overleaf/services/web/frontend/js/features/source-editor/commands/ranges.ts

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import { EditorView } from '@codemirror/view'
import {
EditorSelection,
EditorState,
SelectionRange,
TransactionSpec,
} from '@codemirror/state'
import {
ensureSyntaxTree,
foldedRanges,
foldEffect,
syntaxTree,
} from '@codemirror/language'
import { SyntaxNode } from '@lezer/common'
import {
ancestorOfNodeWithType,
isUnknownCommandWithName,
} from '../utils/tree-query'
import { lastAncestorAtEndPosition } from '../utils/tree-operations/ancestors'
export const wrapRanges =
(
prefix: string,
suffix: string,
wrapWholeLine = false,
selection?: (range: SelectionRange, view: EditorView) => SelectionRange
) =>
(view: EditorView): boolean => {
if (view.state.readOnly) {
return false
}
view.dispatch(
view.state.changeByRange(range => {
const insert = { prefix, suffix }
if (wrapWholeLine) {
const line = view.state.doc.lineAt(range.anchor)
if (range.empty) {
// expand range to cover the whole line
range = EditorSelection.range(line.from, line.to)
}
// add a newline at the start if needed
if (range.from !== line.from) {
insert.prefix = `\n${prefix}`
}
// add a newline at the end if needed
if (range.to !== line.to) {
insert.suffix = `${suffix}\n`
}
}
const content = view.state.sliceDoc(range.from, range.to)
// map through the prefix only
const changedRange = range.map(
view.state.changes([
{ from: range.from, insert: `${insert.prefix}` },
]),
1
)
return {
range: selection ? selection(changedRange, view) : changedRange,
// create a single change, including the content
changes: [
{
from: range.from,
to: range.to,
insert: `${insert.prefix}${content}${insert.suffix}`,
},
],
}
}),
{ scrollIntoView: true }
)
return true
}
export const changeCase =
(upper = true) =>
(view: EditorView) => {
if (view.state.readOnly) {
return false
}
view.dispatch(
view.state.changeByRange(range => {
// ignore empty ranges
if (range.empty) {
return { range }
}
const text = view.state.doc.sliceString(range.from, range.to)
return {
range,
changes: [
{
from: range.from,
to: range.to,
insert: upper ? text.toUpperCase() : text.toLowerCase(),
},
],
}
})
)
return true
}
export const duplicateSelection = (view: EditorView) => {
if (view.state.readOnly) {
return false
}
const foldedRangesInDocument = foldedRanges(view.state)
view.dispatch(
view.state.changeByRange(range => {
const folds: { offset: number; base: number; length: number }[] = []
if (range.empty) {
const line = view.state.doc.lineAt(range.from)
let lineStart = line.from
let lineEnd = line.to
// Calculate line start/end including folded ranges
//
// Note that at each iteration of the while loop, new folded ranges
// can be included. This happens when there are multiple folded ranges
// on a single editor line (but spanning multiple actual lines)
//
// For example, the following document:
// 1: \begin{document}
// 2: test
// 3: \end{document}\begin{document}
// 4: test
// 5: \end{document}
//
// Can be folded to:
// \begin{document}<...>\end{document}\begin{document}<...>\end{document}
//
// In this case, the first iterations of the while loop below will only
// include lines 3-5, since the overlapping folded range for line 5
// is only the fold on lines 3-5. Hence in the while loop, we expand the
// selection until we include all the ranges.
