/
usage.demo.js
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/
usage.demo.js
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/*jslint indent: 2, maxlen: 80, continue: false, unparam: false, node: true */
/* -*- tab-width: 2 -*- */
'use strict';
function usageDemo(dump) {
var genDiffCtx = require('generic-diff-context'), a, b, opt, diff;
a = "hello world";
b = "help arnold";
dump(genDiffCtx(a, b));
//= `[ { added: false, removed: false, sign: ' ',`
//= ` a: { items: 'hel', start: 0 }, b: { items: 'hel', start: 0 } },`
//= ` { added: false, removed: true, sign: '-',`
//= ` a: { items: 'lo', start: 3 }, b: { items: '', start: 3 } },`
//= ` { added: true, removed: false, sign: '+',`
//= ` a: { items: '', start: 5 }, b: { items: 'p', start: 3 } },`
//= ` ... 6 more items,`
//= ` a: { len: 11, lastPart: 8 }, b: { len: 11, lastPart: 8 },`
//= ` glue: '' ]`
b = a + '\n';
diff = genDiffCtx(a, b);
dump(diff);
//= `[ { added: false, removed: false, sign: ' ',`
//= ` a: { items: 'hello world', start: 0 },`
//= ` b: { items: 'hello world', start: 0 } },`
//= ` { added: true, removed: false, sign: '+',`
//= ` a: { items: '', start: 11 },`
//= ` b: { items: '\n', start: 11 } },`
//= ` a: { len: 11, lastPart: 0 }, b: { len: 12, lastPart: 1 },`
//= ` glue: '' ]`
function toWords(s) { return s.split(/\s+/); }
a = toWords("The quick brown fox jumps over the lazy dog.");
b = toWords("The fuzzy quick kitten jumps over the dog.");
diff = genDiffCtx(a, b);
dump(diff);
//= `[ { added: false, removed: false, sign: ' ',`
//= ` a: { items: [ 'The' ], start: 0 },`
//= ` b: { items: [ 'The' ], start: 0 } },`
//= ` { added: true, removed: false, sign: '+',`
//= ` a: { items: [], start: 1 },`
//= ` b: { items: [ 'fuzzy' ], start: 1 } },`
//= ` { added: false, removed: false, sign: ' ',`
//= ` a: { items: [ 'quick' ], start: 1 },`
//= ` b: { items: [ 'quick' ], start: 2 } },`
//= ` ... 5 more items,`
//= ` a: { len: 9, lastPart: 7 }, b: { len: 8, lastPart: 7 },`
//= ` glue: false ]`
a = toWords("The quick brown fox jumps over the lazy dog.");
b = toWords("The fuzzy quick kitten jumps over the dog.");
opt = { unified: 1 };
diff = genDiffCtx(a, b, opt);
dump(diff);
//= `[ [ [ ' ', 'The' ],`
//= ` [ '+', 'fuzzy' ],`
//= ` [ ' ', 'quick' ],`
//= ` ... 4 more items,`
//= ` a: { start: 0, len: 5 },`
//= ` b: { start: 0, len: 5 } ],`
//= ` [ [ ' ', 'the' ],`
//= ` [ '-', 'lazy' ],`
//= ` [ ' ', 'dog.', finalLf: { a: false, b: false } ],`
//= ` a: { start: 6, len: 3 },`
//= ` b: { start: 6, len: 2 } ],`
//= ` a: { len: 9, lastPart: 1, finalLf: false },`
//= ` b: { len: 8, lastPart: 1, finalLf: false } ]`
dump(diff.map(String));
//= `[ '@@ -1,5 +1,5 @@\n' +`
//= ` ' The\n' +`
//= ` '+fuzzy\n' +`
//= ` ' quick\n' +`
//= ` '-brown\n' +`
//= ` '-fox\n' +`
//= ` '+kitten\n' +`
//= ` ' jumps',`
//= ` '@@ -7,3 +7,2 @@\n' +`
//= ` ' the\n' +`
//= ` '-lazy\n' +`
//= ` ' dog.\n' +`
//= ` '\\ ¦' ]`
dump(String(diff).split(/\n/));
//= `[ '@@ -1,5 +1,5 @@', ' The', '+fuzzy', ... 10 more items ]`
}
var util = require('util');
usageDemo.compact = function (func, obj) {
if (obj) { func = obj[func].bind(obj); }
usageDemo(function (x) { func(usageDemo.compactInspect(x)); });
return obj;
};
usageDemo.compactInspect = function (x) {
return util.inspect(x, { maxArrayLength: 3, depth: 9002 }
).replace(/(true,)(\n)/g, '$1 $2'
).replace(/\n(\s*)(?=[ab]:)/g, '\r$1'
).replace(/( \d+ more items,)\n/g, '$1\r'
).replace(/((?:[0-9a-z']|' \]|\[\]), *)\n\s+(?=[a-z])/g, '$1 '
).replace(/(\\n)(?!')/g, "$1' +\n '"
).replace(/\r\s*(?=b:[ -~]{0,30}\},\n)/g, ' '
).replace(/\r/g, '\n');
};
usageDemo.capture = function () {
var output = [];
function dumpInspect(x) {
output.push.apply(output, x.split(/\n/));
}
usageDemo.compact(dumpInspect);
return output;
};
usageDemo.expectedOutput = (function () {
var expected = [];
String(usageDemo).replace(/\n\s*\/{2}=\s*`([ -\uFFFF]*)`(?=\n)/g,
function (m, exln) { expected.push(m && exln); });
return expected;
}());
usageDemo.compare = function (cmp) {
return cmp(usageDemo.capture(), usageDemo.expectedOutput);
};
module.exports = usageDemo;
if (require.main === module) { usageDemo.compact('log', console); }