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MagicString.js
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MagicString.js
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const assert = require('assert');
const SourceMapConsumer = require('source-map-js').SourceMapConsumer;
const MagicString = require('./utils/IntegrityCheckingMagicString');
require('source-map-support').install();
describe('MagicString', () => {
describe('options', () => {
it('stores source file information', () => {
const s = new MagicString('abc', {
filename: 'foo.js'
});
assert.equal(s.filename, 'foo.js');
});
});
describe('append', () => {
it('should append content', () => {
const s = new MagicString('abcdefghijkl');
s.append('xyz');
assert.equal(s.toString(), 'abcdefghijklxyz');
s.append('xyz');
assert.equal(s.toString(), 'abcdefghijklxyzxyz');
});
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.append('xyz'), s);
});
it('should throw when given non-string content', () => {
const s = new MagicString('');
assert.throws(() => s.append([]), TypeError);
});
});
describe('(ap|pre)pend(Left|Right)', () => {
it('preserves intended order', () => {
const s = new MagicString('0123456789');
s.appendLeft(5, 'A');
s.prependRight(5, 'a');
s.prependRight(5, 'b');
s.appendLeft(5, 'B');
s.appendLeft(5, 'C');
s.prependRight(5, 'c');
assert.equal(s.toString(), '01234ABCcba56789');
assert.equal(s.slice(0, 5), '01234ABC');
assert.equal(s.slice(5), 'cba56789');
s.prependLeft(5, '<');
s.prependLeft(5, '{');
assert.equal(s.toString(), '01234{<ABCcba56789');
s.appendRight(5, '>');
s.appendRight(5, '}');
assert.equal(s.toString(), '01234{<ABCcba>}56789');
s.appendLeft(5, '(');
s.appendLeft(5, '[');
assert.equal(s.toString(), '01234{<ABC([cba>}56789');
s.prependRight(5, ')');
s.prependRight(5, ']');
assert.equal(s.toString(), '01234{<ABC([])cba>}56789');
assert.equal(s.slice(0, 5), '01234{<ABC([');
assert.equal(s.slice(5), '])cba>}56789');
});
it('preserves intended order at beginning of string', () => {
const s = new MagicString('x');
s.appendLeft(0, '1');
s.prependLeft(0, '2');
s.appendLeft(0, '3');
s.prependLeft(0, '4');
assert.equal(s.toString(), '4213x');
});
it('preserves intended order at end of string', () => {
const s = new MagicString('x');
s.appendRight(1, '1');
s.prependRight(1, '2');
s.appendRight(1, '3');
s.prependRight(1, '4');
assert.equal(s.toString(), 'x4213');
});
});
describe('appendLeft', () => {
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.appendLeft(0, 'a'), s);
});
});
describe('appendRight', () => {
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.appendRight(0, 'a'), s);
});
});
describe('clone', () => {
it('should clone a magic string', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(3, 9, 'XYZ');
const c = s.clone();
assert.notEqual(s, c);
assert.equal(c.toString(), 'abcXYZjkl');
});
it('should clone filename info', () => {
const s = new MagicString('abcdefghijkl', { filename: 'foo.js' });
const c = s.clone();
assert.equal(c.filename, 'foo.js');
});
it('should clone indentExclusionRanges', () => {
const array = [3, 6];
const source = new MagicString('abcdefghijkl', {
filename: 'foo.js',
indentExclusionRanges: array
});
const clone = source.clone();
assert.notStrictEqual(source.indentExclusionRanges, clone.indentExclusionRanges);
assert.deepEqual(source.indentExclusionRanges, clone.indentExclusionRanges);
});
it('should clone complex indentExclusionRanges', () => {
const array = [[3, 6], [7, 9]];
const source = new MagicString('abcdefghijkl', {
filename: 'foo.js',
indentExclusionRanges: array
});
const clone = source.clone();
assert.notStrictEqual(source.indentExclusionRanges, clone.indentExclusionRanges);
assert.deepEqual(source.indentExclusionRanges, clone.indentExclusionRanges);
});
it('should clone sourcemapLocations', () => {
const source = new MagicString('abcdefghijkl', {
filename: 'foo.js'
});
source.addSourcemapLocation(3);
const clone = source.clone();
assert.notStrictEqual(source.sourcemapLocations, clone.sourcemapLocations);
assert.deepEqual(source.sourcemapLocations, clone.sourcemapLocations);
