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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
const vscode = require("vscode");
const documentMergeConflict_1 = require("./documentMergeConflict");
const startHeaderMarker = '<<<<<<<';
const commonAncestorsMarker = '|||||||';
const splitterMarker = '=======';
const endFooterMarker = '>>>>>>>';
class MergeConflictParser {
static scanDocument(document) {
// Scan each line in the document, we already know there is at least a <<<<<<< and
// >>>>>> marker within the document, we need to group these into conflict ranges.
// We initially build a scan match, that references the lines of the header, splitter
// and footer. This is then converted into a full descriptor containing all required
// ranges.
let currentConflict = null;
const conflictDescriptors = [];
for (let i = 0; i < document.lineCount; i++) {
const line = document.lineAt(i);
// Ignore empty lines
if (!line || line.isEmptyOrWhitespace) {
continue;
}
// Is this a start line? <<<<<<<
if (line.text.startsWith(startHeaderMarker)) {
if (currentConflict !== null) {
// Error, we should not see a startMarker before we've seen an endMarker
currentConflict = null;
// Give up parsing, anything matched up this to this point will be decorated
// anything after will not
break;
}
// Create a new conflict starting at this line
currentConflict = { startHeader: line, commonAncestors: [] };
}
// Are we within a conflict block and is this a common ancestors marker? |||||||
else if (currentConflict && !currentConflict.splitter && line.text.startsWith(commonAncestorsMarker)) {
currentConflict.commonAncestors.push(line);
}
// Are we within a conflict block and is this a splitter? =======
else if (currentConflict && !currentConflict.splitter && line.text.startsWith(splitterMarker)) {
currentConflict.splitter = line;
}
// Are we within a conflict block and is this a footer? >>>>>>>
else if (currentConflict && line.text.startsWith(endFooterMarker)) {
currentConflict.endFooter = line;
// Create a full descriptor from the lines that we matched. This can return
// null if the descriptor could not be completed.
let completeDescriptor = MergeConflictParser.scanItemTolMergeConflictDescriptor(document, currentConflict);
if (completeDescriptor !== null) {
conflictDescriptors.push(completeDescriptor);
}
// Reset the current conflict to be empty, so we can match the next
// starting header marker.
currentConflict = null;
}
}
return conflictDescriptors
.filter(Boolean)
.map(descriptor => new documentMergeConflict_1.DocumentMergeConflict(descriptor));
}
static scanItemTolMergeConflictDescriptor(document, scanned) {
// Validate we have all the required lines within the scan item.
if (!scanned.startHeader || !scanned.splitter || !scanned.endFooter) {
return null;
}
let tokenAfterCurrentBlock = scanned.commonAncestors[0] || scanned.splitter;
// Assume that descriptor.current.header, descriptor.incoming.header and descriptor.splitter
// have valid ranges, fill in content and total ranges from these parts.
// NOTE: We need to shift the decorator range back one character so the splitter does not end up with
// two decoration colors (current and splitter), if we take the new line from the content into account
// the decorator will wrap to the next line.
return {
current: {
header: scanned.startHeader.range,
decoratorContent: new vscode.Range(scanned.startHeader.rangeIncludingLineBreak.end, MergeConflictParser.shiftBackOneCharacter(document, tokenAfterCurrentBlock.range.start, scanned.startHeader.rangeIncludingLineBreak.end)),
// Current content is range between header (shifted for linebreak) and splitter or common ancestors mark start
content: new vscode.Range(scanned.startHeader.rangeIncludingLineBreak.end, tokenAfterCurrentBlock.range.start),
name: scanned.startHeader.text.substring(startHeaderMarker.length + 1)
},
commonAncestors: scanned.commonAncestors.map((currentTokenLine, index, commonAncestors) => {
let nextTokenLine = commonAncestors[index + 1] || scanned.splitter;
return {
header: currentTokenLine.range,
decoratorContent: new vscode.Range(currentTokenLine.rangeIncludingLineBreak.end, MergeConflictParser.shiftBackOneCharacter(document, nextTokenLine.range.start, currentTokenLine.rangeIncludingLineBreak.end)),
// Each common ancestors block is range between one common ancestors token
// (shifted for linebreak) and start of next common ancestors token or splitter
content: new vscode.Range(currentTokenLine.rangeIncludingLineBreak.end, nextTokenLine.range.start),
name: currentTokenLine.text.substring(commonAncestorsMarker.length + 1)
};
}),
splitter: scanned.splitter.range,
incoming: {
header: scanned.endFooter.range,
decoratorContent: new vscode.Range(scanned.splitter.rangeIncludingLineBreak.end, MergeConflictParser.shiftBackOneCharacter(document, scanned.endFooter.range.start, scanned.splitter.rangeIncludingLineBreak.end)),
// Incoming content is range between splitter (shifted for linebreak) and footer start
content: new vscode.Range(scanned.splitter.rangeIncludingLineBreak.end, scanned.endFooter.range.start),
name: scanned.endFooter.text.substring(endFooterMarker.length + 1)
},
// Entire range is between current header start and incoming header end (including line break)
range: new vscode.Range(scanned.startHeader.range.start, scanned.endFooter.rangeIncludingLineBreak.end)
};
}
static containsConflict(document) {
if (!document) {
return false;
}
let text = document.getText();
return text.includes(startHeaderMarker) && text.includes(endFooterMarker);
}
static shiftBackOneCharacter(document, range, unlessEqual) {
if (range.isEqual(unlessEqual)) {
return range;
}
let line = range.line;
let character = range.character - 1;
if (character < 0) {
line--;
character = document.lineAt(line).range.end.character;
}
return new vscode.Position(line, character);
}
}
exports.MergeConflictParser = MergeConflictParser;
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