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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_LEX_H
#define ISC_LEX_H 1
/*****
***** Module Info
*****/
/*! \file isc/lex.h
* \brief The "lex" module provides a lightweight tokenizer. It can operate
* on files or buffers, and can handle "include". It is designed for
* parsing of DNS master files and the BIND configuration file, but
* should be general enough to tokenize other things, e.g. HTTP.
*
* \li MP:
* No synchronization is provided. Clients must ensure exclusive
* access.
*
* \li Reliability:
* No anticipated impact.
*
* \li Resources:
* TBS
*
* \li Security:
* No anticipated impact.
*
* \li Standards:
* None.
*/
/***
*** Imports
***/
#include <stdbool.h>
#include <stdio.h>
#include <isc/lang.h>
#include <isc/region.h>
#include <isc/types.h>
ISC_LANG_BEGINDECLS
/***
*** Options
***/
/*@{*/
/*!
* Various options for isc_lex_gettoken().
*/
#define ISC_LEXOPT_EOL 0x01 /*%< Want end-of-line token. */
#define ISC_LEXOPT_EOF 0x02 /*%< Want end-of-file token. */
#define ISC_LEXOPT_INITIALWS 0x04 /*%< Want initial whitespace. */
#define ISC_LEXOPT_NUMBER 0x08 /*%< Recognize numbers. */
#define ISC_LEXOPT_QSTRING 0x10 /*%< Recognize qstrings. */
/*@}*/
/*@{*/
/*!
* The ISC_LEXOPT_DNSMULTILINE option handles the processing of '(' and ')' in
* the DNS master file format. If this option is set, then the
* ISC_LEXOPT_INITIALWS and ISC_LEXOPT_EOL options will be ignored when
* the paren count is > 0. To use this option, '(' and ')' must be special
* characters.
*/
#define ISC_LEXOPT_DNSMULTILINE 0x20 /*%< Handle '(' and ')'. */
#define ISC_LEXOPT_NOMORE 0x40 /*%< Want "no more" token. */
#define ISC_LEXOPT_CNUMBER 0x80 /*%< Recognize octal and hex. */
#define ISC_LEXOPT_ESCAPE 0x100 /*%< Recognize escapes. */
#define ISC_LEXOPT_QSTRINGMULTILINE 0x200 /*%< Allow multiline "" strings */
#define ISC_LEXOPT_OCTAL 0x400 /*%< Expect a octal number. */
#define ISC_LEXOPT_BTEXT 0x800 /*%< Bracketed text. */
/*@}*/
/*@{*/
/*!
* Various commenting styles, which may be changed at any time with
* isc_lex_setcomments().
*/
#define ISC_LEXCOMMENT_C 0x01
#define ISC_LEXCOMMENT_CPLUSPLUS 0x02
#define ISC_LEXCOMMENT_SHELL 0x04
#define ISC_LEXCOMMENT_DNSMASTERFILE 0x08
/*@}*/
/***
*** Types
***/
/*! Lex */
typedef char isc_lexspecials_t[256];
/* Tokens */
typedef enum {
isc_tokentype_unknown = 0,
isc_tokentype_string = 1,
isc_tokentype_number = 2,
isc_tokentype_qstring = 3,
isc_tokentype_eol = 4,
isc_tokentype_eof = 5,
isc_tokentype_initialws = 6,
isc_tokentype_special = 7,
isc_tokentype_nomore = 8,
isc_tokentype_btext = 8
} isc_tokentype_t;
typedef union {
char as_char;
unsigned long as_ulong;
isc_region_t as_region;
isc_textregion_t as_textregion;
void * as_pointer;
} isc_tokenvalue_t;
typedef struct isc_token {
isc_tokentype_t type;
isc_tokenvalue_t value;
} isc_token_t;
/***
*** Functions
***/
isc_result_t
isc_lex_create(isc_mem_t *mctx, size_t max_token, isc_lex_t **lexp);
/*%<
* Create a lexer.
*
* 'max_token' is a hint of the number of bytes in the largest token.
*
* Requires:
*\li '*lexp' is a valid lexer.
*
* Ensures:
*\li On success, *lexp is attached to the newly created lexer.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*/
void
isc_lex_destroy(isc_lex_t **lexp);
/*%<
* Destroy the lexer.
*
* Requires:
*\li '*lexp' is a valid lexer.
*
* Ensures:
*\li *lexp == NULL
*/
unsigned int
isc_lex_getcomments(isc_lex_t *lex);
/*%<
* Return the current lexer commenting styles.
*
* Requires:
*\li 'lex' is a valid lexer.
*
* Returns:
*\li The commenting styles which are currently allowed.
*/
void
isc_lex_setcomments(isc_lex_t *lex, unsigned int comments);
/*%<
* Set allowed lexer commenting styles.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'comments' has meaningful values.
*/
void
isc_lex_getspecials(isc_lex_t *lex, isc_lexspecials_t specials);
/*%<
* Put the current list of specials into 'specials'.
*
* Requires:
*\li 'lex' is a valid lexer.