let changed
do {
changed = false
foldedRangesInDocument.between(lineStart, lineEnd, (from, to) => {
const newLineStart = Math.min(
view.state.doc.lineAt(from).from,
lineStart
)
const newLineEnd = Math.max(view.state.doc.lineAt(to).to, lineEnd)
if (newLineStart !== lineStart || newLineEnd !== lineEnd) {
changed = true
lineStart = newLineStart
lineEnd = newLineEnd
}
})
} while (changed)
// Collect information needed to fold duplicated lines
foldedRangesInDocument.between(lineStart, lineEnd, (from, to) => {
folds.push({
offset: from - lineStart,
base: lineEnd + view.state.lineBreak.length,
length: to - from,
})
})
// Duplicate the selected lines downwards
return {
range,
changes: [
{
from: lineEnd,
insert:
view.state.lineBreak + view.state.doc.slice(lineStart, lineEnd),
},
],
// Add a fold effect for each fold in the original line
effects: folds.map(fold =>
foldEffect.of({
from: fold.base + fold.offset,
to: fold.base + fold.offset + fold.length,
})
),
}
} else {
// Duplicate selected text at head of selection
let newSelectionRange = range
if (range.head > range.anchor) {
// Duplicating to the right, so we need to update the selected range
newSelectionRange = EditorSelection.range(
range.head,
range.head + (range.to - range.from)
)
}
return {
// The new range is the duplicated section, placed at the head of the
// original selection
range: newSelectionRange,
changes: [
{
from: range.head,
insert: view.state.doc.slice(range.from, range.to),
},
],
}
}
})
)
return true
}
function getParentNode(
position: number | SyntaxNode,
state: EditorState,
assoc: 0 | 1 | -1 = 1
): SyntaxNode | undefined {
const tree = ensureSyntaxTree(state, 1000)
let node: SyntaxNode | undefined | null = null
if (typeof position === 'number') {
node = tree?.resolveInner(position, assoc)?.parent
const ancestorAtEndPos = lastAncestorAtEndPosition(node, position)
if (ancestorAtEndPos?.parent) {
node = ancestorAtEndPos.parent
}
} else {
node = position?.parent
}
while (
['LongArg', 'TextArgument', 'OpenBrace', 'CloseBrace'].includes(
node?.type.name || ''
)
) {
node = node!.parent
}
return node || undefined
}
function wrapRangeInCommand(
state: EditorState,
range: SelectionRange,
command: string
) {
const content = state.sliceDoc(range.from, range.to)
const changes = state.changes([
{
from: range.from,
to: range.to,
insert: `${command}{${content}}`,
},
])
return {
changes,
range: moveRange(
range,
range.from + command.length + 1,
range.from + command.length + content.length + 1
),
}
}
function moveRange(range: SelectionRange, newFrom: number, newTo: number) {
const forwards = range.from === range.anchor
return forwards
? EditorSelection.range(newFrom, newTo)
: EditorSelection.range(newTo, newFrom)
}
function validateReplacement(expected: string, actual: string) {
if (expected !== actual) {
throw new Error('Replacement in toggleRange failed validation.')
}
}
function getWrappingAncestor(
node: SyntaxNode,
command: string,
state: EditorState
): SyntaxNode | null {
for (
let ancestor: SyntaxNode | null = node;
ancestor;
ancestor = ancestor.parent
) {
if (isUnknownCommandWithName(ancestor, command, state)) {
return ancestor
}
if (ancestor.type.is('UnknownCommand')) {
// We could multiple levels deep in bold/non-bold. So bail out in this case
return null
}
}
return null
}
function adjustRangeIfNeeded(
command: string,
range: SelectionRange,
state: EditorState
) {
// Try to adjust the selection, if it is either
// 1. \textbf<{test>}
// 2. \textbf{<test}>
// 3. \textbf<{test}>
// 4. <\textbf{test}>
// 4. \textbf<>{test}
const tree = syntaxTree(state)
if (tree.length < range.to) {
return range
}
const nodeLeft = tree.resolveInner(range.from, 1)
