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Programmer parsers are used to ensure that code written in a particular programming language complies with its syntax rules. They receive input text and verify whether it's correctly structured according to the grammar of the given language. Parsers consist of two primary components: a lexer (also known as tokenizer) and syntax analyzer (or parser proper). The lexer breaks down the input into tokens, which are small units containing type information about their role in the programming language's syntax. The parser then uses these tokens to build an abstract syntax tree (AST) representation of the program, where each node represents a construct in the source code (e.g., statements or expressions). If the input doesn't match with these syntactic rules, an error is reported to indicate where and what went wrong. Once parsed, compilers or interpreters can use this AST for further processing towards generating executable code or directly interpreting behavior.

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