1243 lines
38 KiB
Rust
1243 lines
38 KiB
Rust
use itertools::Itertools;
|
|
use std::collections::HashMap;
|
|
use std::rc::Rc;
|
|
use std::iter::{Enumerate, Peekable};
|
|
use std::vec::IntoIter;
|
|
use std::str::Chars;
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum TokenType {
|
|
Newline, Semicolon,
|
|
|
|
LParen, RParen,
|
|
LSquareBracket, RSquareBracket,
|
|
LAngleBracket, RAngleBracket,
|
|
LCurlyBrace, RCurlyBrace,
|
|
Pipe,
|
|
|
|
Comma, Period, Colon, Underscore,
|
|
|
|
Operator(Rc<String>),
|
|
DigitGroup(Rc<String>), HexNumberSigil, BinNumberSigil,
|
|
StrLiteral(Rc<String>),
|
|
Identifier(Rc<String>),
|
|
Keyword(Kw),
|
|
|
|
EOF,
|
|
|
|
Error(String),
|
|
}
|
|
use self::TokenType::*;
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
pub enum Kw {
|
|
If, Else,
|
|
Func,
|
|
For,
|
|
Match,
|
|
Var, Const, Let, In,
|
|
Return,
|
|
Alias, Type, SelfType, SelfIdent,
|
|
Trait, Impl,
|
|
True, False
|
|
}
|
|
use self::Kw::*;
|
|
|
|
lazy_static! {
|
|
static ref KEYWORDS: HashMap<&'static str, Kw> =
|
|
hashmap! {
|
|
"if" => Kw::If,
|
|
"else" => Kw::Else,
|
|
"fn" => Kw::Func,
|
|
"for" => Kw::For,
|
|
"match" => Kw::Match,
|
|
"var" => Kw::Var,
|
|
"const" => Kw::Const,
|
|
"let" => Kw::Let,
|
|
"in" => Kw::In,
|
|
"return" => Kw::Return,
|
|
"alias" => Kw::Alias,
|
|
"type" => Kw::Type,
|
|
"Self" => Kw::SelfType,
|
|
"self" => Kw::SelfIdent,
|
|
"trait" => Kw::Trait,
|
|
"impl" => Kw::Impl,
|
|
"true" => Kw::True,
|
|
"false" => Kw::False,
|
|
};
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub struct Token {
|
|
pub token_type: TokenType,
|
|
pub offset: usize,
|
|
}
|
|
|
|
impl Token {
|
|
pub fn get_error(&self) -> Option<&String> {
|
|
match self.token_type {
|
|
TokenType::Error(ref s) => Some(s),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn is_digit(c: &char) -> bool {
|
|
c.is_digit(10)
|
|
}
|
|
|
|
const OPERATOR_CHARS: [char; 19] = ['!', '$', '%', '&', '*', '+', '-', '.', '/', ':', '<', '>', '=', '?', '@', '^', '|', '~', '`'];
|
|
fn is_operator(c: &char) -> bool {
|
|
OPERATOR_CHARS.iter().any(|x| x == c)
|
|
}
|
|
|
|
type CharIter<'a> = Peekable<Enumerate<Chars<'a>>>;
|
|
|
|
pub fn tokenize(input: &str) -> Vec<Token> {
|
|
let mut tokens: Vec<Token> = Vec::new();
|
|
let mut input: CharIter = input.chars().enumerate().peekable();
|
|
|
|
while let Some((idx, c)) = input.next() {
|
|
let cur_tok_type = match c {
|
|
'#' => {
|
|
if let Some(&(_, '{')) = input.peek() {
|
|
} else {
|
|
while let Some((_, c)) = input.next() {
|
|
if c == '\n' {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
continue;
|
|
},
|
|
c if c.is_whitespace() && c != '\n' => continue,
|
|
'\n' => Newline, ';' => Semicolon,
|
|
':' => Colon, ',' => Comma,
|
|
'(' => LParen, ')' => RParen,
|
|
'{' => LCurlyBrace, '}' => RCurlyBrace,
|
|
'[' => LSquareBracket, ']' => RSquareBracket,
|
|
'"' => handle_quote(&mut input),
|
|
c if is_digit(&c) => handle_digit(c, &mut input),
|
|
c if c.is_alphabetic() || c == '_' => handle_alphabetic(c, &mut input), //TODO I'll probably have to rewrite this if I care about types being uppercase, also type parameterization
|
|
c if is_operator(&c) => handle_operator(c, &mut input),
|
|
unknown => Error(format!("Unexpected character: {}", unknown)),
|
|
};
|
|
tokens.push(Token { token_type: cur_tok_type, offset: idx });
|
|
}
|
|
tokens
|
|
}
|
|
|
|
fn handle_digit(c: char, input: &mut CharIter) -> TokenType {
|
|
if c == '0' && input.peek().map_or(false, |&(_, c)| { c == 'x' }) {
|
|
input.next();
|
|
HexNumberSigil
|
|
} else if c == '0' && input.peek().map_or(false, |&(_, c)| { c == 'b' }) {
|
|
input.next();
|
|
BinNumberSigil
|
|
} else {
|
|
let mut buf = c.to_string();
|
|
buf.extend(input.peeking_take_while(|&(_, ref c)| is_digit(c)).map(|(_, c)| { c }));
|
|
DigitGroup(Rc::new(buf))
|
|
}
|
|
}
|
|
|
|
fn handle_quote(input: &mut CharIter) -> TokenType {
|
|
let mut buf = String::new();
|
|
loop {
|
|
match input.next().map(|(_, c)| { c }) {
|
|
Some('"') => break,
|
|
Some('\\') => {
|
|
let next = input.peek().map(|&(_, c)| { c });
|
|
if next == Some('n') {
|
|
input.next();
|
|
buf.push('\n')
|
|
} else if next == Some('"') {
|
|
input.next();
|
|
buf.push('"');
|
|
} else if next == Some('t') {
|
|
input.next();
|
|
buf.push('\t');
|
|
}
|
|
},
|
|
Some(c) => buf.push(c),
|
|
None => return TokenType::Error(format!("Unclosed string")),
|
|
}
|
|
}
|
|
TokenType::StrLiteral(Rc::new(buf))
|
|
}
|
|
|
|
fn handle_alphabetic(c: char, input: &mut CharIter) -> TokenType {
|
|
let mut buf = String::new();
|
|
buf.push(c);
|
|
if c == '_' && input.peek().map(|&(_, c)| { !c.is_alphabetic() }).unwrap_or(true) {
|
|
return TokenType::Underscore
|
|
}
|
|
|
|
loop {
|
|
match input.peek().map(|&(_, c)| { c }) {
|
|
Some(c) if c.is_alphanumeric() => {
|
|
input.next();
|
|
buf.push(c);
|
|
},
|
|
_ => break,
|
|
}
|
|
}
|
|
|
|
match KEYWORDS.get(buf.as_str()) {
|
|
Some(kw) => TokenType::Keyword(kw.clone()),
|
|
None => TokenType::Identifier(Rc::new(buf)),
|
|
}
|
|
}
|
|
|
|
fn handle_operator(c: char, input: &mut CharIter) -> TokenType {
|
|
match c {
|
|
'<' | '>' | '|' | '.' => {
|
|
let ref next = input.peek().map(|&(_, c)| { c });
|
|
if !next.map(|n| { is_operator(&n) }).unwrap_or(false) {
|
|
return match c {
|
|
'<' => LAngleBracket,
|
|
'>' => RAngleBracket,
|
|
'|' => Pipe,
|
|
'.' => Period,
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
},
|
|
_ => (),
|
|
};
|
|
|
|
let mut buf = String::new();
|
|
buf.push(c);
|
|
loop {
|
|
match input.peek().map(|&(_, c)| { c }) {
|
|
Some(c) if is_operator(&c) => {
|
|
input.next();
|
|
buf.push(c);
|
|
},
|
|
_ => break
|
|
}
|
|
}
|
|
TokenType::Operator(Rc::new(buf))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod schala_tokenizer_tests {
|
|
use super::*;
|
|
|
|
macro_rules! digit { ($ident:expr) => { DigitGroup(Rc::new($ident.to_string())) } }
|
|
macro_rules! ident { ($ident:expr) => { Identifier(Rc::new($ident.to_string())) } }
|
|
macro_rules! op { ($ident:expr) => { Operator(Rc::new($ident.to_string())) } }
|
|
|
|
|
|
#[test]
|
|
fn tokens() {
|
|
let a = tokenize("let a: A<B> = c ++ d");
|
|
let token_types: Vec<TokenType> = a.into_iter().map(move |t| t.token_type).collect();
|
|
assert_eq!(token_types, vec![Keyword(Let), ident!("a"), Colon, ident!("A"),
|
|
LAngleBracket, ident!("B"), RAngleBracket, op!("="), ident!("c"), op!("++"), ident!("d")]);
|
|
}
|
|
|
|
#[test]
|
|
fn underscores() {
|
|
let token_types: Vec<TokenType> = tokenize("4_8").into_iter().map(move |t| t.token_type).collect();
|
|
assert_eq!(token_types, vec![digit!("4"), Underscore, digit!("8")]);
|
|
}
|
|
}
|
|
|
|
/* Schala EBNF Grammar */
|
|
/* Terminal productions are in 'single quotes' or UPPERCASE if they are a class
|
|
* or not representable in ASCII
|
|
|
|
program := (statement delimiter)* EOF
|
|
delimiter := NEWLINE | ';'
|
|
statement := expression | declaration
|
|
|
|
declaration := type_declaration | func_declaration | binding_declaration | impl_declaration
|
|
|
|
type_declaration := 'type' type_declaration_body
|
|
type_declaration_body := 'alias' type_alias | IDENTIFIER '=' type_body
|
|
type_alias := IDENTIFIER '=' type_name
|
|
type_body := variant_specifier ('|' variant_specifier)*
|
|
|
|
variant_specifier := IDENTIFIER | IDENTIFIER '{' typed_identifier_list '}' | IDENTIFIER '(' type_name* ')'
|
|
typed_identifier_list := typed_identifier*
|
|
typed_identifier := IDENTIFIER type_anno
|
|
|
|
func_declaration := func_signature func_body
|
|
func_body := ε | '{' (statement delimiter)* '}'
|
|
func_signature := 'fn' IDENTIFIER formal_param_list func_body
|
|
formal_param_list := '(' (formal_param ',')* ')'
|
|
formal_param := IDENTIFIER type_anno+
|
|
|
|
binding_declaration: 'var' IDENTIFIER '=' expression
|
|
| 'const' IDENTIFIER '=' expression
|
|
|
|
trait_declaration := 'trait' trait_name decl_block
|
|
impl_declaration := 'impl' IDENTIFIER decl_block | 'impl' trait_name 'for' IDENTIFIER decl_block
|
|
|
|
decl_block := '{' (func_declaration)* '}'
|
|
|
|
trait_name := IDENTIFIER
|
|
|
|
type_anno := (':' type_name)+
|
|
type_name := IDENTIFIER (type_params)* | '(' type_names ')'
|
|
type_names := ε | type_name (, type_name)*
|
|
type_params := '<' type_name (, type_name)* '>'
|
|
|
|
expression := precedence_expr type_anno+
|
|
