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/*
* Copyright ©️ 2022 Mario Forzanini <mf@marioforzanini.com>
*
* This file is part of dwrt.
*
* Dwrt is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* Dwrt is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with dwrt. If not, see <https://www.gnu.org/licenses/>.
*
*/
#define LEN(x) (sizeof((x)) / sizeof((x)[0]))
#define KNOWN_FUNCS 8
#define KNOWN_OPERATORS 5
enum lex_states {
LS_ERROR,
LS_NUMBER,
LS_PAREN,
LS_SYMBOL,
LS_WS
};
enum lexeme_types {
LE_ERROR,
LE_EOF,
LE_NUMBER,
LE_OPERATOR,
LE_SYMBOL,
LE_RPAREN,
LE_LPAREN
};
enum symbol_type {
S_FUNC,
S_LPAREN,
S_NUM,
S_OP,
S_RPAREN,
S_VAR
};
enum funcs {
COS = 0x00,
COSH,
EXP,
LOG,
SIN,
SINH,
TAN,
TANH
};
static struct func_to_bit {
char *func;
uint8_t bit;
} known_funcs[] = {
{"cos", COS},
{"cosh", COSH},
{"exp", EXP},
{"log", LOG},
{"sin", SIN},
{"sinh", SINH},
{"tan", TAN},
{"tanh", TANH}
};
enum operators {
EXPT = 0x00,
FRAC = 0x10,
MUL = 0x20,
SUB = 0x30,
SUM = 0x40
};
static struct op_to_bit {
char op;
uint8_t bit;
} known_operators[] = {
{'^', EXPT},
{'/', FRAC},
{'*', MUL},
{'-', SUB},
{'+', SUM}
};
#define IS_FUNC 0x0F;
#define IS_OP 0xF0;
typedef struct Lexeme Lexeme;
typedef struct Lexer Lexer;
typedef struct Node Node;
typedef struct Parser Parser;
typedef struct Symbol Symbol;
typedef Node* (*Derivative)(Node*, char);
struct Lexer {
size_t len; /* data length */
enum lex_states state; /* where was I? */
char *filename, *err;
char *data, *pos; /* contents of filename, current position */
};
struct Lexeme {
enum lexeme_types type;
size_t len;
char *lexeme;
};
struct Node {
Node *left, *right;
Symbol *sym;
};
struct Parser {
char *err;
Lexer *l;
Node *ast;
};
struct Symbol {
enum symbol_type type;
union {
uint8_t func;
double num;
char var;
} content;
};
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