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|
%language "c++"
%require "3.2"
%code requires {
#include <string>
#include "Location.hh"
namespace pcc {
class Driver;
}
}
%locations
%param {pcc::Driver& driver}
%code {
#include "Driver.hh"
}
%define api.namespace {pcc}
%define api.parser.class {Parser}
%define api.location.type {pcc::Location}
%define api.value.type variant
%define api.token.constructor
%define parse.error verbose
%define parse.assert
%token COLON SEMICOLON COMMA DOT ASSIGN LBRACKET RBRACKET LPARENTHESIS RPARENTHESIS
%token PROGRAM IDENTIFIER CONST VAR BEGINS ENDS FUNCTION FILE_END
%token IF THEN ELSE WHILE DO
%token INTEGER BOOLEAN CHAR REAL STRING
%token ADD SUB MUL REAL_DIV DIV MOD EXP LT LE GT GE EQ NE
%token AND NOT OR XOR TRUE FALSE
%token INTEGER_LITERAL REAL_LITERAL STRING_LITERAL
%type <int> INTEGER_LITERAL
%type <float> REAL_LITERAL
%type <char*> STRING_LITERAL
%type <char*> IDENTIFIER
%%
/* ==================[global part]================== */
program
: program_decl global_decls function_decls
;
program_decl
: PROGRAM IDENTIFIER SEMICOLON
;
global_decls
: var_block
;
function_decls
: function_decls function_decl
|
;
/* ==================[var part]================== */
var_block
: VAR var_decls SEMICOLON
;
var_decls
: var_decls SEMICOLON var_decl
| var_decl
;
var_decl
: vars COLON var_type
;
vars
: vars COMMA IDENTIFIER
| IDENTIFIER
var_type
: INTEGER
| REAL
| BOOLEAN
| CHAR
| STRING
;
/* ==================[function part]================== */
function_decl
: function_header function_body
;
function_header
: FUNCTION IDENTIFIER LPARENTHESIS var_decls RPARENTHESIS COLON var_type SEMICOLON
;
function_body
: var_block statement_block SEMICOLON
| statement_block SEMICOLON
;
/* ==================[statements part]================== */
statements
: statements statement SEMICOLON
|
;
statement
: closed_statement
| open_statement
;
open_statement
: IF expression THEN statement
| IF expression THEN closed_statement ELSE open_statement
;
closed_statement
: normal_statement
| IF expression THEN closed_statement ELSE closed_statement
;
normal_statement
: statement_block
| empty_statement
| assign_statement
| while_statement
| expression_statement
;
statement_block
: BEGINS statements ENDS
;
empty_statement
:
;
assign_statement
: lvalue ASSIGN expression
;
while_statement
: WHILE expression DO statement
;
expression_statement
: function_call
;
/* ==================[expression part]================== */
expression
: l1_expression l1_operator expression
| l1_expression
;
l1_expression
: l1_expression l2_operator l2_expression
| l2_expression
;
l2_expression
: l2_expression l3_operator l3_expression
| l3_expression
;
l3_expression
: l3_expression l4_operator l4_expression
| l4_expression
l4_expression
: lvalue
| function_call
| literal
| LPARENTHESIS expression RPARENTHESIS
| l5_operator l4_expression
;
l1_operator
: LT
| LE
| GT
| GE
| EQ
| NE
;
l2_operator
: ADD
| SUB
| OR
| XOR
;
l3_operator
: MUL
| REAL_DIV
| DIV
| MOD
| AND
;
l4_operator
: EXP
;
l5_operator
: NOT
| ADD
| SUB
;
lvalue
: IDENTIFIER
| IDENTIFIER LBRACKET expression RBRACKET
| IDENTIFIER DOT IDENTIFIER
;
function_call
: IDENTIFIER LPARENTHESIS arguments RPARENTHESIS
| IDENTIFIER LPARENTHESIS RPARENTHESIS
;
arguments
: arguments COMMA expression
| expression
;
literal
: TRUE
| FALSE
| INTEGER_LITERAL
| REAL_LITERAL
| STRING_LITERAL
;
%%
namespace pcc {
void Parser::error (const location_type& l, const std::string& m)
{
std::cerr << l << ":" << m << '\n';
}
}
|
