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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#ifndef _NP_LEX_H_
#define _NP_LEX_H_ 1
#include <sys/types.h>
#include <os/np.h>
#define TOKEN_BEGIN "begin"
#define TOKEN_PROC "proc"
#define TOKEN_END "end"
/*
* Represents the various token types that are
* possible
*/
typedef enum {
/* Symbols */
TT_LPAREN,
TT_RPAREN,
/* Keywords */
TT_BEGIN,
TT_PROC,
TT_END,
} tt_t;
/*
* Represents a lexer token
*
* @token: Token type
*/
struct lex_token {
tt_t token;
};
/*
* Represents the lexer state machine
*
* @work: Current compiler work unit
* @tok: Current token
* @source_idx: Byte index into source stream
*/
struct lexer_state {
struct np_work *work;
struct lex_token tok;
size_t source_idx;
};
/*
* Initialize the lexer state machine into
* a known state
*
* @state: Lexer state machine to initialize
* @work: Work to initialize state machine with
*
* Returns zero on success, otherwise a less than
* zero value on failure
*/
int lex_init(struct lexer_state *state, struct np_work *work);
/*
* "Nom" a token from the source input and advance
* to the next.
*
* @work: Current work
* @res: Result is written here
*
* Returns zero on success, otherwise a less than
* zero value on failure
*/
int lex_nom(struct np_work *work, struct lex_token *res);
#endif /* !_NP_LEX_H_ */
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