Class representing XML source of a Carpentries episode

Wrapper around an xml document to manipulate and inspect Carpentries episodes

Details

The Episode class is a superclass of tinkr::yarn(), which transforms (commonmark-formatted) Markdown to XML and back again. The extension that the Episode class provides is support for both Pandoc and kramdown flavours of Markdown.

Read more about this class in vignette("intro-episode", package = "pegboard").

Note

The current XLST spec for tinkr does not support kramdown, which the Carpentries Episodes are styled with, thus some block tags will be destructively modified in the conversion.

Super class

tinkr::yarn -> Episode

Public fields

children: [character] a vector of absolute paths to child files if they exist.
parents: [character] a vector of absolute paths to immediate parent files if they exist
build_parents: [character] a vector of absolute paths to the final parent files that will trigger this child file to build

Active bindings

show_problems: [list] a list of all the problems that occurred in parsing the episode
headings: [xml_nodeset] all headings in the document
links: [xml_nodeset] all links (not images) in the document
images: [xml_nodeset] all image sources in the document
tags: [xml_nodeset] all the kramdown tags from the episode
questions: [character] the questions from the episode
keypoints: [character] the keypoints from the episode
objectives: [character] the objectives from the episode
challenges: [xml_nodeset] all the challenges blocks from the episode
solutions: [xml_nodeset] all the solutions blocks from the episode
output: [xml_nodeset] all the output blocks from the episode
error: [xml_nodeset] all the error blocks from the episode
warning: [xml_nodeset] all the warning blocks from the episode
code: [xml_nodeset] all the code blocks from the episode
name: [character] the name of the source file without the path
lesson: [character] the path to the lesson where the episode is from
has_children: [logical] an indicator of the presence of child files (TRUE) or their absence (FALSE)
has_parents: [logical] an indicator of the presence of parent files (TRUE) or their absence (FALSE)

Methods

Inherited methods

Method `new()`

Create a new Episode

Usage

Episode$new(
  path = NULL,
  process_tags = TRUE,
  fix_links = TRUE,
  fix_liquid = FALSE,
  parents = NULL,
  ...
)

Arguments

path: [character] path to a markdown episode file on disk
process_tags: [logical] if TRUE (default), kramdown tags will be processed into attributes of the parent nodes. If FALSE, these tags will be treated as text
fix_links: [logical] if TRUE (default), links pointing to liquid tags (e.g. {{ page.root }}) and included links (those supplied by a call to {\% import links.md \%}) will be appropriately processed as valid links.
fix_liquid: [logical] defaults to FALSE, which means data is immediately passed to tinkr::yarn. If TRUE, all liquid variables in relative links have spaces removed to allow the commonmark parser to interpret them as links.
parents: [list] a list of Episode objects that represent the immediate parents of this child
...: arguments passed on to tinkr::yarn and tinkr::to_xml()

Returns

A new Episode object with extracted XML data

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$name
scope$lesson
scope$challenges

Method `confirm_sandpaper()`

enforce that the episode is a sandpaper episode withtout going through the conversion steps. The default Episodes from pegboard were assumed to be generated using Jekyll with kramdown syntax. This is a bit of a kludge to bypass the normal checks for kramdown syntax and just assume pandoc syntax

Usage

Episode$confirm_sandpaper()

Method `get_blocks()`

return all block_quote elements within the Episode

Usage

Episode$get_blocks(type = NULL, level = 1L)

Arguments

type: the type of block quote in the Jekyll syntax like ".challenge", ".discussion", or ".solution"
level: the level of the block within the document. Defaults to 1, which represents all of the block_quotes are not nested within any other block quotes. Increase the nubmer to increase the level of nesting.

Returns

[xml_nodeset] all the blocks from the episode with the given tag and level.

