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Parse nested geometry

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This commit is contained in:
Eric Fischer 2014-09-15 16:32:06 -07:00
parent 3d43c5afbd
commit f54af30a40
1 changed files with 38 additions and 46 deletions
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82
geojson.c
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@ -30,19 +30,42 @@ char *geometry_names[GEOM_TYPES] = {
"MultiPolygon",
};
int geometry_depths[GEOM_TYPES] = {
1,
2,
2,
3,
3,
4,
int geometry_within[GEOM_TYPES] = {
-1, /* point */
GEOM_POINT, /* multipoint */
GEOM_POINT, /* linestring */
GEOM_LINESTRING, /* multilinestring */
GEOM_LINESTRING, /* polygon */
GEOM_POLYGON, /* multipolygon */
};
/* XXX */
#define META_STRING JSON_STRING
#define META_INTEGER JSON_NUMBER
int metabits = 32;
#define META_BOOLEAN JSON_TRUE
void parse_geometry(int t, json_object *j) {
if (j == NULL || j->type != JSON_ARRAY) {
fprintf(stderr, "expected array for type %d\n", t);
return;
}
int within = geometry_within[t];
if (within >= 0) {
printf("[");
int i;
for (i = 0; i < j->length; i++) {
parse_geometry(within, j->array[i]);
}
printf("]");
} else {
if (j->length == 2 && j->array[0]->type == JSON_NUMBER && j->array[1]->type == JSON_NUMBER) {
printf(" %f,%f ", j->array[0]->number, j->array[1]->number);
} else {
fprintf(stderr, "malformed point");
}
}
}
void read_json(FILE *f) {
json_pull *jp = json_begin_file(f);
@ -118,50 +141,19 @@ void read_json(FILE *f) {
metatype[m] = META_INTEGER;
metaval[m] = properties->values[i]->string;
m++;
} else if (properties->values[i] != NULL && (properties->values[i]->type == JSON_TRUE || properties->values[i]->type == JSON_FALSE)) {
metatype[m] = META_BOOLEAN;
metaval[m] = properties->values[i]->string;
m++;
} else {
fprintf(stderr, "%d: Unsupported meta type\n", jp->line);
goto next_feature;
}
}
}
int n;
if (t == GEOM_POINT) {
n = 1;
} else {
n = coordinates->length;
}
double lon[n], lat[n];
int ok = 1;
if (t == GEOM_POINT) {
if (coordinates->length >= 2) {
lon[0] = coordinates->array[0]->number;
lat[0] = coordinates->array[1]->number;
} else {
fprintf(stderr, "%d: not enough coordinates for a point\n", jp->line);
ok = 0;
}
} else {
for (i = 0; i < n; i++) {
if (coordinates->array[i]->type == JSON_ARRAY &&
coordinates->array[i]->length >= 2) {
lon[i] = coordinates->array[i]->array[0]->number;
lat[i] = coordinates->array[i]->array[1]->number;
} else {
fprintf(stderr, "%d: not enough coordinates within the geometry\n", jp->line);
ok = 0;
}
}
}
if (ok) {
for (i = 0; i < n; i++) {
printf("%f,%f ", lat[i], lon[i]);
}
parse_geometry(t, coordinates);
printf("\n");
// XXX encode(destdir, files, maxn, extra, xoff, pool, n, lat, lon, m, metakey, metaval, metatype);
}
}
next_feature: