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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "systemstate.h"
#include "nodestate.h"
#include <vespa/vespalib/util/sync.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_parse_tree.hpp>
#include <boost/spirit/include/classic_tree_to_xml.hpp>
#include <boost/spirit/include/classic_chset.hpp>
#include <boost/spirit/include/classic_escape_char.hpp>
#include <boost/spirit/include/classic_grammar_def.hpp>
#include <vespa/log/log.h>
LOG_SETUP(".systemstate");
using namespace documentapi;
/**
* This class implements a boost::spirit type parser for the system state string. All contained names
* confirm to the boost::spirit naming convention, and care should therefore be taken if one wishes
* to modify any of these. Note that all content is inlined, just as all of boost::spirit, so this is
* therefore contained in the .cpp file instead of a separate .h file.
*/
struct SystemStateGrammar : public boost::spirit::classic::grammar<SystemStateGrammar> {
enum RuleId {
id_hexChar = 1,
id_hexCode,
id_alphaNum,
id_string,
id_argument,
id_argumentList,
id_locationItem,
id_location,
id_systemState
};
template <typename Scanner>
struct gram_base {
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_hexChar> > rule_hexChar;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_hexCode> > rule_hexCode;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_alphaNum> > rule_alphaNum;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_string> > rule_string;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_argument> > rule_argument;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_argumentList> > rule_argumentList;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_locationItem> > rule_locationItem;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_location> > rule_location;
typedef typename boost::spirit::classic::rule<Scanner, boost::spirit::classic::parser_tag<id_systemState> > rule_systemState;
typedef boost::spirit::classic::grammar_def<rule_systemState> type;
};
template <typename Scanner>
struct definition : gram_base<Scanner>::type {
typename gram_base<Scanner>::rule_hexChar _hexChar;
typename gram_base<Scanner>::rule_hexCode _hexCode;
typename gram_base<Scanner>::rule_alphaNum _alphaNum;
typename gram_base<Scanner>::rule_string _string;
typename gram_base<Scanner>::rule_argument _argument;
typename gram_base<Scanner>::rule_argumentList _argumentList;
typename gram_base<Scanner>::rule_locationItem _locationItem;
typename gram_base<Scanner>::rule_location _location;
typename gram_base<Scanner>::rule_systemState _systemState;
definition(const SystemStateGrammar &) :
_hexChar(),
_hexCode(),
_alphaNum(),
_string(),
_argument(),
_argumentList(),
_locationItem(),
_location(),
_systemState() {
_hexChar = ( boost::spirit::classic::chset<>("A-Fa-f0-9") );
_hexCode = ( boost::spirit::classic::ch_p('%') >> _hexChar >> _hexChar);
_alphaNum = ( boost::spirit::classic::chset<>("A-Za-z0-9") |
boost::spirit::classic::ch_p('-') | boost::spirit::classic::ch_p('.') |
boost::spirit::classic::ch_p('_') | boost::spirit::classic::ch_p('~') );
_string = ( +( boost::spirit::classic::ch_p('+') | _hexCode | _alphaNum ) );
_argument = ( _string >> boost::spirit::classic::ch_p('=') >> _string );
_argumentList = ( _argument >> *( boost::spirit::classic::ch_p('&') >> _argument ) );
_locationItem = ( boost::spirit::classic::str_p("..") | boost::spirit::classic::ch_p('.') | _string );
_location = ( !boost::spirit::classic::ch_p('/')
>> _locationItem
>> *( boost::spirit::classic::ch_p('/') >> _locationItem )
>> !boost::spirit::classic::ch_p('/') );
_systemState = ( +( *boost::spirit::classic::space_p >>
_location >> !( boost::spirit::classic::ch_p('?') >> _argumentList ) ) );
this->start_parsers(_systemState);
}
};
};
template<typename T> void
debugNode(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node, const string &prefix = "")
{
std::map<boost::spirit::classic::parser_id, string> names;
names[boost::spirit::classic::parser_id(grammar.id_hexChar)] = "hexChar";
names[boost::spirit::classic::parser_id(grammar.id_hexCode)] = "hexCode";
names[boost::spirit::classic::parser_id(grammar.id_alphaNum)] = "alphaNum";
names[boost::spirit::classic::parser_id(grammar.id_string)] = "string";
names[boost::spirit::classic::parser_id(grammar.id_argument)] = "argument";
names[boost::spirit::classic::parser_id(grammar.id_argumentList)] = "argumentList";
names[boost::spirit::classic::parser_id(grammar.id_locationItem)] = "locationItem";
names[boost::spirit::classic::parser_id(grammar.id_location)] = "location";
names[boost::spirit::classic::parser_id(grammar.id_systemState)] = "systemState";
std::cout << prefix << names[node.value.id()] << ": " << string(node.value.begin(), node.value.end()) << std::endl;
for (size_t i = 0; i < node.children.size(); i++) {
debugNode(grammar, node.children[i], vespalib::make_string("%s %d.", prefix.c_str(), (int)i));
}
}
template<typename T> string
parseHexChar(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_hexChar);
assert(node.children.size() == 1);
assert(node.children[0].value.id().to_long() == grammar.id_hexChar);
(void) grammar;
return string(node.children[0].value.begin(), node.children[0].value.end());
}
template<typename T> char
parseHexCode(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_hexCode);
