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如何在 ConTeXt 中调用 CSV 中的特定数据行？

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如何在 ConTeXt 中调用 CSV 中的特定数据行？

我有一个 CSV 文件，使用“@”作为分隔符，包含如下数据：

 Code     @ Title        @ Page     @ Tags                    @ File
 001      @ Buying Tips  @ 1        @ seafood, fish, octopus  @ 1.pdf
 001      @ Buying Tips  @ 2        @ oranges, apples         @ 2.pdf
 001      @ Buying Tips  @ 3        @ bananas                 @ 3.pdf
 002      @ Food Waste   @ 1        @ compost, apples         @ 4.pdf
 002      @ Food Waste   @ 2        @ plastic, paper, bags    @ 5.pdf

我需要从 CSV 文件中调用特定数据，要么显示在特定行中找到的信息，要么显示在最后一列列出的文件。

例如：

  • 显示代码 002 的第 1 页（将显示 4.pdf）。
  • 显示带有标签“apples”的所有页面（将显示 2.pdf 和 4.pdf）。
  • 仅显示 CSV 中带有标签“apples”的第 2 个出现的项目（将显示 4.pdf）。
  • 显示第 2 页的标题，代码 1（显示“购买提示”）。

ConTeXt 是否有任何方法可以以这种方式从 CSV 文件中调用数据？

答案1

您可以使用 ConTeXt 内置的 来解析 CSV 文件的内容rfc4180splitter。然后可以使用一些 Lua 代码轻松实现您给出的示例。这里我展示了解析器的用法，以帮助您入门。在util-prs.lua，你一定要看看。

\startbuffer[csv]
Code     @ Title        @ Page     @ Tags                    @ File
001      @ Buying Tips  @ 1        @ seafood, fish, octopus  @ 1.pdf
001      @ Buying Tips  @ 2        @ oranges, apples         @ 2.pdf
001      @ Buying Tips  @ 3        @ bananas                 @ 3.pdf
002      @ Food Waste   @ 1        @ compost, apples         @ 4.pdf
002      @ Food Waste   @ 2        @ plastic, paper, bags    @ 5.pdf
\stopbuffer

\startluacode
local csvsplitter = utilities.parsers.rfc4180splitter{separator = "@"}
local rows, colnames = csvsplitter(buffers.getcontent"csv", true)

-- Show what has been parsed on the terminal
inspect(rows)
inspect(colnames)

-- Now pick data and process to your liking
-- ...
\stopluacode

\starttext

\stoptext

在终端上你会看到

table={
 { "001      ", " Buying Tips  ", " 1        ", " seafood, fish, octopus  ", " 1.pdf" },
 { "001      ", " Buying Tips  ", " 2        ", " oranges, apples         ", " 2.pdf" },
 { "001      ", " Buying Tips  ", " 3        ", " bananas                 ", " 3.pdf" },
 { "002      ", " Food Waste   ", " 1        ", " compost, apples         ", " 4.pdf" },
 { "002      ", " Food Waste   ", " 2        ", " plastic, paper, bags    ", " 5.pdf" },
}
table={
 "Code     ",
 " Title        ",
 " Page     ",
 " Tags                    ",
 " File",
}

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