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pacciani/Monicelli.ypp

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%code top {
#include "Nodes.hpp"
using namespace monicelli;
}
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%skeleton "lalr1.cc"
%require "3.0"
%language "c++"
%defines
%output "Parser.cpp"
%locations
%token-table
%define parse.error verbose
%define api.namespace {monicelli}
%define parser_class_name {Parser}
%lex-param {Scanner &scanner}
%parse-param {Scanner &scanner}
%parse-param {Program &program}
%code requires {
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#include "Nodes.hpp"
namespace monicelli {
class Scanner;
}
}
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%code {
static int yylex(Parser::semantic_type*, Parser::location_type*, Scanner&);
}
%token MAIN
%token RETURN
%token ARTICLE TYPENAME STAR
%token VARDECL ASSIGN
%token PRINT INPUT
%token ASSERT BANG
%token LOOP_BEGIN LOOP_CONDITION
%token BRANCH_CONDITION BRANCH_BEGIN BRANCH_ELSE BRANCH_END CASE_END
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%token COLON COMMA
%token FUNDECL PARAMS FUNCALL FUN_END
%token ABORT
%token ID NUMBER FLOAT
%left OP_LT OP_GT OP_LTE OP_GTE
%left OP_PLUS OP_MINUS
%left OP_TIMES OP_DIV
%left OP_SHL OP_SHR
%nonassoc LOWER_THAN_ELSE
%nonassoc BRANCH_ELSE
%code {
#include <stack>
static std::stack<StatementList*> stmtStack;
static std::stack<ExpressionList*> argsStack;
static std::stack<IdList*> paramsStack;
static std::stack<BranchCaseList*> branchCaseStack;
}
%union {
int intval;
double floatval;
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std::string* strval;
bool boolval;
Type typeval;
Statement* statementval;
StatementList* statlistval;
Assert* assertval;
FunctionCall* callval;
Print* printval;
Input* inputval;
Abort* abortval;
Branch* branchval;
VarDeclaration* declval;
Assignment* assignval;
Loop* loopval;
BranchCase *caseval;
Return* returnval;
Expression* expressionval;
SemiExpression *semiexpval;
Id* idval;
Number* numericval;
Function* funval;
Main* mainval;
}
%type<intval> NUMBER
%type<floatval> FLOAT
%type<strval> ID
%type<typeval> TYPENAME
%type<statementval> statement
%type<statlistval> branch_body
%type<assertval> assert_stmt
%type<callval> fun_call
%type<funval> fun_decl
%type<printval> print_stmt
%type<inputval> input_stmt
%type<abortval> abort_stmt
%type<branchval> branch_stmt
%type<caseval> case_stmt
%type<declval> var_decl
%type<assignval> assign_stmt
%type<loopval> loop_stmt
%type<returnval> return_stmt
%type<expressionval> expression maybe_expression simple_expression var_init
%type<semiexpval> semi_expression
%type<idval> variable
%type<numericval> numeric
%type<mainval> main
%type<boolval> pointer
%start program
%%
program:
/* epsilon */
| fun_decls main fun_decls {
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program.setMain($2);
}
;
fun_decls:
/* epsilon */
| fun_decl {
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program.addFunction($1);
}
fun_decls
;
fun_decl:
FUNDECL ID {
paramsStack.push(new IdList());
} args FUN_END {
stmtStack.push(new StatementList());
}
statements {
$$ = new Function(new Id($2), paramsStack.top(), stmtStack.top());
paramsStack.pop();
stmtStack.pop();
}
;
args:
/* epsilon */ | PARAMS arglist
;
arglist:
variable {
paramsStack.top()->push_back($1);
}
| variable {
paramsStack.top()->push_back($1);
}
arglist
;
main:
MAIN {
stmtStack.push(new StatementList());
}
statements {
$$ = new Main(stmtStack.top());
stmtStack.pop();
}
;
statements:
/* epsilon */ {
}
| statement {
if ($1 != nullptr) {
stmtStack.top()->push_back($1);
}
}
statements
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;
statement:
assert_stmt { $$ = $1; }
| fun_call { $$ = $1; }
| print_stmt { $$ = $1; }
| input_stmt { $$ = $1; }
| abort_stmt { $$ = $1; }
| branch_stmt { $$ = $1; }
| var_decl { $$ = $1; }
| assign_stmt { $$ = $1; }
| loop_stmt { $$ = $1; }
| return_stmt { $$ = $1; }
