xref: /freebsd-10.1-release/contrib/libyaml/src/yaml_private.h

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <yaml.h>

#include <assert.h>
#include <limits.h>

/*
 * Memory management.
 */

YAML_DECLARE(void *)
yaml_malloc(size_t size);

YAML_DECLARE(void *)
yaml_realloc(void *ptr, size_t size);

YAML_DECLARE(void)
yaml_free(void *ptr);

YAML_DECLARE(yaml_char_t *)
yaml_strdup(const yaml_char_t *);

/*
 * Reader: Ensure that the buffer contains at least `length` characters.
 */

YAML_DECLARE(int)
yaml_parser_update_buffer(yaml_parser_t *parser, size_t length);

/*
 * Scanner: Ensure that the token stack contains at least one token ready.
 */

YAML_DECLARE(int)
yaml_parser_fetch_more_tokens(yaml_parser_t *parser);

/*
 * The size of the input raw buffer.
 */

#define INPUT_RAW_BUFFER_SIZE   16384

/*
 * The size of the input buffer.
 *
 * It should be possible to decode the whole raw buffer.
 */

#define INPUT_BUFFER_SIZE       (INPUT_RAW_BUFFER_SIZE*3)

/*
 * The size of the output buffer.
 */

#define OUTPUT_BUFFER_SIZE      16384

/*
 * The size of the output raw buffer.
 *
 * It should be possible to encode the whole output buffer.
 */

#define OUTPUT_RAW_BUFFER_SIZE  (OUTPUT_BUFFER_SIZE*2+2)

/*
 * The size of other stacks and queues.
 */

#define INITIAL_STACK_SIZE  16
#define INITIAL_QUEUE_SIZE  16
#define INITIAL_STRING_SIZE 16

/*
 * Buffer management.
 */

#define BUFFER_INIT(context,buffer,size)                                        \
    (((buffer).start = yaml_malloc(size)) ?                                     \
        ((buffer).last = (buffer).pointer = (buffer).start,                     \
         (buffer).end = (buffer).start+(size),                                  \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define BUFFER_DEL(context,buffer)                                              \
    (yaml_free((buffer).start),                                                 \
     (buffer).start = (buffer).pointer = (buffer).end = 0)

/*
 * String management.
 */

typedef struct {
    yaml_char_t *start;
    yaml_char_t *end;
    yaml_char_t *pointer;
} yaml_string_t;

YAML_DECLARE(int)
yaml_string_extend(yaml_char_t **start,
        yaml_char_t **pointer, yaml_char_t **end);

YAML_DECLARE(int)
yaml_string_join(
        yaml_char_t **a_start, yaml_char_t **a_pointer, yaml_char_t **a_end,
        yaml_char_t **b_start, yaml_char_t **b_pointer, yaml_char_t **b_end);

#define NULL_STRING { NULL, NULL, NULL }

#define STRING(string,length)   { (string), (string)+(length), (string) }

#define STRING_ASSIGN(value,string,length)                                      \
    ((value).start = (string),                                                  \
     (value).end = (string)+(length),                                           \
     (value).pointer = (string))

#define STRING_INIT(context,string,size)                                        \
    (((string).start = yaml_malloc(size)) ?                                     \
        ((string).pointer = (string).start,                                     \
         (string).end = (string).start+(size),                                  \
         memset((string).start, 0, (size)),                                     \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define STRING_DEL(context,string)                                              \
    (yaml_free((string).start),                                                 \
     (string).start = (string).pointer = (string).end = 0)

#define STRING_EXTEND(context,string)                                           \
    (((string).pointer+5 < (string).end)                                        \
        || yaml_string_extend(&(string).start,                                  \
            &(string).pointer, &(string).end))

#define CLEAR(context,string)                                                   \
    ((string).pointer = (string).start,                                         \
     memset((string).start, 0, (string).end-(string).start))

#define JOIN(context,string_a,string_b)                                         \
    ((yaml_string_join(&(string_a).start, &(string_a).pointer,                  \
                       &(string_a).end, &(string_b).start,                      \
                       &(string_b).pointer, &(string_b).end)) ?                 \
        ((string_b).pointer = (string_b).start,                                 \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

/*
 * String check operations.
 */

/*
 * Check the octet at the specified position.
 */

#define CHECK_AT(string,octet,offset)                                           \
    ((string).pointer[offset] == (yaml_char_t)(octet))

