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-/*
- * Copyright (c) 2003-2009, John Wiegley. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of New Artisans LLC nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * @addtogroup report
- */
-
-/**
- * @file handler.h
- * @author John Wiegley
- *
- * @ingroup report
- *
- * @brief Defines a scheme for more easily handling commands and options via
- * value expressions.
- *
- * The OPTION and OPTION_ macros are used to define an option handler within a
- * scope_t derived class. The _ variant can specify a body in order to
- * provide HELP(out) and DO() or DO_(args) methods.
- *
- * The other macros are used for looking up and referring to handlers,
- * commands and functions. Typically they occur in the object's lookup
- * method, for example:
- *
- * expr_t::ptr_op_t some_class_t::lookup(const string& name)
- * {
- * const char * p = name.c_str();
- * switch (*p) {
- * case 'a':
- * METHOD(some_class_t, my_method); // looks up a method by name
- * break;
- *
- * case 'c':
- * if (WANT_CMD()) { p += CMD_PREFIX_LEN;
- * switch (*p) {
- * case 'a':
- * COMMAND(args); // looks up global func named "args_command"
- * break;
- * }
- * }
- * break;
- *
- * case 'o':
- * if (WANT_OPT()) { p += OPT_PREFIX_LEN;
- * switch (*p) {
- * case 'f':
- * OPT(foo); // look for a handler named "foo"
- * else OPT(foo2_); // same, but foo2 wants an argument
- * else OPT_(foo3); // match on "foo3" or 'f'
- * else OPT_CH(foo4_); // match only on 'f'
- * break;
- * }
- * }
- * break;
- * }
- *
- * return expr_t::ptr_op_t();
- * }
- */
-#ifndef _HANDLER_H
-#define _HANDLER_H
-
-#include "scope.h"
-
-namespace ledger {
-
-template <typename T>
-class handler_t
-{
- const char * name;
- std::size_t name_len;
- const char ch;
- bool handled;
-
-public:
- T * parent;
- value_t value;
- bool wants_arg;
-
- handler_t(const char * _name, const char _ch = '\0')
- : name(_name), name_len(std::strlen(name)), ch(_ch),
- handled(false), parent(NULL), value(),
- wants_arg(name[name_len - 1] == '_') {
- TRACE_CTOR(handler_t, "const char *, const char");
- }
- handler_t(const handler_t& other)
- : name(other.name),
- name_len(other.name_len),
- ch(other.ch),
- handled(other.handled),
- parent(NULL),
- value(other.value)
- {
- TRACE_CTOR(handler_t, "copy");
- }
-
- virtual ~handler_t() {
- TRACE_DTOR(handler_t);
- }
-
- string desc() const {
- std::ostringstream out;
- if (ch)
- out << "--" << name << " (-" << ch << ")";
- else
- out << "--" << name;
- return out.str();
- }
-
- virtual void help(std::ostream& out) {
- out << "No help for " << desc() << "\n";
- }
-
- operator bool() const {
- return handled;
- }
-
- string& str() {
- assert(handled);
- return value.as_string_lval();
- }
-
- void on() {
- handled = true;
- }
- void on(const char * str) {
- handled = true;
- value = string_value(str);
- }
- void on(const string& str) {
- handled = true;
- value = string_value(str);
- }
- void on(const value_t& val) {
- handled = true;
- value = val;
- }
-
- void off() {
- handled = false;
- value = value_t();
- }
-
- virtual void handler(call_scope_t& args) {
- if (wants_arg)
- value = args[0];
- }
-
- virtual value_t operator()(call_scope_t& args) {
- handled = true;
- handler(args);
- return true;
- }
-};
-
-#define BEGIN(type, name) \
- struct name ## _handler_t : public handler_t<type>
-
-#define CTOR(type, name) \
- name ## _handler_t() : handler_t<type>(#name)
-#define DECL1(type, name, vartype, var, value) \
- vartype var ; \
- name ## _handler_t() : handler_t<type>(#name), var(value)
-
-#define HELP(var) virtual void help(std::ostream& var)
-#define DO() virtual void handler(call_scope_t&)
-#define DO_(var) virtual void handler(call_scope_t& var)
-
-#define END(name) name ## _handler
-
-#define COPY_OPT(name, other) name ## _handler(other.name ## _handler)
-
-#define CALL_FUNCTOR(x) \
- expr_t::op_t::wrap_functor(bind(&x ## _t::operator(), &x, _1))
-
-inline bool optcmp(const char * p, const char * n) {
- // Test whether p matches n, substituting - in p for _ in n.
- for (; *p && *n; p++, n++) {
- if (! (*p == '-' && *n == '_' ) && *p != *n)
- return false;
- }
- return *p == *n;
-}
-
-#define OPT(name) \
- if (optcmp(p, #name)) \
- return ((name ## _handler).parent = this, \
- CALL_FUNCTOR(name ## _handler))
-
-#define OPT_(name) \
- if (! *(p + 1) || \
- ((name ## _handler).wants_arg && \
- *(p + 1) == '_' && ! *(p + 2)) || \
- optcmp(p, #name)) \
- return ((name ## _handler).parent = this, \
- CALL_FUNCTOR(name ## _handler))
-
-#define OPT_CH(name) \
- if (! *(p + 1) || \
- ((name ## _handler).wants_arg && \
- *(p + 1) == '_' && ! *(p + 2))) \
- return ((name ## _handler).parent = this, \
- CALL_FUNCTOR(name ## _handler))
-
-#define FUNCTION(name) \
- if (std::strcmp(p, #name) == 0) \
- return WRAP_FUNCTOR(fn_ ## name)
-
-#define METHOD(type, name) \
- if (std::strcmp(p, #name) == 0) \
- return MAKE_FUNCTOR(type::fn_ ## name)
-
-#define M_COMMAND(type, name) \
- if (std::strcmp(p, #name) == 0) \
- return MAKE_FUNCTOR(type::name ## _command)
-
-#define COMMAND(name) \
- if (std::strcmp(p, #name) == 0) \
- return WRAP_FUNCTOR(name ## _command)
-
-#define HANDLER(name) name ## _handler
-#define HANDLED(name) HANDLER(name)
-
-#define OPTION(type, name) \
- BEGIN(type, name) \
- { \
- CTOR(type, name) {} \
- } \
- END(name)
-
-#define OPTION_(type, name, body) \
- BEGIN(type, name) \
- { \
- CTOR(type, name) {} \
- body \
- } \
- END(name)
-
-#define OPTION__(type, name, body) \
- BEGIN(type, name) \
- { \
- body \
- } \
- END(name)
-
-#define OPT_PREFIX "opt_"
-#define OPT_PREFIX_LEN 4
-
-#define WANT_OPT() \
- (std::strncmp(p, OPT_PREFIX, OPT_PREFIX_LEN) == 0)
-
-#define PRECMD_PREFIX "precmd_"
-#define PRECMD_PREFIX_LEN 7
-
-#define WANT_PRECMD() \
- (std::strncmp(p, PRECMD_PREFIX, PRECMD_PREFIX_LEN) == 0)
-
-#define CMD_PREFIX "cmd_"
-#define CMD_PREFIX_LEN 4
-
-#define WANT_CMD() \
- (std::strncmp(p, CMD_PREFIX, CMD_PREFIX_LEN) == 0)
-
-#define DIR_PREFIX "dir_"
-#define DIR_PREFIX_LEN 4
-
-#define WANT_DIR() \
- (std::strncmp(p, DIR_PREFIX, DIR_PREFIX_LEN) == 0)
-
-} // namespace ledger
-
-#endif // _HANDLER_H
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