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
# get all the challenges
scope$get_blocks(".challenge")
# get the solutions
scope$get_blocks(".solution", level = 2)
\dontrun{

  # download the source files for r-novice-gampinder into a Lesson object
  rng <- get_lesson("swcarpentry/r-novice-gapminder")
  dsp1 <- rng$episodes[["04-data-structures-part1.md"]]
  # There are 9 blocks in total
  dsp1$get_blocks()
  # One is a callout block
  dsp1$get_blocks(".callout")
  # One is a discussion block
  dsp1$get_blocks(".discussion")
  # Seven are Challenge blocks
  dsp1$get_blocks(".challenge")
  # There are eight solution blocks:
  dsp1$get_blocks(".solution", level = 2L)
}

Method `get_images()`

fetch the image sources and optionally process them for easier parsing. The default version of this function is equivalent to the active binding $images.

Usage

Episode$get_images(process = FALSE)

Arguments

process: if TRUE, images will be processed via the internal function process_images(), which will add the alt attribute, if available and extract img nodes from HTML blocks.

Returns

an xml_nodelist

Examples


loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$get_images()
loop$get_images(process = TRUE)

Method `label_divs()`

label all the div elements within the Episode to extract them with $get_divs()

Usage

Episode$label_divs()

Method `get_divs()`

return all div elements within the Episode

Usage

Episode$get_divs(type = NULL, include = FALSE)

Arguments

type: the type of div tag (e.g. 'challenge' or 'solution')
include: \[logical\] if TRUE, the div tags will be included in the output. Defaults to FALSE, which will only return the text between the div tags.

Method `get_yaml()`

Extract the yaml metadata from the episode

Usage

Episode$get_yaml()

Method `use_dovetail()`

Ammend or add a setup code block to use {dovetail}

This will convert your lesson to use the dovetail R package for processing specialized block quotes which will do two things:

convert your lesson from md to Rmd
add to your setup chunk the following code
```
library('dovetail')
source(dvt_opts())
```

If there is no setup chunk, one will be created. If there is a setup chunk, then the source and knitr_fig_path calls will be removed.

Usage

Episode$use_dovetail()

Method `use_sandpaper()`

Use the sandpaper package for processing

This will convert your lesson to use the {sandpaper} R package for processing the lesson instead of Jekyll (default). Doing this will have the following effects:

code blocks that were marked with liquid tags (e.g. {: .language-r} are converted to standard code blocks or Rmarkdown chunks (with language information at the top of the code block)
If rmarkdown is used and the lesson contains python code, library('reticulate') will be added to the setup chunk of the lesson.

Usage

Episode$use_sandpaper(rmd = FALSE, yml = list())

Arguments

rmd: if TRUE, lessons will be converted to RMarkdown documents
yml: the list derived from the yml file for the episode

Method `remove_error()`

Remove error blocks

Usage

Episode$remove_error()

Method `remove_output()`

Remove output blocks

Usage

Episode$remove_output()

Method `move_objectives()`

move the objectives yaml item to the body

Usage

Episode$move_objectives()

Method `move_keypoints()`

move the keypoints yaml item to the body

Usage

Episode$move_keypoints()

Method `move_questions()`

move the questions yaml item to the body

Usage

Episode$move_questions()

Method `get_challenge_graph()`

Create a graph of the top-level elements for the challenges.

Usage

Episode$get_challenge_graph(recurse = TRUE)

Arguments

recurse: if TRUE (default), the content of the solutions will be included in the graph; FALSE will keep the solutions as block_quote elements.

Returns

a data frame with four columns representing all the elements within the challenges in the Episode:

Block: The sequential number of the challenge block
from: the inward elements
to: the outward elements
pos: the position in the markdown document

Note that there are three special node names:

challenge: start or end of the challenge block
solution: start of the solution block
lesson: start of the lesson block

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$get_challenge_graph()

Method `show()`

show the markdown contents on the screen

Usage

Episode$show(n = TRUE)

Arguments

n: a subset of elements to show, default TRUE for all lines

Returns

a character vector with one line for each line of output

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$head()
scope$tail()
scope$show()

Method `head()`

show the first n lines of markdown contents on the screen

Usage

Episode$head(n = 6L)

Arguments

n: the number of lines to show from the top

Returns

a character vector with one line for each line of output

Method `tail()`

show the first n lines of markdown contents on the screen

Usage

Episode$tail(n = 6L)

Arguments

n: the number of lines to show from the top

Returns

a character vector with one line for each line of output

Method `write()`

write the episode to disk as markdown

Usage

Episode$write(path = NULL, format = "md", edit = FALSE)

Arguments

path: the path to write your file to. Defaults to an empty directory in your temporary folder
format: one of "md" (default) or "xml". This will create a file with the correct extension in the path
edit: if TRUE, the file will open in an editor. Defaults to FALSE.

