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-rw-r--r--edify/expr.h61
1 files changed, 40 insertions, 21 deletions
diff --git a/edify/expr.h b/edify/expr.h
index cfbef903b..671b499b5 100644
--- a/edify/expr.h
+++ b/edify/expr.h
@@ -17,45 +17,64 @@
#ifndef _EXPRESSION_H
#define _EXPRESSION_H
+#include "yydefs.h"
+
#define MAX_STRING_LEN 1024
typedef struct Expr Expr;
-typedef char* (*Function)(const char* name, void* cookie,
+typedef struct {
+ // Optional pointer to app-specific data; the core of edify never
+ // uses this value.
+ void* cookie;
+
+ // The source of the original script. Must be NULL-terminated,
+ // and in writable memory (Evaluate may make temporary changes to
+ // it but will restore it when done).
+ char* script;
+
+ // The error message (if any) returned if the evaluation aborts.
+ // Should be NULL initially, will be either NULL or a malloc'd
+ // pointer after Evaluate() returns.
+ char* errmsg;
+} State;
+
+typedef char* (*Function)(const char* name, State* state,
int argc, Expr* argv[]);
struct Expr {
- Function fn;
- char* name;
- int argc;
- Expr** argv;
+ Function fn;
+ char* name;
+ int argc;
+ Expr** argv;
+ int start, end;
};
-char* Evaluate(void* cookie, Expr* expr);
+char* Evaluate(State* state, Expr* expr);
// Glue to make an Expr out of a literal.
-char* Literal(const char* name, void* cookie, int argc, Expr* argv[]);
+char* Literal(const char* name, State* state, int argc, Expr* argv[]);
// Functions corresponding to various syntactic sugar operators.
// ("concat" is also available as a builtin function, to concatenate
// more than two strings.)
-char* ConcatFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* LogicalAndFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* LogicalOrFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* LogicalNotFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* SubstringFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* EqualityFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* InequalityFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* SequenceFn(const char* name, void* cookie, int argc, Expr* argv[]);
+char* ConcatFn(const char* name, State* state, int argc, Expr* argv[]);
+char* LogicalAndFn(const char* name, State* state, int argc, Expr* argv[]);
+char* LogicalOrFn(const char* name, State* state, int argc, Expr* argv[]);
+char* LogicalNotFn(const char* name, State* state, int argc, Expr* argv[]);
+char* SubstringFn(const char* name, State* state, int argc, Expr* argv[]);
+char* EqualityFn(const char* name, State* state, int argc, Expr* argv[]);
+char* InequalityFn(const char* name, State* state, int argc, Expr* argv[]);
+char* SequenceFn(const char* name, State* state, int argc, Expr* argv[]);
// Convenience function for building expressions with a fixed number
// of arguments.
-Expr* Build(Function fn, int count, ...);
+Expr* Build(Function fn, YYLTYPE loc, int count, ...);
// Global builtins, registered by RegisterBuiltins().
-char* IfElseFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* AssertFn(const char* name, void* cookie, int argc, Expr* argv[]);
-char* AbortFn(const char* name, void* cookie, int argc, Expr* argv[]);
+char* IfElseFn(const char* name, State* state, int argc, Expr* argv[]);
+char* AssertFn(const char* name, State* state, int argc, Expr* argv[]);
+char* AbortFn(const char* name, State* state, int argc, Expr* argv[]);
// For setting and getting the global error string (when returning
@@ -91,13 +110,13 @@ Function FindFunction(const char* name);
// Evaluate the expressions in argv, giving 'count' char* (the ... is
// zero or more char** to put them in). If any expression evaluates
// to NULL, free the rest and return -1. Return 0 on success.
-int ReadArgs(void* cookie, Expr* argv[], int count, ...);
+int ReadArgs(State* state, Expr* argv[], int count, ...);
// Evaluate the expressions in argv, returning an array of char*
// results. If any evaluate to NULL, free the rest and return NULL.
// The caller is responsible for freeing the returned array and the
// strings it contains.
-char** ReadVarArgs(void* cookie, int argc, Expr* argv[]);
+char** ReadVarArgs(State* state, int argc, Expr* argv[]);
#endif // _EXPRESSION_H