field::*;
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pub use self::lit::*;
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pub use self::table_constr::*;
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pub use self::table_destr::*;
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pub use self::var::*;
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#[derive(Debug, Clone)]
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pub struct Program {
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