1254 lines
42 KiB
Rust
1254 lines
42 KiB
Rust
use std::rc::Rc;
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use std::iter::Peekable;
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use std::vec::IntoIter;
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use tokenizing::*;
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use tokenizing::Kw::*;
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use tokenizing::TokenType::*;
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use ast::*;
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use builtin::{BinOp, PrefixOp};
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/* Schala EBNF Grammar */
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/* Terminal productions are in 'single quotes' or UPPERCASE if they are a class
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* or not representable in ASCII
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/* Top-level Structure */
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program := (statement delimiter)* EOF
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delimiter := NEWLINE | ';'
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statement := expression | declaration
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block := '{' (statement delimiter)* '}'
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declaration := type_declaration | func_declaration | binding_declaration | impl_declaration
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/* Declarations - Types */
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type_declaration := 'type' type_declaration_body
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type_declaration_body := 'alias' type_alias | type_singleton_name '=' type_body
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type_alias := IDENTIFIER '=' type_name
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type_body := variant_specifier ('|' variant_specifier)*
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variant_specifier := IDENTIFIER | IDENTIFIER '{' typed_identifier_list '}' | IDENTIFIER '(' type_name* ')'
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typed_identifier_list := typed_identifier*
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typed_identifier := IDENTIFIER type_anno
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/* Declaration - Functions */
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func_declaration := func_signature func_body
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func_body := ε | '{' (statement delimiter)* '}'
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func_signature := 'fn' IDENTIFIER formal_param_list func_body
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formal_param_list := '(' (formal_param ',')* ')'
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formal_param := IDENTIFIER type_anno+
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/* Declaration - Variable bindings */
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binding_declaration: 'var' IDENTIFIER '=' expression | 'const' IDENTIFIER '=' expression
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/* Declaration - Interface */
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interface_declaration := 'interface' interface_name signature_block
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impl_declaration := 'impl' IDENTIFIER decl_block | 'impl' interface_name 'for' IDENTIFIER decl_block
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decl_block := '{' (func_declaration)* '}'
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signature_block := '{' (func_signature)* '}'
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interface_name := IDENTIFIER
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/* Type annotations */
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type_anno := (':' type_name)+
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type_name := type_singleton_name | '(' type_names ')'
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type_names := ε | type_name (, type_name)*
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type_singleton_name = IDENTIFIER (type_params)*
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type_params := '<' type_name (, type_name)* '>'
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/* Expressions */
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expression := precedence_expr type_anno+
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precedence_expr := prefix_expr
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prefix_expr := prefix_op call_expr
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prefix_op := '+' | '-' | '!' | '~'
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call_expr := index_expr ( '(' expr_list ')' )*
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expr_list := expression (',' expression)* | ε
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index_expr := primary ( '[' (expression (',' (expression)* | ε) ']' )*
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primary := literal | paren_expr | if_expr | match_expr | for_expr | while_expr | identifier_expr | curly_brace_expr | list_expr
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/* Primary Expressions */
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curly_brace_expr := lambda_expr | anonymous_struct //TODO
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list_expr := '[' (expression, ',')* ']'
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lambda_expr := '{' '|' (formal_param ',')* '|' (type_anno)* (statement delimiter)* '}'
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paren_expr := LParen paren_inner RParen
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paren_inner := (expression ',')*
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identifier_expr := named_struct | IDENTIFIER
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/* Expression - Literals */
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literal := 'true' | 'false' | number_literal | STR_LITERAL
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named_struct := IDENTIFIER record_block
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record_block := '{' (record_entry, ',')* | '}' //TODO support anonymus structs, update syntax
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record_entry := IDENTIFIER ':' expression
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anonymous_struct := TODO
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// a float_literal can still be assigned to an int in type-checking
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number_literal := int_literal | float_literal
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int_literal = ('0x' | '0b') digits
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float_literal := digits ('.' digits)
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digits := (DIGIT_GROUP underscore)+
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/* Expression - If */
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if_expr := 'if' expression block else_clause
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else_clause := ε | 'else' block
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/* Expression - Match */
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match_expr := 'match' expression match_body
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match_body := '{' (match_arm)* '}'
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match_arm := pattern '=>' expression
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pattern := identifier //TODO NOT DONE
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/* Expression - While */
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while_expr := 'while' while_cond '{' (statement delimiter)* '}'
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while_cond := ε | expression | expression 'is' pattern //TODO maybe is-expresions should be primary
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//TODO this implies there must be at least one enumerator, which the parser doesn't support right
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//this second, and maybe should fail later anyway
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/* Expression - For */
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for_expr := 'for' (enumerator | '{' enumerators '}') for_expr_body
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for_expr_body := 'return' expression | '{' (statement delimiter)* '}
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enumerators := enumerator (',' enumerators)*
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enumerator := identifier '<-' expression | identifier '=' expression //TODO add guards, etc.
