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processTargets.ts
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processTargets.ts
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import { concat, range, zip } from "lodash";
import update from "immutability-helper";
import { SyntaxNode } from "web-tree-sitter";
import * as vscode from "vscode";
import { Position, Selection } from "vscode";
import { nodeMatchers } from "./languages";
import {
Mark,
PrimitiveTarget,
ProcessedTargetsContext,
RangeTarget,
SelectionContext,
SelectionWithContext,
SelectionWithEditor,
Target,
TypedSelection,
} from "./Types";
import { performInsideOutsideAdjustment } from "./performInsideOutsideAdjustment";
import { SUBWORD_MATCHER } from "./constants";
export default function processTargets(
context: ProcessedTargetsContext,
targets: Target[]
): TypedSelection[][] {
return targets.map((target) => processSingleTarget(context, target));
}
function processSingleTarget(
context: ProcessedTargetsContext,
target: Target
): TypedSelection[] {
switch (target.type) {
case "list":
return concat(
[],
...target.elements.map((target) => processSingleTarget(context, target))
);
case "range":
return processSingleRangeTarget(context, target).map((selection) =>
performInsideOutsideAdjustment(selection)
);
case "primitive":
return processSinglePrimitiveTarget(context, target).map((selection) =>
performInsideOutsideAdjustment(selection)
);
}
}
function processSingleRangeTarget(
context: ProcessedTargetsContext,
target: RangeTarget
): TypedSelection[] {
const startTargets = processSinglePrimitiveTarget(context, target.start);
const endTargets = processSinglePrimitiveTarget(context, target.end);
if (startTargets.length !== endTargets.length) {
throw new Error("startTargets and endTargets lengths don't match");
}
return zip(startTargets, endTargets).map(([startTarget, endTarget]) => {
if (startTarget!.selection.editor !== endTarget!.selection.editor) {
throw new Error("startTarget and endTarget must be in same document");
}
const startSelection = startTarget!.selection.selection;
const endSelection = endTarget!.selection.selection;
const isStartBeforeEnd = startSelection.start.isBeforeOrEqual(
endSelection.end
);
const anchor = isStartBeforeEnd ? startSelection.start : startSelection.end;
const active = isStartBeforeEnd ? endSelection.end : endSelection.start;
const leadingDelimiterRange = isStartBeforeEnd
? startTarget!.selectionContext.leadingDelimiterRange
: endTarget!.selectionContext.leadingDelimiterRange;
const trailingDelimiterRange = isStartBeforeEnd
? endTarget!.selectionContext.trailingDelimiterRange
: startTarget!.selectionContext.trailingDelimiterRange;
return {
selection: {
selection: new Selection(anchor, active),
editor: startTarget!.selection.editor,
},
selectionType: startTarget!.selectionType,
selectionContext: {
containingListDelimiter:
startTarget!.selectionContext.containingListDelimiter,
isInDelimitedList: startTarget!.selectionContext.isInDelimitedList,
leadingDelimiterRange,
trailingDelimiterRange,
},
insideOutsideType: startTarget!.insideOutsideType,
};
});
}
function processSinglePrimitiveTarget(
context: ProcessedTargetsContext,
target: PrimitiveTarget
): TypedSelection[] {
const markSelections = getSelectionsFromMark(context, target.mark);
const transformedSelections = concat(
[],
...markSelections.map((markSelection) =>
transformSelection(context, target, markSelection)
)
);
const typedSelections = transformedSelections.map(
({ selection, context: selectionContext }) =>
createTypedSelection(context, target, selection, selectionContext)
);
return typedSelections.map((selection) =>
performPositionAdjustment(context, target, selection)
);
}
function getSelectionsFromMark(
context: ProcessedTargetsContext,
mark: Mark
): SelectionWithEditor[] {
switch (mark.type) {
case "cursor":
return context.currentSelections;
case "decoratedSymbol":
const token = context.navigationMap.getToken(
mark.symbolColor,
mark.character
);
if (token == null) {
throw new Error(
`Couldn't find mark ${mark.symbolColor} '${mark.character}'`
);
}
return [
{
selection: new Selection(token.range.start, token.range.end),
editor: token.editor,
},
];
case "that":
return context.thatMark;
case "lastCursorPosition":
throw new Error("Not implemented");
}
}
function transformSelection(
context: ProcessedTargetsContext,
target: PrimitiveTarget,
selection: SelectionWithEditor
): { selection: SelectionWithEditor; context: SelectionContext }[] {
const { transformation } = target;
switch (transformation.type) {
case "identity":
return [{ selection, context: {} }];
case "containingScope":
var node: SyntaxNode | null = context.getNodeAtLocation(
new vscode.Location(selection.editor.document.uri, selection.selection)
);
const nodeMatcher =
nodeMatchers[selection.editor.document.languageId][
