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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*/
#include "upb/pb/textprinter.h"
#include <ctype.h>
#include <float.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct _upb_textprinter {
upb_bytesink *sink;
int indent_depth;
bool single_line;
upb_status status;
};
#define CHECK(x) if ((x) < 0) goto err;
static int indent(upb_textprinter *p) {
if (!p->single_line)
CHECK(upb_bytesink_putrepeated(p->sink, ' ', p->indent_depth*2));
return 0;
err:
return -1;
}
static int endfield(upb_textprinter *p) {
CHECK(upb_bytesink_putc(p->sink, p->single_line ? ' ' : '\n'));
return 0;
err:
return -1;
}
static int putescaped(upb_textprinter *p, const char *buf, size_t len,
bool preserve_utf8) {
// Based on CEscapeInternal() from Google's protobuf release.
char dstbuf[4096], *dst = dstbuf, *dstend = dstbuf + sizeof(dstbuf);
const char *end = buf + len;
// I think hex is prettier and more useful, but proto2 uses octal; should
// investigate whether it can parse hex also.
const bool use_hex = false;
bool last_hex_escape = false; // true if last output char was \xNN
for (; buf < end; buf++) {
if (dstend - dst < 4) {
CHECK(upb_bytesink_write(p->sink, dstbuf, dst - dstbuf));
dst = dstbuf;
}
bool is_hex_escape = false;
switch (*buf) {
case '\n': *(dst++) = '\\'; *(dst++) = 'n'; break;
case '\r': *(dst++) = '\\'; *(dst++) = 'r'; break;
case '\t': *(dst++) = '\\'; *(dst++) = 't'; break;
case '\"': *(dst++) = '\\'; *(dst++) = '\"'; break;
case '\'': *(dst++) = '\\'; *(dst++) = '\''; break;
case '\\': *(dst++) = '\\'; *(dst++) = '\\'; break;
default:
// Note that if we emit \xNN and the buf character after that is a hex
// digit then that digit must be escaped too to prevent it being
// interpreted as part of the character code by C.
if ((!preserve_utf8 || (uint8_t)*buf < 0x80) &&
(!isprint(*buf) || (last_hex_escape && isxdigit(*buf)))) {
sprintf(dst, (use_hex ? "\\x%02x" : "\\%03o"), (uint8_t)*buf);
is_hex_escape = use_hex;
dst += 4;
} else {
*(dst++) = *buf; break;
}
}
last_hex_escape = is_hex_escape;
}
// Flush remaining data.
CHECK(upb_bytesink_write(p->sink, dst, dst - dstbuf));
return 0;
err:
return -1;
}
#define TYPE(name, ctype, fmt) \
static bool put ## name(void *_p, void *fval, ctype val) { \
upb_textprinter *p = _p; \
const upb_fielddef *f = fval; \
CHECK(indent(p)); \
CHECK(upb_bytesink_writestr(p->sink, upb_fielddef_name(f))); \
CHECK(upb_bytesink_writestr(p->sink, ": ")); \
CHECK(upb_bytesink_printf(p->sink, fmt, val)); \
CHECK(endfield(p)); \
return true; \
err: \
return false; \
}
#define STRINGIFY_HELPER(x) #x
#define STRINGIFY_MACROVAL(x) STRINGIFY_HELPER(x)
TYPE(int32, int32_t, "%" PRId32)
TYPE(int64, int64_t, "%" PRId64)
TYPE(uint32, uint32_t, "%" PRIu32);
TYPE(uint64, uint64_t, "%" PRIu64)
TYPE(float, float, "%." STRINGIFY_MACROVAL(FLT_DIG) "g")
TYPE(double, double, "%." STRINGIFY_MACROVAL(DBL_DIG) "g")
TYPE(bool, bool, "%hhu");
// Output a symbolic value from the enum if found, else just print as int32.