});
it('should clone intro and outro', () => {
const source = new MagicString('defghi');
source.prepend('abc');
source.append('jkl');
const clone = source.clone();
assert.equal(source.toString(), clone.toString());
});
});
describe('generateMap', () => {
it('should generate a sourcemap', () => {
const s = new MagicString('abcdefghijkl').remove(3, 9);
const map = s.generateMap({
file: 'output.md',
source: 'input.md',
includeContent: true,
hires: true
});
assert.equal(map.version, 3);
assert.equal(map.file, 'output.md');
assert.deepEqual(map.sources, ['input.md']);
assert.deepEqual(map.sourcesContent, ['abcdefghijkl']);
assert.equal(map.mappings, 'AAAA,CAAC,CAAC,CAAO,CAAC,CAAC');
assert.equal(map.toString(), '{"version":3,"file":"output.md","sources":["input.md"],"sourcesContent":["abcdefghijkl"],"names":[],"mappings":"AAAA,CAAC,CAAC,CAAO,CAAC,CAAC"}');
assert.equal(map.toUrl(), 'data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoib3V0cHV0Lm1kIiwic291cmNlcyI6WyJpbnB1dC5tZCJdLCJzb3VyY2VzQ29udGVudCI6WyJhYmNkZWZnaGlqa2wiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUEsQ0FBQyxDQUFDLENBQU8sQ0FBQyxDQUFDIn0=');
const smc = new SourceMapConsumer(map);
let loc;
loc = smc.originalPositionFor({ line: 1, column: 0 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 0);
loc = smc.originalPositionFor({ line: 1, column: 1 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 1);
loc = smc.originalPositionFor({ line: 1, column: 4 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 10);
});
it('should generate a correct sourcemap for prepend content when hires = false', () => {
const s = new MagicString('x\nq');
s.prepend('y\n');
const map = s.generateMap({
includeContent: true,
});
assert.equal(map.mappings,';AAAA;AACA');
});
it('should generate a correct sourcemap for indented content', () => {
const s = new MagicString('var answer = 42;\nconsole.log("the answer is %s", answer);');
s.prepend('\'use strict\';\n\n');
s.indent('\t').prepend('(function () {\n').append('\n}).call(global);');
const map = s.generateMap({
source: 'input.md',
includeContent: true,
hires: true
});
const smc = new SourceMapConsumer(map);
const originLoc = smc.originalPositionFor({ line: 5, column: 1 });
assert.equal(originLoc.line, 2);
assert.equal(originLoc.column, 0);
});
it('should generate a sourcemap using specified locations', () => {
const s = new MagicString('abcdefghijkl');
s.addSourcemapLocation(0);
s.addSourcemapLocation(3);
s.addSourcemapLocation(10);
s.remove(6, 9);
const map = s.generateMap({
file: 'output.md',
source: 'input.md',
includeContent: true
});
assert.equal(map.version, 3);
assert.equal(map.file, 'output.md');
assert.deepEqual(map.sources, ['input.md']);
assert.deepEqual(map.sourcesContent, ['abcdefghijkl']);
assert.equal(map.toString(), '{"version":3,"file":"output.md","sources":["input.md"],"sourcesContent":["abcdefghijkl"],"names":[],"mappings":"AAAA,GAAG,GAAM,CAAC"}');
assert.equal(map.toUrl(), 'data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoib3V0cHV0Lm1kIiwic291cmNlcyI6WyJpbnB1dC5tZCJdLCJzb3VyY2VzQ29udGVudCI6WyJhYmNkZWZnaGlqa2wiXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IkFBQUEsR0FBRyxHQUFNLENBQUMifQ==');
const smc = new SourceMapConsumer(map);
let loc;
loc = smc.originalPositionFor({ line: 1, column: 0 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 0);
loc = smc.originalPositionFor({ line: 1, column: 3 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 3);
loc = smc.originalPositionFor({ line: 1, column: 7 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 10);
});
it('should correctly map inserted content', () => {
const s = new MagicString('function Foo () {}');
s.overwrite(9, 12, 'Bar');
const map = s.generateMap({
file: 'output.js',
source: 'input.js',
includeContent: true
});
const smc = new SourceMapConsumer(map);
const loc = smc.originalPositionFor({ line: 1, column: 9 });
assert.equal(loc.line, 1);
assert.equal(loc.column, 9);
});
it('should yield consistent results between appendLeft and prependRight', () => {
