Evaluation context, an interface to the expression evaluation. More...

#include <parser_context.h>

Public Types
enum	ParserContext { NO_KEYWORD , CONFIG , DHCPDDNS , TSIG_KEY , TSIG_KEYS , ALGORITHM , DIGEST_BITS , SECRET , FORWARD_DDNS , REVERSE_DDNS , DDNS_DOMAIN , DDNS_DOMAINS , DNS_SERVER , DNS_SERVERS , CONTROL_SOCKET , LOGGERS , OUTPUT_OPTIONS , NCR_PROTOCOL , NCR_FORMAT , HOOKS_LIBRARIES }
	Defines syntactic contexts for lexical tie-ins. More...

enum	ParserType { PARSER_JSON , PARSER_DHCPDDNS , PARSER_SUB_DHCPDDNS , PARSER_TSIG_KEY , PARSER_TSIG_KEYS , PARSER_DDNS_DOMAIN , PARSER_DDNS_DOMAINS , PARSER_DNS_SERVER , PARSER_DNS_SERVERS , PARSER_HOOKS_LIBRARY }
	Defines currently supported scopes. More...

Public Member Functions
	D2ParserContext ()
	Default constructor.

virtual	~D2ParserContext ()
	destructor.

const std::string	contextName ()
	Get the syntax context name.

void	enter (const ParserContext &ctx)
	Enter a new syntactic context.

void	error (const isc::d2::location &loc, const std::string &what, size_t pos=0)
	Error handler.

void	error (const std::string &what)
	Error handler.

void	includeFile (const std::string &filename)
	Divert input to an include file.

void	leave ()
	Leave a syntactic context.

isc::data::Element::Position	loc2pos (isc::d2::location &loc)
	Converts bison's position to one understood by isc::data::Element.

isc::data::ElementPtr	parseFile (const std::string &filename, ParserType parser_type)
	Run the parser on the file specified.

isc::data::ElementPtr	parseString (const std::string &str, ParserType parser_type)
	Run the parser on the string specified.

void	require (const std::string &name, isc::data::Element::Position open_loc, isc::data::Element::Position close_loc)
	Check if a required parameter is present.

void	scanEnd ()
	Method called after the last tokens are scanned.

void	scanFileBegin (FILE *f, const std::string &filename, ParserType type)
	Method called before scanning starts on a file.

void	scanStringBegin (const std::string &str, ParserType type)
	Method called before scanning starts on a string.

void	unique (const std::string &name, isc::data::Element::Position loc)
	Check if a parameter is already present.

void	warnAboutExtraCommas (const isc::d2::location &loc)
	Warning for extra commas.

void	warning (const isc::d2::location &loc, const std::string &what)
	Warning handler.

Static Public Member Functions
static void	fatal (const std::string &what)
	Fatal error handler.

Public Attributes
ParserContext	ctx_
	Current syntactic context.

std::string	file_
	File name.

std::vector< std::string >	files_
	File name stack.

isc::d2::location	loc_
	Location of the current token.

std::vector< isc::d2::location >	locs_
	Location stack.

FILE *	sfile_
	sFile (aka FILE)

std::vector< FILE * >	sfiles_
	sFile (aka FILE) stack

std::vector< isc::data::ElementPtr >	stack_
	JSON elements being parsed.

std::vector< struct yy_buffer_state * >	states_
	Lexer state stack.

Detailed Description

Evaluation context, an interface to the expression evaluation.

Definition at line 35 of file d2/parser_context.h.

Member Enumeration Documentation

◆ ParserContext

enum isc::d2::D2ParserContext::ParserContext

Defines syntactic contexts for lexical tie-ins.

Enumerator
NO_KEYWORD	This one is used in pure JSON mode. Used while parsing top level (contains DhcpDdns).
CONFIG	Used while parsing content of DhcpDdns.
DHCPDDNS	Used while parsing content of a tsig-key.
TSIG_KEY	Used while parsing a list of tsig-keys.
TSIG_KEYS	Used while parsing content of DhcpDdns/tsig-keys/algorithm.
ALGORITHM	Used while parsing content of DhcpDdns/tsig-keys/digest-bits.
DIGEST_BITS	Used while parsing content of DhcpDdns/tsig-keys/secret.
SECRET	Used while parsing content of DhcpDdns/forward-ddns.
FORWARD_DDNS	Used while parsing content of DhcpDdns/reverse-ddns.
REVERSE_DDNS	Used while parsing content of a ddns-domain.
DDNS_DOMAIN	Used while parsing a list of ddns-domains.
DDNS_DOMAINS	Used while parsing content of a dns-server.
DNS_SERVER	Used while parsing content of list of dns-servers.
DNS_SERVERS	Used while parsing content of a control-socket.
CONTROL_SOCKET
LOGGERS	Used while parsing DhcpDdns/loggers structures.
OUTPUT_OPTIONS	Used while parsing DhcpDdns/loggers/output-options structures.
NCR_PROTOCOL	Used while parsing DhcpDdns/ncr-protocol.
NCR_FORMAT	Used while parsing DhcpDdns/ncr-format.
HOOKS_LIBRARIES	Used while parsing DhcpDdns/hooks-libraries.

Definition at line 214 of file d2/parser_context.h.

◆ ParserType

enum isc::d2::D2ParserContext::ParserType

Defines currently supported scopes.

D2Parser may eventually support multiple levels of parsing scope. Currently it supports only the D2 module scope which expects the data to be parsed to be a map containing the DhcpDdns element and its constituents.

