* Interface to parser context. */
/*
- * GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2015 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
typedef std::map<std::string, ex> symtab;
/**
- * Find the symbol with the @a name in the symbol table @a syms.
+ * Find the symbol (or abbreviation) with the @a name in the symbol table @a syms.
*
* If symbol is missing and @a strict = false, insert it, otherwise
* throw an exception.
*/
-extern symbol
+extern ex
find_or_insert_symbol(const std::string& name, symtab& syms,
const bool strict);
* foo(x+y, z^2, t)), it looks up such a table to find out which
* function (or class) corresponds to the given name and has the given
* number of the arguments.
+ *
+ * N.B.
+ *
+ * 1. The function don't have to return a (GiNaC) function or class, it
+ * can return any expression.
+ * 2. Overloaded functions/ctors are paritally supported, i.e. there might
+ * be several functions with the same name, but they should take different
+ * number of arguments.
+ * 3. User can extend the parser via custom prototype tables. It's possible
+ * to read user defined classes, create abbreviations, etc.
+ *
+ * NOTE: due to a hack that allows user defined functions to be parsed, the map
+ * value of type reader_func is internally treated as an unsigned and not as a
+ * function pointer!! The unsigned has to correspond to the serial number of
+ * the defined GiNaC function.
*/
-typedef std::map<prototype, unsigned> prototype_table;
+class PrototypeLess
+{
+public:
+ bool operator()(const prototype& p1, const prototype& p2) const
+ {
+ int s = p1.first.compare(p2.first);
+ if (s == 0) {
+ if ((p1.second == 0) || (p2.second == 0)) return false;
+ return p1.second < p2.second;
+ }
+ return s < 0;
+ }
+};
+typedef std::map<prototype, reader_func, PrototypeLess> prototype_table;
/**
- * Creates a default prototype table containing all defined GiNaC functions.
+ * Default prototype table.
+ *
+ * It supports all defined GiNaC functions and "pow", "sqrt", and "power".
+ */
+extern const prototype_table& get_default_reader();
+/**
+ * Builtin prototype table.
*
- * The data referenced by the return value is only created once when this
- * function is called for the first time. This might cause problems in very
- * rare stituations (i.e. if functions are added after this first call). In
- * that case, a new initialization can be forced with an "true" argument.
+ * It supports only the builtin GiNaC functions and "pow", "sqrt", and "power".
*/
-extern const prototype_table& get_default_reader(bool force_init = false);
+extern const prototype_table& get_builtin_reader();
} // namespace GiNaC