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Add do-while statements

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Tad Hardesty 2018-03-06 18:16:39 -08:00
parent 9b82622048
commit 0aae716b0c
2 changed files with 10 additions and 0 deletions
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1
src/dreammaker/ast.rs
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@ -300,5 +300,6 @@ pub enum Statement {
Expr(Expression),
Return(Option<Expression>),
While(Expression, Vec<Statement>),
DoWhile(Vec<Statement>, Expression),
If(Vec<(Expression, Vec<Statement>)>, Option<Vec<Statement>>),
}

9
src/dreammaker/parser.rs
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@ -546,6 +546,15 @@ impl<I> Parser<I> where
let expr = require!(self.expression(false));
require!(self.exact(Token::Punct(Punctuation::RParen)));
success(Statement::While(expr, require!(self.block())))
} else if let Some(()) = self.exact_ident("do")? {
// statement :: 'do' block 'while' '(' expression ')' ';'
let block = require!(self.block());
require!(self.exact_ident("while"));
require!(self.exact(Token::Punct(Punctuation::LParen)));
let expr = require!(self.expression(false));
require!(self.exact(Token::Punct(Punctuation::RParen)));
require!(self.exact(Token::Punct(Punctuation::Semicolon)));
success(Statement::DoWhile(block, expr))
// SINGLE-LINE STATEMENTS
} else if let Some(()) = self.exact_ident("return")? {
// statement :: 'return' expression ';'