~stream languageHEADmaster

1 files changed, 33 insertions, 0 deletions

diff --git a/query/Query.g4 b/query/Query.g4
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+++ b/query/Query.g4
@@ -0,0 +1,33 @@
+
+grammar Query;
+
+prog:   stat+ EOF? ;
+
+stat:   expr                # rawExpr
+    |   ID '=' expr         # assign
+    ;
+
+expr:   expr '.' ID                                 # access
+    |   expr '(' (args=expr*) ')'                   # call
+    |   expr op=('*'|'/') expr                      # MulDiv
+    |   expr op=('+'|'-') expr                      # AddSub
+    |   INT                                         # int
+    |   STRINGLITERAL                               # string
+    |   ID                                          # id
+    |   '(' expr ')'                                # parens
+    |   '{' (args=arguments)? prog '}'              # func
+    ;
+
+arguments: ID (',' ID)* '->';
+
+STRINGLITERAL : '"' ( StringEscapeSeq | ~( '\\' | '"' | '\r' | '\n' ) )* '"' ;
+StringEscapeSeq : '\\' ( 't' | 'n' | 'r' | '"' | '\\' | '$' | ('0'..'9')) ;
+
+MUL :   '*' ; // assigns token name to '*' used above in grammar
+DIV :   '/' ;
+ADD :   '+' ;
+SUB :   '-' ;
+ID  :   [a-zA-Z]+ ;      // match identifiers
+INT :   [0-9]+ ;         // match integers
+NEWLINE:'\r'? '\n' -> skip ;     // return newlines to parser (is end-statement signal)
+WS : [ \t]+ -> skip ; // toss out whitespace
\ No newline at end of file