*/
void
isc_lex_setspecials(isc_lex_t *lex, isc_lexspecials_t specials);
/*!<
* The characters in 'specials' are returned as tokens. Along with
* whitespace, they delimit strings and numbers.
*
* Note:
*\li Comment processing takes precedence over special character
* recognition.
*
* Requires:
*\li 'lex' is a valid lexer.
*/
isc_result_t
isc_lex_openfile(isc_lex_t *lex, const char *filename);
/*%<
* Open 'filename' and make it the current input source for 'lex'.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li filename is a valid C string.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY Out of memory
*\li #ISC_R_NOTFOUND File not found
*\li #ISC_R_NOPERM No permission to open file
*\li #ISC_R_FAILURE Couldn't open file, not sure why
*\li #ISC_R_UNEXPECTED
*/
isc_result_t
isc_lex_openstream(isc_lex_t *lex, FILE *stream);
/*%<
* Make 'stream' the current input source for 'lex'.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'stream' is a valid C stream.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY Out of memory
*/
isc_result_t
isc_lex_openbuffer(isc_lex_t *lex, isc_buffer_t *buffer);
/*%<
* Make 'buffer' the current input source for 'lex'.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'buffer' is a valid buffer.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY Out of memory
*/
isc_result_t
isc_lex_close(isc_lex_t *lex);
/*%<
* Close the most recently opened object (i.e. file or buffer).
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE No more input sources
*/
isc_result_t
isc_lex_gettoken(isc_lex_t *lex, unsigned int options, isc_token_t *tokenp);
/*%<
* Get the next token.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'lex' has an input source.
*
*\li 'options' contains valid options.
*
*\li '*tokenp' is a valid pointer.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_UNEXPECTEDEND
*\li #ISC_R_NOMEMORY
*
* These two results are returned only if their corresponding lexer
* options are not set.
*
*\li #ISC_R_EOF End of input source
*\li #ISC_R_NOMORE No more input sources
*/
isc_result_t
isc_lex_getmastertoken(isc_lex_t *lex, isc_token_t *token,
isc_tokentype_t expect, bool eol);
/*%<
* Get the next token from a DNS master file type stream. This is a
* convenience function that sets appropriate options and handles quoted
* strings and end of line correctly for master files. It also ungets
* unexpected tokens. If `eol` is set then expect end-of-line otherwise
* eol is a error.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'token' is a valid pointer
*
* Returns:
*
* \li any return code from isc_lex_gettoken().
*/
isc_result_t
isc_lex_getoctaltoken(isc_lex_t *lex, isc_token_t *token, bool eol);
/*%<
* Get the next token from a DNS master file type stream. This is a
* convenience function that sets appropriate options and handles end
* of line correctly for master files. It also ungets unexpected tokens.
* If `eol` is set then expect end-of-line otherwise eol is a error.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'token' is a valid pointer
*
* Returns:
*
* \li any return code from isc_lex_gettoken().
*/
void
isc_lex_ungettoken(isc_lex_t *lex, isc_token_t *tokenp);
/*%<
* Unget the current token.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'lex' has an input source.
*
*\li 'tokenp' points to a valid token.
*
*\li There is no ungotten token already.
*/
void
isc_lex_getlasttokentext(isc_lex_t *lex, isc_token_t *tokenp, isc_region_t *r);
/*%<
* Returns a region containing the text of the last token returned.
*
* Requires:
*\li 'lex' is a valid lexer.
*
*\li 'lex' has an input source.
*
*\li 'tokenp' points to a valid token.
*
*\li A token has been gotten and not ungotten.
*/
char *
isc_lex_getsourcename(isc_lex_t *lex);
/*%<
* Return the input source name.
*
* Requires:
*\li 'lex' is a valid lexer.
*
* Returns:
* \li source name or NULL if no current source.
*\li result valid while current input source exists.
*/
unsigned long
isc_lex_getsourceline(isc_lex_t *lex);
/*%<
* Return the input source line number.
*
* Requires:
*\li 'lex' is a valid lexer.
*
* Returns:
*\li Current line number or 0 if no current source.
*/
isc_result_t
isc_lex_setsourcename(isc_lex_t *lex, const char *name);
/*%<
* Assigns a new name to the input source.
*
* Requires:
*
* \li 'lex' is a valid lexer.
*
* Returns:
* \li #ISC_R_SUCCESS
* \li #ISC_R_NOMEMORY
* \li #ISC_R_NOTFOUND - there are no sources.
*/
isc_result_t
isc_lex_setsourceline(isc_lex_t *lex, unsigned long line);
/*%<
* Assigns a new line number to the input source. This can be used
* when parsing a buffer that's been excerpted from the middle a file,
* allowing logged messages to display the correct line number,
* rather than the line number within the buffer.
*
* Requires:
*
* \li 'lex' is a valid lexer.
*
* Returns:
* \li #ISC_R_SUCCESS
* \li #ISC_R_NOTFOUND - there are no sources.
*/
bool
isc_lex_isfile(isc_lex_t *lex);
/*%<
* Return whether the current input source is a file.
*
* Requires:
*\li 'lex' is a valid lexer.
*
* Returns:
* \li #true if the current input is a file,
*\li #false otherwise.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_LEX_H */