schala/schala-lang/language/src/reduced_ast.rs

531 lines
17 KiB
Rust
Raw Normal View History

//! # Reduced AST
//! The reduced AST is a minimal AST designed to be built from the full AST after all possible
//! static checks have been done. Consequently, the AST reduction phase does very little error
//! checking itself - any errors should ideally be caught either by an earlier phase, or are
//! runtime errors that the evaluator should handle. That said, becuase it does do table lookups
//! that can in principle fail [especially at the moment with most static analysis not yet complete],
//! there is an Expr variant `ReductionError` to handle these cases.
//!
//! A design decision to make - should the ReducedAST types contain all information about
//! type/layout necessary for the evaluator to work? If so, then the evaluator should not
//! have access to the symbol table at all and ReducedAST should carry that information. If not,
//! then ReducedAST shouldn't be duplicating information that can be queried at runtime from the
//! symbol table. But I think the former might make sense since ultimately the bytecode will be
//! built from the ReducedAST.
2018-05-09 02:27:57 -07:00
use std::rc::Rc;
2019-08-12 14:10:07 -07:00
use std::str::FromStr;
2018-05-09 02:02:17 -07:00
2019-01-07 13:00:37 -08:00
use crate::ast::*;
2019-09-10 03:40:41 -07:00
use crate::symbol_table::{Symbol, SymbolSpec, SymbolTable, FullyQualifiedSymbolName};
use crate::builtin::Builtin;
2019-10-10 17:06:41 -07:00
use crate::util::deref_optional_box;
2018-05-09 02:27:57 -07:00
2018-05-09 02:49:49 -07:00
#[derive(Debug)]
2018-05-09 02:27:57 -07:00
pub struct ReducedAST(pub Vec<Stmt>);
2018-05-11 17:24:11 -07:00
#[derive(Debug, Clone)]
2018-05-09 02:27:57 -07:00
pub enum Stmt {
PreBinding {
name: Rc<String>,
func: Func,
},
2018-05-09 02:27:57 -07:00
Binding {
name: Rc<String>,
2018-05-11 02:24:38 -07:00
constant: bool,
2018-05-09 02:27:57 -07:00
expr: Expr,
},
Expr(Expr),
Noop,
2018-05-09 02:27:57 -07:00
}
2018-05-11 17:24:11 -07:00
#[derive(Debug, Clone)]
2018-05-09 02:27:57 -07:00
pub enum Expr {
2018-05-12 00:59:50 -07:00
Unit,
2018-05-09 03:04:01 -07:00
Lit(Lit),
2018-05-12 12:56:39 -07:00
Tuple(Vec<Expr>),
2018-05-09 02:27:57 -07:00
Func(Func),
2019-08-30 19:10:16 -07:00
Sym(Rc<String>),
2018-08-05 19:14:02 -07:00
Constructor {
type_name: Rc<String>,
name: Rc<String>,
tag: usize,
arity: usize, // n.b. arity here is always the value from the symbol table - if it doesn't match what it's being called with, that's an eval error, eval will handle it
},
2018-05-09 02:27:57 -07:00
Call {
f: Box<Expr>,
2018-05-09 02:27:57 -07:00
args: Vec<Expr>,
},
2018-05-12 03:51:42 -07:00
Assign {
val: Box<Expr>,
expr: Box<Expr>,
},
2018-05-12 13:51:12 -07:00
Conditional {
cond: Box<Expr>,
then_clause: Vec<Stmt>,
else_clause: Vec<Stmt>,
},
ConditionalTargetSigilValue,
CaseMatch {
2018-07-24 03:12:00 -07:00
cond: Box<Expr>,
alternatives: Vec<Alternative>
2018-07-24 03:12:00 -07:00
},
2019-08-12 11:40:16 -07:00
UnimplementedSigilValue,
ReductionError(String),
2018-05-09 02:27:57 -07:00
}
pub type BoundVars = Vec<Option<Rc<String>>>; //remember that order matters here
#[derive(Debug, Clone)]
pub struct Alternative {
pub matchable: Subpattern,
2018-08-14 21:17:43 -07:00
pub item: Vec<Stmt>,
}
2018-10-30 18:39:25 -07:00
#[derive(Debug, Clone)]
pub struct Subpattern {
pub tag: Option<usize>,
2018-10-30 18:46:06 -07:00
pub subpatterns: Vec<Option<Subpattern>>,
pub bound_vars: BoundVars,
