Andrew Kesterson
591858334b
- Added the ability to force immediate mode processing (calculator mode) by beginning a line with = - Expanded parser testing - Expression execution seems to be broken now, everything is returning error code 0 and not returning results
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
#ifndef _BASIC_H_
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#define _BASIC_H_
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#define BASIC_MAX_LINES 1000
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#define BASIC_MAX_LINE_LENGTH 256
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#define BASIC_OPTP_ADD 1 /* Add */
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#define BASIC_OPTP_SUB 2 /* Subtract */
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#define BASIC_OPTP_MUL 3 /* Multiply */
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#define BASIC_OPTP_DIV 4 /* Divide */
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#define BASIC_OPTP_MOD 5 /* Modulus */
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#define BASIC_OPTP_EQL 6 /* Equality test */
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#define BASIC_OPTP_ASN 7 /* Assignment */
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#define BASIC_OPTP_STOR 8 /* Store line for later */
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#define BASIC_LVAL_EXPR 0
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#define BASIC_LVAL_VAR 1
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#define BASIC_LVAL_CONST 2
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#define BASIC_RVAL_EXPR 3
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#define BASIC_RVAL_VAR 4
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#define BASIC_RVAL_CONST 5
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#define BASIC_RVAL_PTR 6 /* Only used internally */
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#define BASIC_PARSE_FOUND_LVAL 1
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#define BASIC_PARSE_FOUND_RVAL 2
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#define BASIC_PARSE_FIRSTTOKEN 4
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#define BASIC_ERR_SYNTAX_MULTIPLE_LVALUES 1
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#define BASIC_ERR_SYNTAX_TOKEN_LENGTH 2
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#define BASIC_ERR_SYNTAX_GENERAL 3
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#define BASIC_ERR_SYNTAX_MULTIPLE_RVALUES 4
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#define BASIC_ERR_INVALID_ARGUMENTS 5
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#define BASIC_ERR_INTERNAL_NULLPOINTER 6
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#define BASIC_ERR_INTERNAL_MEMORY 7
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#define BASIC_ERR_INTERNAL_UNDEFINED_BEHAVIOR 8
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#define BASIC_ERR_INTERNAL_UNIMPLEMENTED 9
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#define BASIC_ERR_MATH_DBZ 10
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#define BASIC_TOKENIZER_TOKENS "+-/%*="
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#define BASIC_TOKENIZER_MAX_LENGTH 512
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#define BASIC_VARNAME_MAX_LENGTH 16
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struct basic_line {
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int lineno;
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char content[BASIC_MAX_LINE_LENGTH];
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struct basic_line *nextline;
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};
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typedef struct basic_line basic_line;
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struct basic_program {
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char name[128];
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basic_line *first;
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};
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typedef struct basic_program basic_program;
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union basic_value {
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char c;
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int i;
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unsigned int uint;
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/* we don't handle floats yet. need to implement Fcomp, fpushf, fpushd.
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* float f;
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*/
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char *str;
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void *ptr;
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};
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typedef union basic_value basic_value;
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struct basic_expr {
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char type;
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char lval_type;
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char rval_type;
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char pad;
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basic_value lval;
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basic_value rval;
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};
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typedef struct basic_expr basic_expr;
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#define BASIC_VARFLAG_INIT 1
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#define BASIC_VARFLAG_TINT 2
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#define BASIC_VARFLAG_TSTR 4
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struct basic_variable {
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char *name;
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char flags;
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basic_value value;
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};
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typedef struct basic_variable basic_variable;
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#define BASIC_CONST_TRUE 1
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#define BASIC_CONST_FALSE 0
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extern int basic_errno;
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void basic_repl(basic_program *program);
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basic_expr *basic_parse_expr(char *);
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#endif /* _BASIC_H_ */
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