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json.cpp
1413 lines (1178 loc) · 37.5 KB
/
json.cpp
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/*************** json CPP Declares Source Code File (.H) ***************/
/* Name: json.cpp Version 1.3 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 2014 - 2017 */
/* */
/* This file contains the JSON classes functions. */
/***********************************************************************/
/***********************************************************************/
/* Include relevant sections of the MariaDB header file. */
/***********************************************************************/
#include <my_global.h>
/***********************************************************************/
/* Include application header files: */
/* global.h is header containing all global declarations. */
/* plgdbsem.h is header containing the DB application declarations. */
/* xjson.h is header containing the JSON classes declarations. */
/***********************************************************************/
#include "global.h"
#include "plgdbsem.h"
#include "json.h"
#define ARGS MY_MIN(24,len-i),s+MY_MAX(i-3,0)
#if defined(__WIN__)
#define EL "\r\n"
#else
#define EL "\n"
#undef SE_CATCH // Does not work for Linux
#endif
#if defined(SE_CATCH)
/**************************************************************************/
/* This is the support of catching C interrupts to prevent crashes. */
/**************************************************************************/
#include <eh.h>
class SE_Exception {
public:
SE_Exception(unsigned int n, PEXCEPTION_RECORD p) : nSE(n), eRec(p) {}
~SE_Exception() {}
unsigned int nSE;
PEXCEPTION_RECORD eRec;
}; // end of class SE_Exception
void trans_func(unsigned int u, _EXCEPTION_POINTERS* pExp)
{
throw SE_Exception(u, pExp->ExceptionRecord);
} // end of trans_func
char *GetExceptionDesc(PGLOBAL g, unsigned int e);
#endif // SE_CATCH
/***********************************************************************/
/* Parse a json string. */
/* Note: when pretty is not known, the caller set pretty to 3. */
/***********************************************************************/
PJSON ParseJson(PGLOBAL g, char *s, int len, int *ptyp, bool *comma)
{
int i, rc, pretty = (ptyp) ? *ptyp : 3;
bool b = false, pty[3] = {true, true, true};
PJSON jsp = NULL;
STRG src;
if (trace)
htrc("ParseJson: s=%.10s len=%d\n", s, len);
if (!s || !len) {
strcpy(g->Message, "Void JSON object");
return NULL;
} else if (comma)
*comma = false;
src.str = s;
src.len = len;
// Trying to guess the pretty format
if (s[0] == '[' && (s[1] == '\n' || (s[1] == '\r' && s[2] == '\n')))
pty[0] = false;
// Save stack and allocation environment and prepare error return
if (g->jump_level == MAX_JUMP) {
strcpy(g->Message, MSG(TOO_MANY_JUMPS));
return NULL;
} // endif jump_level
#if defined(SE_CATCH)
// Let's try to recover from any kind of interrupt
_se_translator_function f = _set_se_translator(trans_func);
try {
#endif // SE_CATCH --------------------- try section --------------------
if ((rc = setjmp(g->jumper[++g->jump_level])) != 0) {
goto err;
} // endif rc
#if defined(SE_CATCH) // ------------- end of try section -----------------
} catch (SE_Exception e) {
sprintf(g->Message, "ParseJson: exception doing setjmp: %s (rc=%hd)",
GetExceptionDesc(g, e.nSE), e.nSE);
_set_se_translator(f);
goto err;
} catch (...) {
strcpy(g->Message, "Exception doing setjmp");
_set_se_translator(f);
goto err;
} // end of try-catches
_set_se_translator(f);
#endif // SE_CATCH
