minix/external/bsd/atf/dist/atf-c++/detail/parser.cpp

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//
// Automated Testing Framework (atf)
//
// Copyright (c) 2007 The NetBSD Foundation, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. 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.
//
// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
//
#include <sstream>
#include "parser.hpp"
#include "sanity.hpp"
#include "text.hpp"
namespace impl = atf::parser;
#define IMPL_NAME "atf::parser"
// ------------------------------------------------------------------------
// The "parse_error" class.
// ------------------------------------------------------------------------
impl::parse_error::parse_error(size_t line, std::string msg) :
std::runtime_error(msg),
std::pair< size_t, std::string >(line, msg)
{
}
impl::parse_error::~parse_error(void)
throw()
{
}
const char*
impl::parse_error::what(void)
const throw()
{
try {
std::ostringstream oss;
oss << "LONELY PARSE ERROR: " << first << ": " << second;
m_msg = oss.str();
return m_msg.c_str();
} catch (...) {
return "Could not format message for parsing error.";
}
}
impl::parse_error::operator std::string(void)
const
{
return atf::text::to_string(first) + ": " + second;
}
// ------------------------------------------------------------------------
// The "parse_errors" class.
// ------------------------------------------------------------------------
impl::parse_errors::parse_errors(void) :
std::runtime_error("No parsing errors yet")
{
m_msg.clear();
}
impl::parse_errors::~parse_errors(void)
throw()
{
}
const char*
impl::parse_errors::what(void)
const throw()
{
try {
m_msg = atf::text::join(*this, "\n");
return m_msg.c_str();
} catch (...) {
return "Could not format messages for parsing errors.";
}
}
// ------------------------------------------------------------------------
// The "format_error" class.
// ------------------------------------------------------------------------
impl::format_error::format_error(const std::string& w) :
std::runtime_error(w.c_str())
{
}
// ------------------------------------------------------------------------
// The "token" class.
// ------------------------------------------------------------------------
impl::token::token(void) :
m_inited(false)
{
}
impl::token::token(size_t p_line,
const token_type& p_type,
const std::string& p_text) :
m_inited(true),
m_line(p_line),
m_type(p_type),
m_text(p_text)
{
}
size_t
impl::token::lineno(void)
const
{
return m_line;
}
const impl::token_type&
impl::token::type(void)
const
{
return m_type;
}
const std::string&
impl::token::text(void)
const
{
return m_text;
}
impl::token::operator bool(void)
const
{
return m_inited;
}
bool
impl::token::operator!(void)
const
{
return !m_inited;
}
// ------------------------------------------------------------------------
// The "header_entry" class.
// ------------------------------------------------------------------------
impl::header_entry::header_entry(void)
{
}
impl::header_entry::header_entry(const std::string& n, const std::string& v,
attrs_map as) :
m_name(n),
m_value(v),
m_attrs(as)
{
}
const std::string&
impl::header_entry::name(void) const
{
return m_name;
}
const std::string&
impl::header_entry::value(void) const
{
return m_value;
}
const impl::attrs_map&
impl::header_entry::attrs(void) const
{
return m_attrs;
}
bool
impl::header_entry::has_attr(const std::string& n) const
{
return m_attrs.find(n) != m_attrs.end();
}
const std::string&
impl::header_entry::get_attr(const std::string& n) const
{
attrs_map::const_iterator iter = m_attrs.find(n);
PRE(iter != m_attrs.end());
return (*iter).second;
}
// ------------------------------------------------------------------------
// The header tokenizer.