/*
 * Check the current octet in the buffer.
 */

#define CHECK(string,octet) CHECK_AT((string),(octet),0)

/*
 * Check if the character at the specified position is an alphabetical
 * character, a digit, '_', or '-'.
 */

#define IS_ALPHA_AT(string,offset)                                              \
     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
       (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
      ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
       (string).pointer[offset] <= (yaml_char_t) 'Z') ||                        \
      ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
       (string).pointer[offset] <= (yaml_char_t) 'z') ||                        \
      (string).pointer[offset] == '_' ||                                        \
      (string).pointer[offset] == '-')

#define IS_ALPHA(string)    IS_ALPHA_AT((string),0)

/*
 * Check if the character at the specified position is a digit.
 */

#define IS_DIGIT_AT(string,offset)                                              \
     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
       (string).pointer[offset] <= (yaml_char_t) '9'))

#define IS_DIGIT(string)    IS_DIGIT_AT((string),0)

/*
 * Get the value of a digit.
 */

#define AS_DIGIT_AT(string,offset)                                              \
     ((string).pointer[offset] - (yaml_char_t) '0')

#define AS_DIGIT(string)    AS_DIGIT_AT((string),0)

/*
 * Check if the character at the specified position is a hex-digit.
 */

#define IS_HEX_AT(string,offset)                                                \
     (((string).pointer[offset] >= (yaml_char_t) '0' &&                         \
       (string).pointer[offset] <= (yaml_char_t) '9') ||                        \
      ((string).pointer[offset] >= (yaml_char_t) 'A' &&                         \
       (string).pointer[offset] <= (yaml_char_t) 'F') ||                        \
      ((string).pointer[offset] >= (yaml_char_t) 'a' &&                         \
       (string).pointer[offset] <= (yaml_char_t) 'f'))

#define IS_HEX(string)    IS_HEX_AT((string),0)

/*
 * Get the value of a hex-digit.
 */

#define AS_HEX_AT(string,offset)                                                \
      (((string).pointer[offset] >= (yaml_char_t) 'A' &&                        \
        (string).pointer[offset] <= (yaml_char_t) 'F') ?                        \
       ((string).pointer[offset] - (yaml_char_t) 'A' + 10) :                    \
       ((string).pointer[offset] >= (yaml_char_t) 'a' &&                        \
        (string).pointer[offset] <= (yaml_char_t) 'f') ?                        \
       ((string).pointer[offset] - (yaml_char_t) 'a' + 10) :                    \
       ((string).pointer[offset] - (yaml_char_t) '0'))

#define AS_HEX(string)  AS_HEX_AT((string),0)

/*
 * Check if the character is ASCII.
 */

#define IS_ASCII_AT(string,offset)                                              \
    ((string).pointer[offset] <= (yaml_char_t) '\x7F')

#define IS_ASCII(string)    IS_ASCII_AT((string),0)

/*
 * Check if the character can be printed unescaped.
 */

#define IS_PRINTABLE_AT(string,offset)                                          \
    (((string).pointer[offset] == 0x0A)         /* . == #x0A */                 \
     || ((string).pointer[offset] >= 0x20       /* #x20 <= . <= #x7E */         \
         && (string).pointer[offset] <= 0x7E)                                   \
     || ((string).pointer[offset] == 0xC2       /* #0xA0 <= . <= #xD7FF */      \
         && (string).pointer[offset+1] >= 0xA0)                                 \
     || ((string).pointer[offset] > 0xC2                                        \
         && (string).pointer[offset] < 0xED)                                    \
     || ((string).pointer[offset] == 0xED                                       \
         && (string).pointer[offset+1] < 0xA0)                                  \
     || ((string).pointer[offset] == 0xEE)                                      \
     || ((string).pointer[offset] == 0xEF      /* #xE000 <= . <= #xFFFD */      \
         && !((string).pointer[offset+1] == 0xBB        /* && . != #xFEFF */    \
             && (string).pointer[offset+2] == 0xBF)                             \
         && !((string).pointer[offset+1] == 0xBF                                \
             && ((string).pointer[offset+2] == 0xBE                             \
                 || (string).pointer[offset+2] == 0xBF))))

