d8e8375366
GW-BASIC reimplementation in C11, using Microsoft's open-sourced 8088 assembly as the authoritative reference. Tokenizer (CRUNCH/LIST), expression evaluator with operator precedence, all math functions (SIN, COS, TAN, ATN, SQR, LOG, EXP, RND, etc.), string functions (LEFT$, RIGHT$, MID$, CHR$, ASC, VAL, STR$, etc.), PRINT statement with comma/semicolon zones, TAB(), SPC(). Handles integer/single/double types with correct promotion, D exponent for double-precision literals, type suffixes (%, !, #), &H hex/&O octal literals, MBF conversion routines, and GW-BASIC-compatible number formatting. Platform-independent via HAL vtable; POSIX backend included.
22 lines
625 B
C
22 lines
625 B
C
#ifndef GW_EVAL_H
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#define GW_EVAL_H
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#include "types.h"
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/* Expression evaluator - recursive descent with precedence climbing */
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gw_value_t gw_eval(void); /* evaluate any expression */
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gw_value_t gw_eval_num(void); /* evaluate, require numeric */
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gw_value_t gw_eval_str(void); /* evaluate, require string */
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int16_t gw_eval_int(void); /* evaluate, require integer result */
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uint16_t gw_eval_uint16(void);
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/* Force type conversions */
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int16_t gw_to_int(gw_value_t *v);
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float gw_to_sng(gw_value_t *v);
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double gw_to_dbl(gw_value_t *v);
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/* Check for closing paren */
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void gw_expect_rparen(void);
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#endif
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