Implement booleans

demo/demo.rpy

@@ -1,3 +1,3 @@
 "Bob sat on the bench."
 "Bob" "Good morning!"
-eat "potato"
+eat "potato" True

renrs/src/lib.rs

@@ -13,6 +13,7 @@ pub enum Token {
     Keyword(String),
     Str(String),
     Array(Vec<Token>),
+    Boolean(bool),
 }
 
 impl Token {
@@ -21,6 +22,7 @@ impl Token {
             Keyword(keyword) => keyword,
             Str(_) => "String",
             Array(_) => "Array",
+            Boolean(_) => "Boolean",
         }
     }
 }
@@ -30,13 +32,8 @@ use Token::*;
 // Parsed script commands
 #[derive(Debug)]
 pub enum Command {
-    Say {
-        name: Option<String>,
-        text: String,
-    },
-    Eat {
-        food: String,
-    },
+    Say { name: Option<String>, text: String },
+    Eat { food: String, politely: bool },
 }
 
 use Command::*;
@@ -45,7 +42,8 @@ use Command::*;
 fn tokenize(script: &str) -> Vec<Vec<Token>> {
     let file = RpyParser::parse(Rule::file, script)
         .expect("unsuccessful parse")
-        .next().unwrap();
+        .next()
+        .unwrap();
     // TODO: Init with capacity
     let mut lines = Vec::new();
     for line in file.into_inner() {
@@ -55,7 +53,7 @@ fn tokenize(script: &str) -> Vec<Vec<Token>> {
                 for token in line.into_inner() {
                     tokens.push(parse_pair(token));
                 }
-            },
+            }
             Rule::EOI => (),
             _ => unreachable!(),
         }
@@ -71,7 +69,7 @@ fn tokenize(script: &str) -> Vec<Vec<Token>> {
 fn parse_pair(pair: pest::iterators::Pair<Rule>) -> Token {
     let token = pair.as_rule();
     match token {
-        Rule::token => {},
+        Rule::token => {}
         _ => panic!("Not a token!"),
     };
     let contents = pair.into_inner().next().unwrap();
@@ -84,7 +82,7 @@ fn parse_pair(pair: pest::iterators::Pair<Rule>) -> Token {
                 Rule::double_quote_string_data => data.as_str().replace("\\\"", "\""),
                 _ => unreachable!(),
             })
-        },
+        }
         Rule::array => {
             let mut array = Vec::new();
             for token in contents.into_inner() {
@@ -92,6 +90,11 @@ fn parse_pair(pair: pest::iterators::Pair<Rule>) -> Token {
             }
             Token::Array(array)
         }
+        Rule::boolean => Token::Boolean(match contents.as_str() {
+            "True" => true,
+            "False" => false,
+            _ => unreachable!(),
+        }),
         Rule::keyword => Token::Keyword(contents.as_str().to_owned()),
         __ => unreachable!(),
     }
@@ -128,8 +131,12 @@ fn parse_file(file_path: PathBuf) -> Vec<Command> {
                 name: Some(name.to_owned()),
                 text: text.to_owned(),
             },
-            [Keyword(keyword), Str(food)] if keyword.eq("eat") => Eat {
+            [Keyword(keyword), Str(food), tail @ ..] if keyword.eq("eat") => Eat {
                 food: food.to_owned(),
+                politely: match tail {
+                    [Boolean(politely)] => *politely,
+                    _ => false,
+                },
             },
             _ => panic!("Unknown command {}", describe_line(&line)),
         });

renrs/src/rpy.pest

@@ -8,7 +8,7 @@ char = { !NEWLINE ~ ANY }
 // http://pest.rs/book/grammars/syntax.html#atomic
 inner = @{ char* }
 
-token = { string | array | keyword }
+token = { string | array | boolean | keyword }
 
 // KEYWORDS
 // has to be atomic for no implicit separate (spaces)
@@ -34,6 +34,9 @@ array = {
     | "[" ~ NEWLINE* ~ token ~ ("," ~ NEWLINE* ~ token)* ~ NEWLINE* ~ "]"
 }
 
+// BOOLEAN
+boolean = { "True" | "False" }
+
 // comments are a # followed by
 // any number of non-newline characters
 COMMENT = _{ "#" ~ char* }