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|
%start <Xi_lib.Ast.module_definition> file
%{
open Xi_lib
open Ast
open Parser_utils
let mkTag =
let i = ref 0 in
fun () ->
let tag = !i in
incr i;
NodeTag tag
%}
%token EOF
%token COMMA
%token SEMICOLON
%token LPAREN
%token RPAREN
%token LBRACKET
%token RBRACKET
%token LSBRACKET
%token RSBRACKET
%token COLON
%token OP_PLUS
%token OP_MINUS
%token OP_MULT
%token OP_DIV
%token OP_REM
%token OP_AND
%token OP_OR
%token OP_EQ
%token OP_NEQ
%token OP_LE
%token OP_GE
%token OP_LT
%token OP_GT
%token OP_NOT
%token ASSIGN
%token IF
%token ELSE
%token WHILE
%token RETURN
%token LENGTH
%token <int>INT
%token <string>IDENTIFIER
%token <string>STRING
%token <char>CHAR
%token <bool>BOOL
%token UNDERSCORE
%token T_BOOL
%token T_INT
%%
file:
| declarations= list(func) EOF
{ ModuleDefinition {global_declarations=declarations } }
func:
| id=identifier LPAREN parameters=separated_list(COMMA,var_decl) RPAREN return=return_type body=option(statement_block)
{ GDECL_Function { loc=mkLocation $startpos;
id=id;formal_parameters=parameters; return_types=return;body=body} }
var_decl:
| id = identifier COLON t=typ
{ VarDecl {loc=mkLocation $startpos;id=id;tp=t} }
option_var_decl:
| decl=var_decl { Some decl }
| UNDERSCORE { None }
return_type:
| return = option(preceded(COLON,separated_list(COMMA,typ) ) )
{ match return with
| None -> []
| Some l -> l
}
typ:
| t=base_type { t }
| t=typ LSBRACKET dim=option(expression) RSBRACKET
{ TEXPR_Array { loc=mkLocation $startpos;
sub=t;dim=dim } }
base_type:
| T_INT {TEXPR_Int {loc=mkLocation $startpos} }
| T_BOOL {TEXPR_Bool {loc=mkLocation $startpos} }
op_unary:
| OP_MINUS { UNOP_Neg }
| OP_NOT { UNOP_Not }
op_mult_prec:
| OP_MULT {BINOP_Mult}
| OP_DIV {BINOP_Div}
| OP_REM {BINOP_Rem}
op_add_prec:
| OP_PLUS {BINOP_Add}
| OP_MINUS {BINOP_Sub}
op_cmp_prec:
| OP_LE {RELOP_Le}
| OP_LT {RELOP_Lt}
| OP_GE {RELOP_Ge}
| OP_GT {RELOP_Gt}
op_eq_prec:
| OP_EQ {RELOP_Eq}
| OP_NEQ {RELOP_Ne}
expression:
| node=expression_or {node}
expression_or:
| node=expression_and {node}
| left=expression_or OP_OR right=expression_and
{EXPR_Binop {tag=mkTag ();loc=mkLocation $startpos;
op=BINOP_Or;lhs=left;rhs=right } }
expression_and:
| node=expression_eq {node}
| left=expression_and OP_AND right=expression_eq
{EXPR_Binop {tag=mkTag ();loc=mkLocation $startpos;
op=BINOP_And;lhs=left;rhs=right } }
expression_eq:
| node=expression_cmp {node}
| left=expression_eq op=op_eq_prec right=expression_cmp
{EXPR_Relation {tag=mkTag ();loc=mkLocation $startpos;
op=op;lhs=left;rhs=right } }
expression_cmp:
| node=expression_add {node}
| left=expression_cmp op=op_cmp_prec right=expression_add
{EXPR_Relation {tag=mkTag ();loc=mkLocation $startpos;
op=op;lhs=left;rhs=right } }
expression_add:
| node=expression_mult { node }
| left=expression_add op=op_add_prec right=expression_mult
{EXPR_Binop {tag=mkTag ();loc=mkLocation $startpos;
op=op;lhs=left;rhs=right } }
expression_mult:
| node=expression_unary { node }
| left=expression_mult op=op_mult_prec right=expression_unary
{EXPR_Binop {tag=mkTag ();loc=mkLocation $startpos;
op=op;lhs=left;rhs=right } }
expression_unary:
| node=expression_highest_prec { node }
| op=op_unary right=expression_unary
{EXPR_Unop {tag=mkTag ();loc=mkLocation $startpos;
op=op;sub=right } }
expression_highest_prec:
| node=expression_base { node }
| node=expression_call { node }
| node=expression_length { node }
| node=expression_index { node }
expression_base:
| node=expression_identifier { node }
| node=expression_integer { node }
| node=expression_char { node }
| node=expression_string { node }
| node=expression_bool { node }
| node=expression_struct { node }
| LPAREN node=expression RPAREN { node }
expression_index:
| sub=expression_base index=delimited(LSBRACKET,expression,RSBRACKET)
