diff options
| -rw-r--r-- | grammar.txt | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/grammar.txt b/grammar.txt index 0a7a66e..fe6b235 100644 --- a/grammar.txt +++ b/grammar.txt @@ -1,8 +1,12 @@ start-symbol PROGRAM context-free syntax - PROGRAM ::= "begin" DECLS "|" (STATEMENT ";")* "end" - DECLS ::= "declare" (ID ",")* + PROGRAM ::= "begin" DECLS "|" STATEMENTS "end" + DECLS ::= "declare" IDLIST + STATEMENTS ::= STATEMENT ";" + STATEMENTS ::= + IDLIST ::= ID "," + IDLIST ::= context-free syntax STATEMENT ::= ID ":=" EXP @@ -16,13 +20,20 @@ context-free syntax EXP ::= "(" EXP ")" lexical syntax - ID ::= [a-z][a-z0-9]* + ID ::= [a-z] ID' + ID' ::= [a-z0-9] ID' + ID' ::= lexical syntax - NAT ::= [0] | [1-9][0-9]* + NAT ::= [0] + NAT ::= [1-9] NAT' + NAT' ::= [0-9] NAT' + NAT' ::= lexical syntax - LAYOUT ::= [\ \n]* + LAYOUT ::= " " LAYOUT + LAYOUT ::= "\n" LAYOUT + LAYOUT ::= context-free priorities EXP ::= "-" EXP > |