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Add alias and external

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This commit is contained in:
JT 2021-07-08 19:20:01 +12:00
parent eac02b55f6
commit 7b51c5c49f
2 changed files with 44 additions and 18 deletions
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10
src/main.rs
View file

@ -32,6 +32,16 @@ fn main() -> std::io::Result<()> {
);
working_set.add_decl((b"let").to_vec(), sig);
let sig = Signature::build("alias")
.required("var_name", SyntaxShape::Variable, "variable name")
.required("=", SyntaxShape::Literal(b"=".to_vec()), "equals sign")
.required(
"value",
SyntaxShape::Expression,
"the value to set the variable to",
);
working_set.add_decl((b"alias").to_vec(), sig);
//let file = std::fs::read(&path)?;
//let (output, err) = working_set.parse_file(&path, file);
let (output, err) = working_set.parse_source(path.as_bytes());

52
src/parser.rs
View file

@ -119,6 +119,7 @@ pub enum Expr {
Int(i64),
Var(VarId),
Call(Box<Call>),
ExternalCall(Vec<u8>, Vec<Vec<u8>>),
Operator(Operator),
BinaryOp(Box<Expression>, Box<Expression>, Box<Expression>), //lhs, op, rhs
Subexpression(Box<Block>),
@ -300,7 +301,18 @@ fn span(spans: &[Span]) -> Span {
impl ParserWorkingSet {
pub fn parse_external_call(&mut self, spans: &[Span]) -> (Expression, Option<ParseError>) {
// TODO: add external parsing
(Expression::garbage(spans[0]), None)
let mut args = vec![];
let name = self.get_span_contents(spans[0]).to_vec();
for span in &spans[1..] {
args.push(self.get_span_contents(*span).to_vec());
}
(
Expression {
expr: Expr::ExternalCall(name, args),
span: span(spans),
},
None,
)
}
pub fn parse_internal_call(
@ -1143,24 +1155,28 @@ impl ParserWorkingSet {
}
pub fn parse_let(&mut self, spans: &[Span]) -> (Statement, Option<ParseError>) {
if let Some(decl_id) = self.find_decl(b"let") {
let (mut call, call_span, err) = self.parse_internal_call(spans, decl_id);
let name = self.get_span_contents(spans[0]);
if err.is_some() {
return (
Statement::Expression(Expression {
expr: Expr::Call(call),
span: call_span,
}),
err,
);
} else if let Expression {
expr: Expr::Var(var_id),
..
} = call.positional[0]
{
let expression = call.positional.swap_remove(2);
return (Statement::VarDecl(VarDecl { var_id, expression }), None);
if name == b"let" {
if let Some(decl_id) = self.find_decl(b"let") {
let (mut call, call_span, err) = self.parse_internal_call(spans, decl_id);
if err.is_some() {
return (
Statement::Expression(Expression {
expr: Expr::Call(call),
span: call_span,
}),
err,
);
} else if let Expression {
expr: Expr::Var(var_id),
..
} = call.positional[0]
{
let expression = call.positional.swap_remove(2);
return (Statement::VarDecl(VarDecl { var_id, expression }), None);
}
}
}
(