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#include <yaml.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
void print_escaped(yaml_char_t * str, size_t length);
int usage(int ret);
int main(int argc, char *argv[])
{
FILE *input;
yaml_parser_t parser;
yaml_event_t event;
int flow = -1; /** default no flow style collections */
int i = 0;
int foundfile = 0;
for (i = 1; i < argc; i++) {
if (strncmp(argv[i], "--flow", 6) == 0) {
if (i+1 == argc)
return usage(1);
i++;
if (strncmp(argv[i], "keep", 4) == 0)
flow = 0;
else if (strncmp(argv[i], "on", 2) == 0)
flow = 1;
else if (strncmp(argv[i], "off", 3) == 0)
flow = -1;
else
return usage(1);
}
else if (strncmp(argv[i], "--help", 6) == 0)
return usage(0);
else if (strncmp(argv[i], "-h", 2) == 0)
return usage(0);
else if (!foundfile) {
input = fopen(argv[i], "rb");
foundfile = 1;
}
else
return usage(1);
}
if (!foundfile) {
input = stdin;
}
assert(input);
if (!yaml_parser_initialize(&parser)) {
fprintf(stderr, "Could not initialize the parser object\n");
return 1;
}
yaml_parser_set_input_file(&parser, input);
while (1) {
yaml_event_type_t type;
if (!yaml_parser_parse(&parser, &event)) {
if ( parser.problem_mark.line || parser.problem_mark.column ) {
fprintf(stderr, "Parse error: %s\nLine: %lu Column: %lu\n",
parser.problem,
(unsigned long)parser.problem_mark.line + 1,
(unsigned long)parser.problem_mark.column + 1);
}
else {
fprintf(stderr, "Parse error: %s\n", parser.problem);
}
return 1;
}
type = event.type;
if (type == YAML_NO_EVENT)
printf("???\n");
else if (type == YAML_STREAM_START_EVENT)
printf("+STR\n");
else if (type == YAML_STREAM_END_EVENT)
printf("-STR\n");
else if (type == YAML_DOCUMENT_START_EVENT) {
printf("+DOC");
if (!event.data.document_start.implicit)
printf(" ---");
printf("\n");
}
else if (type == YAML_DOCUMENT_END_EVENT) {
printf("-DOC");
if (!event.data.document_end.implicit)
printf(" ...");
printf("\n");
}
else if (type == YAML_MAPPING_START_EVENT) {
printf("+MAP");
if (flow == 0 && event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE)
printf(" {}");
else if (flow == 1)
printf(" {}");
if (event.data.mapping_start.anchor)
printf(" &%s", event.data.mapping_start.anchor);
if (event.data.mapping_start.tag)
printf(" <%s>", event.data.mapping_start.tag);
printf("\n");
}
else if (type == YAML_MAPPING_END_EVENT)
printf("-MAP\n");
else if (type == YAML_SEQUENCE_START_EVENT) {
printf("+SEQ");
if (flow == 0 && event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE)
printf(" []");
else if (flow == 1)
printf(" []");
if (event.data.sequence_start.anchor)
printf(" &%s", event.data.sequence_start.anchor);
if (event.data.sequence_start.tag)
printf(" <%s>", event.data.sequence_start.tag);
printf("\n");
}
else if (type == YAML_SEQUENCE_END_EVENT)
printf("-SEQ\n");
else if (type == YAML_SCALAR_EVENT) {
printf("=VAL");
if (event.data.scalar.anchor)
printf(" &%s", event.data.scalar.anchor);
if (event.data.scalar.tag)
printf(" <%s>", event.data.scalar.tag);
switch (event.data.scalar.style) {
case YAML_PLAIN_SCALAR_STYLE:
printf(" :");
break;
case YAML_SINGLE_QUOTED_SCALAR_STYLE:
printf(" '");
break;
case YAML_DOUBLE_QUOTED_SCALAR_STYLE:
printf(" \"");
break;
case YAML_LITERAL_SCALAR_STYLE:
printf(" |");
break;
case YAML_FOLDED_SCALAR_STYLE:
printf(" >");
break;
case YAML_ANY_SCALAR_STYLE:
abort();
}
print_escaped(event.data.scalar.value, event.data.scalar.length);
printf("\n");
}
else if (type == YAML_ALIAS_EVENT)
printf("=ALI *%s\n", event.data.alias.anchor);
else
abort();
yaml_event_delete(&event);
if (type == YAML_STREAM_END_EVENT)
break;
}
assert(!fclose(input));
yaml_parser_delete(&parser);
fflush(stdout);
return 0;
}
void print_escaped(yaml_char_t * str, size_t length)
{
int i;
char c;
for (i = 0; i < length; i++) {
c = *(str + i);
if (c == '\\')
printf("\\\\");
else if (c == '\0')
printf("\\0");
else if (c == '\b')
printf("\\b");
else if (c == '\n')
printf("\\n");
else if (c == '\r')
printf("\\r");
else if (c == '\t')
printf("\\t");
else
printf("%c", c);
}
}
int usage(int ret) {
fprintf(stderr, "Usage: libyaml-parser [--flow (on|off|keep)] [<input-file>]\n");
return ret;
}
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