for (i = 0; i < len; i++)
switch (s[i]) {
case '[':
if (jsp)
goto tryit;
else if (!(jsp = ParseArray(g, ++i, src, pty)))
goto err;
break;
case '{':
if (jsp)
goto tryit;
else if (!(jsp = ParseObject(g, ++i, src, pty)))
goto err;
break;
case ' ':
case '\t':
case '\n':
case '\r':
break;
case ',':
if (jsp && (pretty == 1 || pretty == 3)) {
if (comma)
*comma = true;
pty[0] = pty[2] = false;
break;
} // endif pretty
sprintf(g->Message, "Unexpected ',' (pretty=%d)", pretty);
goto err;
case '(':
b = true;
break;
case ')':
if (b) {
b = false;
break;
} // endif b
default:
if (jsp)
goto tryit;
else if (!(jsp = ParseValue(g, i, src, pty)))
goto err;
break;
}; // endswitch s[i]
if (!jsp)
sprintf(g->Message, "Invalid Json string '%.*s'", 50, s);
else if (ptyp && pretty == 3) {
*ptyp = 3; // Not recognized pretty
for (i = 0; i < 3; i++)
if (pty[i]) {
*ptyp = i;
break;
} // endif pty
} // endif ptyp
g->jump_level--;
return jsp;
tryit:
if (pty[0] && (!pretty || pretty > 2)) {
if ((jsp = ParseArray(g, (i = 0), src, pty)) && ptyp && pretty == 3)
*ptyp = (pty[0]) ? 0 : 3;
g->jump_level--;
return jsp;
} else
strcpy(g->Message, "More than one item in file");
err:
g->jump_level--;
return NULL;
} // end of ParseJson
/***********************************************************************/
/* Parse a JSON Array. */
/***********************************************************************/
PJAR ParseArray(PGLOBAL g, int& i, STRG& src, bool *pty)
{
char *s = src.str;
int len = src.len;
int level = 0;
bool b = (!i);
PJAR jarp = new(g) JARRAY;
PJVAL jvp = NULL;
for (; i < len; i++)
switch (s[i]) {
case ',':
if (level < 2) {
sprintf(g->Message, "Unexpected ',' near %.*s",ARGS);
return NULL;
} else
level = 1;
break;
case ']':
if (level == 1) {
sprintf(g->Message, "Unexpected ',]' near %.*s", ARGS);
return NULL;
} // endif level
jarp->InitArray(g);
return jarp;
case '\n':
if (!b)
pty[0] = pty[1] = false;
case '\r':
case ' ':
case '\t':
break;
default:
if (level == 2) {
sprintf(g->Message, "Unexpected value near %.*s", ARGS);
return NULL;
} else if ((jvp = ParseValue(g, i, src, pty)))
jarp->AddValue(g, jvp);
else
return NULL;
level = (b) ? 1 : 2;
break;
}; // endswitch s[i]
if (b) {
// Case of Pretty == 0
jarp->InitArray(g);
return jarp;
} // endif b
strcpy(g->Message, "Unexpected EOF in array");
return NULL;
} // end of ParseArray
/***********************************************************************/
/* Parse a JSON Object. */
/***********************************************************************/
PJOB ParseObject(PGLOBAL g, int& i, STRG& src, bool *pty)
{
PSZ key;
char *s = src.str;
int len = src.len;
int level = 0;
PJOB jobp = new(g) JOBJECT;
PJPR jpp = NULL;
for (; i < len; i++)
switch (s[i]) {
case '"':
if (level < 2) {
if ((key = ParseString(g, ++i, src))) {
jpp = jobp->AddPair(g, key);
level = 1;
} else
return NULL;
} else {
sprintf(g->Message, "misplaced string near %.*s", ARGS);
return NULL;
} // endif level
break;
case ':':
if (level == 1) {
if (!(jpp->Val = ParseValue(g, ++i, src, pty)))
return NULL;
level = 2;
} else {
sprintf(g->Message, "Unexpected ':' near %.*s", ARGS);
return NULL;
} // endif level
break;
case ',':
if (level < 2) {
sprintf(g->Message, "Unexpected ',' near %.*s", ARGS);
return NULL;
} else
level = 1;
break;
case '}':
if (level == 1) {
sprintf(g->Message, "Unexpected '}' near %.*s", ARGS);
return NULL;
} // endif level
return jobp;
case '\n':
pty[0] = pty[1] = false;
case '\r':
case ' ':
case '\t':
break;
default:
sprintf(g->Message, "Unexpected character '%c' near %.*s",
s[i], ARGS);