const nodeRight = tree.resolveInner(range.to, -1)
const parentLeft = getWrappingAncestor(nodeLeft, command, state)
const parentRight = getWrappingAncestor(nodeRight, command, state)
const parent = getParentNode(nodeLeft, state)
if (parent?.type.is('UnknownCommand') && spansWholeArgument(parent, range)) {
return bubbleUpRange(
command,
ancestorOfNodeWithType(nodeLeft, 'UnknownCommand'),
range,
state
)
}
if (!parentLeft) {
// We're not trying to unbold, so don't bother adjusting range
return bubbleUpRange(
command,
ancestorOfNodeWithType(nodeLeft, 'UnknownCommand'),
range,
state
)
}
if (nodeLeft.type.is('CtrlSeq') && range.from === range.to) {
const command = nodeLeft.parent?.parent
if (!command) {
return range
}
return EditorSelection.cursor(command.from)
}
let { from, to } = range
if (nodeLeft.type.is('CtrlSeq')) {
from = nodeLeft.to + 1
}
if (nodeLeft.type.is('OpenBrace')) {
from = nodeLeft.to
}
// We know that parentLeft is the UnknownCommand, so now we check if we're
// to the right of the closing brace. (parent is TextArgument, grandparent is
// UnknownCommand)
if (parentLeft === parentRight && nodeRight.type.is('CloseBrace')) {
to = nodeRight.from
}
return bubbleUpRange(command, parentLeft, moveRange(range, from, to), state)
}
function spansWholeArgument(
commandNode: SyntaxNode | null,
range: SelectionRange
): boolean {
const argument = commandNode?.getChild('TextArgument')?.getChild('LongArg')
const res = Boolean(
argument && argument.from === range.from && argument.to === range.to
)
return res
}
function bubbleUpRange(
command: string,
node: SyntaxNode | null,
range: SelectionRange,
state: EditorState
) {
let currentRange = range
for (
let ancestorCommand: SyntaxNode | null = ancestorOfNodeWithType(
node,
'UnknownCommand'
);
spansWholeArgument(ancestorCommand, currentRange);
ancestorCommand = ancestorOfNodeWithType(
ancestorCommand.parent,
'UnknownCommand'
)
) {
if (!ancestorCommand) {
break
}
currentRange = moveRange(
currentRange,
ancestorCommand.from,
ancestorCommand.to
)
if (isUnknownCommandWithName(ancestorCommand, command, state)) {
const argumentNode = ancestorCommand
.getChild('TextArgument')
?.getChild('LongArg')
if (!argumentNode) {
return range
}
return moveRange(range, argumentNode.from, argumentNode.to)
}
}
return range
}
export function toggleRanges(
command: string,
annotations?: TransactionSpec['annotations']
) {
/* There are a number of situations we need to handle in this function.
* In the following examples, the selection range is marked within <>
* 1. If the parent node at start and end of selection is different -> do
* nothing & show error. Case 8 is an exception to this.
* -> For good and bad, this disallows \textbf{this <is} weird
* \textit{to> do}
* 2. If selection contains a BlankLine (i.e. two newlines in a row) -> do
* nothing & show error
* -> \textbf doesn't allow paragraph breaks).
* 3. If the selection is not within a \textbf -> wrap it in a \textbf
* 4. If selection is at the beginning of a \textbf -> shrink the \textbf
* command
* -> e.g. \textbf{<this is> a test} <this is>\textbf{ a test}
* 5. Similarly for selection at end of \textbf command
* 6. If selection is in the middle of a \textbf command -> split the command
* into two
* -> e.g. \textbf{this <is a> test} \textbf{this }<is a>\textbf{ test}
* 7. If the selection is a whole \textbf command remove the wrapping
* command.
* 8. If the selection spans two \textbf's with the same parent then join the
* two
* -> e.g. \textbf{this <is} a \textbf{te>st} \textbf{this <is a te>st}
* 9. If the selection spans the end of a \textbf, into the parent of the
* command, then extend the \textbf.
