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export class EditorMarkdownExtension {
static get extensionName() {
return 'EditorMarkdown';
}
// eslint-disable-next-line class-methods-use-this
provides() {
return {
getSelectedText: (instance, selection = instance.getSelection()) => {
const { startLineNumber, endLineNumber, startColumn, endColumn } = selection;
const valArray = instance.getValue().split('\n');
let text = '';
if (startLineNumber === endLineNumber) {
text = valArray[startLineNumber - 1].slice(startColumn - 1, endColumn - 1);
} else {
const startLineText = valArray[startLineNumber - 1].slice(startColumn - 1);
const endLineText = valArray[endLineNumber - 1].slice(0, endColumn - 1);
for (let i = startLineNumber, k = endLineNumber - 1; i < k; i += 1) {
text += `${valArray[i]}`;
if (i !== k - 1) text += `\n`;
}
text = text
? [startLineText, text, endLineText].join('\n')
: [startLineText, endLineText].join('\n');
}
return text;
},
replaceSelectedText: (instance, text, select) => {
const forceMoveMarkers = !select;
instance.executeEdits('', [{ range: instance.getSelection(), text, forceMoveMarkers }]);
},
moveCursor: (instance, dx = 0, dy = 0) => {
const pos = instance.getPosition();
pos.column += dx;
pos.lineNumber += dy;
instance.setPosition(pos);
},
/**
* Adjust existing selection to select text within the original selection.
* - If `selectedText` is not supplied, we fetch selected text with
*
* ALGORITHM:
*
* MULTI-LINE SELECTION
* 1. Find line that contains `toSelect` text.
* 2. Using the index of this line and the position of `toSelect` text in it,
* construct:
* * newStartLineNumber
* * newStartColumn
*
* SINGLE-LINE SELECTION
* 1. Use `startLineNumber` from the current selection as `newStartLineNumber`
* 2. Find the position of `toSelect` text in it to get `newStartColumn`
*
* 3. `newEndLineNumber` — Since this method is supposed to be used with
* markdown decorators that are pretty short, the `newEndLineNumber` is
* suggested to be assumed the same as the startLine.
* 4. `newEndColumn` — pretty obvious
* 5. Adjust the start and end positions of the current selection
* 6. Re-set selection on the instance
*
* @param {module:source_editor_instance~EditorInstance} instance - The Source Editor instance. Is passed automatically.
* @param {string} toSelect - New text to select within current selection.
* @param {string} selectedText - Currently selected text. It's just a
* shortcut: If it's not supplied, we fetch selected text from the instance
*/
selectWithinSelection: (instance, toSelect, selectedText) => {
const currentSelection = instance.getSelection();
if (currentSelection.isEmpty() || !toSelect) {
return;
}
const text = selectedText || instance.getSelectedText(currentSelection);
let lineShift;
let newStartLineNumber;
let newStartColumn;
const textLines = text.split('\n');
if (textLines.length > 1) {
// Multi-line selection
lineShift = textLines.findIndex((line) => line.indexOf(toSelect) !== -1);
newStartLineNumber = currentSelection.startLineNumber + lineShift;
newStartColumn = textLines[lineShift].indexOf(toSelect) + 1;
} else {
// Single-line selection
newStartLineNumber = currentSelection.startLineNumber;
newStartColumn = currentSelection.startColumn + text.indexOf(toSelect);
}
const newEndLineNumber = newStartLineNumber;
const newEndColumn = newStartColumn + toSelect.length;
const newSelection = currentSelection
.setStartPosition(newStartLineNumber, newStartColumn)
.setEndPosition(newEndLineNumber, newEndColumn);
instance.setSelection(newSelection);
},
};
}
}
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