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[1] [2] It is commonly used with the yacc parser generator and is the standard lexical analyzer generator on many Unix and Unix-like systems. An equivalent tool is specified as part of the POSIX standard. [3] Lex reads an input stream specifying the lexical analyzer and writes source code which implements the lexical analyzer in the C ...
Flex (fast lexical analyzer generator) is a free and open-source software alternative to lex. [2] It is a computer program that generates lexical analyzers (also known as "scanners" or "lexers").
The meta language of JetPAG grammars was designed to be maximally flexible handle both simple grammars and large, complicated ones easily. Parsers and lexical analyzers are similarly defined and generated for simplicity and ease of use. This is a simple example of a grammar for a basic calculator:
The RE/flex lexical analyzer generator accepts an extended syntax of Flex lexer specifications as input. The RE/flex specification syntax is more expressive than the traditional Flex lexer specification syntax and may include indentation anchors, word boundaries, lazy quantifiers (non-greedy, lazy repeats), and new actions such as wstr() to ...
Versions 1.0 through 4.0 were sold exclusively by Oxford University Press, the current version 8.0 and previous versions are now also distributed by Lexical Analysis Software Limited. The software runs under Windows. WordSmith is a download-only product which is registered by entering a code costing 50 pounds sterling for a single user license.
Ragel's input is a regular expression only in the sense that it describes a regular language; it is usually not written in a concise regular expression, but written out into multiple parts like in Extended Backus–Naur form. For example, instead of supporting POSIX character classes in regex syntax, Ragel implements them as built-in production ...
With increasing complexity and demands for source code analysis in modern integrated development environments, however, compilers need to expose application programming interfaces (APIs) that will help developers to directly perform phases of compilation such as lexical and syntactic structure analysis of source code. Roslyn was designed with ...
Yacc (Yet Another Compiler-Compiler) is a computer program for the Unix operating system developed by Stephen C. Johnson.It is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar, written in a notation similar to Backus–Naur form (BNF). [1]