#define IS_PRINTABLE(string)    IS_PRINTABLE_AT((string),0)

/*
 * Check if the character at the specified position is NUL.
 */

#define IS_Z_AT(string,offset)    CHECK_AT((string),'\0',(offset))

#define IS_Z(string)    IS_Z_AT((string),0)

/*
 * Check if the character at the specified position is BOM.
 */

#define IS_BOM_AT(string,offset)                                                \
     (CHECK_AT((string),'\xEF',(offset))                                        \
      && CHECK_AT((string),'\xBB',(offset)+1)                                   \
      && CHECK_AT((string),'\xBF',(offset)+2))  /* BOM (#xFEFF) */

#define IS_BOM(string)  IS_BOM_AT(string,0)

/*
 * Check if the character at the specified position is space.
 */

#define IS_SPACE_AT(string,offset)  CHECK_AT((string),' ',(offset))

#define IS_SPACE(string)    IS_SPACE_AT((string),0)

/*
 * Check if the character at the specified position is tab.
 */

#define IS_TAB_AT(string,offset)    CHECK_AT((string),'\t',(offset))

#define IS_TAB(string)  IS_TAB_AT((string),0)

/*
 * Check if the character at the specified position is blank (space or tab).
 */

#define IS_BLANK_AT(string,offset)                                              \
    (IS_SPACE_AT((string),(offset)) || IS_TAB_AT((string),(offset)))

#define IS_BLANK(string)    IS_BLANK_AT((string),0)

/*
 * Check if the character at the specified position is a line break.
 */

#define IS_BREAK_AT(string,offset)                                              \
    (CHECK_AT((string),'\r',(offset))               /* CR (#xD)*/               \
     || CHECK_AT((string),'\n',(offset))            /* LF (#xA) */              \
     || (CHECK_AT((string),'\xC2',(offset))                                     \
         && CHECK_AT((string),'\x85',(offset)+1))   /* NEL (#x85) */            \
     || (CHECK_AT((string),'\xE2',(offset))                                     \
         && CHECK_AT((string),'\x80',(offset)+1)                                \
         && CHECK_AT((string),'\xA8',(offset)+2))   /* LS (#x2028) */           \
     || (CHECK_AT((string),'\xE2',(offset))                                     \
         && CHECK_AT((string),'\x80',(offset)+1)                                \
         && CHECK_AT((string),'\xA9',(offset)+2)))  /* PS (#x2029) */

#define IS_BREAK(string)    IS_BREAK_AT((string),0)

#define IS_CRLF_AT(string,offset)                                               \
     (CHECK_AT((string),'\r',(offset)) && CHECK_AT((string),'\n',(offset)+1))

#define IS_CRLF(string) IS_CRLF_AT((string),0)

/*
 * Check if the character is a line break or NUL.
 */

#define IS_BREAKZ_AT(string,offset)                                             \
    (IS_BREAK_AT((string),(offset)) || IS_Z_AT((string),(offset)))

#define IS_BREAKZ(string)   IS_BREAKZ_AT((string),0)

/*
 * Check if the character is a line break, space, or NUL.
 */

#define IS_SPACEZ_AT(string,offset)                                             \
    (IS_SPACE_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))

#define IS_SPACEZ(string)   IS_SPACEZ_AT((string),0)

/*
 * Check if the character is a line break, space, tab, or NUL.
 */

#define IS_BLANKZ_AT(string,offset)                                             \
    (IS_BLANK_AT((string),(offset)) || IS_BREAKZ_AT((string),(offset)))

#define IS_BLANKZ(string)   IS_BLANKZ_AT((string),0)

/*
 * Determine the width of the character.
 */

#define WIDTH_AT(string,offset)                                                 \
     (((string).pointer[offset] & 0x80) == 0x00 ? 1 :                           \
      ((string).pointer[offset] & 0xE0) == 0xC0 ? 2 :                           \
      ((string).pointer[offset] & 0xF0) == 0xE0 ? 3 :                           \
      ((string).pointer[offset] & 0xF8) == 0xF0 ? 4 : 0)

#define WIDTH(string)   WIDTH_AT((string),0)

/*
 * Move the string pointer to the next character.
 */

#define MOVE(string)    ((string).pointer += WIDTH((string)))

