esp.c

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/******************************************************************************/
/*
 *	Get the next ESP input token. input points to the next input token.
 *	parse->token will hold the parsed token. The function returns the token id.
 */

static int getEspToken(int state, EspParse *parse)
{
	char	*cp;
	int		tid, done, c, quoted;

	tid = ESP_TOK_LITERAL;
	parse->tokp = parse->token;
	parse->tokp[0] = '\0';
	quoted = 0;

	c = *parse->inp++;
	for (done = 0; !done; c = *parse->inp++) {

		/*
		 *	Get room for more characters in the token buffer
		 */
		if (parse->tokp >= parse->endp) {
			parse->token = (char*) mprRealloc(parse->token, 
				parse->tokLen + ESP_TOK_INCR);
			if (parse->token == 0) {
				return ESP_TOK_ERR;
			}
			parse->token[parse->tokLen] = '\0';
			parse->tokp = &parse->token[parse->tokLen - 1];
			parse->tokLen += ESP_TOK_INCR;
			parse->endp = &parse->token[parse->tokLen - 1];
		}

		switch (c) {
		case 0:
			if (*parse->token) {
				done++;
				parse->inp--;
				break;
			}
			return ESP_TOK_EOF;

		default:
			if (c == '\"' && state != ESP_STATE_IN_ESP_TAG) {
				*parse->tokp++ = '\\';
			}
			*parse->tokp++ = c;
			quoted = 0;
			break;

		case '\\':
			quoted = 1;
			*parse->tokp++ = c;
			break;

		case '@':
			if (*parse->inp == '@' && state != ESP_STATE_IN_ESP_TAG) {
				if (quoted) {
					parse->tokp--;
					quoted = 0;
				} else {
					if (*parse->token) {
						parse->inp--;
					} else {
						parse->inp++;
						tid = ESP_TOK_ATAT;
						if (getIdentifier(parse) < 0) {
							return ESP_TOK_ERR;
						}
					}
					done++;
					break;
				}
			}
			*parse->tokp++ = c;
			break;

		case '<':
			if (*parse->inp == '%' && state != ESP_STATE_IN_ESP_TAG) {
				if (quoted) {
					parse->tokp--;
					quoted = 0;
					*parse->tokp++ = c;
					break;
				}
				if (*parse->token) {
					parse->inp--;
					done++;
					break;
				}
				parse->inp++;
				while (isspace((int) *parse->inp)) {
					parse->inp++;
				}
				if (*parse->inp == '=') {
					parse->inp++;
					while (isspace((int) *parse->inp)) {
						parse->inp++;
					}
					tid = ESP_TOK_EQUALS;
					if (getIdentifier(parse) < 0) {
						return ESP_TOK_ERR;
					}
					done++;
					break;
				}
				if (*parse->inp == 'i' && 
						strncmp(parse->inp, "include", 7) == 0 &&
						isspace((int) parse->inp[7])) {
					tid = ESP_TOK_INCLUDE;
					parse->inp += 7;
					while (isspace((int) *parse->inp)) {
						parse->inp++;
					}
					while (*parse->inp && !isspace((int) *parse->inp) && 
							*parse->inp != '%' && parse->tokp < parse->endp) {
						*parse->tokp++ = *parse->inp++;
					}
					*parse->tokp = '\0';
					if (parse->token[0] == '"') {
						parse->tokp = parse->token;
						for (cp = &parse->token[1]; *cp; ) {
							*parse->tokp++ = *cp++;
						}
						if (cp[-1] == '"') {
							parse->tokp--;
						}
						*parse->tokp = '\0';
					}
					
				} else {
					tid = ESP_TOK_START_ESP;
				}
				done++;
				break;
			}
			*parse->tokp++ = c;
			break;

		case '%':
			if (*parse->inp == '>' && state == ESP_STATE_IN_ESP_TAG) {
				if (quoted) {
					parse->tokp--;
					quoted = 0;
				} else {
					if (*parse->token) {
						parse->inp--;
					} else {
						tid = ESP_TOK_END_ESP;
						parse->inp++;
					}
					done++;
					break;
				}
			}
			*parse->tokp++ = c;
			break;
		}
	}

