--- /dev/null
+%{
+ open Printf
+%}
+
+/* Declarations */
+%token AND
+%token ARRAY
+%token ASSIGN
+%token BREAK
+%token COLON
+%token COMMA
+%token DIVIDE
+%token DO
+%token DOT
+%token ELSE
+%token END
+%token EOF
+%token EQ
+%token FOR
+%token FUNCTION
+%token GE
+%token GT
+%token <string> ID
+%token IF
+%token IN
+%token <int> INT
+%token LBRACE
+%token LBRACK
+%token LE
+%token LET
+%token LPAREN
+%token LT
+%token MINUS
+%token NEQ
+%token NIL
+%token OF
+%token OR
+%token PLUS
+%token RBRACE
+%token RBRACK
+%token RPAREN
+%token SEMICOLON
+%token <string> STRING
+%token THEN
+%token TIMES
+%token TO
+%token TYPE
+%token VAR
+%token WHILE
+
+/* from lowest precedence */
+%left OR
+%left AND
+%nonassoc EQ NEQ GT LT GE LE
+%left PLUS MINUS
+%left TIMES DIVIDE
+%nonassoc UMINUS
+/* to highest precedence */
+
+%type <string> program
+
+%start program
+
+%%
+
+program:
+ | exp EOF
+ {
+ sprintf "program[%s]" $1
+ }
+
+exp:
+ | NIL
+ {
+ "nil[]"
+ }
+ | INT
+ {
+ sprintf "int[%d]" $1
+ }
+ | MINUS exp %prec UMINUS
+ {
+ sprintf "negation[%s]" $2
+ }
+ | type_id LBRACK exp RBRACK OF exp
+ {
+ sprintf "array[type[%s], size[%s], val[%s]]" $1 $3 $6
+ }
+ | type_id LBRACE rec_field_assignments RBRACE
+ {
+ sprintf "record[type[%s], rec_field_assignments[%s]]" $1 $3
+ }
+ | lvalue
+ {
+ $1
+ }
+ | lvalue ASSIGN exp
+ {
+ sprintf "assign[%s := %s]" $1 $3
+ }
+ | STRING
+ {
+ sprintf "string[%S]" $1
+ }
+ | fun_call
+ {
+ $1
+ }
+ | exp op exp
+ {
+ sprintf "op[%s %s %s]" $1 $2 $3
+ }
+ | IF exp THEN exp ELSE exp
+ {
+ let e1 = $2 in
+ let e2 = $4 in
+ let e3 = $6 in
+ sprintf "if_then_else[%s, then[%s], else[%s]]" e1 e2 e3
+ }
+ | IF exp THEN exp
+ {
+ sprintf "if_then[%s, then[%s]]" $2 $4
+ }
+ | WHILE exp DO exp
+ {
+ sprintf "while[%s, do[%s]]" $2 $4
+ }
+ | FOR id ASSIGN exp TO exp DO exp
+ {
+ let id = $2 in
+ let e1 = $4 in
+ let e2 = $6 in
+ let e3 = $8 in
+ sprintf "for[%s := %s, to[%s], do[%s]]" id e1 e2 e3
+ }
+ | BREAK
+ {
+ "break[]"
+ }
+ | LPAREN seq RPAREN
+ {
+ sprintf "seq[%s]" $2
+ }
+ | LET decs IN seq END
+ {
+ let decs = $2 in
+ let seq = $4 in
+ sprintf "let[decs[%s], in[seq[%s]]]" decs seq
+ }
+ | unit
+ {
+ $1
+ }
+
+seq:
+ | exp
+ {
+ sprintf "%s" $1
+ }
+ | exp SEMICOLON seq
+ {
+ sprintf "%s; %s" $1 $3
+ }
+
+decs:
+ | dec
+ {
+ sprintf "%s" $1
+ }
+ | dec decs
+ {
+ sprintf "%s %s" $1 $2
