From: Alexei Sheplyakov <varg@theor.jinr.ru>
Date: Sat, 13 Sep 2008 00:40:12 +0000 (+0400)
Subject: parser: allow read/write access to symbol table and strictness.
X-Git-Tag: release_1-5-0~59^2~11
X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=commitdiff_plain;h=ef06261c6354bea6d35e8bcdb89806056d4cccb9

parser: allow read/write access to symbol table and strictness.

Intended usage:

parser reader;
ifstream input_file1, input_file2;
// read the first file...
ex e1 = reader(input_file1);
// ... add extra entry into the symbol table used by parser
symbol x;
parser.get_syms()["x"] = x;
// Disable the parser to introduce new symbols, e.g. to ensure the expression
// in input_file2 contains the same symbols as e1 (read from input_file1).
parser.strict = true;
ex e2;
try {
	e2 = reader(input_file2);
} catch (...) {
	abort();
}
---

diff --git a/ginac/parser/parser.hpp b/ginac/parser/parser.hpp
index a87bcae0..dbe60ee0 100644
--- a/ginac/parser/parser.hpp
+++ b/ginac/parser/parser.hpp
@@ -76,10 +76,15 @@ public:
 	{ 
 		return syms; 
 	}
+	/// read/write access to the symbol table
+	symtab& get_syms()
+	{
+		return syms;
+	}
 
-private:
 	/// If true, throw an exception if an unknown symbol is encountered.
-	const bool strict;
+	bool strict;
+private:
 	/**
 	 * Function/ctor table, maps a prototype (which is a name and number
 	 * arguments) to a C++ function. Used for parsing identifier_expr's