2018-10-30 18:39:25 -07:00
pub guard: Option<Expr>,
}
2018-05-11 17:24:11 -07:00
#[derive(Debug, Clone)]
2018-05-09 02:27:57 -07:00
pub enum Lit {
2018-05-11 00:38:40 -07:00
Nat(u64),
Int(i64),
2018-05-09 17:02:10 -07:00
Float(f64),
2018-05-09 02:27:57 -07:00
Bool(bool),
StringLit(Rc<String>),
}
2018-05-11 17:24:11 -07:00
#[derive(Debug, Clone)]
2018-05-11 00:38:40 -07:00
pub enum Func {
2019-08-12 14:10:07 -07:00
BuiltIn(Builtin),
2018-05-11 00:38:40 -07:00
UserDefined {
2018-05-11 23:23:54 -07:00
name: Option<Rc<String>>,
2018-05-11 00:38:40 -07:00
params: Vec<Rc<String>>,
body: Vec<Stmt>,
}
2018-05-09 02:27:57 -07:00
}
pub fn reduce(ast: &AST, symbol_table: &SymbolTable) -> ReducedAST {
let mut reducer = Reducer { symbol_table };
reducer.ast(ast)
}
struct Reducer<'a> {
symbol_table: &'a SymbolTable
}
impl<'a> Reducer<'a> {
2019-09-11 19:06:00 -07:00
fn ast(&mut self, ast: &AST) -> ReducedAST {
2018-05-10 23:41:51 -07:00
let mut output = vec![];
2019-09-11 19:06:00 -07:00
for statement in ast.statements.iter() {
2019-09-11 01:27:52 -07:00
output.push(self.statement(statement));
2018-05-09 02:49:49 -07:00
}
2018-05-11 00:45:32 -07:00
ReducedAST(output)
2018-05-09 02:49:49 -07:00
}
fn statement(&mut self, stmt: &Statement) -> Stmt {
match &stmt.kind {
2019-09-17 02:25:11 -07:00
StatementKind::Expression(expr) => Stmt::Expr(self.expression(&expr)),
StatementKind::Declaration(decl) => self.declaration(&decl),
2019-09-21 02:30:28 -07:00
StatementKind::Import(_) => Stmt::Noop,
2019-10-22 03:15:14 -07:00
StatementKind::Module(modspec) => {
for statement in modspec.contents.iter() {
self.statement(&statement);
}
Stmt::Noop
}
2018-05-11 22:44:21 -07:00
}
}
2019-09-11 01:27:52 -07:00
fn block(&mut self, block: &Block) -> Vec<Stmt> {
block.iter().map(|stmt| self.statement(stmt)).collect()
}
2019-01-04 22:58:25 -08:00
2019-09-11 01:27:52 -07:00
fn invocation_argument(&mut self, invoc: &InvocationArgument) -> Expr {
2019-06-12 03:28:46 -07:00
use crate::ast::InvocationArgument::*;
2019-09-11 01:27:52 -07:00
match invoc {
Positional(ex) => self.expression(ex),
2019-06-12 03:28:46 -07:00
Keyword { .. } => Expr::UnimplementedSigilValue,
Ignored => Expr::UnimplementedSigilValue,
}
}
fn expression(&mut self, expr: &Expression) -> Expr {
use crate::ast::ExpressionKind::*;
2019-09-11 01:27:52 -07:00
let symbol_table = self.symbol_table;
let ref input = expr.kind;
2018-05-11 00:45:32 -07:00
match input {
2018-05-12 01:44:03 -07:00
NatLiteral(n) => Expr::Lit(Lit::Nat(*n)),
2018-05-11 23:26:02 -07:00
FloatLiteral(f) => Expr::Lit(Lit::Float(*f)),
StringLiteral(s) => Expr::Lit(Lit::StringLit(s.clone())),
BoolLiteral(b) => Expr::Lit(Lit::Bool(*b)),
2019-09-11 01:27:52 -07:00
BinExp(binop, lhs, rhs) => self.binop(binop, lhs, rhs),
PrefixExp(op, arg) => self.prefix(op, arg),
2019-08-31 23:39:01 -07:00
Value(qualified_name) => {
2019-09-20 01:57:48 -07:00
let ref id = qualified_name.id;
let ref sym_name = match symbol_table.get_fqsn_from_id(id) {
Some(fqsn) => fqsn,
2019-09-10 03:31:23 -07:00
None => return Expr::ReductionError(format!("FQSN lookup for Value {:?} failed", qualified_name)),
};
2019-09-10 03:33:28 -07:00
//TODO this probably needs to change
2019-08-31 23:39:01 -07:00
let FullyQualifiedSymbolName(ref v) = sym_name;
let name = v.last().unwrap().name.clone();
match symbol_table.lookup_by_fqsn(&sym_name) {
Some(Symbol { spec: SymbolSpec::DataConstructor { index, type_args, type_name}, .. }) => Expr::Constructor {
type_name: type_name.clone(),
