/everypar.tex
Secret
Last active May 20, 2018
demo for box opening and closing
| % \UseBox 直接忽略参数 | |
| \def\UseBox#1{\relax} | |
| \newbox\parbox | |
| \everypar{\setbox\parbox= | |
| \vbox\bgroup | |
| \everypar{} | |
| \def\par{\egroup\UseBox\parbox}} | |
| % 因此，"Hello world!" 被吃进盒子之后没有机会输出 | |
| Hello world! | |
| \everypar{} | |
| % 由于 \everypar 被重定义为空，因此 "Hello Liam!" 正常输出 | |
| Hello Liam! | |
| \bye |
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