return NULL;
}; // endswitch s[i]
strcpy(g->Message, "Unexpected EOF in Object");
return NULL;
} // end of ParseObject
/***********************************************************************/
/* Parse a JSON Value. */
/***********************************************************************/
PJVAL ParseValue(PGLOBAL g, int& i, STRG& src, bool *pty)
{
char *strval, *s = src.str;
int n, len = src.len;
PJVAL jvp = new(g) JVALUE;
for (; i < len; i++)
switch (s[i]) {
case '\n':
pty[0] = pty[1] = false;
case '\r':
case ' ':
case '\t':
break;
default:
goto suite;
} // endswitch
suite:
switch (s[i]) {
case '[':
if (!(jvp->Jsp = ParseArray(g, ++i, src, pty)))
return NULL;
break;
case '{':
if (!(jvp->Jsp = ParseObject(g, ++i, src, pty)))
return NULL;
break;
case '"':
if ((strval = ParseString(g, ++i, src)))
jvp->Value = AllocateValue(g, strval, TYPE_STRING);
else
return NULL;
break;
case 't':
if (!strncmp(s + i, "true", 4)) {
n = 1;
jvp->Value = AllocateValue(g, &n, TYPE_TINY);
i += 3;
} else
goto err;
break;
case 'f':
if (!strncmp(s + i, "false", 5)) {
n = 0;
jvp->Value = AllocateValue(g, &n, TYPE_TINY);
i += 4;
} else
goto err;
break;
case 'n':
if (!strncmp(s + i, "null", 4))
i += 3;
else
goto err;
break;
case '-':
default:
if (s[i] == '-' || isdigit(s[i])) {
if (!(jvp->Value = ParseNumeric(g, i, src)))
goto err;
} else
goto err;
}; // endswitch s[i]
return jvp;
err:
sprintf(g->Message, "Unexpected character '%c' near %.*s",
s[i], ARGS);
return NULL;
} // end of ParseValue
/***********************************************************************/
/* Unescape and parse a JSON string. */
/***********************************************************************/
char *ParseString(PGLOBAL g, int& i, STRG& src)
{
char *s = src.str;
uchar *p;
int n = 0, len = src.len;
// Be sure of memory availability
if (len + 1 - i > (signed)((PPOOLHEADER)g->Sarea)->FreeBlk) {
strcpy(g->Message, "ParseString: Out of memory");
return NULL;
} // endif len
// The size to allocate is not known yet
p = (uchar*)PlugSubAlloc(g, NULL, 0);
for (; i < len; i++)
switch (s[i]) {
case '"':
p[n++] = 0;
PlugSubAlloc(g, NULL, n);
return (char*)p;
case '\\':
if (++i < len) {
if (s[i] == 'u') {
if (len - i > 5) {
// if (charset == utf8) {
char xs[5];
uint hex;
xs[0] = s[++i];
xs[1] = s[++i];
xs[2] = s[++i];
xs[3] = s[++i];
xs[4] = 0;
hex = strtoul(xs, NULL, 16);
if (hex < 0x80) {
p[n] = (uchar)hex;
} else if (hex < 0x800) {
p[n++] = (uchar)(0xC0 | (hex >> 6));
p[n] = (uchar)(0x80 | (hex & 0x3F));
} else if (hex < 0x10000) {
p[n++] = (uchar)(0xE0 | (hex >> 12));
p[n++] = (uchar)(0x80 | ((hex >> 6) & 0x3f));
p[n] = (uchar)(0x80 | (hex & 0x3f));
} else
p[n] = '?';
#if 0
} else {
char xs[3];
UINT hex;
i += 2;
xs[0] = s[++i];
xs[1] = s[++i];
xs[2] = 0;
hex = strtoul(xs, NULL, 16);
p[n] = (char)hex;
} // endif charset
#endif // 0
} else
goto err;
} else switch(s[i]) {
case 't': p[n] = '\t'; break;
case 'n': p[n] = '\n'; break;
case 'r': p[n] = '\r'; break;
case 'b': p[n] = '\b'; break;
case 'f': p[n] = '\f'; break;
default: p[n] = s[i]; break;
} // endswitch
n++;
} else
goto err;
break;
default:
p[n++] = s[i];
break;
}; // endswitch s[i]
err:
strcpy(g->Message, "Unexpected EOF in String");
return NULL;
} // end of ParseString
/***********************************************************************/
/* Parse a JSON numeric value. */
/***********************************************************************/
PVAL ParseNumeric(PGLOBAL g, int& i, STRG& src)
{
char *s = src.str, buf[50];
int n = 0, len = src.len;
short nd = 0;
bool has_dot = false;