Returns

the episode object

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$write()

Method `handout()`

Create a trimmed-down RMarkdown document that strips prose and contains only important code chunks and challenge blocks without solutions.

Usage

Episode$handout(path = NULL, solutions = FALSE)

Arguments

path: (handout) a path to an R Markdown file to write. If this is NULL, no file will be written and the lines of the output will be returned.
solutions: if TRUE, include solutions in the output. Defaults to FALSE, which removes the solution blocks.

Returns

a character vector if path = NULL, otherwise, it is called for the side effect of creating a file.

Examples

lsn <- Lesson$new(lesson_fragment("sandpaper-fragment"), jekyll = FALSE)
e <- lsn$episodes[[1]]
cat(e$handout())
cat(e$handout(solution = TRUE))

Method `reset()`

Re-read episode from disk

Usage

Episode$reset()

Returns

the episode object

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
xml2::xml_text(scope$tags[1])
xml2::xml_set_text(scope$tags[1], "{: .code}")
xml2::xml_text(scope$tags[1])
scope$reset()
xml2::xml_text(scope$tags[1])

Method `isolate_blocks()`

Remove all elements except for those within block quotes that have a kramdown tag. Note that this is a destructive process.

Usage

Episode$isolate_blocks()

Returns

the Episode object, invisibly

Examples

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$body # a full document with block quotes and code blocks, etc
scope$isolate_blocks()$body # only one challenge block_quote

Method `unblock()`

convert challenge blocks to roxygen-like code blocks

Usage

Episode$unblock(token = "#'", force = FALSE)

Arguments

token: the token to use to indicate non-code, Defaults to "#'"
force: force the conversion even if the conversion has already taken place

Returns

the Episode object, invisibly

Examples

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$body # a full document with block quotes and code blocks, etc
loop$get_blocks() # all the blocks in the episode
loop$unblock()
loop$get_blocks() # no blocks
loop$code # now there are two blocks with challenge tags

Method `summary()`

Get a high-level summary of the elements in the episode

Usage

Episode$summary()

Returns

a data frame with counts of the following elements per page:

sections: level 2 headings
headings: all headings
callouts: all callouts
challenges: subset of callouts
solutions: subset of callouts
code: all code block elements (excluding inline code)
output: subset of code that is displayed as output
warnining: subset of code that is displayed as a warning
error: subset of code that is displayed as an error
images: all images in markdown or HTML
links: all links in markdown or HTML

Method `validate_headings()`

perform validation on headings in a document.

This will validate the following aspects of all headings:

first heading starts at level 2 (first_heading_is_second_level)
greater than level 1 (greater_than_first_level)
increse sequentially (e.g. no jumps from 2 to 4) (are_sequential)
have names (have_names)
unique in their own hierarchy (are_unique)

Usage

Episode$validate_headings(verbose = TRUE, warn = TRUE)

Arguments

verbose: if TRUE (default), a message for each rule broken will be issued to the stderr. if FALSE, this will be silent.
warn: if TRUE (default), a warning will be issued if there are any failures in the tests.

Returns

a data frame with a variable number of rows and the follwoing columns:

episode the filename of the episode
heading the text from a heading
level the heading level
pos the position of the heading in the document
node the XML node that represents the heading
(the next five columns are the tests listed above)
path the path to the file.

Each row in the data frame represents an individual heading across the Lesson. See validate_headings() for more details.

Examples

# Example: There are multiple headings called "Solution" that are not
# nested within a higher-level heading and will throw an error
loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_headings()

Method `validate_divs()`

perform validation on divs in a document.

This will validate the following aspects of divs. See validate_divs() for details.

divs are of a known type (is_known)

Usage

Episode$validate_divs(warn = TRUE)

Arguments

warn: if TRUE (default), a warning message will be if there are any divs determined to be invalid. Set to FALSE if you want the table for processing later.

Returns

a logical TRUE for valid divs and FALSE for invalid divs.

