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[Feature Request]: Support code dependency on a single expression with multiple assignments

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技术栈
r
领域
tooling

调研方向

从 issue 中描述的 eval_code() 和 get_code() 入口点开始,然后运行为链式赋值提供的 testthat 测试用例。实现对 <-、-> 和混合赋值链的支持,使每个被赋值的变量都返回原始表达式,并确认全部三个示例都通过。

由索引模型根据 Issue 内容生成。

描述

core enhancement
Feature description

Such as var1 <- var2 <- 2

pkgload::load_all("../teal.code")
#> ℹ Loading teal.code
code <- "var1 <- var2 <- 1"
td <- eval_code(qenv(), code)
get_code(td, names = "var1")
#> [1] "var1 <- var2 <- 1"
get_code(td, names = "var2")
#> Warning: Object(s) not found in code: var2.
#> [1] ""

Created on 2025-04-30 with reprex v2.1.1

See test suite below for test-driven development

testthat::describe("detects multiple assignments in single line", {
  testthat::it("<-", {
    # testthat::skip("Not implemented")
    code <- "var1 <- var2 <- 1"
    td <- eval_code(qenv(), code)

    testthat::expect_identical(get_code(td, names = "var1"), code)
    testthat::expect_identical(get_code(td, names = "var2"), code)
  })

  testthat::it("->", {
    code <- "1 -> var1 -> var2"
    td <- eval_code(qenv(), code)

    testthat::expect_identical(
      get_code(td, names = "var1"),
      as.character(parse(text = code, keep.source = TRUE))
    )

    testthat::expect_identical(get_code(td, names = "var1"), code)
    testthat::expect_identical(get_code(td, names = "var2"), code)
  })

  testthat::it("<- and ->", {
    code <- "var1 <- 1 -> var2"
    td <- eval_code(qenv(), code)

    testthat::expect_identical(get_code(td, names = "var1"), code)
    testthat::expect_identical(get_code(td, names = "var2"), code)
  })
})
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主要语言
R
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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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