bool has_e = false;
bool found_digit = false;
PVAL valp = NULL;
for (; i < len; i++) {
switch (s[i]) {
case '.':
if (!found_digit || has_dot || has_e)
goto err;
has_dot = true;
break;
case 'e':
case 'E':
if (!found_digit || has_e)
goto err;
has_e = true;
found_digit = false;
break;
case '+':
if (!has_e)
goto err;
// passthru
case '-':
if (found_digit)
goto err;
break;
default:
if (isdigit(s[i])) {
if (has_dot && !has_e)
nd++; // Number of decimals
found_digit = true;
} else
goto fin;
}; // endswitch s[i]
buf[n++] = s[i];
} // endfor i
fin:
if (found_digit) {
buf[n] = 0;
if (has_dot || has_e) {
double dv = strtod(buf, NULL);
valp = AllocateValue(g, &dv, TYPE_DOUBLE, nd);
} else {
long long iv = strtoll(buf, NULL, 10);
valp = AllocateValue(g, &iv, TYPE_BIGINT);
} // endif has
i--; // Unstack following character
return valp;
} else {
strcpy(g->Message, "No digit found");
return NULL;
} // endif found_digit
err:
strcpy(g->Message, "Unexpected EOF in number");
return NULL;
} // end of ParseNumeric
/***********************************************************************/
/* Serialize a JSON tree: */
/***********************************************************************/
PSZ Serialize(PGLOBAL g, PJSON jsp, char *fn, int pretty)
{
PSZ str = NULL;
bool b = false, err = true;
JOUT *jp;
FILE *fs = NULL;
g->Message[0] = 0;
// Save stack and allocation environment and prepare error return
if (g->jump_level == MAX_JUMP) {
strcpy(g->Message, MSG(TOO_MANY_JUMPS));
return NULL;
} // endif jump_level
if (setjmp(g->jumper[++g->jump_level])) {
str = NULL;
goto fin;
} // endif jmp
if (!jsp) {
strcpy(g->Message, "Null json tree");
goto fin;
} else if (!fn) {
// Serialize to a string
jp = new(g) JOUTSTR(g);
b = pretty == 1;
} else {
if (!(fs = fopen(fn, "wb"))) {
sprintf(g->Message, MSG(OPEN_MODE_ERROR),
"w", (int)errno, fn);
strcat(strcat(g->Message, ": "), strerror(errno));
goto fin;;
} else if (pretty >= 2) {
// Serialize to a pretty file
jp = new(g)JOUTPRT(g, fs);
} else {
// Serialize to a flat file
b = true;
jp = new(g)JOUTFILE(g, fs, pretty);
} // endif's
} // endif's
switch (jsp->GetType()) {
case TYPE_JAR:
err = SerializeArray(jp, (PJAR)jsp, b);
break;
case TYPE_JOB:
err = ((b && jp->Prty()) && jp->WriteChr('\t'));
err |= SerializeObject(jp, (PJOB)jsp);
break;
case TYPE_JVAL:
err = SerializeValue(jp, (PJVAL)jsp);
break;
default:
strcpy(g->Message, "Invalid json tree");
} // endswitch Type
if (fs) {
fputs(EL, fs);
fclose(fs);
str = (err) ? NULL : strcpy(g->Message, "Ok");
} else if (!err) {
str = ((JOUTSTR*)jp)->Strp;
jp->WriteChr('\0');
PlugSubAlloc(g, NULL, ((JOUTSTR*)jp)->N);
} else {
if (!g->Message[0])
strcpy(g->Message, "Error in Serialize");
} // endif's
fin:
g->jump_level--;
return str;
} // end of Serialize
/***********************************************************************/
/* Serialize a JSON Array. */
/***********************************************************************/
bool SerializeArray(JOUT *js, PJAR jarp, bool b)
{
bool first = true;
if (b) {
if (js->Prty()) {
if (js->WriteChr('['))
return true;
else if (js->Prty() == 1 && (js->WriteStr(EL) || js->WriteChr('\t')))
return true;
} // endif Prty
} else if (js->WriteChr('['))
return true;
for (int i = 0; i < jarp->size(); i++) {
if (first)
first = false;
else if ((!b || js->Prty()) && js->WriteChr(','))
return true;
else if (b) {
if (js->Prty() < 2 && js->WriteStr(EL))
return true;
else if (js->Prty() == 1 && js->WriteChr('\t'))
return true;
} // endif b
if (SerializeValue(js, jarp->GetValue(i)))
return true;
} // endfor i
