libabacus/include/table.h

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#ifndef LIBABACUS_TABLE_H
#define LIBABACUS_TABLE_H
#include "ht.h"
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#include "result.h"
#include "custom.h"
/**
* A struct that represents a structure
* similar to a symbol table. This structure
* is used to keep track of definitions such
* as types, functions, and variables in an
* environment with scopes.
*/
struct libab_table_s {
/**
* The "parent" scope of this table.
*/
struct libab_table_s* parent;
/**
* The hash table used to store the data.
*/
ht table;
};
/**
* Enum that represents the type of a table
* entry.
*/
enum libab_table_entry_variant_e {
ENTRY_VALUE,
ENTRY_TYPE,
ENTRY_OP,
ENTRY_FUN
};
/**
* An entry in the table.
*/
struct libab_table_entry_s {
/**
* The type of this entry.
*/
enum libab_table_entry_variant_e variant;
/**
* Union that holds the various types of
* data that this entry could hold.
*/
union {
libab_operator op;
libab_function function;
} data_u;
};
typedef struct libab_table_s libab_table;
typedef enum libab_table_entry_variant_e libab_table_entry_variant;
typedef struct libab_table_entry_s libab_table_entry;
/**
* Initializes the given table.
* @param table the table to initialize.
*/
void libab_table_init(libab_table* table);
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/**
* Searches for the given string in the table.
* @param table the table to search.
* @param string the string to search for.
* @return the table entry, or NULL if an entry was not found.
*/
libab_table_entry* libab_table_search(libab_table* table, const char* string);
/**
* Searches for the given string in the table, returning a value only
* if it is an operator.
* @param table the table to search.
* @param string the string to search for.
* @return the found operator, or NULL if it was not found.
*/
libab_operator* libab_table_search_operator(libab_table* table, const char* string);
/**
* Searches for the given string in the table, returning a value only
* if it is a function.
* @param table the table to search.
* @param string the string to search for.
* @return the found function, or NULL if it was not found.
*/
libab_function* libab_table_search_function(libab_table* table, const char* string);
/**
* Stores the given entry in the table under the given key.
* @param table the table to store the entry into.
* @param string the string to use as the key.
* @param entry the new entry to put into the table.
* @return the result of the insertion, which could be LIBAB_MALLOC.
*/
libab_result libab_table_put(libab_table* table, const char* string, libab_table_entry* entry);
/**
* Frees the resources allocated by the
* given table.
* @param table the table to free.
*/
void libab_table_free(libab_table* table);
#endif