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✏️ Editing: mode_test.js

/**

* Helper to test CodeMirror highlighting modes. It pretty prints output of the

* highlighter and can check against expected styles.

* Mode tests are registered by calling test.mode(testName, mode,

* tokens), where mode is a mode object as returned by

* CodeMirror.getMode, and tokens is an array of lines that make up

* the test.

* These lines are strings, in which styled stretches of code are

* enclosed in brackets `[]`, and prefixed by their style. For

* example, `[keyword if]`. Brackets in the code itself must be

* duplicated to prevent them from being interpreted as token

* boundaries. For example `a[[i]]` for `a[i]`. If a token has

* multiple styles, the styles must be separated by ampersands, for

* example `[tag&error </hmtl>]`.

* See the test.js files in the css, markdown, gfm, and stex mode

* directories for examples.

(function() {

function findSingle(str, pos, ch) {

for (;;) {

var found = str.indexOf(ch, pos);

if (found == -1) return null;

if (str.charAt(found + 1) != ch) return found;

pos = found + 2;

}

var styleName = /[\w&-_]+/g;

function parseTokens(strs) {

var tokens = [], plain = "";

for (var i = 0; i < strs.length; ++i) {

if (i) plain += "\n";

var str = strs[i], pos = 0;

while (pos < str.length) {

var style = null, text;

if (str.charAt(pos) == "[" && str.charAt(pos+1) != "[") {

styleName.lastIndex = pos + 1;

var m = styleName.exec(str);

style = m[0].replace(/&/g, " ");

var textStart = pos + style.length + 2;

var end = findSingle(str, textStart, "]");

if (end == null) throw new Error("Unterminated token at " + pos + " in '" + str + "'" + style);

text = str.slice(textStart, end);

pos = end + 1;

} else {

var end = findSingle(str, pos, "[");

if (end == null) end = str.length;

text = str.slice(pos, end);

pos = end;

}

text = text.replace(/\[\[|\]\]/g, function(s) {return s.charAt(0);});

tokens.push({style: style, text: text});

plain += text;

}

return {tokens: tokens, plain: plain};

}

test.mode = function(name, mode, tokens, modeName) {

var data = parseTokens(tokens);

return test((modeName || mode.name) + "_" + name, function() {

return compare(data.plain, data.tokens, mode);

});

};

function esc(str) {

return str.replace('&', '&amp;').replace('<', '&lt;').replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#039;");

;

}

function compare(text, expected, mode) {

var expectedOutput = [];

for (var i = 0; i < expected.length; ++i) {

var sty = expected[i].style;

if (sty && sty.indexOf(" ")) sty = sty.split(' ').sort().join(' ');

expectedOutput.push({style: sty, text: expected[i].text});

}

var observedOutput = highlight(text, mode);

var s = "";

var diff = highlightOutputsDifferent(expectedOutput, observedOutput);

if (diff != null) {

s += '<div class="mt-test mt-fail">';

s +=   '<pre>' + esc(text) + '</pre>';

s +=   '<div class="cm-s-default">';

s += 'expected:';

s +=   prettyPrintOutputTable(expectedOutput, diff);

s += 'observed: [<a onclick="this.parentElement.className+=\' mt-state-unhide\'">display states</a>]';

s +=   prettyPrintOutputTable(observedOutput, diff);

s +=   '</div>';

s += '</div>';

}

if (observedOutput.indentFailures) {

for (var i = 0; i < observedOutput.indentFailures.length; i++)

s += "<div class='mt-test mt-fail'>" + esc(observedOutput.indentFailures[i]) + "</div>";

}

if (s) throw new Failure(s);

}

function stringify(obj) {

function replacer(key, obj) {

if (typeof obj == "function") {

var m = obj.toString().match(/function\s*[^\s(]*/);

return m ? m[0] : "function";

}

return obj;

}

if (window.JSON && JSON.stringify)

return JSON.stringify(obj, replacer, 2);

return "[unsupported]";  // Fail safely if no native JSON.

}

function highlight(string, mode) {

var state = mode.startState();

var lines = string.replace(/\r\n/g,'\n').split('\n');

var st = [], pos = 0;

for (var i = 0; i < lines.length; ++i) {

var line = lines[i], newLine = true;

if (mode.indent) {

var ws = line.match(/^\s*/)[0];

var indent = mode.indent(state, line.slice(ws.length));

if (indent != CodeMirror.Pass && indent != ws.length)

(st.indentFailures || (st.indentFailures = [])).push(

"Indentation of line " + (i + 1) + " is " + indent + " (expected " + ws.length + ")");

}

var stream = new CodeMirror.StringStream(line);

if (line == "" && mode.blankLine) mode.blankLine(state);

/* Start copied code from CodeMirror.highlight */

while (!stream.eol()) {

for (var j = 0; j < 10 && stream.start >= stream.pos; j++)

var compare = mode.token(stream, state);

if (j == 10)

throw new Failure("Failed to advance the stream." + stream.string + " " + stream.pos);

var substr = stream.current();

if (compare && compare.indexOf(" ") > -1) compare = compare.split(' ').sort().join(' ');

stream.start = stream.pos;

if (pos && st[pos-1].style == compare && !newLine) {

st[pos-1].text += substr;

} else if (substr) {

st[pos++] = {style: compare, text: substr, state: stringify(state)};

}

// Give up when line is ridiculously long

if (stream.pos > 5000) {

st[pos++] = {style: null, text: this.text.slice(stream.pos)};

break;

}

newLine = false;

}

return st;

}

function highlightOutputsDifferent(o1, o2) {

var minLen = Math.min(o1.length, o2.length);

for (var i = 0; i < minLen; ++i)

if (o1[i].style != o2[i].style || o1[i].text != o2[i].text) return i;

if (o1.length > minLen || o2.length > minLen) return minLen;

}

function prettyPrintOutputTable(output, diffAt) {

var s = '<table class="mt-output">';

s += '<tr>';

for (var i = 0; i < output.length; ++i) {

var style = output[i].style, val = output[i].text;

s +=

'<td class="mt-token"' + (i == diffAt * 2 ? " style='background: pink'" : "") + '>' +

'<span class="cm-' + esc(String(style)) + '">' +

esc(val.replace(/ /g,'\xb7')) +  // · MIDDLE DOT

'</span>' +

'</td>';

}

s += '</tr><tr>';

for (var i = 0; i < output.length; ++i) {

s += '<td class="mt-style"><span>' + (output[i].style || null) + '</span></td>';

}

if(output[0].state) {

s += '</tr><tr class="mt-state-row" title="State AFTER each token">';

for (var i = 0; i < output.length; ++i) {

s += '<td class="mt-state"><pre>' + esc(output[i].state) + '</pre></td>';

}

s += '</tr></table>';

return s;

}

})();

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