Experiments/libabacus
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Make operators simply aliases to functions.

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This commit is contained in:
Danila Fedorin 2018-06-01 15:24:55 -07:00
parent 6cc43449c5
commit 5fec3bd63c
6 changed files with 50 additions and 102 deletions
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14
include/custom.h
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@ -61,10 +61,6 @@ struct libab_operator_s {
* each operator.
*/
enum libab_operator_variant_e variant;
/**
* The type of this operator.
*/
libab_ref type;
/**
* The precedence of the operator.
*/
@ -74,9 +70,9 @@ struct libab_operator_s {
*/
int associativity;
/**
* The behavior of this operator.
* The function called by this operator.
*/
struct libab_behavior_s behavior;
const char* function;
};
/**
@ -132,12 +128,10 @@ void libab_behavior_free(libab_behavior* behavior);
* @param precedence the precedence of the operator.
* @param associativity the associativity (left = -1, right = 1) of the
* operator.
* @param type the type of the operator.
* @param func the function used to implement the operator.
* @param function the function this operator represents.
*/
void libab_operator_init(libab_operator* op, libab_operator_variant variant,
int precedence, int associativity, libab_ref* type,
libab_function_ptr func);
int precedence, int associativity, const char* function);
/**
* Frees the given operator.
* @param op the operator to free.

18
include/libabacus.h
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@ -78,38 +78,32 @@ libab_result libab_init(libab* ab, void* (*parse_function)(const char*),
* @param op the operator string to register.
* @param precedence the precedence of the operator.
* @param associativity the associativity of the operator.
* @param type the type of this operator.
* @param func the function that describes the functionality of the operator.
* @param function the function this operator calls.
* @return the result of the initialization.
*/
libab_result libab_register_operator_infix(libab* ab, const char* op,
int precedence, int associativity,
libab_ref* type,
libab_function_ptr func);
const char* function);
/**
* Registers an operation with libabacus that appears
* before its operand.
* @param ab the libabacus instance to register the operator with.
* @param op the operator string to register.
* @param type the type of this operator.
* @param func the function that describes the functionality of the operator.
* @param function the function this operator calls.
* @return the result of the registration.
*/
libab_result libab_register_operator_prefix(libab* ab, const char* op,
libab_ref* type,
libab_function_ptr func);
const char* function);
/**
* Registers an operation with libabacus that appears
* after its operand.
* @param ab the libabacus instance to register the operator with.
* @param op the operator string to register.
* @param type the type of this operator.
* @param func the function that describes the functionality of the operator.
* @param function the function this operator calls.
* @return the result of the registration.
*/
libab_result libab_register_operator_postfix(libab* ab, const char* op,
libab_ref* type,
libab_function_ptr func);
const char* function);
/**
* Registers a function with libabacus.

9
src/custom.c
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@ -18,18 +18,15 @@ void libab_behavior_free(libab_behavior* behavior) {
}
void libab_operator_init(libab_operator* op, libab_operator_variant variant,
int precedence, int associativity, libab_ref* type,
libab_function_ptr func) {
int precedence, int associativity, const char* function) {
op->variant = variant;
op->precedence = precedence;
op->associativity = associativity;
libab_ref_copy(type, &op->type);
libab_behavior_init_internal(&op->behavior, func);
op->function = function;
}
void libab_operator_free(libab_operator* op) {
libab_ref_free(&op->type);
libab_behavior_free(&op->behavior);
}
libab_result _function_init(libab_function* function, libab_ref* scope) {

16
src/interactive.c
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@ -75,14 +75,14 @@ libab_result register_functions(libab* ab) {
TRY(libab_register_function(ab, "atan", &trig_type, function_atan));
TRY(libab_register_function(ab, "atan2", &atan2_type, function_atan2));
TRY(libab_register_operator_infix(ab, "+", 0, -1, &atan2_type,
function_operator));
TRY(libab_register_operator_infix(ab, "-", 0, -1, &atan2_type,
function_operator));
TRY(libab_register_operator_infix(ab, "*", 1, -1, &atan2_type,
function_operator));
TRY(libab_register_operator_infix(ab, "/", 1, -1, &atan2_type,
function_operator));
TRY(libab_register_function(ab, "plus", &atan2_type, function_operator));
TRY(libab_register_function(ab, "minus", &atan2_type, function_operator));
TRY(libab_register_function(ab, "times", &atan2_type, function_operator));
TRY(libab_register_function(ab, "divide", &atan2_type, function_operator));
TRY(libab_register_operator_infix(ab, "+", 0, -1, "plus"));
TRY(libab_register_operator_infix(ab, "-", 0, -1, "minus"));
TRY(libab_register_operator_infix(ab, "*", 1, -1, "times"));
TRY(libab_register_operator_infix(ab, "/", 1, -1, "divide"));
libab_ref_free(&trig_type);
libab_ref_free(&atan2_type);