name: name.clone(),
tag: index.clone(),
arity: type_args.len(),
},
_ => Expr::Sym(name.clone()),
}
},
2019-09-11 01:27:52 -07:00
Call { f, arguments } => self.reduce_call_expression(f, arguments),
TupleLiteral(exprs) => Expr::Tuple(exprs.iter().map(|e| self.expression(e)).collect()),
2019-10-10 17:06:41 -07:00
IfExpression { discriminator, body } => self.reduce_if_expression(deref_optional_box(discriminator), body),
2019-09-11 01:27:52 -07:00
Lambda { params, body, .. } => self.reduce_lambda(params, body),
NamedStruct { name, fields } => self.reduce_named_struct(name, fields),
2018-11-05 21:13:31 -08:00
Index { .. } => Expr::UnimplementedSigilValue,
WhileExpression { .. } => Expr::UnimplementedSigilValue,
ForExpression { .. } => Expr::UnimplementedSigilValue,
ListLiteral { .. } => Expr::UnimplementedSigilValue,
2018-05-11 00:45:32 -07:00
}
2018-05-10 23:41:51 -07:00
}
2019-09-11 01:27:52 -07:00
fn reduce_lambda(&mut self, params: &Vec<FormalParam>, body: &Block) -> Expr {
Expr::Func(Func::UserDefined {
name: None,
params: params.iter().map(|param| param.name.clone()).collect(),
body: self.block(body),
})
}
2018-11-05 21:13:31 -08:00
fn reduce_named_struct(&mut self, name: &QualifiedName, fields: &Vec<(Rc<String>, Expression)>) -> Expr {
2019-09-11 01:27:52 -07:00
let symbol_table = self.symbol_table;
let ref sym_name = match symbol_table.get_fqsn_from_id(&name.id) {
2019-09-11 01:27:52 -07:00
Some(fqsn) => fqsn,
None => return Expr::ReductionError(format!("FQSN lookup for name {:?} failed", name)),
2019-09-11 01:27:52 -07:00
};
2019-09-11 01:27:52 -07:00
let FullyQualifiedSymbolName(ref v) = sym_name;
let ref name = v.last().unwrap().name;
let (type_name, index, members_from_table) = match symbol_table.lookup_by_fqsn(&sym_name) {
Some(Symbol { spec: SymbolSpec::RecordConstructor { members, type_name, index }, .. }) => (type_name.clone(), index, members),
_ => return Expr::ReductionError("Not a record constructor".to_string()),
};
let arity = members_from_table.len();
let mut args: Vec<(Rc<String>, Expr)> = fields.iter()
.map(|(name, expr)| (name.clone(), self.expression(expr)))
.collect();
args.as_mut_slice()
.sort_unstable_by(|(name1, _), (name2, _)| name1.cmp(name2)); //arbitrary - sorting by alphabetical order
let args = args.into_iter().map(|(_, expr)| expr).collect();
//TODO make sure this sorting actually works
let f = box Expr::Constructor { type_name, name: name.clone(), tag: *index, arity, };
Expr::Call { f, args }
}
fn reduce_call_expression(&mut self, func: &Expression, arguments: &Vec<InvocationArgument>) -> Expr {
2019-09-11 01:27:52 -07:00
Expr::Call {
f: Box::new(self.expression(func)),
args: arguments.iter().map(|arg| self.invocation_argument(arg)).collect(),
}
}
2019-10-10 17:06:41 -07:00
fn reduce_if_expression(&mut self, discriminator: Option<&Expression>, body: &IfExpressionBody) -> Expr {
2019-09-11 01:27:52 -07:00
let symbol_table = self.symbol_table;
2019-10-10 17:06:41 -07:00
let cond = Box::new(match discriminator {
Some(expr) => self.expression(expr),
2019-10-10 17:50:20 -07:00
None => return Expr::ReductionError(format!("blank cond if-expr not supported")),
2019-09-11 01:27:52 -07:00
});
2019-10-10 17:06:41 -07:00
2019-10-10 17:50:20 -07:00
match body {
2019-10-10 17:06:41 -07:00
IfExpressionBody::SimpleConditional { then_case, else_case } => {
2019-10-10 17:50:20 -07:00
let then_clause = self.block(&then_case);
let else_clause = match else_case.as_ref() {
2019-09-11 01:27:52 -07:00
None => vec![],
