mirror of
https://github.com/mapbox/tippecanoe.git
synced 2025-01-22 04:18:01 +00:00
329 lines
8.0 KiB
C++
329 lines
8.0 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <map>
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#include "mvt.hpp"
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#include "evaluator.hpp"
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int compare(mvt_value one, json_object *two, bool &fail) {
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if (one.type == mvt_string) {
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if (two->type != JSON_STRING) {
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fail = true;
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return false; // string vs non-string
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}
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return strcmp(one.string_value.c_str(), two->string);
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}
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if (one.type == mvt_double || one.type == mvt_float || one.type == mvt_int || one.type == mvt_uint || one.type == mvt_sint) {
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if (two->type != JSON_NUMBER) {
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fail = true;
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return false; // number vs non-number
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}
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double v;
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if (one.type == mvt_double) {
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v = one.numeric_value.double_value;
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} else if (one.type == mvt_float) {
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v = one.numeric_value.float_value;
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} else if (one.type == mvt_int) {
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v = one.numeric_value.int_value;
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} else if (one.type == mvt_uint) {
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v = one.numeric_value.uint_value;
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} else if (one.type == mvt_sint) {
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v = one.numeric_value.sint_value;
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} else {
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fprintf(stderr, "Internal error: bad mvt type %d\n", one.type);
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exit(EXIT_FAILURE);
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}
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if (v < two->number) {
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return -1;
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} else if (v > two->number) {
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return 1;
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} else {
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return 0;
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}
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}
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if (one.type == mvt_bool) {
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if (two->type != JSON_TRUE && two->type != JSON_FALSE) {
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fail = true;
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return false; // bool vs non-bool
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}
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bool b = two->type != JSON_FALSE;
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return one.numeric_value.bool_value > b;
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}
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if (one.type == mvt_null) {
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if (two->type != JSON_NULL) {
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fail = true;
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return false; // null vs non-null
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}
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return 0; // null equals null
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}
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fprintf(stderr, "Internal error: bad mvt type %d\n", one.type);
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exit(EXIT_FAILURE);
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}
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bool eval(std::map<std::string, mvt_value> const &feature, json_object *f) {
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if (f == NULL || f->type != JSON_ARRAY) {
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fprintf(stderr, "Filter is not an array: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (f->length < 1) {
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fprintf(stderr, "Array too small in filter: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (f->array[0]->type != JSON_STRING) {
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fprintf(stderr, "Filter operation is not a string: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (strcmp(f->array[0]->string, "has") == 0 ||
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strcmp(f->array[0]->string, "!has") == 0) {
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if (f->length != 2) {
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fprintf(stderr, "Wrong number of array elements in filter: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (strcmp(f->array[0]->string, "has") == 0) {
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if (f->array[1]->type != JSON_STRING) {
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fprintf(stderr, "\"has\" key is not a string: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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return feature.count(std::string(f->array[1]->string)) != 0;
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}
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if (strcmp(f->array[0]->string, "!has") == 0) {
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if (f->array[1]->type != JSON_STRING) {
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fprintf(stderr, "\"!has\" key is not a string: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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return feature.count(std::string(f->array[1]->string)) == 0;
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}
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}
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if (strcmp(f->array[0]->string, "==") == 0 ||
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strcmp(f->array[0]->string, "!=") == 0 ||
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strcmp(f->array[0]->string, ">") == 0 ||
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strcmp(f->array[0]->string, ">=") == 0 ||
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strcmp(f->array[0]->string, "<") == 0 ||
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strcmp(f->array[0]->string, "<=") == 0) {
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if (f->length != 3) {
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fprintf(stderr, "Wrong number of array elements in filter: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (f->array[1]->type != JSON_STRING) {
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fprintf(stderr, "\"!has\" key is not a string: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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auto ff = feature.find(std::string(f->array[1]->string));
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if (ff == feature.end()) {
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static bool warned = false;
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if (!warned) {
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const char *s = json_stringify(f);
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fprintf(stderr, "Warning: attribute not found for comparison: %s\n", s);
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free((void *) s);
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warned = true;
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}
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if (strcmp(f->array[0]->string, "!=") == 0) {
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return true; // attributes that aren't found are not equal
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}
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return false; // not found: comparison is false
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}
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bool fail = false;
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int cmp = compare(ff->second, f->array[2], fail);
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if (fail) {
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static bool warned = false;
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if (!warned) {
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const char *s = json_stringify(f);
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fprintf(stderr, "Warning: mismatched type in comparison: %s\n", s);
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free((void *) s);
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warned = true;
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}
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if (strcmp(f->array[0]->string, "!=") == 0) {
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return true; // mismatched types are not equal
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}
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return false;
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}
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if (strcmp(f->array[0]->string, "==") == 0) {
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return cmp == 0;
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}
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if (strcmp(f->array[0]->string, "!=") == 0) {
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return cmp != 0;
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}
