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# Preprocessing
In the preprocessing step, the expl3 analysis tool determines which parts of the input files contain expl3 code. Inline `\TeX`{=tex} comments that disable warnings and errors are also analyzed in this step.
## No standard delimiters {.w label=w100}
An input file contains no delimiters such as `\ExplSyntaxOn`, `\ExplSyntaxOff`, `\ProvidesExplPackage`, `\ProvidesExplClass`, and `\ProvidesExplFile` [@latexteam2024interfaces, Section 2.1]. The analysis tool should assume that the whole input file is in expl3.
/w100.tex
## Unexpected delimiters {.w label=w101}
An input file contains extraneous `\ExplSyntaxOn` delimiters [@latexteam2024interfaces, Section 2.1] in expl3 parts or extraneous `\ExplSyntaxOff` delimiters in non-expl3 parts.
/w101.tex
## Expl3 material in non-expl3 parts {.e label=e102}
An input file contains what looks like expl3 material [@latexteam2024interfaces, Section 1.1] in non-expl3 parts.
/e102.tex
## Line too long {.s label=s103}
Some lines in expl3 parts are longer than 80 characters [@latexteam2024style, Section 2].
/s103.tex
The maximum line length can be configured using the command-line option `--max-line-length` or with the parameter `max_line_length` of the function returned by the Lua module `explcheck-preprocessing`.
## Multiple delimiters `\ProvidesExpl*` in a single file {.e label=e104}
An input file contains multiple delimiters `\ProvidesExplPackage`, `\ProvidesExplClass`, and `\ProvidesExplFile`.
/e104.tex
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