* -> e.g. \textbf{this <is} a test> \textbf{this <is a test>}
* 10. Similarly for selections spanning the beginning of the selection
*/
return (view: EditorView): boolean => {
if (view.state.readOnly) {
return false
}
view.dispatch(
view.state.changeByRange(initialRange => {
const range = adjustRangeIfNeeded(command, initialRange, view.state)
const content = view.state.sliceDoc(range.from, range.to)
const ancestorAtStartOfRange = getParentNode(
range.from,
view.state,
range.from === 0 ? 1 : -1
)
const ancestorAtEndOfRange = range.empty
? ancestorAtStartOfRange
: getParentNode(
range.to,
view.state,
range.to === view.state.doc.length ? -1 : 1
)
const tree = ensureSyntaxTree(view.state, 1000)
const nodeAtFrom = tree?.resolveInner(range.from, 1)
const nodeAtTo = tree?.resolveInner(range.to, -1)
const isSingleNodeSelected = nodeAtFrom === nodeAtTo
if (
!isSingleNodeSelected &&
ancestorAtStartOfRange !== ancestorAtEndOfRange
) {
// But handle the exception of case 8
const ancestorAtStartIsWrappingCommand =
ancestorAtStartOfRange &&
isUnknownCommandWithName(
ancestorAtStartOfRange,
command,
view.state
)
const ancestorAtEndIsWrappingCommand =
ancestorAtEndOfRange &&
isUnknownCommandWithName(ancestorAtEndOfRange, command, view.state)
if (
ancestorAtStartIsWrappingCommand &&
ancestorAtEndIsWrappingCommand &&
ancestorAtStartOfRange?.parent?.parent &&
ancestorAtEndOfRange?.parent?.parent
) {
// Test for case 8
const nextAncestorAtStartOfRange =
ancestorAtStartOfRange.parent.parent
const nextAncestorAtEndOfRange = ancestorAtEndOfRange.parent.parent
if (nextAncestorAtStartOfRange === nextAncestorAtEndOfRange) {
// Join the two ranges
const textBetweenRanges = view.state.sliceDoc(
ancestorAtStartOfRange.to,
ancestorAtEndOfRange.from
)
const ancestorStartArgumentNode =
ancestorAtStartOfRange.lastChild?.getChild('LongArg')
const ancestorEndArgumentNode =
ancestorAtEndOfRange.lastChild?.getChild('LongArg')
if (!ancestorStartArgumentNode || !ancestorEndArgumentNode) {
throw new Error("Can't find argument node")
}
const actualContent = view.state.sliceDoc(
ancestorAtStartOfRange.from,
ancestorAtEndOfRange.to
)
const firstCommandArgument = view.state.sliceDoc(
ancestorStartArgumentNode.from,
ancestorStartArgumentNode.to
)
const secondCommandArgument = view.state.sliceDoc(
ancestorEndArgumentNode.from,
ancestorEndArgumentNode.to
)
validateReplacement(
`${command}{${firstCommandArgument}}${textBetweenRanges}${command}{${secondCommandArgument}}`,
actualContent
)
const changes = view.state.changes([
{
from: ancestorAtStartOfRange.from,
to: ancestorAtEndOfRange.to,
insert: `${command}{${firstCommandArgument}${textBetweenRanges}${secondCommandArgument}}`,
},
])
return {
changes,
range: moveRange(
range,
range.from,
range.to - command.length - 1 - 1
),
}
}
}
if (
ancestorAtEndIsWrappingCommand &&
ancestorAtEndOfRange.parent?.parent === ancestorAtStartOfRange
) {
// Extend to the left. Case 10
const contentUpToCommand = view.state.sliceDoc(
range.from,
ancestorAtEndOfRange.from
)
const ancestorEndArgumentNode =
ancestorAtEndOfRange.lastChild?.getChild('LongArg')
if (!ancestorEndArgumentNode) {
throw new Error("Can't find argument node")
}
const commandContent = view.state.sliceDoc(
ancestorEndArgumentNode.from,
ancestorEndArgumentNode.to
)
const actualContent = view.state.sliceDoc(
range.from,
ancestorAtEndOfRange.to
)
validateReplacement(
`${contentUpToCommand}${command}{${commandContent}}`,
actualContent
)
const changes = view.state.changes([
{
from: range.from,
to: ancestorAtEndOfRange.to,
insert: `${command}{${contentUpToCommand}${commandContent}}`,
},
])
return {
changes,
range: moveRange(
range,
range.from + command.length + 1,
range.to
),
}
}
if (
ancestorAtStartIsWrappingCommand &&
ancestorAtStartOfRange.parent?.parent === ancestorAtEndOfRange
) {
// Extend to the right. Case 9
const contentAfterCommand = view.state.sliceDoc(
ancestorAtStartOfRange.to,
range.to
)
const ancestorStartArgumentNode =
ancestorAtStartOfRange.lastChild?.getChild('LongArg')
if (!ancestorStartArgumentNode) {
throw new Error("Can't find argument node")
}
const commandContent = view.state.sliceDoc(
ancestorStartArgumentNode.from,
ancestorStartArgumentNode.to
)
const actualContent = view.state.sliceDoc(
ancestorAtStartOfRange.from,
range.to
)
validateReplacement(
`${command}{${commandContent}}${contentAfterCommand}`,
actualContent
)
const changes = view.state.changes([
{
from: ancestorAtStartOfRange.from,
to: range.to,
insert: `${command}{${commandContent}${contentAfterCommand}}`,
},
])
return {
changes,
range: moveRange(range, range.from, range.to - 1),
}
}
// Bail out in case 1
// TODO: signal error to the user
return { range }
}
const ancestor = ancestorAtStartOfRange
// Bail out in case 2
if (content.includes('\n\n')) {
// TODO: signal error to the user
return { range }
}
const isCursorBeforeAncestor =
range.empty &&
ancestor &&
range.from === ancestor.from &&
isUnknownCommandWithName(ancestor, command, view.state)
// If we can't find an ancestor node, or if the parent is not an exsting
// \textbf, then we just wrap it in a range. Case 3.
