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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 <ctype.h>
#include <float.h>
#include <inttypes.h>
#include <stdlib.h>
#include "upb/pb/textprinter.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 upb_textprinter_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 upb_textprinter_endfield(upb_textprinter *p) {
CHECK(upb_bytesink_putc(p->sink, p->single_line ? ' ' : '\n'));
return 0;
err:
return -1;
}
static int upb_textprinter_putescaped(upb_textprinter *p, const upb_strref *strref,
bool preserve_utf8) {
// Based on CEscapeInternal() from Google's protobuf release.
// TODO; we could read directly from a bytesrc's buffer instead.
// TODO; we could write strrefs to the sink when possible.
char dstbuf[4096], *dst = dstbuf, *dstend = dstbuf + sizeof(dstbuf);
char buf[strref->len], *src = buf;
char *end = src + strref->len;
upb_bytesrc_read(strref->bytesrc, strref->stream_offset, strref->len, buf);
// 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 (; src < end; src++) {
if (dstend - dst < 4) {
CHECK(upb_bytesink_write(p->sink, dstbuf, dst - dstbuf));
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.
CHECK(upb_bytesink_write(p->sink, dst, dst - dstbuf));
return 0;
err:
return -1;
}
#define TYPE(member, fmt) \
static upb_flow_t upb_textprinter_put ## member(void *_p, upb_value fval, \
upb_value val) { \
upb_textprinter *p = _p; \
const upb_fielddef *f = upb_value_getfielddef(fval); \
uint64_t start_ofs = upb_bytesink_getoffset(p->sink); \
CHECK(upb_textprinter_indent(p)); \
CHECK(upb_bytesink_writestr(p->sink, f->name)); \
CHECK(upb_bytesink_writestr(p->sink, ": ")); \
CHECK(upb_bytesink_printf(p->sink, fmt, upb_value_get ## member(val))); \
CHECK(upb_textprinter_endfield(p)); \
return UPB_CONTINUE; \
err: \
upb_bytesink_rewind(p->sink, start_ofs); \
return UPB_BREAK; \
}
#define STRINGIFY_HELPER(x) #x
#define STRINGIFY_MACROVAL(x) STRINGIFY_HELPER(x)
TYPE(double, "%." STRINGIFY_MACROVAL(DBL_DIG) "g")
TYPE(float, "%." STRINGIFY_MACROVAL(FLT_DIG) "g")
TYPE(int64, "%" PRId64)
TYPE(uint64, "%" PRIu64)
TYPE(int32, "%" PRId32)
TYPE(uint32, "%" PRIu32);
TYPE(bool, "%hhu");
// Output a symbolic value from the enum if found, else just print as int32.
static upb_flow_t upb_textprinter_putenum(void *_p, upb_value fval,
upb_value val) {
upb_textprinter *p = _p;
uint64_t start_ofs = upb_bytesink_getoffset(p->sink);
const upb_fielddef *f = upb_value_getfielddef(fval);
upb_enumdef *enum_def = upb_downcast_enumdef(f->def);
const char *label = upb_enumdef_iton(enum_def, upb_value_getint32(val));
if (label) {
CHECK(upb_bytesink_writestr(p->sink, label));
} else {
CHECK(upb_textprinter_putint32(_p, fval, val));
}
return UPB_CONTINUE;
err:
upb_bytesink_rewind(p->sink, start_ofs);
return UPB_BREAK;
}
static upb_flow_t upb_textprinter_putstr(void *_p, upb_value fval,
upb_value val) {
upb_textprinter *p = _p;
uint64_t start_ofs = upb_bytesink_getoffset(p->sink);
const upb_fielddef *f = upb_value_getfielddef(fval);
CHECK(upb_bytesink_putc(p->sink, '"'));
CHECK(upb_textprinter_putescaped(p, upb_value_getstrref(val),
f->type == UPB_TYPE(STRING)));
CHECK(upb_bytesink_putc(p->sink, '"'));
return UPB_CONTINUE;
err:
upb_bytesink_rewind(p->sink, start_ofs);
return UPB_BREAK;
}
static upb_sflow_t upb_textprinter_startsubmsg(void *_p, upb_value fval) {
upb_textprinter *p = _p;
uint64_t start_ofs = upb_bytesink_getoffset(p->sink);
const upb_fielddef *f = upb_value_getfielddef(fval);
CHECK(upb_textprinter_indent(p));
CHECK(upb_bytesink_printf(p->sink, "%s {", f->name));
if (!p->single_line)
CHECK(upb_bytesink_putc(p->sink, '\n'));
p->indent_depth++;
return UPB_CONTINUE_WITH(_p);
err:
upb_bytesink_rewind(p->sink, start_ofs);
return UPB_SBREAK;
}
static upb_flow_t upb_textprinter_endsubmsg(void *_p, upb_value fval) {
(void)fval;
upb_textprinter *p = _p;
uint64_t start_ofs = upb_bytesink_getoffset(p->sink);
p->indent_depth--;
CHECK(upb_textprinter_indent(p));
CHECK(upb_bytesink_putc(p->sink, '}'));
CHECK(upb_textprinter_endfield(p));
return UPB_CONTINUE;
err:
upb_bytesink_rewind(p->sink, start_ofs);
return UPB_BREAK;
}
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 upb_textprinter_onfreg(void *c, upb_fhandlers *fh, const upb_fielddef *f) {
(void)c;
upb_fhandlers_setstartsubmsg(fh, &upb_textprinter_startsubmsg);
upb_fhandlers_setendsubmsg(fh, &upb_textprinter_endsubmsg);
#define F(type) &upb_textprinter_put ## type
static upb_value_handler *fptrs[] = {NULL, F(double), F(float), F(int64),
F(uint64), F(int32), F(uint64), F(uint32), F(bool), F(str),
NULL, NULL, F(str), F(uint32), F(enum), F(int32),
F(int64), F(int32), F(int64)};
upb_fhandlers_setvalue(fh, fptrs[f->type]);
upb_value fval;
upb_value_setfielddef(&fval, f);
upb_fhandlers_setfval(fh, fval);
}
upb_mhandlers *upb_textprinter_reghandlers(upb_handlers *h, const upb_msgdef *m) {
return upb_handlers_regmsgdef(
h, m, NULL, &upb_textprinter_onfreg, NULL);
}
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