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Copy pathtypes.rs
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376 lines (355 loc) · 12.1 KB
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use crate::ast::{ContractStmt, EventField, Field, GenericArg, ModuleStmt, TypeDesc};
use crate::grammar::expressions::parse_expr;
use crate::grammar::functions::parse_single_word_stmt;
use crate::node::{Node, Span};
use crate::{ParseFailed, ParseResult, Parser, TokenKind};
use vec1::Vec1;
/// Parse a [`ModuleStmt::StructDef`].
/// # Panics
/// Panics if the next token isn't `struct`.
pub fn parse_struct_def(par: &mut Parser) -> ParseResult<Node<ModuleStmt>> {
use TokenKind::*;
let struct_tok = par.assert(Struct);
let name = par.expect_with_notes(Name, "failed to parse struct definition", || {
vec!["Note: a struct name must start with a letter or underscore, and contain letters, numbers, or underscores".into()]
})?;
let mut fields = vec![];
par.enter_block(struct_tok.span + name.span, "struct definition")?;
loop {
match par.peek() {
Some(Name) | Some(Pub) | Some(Const) => {
let pub_qual = parse_opt_qualifier(par, TokenKind::Pub);
let const_qual = parse_opt_qualifier(par, TokenKind::Const);
fields.push(parse_field(par, pub_qual, const_qual)?);
}
Some(Dedent) => {
par.next()?;
break;
}
Some(Pass) => {
parse_single_word_stmt(par)?;
}
None => break,
Some(_) => {
let tok = par.next()?;
par.unexpected_token_error(tok.span, "failed to parse struct def", vec![]);
return Err(ParseFailed);
}
}
}
let span = struct_tok.span + name.span + fields.last();
Ok(Node::new(
ModuleStmt::StructDef {
name: name.into(),
fields,
},
span,
))
}
/// Parse a type definition, e.g. `type MyMap = Map<u8, address>`.
/// # Panics
/// Panics if the next token isn't `type`.
pub fn parse_type_def(par: &mut Parser) -> ParseResult<Node<ModuleStmt>> {
let type_tok = par.assert(TokenKind::Type);
let name = par.expect(TokenKind::Name, "failed to parse type declaration")?;
par.expect_with_notes(TokenKind::Eq, "failed to parse type declaration", || {
vec![
"Note: a type alias name must be followed by an equals sign and a type description"
.into(),
format!("Example: `type {} = Map<address, u64>`", name.text),
]
})?;
let typ = parse_type_desc(par)?;
let span = type_tok.span + typ.span;
Ok(Node::new(
ModuleStmt::TypeDef {
name: name.into(),
typ,
},
span,
))
}
/// Parse an event definition.
/// # Panics
/// Panics if the next token isn't `event`.
pub fn parse_event_def(par: &mut Parser) -> ParseResult<Node<ContractStmt>> {
use TokenKind::*;
let event_tok = par.assert(Event);
let name = par.expect(Name, "failed to parse event definition")?;
let mut fields = vec![];
par.enter_block(event_tok.span + name.span, "event definition")?;
loop {
match par.peek() {
Some(Name) | Some(Idx) => {
fields.push(parse_event_field(par)?);
}
Some(Pass) => {
parse_single_word_stmt(par)?;
}
Some(Dedent) => {
par.next()?;
break;
}
None => break,
Some(_) => {
let tok = par.next()?;
par.unexpected_token_error(tok.span, "failed to parse event definition", vec![]);
return Err(ParseFailed);
}
}
}
let span = event_tok.span + name.span + fields.last();
Ok(Node::new(
ContractStmt::EventDef {
name: name.into(),
fields,
},
span,
))
}
/// Parse an event field, e.g. `foo: u8` or `idx from: address`.
pub fn parse_event_field(par: &mut Parser) -> ParseResult<Node<EventField>> {
let idx_qual = parse_opt_qualifier(par, TokenKind::Idx);
let name = par.expect(TokenKind::Name, "failed to parse event field")?;
par.expect_with_notes(TokenKind::Colon, "failed to parse event field", || {
vec![
"Note: event field name must be followed by a colon and a type description".into(),
format!(
"Example: `{}{}: address`",
if idx_qual.is_some() { "idx " } else { "" },
name.text
),
]
})?;
let typ = parse_type_desc(par)?;
par.expect_newline("event field")?;
let span = name.span + idx_qual + &typ;
Ok(Node::new(
EventField {
is_idx: idx_qual.is_some(),
name: Node::new(name.text.into(), name.span),
typ,
},
span,
))
}
/// Parse a field for a struct or contract. The leading optional `pub` and
/// `const` qualifiers must be parsed by the caller, and passed in.