assert(node.children.size() == 3);
assert(node.children[0].value.id().to_long() == grammar.id_hexCode);
assert(node.children[1].value.id().to_long() == grammar.id_hexChar);
assert(node.children[2].value.id().to_long() == grammar.id_hexChar);
string enc = parseHexChar(grammar, node.children[1]) + parseHexChar(grammar, node.children[2]);
return (char)strtol(enc.c_str(), NULL, 16);
}
template<typename T> string
parseAlphaNum(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_alphaNum);
assert(node.children.size() == 1);
assert(node.children[0].value.id().to_long() == grammar.id_alphaNum);
(void) grammar;
return string(node.children[0].value.begin(), node.children[0].value.end());
}
template<typename T> string
parseString(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_string);
string ret;
for (size_t i = 0; i < node.children.size(); ++i) {
boost::spirit::classic::tree_node<T> &child = node.children[i];
if (child.value.id().to_long() == grammar.id_string) {
ret += " ";
}
else if (child.value.id().to_long() == grammar.id_alphaNum) {
ret += parseAlphaNum(grammar, child);
}
else if (child.value.id().to_long() == grammar.id_hexCode) {
ret += parseHexCode(grammar, child);
}
}
return ret;
}
template<typename T> void
parseArgument(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node,
std::map<string, string> &arg)
{
assert(node.value.id().to_long() == grammar.id_argument);
assert(node.children.size() == 3);
assert(node.children[0].value.id().to_long() == grammar.id_string);
assert(node.children[1].value.id().to_long() == grammar.id_argument);
assert(node.children[2].value.id().to_long() == grammar.id_string);
string key = parseString(grammar, node.children[0]);
string val = parseString(grammar, node.children[2]);
arg[key] = val;
}
template<typename T> void
parseArgumentList(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node,
std::map<string, string> &arg)
{
assert(node.value.id().to_long() == grammar.id_argumentList);
for (size_t i = 0; i < node.children.size(); ++i) {
boost::spirit::classic::tree_node<T> &child = node.children[i];
if (child.value.id().to_long() == grammar.id_argument) {
parseArgument(grammar, child, arg);
}
}
}
template<typename T> string
parseLocationItem(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_locationItem);
assert(node.children.size() == 1);
string ret;
boost::spirit::classic::tree_node<T> &child = node.children[0];
if (child.value.id().to_long() == grammar.id_locationItem) {
ret = string(child.value.begin(), child.value.end());
}
else if (child.value.id().to_long() == grammar.id_string) {
ret = parseString(grammar, child);
}
return ret;
}
template<typename T> string
parseLocation(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_location);
string ret;
for (size_t i = 0; i < node.children.size(); ++i) {
boost::spirit::classic::tree_node<T> &child = node.children[i];
if (child.value.id().to_long() == grammar.id_locationItem) {
ret += parseLocationItem(grammar, child) + "/";
}
}
return ret.substr(0, ret.size() - 1);
}
template<typename T> NodeState::UP
parseSystemState(SystemStateGrammar &grammar, boost::spirit::classic::tree_node<T> &node)
{
assert(node.value.id().to_long() == grammar.id_systemState);
NodeState::UP ret(new NodeState());
string loc, pwd;
std::map<string, string> arg;
for (size_t i = 0; i < node.children.size(); ++i) {
boost::spirit::classic::tree_node<T> &child = node.children[i];
if (child.value.id().to_long() == grammar.id_systemState) {
if (string(child.value.begin(), child.value.end()) != "?") {
if (!arg.empty()) {
ret->addChild(!loc.empty() ? loc : pwd, NodeState(arg));
}
else {
pwd = loc;
}
loc.clear();
arg.clear();
}
}
else if (child.value.id().to_long() == grammar.id_location) {
if (!pwd.empty()) {
loc = pwd + "/";
}
loc += parseLocation(grammar, child);
}
else if (child.value.id().to_long() == grammar.id_argumentList) {
parseArgumentList(grammar, child, arg);
}
}
if (!arg.empty()) {
ret->addChild(!loc.empty() ? loc : pwd, NodeState(arg));
}
return ret;
}
namespace {
vespalib::Lock _G_parseLock;
}
SystemState::UP
SystemState::newInstance(const string &state)
{
if (state.empty()) {
return SystemState::UP(new SystemState(NodeState::UP(new NodeState())));
}
try {
vespalib::LockGuard guard(_G_parseLock);
SystemStateGrammar grammar;
boost::spirit::classic::tree_parse_info<> info =
boost::spirit::classic::pt_parse(static_cast<const char *>(&*state.begin()),
static_cast<const char *>(&*state.end()),
grammar.use_parser<0>());
if (!info.full) {
string unexpected(info.stop);
unsigned int position = state.size() - unexpected.size();
if (unexpected.size() > 10) {
unexpected = unexpected.substr(0, 10);
}
LOG(error, "Unexpected token at position %u ('%s') in query '%s'.",
position, unexpected.c_str(), state.c_str());
}
else if (info.trees.size() != 1) {
LOG(error, "Parser returned %u trees, expected 1.",
(uint32_t)info.trees.size());
}
else {
return SystemState::UP(new SystemState(parseSystemState(grammar, info.trees[0])));
}
}
catch(std::exception& e) {
LOG(fatal, "SystemState::parse() internal error: %s", e.what());
}
return SystemState::UP();
}
SystemState::SystemState(NodeState::UP root) :
_root(std::move(root)),
_lock(std::make_unique<vespalib::Lock>())
{}
SystemState::~SystemState() {}
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