add some logic tools

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6189 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_expr/expreval.h

@@ -0,0 +1,127 @@
+/*
+    File: expreval.h
+    Auth: Brian Allen Vanderburg II
+    Date: Thursday, April 24, 2003
+    Desc: Main include file for ExprEval library
+
+    This file is part of ExprEval.
+*/
+
+
+/* Include once */
+#ifndef __BAVII_EXPREVAL_H
+#define __BAVII_EXPREVAL_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Define type of data to use */
+typedef double EXPRTYPE;
+
+/* Defines for various things */
+
+/* Max id size */
+#define EXPR_MAXIDENTSIZE 255
+
+/* Error values */
+enum
+    {
+    EXPR_ERROR_UNKNOWN = -1, /* Unknown error */
+    EXPR_ERROR_NOERROR = 0, /* No Error */
+    EXPR_ERROR_MEMORY, /* Memory allocation failed */
+    EXPR_ERROR_NULLPOINTER, /* Null pointer passed to function */
+    EXPR_ERROR_NOTFOUND, /* Item not found in a list */
+    EXPR_ERROR_UNMATCHEDCOMMENT, /* Unmatched comment tags */
+    EXPR_ERROR_INVALIDCHAR, /* Invalid characters in expression */
+    EXPR_ERROR_ALREADYEXISTS, /* An item already called create */
+    EXPR_ERROR_ALREADYPARSEDBAD, /* Expression parsed already, but unsuccessfully. call free or clear */
+    EXPR_ERROR_ALREADYPARSEDGOOD, /* Expression parsed already, successfully, call free or clear */
+    EXPR_ERROR_EMPTYEXPR, /* Empty expression string passed to parse */
+    EXPR_ERROR_UNMATCHEDPAREN, /* Unmatched parenthesis */
+    EXPR_ERROR_SYNTAX, /* Syntax error in expression */
+    EXPR_ERROR_MISSINGSEMICOLON, /* Missing semicolon at end of expression */
+    EXPR_ERROR_BADIDENTIFIER, /* Identifier was to big or not formed right */
+    EXPR_ERROR_NOSUCHFUNCTION, /* Function does not exist in function list */
+    EXPR_ERROR_BADNUMBERARGUMENTS, /* Bad number of arguments in a function call */
+    EXPR_ERROR_BADEXPR, /* This is a bad expression to evaluate. It has not been parsed or has unsuccessfully */
+    EXPR_ERROR_UNABLETOASSIGN, /* Unable to do an assignment, maybe no variable list */
+    EXPR_ERROR_DIVBYZERO, /* Attempted a division by zero */
+    EXPR_ERROR_NOVARLIST, /* No variable list found but one is needed */
+    EXPR_ERROR_BREAK, /* Expression was broken by break function */
+    EXPR_ERROR_CONSTANTASSIGN, /* Assignment to a constant */
+    EXPR_ERROR_REFCONSTANT, /* Constant used as a reference parameter */
+    EXPR_ERROR_OUTOFRANGE, /* A bad value was passed to a function */
+
+    EXPR_ERROR_USER /* Custom errors should be larger than this */
+    };
+
+/* Macros */
+
+/* Forward declarations */
+typedef struct _exprNode exprNode;
+typedef struct _exprFuncList exprFuncList;
+typedef struct _exprValList exprValList;
+typedef struct _exprObj exprObj;
+
+/* Function types */
+typedef int (*exprFuncType)(exprObj *obj, exprNode *nodes, int nodecount, EXPRTYPE **refs, int refcount, EXPRTYPE *val);
+typedef int (*exprBreakFuncType)(exprObj *obj);
+
+
+
+/* Functions */
+
+/* Version information function */
+void exprGetVersion(int *major, int *minor);
+
+/* Functions for function lists */
+int exprFuncListCreate(exprFuncList **flist);
+int exprFuncListAdd(exprFuncList *flist, char *name, exprFuncType ptr, int min, int max, int refmin, int refmax);
+int exprFuncListFree(exprFuncList *flist);
+int exprFuncListClear(exprFuncList *flist);
+int exprFuncListInit(exprFuncList *flist);
+
+/* Functions for value lists */
+int exprValListCreate(exprValList **vlist);
+int exprValListAdd(exprValList *vlist, char *name, EXPRTYPE val);
+int exprValListSet(exprValList *vlist, char *name, EXPRTYPE val);
+int exprValListGet(exprValList *vlist, char *name, EXPRTYPE *val);
+int exprValListAddAddress(exprValList *vlist, char *name, EXPRTYPE *addr);
+int exprValListGetAddress(exprValList *vlist, char *name, EXPRTYPE **addr);
+void *exprValListGetNext(exprValList *vlist, char **name, EXPRTYPE *value, EXPRTYPE** addr, void *cookie);
+int exprValListFree(exprValList *vlist);
+int exprValListClear(exprValList *vlist);
+int exprValListInit(exprValList *vlist);
+
+/* Functions for expression objects */
+int exprCreate(exprObj **obj, exprFuncList *flist, exprValList *vlist, exprValList *clist,
+    exprBreakFuncType breaker, void *userdata);
+int exprFree(exprObj *obj);
+int exprClear(exprObj *obj);
+int exprParse(exprObj *obj, char *expr);
+int exprEval(exprObj *obj, EXPRTYPE *val);
+int exprEvalNode(exprObj *obj, exprNode *nodes, int curnode, EXPRTYPE *val);
+exprFuncList *exprGetFuncList(exprObj *obj);
+exprValList *exprGetVarList(exprObj *obj);
+exprValList *exprGetConstList(exprObj *obj);
+exprBreakFuncType exprGetBreakFunc(exprObj *obj);
+int exprGetBreakResult(exprObj *obj);
+void* exprGetUserData(exprObj *obj);
+void exprSetUserData(exprObj *obj, void *userdata);
+void exprSetBreakCount(exprObj *obj, int count);
+void exprGetErrorPosition(exprObj *obj, int *start, int *end);
+
+/* Other useful routines */
+int exprValidIdent(char *name);
+
+/* Name mangling */
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif /* __BAVII_EXPREVAL_H */