132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
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expr.h defines the structure of an expression node,
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and the operations that can be performed upon it.
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Note some things about this file that you should emulate:
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- Every symbol in expr.[ch] begins with expr_.
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- Use enumerations to define variant types.
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- Build complex trees one node at a time.
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- Define methods with recurse over those trees.
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*/
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#ifndef EXPR_H
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#define EXPR_H
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#include "symbol_map.h"
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#include <stdio.h>
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#include <stdlib.h>
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// Expressions
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typedef enum {
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EXPR_ADD,
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EXPR_ARRAY,
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EXPR_DIVIDE,
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EXPR_EXPONENTIAL,
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EXPR_EQUAL_EQUAL,
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EXPR_FLOAT_LITERAL,
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EXPR_GREATER_THAN,
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EXPR_GREATER_THAN_OR_EQUAL,
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EXPR_INTEGER_LITERAL,
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EXPR_LESS_THAN,
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EXPR_LESS_THAN_OR_EQUAL,
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EXPR_MULTIPLY,
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EXPR_NAME,
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EXPR_NOT_EQUAL,
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EXPR_STRING_LITERAL,
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EXPR_SUBSCRIPT,
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EXPR_SUBTRACT,
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} expr_t;
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struct expr {
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expr_t kind;
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struct expr *left;
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struct expr *right;
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const char *name;
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int integer_value;
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float float_value;
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const char *string_literal;
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};
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typedef enum {
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TYPE_ALPHANUMERIC,
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TYPE_IMPLIED_DECIMAL,
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TYPE_NUMERIC,
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TYPE_SIGNED_NUMERIC
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} type_t;
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typedef enum { LEVEL_0, LEVEL_1, LEVEL_2, LEVEL_3 } computation_level_t;
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struct type {
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type_t kind;
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struct type *subtype;
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int limit;
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computation_level_t level;
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};
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struct decl {
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struct expr *name;
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struct type *type;
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struct expr *value;
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struct stmt *code;
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struct decl *next;
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};
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typedef enum {
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STMT_BLOCK,
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STMT_DECL,
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STMT_EXPR,
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STMT_IF,
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STMT_PRINT,
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STMT_SECTION,
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STMT_COMPUTE,
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STMT_MOVE,
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STMT_END_EXECUTION,
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} stmt_t;
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struct stmt {
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stmt_t kind;
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struct decl *decl;
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struct expr *init_expr;
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struct expr *expr;
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struct expr *next_expr;
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struct stmt *body;
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struct stmt *else_body;
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struct stmt *next;
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};
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struct stmt *stmt_create(stmt_t kind, struct decl *decl, struct expr *init_expr,
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struct expr *expr, struct expr *next_expr,
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struct stmt *body, struct stmt *else_body,
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struct stmt *next);
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struct decl *decl_create(struct expr *name, struct type *type,
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struct expr *value, struct stmt *code,
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struct decl *next);
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struct expr *expr_create_name(const char *name);
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struct expr *expr_create_integer_literal(int i);
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struct expr *expr_create_float_literal(float f);
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struct expr *expr_create_string_literal(const char *str);
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struct expr *expr_create(expr_t kind, struct expr *left, struct expr *right);
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struct type *type_create(type_t kind, struct type *sub);
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void scope_bind(const char *name, struct expr *sym);
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struct expr *scope_lookup(const char *name);
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void stmt_print(struct stmt *e);
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void decl_print(struct decl *d);
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void expr_print(struct expr *e);
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void ast_print(struct stmt *e);
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void stmt_evaluate(struct stmt *e);
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void decl_evaluate(struct decl *e);
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void stmt_evaluate_print(struct expr *e);
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void decl_subscript_evaluate(struct expr *e, float value);
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float expr_evaluate(struct expr *e);
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struct expr *expr_sub_evaluate(struct expr *e);
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float expr_subscript_evaluate(struct expr *e);
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const char *expr_string_evaluate(struct expr *e);
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void expr_delete(struct expr *e);
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void close_parser();
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#endif
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