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https://github.com/nushell/nushell
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206 lines
7.8 KiB
Text
206 lines
7.8 KiB
Text
# Utility functions to read, change and create XML data in format supported
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# by `to xml` and `from xml` commands
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# Get all xml entries matching simple xpath-inspired query
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export def xaccess [
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path: list # List of steps. Each step can be a
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# 1. String with tag name. Finds all children with specified name. Equivalent to `child::A` in xpath
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# 2. `*` string. Get all children without any filter. Equivalent to `descendant` in xpath
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# 3. Int. Select n-th among nodes selected by previous path. Equivalent to `(...)[1]` in xpath, but is indexed from 0.
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# 4. Closure. Predicate accepting entry. Selects all entries among nodes selected by previous path for which predicate returns true.
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] {
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let input = $in
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if ($path | is-empty) {
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let path_span = (metadata $path).span
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error make {msg: 'Empty path provided'
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label: {text: 'Use a non-empty list of path steps'
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start: $path_span.start end: $path_span.end}}
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}
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# In xpath first element in path is applied to root element
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# this way it is possible to apply first step to root element
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# of nu xml without unrolling one step of loop
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mut values = ()
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$values = {content: [ { content: $input } ] }
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for $step in ($path) {
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match ($step | describe) {
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'string' => {
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if $step == '*' {
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$values = ($values.content | flatten)
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} else {
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$values = ($values.content | flatten | where tag == $step)
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}
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},
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'int' => {
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$values = [ ($values | get $step) ]
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},
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'closure' => {
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$values = ($values | where {|x| do $step $x})
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},
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$type => {
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let step_span = (metadata $step).span
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error make {msg: $'Incorrect path step type ($type)'
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label: {text: 'Use a string or int as a step'
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start: $step_span.start end: $step_span.end}}
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}
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}
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if ($values | is-empty) {
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return []
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}
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}
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$values
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}
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def xupdate-string-step [ step: string rest: list updater: closure ] {
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let input = $in
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# Get a list of elements to be updated and their indices
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let to_update = ($input.content | enumerate | filter {|it|
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let item = $it.item
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$step == '*' or $item.tag == $step
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})
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if ($to_update | is-empty) {
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return $input
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}
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let new_values = ($to_update.item | xupdate-internal $rest $updater)
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mut reenumerated_new_values = ($to_update.index | zip $new_values | each {|x| {index: $x.0 item: $x.1}})
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mut new_content = []
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for it in ($input.content | enumerate) {
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let item = $it.item
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let idx = $it.index
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let next = (if (not ($reenumerated_new_values | is-empty)) and $idx == $reenumerated_new_values.0.index {
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let tmp = $reenumerated_new_values.0
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$reenumerated_new_values = ($reenumerated_new_values | skip 1)
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$tmp.item
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} else {
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$item
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})
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$new_content = ($new_content | append $next)
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}
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{tag: $input.tag attributes: $input.attributes content: $new_content}
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}
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def xupdate-int-step [ step: int rest: list updater: closure ] {
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$in | enumerate | each {|it|
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let item = $it.item
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let idx = $it.index
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if $idx == $step {
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[ $item ] | xupdate-internal $rest $updater | get 0
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} else {
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$item
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}
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}
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}
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def xupdate-closure-step [ step: closure rest: list updater: closure ] {
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$in | each {|it|
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if (do $step $it) {
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[ $it ] | xupdate-internal $rest $updater | get 0
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} else {
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$it
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}
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}
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}
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def xupdate-internal [ path: list updater: closure ] {
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let input = $in
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if ($path | is-empty) {
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$input | each $updater
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} else {
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let step = $path.0
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let rest = ($path | skip 1)
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match ($step | describe) {
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'string' => {
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$input | each {|x| $x | xupdate-string-step $step $rest $updater}
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},
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'int' => {
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$input | xupdate-int-step $step $rest $updater
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},
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'closure' => {
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$input | xupdate-closure-step $step $rest $updater
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},
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$type => {
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let step_span = (metadata $step).span
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error make {msg: $'Incorrect path step type ($type)'
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label: {text: 'Use a string or int as a step'
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start: $step_span.start end: $step_span.end}}
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}
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}
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}
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}
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# Update xml data entries matching simple xpath-inspired query
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export def xupdate [
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path: list # List of steps. Each step can be a
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# 1. String with tag name. Finds all children with specified name. Equivalent to `child::A` in xpath
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# 2. `*` string. Get all children without any filter. Equivalent to `descendant` in xpath
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# 3. Int. Select n-th among nodes selected by previous path. Equivalent to `(...)[1]` in xpath, but is indexed from 0.
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# 4. Closure. Predicate accepting entry. Selects all entries among nodes selected by previous path for which predicate returns true.
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updater: closure # A closure used to transform entries matching path.
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] {
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{tag:? attributes:? content: [$in]} | xupdate-internal $path $updater | get content.0
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}
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# Get type of an xml entry
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#
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# Possible types are 'tag', 'text', 'pi' and 'comment'
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export def xtype [] {
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let input = $in
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if (($input | describe) == 'string' or
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($input.tag? == null and $input.attributes? == null and ($input.content? | describe) == 'string')) {
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'text'
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} else if $input.tag? == '!' {
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'comment'
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} else if $input.tag? != null and ($input.tag? | str starts-with '?') {
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'pi'
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} else if $input.tag? != null {
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'tag'
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} else {
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error make {msg: 'Not an xml emtry. Check valid types of xml entries via `help to xml`'}
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}
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}
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# Insert new entry to elements matching simple xpath-inspired query
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export def xinsert [
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path: list # List of steps. Each step can be a
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# 1. String with tag name. Finds all children with specified name. Equivalent to `child::A` in xpath
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# 2. `*` string. Get all children without any filter. Equivalent to `descendant` in xpath
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# 3. Int. Select n-th among nodes selected by previous path. Equivalent to `(...)[1]` in xpath, but is indexed from 0.
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# 4. Closure. Predicate accepting entry. Selects all entries among nodes selected by previous path for which predicate returns true.
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new_entry: record # A new entry to insert into `content` field of record at specified position
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position?: int # Position to insert `new_entry` into. If specified inserts entry at given position (or end if
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# position is greater than number of elements) in content of all entries of input matched by
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# path. If not specified inserts at the end.
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] {
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$in | xupdate $path {|entry|
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match ($entry | xtype) {
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'tag' => {
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let new_content = if $position == null {
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$entry.content | append $new_entry
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} else {
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let position = if $position > ($entry.content | length) {
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$entry.content | length
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} else {
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$position
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}
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$entry.content | insert $position $new_entry
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}
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{tag: $entry.tag attributes: $entry.attributes content: $new_content}
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},
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_ => (error make {msg: 'Can insert entry only into content of a tag node'})
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}
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}
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}
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