	*parse->tokp = '\0';
	parse->inp--;
	return tid;
}

/******************************************************************************/
/*
 *	Convert an ESP page into a JavaScript. We also expand include files.
 */

static int buildScript(EspRequest *ep, char **jsBuf, char *input, char **errMsg)
{
	EspParse	parse;
	char		path[MPR_MAX_FNAME], dir[MPR_MAX_FNAME], incPath[MPR_MAX_FNAME];
	char		*incBuf, *incText;
	int			state, tid, len, rc, maxScriptSize, incSize;

	mprAssert(ep);
	mprAssert(jsBuf);
	mprAssert(input);

	rc = 0;
	len = 0;
	state = ESP_STATE_BEGIN;
	if (errMsg) {
		*errMsg = 0;
	}

	memset(&parse, 0, sizeof(parse));
	parse.token = (char*) mprMalloc(ESP_TOK_INCR);
	if (parse.token == 0) {
		return MPR_ERR_CANT_ALLOCATE;
	}
	parse.token[0] = '\0';
	parse.tokLen = ESP_TOK_INCR;
	parse.endp = &parse.token[parse.tokLen - 1];
	parse.tokp = parse.token;
	parse.inBuf = input;
	parse.inp = parse.inBuf;

	maxScriptSize = esp->maxScriptSize;

	tid = getEspToken(state, &parse);
	while (tid != ESP_TOK_EOF && len >= 0) {

		switch (tid) {
		default:
		case ESP_TOK_ERR:
			mprFree(parse.token);
			return MPR_ERR_BAD_SYNTAX;
			
		case ESP_TOK_LITERAL:
			len = mprReallocStrcat(jsBuf, maxScriptSize, len, 0, 
				"write(\"", parse.token, "\");\n", NULL);
			break;

		case ESP_TOK_ATAT:
			/*
			 *	Trick to get undefined variables to evaluate to "".
			 *	Catenate with "" to cause toString to run. 
			 */
			len = mprReallocStrcat(jsBuf, maxScriptSize, len, 0, 
				"write(\"\" + ", parse.token, ");\n", NULL);
			break;

		case ESP_TOK_EQUALS:
			len = mprReallocStrcat(jsBuf, maxScriptSize, len, 0, 
				"write(\"\" + ", parse.token, ");\n", NULL);
			state = ESP_STATE_IN_ESP_TAG;
			break;

		case ESP_TOK_START_ESP:
			state = ESP_STATE_IN_ESP_TAG;
			tid = getEspToken(state, &parse);
			while (tid != ESP_TOK_EOF && tid != ESP_TOK_EOF && 
					tid != ESP_TOK_END_ESP && len >= 0) {
				len = mprReallocStrcat(jsBuf, maxScriptSize, len, 0, 
					parse.token, NULL);
				tid = getEspToken(state, &parse);
			}
			state = ESP_STATE_BEGIN;
			break;

		case ESP_TOK_END_ESP:
			state = ESP_STATE_BEGIN;
			break;

		case ESP_TOK_INCLUDE:
			if (parse.token[0] == '/') {
				mprStrcpy(incPath, sizeof(incPath), parse.token);
			} else {
				mprGetDirName(dir, sizeof(dir), ep->uri);
				mprSprintf(incPath, sizeof(incPath), "%s/%s", 
					dir, parse.token);
			}
			if (esp->mapToStorage(ep->requestHandle, path, sizeof(path),
					incPath, 0) < 0) {
				mprAllocSprintf(errMsg, MPR_MAX_STRING, 
					"Can't find include file: %s", path);
				rc = MPR_ERR_CANT_OPEN;
				break;
			}
			if (esp->readFile(ep->requestHandle, &incText, &incSize, path) < 0){
				mprAllocSprintf(errMsg, MPR_MAX_STRING, 
					"Can't read include file: %s", path);
				rc = MPR_ERR_CANT_READ;
				break;
			}
			incText[incSize] = '\0';

			/*
			 *	Recurse and process the include script
			 */
			incBuf = 0;
			if ((rc = buildScript(ep, &incBuf, incText, errMsg)) < 0) {
				mprFree(incText);
				mprFree(parse.token);
				return rc;
			}

			len = mprReallocStrcat(jsBuf, maxScriptSize, len, 0, incBuf, NULL);
			mprFree(incText);
			mprFree(incBuf);
			state = ESP_STATE_IN_ESP_TAG;
			break;
		}
		tid = getEspToken(state, &parse);
	}
	mprFree(parse.token);
	if (len < 0) {
		mprAllocSprintf(errMsg, MPR_MAX_STRING, 
			"Script token is too big in %s.\nConfigured maximum is %d.", 
			path, maxScriptSize);
		return MPR_ERR_WONT_FIT;
	}
	return rc;
}

/******************************************************************************/
/******************************* Wrapped Routines *****************************/
/******************************************************************************/

int espCopyVar(EspRequest *ep, char *var, MprVar *value, int copyDepth)
{
	return ejsCopyVar(ep->eid, var, value, copyDepth);
}

/******************************************************************************/

MprVar espCreateObjVar(char *name, int hashSize)
{
	return ejsCreateObj(name, hashSize);
}

