81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _EXPRESSION_H
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#define _EXPRESSION_H
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#define MAX_STRING_LEN 1024
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typedef struct Expr Expr;
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typedef char* (*Function)(const char* name, void* cookie,
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int argc, Expr* argv[]);
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struct Expr {
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Function fn;
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char* name;
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int argc;
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Expr** argv;
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};
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char* Evaluate(void* cookie, Expr* expr);
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// Glue to make an Expr out of a literal.
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char* Literal(const char* name, void* cookie, int argc, Expr* argv[]);
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// Functions corresponding to various syntactic sugar operators.
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// ("concat" is also available as a builtin function, to concatenate
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// more than two strings.)
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char* ConcatFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* LogicalAndFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* LogicalOrFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* LogicalNotFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* SubstringFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* EqualityFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* InequalityFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* SequenceFn(const char* name, void* cookie, int argc, Expr* argv[]);
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// Convenience function for building expressions with a fixed number
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// of arguments.
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Expr* Build(Function fn, int count, ...);
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// Global builtins, registered by RegisterBuiltins().
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char* IfElseFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* AssertFn(const char* name, void* cookie, int argc, Expr* argv[]);
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char* AbortFn(const char* name, void* cookie, int argc, Expr* argv[]);
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typedef struct {
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const char* name;
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Function fn;
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} NamedFunction;
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// Register a new function. The same Function may be registered under
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// multiple names, but a given name should only be used once.
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void RegisterFunction(const char* name, Function fn);
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// Register all the builtins.
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void RegisterBuiltins();
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// Call this after all calls to RegisterFunction() but before parsing
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// any scripts to finish building the function table.
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void FinishRegistration();
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// Find the Function for a given name; return NULL if no such function
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// exists.
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Function FindFunction(const char* name);
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#endif // _EXPRESSION_H
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