|
|
precedence_expr := prefix_expr
|
|
prefix_expr := prefix_op primary
|
|
prefix_op := '+' | '-' | '!' | '~'
|
|
primary := literal | paren_expr | if_expr | match_expr | for_expr | identifier_expr
|
|
|
|
paren_expr := LParen paren_inner RParen
|
|
paren_inner := (expression ',')*
|
|
identifier_expr := call_expr | index_expr | IDENTIFIER
|
|
literal := 'true' | 'false' | number_literal | STR_LITERAL
|
|
|
|
if_expr := 'if' expression block else_clause
|
|
else_clause := ε | 'else' block
|
|
|
|
match_expr := 'match' expression match_body
|
|
match_body := '{' (match_arm)* '}'
|
|
match_arm := pattern '=>' expression
|
|
pattern := identifier //TODO NOT DONE
|
|
|
|
block := '{' (statement)* '}'
|
|
|
|
call_expr := IDENTIFIER '(' expr_list ')' //TODO maybe make this optional? or no, have a bare identifier meant to be used as method taken care of in eval
|
|
index_expr := '[' (expression (',' (expression)* | ε) ']'
|
|
expr_list := expression (',' expression)* | ε
|
|
|
|
for_expr := 'for' ... ????
|
|
|
|
// a float_literal can still be assigned to an int in type-checking
|
|
number_literal := int_literal | float_literal
|
|
int_literal = ('0x' | '0b') digits
|
|
float_literal := digits ('.' digits)
|
|
digits := (DIGIT_GROUP underscore)+
|
|
|
|
*/
|
|
|
|
type TokenIter = Peekable<IntoIter<Token>>;
|
|
|
|
#[derive(Debug, PartialEq)]
|
|
pub struct ParseError {
|
|
pub msg: String,
|
|
}
|
|
|
|
impl ParseError {
|
|
fn new<T>(msg: &str) -> ParseResult<T> {
|
|
Err(ParseError { msg: msg.to_string() })
|
|
}
|
|
}
|
|
|
|
pub type ParseResult<T> = Result<T, ParseError>;
|
|
|
|
#[derive(Debug)]
|
|
pub struct ParseRecord {
|
|
production_name: String,
|
|
next_token: String,
|
|
}
|
|
|
|
struct Parser {
|
|
tokens: TokenIter,
|
|
parse_record: Vec<ParseRecord>,
|
|
}
|
|
|
|
impl Parser {
|
|
fn new(input: Vec<Token>) -> Parser {
|
|
Parser { tokens: input.into_iter().peekable(), parse_record: vec![] }
|
|
}
|
|
|
|
fn peek(&mut self) -> TokenType {
|
|
self.tokens.peek().map(|ref t| { t.token_type.clone() }).unwrap_or(TokenType::EOF)
|
|
}
|
|
|
|
fn next(&mut self) -> TokenType {
|
|
self.tokens.next().map(|ref t| { t.token_type.clone() }).unwrap_or(TokenType::EOF)
|
|
}
|
|
}
|
|
|
|
macro_rules! expect {
|
|
($self:expr, $token_type:pat, $expected_item:expr) => { expect!($self, $token_type if true, $expected_item) };
|
|
($self:expr, $token_type:pat if $cond:expr, $expected_item:expr) => {
|
|
match $self.peek() {
|
|
$token_type if $cond => $self.next(),
|
|
tok => {
|
|
let msg = format!("Expected {}, got {:?}", $expected_item, tok);
|
|
return Err(ParseError { msg })
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, PartialEq)]
|
|
pub struct AST(pub Vec<Statement>);
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum Statement {
|
|
ExpressionStatement(Expression),
|
|
Declaration(Declaration),
|
|
}
|
|
|
|
type ParamName = Rc<String>;
|
|
type TraitName = Rc<String>;
|
|
type FormalParam = (ParamName, Option<TypeName>);
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum Declaration {
|
|
FuncSig(Signature),
|
|
FuncDecl(Signature, Vec<Statement>),
|
|
TypeDecl(Rc<String>, TypeBody),
|
|
TypeAlias(Rc<String>, Rc<String>),
|
|
Binding {
|
|
name: Rc<String>,
|
|
constant: bool,
|
|
expr: Expression,
|
|
},
|
|
Impl {
|
|
type_name: TypeName,
|
|
trait_name: Option<TraitName>,
|
|
block: Vec<Declaration>,
|
|
},
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct Signature {
|
|
pub name: Rc<String>,
|
|
pub params: Vec<FormalParam>,
|
|
pub type_anno: Option<TypeName>,
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct TypeBody(pub Vec<Variant>);
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum Variant {
|
|
UnitStruct(Rc<String>),
|
|
TupleStruct(Rc<String>, Vec<TypeName>),
|
|
Record(Rc<String>, Vec<(Rc<String>, TypeName)>),
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct Expression(pub ExpressionType, pub Option<TypeName>);
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum TypeName {
|
|
Tuple(Vec<TypeName>),
|
|
Singleton {
|
|
name: Rc<String>,
|
|
params: Vec<TypeName>,
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub enum ExpressionType {
|
|
IntLiteral(u64),
|
|
FloatLiteral(f64),
|
|
StringLiteral(Rc<String>),
|
|
BoolLiteral(bool),
|
|
BinExp(Operation, Box<Expression>, Box<Expression>),
|
|
PrefixExp(Operation, Box<Expression>),
|
|
TupleLiteral(Vec<Expression>),
|
|
Variable(Rc<String>),
|
|
Call {
|
|
f: Box<Expression>,
|
|
arguments: Vec<Expression>,
|
|
},
|
|
Index {
|
|
indexee: Box<Expression>,
|
|
indexers: Vec<Expression>,
|
|
},
|
|
IfExpression(Box<Expression>, Vec<Statement>, Option<Vec<Statement>>),
|
|
MatchExpression(Box<Expression>, Vec<MatchArm>),
|
|
ForExpression
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct MatchArm {
|
|
pat: Pattern,
|
|
expr: Expression,
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct Pattern(Rc<String>);
|
|
|
|
#[derive(Debug, PartialEq, Clone)]
|
|
pub struct Operation(pub Rc<String>);
|
|
|
|
impl Operation {
|
|
fn min_precedence() -> i32 {
|
|
i32::min_value()
|
|
}
|
|
|
|
fn get_precedence(op: &str) -> i32 {
|
|
match op {
|
|
"+" | "-" => 10,
|
|
"*" | "/" | "%" => 20,
|
|
_ => 30,
|
|
}
|
|
}
|
|
|
|
fn is_prefix(op: &str) -> bool {
|
|
match op {
|
|
"+" | "-" | "!" | "~" => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! parse_method {
|
|
($name:ident(&mut $self:ident) -> $type:ty $body:block) => {
|
|
fn $name(&mut $self) -> $type {
|
|
let next_token = $self.peek();
|
|
let record = ParseRecord {
|
|
production_name: stringify!($name).to_string(),
|
|
next_token: format!("{:?}", next_token),
|
|
};
|
|
$self.parse_record.push(record);
|
|
$body
|
|
}
|
|
};
|
|
}
|
|
|
|
macro_rules! delimited {
|
|
($self:expr, $start:pat, $start_str:expr, $parse_fn:ident, $( $delim:pat )|+, $end:pat, $end_str:expr, nonstrict) => {
|
|
delimited!($self, $start, $start_str, $parse_fn, $( $delim )|*, $end, $end_str, false)
|
|
};
|
|
($self:expr, $start:pat, $start_str:expr, $parse_fn:ident, $( $delim:pat )|+, $end:pat, $end_str:expr) => {
|
|
delimited!($self, $start, $start_str, $parse_fn, $( $delim )|*, $end, $end_str, true)
|
|
};
|
|
($self:expr, $start:pat, $start_str:expr, $parse_fn:ident, $( $delim:pat )|+, $end:pat, $end_str:expr, $strictness:expr) => {
|
|
{
|
|
expect!($self, $start, $start_str);
|
|
let mut acc = vec![];
|
|
loop {
|
|
let peek = $self.peek();
|
|
match peek {
|
|
$end | EOF => break,
|
|
_ => (),
|
|
}
|
|
if !$strictness {
|
|
match peek {
|
|
$( $delim )|* => { $self.next(); continue },
|
|
_ => ()
|
|
}
|
|
}
|
|
acc.push($self.$parse_fn()?);
|
|
match $self.peek() {
|
|
$( $delim )|* => { $self.next(); continue },
|
|
_ => break
|
|
};
|
|
}
|
|
expect!($self, $end, $end_str);
|
|
acc
|
|
}
|
|
};
|
|
}
|
|
|
|
impl Parser {
|
|
parse_method!(program(&mut self) -> ParseResult<AST> {
|
|
let mut statements = Vec::new();
|
|
loop {
|
|
match self.peek() {
|
|
EOF => break,
|
|
Newline | Semicolon => {
|
|
self.next();
|
|
continue;
|
|
},
|
|
_ => statements.push(self.statement()?),
|
|
}
|
|
}
|
|
Ok(AST(statements))
|
|
});
|
|
|
|
parse_method!(statement(&mut self) -> ParseResult<Statement> {
|
|
//TODO handle error recovery here
|
|
match self.peek() {
|
|
Keyword(Type) => self.type_declaration().map(|decl| { Statement::Declaration(decl) }),
|
|
Keyword(Func)=> self.func_declaration().map(|func| { Statement::Declaration(func) }),
|
|
Keyword(Var) | Keyword(Const) => self.binding_declaration().map(|decl| Statement::Declaration(decl)),
|
|
Keyword(Trait) => self.trait_declaration().map(|decl| Statement::Declaration(decl)),
|
|
Keyword(Impl) => self.impl_declaration().map(|decl| Statement::Declaration(decl)),
|
|
_ => self.expression().map(|expr| { Statement::ExpressionStatement(expr) } ),
|
|
}
|
|
});
|
|
|
|
parse_method!(type_declaration(&mut self) -> ParseResult<Declaration> {
|
|
expect!(self, Keyword(Type), "'type'");
|
|
self.type_declaration_body()
|
|
});
|
|
|
|
parse_method!(type_declaration_body(&mut self) -> ParseResult<Declaration> {
|
|
if let Keyword(Alias) = self.peek() {
|
|
self.type_alias()
|
|
} else {
|
|
let name = self.identifier()?;
|
|
expect!(self, Operator(ref c) if **c == "=", "'='");
|
|
let body = self.type_body()?;
|
|
Ok(Declaration::TypeDecl(name, body))
|
|
}
|
|
});
|
|