/******************************************************************************/

MprVar espCreateArrayVar(char *name, int size)
{
	return ejsCreateArray(name, size);
}

/******************************************************************************/

bool espDestroyVar(MprVar *obj)
{
	return ejsDestroyVar(obj);
}

/******************************************************************************/

MprVar *espCreateProperty(MprVar *obj, char *property, MprVar *newValue)
{
	return mprCreateProperty(obj, property, newValue);
}

/******************************************************************************/

MprVar *espCreatePropertyValue(MprVar *obj, char *property, MprVar newValue)
{
	return mprCreatePropertyValue(obj, property, newValue);
}

/******************************************************************************/

void espDefineFunction(EspRequest *ep, const char *functionName, char *args, char *body)
{
	ejsDefineFunction(ep->eid, functionName, args, body);
}

/******************************************************************************/

int espDeleteProperty(MprVar *obj, char *property)
{
	return mprDeleteProperty(obj, property);
}

/******************************************************************************/

int espDeleteVar(EspRequest *ep, char *var)
{
	return ejsDeleteVar(ep->eid, var);
}

/******************************************************************************/
int espEvalFile(EspRequest *ep, char *path, MprVar *result, char **emsg)
{
	return ejsEvalFile(ep->eid, path, result, emsg);
}

/******************************************************************************/

int espEvalScript(EspRequest *ep, char *script, MprVar *result, char **emsg)
{
	return ejsEvalScript(ep->eid, script, result, emsg);
}

/******************************************************************************/

int espGetPropertyCount(MprVar *obj, int includeFlags)
{
	if (obj->type != MPR_TYPE_OBJECT) {
		return MPR_ERR_BAD_STATE;
	}
	return mprGetPropertyCount(obj, includeFlags);
}

/******************************************************************************/

MprVar *espGetFirstProperty(MprVar *obj, int includeFlags)
{
	return mprGetFirstProperty(obj, includeFlags);
}

/******************************************************************************/

MprVar *espGetGlobalObject(EspRequest *ep)
{
	return ejsGetGlobalObject(ep->eid);
}

/******************************************************************************/

MprVar *espGetLocalObject(EspRequest *ep)
{
	return ejsGetLocalObject(ep->eid);
}

/******************************************************************************/

MprVar *espGetNextProperty(MprVar *obj, MprVar *currentProperty, 
	int includeFlags)
{
	return mprGetNextProperty(obj, currentProperty, includeFlags);
}

/******************************************************************************/

MprVar *espGetProperty(MprVar *obj, char *property, MprVar *value)
{
	return mprGetProperty(obj, property, value);
}

/******************************************************************************/

void *espGetThisPtr(EspRequest *ep)
{
	return ejsGetThisPtr(ep->eid);
}

/******************************************************************************/
#if XX_UNUSED_XX
 
int espReadProperty(MprVar *dest, MprVar *prop)
{
	mprAssert(prop);
	mprAssert(dest);

	*dest = *prop;
	return 0;
}

#endif
/******************************************************************************/

int espReadVar(EspRequest *ep, char *var, MprVar *value)
{
	return ejsReadVar(ep->eid, var, value);
}

/******************************************************************************/

int espRunFunction(EspRequest *ep, MprVar *obj, char *functionName, 
	MprArray *args)
{
	return ejsRunFunction(ep->eid, obj, functionName, args);
}

/******************************************************************************/

MprVar *espSetProperty(MprVar *obj, char *property, MprVar *newValue)
{
	return mprSetProperty(obj, property, newValue);
}

/******************************************************************************/

MprVar *espSetPropertyValue(MprVar *obj, char *property, MprVar newValue)
{
	return mprSetPropertyValue(obj, property, newValue);
}

/******************************************************************************/

int espWriteVar(EspRequest *ep, char *var, MprVar *value)
{
	return ejsWriteVar(ep->eid, var, value);
}

/******************************************************************************/

int espWriteVarValue(EspRequest *ep, char *var, MprVar value)
{
	return ejsWriteVarValue(ep->eid, var, value);
}

/******************************************************************************/
#if XX_UNUSED_XX

int espWriteProperty(MprVar *prop, MprVar *newValue)
{
	return mprWriteProperty(prop, newValue);
}

/******************************************************************************/

int espWritePropertyValue(MprVar *prop, MprVar newValue)
{
	return mprWritePropertyValue(prop, newValue);
}

#endif
/******************************************************************************/

#else	/* !BLD_FEATURE_ESP_MODULE */
void espDummy() {}

/******************************************************************************/
#endif /* BLD_FEATURE_ESP_MODULE */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim:tw=78
 * vim600: sw=4 ts=4 fdm=marker
 * vim<600: sw=4 ts=4
 */