+ }
+
+dec:
+ | tydec {$1}
+ | vardec {$1}
+ | fundec {$1}
+
+fundec:
+ | FUNCTION id LPAREN tyfields RPAREN EQ exp
+ {
+ let id = $2 in
+ let tyfields = $4 in
+ let exp = $7 in
+ sprintf "fundec[%s, tyfields[%s], exp[%s]]" id tyfields exp
+ }
+ | FUNCTION id LPAREN tyfields RPAREN COLON type_id EQ exp
+ {
+ let id = $2 in
+ let tyfields = $4 in
+ let type_id = $7 in
+ let exp = $9 in
+ sprintf
+ "fundec[%s, tyfields[%s], type_id[%s], exp[%s]]"
+ id tyfields type_id exp
+ }
+
+vardec:
+ | VAR id ASSIGN exp
+ {
+ let id = $2 in
+ let exp = $4 in
+ sprintf "vardec[%s, exp[%s]]" id exp
+ }
+ | VAR id COLON type_id ASSIGN exp
+ {
+ let id = $2 in
+ let tyid = $4 in
+ let exp = $6 in
+ sprintf "vardec[%s, type_id[%s], exp[%s]]" id tyid exp
+ }
+
+tydec:
+ | TYPE type_id EQ ty
+ {
+ sprintf "tydec[%s, %s]" $2 $4
+ }
+
+ty:
+ | type_id
+ {$1}
+ | LBRACE RBRACE
+ {
+ "record[]"
+ }
+ | LBRACE tyfields RBRACE
+ {
+ let tyfields = $2 in
+ sprintf "record[%s]" tyfields
+ }
+ | ARRAY OF type_id
+ {
+ let type_id = $3 in
+ sprintf "array_of_type[%s]" type_id
+ }
+
+tyfields:
+/*| epsilon */
+ | tyfield
+ {$1}
+ | tyfield COMMA tyfields
+ {
+ let tyfield = $1 in
+ let tyfields = $3 in
+ sprintf "%s, %s" tyfield tyfields
+ }
+
+tyfield:
+ | id COLON type_id
+ {
+ let id = $1 in
+ let type_id = $3 in
+ sprintf "tyfield[%s, %s]" id type_id
+ }
+
+id:
+ | ID
+ {
+ sprintf "id[%S]" $1
+ }
+
+/* Perhaps "void"? */
+unit:
+ | LPAREN RPAREN
+ {
+ "unit[]"
+ }
+
+type_id:
+ | id
+ {
+ sprintf "type_id[%S]" $1
+ }
+
+rec_field_assignments:
+ | id EQ exp
+ {
+ sprintf "%S = %s" $1 $3
+ }
+ | id EQ exp COMMA rec_field_assignments
+ {
+ sprintf "%S = %s, %s" $1 $3 $5
+ }
+
+fun_call:
+ | id unit
+ {
+ sprintf "fun_call[%s, %s]" $1 $2
+ }
+ | id LPAREN fun_args RPAREN
+ {
+ sprintf "fun_call[%s, %s]" $1 $3
+ }
+
+fun_args:
+ | exp
+ {
+ $1
+ }
+ | exp COMMA fun_args
+ {
+ sprintf "%s, %s" $1 $3
+ }
+
+op:
+ | PLUS {"+"}
+ | MINUS {"-"}
+ | TIMES {"*"}
+ | DIVIDE {"/"}
+ | EQ {"="}
+ | NEQ {"<>"}
+ | GT {">"}
+ | LT {"<"}
+ | GE {">="}
+ | LE {"<="}
+ | AND {"&"}
+ | OR {"|"}
+
+lvalue:
+ | id
+ {
+ sprintf "lvalue[%s]" $1
+ }
+ | lvalue DOT id
+ {
+ sprintf "get_record_field[%s, %s]" $1 $3
+ }
+ | lvalue LBRACK exp RBRACK
+ {
+ sprintf "get_array_subscript[%s, %s]" $1 $3
+ }
+
+%%
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