mirror of https://github.com/CrimsonTome/tldr.git
27 lines
690 B
Markdown
27 lines
690 B
Markdown
# flex
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> Lexical analyzer generator. A rewrite of `lex` with extensions to the POSIX specification.
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> Given the specification for a lexical analyzer, generates C code implementing it.
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> Note: long options don't work on OpenBSD.
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> More information: <https://manned.org/flex>.
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- Generate an analyzer from a flex file, storing it to the file `lex.yy.c`:
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`lex {{analyzer.l}}`
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- Write analyzer to `stdout`:
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`lex -{{-stdout|t}} {{analyzer.l}}`
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- Specify the output file:
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`lex {{analyzer.l}} -o {{analyzer.c}}`
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- Generate a [B]atch scanner instead of an interactive scanner:
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`lex -B {{analyzer.l}}`
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- Compile a C file generated by Lex:
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`cc {{path/to/lex.yy.c}} --output {{executable}}`
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