// ------------------------------------------------------------------------
namespace header {
static const impl::token_type eof_type = 0;
static const impl::token_type nl_type = 1;
static const impl::token_type text_type = 2;
static const impl::token_type colon_type = 3;
static const impl::token_type semicolon_type = 4;
static const impl::token_type dblquote_type = 5;
static const impl::token_type equal_type = 6;
class tokenizer : public impl::tokenizer< std::istream > {
public:
tokenizer(std::istream& is, size_t curline) :
impl::tokenizer< std::istream >
(is, true, eof_type, nl_type, text_type, curline)
{
add_delim(';', semicolon_type);
add_delim(':', colon_type);
add_delim('=', equal_type);
add_quote('"', dblquote_type);
}
};
static
impl::parser< header::tokenizer >&
read(impl::parser< header::tokenizer >& p, impl::header_entry& he)
{
using namespace header;
impl::token t = p.expect(text_type, nl_type, "a header name");
if (t.type() == nl_type) {
he = impl::header_entry();
return p;
}
std::string hdr_name = t.text();
t = p.expect(colon_type, "`:'");
t = p.expect(text_type, "a textual value");
std::string hdr_value = t.text();
impl::attrs_map attrs;
for (;;) {
t = p.expect(eof_type, semicolon_type, nl_type,
"eof, `;' or new line");
if (t.type() == eof_type || t.type() == nl_type)
break;
t = p.expect(text_type, "an attribute name");
std::string attr_name = t.text();
t = p.expect(equal_type, "`='");
t = p.expect(text_type, "word or quoted string");
std::string attr_value = t.text();
attrs[attr_name] = attr_value;
}
he = impl::header_entry(hdr_name, hdr_value, attrs);
return p;
}
static
std::ostream&
write(std::ostream& os, const impl::header_entry& he)
{
std::string line = he.name() + ": " + he.value();
impl::attrs_map as = he.attrs();
for (impl::attrs_map::const_iterator iter = as.begin(); iter != as.end();
iter++) {
PRE((*iter).second.find('\"') == std::string::npos);
line += "; " + (*iter).first + "=\"" + (*iter).second + "\"";
}
os << line << "\n";
return os;
}
} // namespace header
// ------------------------------------------------------------------------
// Free functions.
// ------------------------------------------------------------------------
std::pair< size_t, impl::headers_map >
impl::read_headers(std::istream& is, size_t curline)
{
using impl::format_error;
headers_map hm;
//
// Grammar
//
// header = entry+ nl
// entry = line nl
// line = text colon text
// (semicolon (text equal (text | dblquote string dblquote)))*
// string = quoted_string
//
header::tokenizer tkz(is, curline);
impl::parser< header::tokenizer > p(tkz);
bool first = true;
for (;;) {
try {
header_entry he;
if (!header::read(p, he).good() || he.name().empty())
break;
if (first && he.name() != "Content-Type")
throw format_error("Could not determine content type");
else
first = false;
hm[he.name()] = he;
} catch (const impl::parse_error& pe) {
p.add_error(pe);
p.reset(header::nl_type);
}
}
if (!is.good())
throw format_error("Unexpected end of stream");
return std::pair< size_t, headers_map >(tkz.lineno(), hm);
}
void
impl::write_headers(const impl::headers_map& hm, std::ostream& os)
{
PRE(!hm.empty());
headers_map::const_iterator ct = hm.find("Content-Type");
PRE(ct != hm.end());
header::write(os, (*ct).second);
for (headers_map::const_iterator iter = hm.begin(); iter != hm.end();
iter++) {
if ((*iter).first != "Content-Type")
header::write(os, (*iter).second);
}
os << "\n";
}
void
impl::validate_content_type(const impl::headers_map& hm, const std::string& fmt,
int version)
{
using impl::format_error;
headers_map::const_iterator iter = hm.find("Content-Type");
if (iter == hm.end())
throw format_error("Could not determine content type");
const header_entry& he = (*iter).second;
if (he.value() != fmt)
throw format_error("Mismatched content type: expected `" + fmt +
"' but got `" + he.value() + "'");
if (!he.has_attr("version"))
throw format_error("Could not determine version");
const std::string& vstr = atf::text::to_string(version);
if (he.get_attr("version") != vstr)
throw format_error("Mismatched version: expected `" +
vstr + "' but got `" +
he.get_attr("version") + "'");
}