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*/
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type TokenIter = Peekable<IntoIter<Token>>;
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#[derive(Debug, PartialEq)]
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pub struct ParseError {
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pub msg: String,
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}
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impl ParseError {
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fn new<T>(msg: &str) -> ParseResult<T> {
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Err(ParseError { msg: msg.to_string() })
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}
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}
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pub type ParseResult<T> = Result<T, ParseError>;
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#[derive(Debug)]
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pub struct ParseRecord {
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production_name: String,
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next_token: String,
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level: u32,
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}
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struct Parser {
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tokens: TokenIter,
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parse_record: Vec<ParseRecord>,
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parse_level: u32,
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restrictions: ParserRestrictions,
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}
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struct ParserRestrictions {
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no_struct_literal: bool
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}
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impl Parser {
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fn new(input: Vec<Token>) -> Parser {
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Parser {
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tokens: input.into_iter().peekable(),
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parse_record: vec![],
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parse_level: 0,
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restrictions: ParserRestrictions { no_struct_literal: false }
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}
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}
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fn peek(&mut self) -> TokenType {
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self.tokens.peek().map(|ref t| { t.token_type.clone() }).unwrap_or(TokenType::EOF)
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}
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fn peek_with_token_offset(&mut self) -> Token {
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self.tokens.peek().map(|t: &Token| { t.clone()}).unwrap_or(Token { token_type: TokenType::EOF, offset: (0,0)})
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}
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fn next(&mut self) -> TokenType {
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self.tokens.next().map(|ref t| { t.token_type.clone() }).unwrap_or(TokenType::EOF)
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}
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}
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macro_rules! print_token_pattern {
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($tokenpattern:pat) => { stringify!($tokenpattern) }
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}
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macro_rules! expect {
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($self:expr, $token_type:pat) => { expect!($self, $token_type if true) };
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($self:expr, $token_type:pat if $cond:expr) => {
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match $self.peek() {
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$token_type if $cond => $self.next(),
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tok => {
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let msg = format!("Expected {}, got {:?}", print_token_pattern!($token_type), tok);
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return Err(ParseError { msg })
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}
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}
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}
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}
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macro_rules! parse_method {
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($name:ident(&mut $self:ident) -> $type:ty $body:block) => {
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fn $name(&mut $self) -> $type {
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let next_token = $self.peek_with_token_offset();
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let record = ParseRecord {
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production_name: stringify!($name).to_string(),
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next_token: format!("{}", next_token.to_string_with_metadata()),
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level: $self.parse_level,
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};
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$self.parse_level += 1;
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$self.parse_record.push(record);
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let result = { $body };
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if $self.parse_level != 0 {
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$self.parse_level -= 1;
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}
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result
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}
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};
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}
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macro_rules! delimited {
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($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat, nonstrict) => {
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delimited!($self, $start, $parse_fn, $( $delim )|*, $end, false)
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};
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($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat) => {
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delimited!($self, $start, $parse_fn, $( $delim )|*, $end, true)
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};
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($self:expr, $start:pat, $parse_fn:ident, $( $delim:pat )|+, $end:pat, $strictness:expr) => {
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{
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expect!($self, $start);
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let mut acc = vec![];
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loop {
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let peek = $self.peek();
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match peek {
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$end | EOF => break,
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_ => (),
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}
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if !$strictness {
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match peek {
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$( $delim )|* => { $self.next(); continue },
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_ => ()
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}
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}
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acc.push($self.$parse_fn()?);
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match $self.peek() {
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$( $delim )|* => { $self.next(); continue },
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_ if $strictness => break,
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_ => continue,
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};
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}
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expect!($self, $end);
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acc
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}
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};
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}
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impl Parser {
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parse_method!(program(&mut self) -> ParseResult<AST> {
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let mut statements = Vec::new();
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loop {
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match self.peek() {
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EOF => break,
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Newline | Semicolon => {
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self.next();
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continue;
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},
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_ => statements.push(self.statement()?),
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}
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}
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Ok(AST(statements))
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});
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parse_method!(statement(&mut self) -> ParseResult<Statement> {
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//TODO handle error recovery here
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match self.peek() {
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Keyword(Type) => self.type_declaration().map(|decl| { Statement::Declaration(decl) }),
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Keyword(Func)=> self.func_declaration().map(|func| { Statement::Declaration(func) }),
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Keyword(Var) | Keyword(Const) => self.binding_declaration().map(|decl| Statement::Declaration(decl)),
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Keyword(Interface) => self.interface_declaration().map(|decl| Statement::Declaration(decl)),
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Keyword(Impl) => self.impl_declaration().map(|decl| Statement::Declaration(decl)),
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_ => self.expression().map(|expr| { Statement::ExpressionStatement(expr) } ),
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}
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});
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parse_method!(type_declaration(&mut self) -> ParseResult<Declaration> {
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expect!(self, Keyword(Type));
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self.type_declaration_body()
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});
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parse_method!(type_declaration_body(&mut self) -> ParseResult<Declaration> {
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if let Keyword(Alias) = self.peek() {
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self.type_alias()
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} else {
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let name = self.type_singleton_name()?;
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expect!(self, Operator(ref c) if **c == "=");
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let body = self.type_body()?;
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Ok(Declaration::TypeDecl(name, body))
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}
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});
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parse_method!(type_alias(&mut self) -> ParseResult<Declaration> {
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expect!(self, Keyword(Alias));
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let alias = self.identifier()?;
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expect!(self, Operator(ref c) if **c == "=");
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let original = self.identifier()?;
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Ok(Declaration::TypeAlias(alias, original))
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});
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parse_method!(type_body(&mut self) -> ParseResult<TypeBody> {
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let mut variants = Vec::new();
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variants.push(self.variant_specifier()?);
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loop {
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if let Pipe = self.peek() {
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self.next();
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variants.push(self.variant_specifier()?);
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} else {
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break;
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}
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}
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Ok(TypeBody(variants))
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});
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parse_method!(variant_specifier(&mut self) -> ParseResult<Variant> {
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use self::Variant::*;
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let name = self.identifier()?;
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match self.peek() {
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LParen => {
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let tuple_members = delimited!(self, LParen, type_name, Comma, RParen);
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Ok(TupleStruct(name, tuple_members))
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},
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LCurlyBrace => {
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let typed_identifier_list = delimited!(self, LCurlyBrace, typed_identifier, Comma, RCurlyBrace);
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Ok(Record(name, typed_identifier_list))
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},
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_ => Ok(UnitStruct(name))
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}
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});
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parse_method!(typed_identifier(&mut self) -> ParseResult<(Rc<String>, TypeName)> {
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let identifier = self.identifier()?;
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expect!(self, Colon);
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let type_name = self.type_name()?;
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Ok((identifier, type_name))
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});
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parse_method!(func_declaration(&mut self) -> ParseResult<Declaration> {
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let signature = self.signature()?;
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if let LCurlyBrace = self.peek() {
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let statements = delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
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Ok(Declaration::FuncDecl(signature, statements))
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} else {
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Ok(Declaration::FuncSig(signature))
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}
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});
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parse_method!(signature(&mut self) -> ParseResult<Signature> {
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expect!(self, Keyword(Func));
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let name = self.identifier()?;
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let params = delimited!(self, LParen, formal_param, Comma, RParen);
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let type_anno = match self.peek() {
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Colon => Some(self.type_anno()?),
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_ => None,
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};
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Ok(Signature { name, params, type_anno })
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});
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parse_method!(formal_param(&mut self) -> ParseResult<FormalParam> {
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let name = self.identifier()?;
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let ty = match self.peek() {
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Colon => Some(self.type_anno()?),
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_ => None
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};
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Ok((name, ty))
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});
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parse_method!(binding_declaration(&mut self) -> ParseResult<Declaration> {
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let constant = match self.next() {
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Keyword(Var) => false,
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Keyword(Const) => true,
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_ => return ParseError::new("Expected 'var' or 'const'"),
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};
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let name = self.identifier()?;
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expect!(self, Operator(ref o) if **o == "=");
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let expr = self.expression()?;
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Ok(Declaration::Binding { name, constant, expr })
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});
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parse_method!(interface_declaration(&mut self) -> ParseResult<Declaration> {
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expect!(self, Keyword(Interface));
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let name = self.identifier()?;
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let signatures = self.signature_block()?;
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Ok(Declaration::Interface { name, signatures })
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});
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parse_method!(signature_block(&mut self) -> ParseResult<Vec<Signature>> {
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Ok(delimited!(self, LCurlyBrace, signature, Newline | Semicolon, RCurlyBrace, nonstrict))
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});
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parse_method!(impl_declaration(&mut self) -> ParseResult<Declaration> {
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expect!(self, Keyword(Impl));
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let first = self.type_name()?;
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let second = if let Keyword(For) = self.peek() {
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self.next();
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Some(self.type_name()?)