/// Note that `event` fields are handled in [`parse_event_field`].
pub fn parse_field(
par: &mut Parser,
pub_qual: Option<Span>,
const_qual: Option<Span>,
) -> ParseResult<Node<Field>> {
let name = par.expect(TokenKind::Name, "failed to parse field definition")?;
par.expect_with_notes(TokenKind::Colon, "failed to parse field definition", || {
vec![
"Note: field name must be followed by a colon and a type description".into(),
format!(
"Example: {}{}{}: address",
if pub_qual.is_some() { "pub " } else { "" },
if const_qual.is_some() { "const " } else { "" },
name.text
),
]
})?;
let typ = parse_type_desc(par)?;
let value = if par.peek() == Some(TokenKind::Eq) {
par.next()?;
Some(parse_expr(par)?)
} else {
None
};
par.expect_newline("field definition")?;
let span = name.span + pub_qual + const_qual + &typ;
Ok(Node::new(
Field {
is_pub: pub_qual.is_some(),
is_const: const_qual.is_some(),
name: Node::new(name.text.into(), name.span),
typ,
value,
},
span,
))
}
/// Parse an optional qualifier (`pub`, `const`, or `idx`).
pub fn parse_opt_qualifier(par: &mut Parser, tk: TokenKind) -> Option<Span> {
if par.peek() == Some(tk) {
let tok = par.next().unwrap();
Some(tok.span)
} else {
None
}
}
/// Parse an angle-bracket-wrapped list of generic arguments (eg. the tail end
/// of `Map<address, u256>`).
/// # Panics
/// Panics if the first token isn't `<`.
pub fn parse_generic_args(par: &mut Parser) -> ParseResult<Node<Vec<GenericArg>>> {
use TokenKind::*;
let mut span = par.assert(Lt).span;
let mut args = vec![];
let expect_end = |par: &mut Parser| {
// If there's no comma, the next token must be `>`
match par.peek_or_err()? {
Gt => Ok(par.next()?.span),
GtGt => Ok(par.split_next()?.span),
_ => {
let tok = par.next()?;
par.unexpected_token_error(
tok.span,
"Unexpected token while parsing generic arg list",
vec![],
);
Err(ParseFailed)
}
}
};
loop {
match par.peek_or_err()? {
Gt => {
span += par.next()?.span;
break;
}
GtGt => {
span += par.split_next()?.span;
break;
}
Int => {
let tok = par.next()?;
if let Ok(num) = tok.text.parse() {
args.push(GenericArg::Int(Node::new(num, tok.span)));
if par.peek() == Some(Comma) {
par.next()?;
} else {
span += expect_end(par)?;
break;
}
} else {
par.error(tok.span, "failed to parse integer literal");
return Err(ParseFailed);
}
}
Name | ParenOpen => {
let typ = parse_type_desc(par)?;
args.push(GenericArg::TypeDesc(Node::new(typ.kind, typ.span)));
if par.peek() == Some(Comma) {
par.next()?;
} else {
span += expect_end(par)?;
break;
}
}
_ => {
let tok = par.next()?;
par.unexpected_token_error(
tok.span,
"failed to parse generic type argument list",
vec![],
);
return Err(ParseFailed);
}
}
}
Ok(Node::new(args, span))
}
/// Parse a type description, e.g. `u8` or `Map<address, u256>`.
pub fn parse_type_desc(par: &mut Parser) -> ParseResult<Node<TypeDesc>> {
use TokenKind::*;
let mut typ = match par.peek_or_err()? {
Name => {
let name = par.next()?;
match par.peek() {
Some(Lt) => {
let args = parse_generic_args(par)?;
let span = name.span + args.span;
Node::new(
TypeDesc::Generic {
base: name.into(),
args,
},
span,
)
}
_ => Node::new(
TypeDesc::Base {
base: name.text.into(),
},
name.span,
),
}
}
ParenOpen => {
let mut span = par.next()?.span;
let mut items = vec![];
loop {
match par.peek_or_err()? {
ParenClose => {
span += par.next()?.span;
break;
}
Name | ParenOpen => {
let item = parse_type_desc(par)?;
span += item.span;
items.push(item);
if par.peek_or_err()? == Comma {
par.next()?;
} else {
span += par
.expect(
ParenClose,
"Unexpected token while parsing tuple type description",
)?
.span;
break;
}
}
_ => {
let tok = par.next()?;
par.unexpected_token_error(
tok.span,
"failed to parse type description",
vec![],
);
return Err(ParseFailed);
}
}
}
if items.is_empty() {
Node::new(TypeDesc::Unit, span)
} else {
Node::new(
TypeDesc::Tuple {
items: Vec1::try_from_vec(items).expect("couldn't convert vec to vec1"),
},
span,
)
}
}
_ => {
let tok = par.next()?;
par.unexpected_token_error(tok.span, "failed to parse type description", vec![]);
return Err(ParseFailed);
}
};
while par.peek() == Some(BracketOpen) {
let ctx = "Unexpected token while parsing array type description.";
let mut span = typ.span + par.next()?.span;
let num = par.expect(Int, ctx)?;
if let Ok(dimension) = num.text.parse() {
span += par.expect(BracketClose, ctx)?.span;
typ = Node::new(
TypeDesc::Array {
typ: Box::new(typ),
dimension,
},
span,
);
} else {
par.error(num.span, "failed to parse number literal");
return Err(ParseFailed);
}
}
Ok(typ)
}