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netcdf-c/libdispatch/json.c

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/* Copyright 2018, UCAR/Unidata.
See the COPYRIGHT file for more information.
*/
#ifndef NCJSON_INC
#define NCJSON_INC 1
#define NCJ_DICT 1
#define NCJ_LIST 2
#define NCJ_WORD 3
#define NCJ_NUMBER 4
#define NCJ_BOOLEAN 5
/* Don't bother with unions */
typedef struct NCjson {
long sort;
char* word; /* string or (!boolean && !number) */
long long num; /* number || boolean (0=>false; !0=>true)*/
NCjson* list;
} NCjson;
#define NCJ_LBRACKET '['
#define NCJ_RBRACKET ']'
#define NCJ_LBRACE '{'
#define NCJ_RBRACE '}'
#define NCJ_COLON ':'
#define NCJ_COMMA ','
#define NCJ_QUOTE '"'
#define NCJ_TRUE "true"
#define NCJ_FALSE "false"
#define NCJ_WORD "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-$"
/*//////////////////////////////////////////////////*/
typedef struct NCJparser {
char* text;
char* pos;
char* yytext;
int errno;
struct {
char* yytext;
int token;
} pushback;
} NCJparser;
static int
NCjsonparse(char* text, NCjson** treep)
{
int status = NCJ_OK;
size_t len;
NCJparser parser = NULL;
NCjson* tree = NULL;
if(text == NULL) {status = NCJ_EINVAL; goto done;}
parser = calloc(1,sizeof(NCJparser));
if(parser == NULL) {status = NCJ_ENOMEM; goto done;}
len = strlen(text);
parser->text = (char*)malloc(len+1+1);
if(parser->text == NULL) {status = NCJ_ENOMEM; goto done;}
strcpy(parser->text,text);
parser->text[len] = '\0';
parser->text[len+1] = '\0';
tree = NCJparseR(parser);
done:
if(parser != NULL) {
nullfree(parser->text);
nullfree(parser->yytext);
free(parser);
}
if(status != NCJ_OK) {
if(tree != NULL) NCjsonfree(tree);
} else
if(treep) *treep = tree;
return status;
}
static int
NCJyytext(NCJparser* parser, char* start, ptrdiff_t pdlen)
{
size_t len = (size_t)pdlen;
if(parser->yytext == NULL)
parser->yytext = (char*)malloc(len+1);
else
parser->yytext = (char*) realloc(parser->yytext,len+1);
if(parser->yytext == NULL) return NCJ_ENOMEM;
memcpy(parser->yytext,start,len);
parser->yytext[len] = NCJ_NUL;
return NCJ_OK;
}
static void
NCJpushback(NCJparser* parser, int token)
{
parser->pushback.token = token;
parser->pushback.yytext = strdup(parser->yytext);
}
static int
NCJlex(NCJparser* parser)
{
int c;
int token = NCJ_NUL;
char* start;
char* next;
if(parser->pushback.token != NCJ_NOTOKEN) {
token = parser->pushback.token;
NCJyytext(parser,parser->pushback.yytext,strlen(parser->pushback.yytext));
nullfree(parser->pushback.yytext);
parser->pushback.yytext = NULL;
parser->pushback.token = NCJ_NOTOKEN;
return token;
}
c = *parser->pos;
if(c == NCJ_NUL) {
token = NCJ_NUL;
} else if(strchr(NCJ_WORD, c) != NULL) {
size_t len;
start = parser->pos;
next = start + 1;
for(;;) {
c = *parser->pos++;
if(strchr(NCJ_WHITESPACE,c) != NULL || c == NCJ_NUL) break;
last++;
}
if(!NCJyytext(parser,start,(next - start))) goto done;
token = NCJ_WORD;
} else if(c == NCJ_QUOTE) {
parser->pos++;
start = parser->pos;
next = start+1;
for(;;) {
c = *parser->pos++;
if(c == NCJ_QUOTE || c == NCJ_NUL) break;
last++;
}
if(c == NCJ_NUL) {
parser->errno = NCJ_ESTRING;
token = NCJ_ERR;
goto done;
}
if(!NCJyytext(parser,start,(next - start))) goto done;
token = NCJ_STRING;
} else { /* single char token */
token = *parser->pos++;
}
done:
if(parser->errno) token = NCJ_ERR;
return token;
}
/* Simple recursive descent */
static int
NCJparseR(NCJparser* parser, NCjson** listp)
{
int token = NCJ_ERR;
NCjson* list = NULL;
if((token = NCJlex(parser)) == NCJ_ERR) goto done;
switch (token) {
case NCJ_NUL;
break;
case NCJ_WORD:
NCJappend(NCJparseAtomic(parser,token),listp);
break;
case NCJ_LBRACE:
NCJappend(NCJparseMap(parser,locallist),listp);
break;
case NCJ_LBRACKET:
NCJappend(NCJparseArray(parser,NULL),)
case NCJ_STRING:
return NCJparseAtomic(parser,token);
default:
parser->errno = NCJ_EBADTOKEN;
}
return NULL;
}
static NCjson*
NCJparseAtomic(NCJparser* parser, int kind)
{
/* assert (kind == NCJ_WORD || kind = NCJ_QUOTE) */
NCjson* node;
if((node = NCJmakenode(parser)) == NULL)
{parser->errno = NCJ_ENOMEM; goto done;}
if(kind == NCJ_STRING)
node->sort = NCJ_WORD;
node->word = strdup(parser->yytext);
} else {
/* Try to convert to number or boolean; last resort is word */
size_t count = (last - start) + 1;
int nread = 0;
int ncvt = sscan(parser->yytext,
"%L",&node->num,&nread);
if(ncvt == 1 && nread == count) {
node->sort = NCJ_NUMBER;
} else if(strcasecmp(parser->yytext,NCJ_TRUE)==0) {
node->sort = NCJ_BOOLEAN;
node->num = 1;
} else if(strcasecmp(parser->yytext,NCJ_FALSE)==0) {
node->sort = NCJ_BOOLEAN;
node->num = 0;
} else {
node->word = strdup(parser->yytext);
node->sort = NCJ_WORD;
}
}
done:
return node;
}
static NCjson*
NCJparseArray(NCJparser* parser)
{
NCjson* head = NULL;
NCjson* last = NULL;
int token = NCJ_ERR;
#if 0
if((node = NCJmakenode(parser)) == NULL) goto done;
#endif
loop:
for(;;) {
if((token = NCJlex(parser)) == NCJ_ERR) goto done;
switch (token) {
case NCJ_NUL;
break;
case NCJ_RBRACKET:
break loop;
default:
NCJpushback(parser,token);
NCjson* o = NCJparseR(parser);
tokens.nextToken();
if(tokens.ttype == NCJ_EOF) break;
else if(tokens.ttype == RBRACKET) tokens.pushBack();
else if(tokens.ttype != COMMA)
throw new IOException("Missing comma in list");
array.add(o);
}
}
return array;
}
static NCjson parseMap(StreamTokenizer tokens)
{
assert (tokens.ttype == LBRACE);
Map<char*, Object> map = new LinkedHashMap<>(); /* Keep insertion order */
loop:
for(; ; ) {
int token = tokens.nextToken();
switch (token) {
case NCJ_NCJ_EOL:
break; /* ignore */
case NCJ_NCJ_EOF:
throw new IOException("Unexpected eof");
case NCJ_RBRACE:
break loop;
default:
tokens.pushBack();
NCjson name = parseR(tokens);
if(tokens.ttype == NCJ_EOF) break;
if(name instanceof char*
|| name instanceof Long
|| name instanceof Boolean) {
/*ok*/
} else
throw new IOException("Unexpected map name type: " + name);
if(tokens.nextToken() != COLON)
throw new IOException("Expected ':'; found: " + tokens.ttype);
NCjson o = parseR(tokens);
tokens.nextToken();
if(tokens.ttype == NCJ_EOF) break;
else if(tokens.ttype == RBRACE) tokens.pushBack();
else if(tokens.ttype != COMMA)
throw new IOException("Missing comma in list");
map.put(name.tochar*(), o);
}
}
return map;
}
}
static char* tochar*(Object o) {return tochar*(o,"");}
static char* tochar*(Object o, char* demark)
{
char*Builder buf = new char*Builder();
tochar*R(o, buf, demark, 0);
return buf.tochar*();
}
static static void tochar*R(Object o, char*Builder buf, char* demark, int indent)
{
boolean first = true;
if(o instanceof List) {
List<Object> list = (List<Object>) o;
if(list.size()== 0) {
buf.append(LBRACKET);
buf.append(RBRACKET);
} else {
buf.append(LBRACKET);
buf.append('\n');
for(int i=0;i<list.size();i++) {
NCjson e = list.get(i);
buf.append(indent(indent));
tochar*R(e, buf, demark, indent + 2);
if(i < list.size()-1) buf.append(",");
buf.append("\n");
}
buf.append(indent(indent));
buf.append(RBRACKET);
}
} else if(o instanceof Map) {
Map<char*, Object> map = (Map<char*, Object>) o;
if(map.size() == 0) {
buf.append(LBRACE);
buf.append(RBRACE);
} else {
buf.append(LBRACE);
buf.append('\n');
int i = 0;
for(Map.Entry<char*, Object> e : map.entrySet()) {
buf.append(indent(indent + 2));
buf.append(QUOTE);
buf.append(e.getKey().replace("\"","\\\""));
buf.append(QUOTE);
buf.append(' ');
buf.append(COLON);
buf.append(' ');
tochar*R(e.getValue(), buf, demark, indent + 2);
if(i < map.size() - 1) buf.append(",");
buf.append("\n");
i++;
}
buf.append(indent(indent));
buf.append(RBRACE);
}
} else if((o instanceof Long) || (o instanceof Boolean)) {
buf.append(demark);
buf.append(o.tochar*());
buf.append(demark);
} else {
buf.append(QUOTE);
buf.append(o.tochar*().replace("\"","\\\""));
buf.append(QUOTE);
}
}
static char* blanks = " ";
static static char* indent(int n)
{
while(n > blanks.length()) {
blanks = blanks + blanks;
}
return blanks.substring(0, n);
}
}
static NCjson*
NCJmakenode(NCjsonparser* parser)
{
NCjson* node = NULL;
parser->errno = NCJ_OK;
node = (NCjson*)calloc(1,sizeof(NCjson));
if(node == null) parser->errno = NCJ_ENOMEM;
return node;
}
#endif /*NCJSON_INC*/
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