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public/javascripts/ace/ext-whitespace.js  view on Meta::CPAN

define("ace/ext/whitespace",["require","exports","module","ace/lib/lang"], function(require, exports, module) {
"use strict";

var lang = require("../lib/lang");
exports.$detectIndentation = function(lines, fallback) {
    var stats = [];
    var changes = [];
    var tabIndents = 0;
    var prevSpaces = 0;
    var max = Math.min(lines.length, 1000);
    for (var i = 0; i < max; i++) {
        var line = lines[i];
        if (!/^\s*[^*+\-\s]/.test(line))
            continue;

        if (line[0] == "\t") {
            tabIndents++;
            prevSpaces = -Number.MAX_VALUE;
        } else {
            var spaces = line.match(/^ */)[0].length;
            if (spaces && line[spaces] != "\t") {
                var diff = spaces - prevSpaces;
                if (diff > 0 && !(prevSpaces%diff) && !(spaces%diff))
                    changes[diff] = (changes[diff] || 0) + 1;
    
                stats[spaces] = (stats[spaces] || 0) + 1;
            }
            prevSpaces = spaces;
        }
        while (i < max && line[line.length - 1] == "\\")
            line = lines[i++];
    }
    
    function getScore(indent) {
        var score = 0;
        for (var i = indent; i < stats.length; i += indent)
            score += stats[i] || 0;
        return score;
    }

    var changesTotal = changes.reduce(function(a,b){return a+b;}, 0);

    var first = {score: 0, length: 0};
    var spaceIndents = 0;
    for (var i = 1; i < 12; i++) {
        var score = getScore(i);
        if (i == 1) {
            spaceIndents = score;
            score = stats[1] ? 0.9 : 0.8;
            if (!stats.length)
                score = 0;
        } else
            score /= spaceIndents;

        if (changes[i])
            score += changes[i] / changesTotal;

        if (score > first.score)
            first = {score: score, length: i};
    }

    if (first.score && first.score > 1.4)
        var tabLength = first.length;