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JSON can be written to either a FILE or a string

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This commit is contained in:
Eric Fischer
2018-03-16 14:20:52 -07:00
parent 1c4aa57ffd
commit 08fc2f281e
2 changed files with 72 additions and 31 deletions
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write_json.cpp
+61 -30
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@@ -13,38 +13,38 @@ void json_writer::json_adjust() {
if (state.size() == 0) {
state.push_back(JSON_WRITE_TOP);
} else if (state[state.size() - 1] == JSON_WRITE_TOP) {
fprintf(f, "\n");
addc('\n');
state[state.size() - 1] = JSON_WRITE_TOP;
} else if (state[state.size() - 1] == JSON_WRITE_HASH) {
if (!nospace) {
fprintf(f, " ");
addc(' ');
}
nospace = false;
state[state.size() - 1] = JSON_WRITE_HASH_KEY;
} else if (state[state.size() - 1] == JSON_WRITE_HASH_KEY) {
fprintf(f, ": ");
adds(": ");
state[state.size() - 1] = JSON_WRITE_HASH_VALUE;
} else if (state[state.size() - 1] == JSON_WRITE_HASH_VALUE) {
if (wantnl) {
fprintf(f, ",\n");
adds(",\n");
nospace = false;
} else {
fprintf(f, ", ");
adds(", ");
}
wantnl = false;
state[state.size() - 1] = JSON_WRITE_HASH_KEY;
} else if (state[state.size() - 1] == JSON_WRITE_ARRAY) {
if (!nospace) {
fprintf(f, " ");
addc(' ');
}
nospace = false;
state[state.size() - 1] = JSON_WRITE_ARRAY_ELEMENT;
} else if (state[state.size() - 1] == JSON_WRITE_ARRAY_ELEMENT) {
if (wantnl) {
fprintf(f, ",\n");
adds(",\n");
nospace = false;
} else {
fprintf(f, ", ");
adds(", ");
}
wantnl = false;
state[state.size() - 1] = JSON_WRITE_ARRAY_ELEMENT;
@@ -56,7 +56,7 @@ void json_writer::json_adjust() {
void json_writer::json_write_array() {
json_adjust();
fprintf(f, "[");
addc('[');
state.push_back(JSON_WRITE_ARRAY);
}
@@ -72,10 +72,10 @@ void json_writer::json_end_array() {
if (tok == JSON_WRITE_ARRAY || tok == JSON_WRITE_ARRAY_ELEMENT) {
if (!nospace) {
fprintf(f, " ");
addc(' ');
}
nospace = false;
fprintf(f, "]");
addc(']');
} else {
fprintf(stderr, "End JSON array with unexpected state\n");
exit(EXIT_FAILURE);
@@ -84,7 +84,7 @@ void json_writer::json_end_array() {
void json_writer::json_write_hash() {
json_adjust();
fprintf(f, "{");
addc('{');
state.push_back(JSON_WRITE_HASH);
}
@@ -100,16 +100,16 @@ void json_writer::json_end_hash() {
if (tok == JSON_WRITE_HASH) {
if (!nospace) {
fprintf(f, " "); // Preserve accidental extra space from before
adds(" "); // Preserve accidental extra space from before
}
nospace = false;
fprintf(f, "}");
addc('}');
} else if (tok == JSON_WRITE_HASH_VALUE) {
if (!nospace) {
fprintf(f, " ");
addc(' ');
}
nospace = false;
fprintf(f, "}");
addc('}');
} else {
fprintf(stderr, "End JSON hash with unexpected state\n");
exit(EXIT_FAILURE);
@@ -119,68 +119,68 @@ void json_writer::json_end_hash() {
void json_writer::json_write_string(std::string const &s) {
json_adjust();
putc('"', f);
addc('"');
for (size_t i = 0; i < s.size(); i++) {
if (s[i] == '\\' || s[i] == '"') {
fprintf(f, "\\%c", s[i]);
aprintf("\\%c", s[i]);
} else if ((unsigned char) s[i] < ' ') {
fprintf(f, "\\u%04x", s[i]);
aprintf("\\u%04x", s[i]);
} else {
putc(s[i], f);
addc(s[i]);
}
}
putc('"', f);
addc('"');
}
void json_writer::json_write_number(double d) {
json_adjust();
fputs(milo::dtoa_milo(d).c_str(), f);
adds(milo::dtoa_milo(d).c_str());
}
// Just to avoid json_writer:: changing expected output format
void json_writer::json_write_float(double d) {
json_adjust();
fprintf(f, "%f", d);
aprintf("%f", d);
}
void json_writer::json_write_unsigned(unsigned long long v) {
json_adjust();
fprintf(f, "%llu", v);
aprintf("%llu", v);
}
void json_writer::json_write_signed(long long v) {
json_adjust();
fprintf(f, "%lld", v);
aprintf("%lld", v);
}
void json_writer::json_write_stringified(std::string const &s) {
json_adjust();
fputs(s.c_str(), f);
adds(s);
}
void json_writer::json_write_bool(bool b) {
json_adjust();
if (b) {
fputs("true", f);
adds("true");
} else {
fputs("false", f);
adds("false");
}
}
void json_writer::json_write_null() {
json_adjust();
fputs("null", f);
adds("null");
}
void json_writer::json_write_newline() {
putc('\n', f);
addc('\n');
nospace = true;
}
@@ -188,6 +188,37 @@ void json_writer::json_comma_newline() {
wantnl = true;
}
void json_writer::aprintf(const char *format, ...) {
va_list ap;
char *tmp;
va_start(ap, format);
if (vasprintf(&tmp, format, ap) < 0) {
fprintf(stderr, "memory allocation failure\n");
exit(EXIT_FAILURE);
}
va_end(ap);
adds(std::string(tmp, strlen(tmp)));
free(tmp);
}
void json_writer::addc(char c) {
if (f != NULL) {
putc(c, f);
} else if (s != NULL) {
s->push_back(c);
}
}
void json_writer::adds(std::string const &str) {
if (f != NULL) {
fputs(str.c_str(), f);
} else if (s != NULL) {
s->append(str);
}
}
struct lonlat {
int op;
double lon;