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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_textprinter.h"
#include <inttypes.h>
#include <stdlib.h>
#include <ctype.h>
struct _upb_textprinter {
upb_bytesink *bytesink;
int indent_depth;
bool single_line;
upb_status status;
};
#define CHECK(x) if ((x) < 0) goto err;
static int upb_textprinter_putescaped(upb_textprinter *p, upb_string *str,
bool preserve_utf8) {
// Based on CEscapeInternal() from Google's protobuf release.
// TODO; we could write directly into a bytesink's buffer instead.
char dstbuf[4096], *dst = dstbuf, *dstend = dstbuf + sizeof(dstbuf);
const char *src = upb_string_getrobuf(str), *end = src + upb_string_len(str);
// I think hex is prettier and more useful, but proto2 uses octal; should
// investigate whether it can parse hex also.
bool use_hex = false;
bool last_hex_escape = false; // true if last output char was \xNN
for (; src < end; src++) {
if (dstend - dst < 4) {
upb_string str = UPB_STACK_STRING_LEN(dstbuf, dst - dstbuf);
CHECK(upb_bytesink_putstr(p->bytesink, &str, &p->status));
dst = dstbuf;
}
bool is_hex_escape = false;
switch (*src) {
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 src 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)*src < 0x80) &&
(!isprint(*src) || (last_hex_escape && isxdigit(*src)))) {
sprintf(dst, (use_hex ? "\\x%02x" : "\\%03o"), (uint8_t)*src);
is_hex_escape = use_hex;
dst += 4;
} else {
*(dst++) = *src; break;
}
}
last_hex_escape = is_hex_escape;
}
// Flush remaining data.
upb_string outstr = UPB_STACK_STRING_LEN(dstbuf, dst - dstbuf);
CHECK(upb_bytesink_putstr(p->bytesink, &outstr, &p->status));
return 0;
err:
return -1;
}
static int upb_textprinter_indent(upb_textprinter *p) {
if(!p->single_line)
for(int i = 0; i < p->indent_depth; i++)
CHECK(upb_bytesink_putstr(p->bytesink, UPB_STRLIT(" "), &p->status));
return 0;
err:
return -1;
}
static int upb_textprinter_endfield(upb_textprinter *p) {
if(p->single_line) {
CHECK(upb_bytesink_putstr(p->bytesink, UPB_STRLIT(" "), &p->status));
} else {
CHECK(upb_bytesink_putstr(p->bytesink, UPB_STRLIT("\n"), &p->status));
}
return 0;
err:
return -1;
}
static upb_flow_t upb_textprinter_value(void *_p, upb_value fval,
upb_value val) {
upb_textprinter *p = _p;
upb_fielddef *f = upb_value_getfielddef(fval);
upb_textprinter_indent(p);
CHECK(upb_bytesink_printf(p->bytesink, &p->status, UPB_STRFMT ": ", UPB_STRARG(f->name)));
#define CASE(fmtstr, member) \
CHECK(upb_bytesink_printf(p->bytesink, &p->status, fmtstr, upb_value_get ## member(val))); break;
switch(f->type) {
case UPB_TYPE(DOUBLE):
CASE("%0.f", double);
case UPB_TYPE(FLOAT):
CASE("%0.f", float)
case UPB_TYPE(INT64):
case UPB_TYPE(SFIXED64):
case UPB_TYPE(SINT64):
CASE("%" PRId64, int64)
case UPB_TYPE(UINT64):
case UPB_TYPE(FIXED64):
CASE("%" PRIu64, uint64)
case UPB_TYPE(UINT32):
case UPB_TYPE(FIXED32):
CASE("%" PRIu32, uint32);
case UPB_TYPE(ENUM): {
upb_enumdef *enum_def = upb_downcast_enumdef(f->def);
upb_string *enum_label =
upb_enumdef_iton(enum_def, upb_value_getint32(val));
if (enum_label) {
// We found a corresponding string for this enum. Otherwise we fall
// through to the int32 code path.
CHECK(upb_bytesink_putstr(p->bytesink, enum_label, &p->status));
break;
}
}
case UPB_TYPE(INT32):
case UPB_TYPE(SFIXED32):
case UPB_TYPE(SINT32):
CASE("%" PRId32, int32)
case UPB_TYPE(BOOL):
CASE("%hhu", bool);
case UPB_TYPE(STRING):
case UPB_TYPE(BYTES):
CHECK(upb_bytesink_putstr(p->bytesink, UPB_STRLIT("\""), &p->status));
CHECK(upb_textprinter_putescaped(p, upb_value_getstr(val),
f->type == UPB_TYPE(STRING)));
CHECK(upb_bytesink_putstr(p->bytesink, UPB_STRLIT("\""), &p->status));
break;
}
upb_textprinter_endfield(p);
return UPB_CONTINUE;
err:
return UPB_BREAK;
}
static upb_sflow_t upb_textprinter_startsubmsg(void *_p, upb_value fval) {
upb_textprinter *p = _p;
upb_fielddef *f = upb_value_getfielddef(fval);
upb_textprinter_indent(p);
CHECK(upb_bytesink_printf(p->bytesink, &p->status, UPB_STRFMT " {", UPB_STRARG(f->name)));
if(!p->single_line) upb_bytesink_putstr(p->bytesink, UPB_STRLIT("\n"), &p->status);
p->indent_depth++;
return UPB_CONTINUE_WITH(_p);
err:
return UPB_S_BREAK;
}
static upb_flow_t upb_textprinter_endsubmsg(void *_p, upb_value fval) {
(void)fval;
upb_textprinter *p = _p;
p->indent_depth--;
upb_textprinter_indent(p);
upb_bytesink_putstr(p->bytesink, UPB_STRLIT("}"), &p->status);
upb_textprinter_endfield(p);
return UPB_CONTINUE;
}
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->bytesink = sink;
p->single_line = single_line;
p->indent_depth = 0;
}
void upb_textprinter_reghandlers(upb_handlers *h) {
upb_register_all(h,
NULL, // startmsg
NULL, // endmsg
upb_textprinter_value,
upb_textprinter_startsubmsg,
upb_textprinter_endsubmsg,
NULL // Unknown
);
}
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