Enumerator
PARSER_JSON	This parser will parse the content as generic JSON. Used for parsing top level (contains DhcpDdns)
PARSER_DHCPDDNS	Used for parsing content of DhcpDdns.
PARSER_SUB_DHCPDDNS	Used for parsing content of a TSIG key.
PARSER_TSIG_KEY	Used for parsing a list of TSIG Keys.
PARSER_TSIG_KEYS	Used for parsing content of a DDNS Domain.
PARSER_DDNS_DOMAIN	Used for parsing a list a DDNS Domains.
PARSER_DDNS_DOMAINS	Used for parsing content of a DNS Server.
PARSER_DNS_SERVER	Used for parsing a list of DNS servers.
PARSER_DNS_SERVERS	Used for parsing content of hooks libraries.
PARSER_HOOKS_LIBRARY

Definition at line 46 of file d2/parser_context.h.

Constructor & Destructor Documentation

◆ D2ParserContext()

isc::d2::D2ParserContext::D2ParserContext ( )

Default constructor.

Definition at line 22 of file d2/parser_context.cc.

◆ ~D2ParserContext()

isc::d2::D2ParserContext::~D2ParserContext ( )

virtual

destructor.

Definition at line 27 of file d2/parser_context.cc.

Member Function Documentation

◆ contextName()

const std::string isc::d2::D2ParserContext::contextName ( )

Get the syntax context name.

Returns: printable name of the context.

Definition at line 158 of file d2/parser_context.cc.

References ALGORITHM, CONFIG, CONTROL_SOCKET, ctx_, DDNS_DOMAIN, DDNS_DOMAINS, DHCPDDNS, DIGEST_BITS, DNS_SERVER, DNS_SERVERS, FORWARD_DDNS, HOOKS_LIBRARIES, LOGGERS, NCR_FORMAT, NCR_PROTOCOL, NO_KEYWORD, OUTPUT_OPTIONS, REVERSE_DDNS, SECRET, TSIG_KEY, and TSIG_KEYS.

Referenced by isc::d2::D2Parser::parse(), require(), and unique().

◆ enter()

void isc::d2::D2ParserContext::enter ( const ParserContext & ctx )

Enter a new syntactic context.

Entering a new syntactic context is useful in several ways. First, it allows the parser to avoid conflicts. Second, it allows the lexer to return different tokens depending on context (e.g. if "name" string is detected, the lexer will return STRING token if in JSON mode or NAME if in TSIG_KEY mode. Finally, the syntactic context allows the error message to be more descriptive if the input string does not parse properly.

Parameters

ctx	the syntactic context to enter into

Definition at line 140 of file d2/parser_context.cc.

References ctx_.

Referenced by isc::d2::D2Parser::parse().

◆ error() [1/2]

void isc::d2::D2ParserContext::error	(	const isc::d2::location &	loc,
		const std::string &	what,
		size_t	pos = `0`
	)

Error handler.

Note: The optional position for an error in a string begins by 1 so the caller should add 1 to the position of the C++ string.

Parameters

loc	location within the parsed file where the problem was experienced.
what	string explaining the nature of the error.
pos	optional position for in string errors.

Exceptions

D2ParseError

Definition at line 74 of file d2/parser_context.cc.

References isc_throw.

◆ error() [2/2]

void isc::d2::D2ParserContext::error ( const std::string & what )

Error handler.

This is a simplified error reporting tool for reporting parsing errors.

Parameters

what	string explaining the nature of the error.

Exceptions

D2ParseError

Definition at line 86 of file d2/parser_context.cc.

References isc_throw.

◆ fatal()

void isc::d2::D2ParserContext::fatal ( const std::string & what )

static

Fatal error handler.

This is for should not happen but fatal errors. Used by YY_FATAL_ERROR macro so required to be static.

Parameters

what	string explaining the nature of the error.

Exceptions

D2ParseError

Definition at line 92 of file d2/parser_context.cc.

References isc_throw.

Referenced by leave().

◆ includeFile()

void D2ParserContext::includeFile ( const std::string & filename )

Divert input to an include file.

Parameters

filename file to be included

Definition at line 3671 of file d2_lexer.cc.

References BEGIN, isc::db::fatal, file_, files_, INITIAL, loc_, locs_, sfile_, sfiles_, states_, and YY_CURRENT_BUFFER.

◆ leave()

void isc::d2::D2ParserContext::leave ( )

Leave a syntactic context.

Exceptions

isc::Unexpected if unbalanced

Definition at line 147 of file d2/parser_context.cc.

References ctx_, and fatal().

Referenced by isc::d2::D2Parser::parse().

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◆ loc2pos()

isc::data::Element::Position isc::d2::D2ParserContext::loc2pos ( isc::d2::location & loc )

Converts bison's position to one understood by isc::data::Element.

Convert a bison location into an element position (take the begin, the end is lost)

Parameters

loc	location in bison format

Returns: Position in format accepted by Element

Definition at line 98 of file d2/parser_context.cc.

Referenced by isc::d2::D2Parser::parse().

◆ parseFile()

isc::data::ElementPtr isc::d2::D2ParserContext::parseFile	(	const std::string &	filename,
		ParserType	parser_type
	)

Run the parser on the file specified.

This method parses specified file. Depending on the value of parser_type, parser may either check only that the input is valid JSON, or may do more specific syntax checking. See ParserType for supported syntax checkers.

Parameters

filename	file to be parsed
parser_type	specifies expected content

Returns: Element structure representing parsed text.

Definition at line 39 of file d2/parser_context.cc.

References isc_throw, and scanFileBegin().

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◆ parseString()

isc::data::ElementPtr isc::d2::D2ParserContext::parseString	(	const std::string &	str,
		ParserType	parser_type
	)

Run the parser on the string specified.

This method parses specified string. Depending on the value of parser_type, parser may either check only that the input is valid JSON, or may do more specific syntax checking. See ParserType for supported syntax checkers.

Parameters