Add include statement

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/parser.pest

@@ -19,6 +19,7 @@ assign = { ":" ~ word }
 atom = { float | int | assign | word | str | apply }
 quote = { "[" ~ stmt* ~ "]" }
 expr = { atom | quote }
-stmt = { expr }
+include = { "%include" ~ str }
+stmt = { include | expr }
 
 file = { SOI ~ stmt* ~ EOI }

src/syn/peg.rs

@@ -95,6 +95,7 @@ fn parse_stmt(source: &Rc<String>, pair: Pair<Rule>) -> Result<SpStmt> {
     let pair_span = pair.as_span();
     let stmt = match pair.as_rule() {
         Rule::expr => Stmt::Expr(parse_expr(source, pair.into_inner().next().unwrap())?),
+        Rule::include => Stmt::Include(unescape_string(pair.into_inner().next().unwrap().as_str())),
         rule => unreachable!("{:?}", rule),
     };
     let span = Span {