jsonpath *parse(parser_context *context)
{
PRECOND_NONNULL_ELSE_NULL(context);
PRECOND_NONNULL_ELSE_NULL(context->path);
PRECOND_NONNULL_ELSE_NULL(context->input);
PRECOND_ELSE_NULL(0 != context->length);
debug_string("parsing expression: '%s'", context->input, context->length);
if(parse_expression(context))
{
parser_debug("done. found %zd steps.", context->path->length);
return context->path;
}
else
{
context->result.actual_char = context->input[context->cursor];
#ifdef USE_LOGGING
char *message = parser_status_message(context);
parser_error("aborted. unable to create jsonpath model. status: %d (%s)", context->result.code, message);
free(message);
#endif
path_free(context->path);
context->path = NULL;
return NULL;
}
}
step *path_get(const jsonpath *path, size_t index)
{
PRECOND_NONNULL_ELSE_NULL(path);
PRECOND_NONNULL_ELSE_NULL(path->steps);
PRECOND_ELSE_NULL(0 != path->length, index < path->length);
return path->steps[index];
}
char *loader_status_message(const struct loader_context *context)
{
PRECOND_NONNULL_ELSE_NULL(context);
char *message = NULL;
int result = 0;
switch (context->code)
{
case ERR_READER_FAILED:
result = asprintf(&message, MESSAGES[context->code], context->parser.problem, context->parser.problem_offset);
break;
case ERR_PARSER_FAILED:
case ERR_SCANNER_FAILED:
result = asprintf(&message, MESSAGES[context->code], context->parser.problem, context->parser.problem_mark.line+1, context->parser.problem_mark.column+1);
break;
case ERR_ALIAS_LOOP:
case ERR_NO_ANCHOR_FOR_ALIAS:
case ERR_NON_SCALAR_KEY:
case ERR_DUPLICATE_KEY:
result = asprintf(&message, MESSAGES[context->code], context->parser.mark.line);
break;
default:
message = strdup(MESSAGES[context->code]);
break;
}
if(-1 == result)
{
message = NULL;
}
return message;
}
node *document_root(const node *document)
{
PRECOND_NONNULL_ELSE_NULL(document);
PRECOND_ELSE_NULL(DOCUMENT == node_kind(document));
return document->content.target;
}
node *model_document(const document_model *model, size_t index)
{
PRECOND_NONNULL_ELSE_NULL(model);
PRECOND_ELSE_NULL(index < model_document_count(model));
return vector_get(model->documents, index);
}
node *alias_target(const node *alias)
{
PRECOND_NONNULL_ELSE_NULL(alias);
PRECOND_ELSE_NULL(ALIAS == node_kind(alias));
return alias->content.target;
}
uint8_t *scalar_value(const node *scalar)
{
PRECOND_NONNULL_ELSE_NULL(scalar);
PRECOND_ELSE_NULL(SCALAR == node_kind(scalar));
return scalar->content.scalar.value;
}
node *sequence_get(const node *sequence, size_t index)
{
PRECOND_NONNULL_ELSE_NULL(sequence);
PRECOND_ELSE_NULL(SEQUENCE == node_kind(sequence));
PRECOND_ELSE_NULL(index < node_size(sequence));
return vector_get(sequence->content.sequence, index);
}
bool sequence_iterate(const node *sequence, sequence_iterator iterator, void *context)
{
PRECOND_NONNULL_ELSE_FALSE(sequence, iterator);
PRECOND_ELSE_FALSE(SEQUENCE == node_kind(sequence));
context_adapter adapter = {.iterator.sequence=iterator, .context=context };
return vector_iterate(sequence->content.sequence, sequence_iterator_adpater, &adapter);
}
node *mapping_get(const node *mapping, uint8_t *scalar, size_t length)
{
PRECOND_NONNULL_ELSE_NULL(mapping, scalar);
PRECOND_ELSE_NULL(MAPPING == node_kind(mapping));
PRECOND_ELSE_NULL(0 < length);
node *key = make_scalar_node(scalar, length, SCALAR_STRING);
node *result = hashtable_get(mapping->content.mapping, key);
node_free(key);
return result;
}
predicate *step_predicate(const step *value)
{
PRECOND_NONNULL_ELSE_NULL(value);
PRECOND_NONNULL_ELSE_NULL(value->predicate);
return value->predicate;
}
uint8_t *name_test_step_name(const step *value)
{
PRECOND_NONNULL_ELSE_NULL(value);
PRECOND_ELSE_NULL(NAME_TEST == value->test.kind);
return value->test.name.value;
}
uint8_t *path_expression(const jsonpath *path)
{
PRECOND_NONNULL_ELSE_NULL(path);
return path->expression;
}
node *node_parent(const node *value)
{
PRECOND_NONNULL_ELSE_NULL(value);
return value->parent;
}
uint8_t *node_name(const node *value)
{
PRECOND_NONNULL_ELSE_NULL(value);
return value->tag.name;
}