diff --git a/src/ludus/parser-new.clj b/src/ludus/parser-new.clj index 801b942..f2af225 100644 --- a/src/ludus/parser-new.clj +++ b/src/ludus/parser-new.clj @@ -13,7 +13,7 @@ (defn pass? [{status :status}] (contains? passing status)) -(defn fail? [{status :status}] (conatins? failing status)) +(defn fail? [{status :status}] (contains? failing status)) (defn data [{d :data}] d) @@ -59,7 +59,7 @@ rem-ts (remaining result) rem-ps (rest ps)] (cond - (pass? result) + (pass? result) ;result {:status :ok :type name :data [result] :token (first tokens) :remaining rem-ts} (= :err (:status result)) @@ -86,9 +86,9 @@ (:ok :quiet :group) (loop [ps (rest parsers) results (case (:status first-result) - :ok [first-result] - :quiet [] - :group (:data first-result)) + :ok [first-result] + :quiet [] + :group (:data first-result)) ts (remaining first-result)] (let [result (apply-parser (first ps) ts) res-rem (remaining result)] @@ -164,13 +164,13 @@ :token (first tokens) :remaining (remaining rest-result)}) - :quiet - (let [rest-result (apply-parser rest-parser (remaining first-result))] - {:status :quiet - :type name - :data [] - :token (first tokens) - :remaining (remaining rest-result)}) + :quiet + (let [rest-result (apply-parser rest-parser (remaining first-result))] + {:status :quiet + :type name + :data [] + :token (first tokens) + :remaining (remaining rest-result)}) (:err :none) first-result)))})) @@ -185,6 +185,14 @@ {:status :group :type name :data [] :token (first tokens) :remaining tokens} )))})) +(defn flat + ([parser] (flat (pname parser) parser)) + ([name parser] + {:name (kw+str name "-flat") + :rule (fn flat-fn [tokens] + (let [result (apply-parser parser tokens)] + (if (pass? result) (first (:data result)) result)))})) + (comment " If I'm not mistaken, the Ludus grammer requires *no* lookahead, the first token in an expression tells you what kind of expression it is: @@ -219,7 +227,7 @@ (declare expression) -(def literal (choice :literal [:nil :true :false :number :string])) +(def literal (flat (choice :literal [:nil :true :false :number :string]))) (def separator (choice :separator [:comma :newline])) @@ -257,7 +265,7 @@ (def splat (order :splat [(quiet :splat) :word])) -(def list-term (choice :list-term [splat expression])) +(def list-term (flat (choice :list-term [splat expression]))) (def list-entry (order :list-entry [(quiet (one+ separator)) list-term])) @@ -285,7 +293,7 @@ (def importt (order :import [(quiet :import) :string (quiet :as) :word])) -(def toplevel (choice :toplevel [importt expression])) +(def toplevel (flat (choice :toplevel [importt expression]))) (def script-line (order :script-line [(quiet terminator) toplevel])) @@ -293,7 +301,9 @@ (def eg (:tokens (scan/scan - "" + "1 + 2 + 3" ))) eg