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extern crate modelica_parser;
use self::modelica_parser::ast::*;
pub trait TranspileJS {
fn repr_js(&self) -> Result<String, String>;
}
impl TranspileJS for ModelicaModel {
fn repr_js(&self) -> Result<String, String> {
let mut constants = vec![];
for (c, e) in self.get_constant_vars() {
if let Some(v) = e {
constants.push(format!("var {} = {};",
c, try!(v.repr_js())));
}
}
let mut binds = vec![];
let mut outputs = vec![];
for eq in self.equations.iter() {
if let Expr::Ident(ref symb) = eq.lhs {
binds.push(format!("var {} = {};",
symb,
try!(eq.rhs.repr_js())));
outputs.push(symb.to_string());
} else {
return Err("Expected an identifier on LHS (in this partial implementation)".to_string())
}
}
Ok(format!(
r#"function {slug}({args}) {{
{constants}
{binds}
return [{outputs}];
}}"#,
slug = "f",
args = self.get_free_vars().join(", "),
constants = constants.join("\n "),
binds = binds.join("\n "),
outputs = outputs.join(", ")))
}
}
impl TranspileJS for Expr {
fn repr_js(&self) -> Result<String, String> {
use modelica_parser::ast::Expr::*;
match *self {
Integer(e) => Ok(format!("{}", e)),
Float(e) => Ok(format!("{}", e)),
Boolean(true) => Ok(format!("true")),
Boolean(false) => Ok(format!("false")),
StringLiteral(ref s) => Ok(format!("\"{}\"", s)),
Ident(ref e) => Ok(format!("{}", e)),
Der(ref e) => Ok(format!("der({})", try!(e.repr_js()))),
Sign(ref e) => Ok(format!("sign({})", try!(e.repr_js()))),
MathUnaryExpr(func, ref e) => Ok(format!("{:?}({})", func, try!(e.repr_js()))),
BinExpr(op, ref l, ref r) =>
Ok(format!("({} {:?} {})",
try!(l.repr_js()),
op,
try!(r.repr_js()))),
Array(_) => Err("Array unimplemented".to_string()),
}
}
}
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