|
|
parse_method!(type_alias(&mut self) -> ParseResult<Declaration> {
|
|
expect!(self, Keyword(Alias), "'alias'");
|
|
let alias = self.identifier()?;
|
|
expect!(self, Operator(ref c) if **c == "=", "'='");
|
|
let original = self.identifier()?;
|
|
Ok(Declaration::TypeAlias(alias, original))
|
|
});
|
|
|
|
parse_method!(type_body(&mut self) -> ParseResult<TypeBody> {
|
|
let mut variants = Vec::new();
|
|
variants.push(self.variant_specifier()?);
|
|
loop {
|
|
if let Pipe = self.peek() {
|
|
self.next();
|
|
variants.push(self.variant_specifier()?);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
Ok(TypeBody(variants))
|
|
});
|
|
|
|
parse_method!(variant_specifier(&mut self) -> ParseResult<Variant> {
|
|
use self::Variant::*;
|
|
|
|
let name = self.identifier()?;
|
|
match self.peek() {
|
|
LParen => {
|
|
let tuple_members = delimited!(self, LParen, '(', type_name, Comma, RParen, ')');
|
|
Ok(TupleStruct(name, tuple_members))
|
|
},
|
|
LCurlyBrace => {
|
|
let typed_identifier_list = delimited!(self, LCurlyBrace, '{', typed_identifier, Comma, RCurlyBrace, '}');
|
|
Ok(Record(name, typed_identifier_list))
|
|
},
|
|
_ => Ok(UnitStruct(name))
|
|
}
|
|
});
|
|
|
|
parse_method!(typed_identifier(&mut self) -> ParseResult<(Rc<String>, TypeName)> {
|
|
let identifier = self.identifier()?;
|
|
expect!(self, Colon, "':'");
|
|
let type_name = self.type_name()?;
|
|
Ok((identifier, type_name))
|
|
});
|
|
|
|
parse_method!(func_declaration(&mut self) -> ParseResult<Declaration> {
|
|
let signature = self.signature()?;
|
|
if let LCurlyBrace = self.peek() {
|
|
let statements = delimited!(self, LCurlyBrace, '{', statement, Newline | Semicolon, RCurlyBrace, '}');
|
|
Ok(Declaration::FuncDecl(signature, statements))
|
|
} else {
|
|
Ok(Declaration::FuncSig(signature))
|
|
}
|
|
});
|
|
|
|
parse_method!(signature(&mut self) -> ParseResult<Signature> {
|
|
expect!(self, Keyword(Func), "'fn'");
|
|
let name = self.identifier()?;
|
|
let params = delimited!(self, LParen, '(', formal_param, Comma, RParen, ')');
|
|
let type_anno = match self.peek() {
|
|
Colon => Some(self.type_anno()?),
|
|
_ => None,
|
|
};
|
|
Ok(Signature { name, params, type_anno })
|
|
});
|
|
|
|
parse_method!(formal_param(&mut self) -> ParseResult<FormalParam> {
|
|
let name = self.identifier()?;
|
|
let ty = match self.peek() {
|
|
Colon => Some(self.type_anno()?),
|
|
_ => None
|
|
};
|
|
Ok((name, ty))
|
|
});
|
|
|
|
parse_method!(binding_declaration(&mut self) -> ParseResult<Declaration> {
|
|
let constant = match self.next() {
|
|
Keyword(Var) => false,
|
|
Keyword(Const) => true,
|
|
_ => return ParseError::new("Expected 'var' or 'const'"),
|
|
};
|
|
let name = self.identifier()?;
|
|
expect!(self, Operator(ref o) if **o == "=", "'='");
|
|
let expr = self.expression()?;
|
|
|
|
Ok(Declaration::Binding { name, constant, expr })
|
|
});
|
|
|
|
parse_method!(trait_declaration(&mut self) -> ParseResult<Declaration> {
|
|
unimplemented!()
|
|
});
|
|
|
|
parse_method!(impl_declaration(&mut self) -> ParseResult<Declaration> {
|
|
expect!(self, Keyword(Impl), "'impl'");
|
|
let first = self.type_name()?;
|
|
let second = if let Keyword(For) = self.peek() {
|
|
self.next();
|
|
Some(self.type_name()?)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let block = self.decl_block()?;
|
|
|
|
let result = match (first, second) {
|
|
(first, Some(second)) => {
|
|
match first {
|
|
TypeName::Singleton { ref name, ref params } if params.len() == 0 =>
|
|
Declaration::Impl { type_name: second, trait_name: Some(name.clone()), block },
|
|
_ => return ParseError::new(&format!("Invalid name for a trait")),
|
|
}
|
|
},
|
|
(first, None) => Declaration::Impl { type_name: first, trait_name: None, block }
|
|
};
|
|
Ok(result)
|
|
});
|
|
|
|
parse_method!(decl_block(&mut self) -> ParseResult<Vec<Declaration>> {
|
|
Ok(delimited!(self, LCurlyBrace, '{', func_declaration, Newline | Semicolon, RCurlyBrace, '}', nonstrict))
|
|
});
|
|
|
|
parse_method!(expression(&mut self) -> ParseResult<Expression> {
|
|
let mut expr_body = self.precedence_expr(Operation::min_precedence())?;
|
|
let type_anno = match self.peek() {
|
|
