248 lines
7.3 KiB
C++
248 lines
7.3 KiB
C++
/*
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* Copyright (c) 2003-2018, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <system.hh>
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#include "option.h"
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namespace ledger {
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namespace {
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typedef std::pair<expr_t::ptr_op_t, bool> op_bool_tuple;
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op_bool_tuple find_option(scope_t& scope, const string& name)
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{
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char buf[128];
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char * p = buf;
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foreach (char ch, name) {
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if (ch == '-')
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*p++ = '_';
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else
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*p++ = ch;
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}
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*p++ = '_';
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*p = '\0';
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if (expr_t::ptr_op_t op = scope.lookup(symbol_t::OPTION, buf))
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return op_bool_tuple(op, true);
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*--p = '\0';
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return op_bool_tuple(scope.lookup(symbol_t::OPTION, buf), false);
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}
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op_bool_tuple find_option(scope_t& scope, const char letter)
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{
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char buf[4];
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buf[0] = letter;
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buf[1] = '_';
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buf[2] = '\0';
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if (expr_t::ptr_op_t op = scope.lookup(symbol_t::OPTION, buf))
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return op_bool_tuple(op, true);
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buf[1] = '\0';
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return op_bool_tuple(scope.lookup(symbol_t::OPTION, buf), false);
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}
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void process_option(const string& whence, const expr_t::func_t& opt,
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scope_t& scope, const char * arg, const string& name)
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{
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try {
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call_scope_t args(scope);
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args.push_back(string_value(whence));
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if (arg)
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args.push_back(string_value(arg));
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opt(args);
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}
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catch (const std::exception&) {
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if (name[0] == '-')
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add_error_context(_f("While parsing option '%1%'") % name);
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else
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add_error_context(_f("While parsing environent variable '%1%'") % name);
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throw;
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}
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}
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}
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bool process_option(const string& whence, const string& name, scope_t& scope,
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const char * arg, const string& varname)
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{
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op_bool_tuple opt(find_option(scope, name));
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if (opt.first) {
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process_option(whence, opt.first->as_function(), scope, arg, varname);
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return true;
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}
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return false;
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}
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void process_environment(const char ** envp, const string& tag,
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scope_t& scope)
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{
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const char * tag_p = tag.c_str();
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string::size_type tag_len = tag.length();
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assert(tag_p);
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assert(tag_len > 0);
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for (const char ** p = envp; *p; p++) {
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if (std::strlen(*p) >= tag_len && std::strncmp(*p, tag_p, tag_len) == 0) {
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char buf[8192];
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char * r = buf;
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const char * q;
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for (q = *p + tag_len;
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*q && *q != '=' && r - buf < 8191;
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q++)
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if (*q == '_')
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*r++ = '-';
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else
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*r++ = static_cast<char>(std::tolower(*q));
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*r = '\0';
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if (*q == '=') {
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try {
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string value = string(*p, static_cast<std::string::size_type>(q - *p));
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if (! value.empty())
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process_option(string("$") + buf, string(buf), scope, q + 1, value);
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}
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catch (const std::exception&) {
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add_error_context(_f("While parsing environment variable option '%1%':")
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% *p);
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throw;
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}
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}
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}
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}
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}
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namespace {
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struct op_bool_char_tuple {
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expr_t::ptr_op_t op;
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bool truth;
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char ch;
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op_bool_char_tuple(expr_t::ptr_op_t _op, bool _truth, char _ch)
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: op(_op), truth(_truth), ch(_ch) {}
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};
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}
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strings_list process_arguments(strings_list args, scope_t& scope)
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{
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bool anywhere = true;
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strings_list remaining;
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for (strings_list::iterator i = args.begin();
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i != args.end();
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i++) {
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DEBUG("option.args", "Examining argument '" << *i << "'");
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if (! anywhere || (*i)[0] != '-') {
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DEBUG("option.args", " adding to list of real args");
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remaining.push_back(*i);
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continue;
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}
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// --long-option or -s
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if ((*i)[1] == '-') {
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if ((*i)[2] == '\0') {
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DEBUG("option.args", " it's a --, ending options processing");
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anywhere = false;
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continue;
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}
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DEBUG("option.args", " it's an option string");
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string opt_name;
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const char * name = (*i).c_str() + 2;
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const char * value = NULL;
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if (const char * p = std::strchr(name, '=')) {
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opt_name = string(name, static_cast<std::string::size_type>(p - name));
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value = ++p;
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DEBUG("option.args", " read option value from option: " << value);
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} else {
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opt_name = name;
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}
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op_bool_tuple opt(find_option(scope, opt_name));
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if (! opt.first)
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throw_(option_error, _f("Illegal option --%1%") % name);
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if (opt.second && ! value && ++i != args.end() && value == NULL) {
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value = (*i).c_str();
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DEBUG("option.args", " read option value from arg: " << value);
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if (value == NULL)
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throw_(option_error, _f("Missing option argument for --%1%") % name);
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}
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process_option(string("--") + name,
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opt.first->as_function(), scope, value,
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string("--") + name);
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}
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else if ((*i)[1] == '\0') {
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throw_(option_error, _f("illegal option -%1%") % (*i)[0]);
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}
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else {
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DEBUG("option.args", " single-char option");
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std::list<op_bool_char_tuple> option_queue;
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std::string::size_type x = 1;
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for (char c = (*i)[x]; c != '\0'; x++, c = (*i)[x]) {
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op_bool_tuple opt(find_option(scope, c));
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if (! opt.first)
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throw_(option_error, _f("Illegal option -%1%") % c);
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option_queue.push_back(op_bool_char_tuple(opt.first, opt.second, c));
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}
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foreach (op_bool_char_tuple& o, option_queue) {
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const char * value = NULL;
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if (o.truth && ++i != args.end()) {
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value = (*i).c_str();
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DEBUG("option.args", " read option value from arg: " << value);
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if (value == NULL)
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throw_(option_error,
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_f("Missing option argument for -%1%") % o.ch);
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}
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process_option(string("-") + o.ch, o.op->as_function(), scope, value,
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string("-") + o.ch);
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}
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}
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}
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return remaining;
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}
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} // namespace ledger
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