2019-10-10 17:50:20 -07:00
Some(stmts) => self.block(&stmts),
2019-09-11 01:27:52 -07:00
};
Expr::Conditional { cond, then_clause, else_clause }
},
2019-10-10 17:50:20 -07:00
IfExpressionBody::SimplePatternMatch { pattern, then_case, else_case } => {
let then_clause = self.block(&then_case);
let else_clause = match else_case.as_ref() {
2019-09-11 01:27:52 -07:00
None => vec![],
2019-10-10 17:50:20 -07:00
Some(stmts) => self.block(&stmts),
2019-09-11 01:27:52 -07:00
};
2018-08-05 18:01:42 -07:00
2019-09-11 01:27:52 -07:00
let alternatives = vec![
2019-10-10 17:50:20 -07:00
pattern.to_alternative(then_clause, symbol_table),
2019-09-11 01:27:52 -07:00
Alternative {
matchable: Subpattern {
tag: None,
subpatterns: vec![],
bound_vars: vec![],
guard: None,
},
item: else_clause
2018-10-19 11:02:10 -07:00
},
2019-09-11 01:27:52 -07:00
];
Expr::CaseMatch {
cond,
alternatives,
}
},
2019-10-10 17:50:20 -07:00
IfExpressionBody::CondList(ref condition_arms) => {
2019-09-11 01:27:52 -07:00
let mut alternatives = vec![];
2019-10-10 17:50:20 -07:00
for arm in condition_arms {
match arm.condition {
Condition::Expression(ref _expr) => {
return Expr::UnimplementedSigilValue
},
2019-10-10 17:50:20 -07:00
Condition::Pattern(ref p) => {
2019-09-11 01:27:52 -07:00
let item = self.block(&arm.body);
let alt = p.to_alternative(item, symbol_table);
alternatives.push(alt);
},
2019-10-10 17:50:20 -07:00
Condition::TruncatedOp(_, _) => {
return Expr::UnimplementedSigilValue
},
Condition::Else => {
2019-09-11 01:27:52 -07:00
return Expr::UnimplementedSigilValue
}
2018-10-19 11:02:10 -07:00
}
2018-08-24 16:04:18 -07:00
}
2019-09-11 01:27:52 -07:00
Expr::CaseMatch { cond, alternatives }
2018-10-19 11:02:10 -07:00
}
2019-09-11 01:27:52 -07:00
}
}
fn binop(&mut self, binop: &BinOp, lhs: &Box<Expression>, rhs: &Box<Expression>) -> Expr {
2019-09-11 01:27:52 -07:00
let operation = Builtin::from_str(binop.sigil()).ok();
match operation {
Some(Builtin::Assignment) => Expr::Assign {
val: Box::new(self.expression(&*lhs)),
expr: Box::new(self.expression(&*rhs)),
},
Some(op) => {
let f = Box::new(Expr::Func(Func::BuiltIn(op)));
Expr::Call { f, args: vec![self.expression(&*lhs), self.expression(&*rhs)] }
},
None => {
//TODO handle a user-defined operation
Expr::UnimplementedSigilValue
}
}
}
fn prefix(&mut self, prefix: &PrefixOp, arg: &Box<Expression>) -> Expr {
2019-09-11 01:27:52 -07:00
match prefix.builtin {
Some(op) => {
let f = Box::new(Expr::Func(Func::BuiltIn(op)));
Expr::Call { f, args: vec![self.expression(arg)] }
},
None => { //TODO need this for custom prefix ops
Expr::UnimplementedSigilValue
}
}
}
fn declaration(&mut self, declaration: &Declaration) -> Stmt {
use self::Declaration::*;
match declaration {
Binding {name, constant, expr, .. } => Stmt::Binding { name: name.clone(), constant: *constant, expr: self.expression(expr) },
FuncDecl(Signature { name, params, .. }, statements) => Stmt::PreBinding {
name: name.clone(),
func: Func::UserDefined {
name: Some(name.clone()),
params: params.iter().map(|param| param.name.clone()).collect(),
body: self.block(&statements),
}
},
TypeDecl { .. } => Stmt::Noop,
2019-09-28 02:42:18 -07:00
TypeAlias{ .. } => Stmt::Noop,
2019-09-11 01:27:52 -07:00
Interface { .. } => Stmt::Noop,
Impl { .. } => Stmt::Expr(Expr::UnimplementedSigilValue),
_ => Stmt::Expr(Expr::UnimplementedSigilValue)
}
2018-07-24 03:12:00 -07:00
}
}
2019-09-11 01:27:52 -07:00
/* ig var pat
* x is SomeBigOldEnum(_, x, Some(t))
*/
2018-11-03 12:53:09 -07:00