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if (strcmp(f->array[0]->string, ">") == 0) {
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return cmp > 0;
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}
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if (strcmp(f->array[0]->string, ">=") == 0) {
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return cmp >= 0;
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}
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if (strcmp(f->array[0]->string, "<") == 0) {
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return cmp < 0;
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}
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if (strcmp(f->array[0]->string, "<=") == 0) {
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return cmp <= 0;
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}
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fprintf(stderr, "Internal error: can't happen: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (strcmp(f->array[0]->string, "all") == 0 ||
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strcmp(f->array[0]->string, "any") == 0 ||
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strcmp(f->array[0]->string, "none") == 0) {
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bool v;
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if (strcmp(f->array[0]->string, "all") == 0) {
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v = true;
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} else {
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v = false;
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}
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for (size_t i = 1; i < f->length; i++) {
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bool out = eval(feature, f->array[i]);
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if (strcmp(f->array[0]->string, "all") == 0) {
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v = v && out;
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if (!v) {
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break;
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}
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} else {
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v = v || out;
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if (v) {
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break;
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}
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}
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}
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if (strcmp(f->array[0]->string, "none") == 0) {
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return !v;
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} else {
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return v;
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}
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}
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if (strcmp(f->array[0]->string, "in") == 0 ||
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strcmp(f->array[0]->string, "!in") == 0) {
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if (f->length < 2) {
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fprintf(stderr, "Array too small in filter: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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if (f->array[1]->type != JSON_STRING) {
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fprintf(stderr, "\"!has\" key is not a string: %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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auto ff = feature.find(std::string(f->array[1]->string));
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if (ff == feature.end()) {
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static bool warned = false;
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if (!warned) {
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const char *s = json_stringify(f);
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fprintf(stderr, "Warning: attribute not found for comparison: %s\n", s);
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free((void *) s);
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warned = true;
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}
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if (strcmp(f->array[0]->string, "!in") == 0) {
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return true; // attributes that aren't found are not in
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}
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return false; // not found: comparison is false
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}
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bool found = false;
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for (size_t i = 2; i < f->length; i++) {
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bool fail = false;
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int cmp = compare(ff->second, f->array[i], fail);
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if (fail) {
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static bool warned = false;
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if (!warned) {
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const char *s = json_stringify(f);
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fprintf(stderr, "Warning: mismatched type in comparison: %s\n", s);
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free((void *) s);
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warned = true;
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}
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cmp = 1;
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}
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if (cmp == 0) {
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found = true;
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break;
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}
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}
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if (strcmp(f->array[0]->string, "in") == 0) {
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return found;
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} else {
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return !found;
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}
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}
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fprintf(stderr, "Unknown filter %s\n", json_stringify(f));
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exit(EXIT_FAILURE);
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}
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bool evaluate(std::map<std::string, mvt_value> const &feature, std::string const &layer, json_object *filter) {
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if (filter == NULL || filter->type != JSON_HASH) {
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fprintf(stderr, "Error: filter is not a hash: %s\n", json_stringify(filter));
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exit(EXIT_FAILURE);
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}
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bool ok = true;
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json_object *f;
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f = json_hash_get(filter, layer.c_str());
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if (ok && f != NULL) {
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ok = eval(feature, f);
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}
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f = json_hash_get(filter, "*");
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if (ok && f != NULL) {
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ok = eval(feature, f);
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}
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return ok;
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}
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json_object *read_filter(const char *fname) {
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FILE *fp = fopen(fname, "r");
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if (fp == NULL) {
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perror(fname);
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exit(EXIT_FAILURE);
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}
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json_pull *jp = json_begin_file(fp);
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json_object *filter = json_read_tree(jp);
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if (filter == NULL) {
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fprintf(stderr, "%s: %s\n", fname, jp->error);
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exit(EXIT_FAILURE);
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}
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json_disconnect(filter);
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json_end(jp);
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fclose(fp);
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return filter;
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}
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json_object *parse_filter(const char *s) {
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json_pull *jp = json_begin_string(s);
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json_object *filter = json_read_tree(jp);
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if (filter == NULL) {
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fprintf(stderr, "Could not parse filter %s\n", s);
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fprintf(stderr, "%s\n", jp->error);
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exit(EXIT_FAILURE);
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}
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json_disconnect(filter);
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json_end(jp);
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return filter;
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}
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