Colon => Some(self.type_anno()?),
|
|
_ => None
|
|
};
|
|
if let Some(_) = expr_body.1 {
|
|
return ParseError::new("Bad parse state");
|
|
}
|
|
expr_body.1 = type_anno;
|
|
Ok(expr_body)
|
|
});
|
|
|
|
parse_method!(type_anno(&mut self) -> ParseResult<TypeName> {
|
|
expect!(self, Colon, "':'");
|
|
self.type_name()
|
|
});
|
|
|
|
parse_method!(type_name(&mut self) -> ParseResult<TypeName> {
|
|
use self::TypeName::*;
|
|
Ok(match self.peek() {
|
|
LParen => Tuple(delimited!(self, LParen, '(', type_name, Comma, RParen, ')')),
|
|
_ => Singleton {
|
|
name: self.identifier()?,
|
|
params: match self.peek() {
|
|
LAngleBracket => delimited!(self, LAngleBracket, '<', type_name, Comma, RAngleBracket, '>'),
|
|
_ => vec![],
|
|
}
|
|
}
|
|
})
|
|
});
|
|
|
|
// this implements Pratt parsing, see http://journal.stuffwithstuff.com/2011/03/19/pratt-parsers-expression-parsing-made-easy/
|
|
fn precedence_expr(&mut self, precedence: i32) -> ParseResult<Expression> {
|
|
let next_token = self.peek();
|
|
let record = ParseRecord {
|
|
production_name: "precedence_expr".to_string(),
|
|
next_token: format!("{:?}", next_token),
|
|
};
|
|
self.parse_record.push(record);
|
|
|
|
let mut lhs = self.prefix_expr()?;
|
|
loop {
|
|
let new_precedence = match self.peek() {
|
|
Operator(op) => Operation::get_precedence(&*op),
|
|
Period => Operation::get_precedence("."),
|
|
_ => break,
|
|
};
|
|
|
|
if precedence >= new_precedence {
|
|
break;
|
|
}
|
|
let op_str = match self.next() {
|
|
Operator(op) => op,
|
|
Period => Rc::new(".".to_string()),
|
|
_ => unreachable!(),
|
|
};
|
|
let rhs = self.precedence_expr(new_precedence)?;
|
|
let operation = Operation(op_str);
|
|
lhs = Expression(ExpressionType::BinExp(operation, Box::new(lhs), Box::new(rhs)), None);
|
|
}
|
|
Ok(lhs)
|
|
}
|
|
|
|
parse_method!(prefix_expr(&mut self) -> ParseResult<Expression> {
|
|
match self.peek() {
|
|
Operator(ref op) if Operation::is_prefix(&*op) => {
|
|
let op_str = match self.next() {
|
|
Operator(op) => op,
|
|
_ => unreachable!(),
|
|
};
|
|
let expr = self.primary()?;
|
|
Ok(Expression(
|
|
ExpressionType::PrefixExp(Operation(op_str), Box::new(expr)),
|
|
None))
|
|
},
|
|
_ => self.primary()
|
|
}
|
|
});
|
|
|
|
parse_method!(primary(&mut self) -> ParseResult<Expression> {
|
|
match self.peek() {
|
|
LParen => self.paren_expr(),
|
|
Keyword(Kw::If) => self.if_expr(),
|
|
Keyword(Kw::Match) => self.match_expr(),
|
|
Keyword(Kw::For) => self.for_expr(),
|
|
Identifier(_) => self.identifier_expr(),
|
|
_ => self.literal(),
|
|
}
|
|
});
|
|
|
|
parse_method!(paren_expr(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
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)),
|
|
}
|
|
});
|
|
|
|
parse_method!(identifier_expr(&mut self) -> ParseResult<Expression> {
|
|
use self::ExpressionType::*;
|
|
let identifier = self.identifier()?;
|
|
Ok(match self.peek() {
|
|
LParen => {
|
|
let arguments = self.call_expr()?;
|
|
//TODO make this be more general
|
|
let f = Box::new(Expression(Variable(identifier), None));
|
|
Expression(Call { f, arguments }, None)
|
|
},
|
|
LSquareBracket => {
|
|
let indexers = self.index_expr()?;
|
|
Expression(Index {
|
|
indexee: Box::new(Expression(Variable(identifier), None)),
|
|
indexers,
|
|
}, None)
|
|
}
|
|
_ => Expression(Variable(identifier), None)
|
|
})
|
|
});
|
|
|
|
parse_method!(call_expr(&mut self) -> ParseResult<Vec<Expression>> {
|
|
Ok(delimited!(self, LParen, ')', expression, Comma, RParen, '('))
|
|
});
|
|
|
|
parse_method!(index_expr(&mut self) -> ParseResult<Vec<Expression>> {
|
|
Ok(delimited!(self, LSquareBracket, '[', expression, Comma, RSquareBracket, ']'))
|
|
});
|
|
|
|
parse_method!(if_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::If), "'if'");
|
|
let condition = self.expression()?;
|
|
let then_clause = self.block()?;
|
|
let else_clause = self.else_clause()?;
|
|
Ok(Expression(ExpressionType::IfExpression(Box::new(condition), then_clause, else_clause), None))
|
|
});
|
|
|
|
parse_method!(else_clause(&mut self) -> ParseResult<Option<Vec<Statement>>> {
|
|
Ok(if let Keyword(Kw::Else) = self.peek() {
|
|
self.next();
|
|
Some(self.block()?)