if (
isCursorBeforeAncestor ||
!ancestor ||
!isUnknownCommandWithName(ancestor, command, view.state)
) {
return wrapRangeInCommand(view.state, range, command)
}
const argumentNode = ancestor.lastChild?.getChild('LongArg')
if (!argumentNode) {
throw new Error("Can't find argument node")
}
// We should trim from the beginning. Case 4
if (range.from === argumentNode.from && range.to !== argumentNode.to) {
const textAfterSelection = view.state.sliceDoc(
range.to,
argumentNode.to
)
const wholeCommand = view.state.sliceDoc(ancestor.from, ancestor.to)
validateReplacement(
`${command}{${content}${textAfterSelection}}`,
wholeCommand
)
const changes = view.state.changes([
{
from: ancestor.from,
to: ancestor.to,
insert: `${content}${command}{${textAfterSelection}}`,
},
])
return {
range: moveRange(
range,
range.from - command.length - 1,
range.to - command.length - 1
),
changes,
}
}
// We should trim from the end. Case 5
if (range.to === argumentNode.to && range.from !== argumentNode.from) {
const textBeforeSelection = view.state.sliceDoc(
ancestor.from,
range.from
)
const wholeCommand = view.state.sliceDoc(ancestor.from, ancestor.to)
validateReplacement(`${textBeforeSelection}${content}}`, wholeCommand)
const changes = view.state.changes([
{
from: ancestor.from,
to: ancestor.to,
insert: `${textBeforeSelection}}${content}`,
},
])
// We should shift selection forward by the } we insert
return {
range: moveRange(range, range.from + 1, range.to + 1),
changes,
}
}
// We should split the command in two. Case 6
if (range.from !== argumentNode.from && range.to !== argumentNode.to) {
const textBeforeSelection = view.state.sliceDoc(
ancestor.from,
range.from
)
const textAfterSelection = view.state.sliceDoc(range.to, ancestor.to)
const wholeCommand = view.state.sliceDoc(ancestor.from, ancestor.to)
validateReplacement(
`${textBeforeSelection}${content}${textAfterSelection}`,
wholeCommand
)
const changes = view.state.changes([
{
from: ancestor.from,
to: ancestor.to,
insert: `${textBeforeSelection}}${content}${command}{${textAfterSelection}`,
},
])
return {
range: moveRange(range, range.from + 1, range.to + 1),
changes,
}
}
// Remove the wrapping command. Case 7
if (spansWholeArgument(ancestor, range)) {
const argumentContent = view.state.sliceDoc(
argumentNode.from,
argumentNode.to
)
const wholeCommand = view.state.sliceDoc(ancestor.from, ancestor.to)
validateReplacement(`${command}{${content}}`, wholeCommand)
const changes = view.state.changes([
{ from: ancestor.from, to: ancestor.to, insert: argumentContent },
])
return {
range: moveRange(
range,
range.from - command.length - 1,
range.to - command.length - 1
),
changes,
}
}
// Shouldn't happen, but default to just wrapping the content
return wrapRangeInCommand(view.state, range, command)
}),
{ scrollIntoView: true, annotations }
)
return true
}
}