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} else {
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None
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};
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let block = self.decl_block()?;
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let result = match (first, second) {
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(first, Some(second)) => {
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match first {
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TypeName::Singleton(TypeSingletonName { ref name, ref params }) if params.len() == 0 =>
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Declaration::Impl { type_name: second, interface_name: Some(name.clone()), block },
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_ => return ParseError::new(&format!("Invalid name for an interface")),
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}
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},
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(first, None) => Declaration::Impl { type_name: first, interface_name: None, block }
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};
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Ok(result)
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});
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parse_method!(decl_block(&mut self) -> ParseResult<Vec<Declaration>> {
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Ok(delimited!(self, LCurlyBrace, func_declaration, Newline | Semicolon, RCurlyBrace, nonstrict))
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});
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parse_method!(expression(&mut self) -> ParseResult<Expression> {
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let mut expr_body = self.precedence_expr(BinOp::min_precedence())?;
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let type_anno = match self.peek() {
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Colon => Some(self.type_anno()?),
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_ => None
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};
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if let Some(_) = expr_body.1 {
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return ParseError::new("Bad parse state");
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}
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expr_body.1 = type_anno;
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Ok(expr_body)
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});
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parse_method!(type_anno(&mut self) -> ParseResult<TypeName> {
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expect!(self, Colon);
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self.type_name()
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});
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parse_method!(type_name(&mut self) -> ParseResult<TypeName> {
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use self::TypeName::*;
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Ok(match self.peek() {
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LParen => Tuple(delimited!(self, LParen, type_name, Comma, RParen)),
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_ => Singleton(self.type_singleton_name()?),
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})
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});
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parse_method!(type_singleton_name(&mut self) -> ParseResult<TypeSingletonName> {
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Ok(TypeSingletonName {
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name: self.identifier()?,
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params: match self.peek() {
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LAngleBracket => delimited!(self, LAngleBracket, type_name, Comma, RAngleBracket),
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_ => vec![],
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}
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})
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});
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// this implements Pratt parsing, see http://journal.stuffwithstuff.com/2011/03/19/pratt-parsers-expression-parsing-made-easy/
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fn precedence_expr(&mut self, precedence: i32) -> ParseResult<Expression> {
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let record = ParseRecord {
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production_name: "precedence_expr".to_string(),
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next_token: format!("{}", self.peek_with_token_offset().to_string_with_metadata()),
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level: self.parse_level,
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};
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self.parse_level += 1;
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self.parse_record.push(record);
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let mut lhs = self.prefix_expr()?;
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loop {
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let new_precedence = match self.peek() {
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Operator(op) => BinOp::get_precedence(&*op),
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Period => BinOp::get_precedence("."),
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Pipe => BinOp::get_precedence("|"),
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Slash => BinOp::get_precedence("/"),
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_ => break,
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};
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if precedence >= new_precedence {
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break;
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}
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let sigil = match self.next() {
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Operator(op) => op,
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Period => Rc::new(".".to_string()),
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Pipe => Rc::new("|".to_string()),
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Slash => Rc::new("/".to_string()),
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_ => unreachable!(),
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};
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let rhs = self.precedence_expr(new_precedence)?;
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let operation = BinOp::from_sigil(sigil.as_ref());
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lhs = Expression(ExpressionType::BinExp(operation, bx!(lhs), bx!(rhs)), None);
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}
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self.parse_level -= 1;
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Ok(lhs)
|
|
}
|
|
|
|
