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- Lex is a program that generates lexical analyzer. It is used with YACC parser generator.
- The lexical analyzer is a program that transforms an input stream into a sequence of tokens.
- It reads the input stream and produces the source code as output through implementing the lexical analyzer in the C program.
Online SQL Editor Run your SQL code using myCompiler's online IDE. Fiddle with your code snippets easily and run them. Start writing code instantly without having to download or install anything. Install Bisonat “C:GnuWin32“. Install DevCat “C:Dev-Cpp“. Open Environment Variables. Add “C:GnuWin32bin;C:Dev-Cppbin;” to path. The function of Lex is as follows: Firstly lexical analyzer creates a program lex.1 in the Lex language. Then Lex compiler runs the lex.1 program and produces a C program lex. LEX: Lex - A Lexical Analyzer Generator M. Lex helps write programs whose control flow is directed by instances of regular expressions in the input stream. It is well suited for editor-script type transformations and for segmenting input in preparation for a parsing routine.
The function of Lex is as follows:
- Firstly lexical analyzer creates a program lex.1 in the Lex language. Then Lex compiler runs the lex.1 program and produces a C program lex.yy.c.
- Finally C compiler runs the lex.yy.c program and produces an object program a.out.
- a.out is lexical analyzer that transforms an input stream into a sequence of tokens.
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Lex file format
A Lex program is separated into three sections by %% delimiters. The formal of Lex source is as follows:
Definitions include declarations of constant, variable and regular definitions.
Rules define the statement of form p1 {action1} p2 {action2}....pn {action}.
Where pi describes the regular expression and action1 describes the actions what action the lexical analyzer should take when pattern pi matches a lexeme.
User subroutines are auxiliary procedures needed by the actions. The subroutine can be loaded with the lexical analyzer and compiled separately.
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