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|
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Jip J. Dekker <jip.dekker@monash.edu>
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
%define api.header.include {<minizinc/support/regex_parser.tab.hh>}
%{
#include <cstdlib>
#include <cstdio>
#include <iostream>
#include <minizinc/support/regex.hh>
using namespace Gecode;
using namespace MiniZinc;
typedef struct yy_buffer_state *YY_BUFFER_STATE;
YY_BUFFER_STATE regex_yy_scan_string ( const char* yy_str );
extern int yylex();
extern FILE* yyin;
typedef struct REContext{
REG* expr;
const IntSetVal& dom;
} REContext;
void yyerror(REContext& ctx, const char* s);
%}
%union {
int iValue;
char* sValue;
std::set<int>* setValue;
Gecode::REG* rValue;
}
%parse-param {REContext& ctx}
%token<iValue> R_INTEGER
%token R_GROUP_OPEN "("
%token R_GROUP_CLOSE ")"
%token R_STAR "*"
%token R_PLUS "+"
%token R_ANY "."
%token R_UNION "|"
%token R_OPTIONAL "?"
%token R_QUANT_OPEN "{"
%token R_QUANT_CLOSE "}"
%token R_COMMA ","
%token R_CLASS_OPEN "["
%token R_CLASS_CLOSE "]"
%token R_CLASS_RANGE "-"
%token R_CLASS_NEG "^"
%token<sValue> R_IDENTIFIER
%type<rValue> regex expression term factor atom
%type<setValue> set_item set_items
%start regex
%%
regex:
expression
{
*ctx.expr = (*$1);
delete $1;
}
expression:
term
| term "|" expression
{
*$1 = *$1 | *$3;
delete $3;
$$ = $1;
}
term:
factor
| factor term
{
*$1 = *$1 + *$2;
delete $2;
$$ = $1;
}
factor:
atom
| atom "*"
{
*$1 = *(*$1);
$$ = $1;
}
| atom "+"
{
*$1 = +(*$1);
$$ = $1;
}
| atom "?"
{
*$1 = (*$1)(0, 1);
$$ = $1;
}
| atom "{" R_INTEGER "}"
{
*$1 = (*$1)($3, $3);
$$ = $1;
}
| atom "{" R_INTEGER "," "}"
{
*$1 = (*$1)($3);
$$ = $1;
}
| atom "{" R_INTEGER "," R_INTEGER "}"
{
*$1 = (*$1)($3, $5);
$$ = $1;
}
atom:
R_INTEGER
{ $$ = new REG($1); }
| "."
{
IntArgs range = IntArgs::create(static_cast<int>(ctx.dom.max().toInt() - ctx.dom.min().toInt()) + 1,
static_cast<int>(ctx.dom.min().toInt()));
$$ = new REG(range);
}
| "[" set_items "]"
{
std::vector<int> v;
v.reserve($2->size());
for(auto i : *$2) {
v.push_back(i);
}
delete $2;
$$ = new REG(IntArgs(v));
}
| "[" "^" set_items "]"
{
std::vector<int> diff;
std::set<int> domain;
for(auto i = ctx.dom.min().toInt(); i<=ctx.dom.max().toInt(); ++i) {
domain.insert(static_cast<int>(i));
}
std::set_difference(
domain.begin(), domain.end(),
$3->begin(), $3->end(),
std::inserter(diff, diff.begin())
);
delete $3;
$$ = new REG(IntArgs(diff));
}
| "(" expression ")"
{ $$ = $2; }
set_items:
set_item
| set_item set_items
{
$$ = $1;
for (auto i : *$2) {
$1->insert(i);
}
delete $2;
}
set_item:
R_INTEGER
{
$$ = new std::set<int>({$1});
}
| R_INTEGER "-" R_INTEGER
{
int from = $1;
int to = $3;
if (to < from) {
std::swap(from,to);
}
$$ = new std::set<int>;
for(int i = from; i<=to; ++i) {
$$->insert(i);
}
}
%%
void yyerror(REContext& ctx, const char* s) {
// TODO: Add error location
throw std::runtime_error("Cannot parse regular expression: " + std::string(s));
}
std::unique_ptr<REG> regex_from_string(const std::string& regex_str, const IntSetVal& domain) {
REG* expr = new REG();
regex_yy_scan_string(regex_str.c_str());
REContext rctx = REContext{expr, domain};
int err = yyparse(rctx);
if (err != 0) {
throw std::runtime_error("Cannot parse regular expression, error code " + std::to_string(err));
}
return std::unique_ptr<REG>(expr);
}
|