parse_method!(prefix_expr(&mut self) -> ParseResult<Expression> {
|
|
match self.peek() {
|
|
Operator(ref op) if PrefixOp::is_prefix(&*op) => {
|
|
let sigil = match self.next() {
|
|
Operator(op) => op,
|
|
_ => unreachable!(),
|
|
};
|
|
let expr = self.primary()?;
|
|
Ok(Expression(
|
|
ExpressionType::PrefixExp(PrefixOp::from_sigil(sigil.as_str()), bx!(expr)),
|
|
None))
|
|
},
|
|
_ => self.call_expr()
|
|
}
|
|
});
|
|
|
|
parse_method!(call_expr(&mut self) -> ParseResult<Expression> {
|
|
let index = self.index_expr()?;
|
|
Ok(if let LParen = self.peek() {
|
|
let arguments = delimited!(self, LParen, expression, Comma, RParen);
|
|
Expression(ExpressionType::Call { f: bx!(index), arguments }, None) //TODO fix this none
|
|
} else {
|
|
index
|
|
})
|
|
});
|
|
|
|
parse_method!(index_expr(&mut self) -> ParseResult<Expression> {
|
|
let primary = self.primary()?;
|
|
Ok(if let LSquareBracket = self.peek() {
|
|
let indexers = delimited!(self, LSquareBracket, expression, Comma, RSquareBracket);
|
|
Expression(ExpressionType::Index {
|
|
indexee: bx!(Expression(primary.0, None)),
|
|
indexers,
|
|
}, None)
|
|
} else {
|
|
primary
|
|
})
|
|
});
|
|
|
|
parse_method!(primary(&mut self) -> ParseResult<Expression> {
|
|
match self.peek() {
|
|
LCurlyBrace => self.curly_brace_expr(),
|
|
LParen => self.paren_expr(),
|
|
LSquareBracket => self.list_expr(),
|
|
Keyword(Kw::If) => self.if_expr(),
|
|
//Keyword(Kw::Match) => self.match_expr(),
|
|
Keyword(Kw::For) => self.for_expr(),
|
|
Keyword(Kw::While) => self.while_expr(),
|
|
Identifier(_) => self.identifier_expr(),
|
|
_ => self.literal(),
|
|
}
|
|
});
|
|
|
|
parse_method!(list_expr(&mut self) -> ParseResult<Expression> {
|
|
let exprs = delimited!(self, LSquareBracket, expression, Comma, RSquareBracket);
|
|
Ok(Expression(ExpressionType::ListLiteral(exprs), None))
|
|
});
|
|
|
|
parse_method!(curly_brace_expr(&mut self) -> ParseResult<Expression> {
|
|
self.lambda_expr()
|
|
});
|
|
|
|
parse_method!(lambda_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, LCurlyBrace);
|
|
let params = delimited!(self, Pipe, formal_param, Comma, Pipe);
|
|
let mut body = Vec::new();
|
|
loop {
|
|
match self.peek() {
|
|
EOF | RCurlyBrace => break,
|
|
Newline | Semicolon => {
|
|
self.next();
|
|
continue;
|
|
},
|
|
_ => body.push(self.statement()?),
|
|
}
|
|
}
|
|
expect!(self, RCurlyBrace);
|
|
Ok(Expression(ExpressionType::Lambda { params, body }, None)) //TODO need to handle types somehow
|
|
});
|
|
|
|
parse_method!(paren_expr(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
let old_struct_value = self.restrictions.no_struct_literal;
|
|
self.restrictions.no_struct_literal = false;
|
|
let output = {
|
|
let mut inner = delimited!(self, LParen, expression, Comma, RParen);
|
|
match inner.len() {
|
|
0 => Ok(Expression(TupleLiteral(vec![]), None)),
|
|
1 => Ok(inner.pop().unwrap()),
|
|
_ => Ok(Expression(TupleLiteral(inner), None)),
|
|
}
|
|
};
|
|
self.restrictions.no_struct_literal = old_struct_value;
|
|
output
|
|
});
|
|
|
|
parse_method!(identifier_expr(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
let identifier = self.identifier()?;
|
|
Ok(match self.peek() {
|
|
LCurlyBrace if !self.restrictions.no_struct_literal => {
|
|
let fields = self.record_block()?;
|
|
Expression(NamedStruct { name: identifier, fields }, None)
|
|
},
|
|
_ => Expression(Value(identifier), None)
|
|
})
|
|
});
|
|
|
|
parse_method!(record_block(&mut self) -> ParseResult<Vec<(Rc<String>, Expression)>> {
|
|
Ok(delimited!(self, LCurlyBrace, record_entry, Comma, RCurlyBrace))
|
|
});
|
|
|
|
parse_method!(record_entry(&mut self) -> ParseResult<(Rc<String>, Expression)> {
|
|
let field_name = self.identifier()?;
|
|
expect!(self, Colon);
|
|
let value = self.expression()?;
|
|
Ok((field_name, value))
|
|
});
|
|
|
|
parse_method!(if_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::If));
|
|
let condition = {
|
|
self.restrictions.no_struct_literal = true;
|
|
let x = self.expression();
|
|
self.restrictions.no_struct_literal = false;
|
|
x?
|
|
};
|
|
let then_clause = self.block()?;
|
|
let else_clause = self.else_clause()?;
|
|
Ok(Expression(ExpressionType::IfExpression(bx!(condition), then_clause, else_clause), None))
|
|
});
|
|
|
|
parse_method!(else_clause(&mut self) -> ParseResult<Option<Block>> {
|
|
Ok(if let Keyword(Kw::Else) = self.peek() {
|
|
self.next();
|
|
Some(self.block()?)
|
|
} else {
|
|
None
|
|
})
|
|
});
|
|
|
|
parse_method!(block(&mut self) -> ParseResult<Block> {
|
|
Ok(delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict))
|
|
});
|
|
|
|
/*
|
|
parse_method!(match_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::Match));
|
|
let expr = {
|
|
self.restrictions.no_struct_literal = true;
|
|
let x = self.expression();
|
|
self.restrictions.no_struct_literal = false;
|
|
x?
|
|
};
|
|
let body = self.match_body()?;
|
|
Ok(Expression(ExpressionType::MatchExpression(bx!(expr), body), None))
|
|
});
|
|
|
|
parse_method!(match_body(&mut self) -> ParseResult<Vec<MatchArm>> {
|
|
Ok(delimited!(self, LCurlyBrace, match_arm, Comma, RCurlyBrace))
|
|
});
|
|
|
|
parse_method!(match_arm(&mut self) -> ParseResult<MatchArm> {
|
|
let pat = self.pattern()?;
|
|
expect!(self, Operator(ref c) if **c == "=>");
|
|
let expr = self.expression()?;
|
|
Ok(MatchArm { pat, expr })
|
|
});
|
|
|
|
parse_method!(pattern(&mut self) -> ParseResult<Pattern> {
|
|
let identifier = self.identifier()?;
|
|
Ok(Pattern(identifier))
|
|
});
|
|
*/
|
|
|
|
parse_method!(while_expr(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
expect!(self, Keyword(Kw::While));
|
|
let condition = {
|
|
self.restrictions.no_struct_literal = true;
|
|
let x = self.while_cond();
|
|
self.restrictions.no_struct_literal = false;
|
|
x?.map(|expr| bx!(expr))
|
|
};
|
|
let body = self.block()?;
|
|
Ok(Expression(WhileExpression {condition, body}, None))
|
|
});
|
|
|
|
parse_method!(while_cond(&mut self) -> ParseResult<Option<Expression>> {
|
|
Ok(match self.peek() {
|
|
LCurlyBrace => None,
|
|
_ => Some(self.expression()?),
|
|
})
|
|
});
|
|
|
|
parse_method!(for_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::For));
|
|
let enumerators = if let LCurlyBrace = self.peek() {
|
|
delimited!(self, LCurlyBrace, enumerator, Comma | Newline, RCurlyBrace)
|
|
} else {
|
|
let single_enum = {
|
|
self.restrictions.no_struct_literal = true;
|
|
let s = self.enumerator();
|
|
self.restrictions.no_struct_literal = false;
|
|
s?
|
|
};
|
|
vec![single_enum]
|
|
};
|
|
let body = Box::new(self.for_expr_body()?);
|
|
Ok(Expression(ExpressionType::ForExpression { enumerators, body }, None))
|
|
});
|
|
|
|
parse_method!(enumerator(&mut self) -> ParseResult<Enumerator> {
|
|
let id = self.identifier()?;
|
|
expect!(self, Operator(ref c) if **c == "<-");
|
|
let generator = self.expression()?;
|
|
Ok(Enumerator { id, generator })
|
|
});
|
|
|
|
parse_method!(for_expr_body(&mut self) -> ParseResult<ForBody> {
|
|
use self::ForBody::*;
|
|
Ok(match self.peek() {
|
|
LCurlyBrace => {
|
|
let statements = delimited!(self, LCurlyBrace, statement, Newline | Semicolon, RCurlyBrace, nonstrict);
|
|
StatementBlock(statements)
|
|
},
|
|
Keyword(Kw::Return) => {
|
|
self.next();
|
|
MonadicReturn(self.expression()?)
