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diff --git a/Build/source/utils/asymptote/parser.h b/Build/source/utils/asymptote/parser.h
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+/*****
+ * parser.h
+ * Tom Prince 2004/01/10
+ *
+ *****/
+
+#ifndef PARSER_H
+#define PARSER_H
+
+#include "common.h"
+#include "absyn.h"
+
+namespace parser {
+
+// Opens and parses the file returning the abstract syntax tree. If
+// there is an unrecoverable parse error, returns null.
+absyntax::file *parseFile(const string& filename,
+ const char *nameOfAction);
+
+// Parses string and returns the abstract syntax tree. Any error in lexing or
+// parsing will be reported and a handled_error thrown. If the string is
+// "extendable", then a parse error simply due to running out of input will not
+// throw an exception, but will return null.
+absyntax::file *parseString(const string& code,
+ const string& filename,
+ bool extendable=false);
+} // namespace parser
+
+#endif // PARSER_H