From 9f82aceb9fbdb42f332d68f4a423123bd0788b2c Mon Sep 17 00:00:00 2001
From: bnewbold <bnewbold@robocracy.org>
Date: Sat, 17 Dec 2016 18:34:47 -0800
Subject: refactor modelica parser into separate crate

---
 modelica-parser-lalrpop/src/parser.lalrpop | 97 ++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 modelica-parser-lalrpop/src/parser.lalrpop

(limited to 'modelica-parser-lalrpop/src/parser.lalrpop')

diff --git a/modelica-parser-lalrpop/src/parser.lalrpop b/modelica-parser-lalrpop/src/parser.lalrpop
new file mode 100644
index 0000000..cdd15b4
--- /dev/null
+++ b/modelica-parser-lalrpop/src/parser.lalrpop
@@ -0,0 +1,97 @@
+use std::str::FromStr;
+use ast::{ModelicaModel,Component, ComponentPrefix, Connection,
+    SimpleEquation, Expr, BinOperator};
+
+// This is an incomplete, non-standards-compliant, minimum-viable parser
+
+grammar;
+
+// Lexical Tokens
+
+pub identifier: String = {
+    r"[a-zA-Z_][a-zA-Z_0-9]*" => <>.to_string(),
+};
+
+string_literal: String = {
+    r#""[^"\\]*""# => <>.to_string(),
+    //<s:r#""[^"\\]*""#> => &s[1..s.len()-1],
+};
+
+pub integer: i64 = {
+    r"[+-]?\d+" => i64::from_str(<>).unwrap(),
+};
+
+pub float: f64 = {
+    r"[+-]?\d+\.\d*([eE][-+]?\d+)?" => f64::from_str(<>).unwrap(),
+};
+
+
+// Grammar
+
+pub model: ModelicaModel = {
+    "model" <n:identifier> <cd:component_declaration*> "equation" <cc:connect_clause*> <se:simple_equation*> "end" identifier ";" =>
+        ModelicaModel { name:n, components: cd, connections: cc, equations: se, extends: vec![] },
+};
+
+value_declaration: Expr = {
+    "=" <value:expr> => value
+};
+
+units_declaration: String = {
+    "(" "unit" "=" <units:string_literal> ")" => units
+};
+
+component_declaration: Component = {
+    <prefix:component_prefix?> <specifier:identifier> <name:identifier> <units:units_declaration?> <value:value_declaration?> <desc:string_literal?> ";" =>
+        Component { prefix:prefix, specifier:specifier, name:name, description:desc, value:value, units:units },
+};
+
+component_prefix: ComponentPrefix = {
+    "flow" => ComponentPrefix::Flow,
+    "stream" => ComponentPrefix::Stream,
+    "input" => ComponentPrefix::Input,
+    "output" => ComponentPrefix::Output,
+    "discrete" => ComponentPrefix::Discrete,
+    "parameter" => ComponentPrefix::Parameter,
+    "constant" => ComponentPrefix::Constant,
+};
+
+simple_equation: SimpleEquation = {
+    <lhs:expr> "=" <rhs:expr> ";" => SimpleEquation {lhs:lhs, rhs:rhs},
+};
+
+connect_clause: Connection = {
+    "connect" "(" <a:identifier> "," <b:identifier> ")" ";" =>
+        Connection { a: a.to_string(), b: b.to_string()},
+};
+
+// This weird expr/factor/term hierarchy is for binary operator precedence
+expr: Expr = {
+    <lhs:expr> "+" <rhs:factor> =>
+        Expr::BinExpr(BinOperator::Add, Box::new(lhs), Box::new(rhs)),
+    <lhs:expr> "-" <rhs:factor> =>
+        Expr::BinExpr(BinOperator::Subtract, Box::new(lhs), Box::new(rhs)),
+    factor,
+};
+
+factor: Expr = {
+    <lhs:factor> "*" <rhs:term> =>
+        Expr::BinExpr(BinOperator::Multiply, Box::new(lhs), Box::new(rhs)),
+    <lhs:factor> "/" <rhs:term> =>
+        Expr::BinExpr(BinOperator::Divide, Box::new(lhs), Box::new(rhs)),
+    <lhs:factor> "^" <rhs:term> =>
+        Expr::BinExpr(BinOperator::Divide, Box::new(lhs), Box::new(rhs)),
+    "-" <t:term> =>
+        Expr::BinExpr(BinOperator::Multiply, Box::new(Expr::Integer(-1)), Box::new(t)),
+    term,
+};
+
+term: Expr = {
+    integer => Expr::Integer(<>),
+    float => Expr::Float(<>),
+    identifier => Expr::Ident(<>),
+    "der" "(" <e:expr> ")" => Expr::Der(Box::new(e)),
+    "abs" "(" <e:expr> ")" => Expr::Abs(Box::new(e)),
+    "(" <e:expr> ")" => e,
+};
+
-- 
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