|
|
},
|
|
_ => return ParseError::new("for expressions must end in a block or 'return'"),
|
|
})
|
|
});
|
|
|
|
parse_method!(identifier(&mut self) -> ParseResult<Rc<String>> {
|
|
match self.next() {
|
|
Identifier(s) => Ok(s),
|
|
p => ParseError::new(&format!("Expected an identifier, got {:?}", p)),
|
|
}
|
|
});
|
|
|
|
parse_method!(literal(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
match self.peek() {
|
|
DigitGroup(_) | HexLiteral(_) | BinNumberSigil | Period => self.number_literal(),
|
|
Keyword(Kw::True) => {
|
|
self.next();
|
|
Ok(Expression(BoolLiteral(true), None))
|
|
},
|
|
Keyword(Kw::False) => {
|
|
self.next();
|
|
Ok(Expression(BoolLiteral(false), None))
|
|
},
|
|
StrLiteral(s) => {
|
|
self.next();
|
|
Ok(Expression(StringLiteral(s), None))
|
|
}
|
|
e => ParseError::new(&format!("Expected a literal expression, got {:?}", e)),
|
|
}
|
|
});
|
|
|
|
parse_method!(number_literal(&mut self) -> ParseResult<Expression> {
|
|
match self.peek() {
|
|
HexLiteral(_) | BinNumberSigil => self.int_literal(),
|
|
_ => self.float_literal(),
|
|
}
|
|
});
|
|
|
|
parse_method!(int_literal(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
match self.next() {
|
|
BinNumberSigil => {
|
|
let digits = self.digits()?;
|
|
let n = parse_binary(digits)?;
|
|
Ok(Expression(NatLiteral(n), None))
|
|
},
|
|
HexLiteral(text) => {
|
|
let digits: String = text.chars().filter(|c| c.is_digit(16)).collect();
|
|
let n = parse_hex(digits)?;
|
|
Ok(Expression(NatLiteral(n), None))
|
|
},
|
|
_ => return ParseError::new("Expected '0x' or '0b'"),
|
|
}
|
|
});
|
|
|
|
parse_method!(float_literal(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
let mut digits = self.digits()?;
|
|
if let TokenType::Period = self.peek() {
|
|
self.next();
|
|
digits.push_str(".");
|
|
digits.push_str(&self.digits()?);
|
|
match digits.parse::<f64>() {
|
|
Ok(f) => Ok(Expression(FloatLiteral(f), None)),
|
|
Err(e) => ParseError::new(&format!("Float failed to parse with error: {}", e)),
|
|
|
|
}
|
|
} else {
|
|
match digits.parse::<u64>() {
|
|
Ok(d) => Ok(Expression(NatLiteral(d), None)),
|
|
Err(e) => ParseError::new(&format!("Integer failed to parse with error: {}", e)),
|
|
}
|
|
}
|
|
});
|
|
|
|
parse_method!(digits(&mut self) -> ParseResult<String> {
|
|
let mut ds = String::new();
|
|
loop {
|
|
match self.peek() {
|
|
Underscore => { self.next(); continue; },
|
|
DigitGroup(ref s) => { self.next(); ds.push_str(s)},
|
|
_ => break,
|
|
}
|
|
}
|
|
Ok(ds)
|
|
});
|
|
}
|
|
|
|
fn parse_binary(digits: String) -> ParseResult<u64> {
|
|
let mut result: u64 = 0;
|
|
let mut multiplier = 1;
|
|
for d in digits.chars().rev() {
|
|
match d {
|
|
'1' => result += multiplier,
|
|
'0' => (),
|
|
_ => return ParseError::new("Encountered a character not '1' or '0 while parsing a binary literal"),
|
|
}
|
|
multiplier = match multiplier.checked_mul(2) {
|
|
Some(m) => m,
|
|
None => return ParseError::new("This binary expression will overflow")
|
|
}
|
|
}
|
|
Ok(result)
|
|
}
|
|
|
|
fn parse_hex(digits: String) -> ParseResult<u64> {
|
|
let mut result: u64 = 0;
|
|
let mut multiplier: u64 = 1;
|
|
for d in digits.chars().rev() {
|
|
match d.to_digit(16) {
|
|
Some(n) => result += n as u64 * multiplier,
|
|
None => return ParseError::new("Encountered a non-hex digit in a hex literal"),
|
|
}
|
|
multiplier = match multiplier.checked_mul(16) {
|
|
Some(m) => m,
|
|
None => return ParseError::new("This hex expression will overflow")
|
|
}
|
|
}
|
|
Ok(result)
|
|
}
|
|
|
|
pub fn parse(input: Vec<Token>) -> (Result<AST, ParseError>, Vec<String>) {
|
|
let mut parser = Parser::new(input);
|
|
let ast = parser.program();
|
|
|
|
let trace = parser.parse_record.into_iter().map(|r| {
|
|
let mut indent = String::new();
|
|
for _ in 0..r.level {
|
|
indent.push(' ');
|
|
}
|
|
format!("{}Production `{}`, token: {}", indent, r.production_name, r.next_token)
|
|
}).collect();
|
|
(ast, trace)
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod parse_tests {
|
|
use ::std::rc::Rc;
|
|
use super::{AST, Expression, Statement, PrefixOp, BinOp, TypeBody, Variant, Enumerator, ForBody, parse, tokenize};
|
|
use super::Statement::*;
|
|
use super::Declaration::*;
|
|
use super::Signature;
|
|
use super::TypeName::*;
|
|
use super::TypeSingletonName;
|
|
use super::ExpressionType::*;
|
|
use super::Variant::*;
|
|
use super::ForBody::*;
|
|
|
|
macro_rules! rc {
|
|
($string:tt) => { Rc::new(stringify!($string).to_string()) }
|
|
}
|
|
macro_rules! parse_test {
|
|
($string:expr, $correct:expr) => { assert_eq!(parse(tokenize($string)).0.unwrap(), $correct) }
|
|
}
|
|
macro_rules! parse_error {
|
|
($string:expr) => { assert!(parse(tokenize($string)).0.is_err()) }
|
|
}
|
|
macro_rules! val {
|
|
($var:expr) => { Value(Rc::new($var.to_string())) }
|
|
}
|
|
macro_rules! exprstatement {
|
|
