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// file : build2/rule.hxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD2_RULE_HXX
#define BUILD2_RULE_HXX
#include <build2/types.hxx>
#include <build2/utility.hxx>
#include <build2/target.hxx>
#include <build2/operation.hxx>
namespace build2
{
// Once a rule is registered (for a scope), it is treated as immutable. If
// you need to modify some state (e.g., counters or some such), then make
// sure it is MT-safe.
//
// Note: match() is only called once but may not be followed by apply().
//
class rule
{
public:
virtual bool
match (action, target&, const string& hint) const = 0;
virtual recipe
apply (action, target&) const = 0;
};
// Fallback rule that only matches if the file exists.
//
class file_rule: public rule
{
public:
file_rule () {}
virtual bool
match (action, target&, const string&) const override;
virtual recipe
apply (action, target&) const override;
static const file_rule instance;
};
class alias_rule: public rule
{
public:
alias_rule () {}
virtual bool
match (action, target&, const string&) const override;
virtual recipe
apply (action, target&) const override;
static const alias_rule instance;
};
class fsdir_rule: public rule
{
public:
fsdir_rule () {}
virtual bool
match (action, target&, const string&) const override;
virtual recipe
apply (action, target&) const override;
static target_state
perform_update (action, const target&);
static target_state
perform_clean (action, const target&);
// Sometimes, as an optimization, we want to emulate execute_direct()
// of fsdir{} without the overhead of switching to the execute phase.
//
static void
perform_update_direct (action, const target&);
static const fsdir_rule instance;
};
// Fallback rule that always matches and does nothing.
//
class fallback_rule: public build2::rule
{
public:
fallback_rule () {}
virtual bool
match (action, target&, const string&) const override
{
return true;
}
virtual recipe
apply (action, target&) const override {return noop_recipe;}
static const fallback_rule instance;
};
}
#endif // BUILD2_RULE_HXX
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