if (b && js->Prty() == 1 && js->WriteStr(EL))
return true;
return ((!b || js->Prty()) && js->WriteChr(']'));
} // end of SerializeArray
/***********************************************************************/
/* Serialize a JSON Object. */
/***********************************************************************/
bool SerializeObject(JOUT *js, PJOB jobp)
{
bool first = true;
if (js->WriteChr('{'))
return true;
for (PJPR pair = jobp->First; pair; pair = pair->Next) {
if (first)
first = false;
else if (js->WriteChr(','))
return true;
if (js->WriteChr('"') ||
js->WriteStr(pair->Key) ||
js->WriteChr('"') ||
js->WriteChr(':') ||
SerializeValue(js, pair->Val))
return true;
} // endfor i
return js->WriteChr('}');
} // end of SerializeObject
/***********************************************************************/
/* Serialize a JSON Value. */
/***********************************************************************/
bool SerializeValue(JOUT *js, PJVAL jvp)
{
PJAR jap;
PJOB jop;
PVAL valp;
if ((jap = jvp->GetArray()))
return SerializeArray(js, jap, false);
else if ((jop = jvp->GetObject()))
return SerializeObject(js, jop);
else if (!(valp = jvp->Value) || valp->IsNull())
return js->WriteStr("null");
else switch (valp->GetType()) {
case TYPE_TINY:
return js->WriteStr(valp->GetTinyValue() ? "true" : "false");
case TYPE_STRING:
return js->Escape(valp->GetCharValue());
default:
if (valp->IsTypeNum()) {
char buf[32];
return js->WriteStr(valp->GetCharString(buf));
} // endif valp
} // endswitch Type
strcpy(js->g->Message, "Unrecognized value");
return true;
} // end of SerializeValue
/* -------------------------- Class JOUTSTR -------------------------- */
/***********************************************************************/
/* JOUTSTR constructor. */
/***********************************************************************/
JOUTSTR::JOUTSTR(PGLOBAL g) : JOUT(g)
{
PPOOLHEADER pph = (PPOOLHEADER)g->Sarea;
N = 0;
Max = pph->FreeBlk;
Max = (Max > 32) ? Max - 32 : Max;
Strp = (char*)PlugSubAlloc(g, NULL, 0); // Size not know yet
} // end of JOUTSTR constructor
/***********************************************************************/
/* Concatenate a string to the Serialize string. */
/***********************************************************************/
bool JOUTSTR::WriteStr(const char *s)
{
if (s) {
size_t len = strlen(s);
if (N + len > Max)
return true;
memcpy(Strp + N, s, len);
N += len;
return false;
} else
return true;
} // end of WriteStr
/***********************************************************************/
/* Concatenate a character to the Serialize string. */
/***********************************************************************/
bool JOUTSTR::WriteChr(const char c)
{
if (N + 1 > Max)
return true;
Strp[N++] = c;
return false;
} // end of WriteChr
/***********************************************************************/
/* Escape and Concatenate a string to the Serialize string. */
/***********************************************************************/
bool JOUTSTR::Escape(const char *s)
{
WriteChr('"');
for (unsigned int i = 0; s[i]; i++)
switch (s[i]) {
case '"':
case '\\':
case '\t':
case '\n':
case '\r':
case '\b':
case '\f': WriteChr('\\');
// passthru
default:
WriteChr(s[i]);
break;
} // endswitch s[i]
WriteChr('"');
return false;
} // end of Escape
/* ------------------------- Class JOUTFILE -------------------------- */
/***********************************************************************/
/* Write a string to the Serialize file. */
/***********************************************************************/