($expr_type:expr) => { Statement::ExpressionStatement(Expression($expr_type, None)) };
|
|
($expr_type:expr, $type_anno:expr) => { Statement::ExpressionStatement(Expression($expr_type, Some($type_anno))) };
|
|
}
|
|
macro_rules! ty {
|
|
($name:expr) => { Singleton(tys!($name)) }
|
|
}
|
|
macro_rules! tys {
|
|
($name:expr) => { TypeSingletonName { name: Rc::new($name.to_string()), params: vec![] } };
|
|
}
|
|
|
|
|
|
/* new style of test macros */
|
|
|
|
macro_rules! single_expr {
|
|
($exprtype:expr) => { AST(vec![Statement::ExpressionStatement(Expression($exprtype, None))]) };
|
|
($exprtype:expr, $type:expr) => { AST(vec![Statement::ExpressionStatement(Expression($exprtype, $type))]) }
|
|
}
|
|
macro_rules! ex {
|
|
($expr_type:expr) => { Expression($expr_type, None) }
|
|
}
|
|
macro_rules! binexp {
|
|
($op:expr, $lhs:expr, $rhs:expr) => { BinExp(BinOp::from_sigil($op), bx!(Expression($lhs, None)), bx!(Expression($rhs, None))) }
|
|
}
|
|
macro_rules! prefexp {
|
|
($op:expr, $lhs:expr) => { PrefixExp(PrefixOp::from_sigil($op), bx!(Expression($lhs, None))) }
|
|
}
|
|
macro_rules! exst {
|
|
($expr_type:expr) => { Statement::ExpressionStatement(Expression($expr_type, None)) };
|
|
($expr_type:expr, $type_anno:expr) => { Statement::ExpressionStatement(Expression($expr_type, Some($type_anno))) };
|
|
($op:expr, $lhs:expr, $rhs:expr) => { Statement::ExpressionStatement(ex!(binexp!($op, $lhs, $rhs))) };
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_number_literals_and_binexps() {
|
|
parse_test! { ".2", single_expr!(FloatLiteral(0.2)) };
|
|
parse_test! { "8.1", single_expr!(FloatLiteral(8.1)) };
|
|
|
|
parse_test! { "0b010", single_expr!(NatLiteral(2)) };
|
|
parse_test! { "0b0_1_0_", single_expr!(NatLiteral(2)) }
|
|
|
|
parse_test! {"0xff", single_expr!(NatLiteral(255)) };
|
|
parse_test! {"0xf_f_", single_expr!(NatLiteral(255)) };
|
|
|
|
parse_test!("0xf_f_+1", AST(vec![exprstatement!(binexp!("+", NatLiteral(255), NatLiteral(1)))]));
|
|
|
|
parse_test! {"3; 4; 4.3", AST(
|
|
vec![exprstatement!(NatLiteral(3)), exprstatement!(NatLiteral(4)),
|
|
exprstatement!(FloatLiteral(4.3))])
|
|
};
|
|
|
|
parse_test!("1 + 2 * 3", AST(vec!
|
|
[
|
|
exprstatement!(binexp!("+", NatLiteral(1), binexp!("*", NatLiteral(2), NatLiteral(3))))
|
|
]));
|
|
|
|
parse_test!("1 * 2 + 3", AST(vec!
|
|
[
|
|
exprstatement!(binexp!("+", binexp!("*", NatLiteral(1), NatLiteral(2)), NatLiteral(3)))
|
|
]));
|
|
|
|
parse_test!("1 && 2", AST(vec![exprstatement!(binexp!("&&", NatLiteral(1), NatLiteral(2)))]));
|
|
|
|
parse_test!("1 + 2 * 3 + 4", AST(vec![exprstatement!(
|
|
binexp!("+",
|
|
binexp!("+", NatLiteral(1), binexp!("*", NatLiteral(2), NatLiteral(3))),
|
|
NatLiteral(4)))]));
|
|
|
|
parse_test!("(1 + 2) * 3", AST(vec!
|
|
[exprstatement!(binexp!("*", binexp!("+", NatLiteral(1), NatLiteral(2)), NatLiteral(3)))]));
|
|
|
|
parse_test!(".1 + .2", AST(vec![exprstatement!(binexp!("+", FloatLiteral(0.1), FloatLiteral(0.2)))]));
|
|
parse_test!("1 / 2", AST(vec![exprstatement!(binexp!("/", NatLiteral(1), NatLiteral(2)))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_tuples() {
|
|
parse_test!("()", AST(vec![exprstatement!(TupleLiteral(vec![]))]));
|
|
parse_test!("(\"hella\", 34)", AST(vec![exprstatement!(
|
|
TupleLiteral(
|
|
vec![ex!(StringLiteral(rc!(hella))), ex!(NatLiteral(34))]
|
|
)
|
|
)]));
|
|
parse_test!("((1+2), \"slough\")", AST(vec![exprstatement!(TupleLiteral(vec![
|
|
ex!(binexp!("+", NatLiteral(1), NatLiteral(2))),
|
|
ex!(StringLiteral(rc!(slough))),
|
|
]))]))
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_identifiers() {
|
|
parse_test!("a", AST(vec![exprstatement!(val!("a"))]));
|
|
parse_test!("a + b", AST(vec![exprstatement!(binexp!("+", val!("a"), val!("b")))]));
|
|
//parse_test!("a[b]", AST(vec![Expression(
|
|
//parse_test!("a[]", <- TODO THIS NEEDS TO FAIL
|
|
//parse_test!(damn()[a] ,<- TODO needs to succeed
|
|
parse_test!("a[b,c]", AST(vec![exprstatement!(Index { indexee: bx!(ex!(val!("a"))), indexers: vec![ex!(val!("b")), ex!(val!("c"))]} )]));
|
|
|
|
parse_test!("None", AST(vec![exprstatement!(val!("None"))]));
|
|
parse_test!("Pandas { a: x + y }", AST(vec![
|
|
exprstatement!(NamedStruct { name: rc!(Pandas), fields: vec![(rc!(a), ex!(binexp!("+", val!("x"), val!("y"))))]})
|
|
]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_complicated_operators() {
|
|
parse_test!("a <- b", AST(vec![exprstatement!(binexp!("<-", val!("a"), val!("b")))]));
|
|
parse_test!("a || b", AST(vec![exprstatement!(binexp!("||", val!("a"), val!("b")))]));
|
|
parse_test!("a<>b", AST(vec![exprstatement!(binexp!("<>", val!("a"), val!("b")))]));
|
|
parse_test!("a.b.c.d", AST(vec![exprstatement!(binexp!(".",
|
|
binexp!(".",
|
|
binexp!(".", val!("a"), val!("b")),
|
|
val!("c")),
|
|
val!("d")))]));
|
|
parse_test!("-3", AST(vec![exprstatement!(prefexp!("-", NatLiteral(3)))]));
