/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include <stdlib.h>

#include <string.h>

#include "llpkgc.h"

#define CALLBACK_MAYBE(PARSER, NAME)                                           \

  do {                                                                         \

    const llpkgc_settings_t* settings;                                         \

    settings = (const llpkgc_settings_t*) (PARSER)->settings;                  \

    if(settings == NULL || settings->NAME == NULL) {                           \

      err = 0;                                                                 \

      break;                                                                   \

    }                                                                          \

    err = settings->NAME((PARSER));                                            \

  } while(0)

#define SPAN_CALLBACK_MAYBE(PARSER, NAME, START, LEN)                          \

  do {                                                                         \

    const llpkgc_settings_t* settings;                                         \

    settings = (const llpkgc_settings_t*) (PARSER)->settings;                  \

    if(settings == NULL || settings->NAME == NULL) {                           \

      err = 0;                                                                 \

      break;                                                                   \

    }                                                                          \

    err = settings->NAME((PARSER), (START), (LEN));                            \

    if(err == -1) {                                                            \

      err = PCE_USER;                                                          \

      llpkgc_set_error_reason((PARSER), "Span callback error in " #NAME);      \

    }                                                                          \

  } while(0)

void llpkgc_init(llpkgc_t* parser, const llpkgc_settings_t* settings) {

  llpkgc__internal_init(parser);

  parser->settings = (void*) settings;

}

void llpkgc_reset(llpkgc_t* parser) {

  llpkgc_settings_t* settings = parser->settings;

  void* data = parser->data;

  llpkgc__internal_init(parser);

  parser->settings = settings;

  parser->data = data;

}

void llpkgc_settings_init(llpkgc_settings_t* settings) {

  memset(settings, 0, sizeof(*settings));

}

llpkgc_errno_t llpkgc_execute(llpkgc_t* parser, const char* data, size_t len) {

  return llpkgc__internal_execute(parser, data, data + len);

}

llpkgc_errno_t llpkgc_finish(llpkgc_t* parser) {

  if(parser->error != 0)

    return parser->error;

  int err;

  // ToDo: Better handling of user callback errors here

  if(parser->unfinished_ == 1) {

    parser->reason = "Invalid EOF state";

    parser->error = PCE_UNFINISHED;

    return PCE_UNFINISHED;

  } else if(parser->unfinished_ == 2) {

    CALLBACK_MAYBE(parser, on_value_literal_complete);

    if(err != PCE_OK) {

      parser->error = err;

      return err;

    }

    CALLBACK_MAYBE(parser, on_value_complete);

    if(err != PCE_OK) {

      parser->error = err;

      return err;

    }

  } else if(parser->unfinished_ == 3) {

    CALLBACK_MAYBE(parser, on_value_complete);

    if(err != PCE_OK) {

      parser->error = err;

      return err;

    }

  }

  CALLBACK_MAYBE(parser, on_pkgc_complete);

  return err;

}

void llpkgc_pause(llpkgc_t* parser) {

  if(parser->error != PCE_OK) {

    return;

  }

  parser->error = PCE_PAUSED;

  parser->reason = "Paused";

}

void llpkgc_resume(llpkgc_t* parser) {

  if(parser->error != PCE_PAUSED) {

    return;

  }

  parser->error = 0;

}

llpkgc_errno_t llpkgc_get_errno(const llpkgc_t* parser) {

  return parser->error;

}

const char* llpkgc_get_error_reason(const llpkgc_t* parser) {

  return parser->reason;

}

void llpkgc_set_error_reason(llpkgc_t* parser, const char* reason) {

  parser->reason = reason;

}

const char* llpkgc_get_error_pos(const llpkgc_t* parser) {

  return parser->error_pos;

}

const char* llpkgc_errno_name(llpkgc_errno_t err) {

  switch(err) {

    case PCE_OK:

      return "PCE_OK";

    case PCE_INTERNAL:

      return "PCE_INTERNAL";

    case PCE_PAUSED:

      return "PCE_PAUSED";

    case PCE_USER:

      return "PCE_USER";

    case PCE_UNFINISHED:

      return "PCE_UNFINISHED";

  }

  return "INVALID_ERRNO";

}

int llpkgc__line_begin(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 1;

  CALLBACK_MAYBE(s, on_line_begin);

  return err;

}

int llpkgc__key_span(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  SPAN_CALLBACK_MAYBE(s, on_key, p, endp - p);

  return err;

}

int llpkgc__keyword_complete(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 3;

  CALLBACK_MAYBE(s, on_keyword_complete);

  return err;

}

int llpkgc__variable_complete(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 3;

  CALLBACK_MAYBE(s, on_variable_complete);

  return err;

}

int llpkgc__vallit_span(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  if(s->escaped_) {

    --endp;

    s->escaped_ = 0;

  }

  s->unfinished_ = 2;

  SPAN_CALLBACK_MAYBE(s, on_value_literal, p, endp - p);

  return err;

}

int llpkgc__vallit_complete(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 3;

  CALLBACK_MAYBE(s, on_value_literal_complete);

  return err;

}

int llpkgc__valvar_span(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 1;

  SPAN_CALLBACK_MAYBE(s, on_value_variable, p, endp - p);

  return err;

}

int llpkgc__valvar_complete(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 3;

  CALLBACK_MAYBE(s, on_value_variable_complete);

  return err;

}

int llpkgc__value_complete(llpkgc_t* s, const char* p, const char* endp) {

  int err;

  s->unfinished_ = 0;

  CALLBACK_MAYBE(s, on_value_complete);

  return err;

}