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matchbrackets-wmde.js
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matchbrackets-wmde.js
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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE
/**
* Modified by the WMDE Technical Wishes Team
* currently based on
* https://github.com/codemirror/CodeMirror/blob/4823ade863d0306371858394bc1b117aed3043bf/addon/edit/matchbrackets.js
* (from 2021-01-14)
*
* Modifications:
* - Introduced findSurroundingBrackets() along with it's `brackets` map. This is called when no
* `match` is found at the current cursor position.
* - Removed the `style` argument from the `scanForBracket` call. This fixes a compatibility issue
* with the "mediawiki" mode that tokenizes some brackets as `[[` or `{{{` pairs or triplets.
* - Changed the class name `CodeMirror-matchingbracket` to `cm-mw-matchingbracket`. This is
* necessary to get rid of the "default styles for common addons" from codemirror.css (T270926).
*/
/* eslint-disable */
(function(mod) {
if (typeof exports == "object" && typeof module == "object") // CommonJS
mod(require("../../lib/codemirror"));
else if (typeof define == "function" && define.amd) // AMD
define(["../../lib/codemirror"], mod);
else // Plain browser env
mod(CodeMirror);
})(function(CodeMirror) {
var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
(document.documentMode == null || document.documentMode < 8);
var Pos = CodeMirror.Pos;
var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<", "<": ">>", ">": "<<"};
function bracketRegex(config) {
return config && config.bracketRegex || /[(){}[\]]/
}
/* eslint-enable */
const surroundingBrackets = {
'(': ')',
')': false,
'[': ']',
']': false,
'{': '}',
'}': false
};
function findSurroundingBrackets( cm, where, config ) {
let from, to, ch,
nestedBracketsToSkip = 0,
lineNo = where.line,
line = cm.getLine( lineNo ),
pos = where.ch;
const maxScanLen = ( config && config.maxScanLineLength ) || 10000,
maxScanLines = ( config && config.maxScanLines ) || 1000;
// Check the limit for the current line
if ( line.length > maxScanLen ) {
return null;
}
// Search forward
while ( true ) {
if ( pos >= line.length ) {
lineNo++;
// Give up when to many lines have been scanned
if ( lineNo > cm.lastLine() || lineNo - where.line >= maxScanLines ) {
break;
}
line = cm.getLine( lineNo );
// Give up when the next line is to long
if ( line.length > maxScanLen ) {
return null;
}
pos = 0;
// Continue early to make sure we don't read characters from empty lines
continue;
}
ch = line.charAt( pos );
if ( ch in surroundingBrackets ) {
// Found a closing bracket that's not part of a nested pair
if ( !surroundingBrackets[ch] && nestedBracketsToSkip <= 0 ) {
to = { pos: Pos( lineNo, pos ), char: ch };
break;
}
nestedBracketsToSkip += surroundingBrackets[ch] ? 1 : -1;
}
pos++;
}
nestedBracketsToSkip = 0;
lineNo = where.line;
line = cm.getLine( lineNo );
pos = where.ch;
// Search backwards
while ( true ) {
pos--;
if ( pos < 0 ) {
lineNo--;
// Give up when to many lines have been scanned
if ( lineNo < cm.firstLine() || where.line - lineNo >= maxScanLines ) {
break;
}
line = cm.getLine( lineNo );
// Give up when the next line is to long
if ( line.length > maxScanLen ) {
return null;
}
pos = line.length;
// Continue early to make sure we don't read characters from empty lines
continue;
}
ch = line.charAt( pos );
if ( ch in surroundingBrackets ) {
// Found an opening bracket that's not part of a nested pair
if ( surroundingBrackets[ch] && nestedBracketsToSkip <= 0 ) {
from = { pos: Pos( lineNo, pos ), expectedToChar: surroundingBrackets[ch] };
break;
}
nestedBracketsToSkip += surroundingBrackets[ch] ? -1 : 1;
}
}
if ( from && to ) {
return {
from: from.pos,
to: to.pos,
match: from.expectedToChar === to.char
};
} else if ( from || to ) {
return { from: ( from || to ).pos, match: false };
}
return null;
}
function stillTheSameMarks( marks, config ) {
const same = config.currentMarks &&
// No need to compare the details if it's not even the same amount
config.currentMarks.length === marks.length &&
// We need the flexibility because the order can be closing → opening bracket as well
marks.every( ( mark ) => {
// These are typically only 2 elements for the opening and closing bracket
for ( let i = 0; i < config.currentMarks.length; i++ ) {
// Ordered from "most likely to change" to "least likely" for performance
if ( config.currentMarks[i].from.ch === mark.from.ch &&
config.currentMarks[i].from.line === mark.from.line &&
config.currentMarks[i].match === mark.match
) {
// This assumes all elements are unique, which should be the case
config.currentMarks.splice( i, 1 );
return true;
}
}
return false;
} ) &&
// Must be empty at the end, i.e. all elements must have been found and removed
!config.currentMarks.length;
// Restore config.currentMarks after the loop above destroyed the original. This is done for
// performance reasons to avoid the need for an (expensive) copy.
