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* arguments are managed through boost::program_options
* default continues to be the REPL
* "--tree" argument switches from calculation to tree export
* "--input" may be used to pass terms to be evaluated via CLI arguments
** disables REPL
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* "doubleToString" converts a string to double, i.e. it should be named "stringToDouble"…
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* while integer division through zero is obviously a low level error that should be prevented, this operation is well-defined for floating point values as used by SimpleParser
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* member method "addNode" of "Tree" was relieved of its uneccessary "place" argument
* again contified where possible
** e.g. the "buildTree" local element vectors for storing the lexer result
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* as with all Node classes the public member methods of the "Tree" class do not need to be non-const
* both constructors are more easily expressed as aliases of a single constructor that takes both the term and a pointer to a constant map instance
* the tree is now constructed during member initialization
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* there is no reason for exposing them to be potentially linked to from other compilation units
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* marked "solve" and "print" implementations as const
* converted member variables into constants where possible
* "type" member method is not necessary and partially defeats the purpose of declaring virtual members
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* "new" in Tree::addNode member method was replaced with C++14 std::make_unique
* renamed and constified lexer local variables to increase readabilty
** replaced chunky if-clauses with switch-clauses where appropriate
* updated README.md to mention C++14 requirement
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* now using range for-loops during Tree printing
* inroduced popNode helper method which helps to simplify the Tree construction implementation
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* cmake offers a more straight forward and easier understandable way of building this project
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* SimpleParser optionally acceps a pointer to an ConstantMap containing string keys mapping to values
* Constants are handled in their own ConstantNode class derived from the standard Node class
* Operator precedence is now determined separated from the TokenType using a new PrecedenceLevel enum
** Conversion between tokens and their PrecedenceLevel is possible using the new utility function getPrecedence
* Added additional test cases for constant identifier resolutions
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Added ConstantNode blueprint
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* OperatorNode class now uses TokenType for internal operator storage and logic selection
* print-Method resolves the TokenType back into its character representation
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Conflicts:
src/tree.cc
src/utils.cc
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* Made implementation more expressive by replacing the integer priority with an strictly typed enum called TokenType
** Made removal of character comparisons from tree construction and lexer possible
* As a side effect distinct numbers had to be assigned to each token
** Operators of same priority do not have identical numbers anymore
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* New priority for alphabetic characters
* Overloaded OperandNode constructor
* Currently not usable, only basic proof of concept
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* Invalid input syntax led to undefined behavior when accessing the top element of an empty stack
** Fixed by introducing a new "topNodeFrom" function which throws an exeption in the case that the given std::stack reference is empty
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* library is called libSimpleParser.so
* parser was renamed to clc
* test and clc are using the shared library
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* Enabled tree to generate itself
** Main work is now done during tree construction
* Moved lexer and getPriority utility functions into separate compilation unit
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to the libary user by providing a new plain "exportTree" function
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priority determination and tree building functions were hidden in
unnamed namespace
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derivatives of Node into a template function
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