#marianoguerra/shrubbery

#Installing

moon add marianoguerra/shrubbery

import {
  "marianoguerra/shrubbery" @shrub,
  "marianoguerra/shrubbery/ast",
}

#Parsing

///|
test {
  let parsed = @shrub.parse("def pi = 3.14\n")
  inspect(
    parsed.root().canonical(),
    content="(multi (group |def| |pi| (op |=|) #f64:40091eb851eb851f))",
  )
}

///|
test {
  let parsed = @shrub.parse("if x\n| yes\n| no\n")
  inspect(
    parsed.root().canonical(),
    content="(multi (group |if| |x| (alts (block (group |yes|)) (block (group |no|)))))",
  )
}

#Every node remembers its source

///|
test {
  let src =
    #|f(1, /* two */ 2):
    #|  body  // trailing
    #|
  let parsed = @shrub.parse(src)
  assert_eq(@shrub.to_source(parsed.root()), src)
}

#Printing

///|
test {
  let parsed = @shrub.parse("hello:\n  world\n  universe\n")
  // Line- and column-insensitive: safe to re-indent, wrap, or paste anywhere.
  inspect(@shrub.write(parsed.root()), content="hello:« world; universe »")
  // Or laid out to a width.
  inspect(
    @shrub.write(parsed.root(), style=Pretty, width=Some(0)),
    content=(
      #|hello:
      #|  world
      #|  universe
    ),
  )
}

#Errors are data

///|
test {
  let src = "hello:\n  world\n universe\n"
  let kind = try {
    let _ = @shrub.parse(src)
    None
  } catch {
    ShrubberyError(d) => Some(d.kind)
  }
  assert_true(kind is Some(WrongIndentation(_)))
}

///|
test {
  let parsed = @shrub.parse("a:\n  b\n c\nd:\n  e\n f\n", recover=true)
  assert_eq(parsed.diagnostics().length(), 2)
}

///|
test {
  let src = "hello:\n  world\n universe\n"
  let sources = @report.Sources::new()
  let id = sources.add("greeting.shrub", src)
  let out = try {
    let _ = @shrub.parse(src)
    ""
  } catch {
    ShrubberyError(d) =>
      @render.render_string(@shrub.to_report(d, id), sources, {
        ..@render.default_config,
        theme: @style.mono_theme,
        color: Never,
      })
  }
  inspect(
    out,
    content=(
      #|error[shrubbery::wrong_indentation]: this group is not indented like the ones around it
      #|  ╭─[ greeting.shrub:3:2 ]
      #|  │
      #|2 │   world
      #|3 │  universe
      #|  │  ───┬────
      #|  │     ╰─ this column does not line up
      #|  │
      #|  ├─ help: every group in a sequence starts at the same column
      #|  ╰─
      #|
    ),
  )
}

#Tokens

///|
test {
  let toks = @shrub.tokens("x + y\n")
  inspect(toks.length(), content="7")
  let buf = StringBuilder()
  for t in toks {
    buf.write_string(t.text)
  }
  assert_eq(buf.to_string(), "x + y\n")
}

#Limits

#Correctness

#Licence