1 files changed, 115 insertions, 0 deletions
diff --git a/e-util/e-sexp.h b/e-util/e-sexp.h
new file mode 100644
index 0000000000..a41fdb0b58
--- /dev/null
+++ b/e-util/e-sexp.h
@@ -0,0 +1,115 @@
+/*
+  generic s-exp evaluator class
+*/
+#ifndef _E_SEXP_H
+#define _E_SEXP_H
+
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#define E_SEXP(obj)         GTK_CHECK_CAST (obj, e_sexp_get_type (), ESExp)
+#define E_SEXP_CLASS(klass) GTK_CHECK_CLASS_CAST (klass, e_sexp_get_type (), ESExpClass)
+#define FILTER_IS_SEXP(obj)      GTK_CHECK_TYPE (obj, e_sexp_get_type ())
+
+typedef struct _ESExp      ESExp;
+typedef struct _ESExpClass ESExpClass;
+
+typedef struct _ESExpSymbol ESExpSymbol;
+typedef struct _ESExpResult ESExpResult;
+typedef struct _ESExpTerm ESExpTerm;
+
+typedef struct _ESExpResult *(ESExpFunc)(struct _ESExp *sexp,
+						   int argc,
+						   struct _ESExpResult **argv,
+						   void *data);
+
+typedef struct _ESExpResult *(ESExpIFunc)(struct _ESExp *sexp,
+						    int argc,
+						    struct _ESExpTerm **argv,
+						    void *data);
+enum _ESExpResultType {
+	ESEXP_RES_ARRAY_PTR=0,	/* type is a ptrarray, what it points to is implementation dependant */
+	ESEXP_RES_INT,		/* type is a number */
+	ESEXP_RES_STRING,	/* type is a pointer to a single string */
+	ESEXP_RES_BOOL,		/* boolean type */
+	ESEXP_RES_UNDEFINED	/* unknown type */
+};
+
+struct _ESExpResult {
+	enum _ESExpResultType type;
+	union {
+		GPtrArray *ptrarray;
+		int number;
+		char *string;
+		int bool;
+	} value;
+};
+
+enum _ESExpTermType {
+	ESEXP_TERM_INT	= 0,	/* integer literal */
+	ESEXP_TERM_BOOL,	/* boolean literal */
+	ESEXP_TERM_STRING,	/* string literal */
+	ESEXP_TERM_FUNC,	/* normal function, arguments are evaluated before calling */
+	ESEXP_TERM_IFUNC,	/* immediate function, raw terms are arguments */
+	ESEXP_TERM_VAR,		/* variable reference */
+};
+
+struct _ESExpSymbol {
+	int type;		/* ESEXP_TERM_FUNC or ESEXP_TERM_VAR */
+	char *name;
+	void *data;
+	union {
+		ESExpFunc *func;
+		ESExpIFunc *ifunc;
+	} f;
+};
+
+struct _ESExpTerm {
+	enum _ESExpTermType type;
+	union {
+		char *string;
+		int number;
+		int bool;
+		struct {
+			struct _ESExpSymbol *sym;
+			struct _ESExpTerm **terms;
+			int termcount;
+		} func;
+		struct _ESExpSymbol *var;
+	} value;
+};
+
+
+
+struct _ESExp {
+	GtkObject object;
+
+	GScanner *scanner;	/* for parsing text version */
+	ESExpTerm *tree;	/* root of expression tree */
+};
+
+struct _ESExpClass {
+	GtkObjectClass parent_class;
+
+};
+
+guint		e_sexp_get_type		(void);
+ESExp     *e_sexp_new			(void);
+void		e_sexp_add_function  	(ESExp *f, int scope, char *name, ESExpFunc *func, void *data);
+void		e_sexp_add_ifunction  	(ESExp *f, int scope, char *name, ESExpIFunc *func, void *data);
+void		e_sexp_add_variable  	(ESExp *f, int scope, char *name, ESExpTerm *value);
+void		e_sexp_remove_symbol	(ESExp *f, int scope, char *name);
+int		e_sexp_set_scope		(ESExp *f, int scope);
+
+void		e_sexp_input_text		(ESExp *f, char *text, int len);
+void		e_sexp_input_file		(ESExp *f, int fd);
+
+
+void		e_sexp_parse		(ESExp *f);
+ESExpResult *e_sexp_eval		(ESExp *f);
+
+ESExpResult *e_sexp_term_eval		(struct _ESExp *f, struct _ESExpTerm *t);
+ESExpResult *e_sexp_result_new	(int type);
+void		e_sexp_result_free		(struct _ESExpResult *t);
+
+#endif /* _E_SEXP_H */