fn handle_symbol(symbol: Option<&Symbol>, inner_patterns: &Vec<Pattern>, symbol_table: &SymbolTable) -> Subpattern {
2018-10-30 18:53:34 -07:00
use self::Pattern::*;
2018-10-30 23:36:55 -07:00
let tag = symbol.map(|symbol| match symbol.spec {
2018-10-30 18:53:34 -07:00
SymbolSpec::DataConstructor { index, .. } => index.clone(),
_ => panic!("Symbol is not a data constructor - this should've been caught in type-checking"),
2018-10-30 23:36:55 -07:00
});
2018-11-03 12:53:09 -07:00
let bound_vars = inner_patterns.iter().map(|p| match p {
2019-09-20 02:03:10 -07:00
VarOrName(qualified_name) => {
2019-09-20 01:08:00 -07:00
let fqsn = symbol_table.get_fqsn_from_id(&qualified_name.id);
let symbol_exists = fqsn.and_then(|fqsn| symbol_table.lookup_by_fqsn(&fqsn)).is_some();
2019-09-08 17:01:07 -07:00
if symbol_exists {
None
} else {
2019-09-20 01:08:00 -07:00
let QualifiedName { components, .. } = qualified_name;
2019-09-19 01:34:21 -07:00
if components.len() == 1 {
Some(components[0].clone())
2019-09-08 17:01:07 -07:00
} else {
panic!("Bad variable name in pattern");
}
}
2019-09-06 02:23:04 -07:00
},
2018-10-30 18:53:34 -07:00
_ => None,
}).collect();
2018-07-24 03:12:00 -07:00
2018-11-03 12:53:09 -07:00
let subpatterns = inner_patterns.iter().map(|p| match p {
Ignored => None,
2019-09-06 02:23:04 -07:00
VarOrName(_) => None,
2018-11-03 12:53:09 -07:00
Literal(other) => Some(other.to_subpattern(symbol_table)),
tp @ TuplePattern(_) => Some(tp.to_subpattern(symbol_table)),
ts @ TupleStruct(_, _) => Some(ts.to_subpattern(symbol_table)),
Record(..) => unimplemented!(),
}).collect();
let guard = None;
2018-10-30 18:53:34 -07:00
/*
let guard_equality_exprs: Vec<Expr> = subpatterns.iter().map(|p| match p {
Literal(lit) => match lit {
_ => unimplemented!()
},
_ => unimplemented!()
}).collect();
*/
2018-10-30 18:53:34 -07:00
Subpattern {
2018-10-30 23:36:55 -07:00
tag,
2018-10-30 18:53:34 -07:00
subpatterns,
guard,
bound_vars,
}
}
2018-10-30 18:53:34 -07:00
impl Pattern {
fn to_alternative(&self, item: Vec<Stmt>, symbol_table: &SymbolTable) -> Alternative {
2018-11-03 12:53:09 -07:00
let s = self.to_subpattern(symbol_table);
Alternative {
matchable: Subpattern {
tag: s.tag,
subpatterns: s.subpatterns,
bound_vars: s.bound_vars,
guard: s.guard,
},
2018-11-03 12:53:09 -07:00
item
}
}
fn to_subpattern(&self, symbol_table: &SymbolTable) -> Subpattern {
2018-10-30 18:53:34 -07:00
use self::Pattern::*;
2018-08-24 16:04:18 -07:00
match self {
2019-09-20 02:03:10 -07:00
TupleStruct(QualifiedName{ components, id }, inner_patterns) => {
2019-09-20 01:44:20 -07:00
let fqsn = symbol_table.get_fqsn_from_id(&id);
match fqsn.and_then(|fqsn| symbol_table.lookup_by_fqsn(&fqsn)) {
2019-09-10 03:31:23 -07:00
Some(symbol) => handle_symbol(Some(symbol), inner_patterns, symbol_table),
None => {
2019-09-19 01:34:21 -07:00
panic!("Symbol {:?} not found", components);
2019-09-10 03:31:23 -07:00
}
}
2018-08-24 16:04:18 -07:00
},
2018-11-03 12:53:09 -07:00
TuplePattern(inner_patterns) => handle_symbol(None, inner_patterns, symbol_table),
2018-08-24 16:04:18 -07:00
Record(_name, _pairs) => {
unimplemented!()
},
2018-11-03 12:53:09 -07:00
Ignored => Subpattern { tag: None, subpatterns: vec![], guard: None, bound_vars: vec![] },
Literal(lit) => lit.to_subpattern(symbol_table),
2019-09-20 02:03:10 -07:00
VarOrName(QualifiedName { components, id }) => {
2019-09-10 03:31:23 -07:00
// if fqsn is Some, treat this as a symbol pattern. If it's None, treat it
// as a variable.