/*
 * Copy a character and move the pointers of both strings.
 */

#define COPY(string_a,string_b)                                                 \
    ((*(string_b).pointer & 0x80) == 0x00 ?                                     \
     (*((string_a).pointer++) = *((string_b).pointer++)) :                      \
     (*(string_b).pointer & 0xE0) == 0xC0 ?                                     \
     (*((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++)) :                      \
     (*(string_b).pointer & 0xF0) == 0xE0 ?                                     \
     (*((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++)) :                      \
     (*(string_b).pointer & 0xF8) == 0xF0 ?                                     \
     (*((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++),                        \
      *((string_a).pointer++) = *((string_b).pointer++)) : 0)

/*
 * Stack and queue management.
 */

YAML_DECLARE(int)
yaml_stack_extend(void **start, void **top, void **end);

YAML_DECLARE(int)
yaml_queue_extend(void **start, void **head, void **tail, void **end);

#define STACK_INIT(context,stack,size)                                          \
    (((stack).start = yaml_malloc((size)*sizeof(*(stack).start))) ?             \
        ((stack).top = (stack).start,                                           \
         (stack).end = (stack).start+(size),                                    \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define STACK_DEL(context,stack)                                                \
    (yaml_free((stack).start),                                                  \
     (stack).start = (stack).top = (stack).end = 0)

#define STACK_EMPTY(context,stack)                                              \
    ((stack).start == (stack).top)

#define PUSH(context,stack,value)                                               \
    (((stack).top != (stack).end                                                \
      || yaml_stack_extend((void **)&(stack).start,                             \
              (void **)&(stack).top, (void **)&(stack).end)) ?                  \
        (*((stack).top++) = value,                                              \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define POP(context,stack)                                                      \
    (*(--(stack).top))

#define QUEUE_INIT(context,queue,size)                                          \
    (((queue).start = yaml_malloc((size)*sizeof(*(queue).start))) ?             \
        ((queue).head = (queue).tail = (queue).start,                           \
         (queue).end = (queue).start+(size),                                    \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define QUEUE_DEL(context,queue)                                                \
    (yaml_free((queue).start),                                                  \
     (queue).start = (queue).head = (queue).tail = (queue).end = 0)

#define QUEUE_EMPTY(context,queue)                                              \
    ((queue).head == (queue).tail)

#define ENQUEUE(context,queue,value)                                            \
    (((queue).tail != (queue).end                                               \
      || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
            (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
        (*((queue).tail++) = value,                                             \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

#define DEQUEUE(context,queue)                                                  \
    (*((queue).head++))

#define QUEUE_INSERT(context,queue,index,value)                                 \
    (((queue).tail != (queue).end                                               \
      || yaml_queue_extend((void **)&(queue).start, (void **)&(queue).head,     \
            (void **)&(queue).tail, (void **)&(queue).end)) ?                   \
        (memmove((queue).head+(index)+1,(queue).head+(index),                   \
            ((queue).tail-(queue).head-(index))*sizeof(*(queue).start)),        \
         *((queue).head+(index)) = value,                                       \
         (queue).tail++,                                                        \
         1) :                                                                   \
        ((context)->error = YAML_MEMORY_ERROR,                                  \
         0))

/*
 * Token initializers.
 */

#define TOKEN_INIT(token,token_type,token_start_mark,token_end_mark)            \
    (memset(&(token), 0, sizeof(yaml_token_t)),                                 \
     (token).type = (token_type),                                               \
     (token).start_mark = (token_start_mark),                                   \
     (token).end_mark = (token_end_mark))

#define STREAM_START_TOKEN_INIT(token,token_encoding,start_mark,end_mark)       \
    (TOKEN_INIT((token),YAML_STREAM_START_TOKEN,(start_mark),(end_mark)),       \
     (token).data.stream_start.encoding = (token_encoding))

#define STREAM_END_TOKEN_INIT(token,start_mark,end_mark)                        \
    (TOKEN_INIT((token),YAML_STREAM_END_TOKEN,(start_mark),(end_mark)))

#define ALIAS_TOKEN_INIT(token,token_value,start_mark,end_mark)                 \
    (TOKEN_INIT((token),YAML_ALIAS_TOKEN,(start_mark),(end_mark)),              \
     (token).data.alias.value = (token_value))

