CyTube/www/js/tabcomplete.js
2018-11-12 21:01:43 -08:00

149 lines
4.5 KiB
JavaScript

CyTube.tabCompleteMethods = {};
// Bash-style completion
// Only completes as far as it is possible to maintain uniqueness of the completion.
CyTube.tabCompleteMethods['Longest unique match'] = function (input, position, options, context) {
var lower = input.toLowerCase();
// First, backtrack to the nearest whitespace to find the
// incomplete string that should be completed.
var start;
var incomplete = '';
for (start = position - 1; start >= 0; start--) {
if (/\s/.test(lower[start])) {
break;
}
incomplete = lower[start] + incomplete;
}
start++;
// Nothing to complete
if (!incomplete.length) {
return {
text: input,
newPosition: position
};
}
var matches = options.filter(function (option) {
return option.toLowerCase().indexOf(incomplete) === 0;
});
var completed;
var isFullMatch = false;
if (matches.length === 0) {
return {
text: input,
newPosition: position
};
} else if (matches.length === 1) {
// Unique match
completed = matches[0];
isFullMatch = true;
} else {
// There is not a unique match, find the longest possible prefix
// that results in a unique completion
// Do this by comparing each match to the next and trimming to the
// first index where they differ.
var currentPrefix = null;
for (var i = 0; i < matches.length - 1; i++) {
var first = matches[i];
var second = matches[i+1];
var nextPrefix = '';
for (var j = 0; (currentPrefix === null || j < currentPrefix.length)
&& j < first.length
&& j < second.length; j++) {
if (first[j].toLowerCase() === second[j].toLowerCase()) {
nextPrefix += first[j];
} else {
break;
}
}
if (currentPrefix === null || nextPrefix.length < currentPrefix.length) {
currentPrefix = nextPrefix;
}
}
completed = currentPrefix;
}
var space = isFullMatch ? ' ' : '';
return {
text: input.substring(0, start) + completed + space + input.substring(position),
newPosition: start + completed.length + space.length
};
};
// Zsh-style completion.
// Always complete a full option, and cycle through available options on successive tabs
CyTube.tabCompleteMethods['Cycle options'] = function (input, position, options, context) {
if (typeof context.start !== 'undefined') {
var currentCompletion = input.substring(context.start, position - 1);
if (currentCompletion === context.matches[context.tabIndex]) {
context.tabIndex = (context.tabIndex + 1) % context.matches.length;
var completed = context.matches[context.tabIndex];
return {
text: input.substring(0, context.start) + completed + ' ' + input.substring(position),
newPosition: context.start + completed.length + 1
};
} else {
delete context.matches;
delete context.tabIndex;
delete context.start;
}
}
var lower = input.toLowerCase();
// First, backtrack to the nearest whitespace to find the
// incomplete string that should be completed.
var start;
var incomplete = '';
for (start = position - 1; start >= 0; start--) {
if (/\s/.test(lower[start])) {
break;
}
incomplete = lower[start] + incomplete;
}
start++;
// Nothing to complete
if (!incomplete.length) {
return {
text: input,
newPosition: position
};
}
var matches = options.filter(function (option) {
return option.toLowerCase().indexOf(incomplete) === 0;
}).sort(function (a, b) {
var aLower = a.toLowerCase();
var bLower = b.toLowerCase();
if (aLower > bLower) {
return 1;
} else if (aLower < bLower) {
return -1;
} else {
return 0;
}
});
if (matches.length === 0) {
return {
text: input,
newPosition: position
};
}
context.start = start;
context.matches = matches;
context.tabIndex = 0;
return {
text: input.substring(0, start) + matches[0] + ' ' + input.substring(position),
newPosition: start + matches[0].length + 1
};
};