static bool putenum(void *_p, void *fval, int32_t val) {
upb_textprinter *p = _p;
const upb_fielddef *f = fval;
const upb_enumdef *enum_def = upb_downcast_enumdef(upb_fielddef_subdef(f));
const char *label = upb_enumdef_iton(enum_def, val);
if (label) {
CHECK(upb_bytesink_writestr(p->sink, label));
} else {
CHECK(putint32(_p, fval, val));
}
return true;
err:
return false;
}
static void *startstr(void *_p, void *fval, size_t size_hint) {
UPB_UNUSED(size_hint);
UPB_UNUSED(fval);
upb_textprinter *p = _p;
CHECK(upb_bytesink_putc(p->sink, '"'));
return p;
err:
return UPB_BREAK;
}
static bool endstr(void *_p, void *fval) {
UPB_UNUSED(fval);
upb_textprinter *p = _p;
CHECK(upb_bytesink_putc(p->sink, '"'));
return true;
err:
return false;
}
static size_t putstr(void *_p, void *fval, const char *buf, size_t len) {
upb_textprinter *p = _p;
const upb_fielddef *f = fval;
CHECK(putescaped(p, buf, len, upb_fielddef_type(f) == UPB_TYPE(STRING)));
return len;
err:
return 0;
}
static void *startsubmsg(void *_p, void *fval) {
upb_textprinter *p = _p;
const upb_fielddef *f = fval;
CHECK(indent(p));
CHECK(upb_bytesink_printf(p->sink, "%s {", upb_fielddef_name(f)));
if (!p->single_line)
CHECK(upb_bytesink_putc(p->sink, '\n'));
p->indent_depth++;
return _p;
err:
return UPB_BREAK;
}
static bool endsubmsg(void *_p, void *fval) {
UPB_UNUSED(fval);
upb_textprinter *p = _p;
p->indent_depth--;
CHECK(indent(p));
CHECK(upb_bytesink_putc(p->sink, '}'));
CHECK(endfield(p));
return true;
err:
return false;
}
upb_textprinter *upb_textprinter_new() {
upb_textprinter *p = malloc(sizeof(*p));
return p;
}
void upb_textprinter_free(upb_textprinter *p) { free(p); }
void upb_textprinter_reset(upb_textprinter *p, upb_bytesink *sink,
bool single_line) {
p->sink = sink;
p->single_line = single_line;
p->indent_depth = 0;
}
static void onmreg(void *c, upb_handlers *h) {
(void)c;
const upb_msgdef *m = upb_handlers_msgdef(h);
upb_msg_iter i;
for(upb_msg_begin(&i, m); !upb_msg_done(&i); upb_msg_next(&i)) {
upb_fielddef *f = upb_msg_iter_field(&i);
switch (upb_fielddef_type(f)) {
case UPB_TYPE_INT32:
case UPB_TYPE_SINT32:
case UPB_TYPE_SFIXED32:
upb_handlers_setint32(h, f, putint32, f, NULL);
break;
case UPB_TYPE_SINT64:
case UPB_TYPE_SFIXED64:
case UPB_TYPE_INT64:
upb_handlers_setint64(h, f, putint64, f, NULL);
break;
case UPB_TYPE_UINT32:
case UPB_TYPE_FIXED32:
upb_handlers_setuint32(h, f, putuint32, f, NULL);
break;
case UPB_TYPE_UINT64:
case UPB_TYPE_FIXED64:
upb_handlers_setuint64(h, f, putuint64, f, NULL);
break;
case UPB_TYPE_FLOAT:
upb_handlers_setfloat(h, f, putfloat, f, NULL);
break;
case UPB_TYPE_DOUBLE:
upb_handlers_setdouble(h, f, putdouble, f, NULL);
break;
case UPB_TYPE_BOOL:
upb_handlers_setbool(h, f, putbool, f, NULL);
break;
case UPB_TYPE_STRING:
case UPB_TYPE_BYTES:
upb_handlers_setstartstr(h, f, startstr, f, NULL);
upb_handlers_setstring(h, f, putstr, f, NULL);
upb_handlers_setendstr(h, f, endstr, f, NULL);
break;
case UPB_TYPE_GROUP:
case UPB_TYPE_MESSAGE:
upb_handlers_setstartsubmsg(h, f, &startsubmsg, f, NULL);
upb_handlers_setendsubmsg(h, f, &endsubmsg, f, NULL);
break;
case UPB_TYPE_ENUM:
upb_handlers_setint32(h, f, putenum, f, NULL);
default:
assert(false);
break;
}
}
}
const upb_handlers *upb_textprinter_newhandlers(const void *owner,
const upb_msgdef *m) {
return upb_handlers_newfrozen(m, owner, &onmreg, NULL);
}
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