#define ANCHOR_TOKEN_INIT(token,token_value,start_mark,end_mark)                \
    (TOKEN_INIT((token),YAML_ANCHOR_TOKEN,(start_mark),(end_mark)),             \
     (token).data.anchor.value = (token_value))

#define TAG_TOKEN_INIT(token,token_handle,token_suffix,start_mark,end_mark)     \
    (TOKEN_INIT((token),YAML_TAG_TOKEN,(start_mark),(end_mark)),                \
     (token).data.tag.handle = (token_handle),                                  \
     (token).data.tag.suffix = (token_suffix))

#define SCALAR_TOKEN_INIT(token,token_value,token_length,token_style,start_mark,end_mark)   \
    (TOKEN_INIT((token),YAML_SCALAR_TOKEN,(start_mark),(end_mark)),             \
     (token).data.scalar.value = (token_value),                                 \
     (token).data.scalar.length = (token_length),                               \
     (token).data.scalar.style = (token_style))

#define VERSION_DIRECTIVE_TOKEN_INIT(token,token_major,token_minor,start_mark,end_mark)     \
    (TOKEN_INIT((token),YAML_VERSION_DIRECTIVE_TOKEN,(start_mark),(end_mark)),  \
     (token).data.version_directive.major = (token_major),                      \
     (token).data.version_directive.minor = (token_minor))

#define TAG_DIRECTIVE_TOKEN_INIT(token,token_handle,token_prefix,start_mark,end_mark)       \
    (TOKEN_INIT((token),YAML_TAG_DIRECTIVE_TOKEN,(start_mark),(end_mark)),      \
     (token).data.tag_directive.handle = (token_handle),                        \
     (token).data.tag_directive.prefix = (token_prefix))

/*
 * Event initializers.
 */

#define EVENT_INIT(event,event_type,event_start_mark,event_end_mark)            \
    (memset(&(event), 0, sizeof(yaml_event_t)),                                 \
     (event).type = (event_type),                                               \
     (event).start_mark = (event_start_mark),                                   \
     (event).end_mark = (event_end_mark))

#define STREAM_START_EVENT_INIT(event,event_encoding,start_mark,end_mark)       \
    (EVENT_INIT((event),YAML_STREAM_START_EVENT,(start_mark),(end_mark)),       \
     (event).data.stream_start.encoding = (event_encoding))

#define STREAM_END_EVENT_INIT(event,start_mark,end_mark)                        \
    (EVENT_INIT((event),YAML_STREAM_END_EVENT,(start_mark),(end_mark)))

#define DOCUMENT_START_EVENT_INIT(event,event_version_directive,                \
        event_tag_directives_start,event_tag_directives_end,event_implicit,start_mark,end_mark) \
    (EVENT_INIT((event),YAML_DOCUMENT_START_EVENT,(start_mark),(end_mark)),     \
     (event).data.document_start.version_directive = (event_version_directive), \
     (event).data.document_start.tag_directives.start = (event_tag_directives_start),   \
     (event).data.document_start.tag_directives.end = (event_tag_directives_end),   \
     (event).data.document_start.implicit = (event_implicit))

#define DOCUMENT_END_EVENT_INIT(event,event_implicit,start_mark,end_mark)       \
    (EVENT_INIT((event),YAML_DOCUMENT_END_EVENT,(start_mark),(end_mark)),       \
     (event).data.document_end.implicit = (event_implicit))

#define ALIAS_EVENT_INIT(event,event_anchor,start_mark,end_mark)                \
    (EVENT_INIT((event),YAML_ALIAS_EVENT,(start_mark),(end_mark)),              \
     (event).data.alias.anchor = (event_anchor))

#define SCALAR_EVENT_INIT(event,event_anchor,event_tag,event_value,event_length,    \
        event_plain_implicit, event_quoted_implicit,event_style,start_mark,end_mark)    \
    (EVENT_INIT((event),YAML_SCALAR_EVENT,(start_mark),(end_mark)),             \
     (event).data.scalar.anchor = (event_anchor),                               \
     (event).data.scalar.tag = (event_tag),                                     \
     (event).data.scalar.value = (event_value),                                 \
     (event).data.scalar.length = (event_length),                               \
     (event).data.scalar.plain_implicit = (event_plain_implicit),               \
     (event).data.scalar.quoted_implicit = (event_quoted_implicit),             \
     (event).data.scalar.style = (event_style))

