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#ifndef PRISM_INTERNAL_SOURCE_H
#define PRISM_INTERNAL_SOURCE_H
#include "prism/source.h"
#include "prism/buffer.h"
#include <stdbool.h>
/*
* The type of source, which determines cleanup behavior.
*/
typedef enum {
/* Wraps existing constant memory, no cleanup. */
PM_SOURCE_CONSTANT,
/* Wraps existing shared memory (non-owning slice), no cleanup. */
PM_SOURCE_SHARED,
/* Owns a heap-allocated buffer, freed on cleanup. */
PM_SOURCE_OWNED,
/* Memory-mapped file, unmapped on cleanup. */
PM_SOURCE_MAPPED,
/* Stream source backed by a pm_buffer_t. */
PM_SOURCE_STREAM
} pm_source_type_t;
/*
* The internal representation of a source.
*/
struct pm_source_t {
/* A pointer to the start of the source data. */
const uint8_t *source;
/* The length of the source data in bytes. */
size_t length;
/* The type of the source. */
pm_source_type_t type;
/* Stream-specific data, only used for PM_SOURCE_STREAM sources. */
struct {
/* The buffer that holds the accumulated stream data. */
pm_buffer_t *buffer;
/* The stream object to read from. */
void *stream;
/* The function to use to read from the stream. */
pm_source_stream_fgets_t *fgets;
/* The function to use to check if the stream is at EOF. */
pm_source_stream_feof_t *feof;
/* Whether the stream has reached EOF. */
bool eof;
} stream;
};
/*
* Read from a stream into the source's internal buffer. This is used by
* pm_parse_stream to incrementally read the source.
*/
bool pm_source_stream_read(pm_source_t *source);
/*
* Returns whether the stream source has reached EOF.
*/
bool pm_source_stream_eof(const pm_source_t *source);
#endif
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