Examples

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_divs()

Method `validate_links()`

perform validation on links and images in a document.

This will validate the following aspects of links. See validate_links() for details.

External links use HTTPS (enforce_https)
Internal links exist (internal_okay)
External links are reachable (all_reachable) (planned)
Images have alt text (img_alt_text)
Link text is descriptive (descriptive)
Link text is more than a single letter (link_length)

Usage

Episode$validate_links(warn = TRUE)

Arguments

warn: if TRUE (default), a warning message will be if there are any links determined to be invalid. Set to FALSE if you want the table for processing later.

Returns

a logical TRUE for valid links and FALSE for invalid links.

Examples

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_links()

Method `clone()`

The objects of this class are cloneable with this method.

Usage

Episode$clone(deep = FALSE)

Arguments

deep: Whether to make a deep clone.

Examples


## ------------------------------------------------
## Method `Episode$new`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$name
#> [1] "17-scope.md"
scope$lesson
#> [1] "/home/runner/work/_temp/Library/pegboard/lesson-fragment"
scope$challenges
#> {xml_nodeset (2)}
#> [1] <block_quote sourcepos="45:1-60:14" ktag="{: .challenge}">\n  <heading so ...
#> [2] <block_quote sourcepos="62:1-95:14" ktag="{: .challenge}">\n  <heading so ...

## ------------------------------------------------
## Method `Episode$get_blocks`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
# get all the challenges
scope$get_blocks(".challenge")
#> {xml_nodeset (2)}
#> [1] <block_quote sourcepos="45:1-60:14" ktag="{: .challenge}">\n  <heading so ...
#> [2] <block_quote sourcepos="62:1-95:14" ktag="{: .challenge}">\n  <heading so ...
# get the solutions
scope$get_blocks(".solution", level = 2)
#> {xml_nodeset (0)}
if (FALSE) { # \dontrun{

  # download the source files for r-novice-gampinder into a Lesson object
  rng <- get_lesson("swcarpentry/r-novice-gapminder")
  dsp1 <- rng$episodes[["04-data-structures-part1.md"]]
  # There are 9 blocks in total
  dsp1$get_blocks()
  # One is a callout block
  dsp1$get_blocks(".callout")
  # One is a discussion block
  dsp1$get_blocks(".discussion")
  # Seven are Challenge blocks
  dsp1$get_blocks(".challenge")
  # There are eight solution blocks:
  dsp1$get_blocks(".solution", level = 2L)
} # }

## ------------------------------------------------
## Method `Episode$get_images`
## ------------------------------------------------


loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$get_images()
#> {xml_nodeset (5)}
#> [1] <html_block sourcepos="174:1-174:86" xml:space="preserve">&lt;img src="ht ...
#> [2] <html_block sourcepos="176:1-176:49" xml:space="preserve">&lt;img src=".. ...
#> [3] <image sourcepos="180:1-180:74" destination="https://carpentries.org/asse ...
#> [4] <image sourcepos="182:1-182:38" destination="../no-workie.svg" title="">\ ...
#> [5] <image destination="{{ page.root }}/no-workie.svg" sourcepos="184:1-184:7 ...
loop$get_images(process = TRUE)
#> {xml_nodeset (5)}
#> [1] <img src="https://carpentries.org/assets/img/TheCarpentries.svg" alt="boo ...
#> [2] <img src="../no-workie.svg" alt="books as clubs" destination="../no-worki ...
#> [3] <image sourcepos="180:1-180:74" destination="https://carpentries.org/asse ...
#> [4] <image sourcepos="182:1-182:38" destination="../no-workie.svg" title="">\ ...
#> [5] <image destination="{{ page.root }}/no-workie.svg" sourcepos="184:1-184:7 ...

