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parse constant definition statements

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This commit is contained in:
evan-schott 2023-09-22 13:05:40 -07:00
parent 422ba16877
commit 40f7ce2649
1 changed files with 31 additions and 0 deletions
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31
compiler/parser/src/parser/statement.rs
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@ -45,6 +45,7 @@ impl ParserContext<'_> {
Token::For => Ok(Statement::Iteration(Box::new(self.parse_loop_statement()?))),
Token::Assert | Token::AssertEq | Token::AssertNeq => Ok(self.parse_assert_statement()?),
Token::Let => Ok(Statement::Definition(self.parse_definition_statement()?)),
Token::Const => Ok(Statement::Definition(self.parse_const_definition_statement()?)),
Token::LeftCurly => Ok(Statement::Block(self.parse_block()?)),
Token::Console => Err(ParserError::console_statements_are_not_yet_supported(self.token.span).into()),
Token::Finalize => Err(ParserError::finalize_statements_are_deprecated(self.token.span).into()),
@ -314,6 +315,36 @@ impl ParserContext<'_> {
Ok(ConsoleStatement { span: keyword + span, function, id: self.node_builder.next_id() })
}
/// Returns a [`DefinitionStatement`] AST node if the next tokens represent a const definition statement.
pub(super) fn parse_const_definition_statement(&mut self) -> Result<DefinitionStatement> {
self.expect(&Token::Const)?;
let decl_span = self.prev_token.span;
let decl_type = match &self.prev_token.token {
Token::Const => DeclarationType::Const,
_ => unreachable!(
"parse_const_definition_statement shouldn't produce this as have already ensured that first token was 'Const'"
),
};
// Parse variable name and type.
let place = self.parse_expression()?;
self.expect(&Token::Colon)?;
let type_ = self.parse_type()?.0;
self.expect(&Token::Assign)?;
let value = self.parse_expression()?;
self.expect(&Token::Semicolon)?;
Ok(DefinitionStatement {
span: decl_span + value.span(),
declaration_type: decl_type,
place,
type_,
value,
id: self.node_builder.next_id(),
})
}
/// Returns a [`DefinitionStatement`] AST node if the next tokens represent a definition statement.
pub(super) fn parse_definition_statement(&mut self) -> Result<DefinitionStatement> {
self.expect(&Token::Let)?;