/*
* Exported JSON decoding interface
*/
JX9_PRIVATE int jx9JsonDecode(jx9_context *pCtx,const char *zJSON,int nByte)
{
jx9_vm *pVm = pCtx->pVm;
json_decoder sDecoder;
SySet sToken;
SyLex sLex;
sxi32 rc;
/* Tokenize the input */
SySetInit(&sToken, &pVm->sAllocator, sizeof(SyToken));
rc = SXRET_OK;
SyLexInit(&sLex, &sToken, VmJsonTokenize, &rc);
SyLexTokenizeInput(&sLex,zJSON,(sxu32)nByte, 0, 0, 0);
if( rc != SXRET_OK ){
/* Something goes wrong while tokenizing input. [i.e: Unexpected token] */
SyLexRelease(&sLex);
SySetRelease(&sToken);
/* return NULL */
jx9_result_null(pCtx);
return JX9_OK;
}
/* Fill the decoder */
sDecoder.pCtx = pCtx;
sDecoder.pErr = &rc;
sDecoder.pIn = (SyToken *)SySetBasePtr(&sToken);
sDecoder.pEnd = &sDecoder.pIn[SySetUsed(&sToken)];
sDecoder.iFlags = 0;
sDecoder.rec_count = 0;
/* Set a default consumer */
sDecoder.xConsumer = VmJsonDefaultDecoder;
sDecoder.pUserData = 0;
/* Decode the raw JSON input */
rc = VmJsonDecode(&sDecoder, 0);
if( rc == SXERR_ABORT ){
/*
* Something goes wrong while decoding JSON input.Return NULL.
*/
jx9_result_null(pCtx);
}
/* Clean-up the mess left behind */
SyLexRelease(&sLex);
SySetRelease(&sToken);
/* All done */
return JX9_OK;
}
/*
* Extract a single expression node from the input.
* On success store the freshly extractd node in ppNode.
* When errors, JX9 take care of generating the appropriate error message.
* An expression node can be a variable [i.e: $var], an operator [i.e: ++]
* an annonymous function [i.e: function(){ return "Hello"; }, a double/single
* quoted string, a heredoc/nowdoc, a literal [i.e: JX9_EOL], a namespace path
* [i.e: namespaces\path\to..], a array/list [i.e: array(4, 5, 6)] and so on.
*/
static sxi32 ExprExtractNode(jx9_gen_state *pGen, jx9_expr_node **ppNode)
{
jx9_expr_node *pNode;
SyToken *pCur;
sxi32 rc;
/* Allocate a new node */
pNode = (jx9_expr_node *)SyMemBackendPoolAlloc(&pGen->pVm->sAllocator, sizeof(jx9_expr_node));
if( pNode == 0 ){
/* If the supplied memory subsystem is so sick that we are unable to allocate
* a tiny chunk of memory, there is no much we can do here.
*/
return SXERR_MEM;
}
/* Zero the structure */
SyZero(pNode, sizeof(jx9_expr_node));
SySetInit(&pNode->aNodeArgs, &pGen->pVm->sAllocator, sizeof(jx9_expr_node **));
/* Point to the head of the token stream */
pCur = pNode->pStart = pGen->pIn;
/* Start collecting tokens */
if( pCur->nType & JX9_TK_OP ){
/* Point to the instance that describe this operator */
pNode->pOp = (const jx9_expr_op *)pCur->pUserData;
/* Advance the stream cursor */
pCur++;
}else if( pCur->nType & JX9_TK_DOLLAR ){
/* Isolate variable */
pCur++; /* Jump the dollar sign */
if( pCur >= pGen->pEnd ){
/* Syntax error */
rc = jx9GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,"Invalid variable name");
if( rc != SXERR_ABORT ){
rc = SXERR_SYNTAX;
}
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
pCur++; /* Jump the variable name */
pNode->xCode = jx9CompileVariable;
}else if( pCur->nType & JX9_TK_OCB /* '{' */ ){
/* JSON Object, assemble tokens */
pCur++;
jx9DelimitNestedTokens(pCur, pGen->pEnd, JX9_TK_OCB /* '[' */, JX9_TK_CCB /* ']' */, &pCur);
if( pCur < pGen->pEnd ){
pCur++;
}else{
/* Syntax error */
rc = jx9GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,"JSON Object: Missing closing braces '}'");
if( rc != SXERR_ABORT ){
rc = SXERR_SYNTAX;
}
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
pNode->xCode = jx9CompileJsonObject;
}else if( pCur->nType & JX9_TK_OSB /* '[' */ && !(pCur->nType & JX9_TK_OP) ){
/* JSON Array, assemble tokens */
pCur++;
jx9DelimitNestedTokens(pCur, pGen->pEnd, JX9_TK_OSB /* '[' */, JX9_TK_CSB /* ']' */, &pCur);
if( pCur < pGen->pEnd ){
pCur++;
}else{
/* Syntax error */
rc = jx9GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,"JSON Array: Missing closing square bracket ']'");
if( rc != SXERR_ABORT ){
rc = SXERR_SYNTAX;
}
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
pNode->xCode = jx9CompileJsonArray;
}else if( pCur->nType & JX9_TK_KEYWORD ){
int nKeyword = SX_PTR_TO_INT(pCur->pUserData);
if( nKeyword == JX9_TKWRD_FUNCTION ){
/* Annonymous function */
if( &pCur[1] >= pGen->pEnd ){
/* Assume a literal */
pCur++;
pNode->xCode = jx9CompileLiteral;
}else{
/* Assemble annonymous functions body */
rc = ExprAssembleAnnon(&(*pGen), &pCur, pGen->pEnd);
if( rc != SXRET_OK ){
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
pNode->xCode = jx9CompileAnnonFunc;
}
}else if( jx9IsLangConstruct(nKeyword) && &pCur[1] < pGen->pEnd ){
/* Language constructs [i.e: print,die...] require special handling */
jx9DelimitNestedTokens(pCur, pGen->pEnd, JX9_TK_LPAREN|JX9_TK_OCB|JX9_TK_OSB, JX9_TK_RPAREN|JX9_TK_CCB|JX9_TK_CSB, &pCur);
pNode->xCode = jx9CompileLangConstruct;
}else{
/* Assume a literal */
pCur++;
pNode->xCode = jx9CompileLiteral;
}
}else if( pCur->nType & (JX9_TK_ID) ){
/* Constants, function name, namespace path, object name... */
pCur++;
pNode->xCode = jx9CompileLiteral;
}else{
if( (pCur->nType & (JX9_TK_LPAREN|JX9_TK_RPAREN|JX9_TK_COMMA|JX9_TK_CSB|JX9_TK_OCB|JX9_TK_CCB|JX9_TK_COLON)) == 0 ){
/* Point to the code generator routine */
pNode->xCode = jx9GetNodeHandler(pCur->nType);
if( pNode->xCode == 0 ){
rc = jx9GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Syntax error: Unexpected token '%z'", &pNode->pStart->sData);
if( rc != SXERR_ABORT ){
rc = SXERR_SYNTAX;
}
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
}
/* Advance the stream cursor */
pCur++;
}
/* Point to the end of the token stream */
pNode->pEnd = pCur;
/* Save the node for later processing */
*ppNode = pNode;
/* Synchronize cursors */
pGen->pIn = pCur;
return SXRET_OK;
}