#define SEQUENCE_START_EVENT_INIT(event,event_anchor,event_tag,                 \
        event_implicit,event_style,start_mark,end_mark)                         \
    (EVENT_INIT((event),YAML_SEQUENCE_START_EVENT,(start_mark),(end_mark)),     \
     (event).data.sequence_start.anchor = (event_anchor),                       \
     (event).data.sequence_start.tag = (event_tag),                             \
     (event).data.sequence_start.implicit = (event_implicit),                   \
     (event).data.sequence_start.style = (event_style))

#define SEQUENCE_END_EVENT_INIT(event,start_mark,end_mark)                      \
    (EVENT_INIT((event),YAML_SEQUENCE_END_EVENT,(start_mark),(end_mark)))

#define MAPPING_START_EVENT_INIT(event,event_anchor,event_tag,                  \
        event_implicit,event_style,start_mark,end_mark)                         \
    (EVENT_INIT((event),YAML_MAPPING_START_EVENT,(start_mark),(end_mark)),      \
     (event).data.mapping_start.anchor = (event_anchor),                        \
     (event).data.mapping_start.tag = (event_tag),                              \
     (event).data.mapping_start.implicit = (event_implicit),                    \
     (event).data.mapping_start.style = (event_style))

#define MAPPING_END_EVENT_INIT(event,start_mark,end_mark)                       \
    (EVENT_INIT((event),YAML_MAPPING_END_EVENT,(start_mark),(end_mark)))

/*
 * Document initializer.
 */

#define DOCUMENT_INIT(document,document_nodes_start,document_nodes_end,         \
        document_version_directive,document_tag_directives_start,               \
        document_tag_directives_end,document_start_implicit,                    \
        document_end_implicit,document_start_mark,document_end_mark)            \
    (memset(&(document), 0, sizeof(yaml_document_t)),                           \
     (document).nodes.start = (document_nodes_start),                           \
     (document).nodes.end = (document_nodes_end),                               \
     (document).nodes.top = (document_nodes_start),                             \
     (document).version_directive = (document_version_directive),               \
     (document).tag_directives.start = (document_tag_directives_start),         \
     (document).tag_directives.end = (document_tag_directives_end),             \
     (document).start_implicit = (document_start_implicit),                     \
     (document).end_implicit = (document_end_implicit),                         \
     (document).start_mark = (document_start_mark),                             \
     (document).end_mark = (document_end_mark))

/*
 * Node initializers.
 */

#define NODE_INIT(node,node_type,node_tag,node_start_mark,node_end_mark)        \
    (memset(&(node), 0, sizeof(yaml_node_t)),                                   \
     (node).type = (node_type),                                                 \
     (node).tag = (node_tag),                                                   \
     (node).start_mark = (node_start_mark),                                     \
     (node).end_mark = (node_end_mark))

#define SCALAR_NODE_INIT(node,node_tag,node_value,node_length,                  \
        node_style,start_mark,end_mark)                                         \
    (NODE_INIT((node),YAML_SCALAR_NODE,(node_tag),(start_mark),(end_mark)),     \
     (node).data.scalar.value = (node_value),                                   \
     (node).data.scalar.length = (node_length),                                 \
     (node).data.scalar.style = (node_style))

#define SEQUENCE_NODE_INIT(node,node_tag,node_items_start,node_items_end,       \
        node_style,start_mark,end_mark)                                         \
    (NODE_INIT((node),YAML_SEQUENCE_NODE,(node_tag),(start_mark),(end_mark)),   \
     (node).data.sequence.items.start = (node_items_start),                     \
     (node).data.sequence.items.end = (node_items_end),                         \
     (node).data.sequence.items.top = (node_items_start),                       \
     (node).data.sequence.style = (node_style))

#define MAPPING_NODE_INIT(node,node_tag,node_pairs_start,node_pairs_end,        \
        node_style,start_mark,end_mark)                                         \
    (NODE_INIT((node),YAML_MAPPING_NODE,(node_tag),(start_mark),(end_mark)),    \
     (node).data.mapping.pairs.start = (node_pairs_start),                      \
     (node).data.mapping.pairs.end = (node_pairs_end),                          \
     (node).data.mapping.pairs.top = (node_pairs_start),                        \
     (node).data.mapping.style = (node_style))