## ------------------------------------------------
## Method `Episode$get_challenge_graph`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$get_challenge_graph()
#>   Block       from         to        pos level
#> 1     1  challenge    heading 45:1-60:14     1
#> 2     1    heading  paragraph 45:3-45:34     1
#> 3     1  paragraph code_block 47:3-48:68     1
#> 4     1 code_block     lesson  50:3-58:5     1
#> 5     2  challenge    heading 62:1-95:14     1
#> 6     2    heading  paragraph 62:3-62:27     1
#> 7     2  paragraph       list 64:3-64:55     1
#> 8     2       list code_block  66:3-72:1     1
#> 9     2 code_block     lesson  73:3-93:5     1

## ------------------------------------------------
## Method `Episode$show`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$head()
#> ---
#> title: "Variable Scope"
#> teaching: 10
#> exercises: 10
#> questions:
#> - "How do function calls actually work?"
scope$tail()
#> > 
#> > KeyError: 'Friday'
#> > ```
#> > {: .error}
#> {: .challenge}
#> 
scope$show()
#> ---
#> title: "Variable Scope"
#> teaching: 10
#> exercises: 10
#> questions:
#> - "How do function calls actually work?"
#> - "How can I determine where errors occurred?"
#> objectives:
#> - "Identify local and global variables."
#> - "Identify parameters as local variables."
#> - "Read a traceback and determine the file, function, and line number on which the error occurred, the type of error, and the error message."
#> keypoints:
#> - "The scope of a variable is the part of a program that can 'see' that variable."
#> ---
#> 
#> ## The scope of a variable is the part of a program that can 'see' that variable.
#> 
#> - There are only so many sensible names for variables.
#> - People using functions shouldn't have to worry about
#>   what variable names the author of the function used.
#> - People writing functions shouldn't have to worry about
#>   what variable names the function's caller uses.
#> - The part of a program in which a variable is visible is called its *scope*.
#> 
#> ```
#> pressure = 103.9
#> 
#> def adjust(t):
#>     temperature = t * 1.43 / pressure
#>     return temperature
#> ```
#> {: .language-python}
#> 
#> - `pressure` is a *global variable*.
#>   - Defined outside any particular function.
#>   - Visible everywhere.
#> - `t` and `temperature` are *local variables* in `adjust`.
#>   - Defined in the function.
#>   - Not visible in the main program.
#>   - Remember: a function parameter is a variable
#>     that is automatically assigned a value when the function is called.
#> 
#> ```
#> print('adjusted:', adjust(0.9))
#> print('temperature after call:', temperature)
#> ```
#> {: .language-python}
#> 
#> ```
#> adjusted: 0.01238691049085659
#> ```
#> {: .output}
#> 
#> ```
#> Traceback (most recent call last):
#>   File "/Users/swcarpentry/foo.py", line 8, in <module>
#>     print('temperature after call:', temperature)
#> NameError: name 'temperature' is not defined
#> ```
#> {: .error}
#> 
#> > ## Local and Global Variable Use
#> > 
#> > Trace the values of all variables in this program as it is executed.
#> > (Use '---' as the value of variables before and after they exist.)
#> > 
#> > ```
#> > limit = 100
#> > 
#> > def clip(value):
#> >     return min(max(0.0, value), limit)
#> > 
#> > value = -22.5
#> > print(clip(value))
#> > ```
#> > {: .language-python}
#> {: .challenge}
#> 
#> > ## Reading Error Messages
#> > 
#> > Read the traceback below, and identify the following:
#> > 
#> > 1. How many levels does the traceback have?
#> > 2. What is the file name where the error occurred?
#> > 3. What is the function name where the error occurred?
#> > 4. On which line number in this function did the error occur?
#> > 5. What is the type of error?
#> > 6. What is the error message?
#> > 
#> > ```
#> > ---------------------------------------------------------------------------
#> > KeyError                                  Traceback (most recent call last)
#> > <ipython-input-2-e4c4cbafeeb5> in <module>()
#> >       1 import errors_02
#> > ----> 2 errors_02.print_friday_message()
#> > 
#> > /Users/ghopper/thesis/code/errors_02.py in print_friday_message()
#> >      13
#> >      14 def print_friday_message():
#> > ---> 15     print_message("Friday")
#> > 
#> > /Users/ghopper/thesis/code/errors_02.py in print_message(day)
#> >       9         "sunday": "Aw, the weekend is almost over."
#> >      10     }
#> > ---> 11     print(messages[day])
#> >      12
#> >      13
#> > 
#> > KeyError: 'Friday'
#> > ```
#> > {: .error}
#> {: .challenge}
#> 

