73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
#ifndef __RUNTIME_H__
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#define __RUNTIME_H__
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#include "platform.h"
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// Line number used for "no line number".
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#define INVALID_LINE_NUMBER 0xFFFF
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// Maximum number of variables. These fit in the zero page.
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#define MAX_VARIABLES 32
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// Location of first variable in zero page. See zeropage.s and zeropage.inc
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// in the compiler tree. They seem to use 26 bytes, so we start after that.
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// Each variable takes two bytes (int16_t).
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#define FIRST_VARIABLE 26
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// Data types for variables.
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#define DT_INT 0
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#define DT_ARRAY 1
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typedef struct {
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// The name of the variable, with the first letter in the lower byte
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// and the second letter (or nul) in the higher byte. Zero indicates
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// that this entry is unused.
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uint16_t name;
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// Data type of the variable. See DT_ constants above. This is also the
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// namespace that the variable name is in.
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uint8_t data_type;
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} VarInfo;
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extern uint16_t g_cursor_x;
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extern uint16_t g_cursor_y;
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extern uint16_t g_showing_cursor;
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extern uint8_t g_cursor_ch;
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extern VarInfo g_variables[MAX_VARIABLES];
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void initialize_runtime(void);
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void clear_for_stack(void);
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uint8_t *cursor_pos(void);
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void show_cursor(void);
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void hide_cursor(void);
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void move_cursor(int16_t x, int16_t y);
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void clear_to_eol(void);
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void home(void);
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void allocate_array(uint16_t size, uint16_t var_addr);
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void print(uint8_t *s);
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void print_char(uint8_t c);
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void print_uint(uint16_t i);
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void print_int(int16_t i);
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void print_newline(void);
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void for_statement(uint16_t line_number, uint16_t var_address, int16_t end_value, int16_t step,
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uint16_t loop_top_addr);
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uint16_t next_statement(uint16_t line_number, uint16_t var_address);
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void syntax_error(uint16_t line_number);
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void syntax_error_in_line(uint16_t line_number);
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void undefined_statement_error(uint16_t line_number);
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void redimd_array_error(uint16_t line_number);
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void gr_statement(void);
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void text_statement(void);
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void color_statement(uint16_t color);
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void plot_statement(uint16_t x, uint16_t y);
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#endif // __RUNTIME_H__
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