transformation.scopeType
];
while (node != null) {
const matchedSelection = nodeMatcher(selection.editor, node);
if (matchedSelection != null) {
var matchedSelections: SelectionWithContext[];
if (transformation.includeSiblings) {
matchedSelections = node
.parent!.children.map((sibling) =>
nodeMatcher(selection.editor, sibling)
)
.filter(
(selection) => selection != null
) as SelectionWithContext[];
} else {
matchedSelections = [matchedSelection];
}
return matchedSelections.map((matchedSelection) => ({
selection: {
editor: selection.editor,
selection: matchedSelection.selection,
},
context: matchedSelection.context,
}));
}
console.log(node.type);
node = node.parent;
}
throw new Error(`Couldn't find containing ${transformation.scopeType}`);
case "subpiece":
const token = selection.editor.document.getText(selection.selection);
let pieces: { start: number; end: number }[] = [];
if (transformation.pieceType === "subtoken") {
const matches = token.matchAll(SUBWORD_MATCHER);
for (const match of matches) {
pieces.push({
start: match.index!,
end: match.index! + match[0].length,
});
}
} else if (transformation.pieceType === "character") {
pieces = range(token.length).map((index) => ({
start: index,
end: index + 1,
}));
}
// NB: We use the modulo here to handle negative offsets
const endIndex =
transformation.endIndex == null
? pieces.length
: transformation.endIndex <= 0
? transformation.endIndex + pieces.length
: transformation.endIndex;
const startIndex =
transformation.startIndex < 0
? transformation.startIndex + pieces.length
: transformation.startIndex;
const start = selection.selection.start.translate(
undefined,
pieces[startIndex].start
);
const end = selection.selection.start.translate(
undefined,
pieces[endIndex - 1].end
);
return [
{
selection: update(selection, {
selection: (s) =>
s.isReversed
? new Selection(end, start)
: new Selection(start, end),
}),
context: {},
},
];
case "matchingPairSymbol":
case "surroundingPair":
throw new Error("Not implemented");
}
}
function createTypedSelection(
context: ProcessedTargetsContext,
target: PrimitiveTarget,
selection: SelectionWithEditor,
selectionContext: SelectionContext
): TypedSelection {
const { selectionType, insideOutsideType } = target;
var start: vscode.Position;
var end: vscode.Position;
switch (selectionType) {
case "token":
return {
selection,
selectionType,
selectionContext,
insideOutsideType: target.insideOutsideType ?? null,
};
case "line":
const originalSelectionStart = selection.selection.start;
const originalSelectionEnd = selection.selection.end;
if (insideOutsideType) {
const startLine = selection.editor.document.lineAt(
originalSelectionStart.line
);
const endLine = selection.editor.document.lineAt(
originalSelectionEnd.line
);
start = new vscode.Position(
originalSelectionStart.line,
startLine.firstNonWhitespaceCharacterIndex
);
end = endLine.range.end;
} else {
start = new vscode.Position(originalSelectionStart.line, 0);
end =
originalSelectionEnd.line > originalSelectionStart.line &&
originalSelectionEnd.character === 0
? originalSelectionEnd
: new vscode.Position(originalSelectionEnd.line + 1, 0);
}
const isAnchorBeforeActive = selection.selection.anchor.isBeforeOrEqual(
selection.selection.active
);
const anchor = isAnchorBeforeActive ? start : end;
const active = isAnchorBeforeActive ? end : start;
return {
selection: {
selection: new Selection(anchor, active),
editor: selection.editor,
},
selectionType,
selectionContext,
insideOutsideType: target.insideOutsideType ?? null,
};
case "document":
const document = selection.editor.document;
// From https://stackoverflow.com/a/46427868
const firstLine = document.lineAt(0);
const lastLine = document.lineAt(document.lineCount - 1);
start = firstLine.range.start;
end = lastLine.range.end;
return {
selection: update(selection, {
selection: (s) =>
s.isReversed
? new Selection(end, start)
: new Selection(start, end),
}),
selectionType,
selectionContext,
insideOutsideType: target.insideOutsideType ?? null,
};
case "block":
case "character":
throw new Error("Not implemented");
}
}
function performPositionAdjustment(
context: ProcessedTargetsContext,
target: PrimitiveTarget,
selection: TypedSelection
): TypedSelection {
var newSelection;
const { position } = target;
const originalSelection = selection.selection.selection;
switch (position) {
case "contents":
newSelection = originalSelection;
break;
case "before":
newSelection = new Selection(
originalSelection.start,
originalSelection.start
);
break;
case "after":
newSelection = new Selection(
originalSelection.end,
originalSelection.end
);
break;
}
return {
selection: {
selection: newSelection,
editor: selection.selection.editor,
},
selectionType: selection.selectionType,
selectionContext: selection.selectionContext,
insideOutsideType: target.insideOutsideType ?? null,
};
}