## ------------------------------------------------
## Method `Episode$write`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$write()
#> Creating temporary directory '/tmp/RtmpVnZXPE/dir17816459f8e0'

## ------------------------------------------------
## Method `Episode$handout`
## ------------------------------------------------

lsn <- Lesson$new(lesson_fragment("sandpaper-fragment"), jekyll = FALSE)
e <- lsn$episodes[[1]]
cat(e$handout())
#> ## Challenge 1: Can you do it?
#> 
#> What is the output of this command?
#> 
#> ```{r, eval=FALSE}
#> paste("This", "new", "template", "looks", "good")
#> ```
cat(e$handout(solution = TRUE))
#> ## Challenge 1: Can you do it?
#> 
#> What is the output of this command?
#> 
#> ```{r, eval=FALSE}
#> paste("This", "new", "template", "looks", "good")
#> ```
#> 
#> :::::::::::::::::::::::: solution
#> 
#> ## Output
#> 
#> ```{r, echo=FALSE}
#> paste("This", "new", "template", "looks", "good")
#> ```
#> 
#> ::::::::::::::::::::::::::::::::::
#> 
#> ## Challenge 2: how do you nest solutions within challenge blocks?
#> 
#> :::::::::::::::::::::::: solution
#> 
#> You can add a line with at least three colons and a `solution` tag.

## ------------------------------------------------
## Method `Episode$reset`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
xml2::xml_text(scope$tags[1])
#> [1] "{: .language-python}"
xml2::xml_set_text(scope$tags[1], "{: .code}")
#> {xml_nodeset (1)}
#> [1]  ktag="{: .language-python}"
xml2::xml_text(scope$tags[1])
#> [1] "{: .language-python}"
scope$reset()
xml2::xml_text(scope$tags[1])
#> [1] "{: .language-python}"

## ------------------------------------------------
## Method `Episode$isolate_blocks`
## ------------------------------------------------

scope <- Episode$new(file.path(lesson_fragment(), "_episodes", "17-scope.md"))
scope$body # a full document with block quotes and code blocks, etc
#> {xml_document}
#> <document sourcepos="1:1-95:14" xmlns="http://commonmark.org/xml/1.0">
#> [1] <heading sourcepos="1:1-1:81" level="2">\n  <text sourcepos="1:4-1:81" xm ...
#> [2] <list sourcepos="3:1-9:0" type="bullet" tight="true">\n  <item sourcepos= ...
#> [3] <code_block sourcepos="10:1-16:3" xml:space="preserve" name="" ktag="{: . ...
#> [4] <list sourcepos="19:1-27:0" type="bullet" tight="true">\n  <item sourcepo ...
#> [5] <code_block sourcepos="28:1-31:3" xml:space="preserve" name="" ktag="{: . ...
#> [6] <code_block sourcepos="33:1-35:3" xml:space="preserve" name="" ktag="{: . ...
#> [7] <code_block sourcepos="37:1-42:3" xml:space="preserve" name="" ktag="{: . ...
#> [8] <block_quote sourcepos="45:1-60:14" ktag="{: .challenge}">\n  <heading so ...
#> [9] <block_quote sourcepos="62:1-95:14" ktag="{: .challenge}">\n  <heading so ...
scope$isolate_blocks()$body # only one challenge block_quote
#> {xml_document}
#> <document sourcepos="1:1-95:14" xmlns="http://commonmark.org/xml/1.0">
#> [1] <block_quote sourcepos="45:1-60:14" ktag="{: .challenge}">\n  <heading so ...
#> [2] <block_quote sourcepos="62:1-95:14" ktag="{: .challenge}">\n  <heading so ...