| COMMA { $$ = nullptr; }
;
var_decl:
VARDECL variable COMMA pointer TYPENAME var_init {
$$ = new VarDeclaration($2, $5, $4, $6);
}
;
pointer:
/* epsilon */ { $$ = false; } | STAR { $$ = true; }
;
var_init:
/* epsilon */ { $$ = nullptr; } | ASSIGN expression { $$ = $2; }
;
numeric:
NUMBER { $$ = new Integer($1); } | FLOAT { $$ = new Float($1); }
;
variable:
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ID {
$$ = new Id($1);
}
| ARTICLE ID {
$$ = new Id($2);
}
;
assign_stmt:
variable ASSIGN expression {
$$ = new Assignment($1, $3);
}
;
print_stmt:
expression PRINT {
$$ = new Print($1);
}
;
input_stmt:
INPUT variable {
$$ = new Input($2);
}
;
return_stmt:
RETURN maybe_expression BANG {
$$ = new Return($2);
}
;
maybe_expression:
expression { $$ = $1; } | /* epsilon */ { $$ = nullptr; }
;
loop_stmt:
LOOP_BEGIN {
stmtStack.push(new StatementList());
}
statements LOOP_CONDITION expression {
$$ = new Loop(stmtStack.top(), $5);
stmtStack.pop();
}
;
branch_stmt:
BRANCH_CONDITION variable BRANCH_BEGIN {
branchCaseStack.push(new BranchCaseList());
}
branch_body BRANCH_END {
$$ = new Branch($2, branchCaseStack.top(), $5);
branchCaseStack.pop();
}
;
branch_body:
cases %prec LOWER_THAN_ELSE {
$$ = nullptr;
}
| cases BRANCH_ELSE COLON {
stmtStack.push(new StatementList());
}
statements {
$$ = stmtStack.top();
stmtStack.pop();
}
;
cases:
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case_stmt | case_stmt CASE_END cases
;
case_stmt:
semi_expression COLON {
stmtStack.push(new StatementList());
} statements {
branchCaseStack.top()->push_back(new BranchCase($1, stmtStack.top()));
stmtStack.pop();
}
;
fun_call:
FUNCALL {
argsStack.push(new ExpressionList());
}
ID call_args FUN_END {
$$ = new FunctionCall(new Id($3), argsStack.top());
argsStack.pop();
}
;
call_args:
/* epsilon */ | PARAMS call_arglist
;
call_arglist:
expression { argsStack.top()->push_back($1); }
| expression { argsStack.top()->push_back($1); } COMMA call_arglist
;
abort_stmt:
ABORT {
$$ = new Abort();
}
;
assert_stmt:
ASSERT expression BANG {
$$ = new Assert($2);
}
;
expression:
simple_expression {
$$ = $1;
}
| expression OP_LT expression {
$$ = new ExpLt($1, $3);
}
| expression OP_GT expression {
$$ = new ExpGt($1, $3);
}
| expression OP_LTE expression {
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$$ = new ExpLte($1, $3);
}
| expression OP_GTE expression {
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$$ = new ExpGte($1, $3);
}
| expression OP_PLUS expression {
$$ = new ExpPlus($1, $3);
}
| expression OP_MINUS expression {
$$ = new ExpMinus($1, $3);
}
| expression OP_TIMES expression {
$$ = new ExpTimes($1, $3);
}
| expression OP_DIV expression {
$$ = new ExpDiv($1, $3);
}
| expression OP_SHL expression {
$$ = new ExpShl($1, $3);
}
| expression OP_SHR expression {
$$ = new ExpShr($1, $3);
}
;
semi_expression:
expression {
$$ = new SemiExpEq($1);
}
| OP_LT expression {
$$ = new SemiExpLt($2);
}
| OP_GT expression {
$$ = new SemiExpGt($2);
}
| OP_LTE expression {
$$ = new SemiExpLte($2);
}
| OP_GTE expression {
$$ = new SemiExpGte($2);
}
| OP_PLUS expression {
$$ = new SemiExpPlus($2);
}
| OP_MINUS expression {
$$ = new SemiExpMinus($2);
}
| OP_TIMES expression {
$$ = new SemiExpTimes($2);
}
| OP_DIV expression {
$$ = new SemiExpDiv($2);
}
| OP_SHL expression {
$$ = new SemiExpShl($2);
}
| OP_SHR expression {
$$ = new SemiExpShr($2);
}
;
simple_expression:
fun_call { $$ = $1; }
| numeric { $$ = $1; }
| variable { $$ = $1; }
;
%%
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#include "Scanner.hpp"
void Parser::error(const location_type& loc, const std::string &message) {
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std::cerr << "At " << loc.begin.line << "," << loc.begin.column;
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std::cerr << ": " << message << std::endl;
}
static int yylex(Parser::semantic_type *lval, Parser::location_type *loc, Scanner &scanner) {
return scanner.yylex(lval);
}