|
|
parse_test!("-0.2", AST(vec![exprstatement!(prefexp!("-", FloatLiteral(0.2)))]));
|
|
parse_test!("!3", AST(vec![exprstatement!(prefexp!("!", NatLiteral(3)))]));
|
|
parse_test!("a <- -b", AST(vec![exprstatement!(binexp!("<-", val!("a"), prefexp!("-", val!("b"))))]));
|
|
parse_test!("a <--b", AST(vec![exprstatement!(binexp!("<--", val!("a"), val!("b")))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_functions() {
|
|
parse_test!("fn oi()", AST(vec![Declaration(FuncSig(Signature { name: rc!(oi), params: vec![], type_anno: None }))]));
|
|
parse_test!("oi()", AST(vec![exprstatement!(Call { f: bx!(ex!(val!("oi"))), arguments: vec![] })]));
|
|
parse_test!("oi(a, 2 + 2)", AST(vec![exprstatement!(Call
|
|
{ f: bx!(ex!(val!("oi"))),
|
|
arguments: vec![ex!(val!("a")), ex!(binexp!("+", NatLiteral(2), NatLiteral(2)))]
|
|
})]));
|
|
parse_error!("a(b,,c)");
|
|
|
|
parse_test!("fn a(b, c: Int): Int", AST(vec![Declaration(
|
|
FuncSig(Signature { name: rc!(a), params: vec![
|
|
(rc!(b), None), (rc!(c), Some(ty!("Int")))
|
|
], type_anno: Some(ty!("Int")) }))]));
|
|
|
|
|
|
parse_test!("fn a(x) { x() }", AST(vec![Declaration(
|
|
FuncDecl(Signature { name: rc!(a), params: vec![(rc!(x),None)], type_anno: None },
|
|
vec![exprstatement!(Call { f: bx!(ex!(val!("x"))), arguments: vec![] })]))]));
|
|
parse_test!("fn a(x) {\n x() }", AST(vec![Declaration(
|
|
FuncDecl(Signature { name: rc!(a), params: vec![(rc!(x),None)], type_anno: None },
|
|
vec![exprstatement!(Call { f: bx!(ex!(val!("x"))), arguments: vec![] })]))]));
|
|
|
|
let multiline = r#"
|
|
fn a(x) {
|
|
x()
|
|
}
|
|
"#;
|
|
parse_test!(multiline, AST(vec![Declaration(
|
|
FuncDecl(Signature { name: rc!(a), params: vec![(rc!(x),None)], type_anno: None },
|
|
vec![exprstatement!(Call { f: bx!(ex!(val!("x"))), arguments: vec![] })]))]));
|
|
let multiline2 = r#"
|
|
fn a(x) {
|
|
|
|
x()
|
|
|
|
}
|
|
"#;
|
|
parse_test!(multiline2, AST(vec![Declaration(
|
|
FuncDecl(Signature { name: rc!(a), params: vec![(rc!(x),None)], type_anno: None },
|
|
vec![exprstatement!(Call { f: bx!(ex!(val!("x"))), arguments: vec![] })]))]));
|
|
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_bools() {
|
|
parse_test!("false", AST(vec![exprstatement!(BoolLiteral(false))]));
|
|
parse_test!("true", AST(vec![exprstatement!(BoolLiteral(true))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_strings() {
|
|
parse_test!(r#""hello""#, AST(vec![exprstatement!(StringLiteral(rc!(hello)))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_types() {
|
|
parse_test!("type Yolo = Yolo", AST(vec![Declaration(TypeDecl(tys!("Yolo"), TypeBody(vec![UnitStruct(rc!(Yolo))])))]));
|
|
parse_test!("type alias Sex = Drugs", AST(vec![Declaration(TypeAlias(rc!(Sex), rc!(Drugs)))]));
|
|
parse_test!("type Sanchez = Miguel | Alejandro(Int, Option<a>) | Esperanza { a: Int, b: String }",
|
|
AST(vec![Declaration(TypeDecl(tys!("Sanchez"), TypeBody(vec![
|
|
UnitStruct(rc!(Miguel)),
|
|
TupleStruct(rc!(Alejandro), vec![
|
|
Singleton(TypeSingletonName { name: rc!(Int), params: vec![] }),
|
|
Singleton(TypeSingletonName { name: rc!(Option), params: vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })] }),
|
|
]),
|
|
Record(rc!(Esperanza), vec![
|
|
(rc!(a), Singleton(TypeSingletonName { name: rc!(Int), params: vec![] })),
|
|
(rc!(b), Singleton(TypeSingletonName { name: rc!(String), params: vec![] })),
|
|
])])))]));
|
|
|
|
parse_test!("type Jorge<a> = Diego | Kike(a)", AST(vec![
|
|
Declaration(TypeDecl(
|
|
TypeSingletonName { name: rc!(Jorge), params: vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })] },
|
|
TypeBody(vec![UnitStruct(rc!(Diego)), TupleStruct(rc!(Kike), vec![Singleton(TypeSingletonName { name: rc!(a), params: vec![] })])]))
|
|
)]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_bindings() {
|
|
parse_test!("var a = 10", AST(vec![Declaration(Binding { name: rc!(a), constant: false, expr: ex!(NatLiteral(10)) } )]));
|
|
parse_test!("const a = 2 + 2", AST(vec![Declaration(Binding { name: rc!(a), constant: true, expr: ex!(binexp!("+", NatLiteral(2), NatLiteral(2))) }) ]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_block_expressions() {
|
|
parse_test!("if a() { b(); c() }", AST(vec![exprstatement!(
|
|
IfExpression(bx!(ex!(Call { f: bx!(ex!(val!("a"))), arguments: vec![]})),
|
|
vec![exprstatement!(Call { f: bx!(ex!(val!("b"))), arguments: vec![]}), exprstatement!(Call { f: bx!(ex!(val!("c"))), arguments: vec![] })],
|
|
None)
|
|
)]));
|
|
parse_test!(r#"
|
|
if true {
|
|
const a = 10
|
|
b
|
|
} else {
|
|
c
|
|
}"#,
|
|
AST(vec![exprstatement!(IfExpression(bx!(ex!(BoolLiteral(true))),
|
|
vec![Declaration(Binding { name: rc!(a), constant: true, expr: ex!(NatLiteral(10)) }),
|
|
exprstatement!(val!(rc!(b)))],
|
|
Some(vec![exprstatement!(val!(rc!(c)))])))])
|
|
);
|
|
|
|