{ EXPR_Index {tag=mkTag (); loc=mkLocation $startpos; expr=sub; index=index} }
| sub=expression_index index=delimited(LSBRACKET,expression,RSBRACKET)
{ EXPR_Index {tag=mkTag (); loc=mkLocation $startpos; expr=sub; index=index} }
expression_identifier:
| id=identifier { EXPR_Id {tag= mkTag ();loc=mkLocation $startpos;
id=id} }
expression_integer:
| value=INT { EXPR_Int {tag= mkTag ();loc=mkLocation $startpos;
value=Int32.of_int value} }
expression_char:
| value=CHAR { EXPR_Char {tag= mkTag ();loc=mkLocation $startpos;
value=value} }
expression_string:
| value=STRING { EXPR_String {tag= mkTag ();loc=mkLocation $startpos;
value=value} }
expression_bool:
| value=BOOL { EXPR_Bool {tag= mkTag ();loc=mkLocation $startpos;
value=value} }
expression_call:
| value=call { EXPR_Call value }
expression_struct:
| LBRACKET elements=separated_list(COMMA,expression) RBRACKET
{ EXPR_Struct { tag=mkTag (); loc=mkLocation $startpos; elements=elements} }
expression_length:
| LENGTH LPAREN argument=expression RPAREN
{ EXPR_Length { tag=mkTag (); loc=mkLocation $startpos;
arg=argument } }
statement_block:
| LBRACKET body=append(list(terminated(statement,semicolons)),loption(terminated(return_stmt,semicolons))) RBRACKET
{ STMTBlock { loc=mkLocation $startpos;body=body } }
statement:
| left=lvalue ASSIGN right=expression { STMT_Assign {loc=mkLocation $startpos;
lhs=left;rhs=right} }
| block=statement_block {STMT_Block block }
| call=call {STMT_Call call }
| var=var_decl init=option(preceded(ASSIGN,expression))
{STMT_VarDecl { var=var;init=init } }
| WHILE cond=expression body=statement
{ STMT_While {loc=mkLocation $startpos;cond=cond;body=body } }
| IF cond=expression then_branch=statement2 else_branch=option(preceded(ELSE,statement)) (*Menhir attempts to mimic ocamlyacc’s specification, that is, to resolve shift/reduce conflicts in favor of shifting*)
{ STMT_If {loc=mkLocation $startpos;cond=cond;then_branch=then_branch;
else_branch=else_branch } }
| head=option_var_decl COMMA tail=separated_nonempty_list(COMMA, option_var_decl) ASSIGN call=call
{ STMT_MultiVarDecl {loc=mkLocation $startpos; vars= head::tail; init=call } }
statement2:
| left=lvalue ASSIGN right=expression { STMT_Assign {loc=mkLocation $startpos;
lhs=left;rhs=right} }
| block=statement_block {STMT_Block block }
| call=call {STMT_Call call }
| var=var_decl init=option(preceded(ASSIGN,expression))
{STMT_VarDecl { var=var;init=init } }
| WHILE cond=expression body=statement2
{ STMT_While {loc=mkLocation $startpos;cond=cond;body=body } }
| IF cond=expression then_branch=statement2 ELSE else_branch=statement2
{ STMT_If {loc=mkLocation $startpos;cond=cond;then_branch=then_branch;
else_branch=Some else_branch } }
| head=option_var_decl COMMA tail=separated_nonempty_list(COMMA, option_var_decl) ASSIGN call=call
{ STMT_MultiVarDecl {loc=mkLocation $startpos; vars= head::tail; init=call } }
return_stmt:
| RETURN values=separated_list(COMMA,expression)
{ [STMT_Return { loc=mkLocation $startpos; values=values }] }
call:
| callee=identifier LPAREN arguments=separated_list(COMMA,expression) RPAREN
{ Call { tag=mkTag (); loc=mkLocation $startpos;
callee=callee; arguments=arguments } }
lvalue:
| id=identifier {LVALUE_Id {loc=mkLocation $startpos;id=id} }
| sub=lvalue_index LSBRACKET index=expression RSBRACKET
{LVALUE_Index {loc=mkLocation $startpos;sub=sub;index=index} }
lvalue_index:
| node=expression_identifier {node}
| node=expression_call {node}
| sub=lvalue_index LSBRACKET index=expression RSBRACKET
{EXPR_Index {tag=mkTag (); loc=mkLocation $startpos; expr=sub; index=index} }
semicolons:
| option(SEMICOLON) {}
identifier:
| IDENTIFIER
{ Identifier $1 }
(* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
----------------------------------------------------------------------------- *)
|