|
|
} else {
|
|
None
|
|
})
|
|
});
|
|
|
|
parse_method!(block(&mut self) -> ParseResult<Vec<Statement>> {
|
|
Ok(delimited!(self, LCurlyBrace, '{', statement, Newline | Semicolon, RCurlyBrace, '}', nonstrict))
|
|
});
|
|
|
|
parse_method!(match_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::Match), "'match'");
|
|
let expr = self.expression()?;
|
|
//TODO abstract these errors into the delimited macro
|
|
//expect!(self, LCurlyBrace, "Expected '{'");
|
|
let body = self.match_body()?;
|
|
//expect!(self, RCurlyBrace, "Expected '}'");
|
|
Ok(Expression(ExpressionType::MatchExpression(Box::new(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!(for_expr(&mut self) -> ParseResult<Expression> {
|
|
expect!(self, Keyword(Kw::For), "'for'");
|
|
Ok(Expression(ExpressionType::ForExpression, None))
|
|
});
|
|
|
|
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(_) | HexNumberSigil | 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() {
|
|
HexNumberSigil | 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(IntLiteral(n), None))
|
|
},
|
|
HexNumberSigil => {
|
|
ParseError::new("Not implemented")
|
|
},
|
|
_ => 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(IntLiteral(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 *= 2;
|
|
}
|
|
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| {
|
|
format!("Production `{}`, token: {:?}", r.production_name, r.next_token)
|
|
}).collect();
|
|
(ast, trace)
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod parse_tests {
|
|
use ::std::rc::Rc;
|
|
use super::{AST, Expression, Statement, Operation, TypeBody, Variant, parse, tokenize};
|
|
use super::Statement::*;
|
|
use super::Declaration::*;
|
|
use super::Signature;
|
|
use super::TypeName::*;
|
|
use super::ExpressionType::*;
|
|
use super::Variant::*;
|
|
|
|
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($string)).0.is_err()) }
|
|
}
|
|
macro_rules! binexp {
|
|
($op:expr, $lhs:expr, $rhs:expr) => { BinExp(op!($op), Box::new(Expression($lhs, None)), Box::new(Expression($rhs, None))) }
|
|
}
|
|
macro_rules! prefexp {
|
|
($op:expr, $lhs:expr) => { PrefixExp(op!($op), Box::new(Expression($lhs, None))) }
|
|
}
|
|
macro_rules! op {
|
|
($op:expr) => { Operation(Rc::new($op.to_string())) }
|
|
}
|
|
macro_rules! var {
|
|
($var:expr) => { Variable(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($type_anno))) };
|
|
}
|
|
macro_rules! ex {
|
|
($expr_type:expr) => { Expression($expr_type, None) }
|
|
}
|
|
macro_rules! ty {
|
|
($name:expr) => { Singleton { name: Rc::new($name.to_string()), params: vec![] } };
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_number_literals_and_binexps() {
|
|
parse_test!(".2", AST(vec![exprstatement!(FloatLiteral(0.2))]));
|
|
parse_test!("8.1", AST(vec![exprstatement!(FloatLiteral(8.1))]));
|
|
parse_test!("0b010", AST(vec![exprstatement!(IntLiteral(2))]));
|
|
parse_test!("3; 4; 4.3", AST(
|
|
vec![exprstatement!(IntLiteral(3)), exprstatement!(IntLiteral(4)),
|
|
exprstatement!(FloatLiteral(4.3))]));
|
|
|
|
parse_test!("1 + 2 * 3", AST(vec!
|
|
[
|
|
exprstatement!(binexp!("+", IntLiteral(1), binexp!("*", IntLiteral(2), IntLiteral(3))))
|
|
]));
|
|
|
|
parse_test!("1 * 2 + 3", AST(vec!
|
|
[
|
|
exprstatement!(binexp!("+", binexp!("*", IntLiteral(1), IntLiteral(2)), IntLiteral(3)))
|
|
]));
|
|
|
|
parse_test!("1 && 2", AST(vec![exprstatement!(binexp!("&&", IntLiteral(1), IntLiteral(2)))]));
|
|
|
|
parse_test!("1 + 2 * 3 + 4", AST(vec![exprstatement!(
|
|
binexp!("+",
|
|
binexp!("+", IntLiteral(1), binexp!("*", IntLiteral(2), IntLiteral(3))),
|
|
IntLiteral(4)))]));
|
|
|
|
parse_test!("(1 + 2) * 3", AST(vec!
|
|
[exprstatement!(binexp!("*", binexp!("+", IntLiteral(1), IntLiteral(2)), IntLiteral(3)))]));
|
|
|
|
parse_test!(".1 + .2", AST(vec![exprstatement!(binexp!("+", FloatLiteral(0.1), FloatLiteral(0.2)))]));
|
|
}
|
|
|
|
#[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!(IntLiteral(34))]
|
|
)
|
|
)]));
|
|
parse_test!("((1+2), \"slough\")", AST(vec![exprstatement!(TupleLiteral(vec![
|
|
ex!(binexp!("+", IntLiteral(1), IntLiteral(2))),
|
|
ex!(StringLiteral(rc!(slough))),
|
|
]))]))
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_identifiers() {
|
|
parse_test!("a", AST(vec![exprstatement!(var!("a"))]));
|
|
parse_test!("a + b", AST(vec![exprstatement!(binexp!("+", var!("a"), var!("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: Box::new(ex!(var!("a"))), indexers: vec![ex!(var!("b")), ex!(var!("c"))]} )]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_complicated_operators() {
|
|
parse_test!("a <- b", AST(vec![exprstatement!(binexp!("<-", var!("a"), var!("b")))]));
|
|
parse_test!("a || b", AST(vec![exprstatement!(binexp!("||", var!("a"), var!("b")))]));
|
|
parse_test!("a<>b", AST(vec![exprstatement!(binexp!("<>", var!("a"), var!("b")))]));
|
|
parse_test!("a.b.c.d", AST(vec![exprstatement!(binexp!(".",
|
|
binexp!(".",
|
|
binexp!(".", var!("a"), var!("b")),
|
|
var!("c")),
|
|
var!("d")))]));
|
|
parse_test!("-3", AST(vec![exprstatement!(prefexp!("-", IntLiteral(3)))]));
|
|
parse_test!("-0.2", AST(vec![exprstatement!(prefexp!("-", FloatLiteral(0.2)))]));
|
|
parse_test!("!3", AST(vec![exprstatement!(prefexp!("!", IntLiteral(3)))]));
|
|
parse_test!("a <- -b", AST(vec![exprstatement!(binexp!("<-", var!("a"), prefexp!("-", var!("b"))))]));
|
|
parse_test!("a <--b", AST(vec![exprstatement!(binexp!("<--", var!("a"), var!("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: Box::new(ex!(var!("oi"))), arguments: vec![] })]));
|
|
parse_test!("oi(a, 2 + 2)", AST(vec![exprstatement!(Call
|
|
{ f: Box::new(ex!(var!("oi"))),
|
|
arguments: vec![ex!(var!("a")), ex!(binexp!("+", IntLiteral(2), IntLiteral(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: Box::new(ex!(var!("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(rc!(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>) | Esparanza { a: Int, b: String }",
|
|
AST(vec![Declaration(TypeDecl(rc!(Sanchez), TypeBody(vec![
|
|
UnitStruct(rc!(Miguel)),
|
|
TupleStruct(rc!(Alejandro), vec![
|
|
Singleton { name: rc!(Int), params: vec![] },
|
|
Singleton { name: rc!(Option), params: vec![Singleton { name: rc!(a), params: vec![] }] },
|
|
]),
|
|
Record(rc!(Esparanza), vec![
|
|
(rc!(a), Singleton { name: rc!(Int), params: vec![] }),
|
|
(rc!(b), Singleton { name: rc!(String), params: vec![] }),
|
|
])])))]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_bindings() {
|
|
parse_test!("var a = 10", AST(vec![Declaration(Binding { name: rc!(a), constant: false, expr: ex!(IntLiteral(10)) } )]));
|
|
parse_test!("const a = 2 + 2", AST(vec![Declaration(Binding { name: rc!(a), constant: true, expr: ex!(binexp!("+", IntLiteral(2), IntLiteral(2))) }) ]));
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_block_expressions() {
|
|
parse_test!("if a() { b(); c() }", AST(vec![exprstatement!(
|
|
IfExpression(Box::new(ex!(Call { f: Box::new(ex!(var!("a"))), arguments: vec![]})),
|
|
vec![exprstatement!(Call { f: Box::new(ex!(var!("b"))), arguments: vec![]}), exprstatement!(Call { f: Box::new(ex!(var!("c"))), arguments: vec![] })],
|
|
None)
|
|
)]));
|
|
parse_test!(r#"
|
|
if true {
|
|
const a = 10
|
|
b
|
|
} else {
|
|
c
|
|
}"#,
|
|
AST(vec![exprstatement!(IfExpression(Box::new(ex!(BoolLiteral(true))),
|
|
vec![Declaration(Binding { name: rc!(a), constant: true, expr: ex!(IntLiteral(10)) }),
|
|
exprstatement!(Variable(rc!(b)))],
|
|
Some(vec![exprstatement!(Variable(rc!(c)))])))])
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn parsing_impls() {
|
|
parse_test!("impl Heh { fn yolo(); fn swagg(); }", AST(vec![
|
|
Declaration(Impl {
|
|
type_name: ty!("Heh"),
|
|
trait_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"),
|
|
trait_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 { name: rc!(Option), params: vec![ty!("WTFMate")]},
|
|
trait_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(var!("b"), Some(ty!("Int"))) })]));
|
|
|
|
parse_test!("a : Int", AST(vec![
|
|
exprstatement!(var!("a"), ty!("Int"))
|
|
]));
|
|
|
|
parse_test!("a : Option<Int>", AST(vec![
|
|
exprstatement!(var!("a"), Singleton { name: rc!(Option), params: vec![ty!("Int")] })
|
|
]));
|
|
|
|
parse_test!("a : KoreanBBQSpecifier<Kimchi, Option<Bulgogi> >", AST(vec![
|
|
exprstatement!(var!("a"), Singleton { name: rc!(KoreanBBQSpecifier), params: vec![
|
|
ty!("Kimchi"), Singleton { name: rc!(Option), params: vec![ty!("Bulgogi")] }
|
|
] })
|
|
]));
|
|
|
|
parse_test!("a : (Int, Yolo<a>)", AST(vec![
|
|
exprstatement!(var!("a"), Tuple(
|
|
vec![ty!("Int"), Singleton {
|
|
name: rc!(Yolo), params: vec![ty!("a")]
|
|
}]))]));
|
|
}
|
|
}
|