parse_test!("if a { b } else { c }", AST(vec![exprstatement!(
|
|
IfExpression(bx!(ex!(val!("a"))),
|
|
vec![exprstatement!(val!("b"))],
|
|
Some(vec![exprstatement!(val!("c"))])))]));
|
|
|
|
parse_test!("if (A {a: 1}) { b } else { c }", AST(vec![exprstatement!(
|
|
IfExpression(bx!(ex!(NamedStruct { name: rc!(A), fields: vec![(rc!(a), ex!(NatLiteral(1)))]})),
|
|
vec![exprstatement!(val!("b"))],
|
|
Some(vec![exprstatement!(val!("c"))])))]));
|
|
|
|
parse_error!("if A {a: 1} { b } else { c }");
|
|
}
|
|
#[test]
|
|
fn parsing_interfaces() {
|
|
parse_test!("interface Unglueable { fn unglue(a: Glue); fn mar(): Glue }", AST(vec![
|
|
Declaration(Interface {
|
|
name: rc!(Unglueable),
|
|
signatures: vec![
|
|
Signature { name: rc!(unglue), params: vec![(rc!(a), Some(Singleton(TypeSingletonName { name: rc!(Glue), params: vec![] })))], type_anno: None },
|
|
Signature { name: rc!(mar), params: vec![], type_anno: Some(Singleton(TypeSingletonName { name: rc!(Glue), params: vec![] })) },
|
|
]
|
|
})
|
|
]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_impls() {
|
|
parse_test!("impl Heh { fn yolo(); fn swagg(); }", AST(vec![
|
|
Declaration(Impl {
|
|
type_name: ty!("Heh"),
|
|
interface_name: None,
|
|
block: vec![
|
|
FuncSig(Signature { name: rc!(yolo), params: vec![], type_anno: None }),
|
|
FuncSig(Signature { name: rc!(swagg), params: vec![], type_anno: None })
|
|
] })]));
|
|
|
|
parse_test!("impl Mondai for Lollerino { fn yolo(); fn swagg(); }", AST(vec![
|
|
Declaration(Impl {
|
|
type_name: ty!("Lollerino"),
|
|
interface_name: Some(rc!(Mondai)),
|
|
block: vec![
|
|
FuncSig(Signature { name: rc!(yolo), params: vec![], type_anno: None}),
|
|
FuncSig(Signature { name: rc!(swagg), params: vec![], type_anno: None })
|
|
] })]));
|
|
parse_test!("impl Option<WTFMate> { fn oi() }", AST(vec![
|
|
Declaration(Impl {
|
|
type_name: Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("WTFMate")]}),
|
|
interface_name: None,
|
|
block: vec![
|
|
FuncSig(Signature { name: rc!(oi), params: vec![], type_anno: None }),
|
|
]
|
|
})]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_type_annotations() {
|
|
parse_test!("const a = b : Int", AST(vec![
|
|
Declaration(Binding { name: rc!(a), constant: true, expr:
|
|
Expression(val!("b"), Some(ty!("Int"))) })]));
|
|
|
|
parse_test!("a : Int", AST(vec![
|
|
exprstatement!(val!("a"), ty!("Int"))
|
|
]));
|
|
|
|
parse_test!("a : Option<Int>", AST(vec![
|
|
exprstatement!(val!("a"), Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("Int")] }))
|
|
]));
|
|
|
|
parse_test!("a : KoreanBBQSpecifier<Kimchi, Option<Bulgogi> >", AST(vec![
|
|
exprstatement!(val!("a"), Singleton(TypeSingletonName { name: rc!(KoreanBBQSpecifier), params: vec![
|
|
ty!("Kimchi"), Singleton(TypeSingletonName { name: rc!(Option), params: vec![ty!("Bulgogi")] })
|
|
] }))
|
|
]));
|
|
|
|
parse_test!("a : (Int, Yolo<a>)", AST(vec![
|
|
exprstatement!(val!("a"), Tuple(
|
|
vec![ty!("Int"), Singleton(TypeSingletonName {
|
|
name: rc!(Yolo), params: vec![ty!("a")]
|
|
})]))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_lambdas() {
|
|
parse_test! { "{|x| x + 1}", single_expr!(
|
|
Lambda { params: vec![(rc!(x), None)], body: vec![exst!("+", val!("x"), NatLiteral(1))] }
|
|
) }
|
|
|
|
parse_test!("{ |x: Int, y| a;b;c;}", AST(vec![
|
|
exprstatement!(Lambda {
|
|
params: vec![(rc!(x), Some(ty!("Int"))), (rc!(y), None)],
|
|
body: vec![exst!(val!("a")), exst!(val!("b")), exst!(val!("c"))]
|
|
})
|
|
]));
|
|
|
|
parse_test!("{|x| y}(1)", AST(vec![
|
|
exprstatement!(Call { f: bx!(ex!(
|
|
Lambda { params: vec![(rc!(x), None)], body: vec![exprstatement!(val!("y"))] })),
|
|
arguments: vec![ex!(NatLiteral(1))] })]));
|
|
}
|
|
|
|
#[test]
|
|
fn list_literals() {
|
|
parse_test! {
|
|
"[1,2]", AST(vec![
|
|
exprstatement!(ListLiteral(vec![ex!(NatLiteral(1)), ex!(NatLiteral(2))]))])
|
|
};
|
|
}
|
|
|
|
#[test]
|
|
fn while_expr() {
|
|
parse_test! {
|
|
"while { }", AST(vec![
|
|
exprstatement!(WhileExpression { condition: None, body: vec![] })])
|
|
}
|
|
|
|
parse_test! {
|
|
"while a == b { }", AST(vec![
|
|
exprstatement!(WhileExpression { condition: Some(bx![ex![binexp!("==", val!("a"), val!("b"))]]), body: vec![] })])
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn for_expr() {
|
|
parse_test! {
|
|
"for { a <- maybeValue } return 1", AST(vec![
|
|
exprstatement!(ForExpression {
|
|
enumerators: vec![Enumerator { id: rc!(a), generator: ex!(val!("maybeValue")) }],
|
|
body: bx!(MonadicReturn(ex!(NatLiteral(1))))
|
|
})])
|
|
}
|
|
|
|
parse_test! {
|
|
"for n <- someRange { f(n); }", AST(vec![
|
|
exprstatement!(ForExpression { enumerators: vec![Enumerator { id: rc!(n), generator: ex!(val!("someRange"))}],
|
|
body: bx!(ForBody::StatementBlock(vec![exprstatement!(Call { f: bx![ex!(val!("f"))], arguments: vec![ex!(val!("n"))] })]))
|
|
})])
|
|
}
|
|
}
|
|
}
|