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A parser is a compiler or interpreter component that breaks data into smaller elements for easy translation into another language. A parser takes input in the form of a sequence of tokens or program instructions and usually builds a data structure in the form of a parse tree or an abstract syntax tree.
A parser is commonly used as a component of an interpreter or a compiler. The overall process of parsing involves three stages:
A parser's main purpose is to determine if input data may be derived from the start symbol of the grammar. If yes, then in what ways can this input data be derived? This is achieved as follows:
Parsers are widely used in the following technologies: