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#include <yaml.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <assert.h>
bool get_line(FILE * input, char *line);
char *get_anchor(char sigil, char *line, char *anchor);
char *get_tag(char *line, char *tag);
void get_value(char *line, char *value, int *style);
int main(int argc, char *argv[])
{
FILE *input;
yaml_emitter_t emitter;
yaml_event_t event;
int canonical = 0;
int unicode = 0;
char line[1024];
if (argc == 1)
input = stdin;
else if (argc == 2)
input = fopen(argv[1], "rb");
else {
fprintf(stderr, "Usage: libyaml-emitter [<input-file>]\n");
return 1;
}
assert(input);
if (!yaml_emitter_initialize(&emitter)) {
fprintf(stderr, "Could not initalize the emitter object\n");
return 1;
}
yaml_emitter_set_output_file(&emitter, stdout);
yaml_emitter_set_canonical(&emitter, canonical);
yaml_emitter_set_unicode(&emitter, unicode);
while (get_line(input, line)) {
int ok;
char anchor[256];
char tag[256];
int implicit;
if (strncmp(line, "+STR", 4) == 0) {
ok = yaml_stream_start_event_initialize(&event, YAML_UTF8_ENCODING);
}
else if (strncmp(line, "-STR", 4) == 0) {
ok = yaml_stream_end_event_initialize(&event);
}
else if (strncmp(line, "+DOC", 4) == 0) {
implicit = strncmp(line, "+DOC ---", 8) != 0;
ok = yaml_document_start_event_initialize(&event, NULL, NULL, NULL, implicit);
}
else if (strncmp(line, "-DOC", 4) == 0) {
implicit = strncmp(line, "-DOC ...", 8) != 0;
ok = yaml_document_end_event_initialize(&event, implicit);
}
else if (strncmp(line, "+MAP", 4) == 0) {
ok = yaml_mapping_start_event_initialize(&event, (yaml_char_t *)
get_anchor('&', line, anchor), (yaml_char_t *)
get_tag(line, tag), 0, YAML_BLOCK_MAPPING_STYLE);
}
else if (strncmp(line, "-MAP", 4) == 0) {
ok = yaml_mapping_end_event_initialize(&event);
}
else if (strncmp(line, "+SEQ", 4) == 0) {
ok = yaml_sequence_start_event_initialize(&event, (yaml_char_t *)
get_anchor('&', line, anchor), (yaml_char_t *)
get_tag(line, tag), 0, YAML_BLOCK_SEQUENCE_STYLE);
}
else if (strncmp(line, "-SEQ", 4) == 0) {
ok = yaml_sequence_end_event_initialize(&event);
}
else if (strncmp(line, "=VAL", 4) == 0) {
char value[1024];
int style;
get_value(line, value, &style);
implicit = (get_tag(line, tag) == NULL);
ok = yaml_scalar_event_initialize(&event, (yaml_char_t *)
get_anchor('&', line, anchor), (yaml_char_t *) get_tag(line, tag), (yaml_char_t *) value, -1, implicit, implicit, style);
}
else if (strncmp(line, "=ALI", 4) == 0) {
ok = yaml_alias_event_initialize(&event, (yaml_char_t *)
get_anchor('*', line, anchor)
);
}
else {
fprintf(stderr, "Unknown event: '%s'\n", line);
fflush(stdout);
return 1;
}
if (!ok)
goto event_error;
if (!yaml_emitter_emit(&emitter, &event))
goto emitter_error;
}
assert(!fclose(input));
yaml_emitter_delete(&emitter);
fflush(stdout);
return 0;
emitter_error:
switch (emitter.error) {
case YAML_MEMORY_ERROR:
fprintf(stderr, "Memory error: Not enough memory for emitting\n");
break;
case YAML_WRITER_ERROR:
fprintf(stderr, "Writer error: %s\n", emitter.problem);
break;
case YAML_EMITTER_ERROR:
fprintf(stderr, "Emitter error: %s\n", emitter.problem);
break;
default:
/*
* Couldn't happen.
*/
fprintf(stderr, "Internal error\n");
break;
}
yaml_emitter_delete(&emitter);
return 1;
event_error:
fprintf(stderr, "Memory error: Not enough memory for creating an event\n");
yaml_emitter_delete(&emitter);
return 1;
}
bool get_line(FILE * input, char *line)
{
char *newline;
if (!fgets(line, 1024 - 1, input))
return false;
if ((newline = strchr(line, '\n')) == NULL) {
fprintf(stderr, "Line too long: '%s'", line);
abort();
}
*newline = '\0';
return true;
}
char *get_anchor(char sigil, char *line, char *anchor)
{
char *start;
char *end;
if ((start = strchr(line, sigil)) == NULL)
return NULL;
start++;
if ((end = strchr(start, ' ')) == NULL)
end = line + strlen(line);
memcpy(anchor, start, end - start);
anchor[end - start] = '\0';
return anchor;
}
char *get_tag(char *line, char *tag)
{
char *start;
char *end;
if ((start = strchr(line, '<')) == NULL)
return NULL;
if ((end = strchr(line, '>')) == NULL)
return NULL;
memcpy(tag, start + 1, end - start - 1);
tag[end - start - 1] = '\0';
return tag;
}
void get_value(char *line, char *value, int *style)
{
int i = 0;
char *c;
char *start = NULL;
char *end = line + strlen(line);
for (c = line + 4; c < end; c++) {
if (*c == ' ') {
start = c + 1;
if (*start == ':')
*style = YAML_PLAIN_SCALAR_STYLE;
else if (*start == '\'')
*style = YAML_SINGLE_QUOTED_SCALAR_STYLE;
else if (*start == '"')
*style = YAML_DOUBLE_QUOTED_SCALAR_STYLE;
else if (*start == '|')
*style = YAML_LITERAL_SCALAR_STYLE;
else if (*start == '>')
*style = YAML_FOLDED_SCALAR_STYLE;
else {
start = NULL;
continue;
}
start++;
break;
}
}
if (!start)
abort();
for (c = start; c < end; c++) {
if (*c == '\\') {
if (*++c == '\\')
value[i++] = '\\';
else if (*c == '0')
value[i++] = '\0';
else if (*c == 'b')
value[i++] = '\b';
else if (*c == 'n')
value[i++] = '\n';
else if (*c == 'r')
value[i++] = '\r';
else if (*c == 't')
value[i++] = '\t';
else
abort();
}
else
value[i++] = *c;
}
value[i] = '\0';
}
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