javascript-database/js_jsonparse.c at master · malbrain/javascript-database · GitHub

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#include<ctype.h>
#include"js.h"
#include"js_string.h"

value_tjs_strtod(uint8_t*buff, intlen);

typedefenum {
jsonElement,	// starting an Object/Array element
jsonLiteral,	// assembling literal token
jsonNumber, // assembling a number
jsonString, // assembling a string
jsonEnd// end numeric element
} jsonState;

//	append next element to the top-of-stack object/array

char*appendElement(pair_t*pair, value_t*next) {
switch (pair->value.type) {
casevt_object: {
if (pair->name.type==vt_string)
replaceValue(lookup(pair->value, pair->name, true, 0), *next);
else
break;

pair->name.bits=vt_undef;
returnNULL;
 }

casevt_array: {
vec_push(pair->value.aval->valuePtr, *next);
returnNULL;
 }

default:
break;
	}

return"JSON parse: not an object";
}

//	parse JSON string to value

value_tjsonParse(value_tv) {
jsonStatestate=jsonElement;
string_t*vstr=js_dbaddr(v, NULL);
pair_t*stack=NULL, pair;
boolnegative= false;
uint32_toff=0, len=0;
boolquot= false;
char*msg=NULL;
uint8_tbuff[64];
intch=0, nxt;
value_tnext[1];

next->bits=vt_undef;

while (true) {
if (state!=jsonEnd) {
if (v.type==vt_string) {
if (off<vstr->len)
ch=vstr->val[off++];
else
ch=EOF;
 } elseif (v.type==vt_file) {
ch=getc(v.file);
off++;
 } else {
msg="not file or string";
 goto jsonErr;
 }
 }

switch (state) {
casejsonLiteral:
if (ch==EOF) {
msg="end of file or string";
 goto jsonErr;
 }

if (isalpha(ch)) {
if (len<sizeof(buff)) {
buff[len++] =ch;
continue;
 }

msg="sizeof jsonLiteral > 64";
 goto jsonErr;
 }

if (len==4&& !memcmp(buff, "null", 4))
next->bits=vt_null;
elseif (len==4&& !memcmp(buff, "true", 4))
next->bits=vt_bool, next->boolean= true;
elseif (len==3&& !memcmp(buff, "NaN", 3))
next->bits=vt_nan;
elseif (len==8&& !memcmp(buff, "Infinity", 8))
next->bits=vt_infinite, next->negative= false;
elseif (len==9&& !memcmp(buff, "+Infinity", 9))
next->bits=vt_infinite, next->negative= false;
elseif (len==9&& !memcmp(buff, "-Infinity", 9))
next->bits=vt_infinite, next->negative= true;
elseif (len==5&& !memcmp(buff, "false", 5))
next->bits=vt_bool, next->boolean= false;
else {
msg="invalid Literal value";
 goto jsonErr;
 }

state=jsonEnd;
continue;

casejsonEnd:
state=jsonElement;

casejsonElement:
msg="invalid Element";

switch (ch) {
case' ':
case0x09:
case0x0a:
case0x0d:
continue;

case'-':
if (negative)
 goto jsonErr;

negative= true;
continue;

case'0':
case'1':
case'2':
case'3':
case'4':
case'5':
case'6':
case'7':
case'8':
case'9':
if (next->type!=vt_undef)
 goto jsonErr;

state=jsonNumber;

if (negative)
buff[0] ='-';
else
buff[0] ='+';

negative= false;
buff[1] =ch;
len=2;
continue;

case'"':
if (next->type!=vt_undef)
 goto jsonErr;

state=jsonString;
next->bits=vt_string;
next->addr=&EmptyStr;
len=0;
continue;

case'[':
if (next->type!=vt_undef)
 goto jsonErr;

pair.name.bits=vt_undef;
pair.value=newArray(array_value, 0);
vec_push(stack, pair);
continue;

case'{':
if (next->type!=vt_undef)
 goto jsonErr;

pair.name.bits=vt_undef;
pair.value=newObject(vt_object);
vec_push(stack, pair);
continue;

case':':
if (!vec_cnt(stack) ||vec_last(stack).value.type!=vt_object)
 goto jsonErr;

if (next->type==vt_string)
vec_last(stack).name=*next;
else
 goto jsonErr;

next->bits=vt_undef;
continue;

caseEOF:
if (vec_cnt(stack))
 goto jsonErr;

return*next;

case'}':
case']':
if (vec_cnt(stack))
pair=vec_pop(stack);
else
 goto jsonErr;

if (pair.value.type==vt_object&&ch!='}')
 goto jsonErr;
elseif (pair.value.type==vt_array&&ch!=']')
 goto jsonErr;

if (next->type!=vt_undef)
if ((msg=appendElement(&pair, next)))
 goto jsonErr;

*next=pair.value;
continue;

case',':
if (next->type==vt_undef) {
msg="invalid empty element";
 goto jsonErr;
 }

if ((msg=appendElement(&vec_last(stack), next)))
 goto jsonErr;

next->bits=vt_undef;
continue;
 }

state=jsonLiteral;

if (negative) {
buff[0] ='-';
buff[1] =ch;
len=2;
 } else {
buff[0] =ch;
len=1;
 }

negative= false;
continue;

casejsonString:
msg="Invalid String value";
nxt=ch;

if (quot) {
switch (ch) {
case'"': ch=0x100; break;
case'/': break;
case'\\': ch=0x100; break;
case'b': ch=0x08; break;
case'f': ch=0x0c; break;
case'n': ch=0x0a; break;
case'r': ch=0x0d; break;
case't': ch=0x08; break;
default:
msg="invalid Quoted character";
 goto jsonErr;
 }
quot= false;
 }

if (ch==EOF)
 goto jsonErr;

if (ch=='\\') {
quot= true;
continue;
 }

if (ch!='"') {
if (len==sizeof(buff)) {
valueCatStr(next, buff, len);
len=0;
 }

buff[len++] =nxt;
continue;
 }

valueCatStr(next, buff, len);
state=jsonElement;
continue;

casejsonNumber:
msg="Invalid Number character";

if (len==2&&buff[1] =='0'&&ch=='0')
 goto jsonErr;

switch (ch) {
case':':
case'{':
case'[':
 goto jsonErr;

case',':
case'}':
case']':
caseEOF:
*next=js_strtod(buff, len);
state=jsonEnd;
continue;

case'0':
case'1':
case'2':
case'3':
case'4':
case'5':
case'6':
case'7':
case'8':
case'9':
case'e':
case'E':
case'+':
case'-':
case'.':
if (len<sizeof(buff)) {
buff[len++] =ch;
continue;
 }
 }
default:
 goto jsonErr;
 }
	}

jsonErr:
fprintf(stderr, "Error: jsonparse => syntax error: %s pos: %d\n", msg, off);

next->bits=vt_status;
next->status=ERROR_json_parse;

vec_free(stack);
return*next;
}