2019-09-20 01:44:20 -07:00
let fqsn = symbol_table.get_fqsn_from_id(&id);
match fqsn.and_then(|fqsn| symbol_table.lookup_by_fqsn(&fqsn)) {
2019-09-06 02:23:04 -07:00
Some(symbol) => handle_symbol(Some(symbol), &vec![], symbol_table),
2019-09-10 03:31:23 -07:00
None => {
2019-09-19 01:34:21 -07:00
let name = if components.len() == 1 {
components[0].clone()
2019-09-10 03:31:23 -07:00
} else {
panic!("check this line of code yo");
};
Subpattern {
tag: None,
subpatterns: vec![],
guard: None,
bound_vars: vec![Some(name.clone())],
}
2019-09-06 02:23:04 -07:00
}
}
},
2018-10-30 18:53:34 -07:00
}
}
}
impl PatternLiteral {
2019-09-10 03:40:41 -07:00
fn to_subpattern(&self, _symbol_table: &SymbolTable) -> Subpattern {
2018-10-30 18:53:34 -07:00
use self::PatternLiteral::*;
match self {
NumPattern { neg, num } => {
let comparison = Expr::Lit(match (neg, num) {
(false, ExpressionKind::NatLiteral(n)) => Lit::Nat(*n),
(false, ExpressionKind::FloatLiteral(f)) => Lit::Float(*f),
(true, ExpressionKind::NatLiteral(n)) => Lit::Int(-1*(*n as i64)),
(true, ExpressionKind::FloatLiteral(f)) => Lit::Float(-1.0*f),
2018-10-30 18:53:34 -07:00
_ => panic!("This should never happen")
});
let guard = Some(Expr::Call {
2019-08-12 14:10:07 -07:00
f: Box::new(Expr::Func(Func::BuiltIn(Builtin::Equality))),
2018-10-30 18:53:34 -07:00
args: vec![comparison, Expr::ConditionalTargetSigilValue],
});
Subpattern {
tag: None,
subpatterns: vec![],
guard,
bound_vars: vec![],
}
},
2018-10-31 01:45:16 -07:00
StringPattern(s) => {
let guard = Some(Expr::Call {
2019-08-12 14:10:07 -07:00
f: Box::new(Expr::Func(Func::BuiltIn(Builtin::Equality))),
2018-10-31 01:45:16 -07:00
args: vec![Expr::Lit(Lit::StringLit(s.clone())), Expr::ConditionalTargetSigilValue]
});
Subpattern {
tag: None,
subpatterns: vec![],
guard,
bound_vars: vec![],
}
},
2018-10-30 18:53:34 -07:00
BoolPattern(b) => {
let guard = Some(if *b {
Expr::ConditionalTargetSigilValue
} else {
Expr::Call {
2019-08-12 14:10:07 -07:00
f: Box::new(Expr::Func(Func::BuiltIn(Builtin::BooleanNot))),
2018-10-30 18:53:34 -07:00
args: vec![Expr::ConditionalTargetSigilValue]
}
2018-10-30 18:53:34 -07:00
});
Subpattern {
tag: None,
subpatterns: vec![],
guard,
bound_vars: vec![],
}
2018-08-24 16:04:18 -07:00
},
}
}
2018-05-09 17:02:10 -07:00
}