## ------------------------------------------------
## Method `Episode$unblock`
## ------------------------------------------------

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$body # a full document with block quotes and code blocks, etc
#> {xml_document}
#> <document sourcepos="1:1-190:22" xmlns="http://commonmark.org/xml/1.0">
#>  [1] <heading sourcepos="2:1-2:65" level="2">\n  <text sourcepos="2:4-2:9" xm ...
#>  [2] <list sourcepos="4:1-6:0" type="bullet" tight="true">\n  <item sourcepos ...
#>  [3] <code_block sourcepos="7:1-12:3" xml:space="preserve" name="" ktag="{: . ...
#>  [4] <code_block sourcepos="14:1-33:3" xml:space="preserve" name="" ktag="{:  ...
#>  [5] <heading sourcepos="36:1-36:126" level="2">\n  <text sourcepos="36:4-36: ...
#>  [6] <list sourcepos="38:1-47:0" type="bullet" tight="true">\n  <item sourcep ...
#>  [7] <code_block sourcepos="48:1-51:3" xml:space="preserve" name="" ktag="{:  ...
#>  [8] <code_block sourcepos="53:1-57:3" xml:space="preserve" name="" ktag="{:  ...
#>  [9] <code_block sourcepos="60:1-62:3" xml:space="preserve" name="" ktag="{:  ...
#> [10] <code_block sourcepos="64:1-66:3" xml:space="preserve" name="" ktag="{:  ...
#> [11] <heading sourcepos="69:1-69:52" level="2">\n  <text sourcepos="69:4-69:7 ...
#> [12] <list sourcepos="71:1-73:0" type="bullet" tight="true">\n  <item sourcep ...
#> [13] <code_block sourcepos="74:1-78:3" xml:space="preserve" name="" ktag="{:  ...
#> [14] <code_block sourcepos="80:1-87:3" xml:space="preserve" name="" ktag="{:  ...
#> [15] <list sourcepos="90:1-94:0" type="bullet" tight="true">\n  <item sourcep ...
#> [16] <block_quote sourcepos="95:1-108:14" ktag="{: .challenge}">\n  <heading  ...
#> [17] <block_quote sourcepos="110:1-140:14" ktag="{: .challenge}">\n  <heading ...
#> [18] <block_quote sourcepos="142:1-170:14" ktag="{: .challenge}">\n  <heading ...
#> [19] <heading sourcepos="172:1-172:29" level="3">\n  <text sourcepos="172:5-1 ...
#> [20] <html_block sourcepos="174:1-174:86" xml:space="preserve">&lt;img src="h ...
#> ...
loop$get_blocks() # all the blocks in the episode
#> {xml_nodeset (3)}
#> [1] <block_quote sourcepos="95:1-108:14" ktag="{: .challenge}">\n  <heading s ...
#> [2] <block_quote sourcepos="110:1-140:14" ktag="{: .challenge}">\n  <heading  ...
#> [3] <block_quote sourcepos="142:1-170:14" ktag="{: .challenge}">\n  <heading  ...
loop$unblock()
loop$get_blocks() # no blocks
#> {xml_nodeset (0)}
loop$code # now there are two blocks with challenge tags
#> {xml_nodeset (11)}
#>  [1] <code_block sourcepos="7:1-12:3" xml:space="preserve" name="" ktag="{: . ...
#>  [2] <code_block sourcepos="14:1-33:3" xml:space="preserve" name="" ktag="{:  ...
#>  [3] <code_block sourcepos="48:1-51:3" xml:space="preserve" name="" ktag="{:  ...
#>  [4] <code_block sourcepos="53:1-57:3" xml:space="preserve" name="" ktag="{:  ...
#>  [5] <code_block sourcepos="60:1-62:3" xml:space="preserve" name="" ktag="{:  ...
#>  [6] <code_block sourcepos="64:1-66:3" xml:space="preserve" name="" ktag="{:  ...
#>  [7] <code_block sourcepos="74:1-78:3" xml:space="preserve" name="" ktag="{:  ...
#>  [8] <code_block sourcepos="80:1-87:3" xml:space="preserve" name="" ktag="{:  ...
#>  [9] <code_block sourcepos="115:3-123:5" xml:space="preserve" name="" ktag="{ ...
#> [10] <code_block sourcepos="129:5-137:7" xml:space="preserve" name="" ktag="{ ...
#> [11] <code_block sourcepos="152:5-167:7" xml:space="preserve" name="" ktag="{ ...