bool JOUTFILE::WriteStr(const char *s)
{
// This is temporary
fputs(s, Stream);
return false;
} // end of WriteStr
/***********************************************************************/
/* Write a character to the Serialize file. */
/***********************************************************************/
bool JOUTFILE::WriteChr(const char c)
{
// This is temporary
fputc(c, Stream);
return false;
} // end of WriteChr
/***********************************************************************/
/* Escape and Concatenate a string to the Serialize string. */
/***********************************************************************/
bool JOUTFILE::Escape(const char *s)
{
// This is temporary
fputc('"', Stream);
for (unsigned int i = 0; s[i]; i++)
switch (s[i]) {
case '"': fputs("\\\"", Stream); break;
case '\\': fputs("\\\\", Stream); break;
case '\t': fputs("\\t", Stream); break;
case '\n': fputs("\\n", Stream); break;
case '\r': fputs("\\r", Stream); break;
case '\b': fputs("\\b", Stream); break;
case '\f': fputs("\\f", Stream); break;
default:
fputc(s[i], Stream);
break;
} // endswitch s[i]
fputc('"', Stream);
return false;
} // end of Escape
/* ------------------------- Class JOUTPRT --------------------------- */
/***********************************************************************/
/* Write a string to the Serialize pretty file. */
/***********************************************************************/
bool JOUTPRT::WriteStr(const char *s)
{
// This is temporary
if (B) {
fputs(EL, Stream);
M--;
for (int i = 0; i < M; i++)
fputc('\t', Stream);
B = false;
} // endif B
fputs(s, Stream);
return false;
} // end of WriteStr
/***********************************************************************/
/* Write a character to the Serialize pretty file. */
/***********************************************************************/
bool JOUTPRT::WriteChr(const char c)
{
switch (c) {
case ':':
fputs(": ", Stream);
break;
case '{':
case '[':
#if 0
if (M)
fputs(EL, Stream);
for (int i = 0; i < M; i++)
fputc('\t', Stream);
#endif // 0
fputc(c, Stream);
fputs(EL, Stream);
M++;
for (int i = 0; i < M; i++)
fputc('\t', Stream);
break;
case '}':
case ']':
M--;
fputs(EL, Stream);
for (int i = 0; i < M; i++)
fputc('\t', Stream);
fputc(c, Stream);
B = true;
break;
case ',':
fputc(c, Stream);
fputs(EL, Stream);
for (int i = 0; i < M; i++)
fputc('\t', Stream);
B = false;
break;
default:
fputc(c, Stream);
} // endswitch c
return false;
} // end of WriteChr
/* -------------------------- Class JOBJECT -------------------------- */
/***********************************************************************/
/* Add a new pair to an Object. */
/***********************************************************************/
PJPR JOBJECT::AddPair(PGLOBAL g, PSZ key)
{
PJPR jpp = new(g) JPAIR(key);
if (Last)
Last->Next = jpp;
else
First = jpp;
Last = jpp;
Size++;
return jpp;
} // end of AddPair
/***********************************************************************/
/* Return all keys as an array. */
/***********************************************************************/
PJAR JOBJECT::GetKeyList(PGLOBAL g)
{
PJAR jarp = new(g) JARRAY();
for (PJPR jpp = First; jpp; jpp = jpp->Next)
jarp->AddValue(g, new(g) JVALUE(g, jpp->GetKey()));
jarp->InitArray(g);
return jarp;
} // end of GetKeyList
/***********************************************************************/
/* Get the value corresponding to the given key. */
/***********************************************************************/
PJVAL JOBJECT::GetValue(const char* key)
{