config.currentMarks = marks;
return same;
}
/* eslint-disable */
function findMatchingBracket(cm, where, config) {
var line = cm.getLineHandle(where.line), pos = where.ch - 1;
var afterCursor = config && config.afterCursor
if (afterCursor == null)
afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)
var re = bracketRegex(config)
// A cursor is defined as between two characters, but in in vim command mode
// (i.e. not insert mode), the cursor is visually represented as a
// highlighted box on top of the 2nd character. Otherwise, we allow matches
// from before or after the cursor.
var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||
re.test(line.text.charAt(pos + 1)) && matching[line.text.charAt(++pos)];
// Note: Modified by WMDE, was `return null` before.
if (!match) return findSurroundingBrackets( cm, where, config );
var dir = match.charAt(1) == ">" ? 1 : -1;
if (config && config.strict && (dir > 0) != (pos == where.ch)) return null;
// Note: Disabled by WMDE for performance reasons. Not used anymore further down.
// var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));
// Note: Modified by WMDE, used `style || null` instead of `undefined` before.
var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, undefined, config);
if (found == null) return null;
return {from: Pos(where.line, pos), to: found && found.pos,
match: found && found.ch == match.charAt(0), forward: dir > 0};
}
// bracketRegex is used to specify which type of bracket to scan
// should be a regexp, e.g. /[[\]]/
//
// Note: If "where" is on an open bracket, then this bracket is ignored.
//
// Returns false when no bracket was found, null when it reached
// maxScanLines and gave up
function scanForBracket(cm, where, dir, style, config) {
var maxScanLen = (config && config.maxScanLineLength) || 10000;
var maxScanLines = (config && config.maxScanLines) || 1000;
var stack = [];
var re = bracketRegex(config)
var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
: Math.max(cm.firstLine() - 1, where.line - maxScanLines);
for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
var line = cm.getLine(lineNo);
if (!line) continue;
var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
if (line.length > maxScanLen) continue;
if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
for (; pos != end; pos += dir) {
var ch = line.charAt(pos);
if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {
var match = matching[ch];
if (match && (match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
else stack.pop();
}
}
}
return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;
}
function matchBrackets(cm, autoclear, config) {
// Disable brace matching in long lines, since it'll cause hugely slow updates
var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000,
highlightNonMatching = config && config.highlightNonMatching;
var i, markPositions = [], marks = [], ranges = cm.listSelections();
for (i = 0; i < ranges.length; i++) {
var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config);
if (match && (match.match || highlightNonMatching !== false) && cm.getLine(match.from.line).length <= maxHighlightLen) {
// Note: Modified by WMDE, now uses an intermediate format to delay the actual highlighting
markPositions.push(match);
if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)
markPositions.push({from: match.to, match: match.match});
}
}
/* eslint-enable */
// There is no config when autoclear is true
if ( config && stillTheSameMarks( markPositions, config ) ) {
return;
}
if ( !autoclear && config.currentlyHighlighted ) {
config.currentlyHighlighted();
config.currentlyHighlighted = null;
// Backup of the new mark positions must be done after the clear above
config.currentMarks = markPositions;
}
for ( i = 0; i < markPositions.length; i++ ) {
marks.push( cm.markText(
markPositions[i].from,
// Note: This assumes there is always exactly 1 character to highlight
Pos( markPositions[i].from.line, markPositions[i].from.ch + 1 ),
// Note: Modified by WMDE to get rid of the library's "default styles for common addons"
{ className: markPositions[i].match ? 'cm-mw-matchingbracket' : 'CodeMirror-nonmatchingbracket' }
) );
}
/* eslint-disable */
if (marks.length) {
// Kludge to work around the IE bug from issue #1193, where text
// input stops going to the textarea whenever this fires.
if (ie_lt8 && cm.state.focused) cm.focus();
var clear = function() {
cm.operation(function() {
for (var i = 0; i < marks.length; i++) marks[i].clear();
config.currentMarks = [];
});
};
if (autoclear) setTimeout(clear, 800);
else config.currentlyHighlighted = clear;
}
}
function doMatchBrackets(cm) {
cm.operation(function() {
matchBrackets(cm, false, cm.state.matchBrackets);
});
}
function clearHighlighted(cm) {
if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {
cm.state.matchBrackets.currentlyHighlighted();
cm.state.matchBrackets.currentlyHighlighted = null;
}
}
CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
if (old && old != CodeMirror.Init) {
cm.off("cursorActivity", doMatchBrackets);
cm.off("focus", doMatchBrackets)
cm.off("blur", clearHighlighted)
clearHighlighted(cm);
}
if (val) {
cm.state.matchBrackets = typeof val == "object" ? val : {};
cm.on("cursorActivity", doMatchBrackets);
cm.on("focus", doMatchBrackets)
cm.on("blur", clearHighlighted)
}
});
CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
CodeMirror.defineExtension("findMatchingBracket", function(pos, config, oldConfig){
// Backwards-compatibility kludge
if (oldConfig || typeof config == "boolean") {
if (!oldConfig) {
config = config ? {strict: true} : null
} else {
oldConfig.strict = config
config = oldConfig
}
}
return findMatchingBracket(this, pos, config)
});
CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){
return scanForBracket(this, pos, dir, style, config);
});
});

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