## ------------------------------------------------
## Method `Episode$validate_headings`
## ------------------------------------------------

# Example: There are multiple headings called "Solution" that are not
# nested within a higher-level heading and will throw an error
loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_headings()
#> ! There were errors in 3/10 headings
#> ◌ Headings must be unique
#> <https://webaim.org/techniques/semanticstructure/#headings>
#> 
#> ::warning file=_episodes/14-looping-data-sets.md,line=119:: (duplicated)
#> ::warning file=_episodes/14-looping-data-sets.md,line=143:: (duplicated)
#> ::warning file=_episodes/14-looping-data-sets.md,line=162:: (duplicated)
#> ── Heading structure ───────────────────────────────────────────────────────────
#> # Episode: “Looping Over Data Sets” 
#> ├─## Use a for loop to process files given a list of their names. 
#> ├─## Use glob.glob to find sets of files whose names match a pattern. 
#> ├─## Use glob and for to process batches of files. 
#> ├─## Determining Matches 
#> ├─## Solution  (duplicated)
#> ├─## Minimum File Size 
#> ├─## Solution  (duplicated)
#> ├─## Comparing Data 
#> └─## Solution  (duplicated)
#>   └─### ZNK test links and images 
#> ────────────────────────────────────────────────────────────────────────────────

## ------------------------------------------------
## Method `Episode$validate_divs`
## ------------------------------------------------

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_divs()

## ------------------------------------------------
## Method `Episode$validate_links`
## ------------------------------------------------

loop <- Episode$new(file.path(lesson_fragment(), "_episodes", "14-looping-data-sets.md"))
loop$validate_links()
#> ! There were errors in 4/13 images
#> ◌ Some linked internal files do not exist <https://carpentries.github.io/sandpaper/articles/include-child-documents.html#workspace-consideration>
#> ◌ Images need alt-text <https://webaim.org/techniques/hypertext/link_text#alt_link>
#> 
#> ::warning file=_episodes/14-looping-data-sets.md,line=191:: [missing file]: [](../no-workie.svg)
#> ::warning file=_episodes/14-looping-data-sets.md,line=195:: [image missing alt-text]: https://carpentries.org/assets/img/TheCarpentries.svg
#> ::warning file=_episodes/14-looping-data-sets.md,line=197:: [missing file]: [Non-working image](../no-workie.svg) [image missing alt-text]: ../no-workie.svg
#> ::warning file=_episodes/14-looping-data-sets.md,line=199:: [image missing alt-text]: { page.root }/no-workie.svg

Class representing XML source of a Carpentries episode

Details

Note

Super class

Public fields

Active bindings

Methods

Public methods

Method new()

Usage

Arguments

Returns

Examples

Method confirm_sandpaper()

Usage

Method get_blocks()

Usage

Arguments

Returns

Examples

Method get_images()

Usage

Arguments

Returns

Examples

Method label_divs()

Usage

Method get_divs()

Usage

Arguments

Method get_yaml()

Usage

Method use_dovetail()

Usage

Method use_sandpaper()

Usage

Arguments

Method remove_error()

Usage

Method remove_output()

Usage

Method move_objectives()

Usage

Method move_keypoints()

Usage

Method move_questions()

Usage

Method get_challenge_graph()

Usage

Arguments

Returns

Examples

Method show()

Usage

Arguments

Returns

Examples

Method head()

Usage

Arguments

Returns

Method tail()

Usage

Arguments

Returns

Method write()

Usage

Arguments

Returns

Examples

Method handout()

Usage

Arguments

Returns

Examples

Method reset()

Usage

Returns

Examples

Method isolate_blocks()

Method `new()`

Method `confirm_sandpaper()`

Method `get_blocks()`

Method `get_images()`

Method `label_divs()`

Method `get_divs()`

Method `get_yaml()`

Method `use_dovetail()`

Method `use_sandpaper()`

Method `remove_error()`

Method `remove_output()`

Method `move_objectives()`

Method `move_keypoints()`

Method `move_questions()`

Method `get_challenge_graph()`

Method `show()`

Method `head()`

Method `tail()`

Method `write()`

Method `handout()`

Method `reset()`

Method `isolate_blocks()`

Method `unblock()`

Method `summary()`

Method `validate_headings()`

Method `validate_divs()`

Method `validate_links()`

Method `clone()`