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import * as code from './';
/**
* API for creating external callbacks and intrinsic operations.
*/
export class Creator {
// Callbacks to external C functions
/**
* Create an external callback that **has no** `value` argument.
*
* This callback can be used in all `Invoke` nodes except those that are
* targets of `.select()` method.
*
* C signature of callback must be:
*
* ```c
* int name(llparse_t* state, const char* p, const char* endp)
* ```
*
* Where `llparse_t` is parser state's type name.
*
* @param name External function name.
*/
public match(name: string): code.Match {
return new code.Match(name);
}
/**
* Create an external callback that **has** `value` argument.
*
* This callback can be used only in `Invoke` nodes that are targets of
* `.select()` method.
*
* C signature of callback must be:
*
* ```c
* int name(llparse_t* state, const char* p, const char* endp, int value)
* ```
*
* Where `llparse_t` is parser state's type name.
*
* @param name External function name.
*/
public value(name: string): code.Value {
return new code.Value(name);
}
/**
* Create an external span callback.
*
* This callback can be used only in `Span` constructor.
*
* C signature of callback must be:
*
* ```c
* int name(llparse_t* state, const char* p, const char* endp)
* ```
*
* NOTE: non-zero return value is treated as resumable error.
*
* @param name External function name.
*/
public span(name: string): code.Span {
return new code.Span(name);
}
// Helpers
/**
* Intrinsic operation. Stores `value` from `.select()` node into the state's
* property with the name specified by `field`, returns zero.
*
* state[field] = value;
* return 0;
*
* @param field Property name
*/
public store(field: string): code.Store {
return new code.Store(field);
}
/**
* Intrinsic operation. Loads and returns state's property with the name
* specified by `field`.
*
* The value of the property is either truncated or zero-extended to fit into
* 32-bit unsigned integer.
*
* return state[field];
*
* @param field Property name.
*/
public load(field: string): code.Load {
return new code.Load(field);
}
/**
* Intrinsic operation. Takes `value` from `.select()`, state's property
* with the name `field` and does:
*
* field = state[field];
* field *= options.base;
* field += value;
* state[field] = field;
* return 0; // or 1 on overflow
*
* Return values are:
*
* - 0 - success
* - 1 - overflow
*
* @param field Property name
* @param options See `code.MulAdd` documentation.
*/
public mulAdd(field: string, options: code.IMulAddOptions): code.MulAdd {
return new code.MulAdd(field, options);
}
/**
* Intrinsic operation. Puts `value` integer into the state's property with
* the name specified by `field`.
*
* state[field] = value;
* return 0;
*
* @param field Property name
* @param value Integer value to be stored into the property.
*/
public update(field: string, value: number): code.Update {
return new code.Update(field, value);
}
/**
* Intrinsic operation. Returns 1 if the integer `value` is equal to the
* state's property with the name specified by `field`.
*
* return state[field] === value ? 1 : 0;
*
* @param field Property name
* @param value Integer value to be checked against.
*/
public isEqual(field: string, value: number): code.IsEqual {
return new code.IsEqual(field, value);
}
/**
* Intrinsic operation.
*
* state[field] &= value
* return 0;
*
* @param field Property name
* @param value Integer value
*/
public and(field: string, value: number): code.And {
return new code.And(field, value);
}
/**
* Intrinsic operation.
*
* state[field] |= value
* return 0;
*
* @param field Property name
* @param value Integer value
*/
public or(field: string, value: number): code.Or {
return new code.Or(field, value);
}
/**
* Intrinsic operation.
*
* return (state[field] & value) == value ? 1 : 0;
*
* @param field Property name
* @param value Integer value
*/
public test(field: string, value: number): code.Test {
return new code.Test(field, value);
}
}
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