72
src/interpreter.c
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@ -636,66 +636,36 @@ libab_result _interpreter_try_call(struct interpreter_state* state,
return result;
}
/**
* Casts the paramters of an operator, and calls it.
* @param state the state in which to perform the call on the operator.
* @param to_call the operator to call.
* @param params the parameters to give to the operator.
* @param new_types the types to which to cast the parameters.
* @param into the reference into which to store the result of the cold.
* @return the result of the call.
*/
libab_result _interpreter_cast_and_perform_operator_call(
struct interpreter_state* state,
libab_operator* to_call, libab_ref_vec* params, libab_ref_vec* new_types,
libab_ref* into) {
libab_result result = LIBAB_SUCCESS;
libab_ref_vec new_params;
libab_ref_null(into);
result = libab_ref_vec_init(&new_params);
if (result == LIBAB_SUCCESS) {
result = _interpreter_cast_params(params, new_types, &new_params);
if (result == LIBAB_SUCCESS) {
libab_ref_free(into);
result =
_interpreter_call_behavior(state, &to_call->behavior, params, into);
}
libab_ref_vec_free(&new_params);
}
return result;
}
libab_result _interpreter_run(struct interpreter_state* state, libab_tree* tree,
libab_ref* into, libab_ref* scope,
int force_scope);
libab_result _interpreter_require_value(libab_ref* scope, const char* name,
libab_ref* into) {
libab_result result = LIBAB_SUCCESS;
libab_table_search_value(libab_ref_get(scope), name, into);
if(libab_ref_get(into) == NULL) {
result = LIBAB_UNEXPECTED;
}
return result;
}
libab_result _interpreter_call_operator(struct interpreter_state* state,
libab_operator* to_call,
libab_ref* into, libab_ref* scope,
...) {
va_list args;
libab_result result = LIBAB_SUCCESS;
libab_ref function_value;
libab_ref_vec params;
libab_ref_vec new_types;
libab_ref temp;
libab_parsetype* operator_type;
libab_ref_null(&function_value);
va_start(args, scope);
operator_type = libab_ref_get(&to_call->type);
result = libab_ref_vec_init(&params);
if (result == LIBAB_SUCCESS) {
result = libab_ref_vec_init(&new_types);
if (result != LIBAB_SUCCESS) {
libab_ref_vec_free(&params);
}
}
if (result == LIBAB_SUCCESS) {
/* Get first parameter. */
result =
_interpreter_run(state, va_arg(args, libab_tree*), &temp, scope, 0);
@ -705,6 +675,7 @@ libab_result _interpreter_call_operator(struct interpreter_state* state,
libab_ref_free(&temp);
/* If infix, get second parameter. */
if (result == LIBAB_SUCCESS && to_call->variant == OPERATOR_INFIX) {
result = _interpreter_run(state, va_arg(args, libab_tree*), &temp,
scope, 0);
@ -717,19 +688,18 @@ libab_result _interpreter_call_operator(struct interpreter_state* state,
}
if(result == LIBAB_SUCCESS) {
result = _interpreter_check_types(&operator_type->children,
&params, &new_types);
libab_ref_free(&function_value);
result = _interpreter_require_value(scope, to_call->function, &function_value);
}
if(result == LIBAB_SUCCESS) {
result = _interpreter_cast_and_perform_operator_call(
state, to_call, &params, &new_types, into);
result = _interpreter_try_call(state, &function_value, &params, into);
}
libab_ref_vec_free(&params);
libab_ref_vec_free(&new_types);
}
va_end(args);
libab_ref_free(&function_value);
return result;
}
@ -810,11 +780,7 @@ libab_result _interpreter_run(struct interpreter_state* state, libab_tree* tree,
} else if (tree->variant == TREE_VOID) {
libab_ref_null(into);
} else if (tree->variant == TREE_ID) {
libab_table_search_value(libab_ref_get(scope), tree->string_value,
into);
if (libab_ref_get(into) == NULL) {
result = LIBAB_UNEXPECTED;
}
result = _interpreter_require_value(scope, tree->string_value, into);
} else if (tree->variant == TREE_CALL) {
result = _interpreter_run_function_node(state, tree, into, scope);
} else if (tree->variant == TREE_OP) {

19
src/libabacus.c
View File

@ -92,7 +92,7 @@ void _initialize_behavior(libab_behavior* behavior, libab_ref* type,
libab_result _register_operator(libab* ab, const char* op,
libab_operator_variant token_type,
int precedence, int associativity,
libab_ref* type, libab_function_ptr func) {
const char* function) {
char op_buffer[8];
libab_result result = LIBAB_SUCCESS;
libab_table_entry* new_entry;
@ -101,7 +101,7 @@ libab_result _register_operator(libab* ab, const char* op,
new_entry->variant = ENTRY_OP;
new_operator = &(new_entry->data_u.op);
libab_operator_init(new_operator, token_type, precedence, associativity,
type, func);
function);
} else {
result = LIBAB_MALLOC;
}
@ -128,22 +128,19 @@ libab_result _register_operator(libab* ab, const char* op,
libab_result libab_register_operator_infix(libab* ab, const char* op,
int precedence, int associativity,
libab_ref* type,
libab_function_ptr func) {
const char* function) {
return _register_operator(ab, op, OPERATOR_INFIX, precedence, associativity,
type, func);
function);
}
libab_result libab_register_operator_prefix(libab* ab, const char* op,
libab_ref* type,
libab_function_ptr func) {
return _register_operator(ab, op, OPERATOR_PREFIX, 0, 0, type, func);
const char* function) {
return _register_operator(ab, op, OPERATOR_PREFIX, 0, 0, function);
}
libab_result libab_register_operator_postfix(libab* ab, const char* op,
libab_ref* type,
libab_function_ptr func) {
return _register_operator(ab, op, OPERATOR_POSTFIX, 0, 0, type, func);
const char* function) {
return _register_operator(ab, op, OPERATOR_POSTFIX, 0, 0, function);
}
libab_result _create_value_function_internal(libab_ref* into, libab_ref* type,