const s1 = new MagicString('abcdefghijkl');
s1.appendLeft(6, 'X');
const s2 = new MagicString('abcdefghijkl');
s2.prependRight(6, 'X');
const m1 = s1.generateMap({ file: 'output', source: 'input', includeContent: true });
const m2 = s2.generateMap({ file: 'output', source: 'input', includeContent: true });
assert.deepEqual(m1, m2);
});
it('should recover original names', () => {
const s = new MagicString('function Foo () {}');
s.overwrite(9, 12, 'Bar', { storeName: true });
const map = s.generateMap({
file: 'output.js',
source: 'input.js',
includeContent: true
});
const smc = new SourceMapConsumer(map);
const loc = smc.originalPositionFor({ line: 1, column: 9 });
assert.equal(loc.name, 'Foo');
});
it('should generate one segment per replacement', () => {
const s = new MagicString('var answer = 42');
s.overwrite(4, 10, 'number', { storeName: true });
const map = s.generateMap({
file: 'output.js',
source: 'input.js',
includeContent: true
});
const smc = new SourceMapConsumer(map);
let numMappings = 0;
smc.eachMapping(() => numMappings += 1);
assert.equal(numMappings, 3); // one at 0, one at the edit, one afterwards
});
it('should generate a sourcemap that correctly locates moved content', () => {
const s = new MagicString('abcdefghijkl');
s.move(3, 6, 9);
const result = s.toString();
const map = s.generateMap({
file: 'output.js',
source: 'input.js',
includeContent: true,
hires: true
});
const smc = new SourceMapConsumer(map);
'abcdefghijkl'.split('').forEach((letter, i) => {
const column = result.indexOf(letter);
const loc = smc.originalPositionFor({ line: 1, column });
assert.equal(loc.line, 1);
assert.equal(loc.column, i);
});
});
it('generates a map with trimmed content (#53)', () => {
const s1 = new MagicString('abcdefghijkl ').trim();
const map1 = s1.generateMap({
file: 'output',
source: 'input',
includeContent: true,
hires: true
});
const smc1 = new SourceMapConsumer(map1);
const loc1 = smc1.originalPositionFor({ line: 1, column: 11 });
assert.equal(loc1.column, 11);
const s2 = new MagicString(' abcdefghijkl').trim();
const map2 = s2.generateMap({
file: 'output',
source: 'input',
includeContent: true,
hires: true
});
const smc2 = new SourceMapConsumer(map2);
const loc2 = smc2.originalPositionFor({ line: 1, column: 1 });
assert.equal(loc2.column, 2);
});
it('skips empty segments at the start', () => {
const s = new MagicString('abcdefghijkl');
s.remove(0, 3).remove(3, 6);
const map = s.generateMap();
const smc = new SourceMapConsumer(map);
const loc = smc.originalPositionFor({ line: 1, column: 6 });
assert.equal(loc.column, 6);
});
it('skips indentation at the start', () => {
const s = new MagicString('abcdefghijkl');
s.indent(' ');
const map = s.generateMap();
assert.equal(map.mappings, 'IAAA');
});
});
describe('getIndentString', () => {
it('should guess the indent string', () => {
const s = new MagicString('abc\n def\nghi');
assert.equal(s.getIndentString(), ' ');
});
it('should return a tab if no lines are indented', () => {
const s = new MagicString('abc\ndef\nghi');
assert.equal(s.getIndentString(), '\t');
});
});
describe('indent', () => {
it('should indent content with a single tab character by default', () => {
const s = new MagicString('abc\ndef\nghi\njkl');
s.indent();
assert.equal(s.toString(), '\tabc\n\tdef\n\tghi\n\tjkl');
s.indent();
assert.equal(s.toString(), '\t\tabc\n\t\tdef\n\t\tghi\n\t\tjkl');
});
it('should indent content, using existing indentation as a guide', () => {
const s = new MagicString('abc\n def\n ghi\n jkl');
s.indent();
assert.equal(s.toString(), ' abc\n def\n ghi\n jkl');
s.indent();
assert.equal(s.toString(), ' abc\n def\n ghi\n jkl');
});
it('should disregard single-space indentation when auto-indenting', () => {
const s = new MagicString('abc\n/**\n *comment\n */');
s.indent();
assert.equal(s.toString(), '\tabc\n\t/**\n\t *comment\n\t */');
});
it('should indent content using the supplied indent string', () => {
const s = new MagicString('abc\ndef\nghi\njkl');
s.indent(' ');
assert.equal(s.toString(), ' abc\n def\n ghi\n jkl');
s.indent('>>');
assert.equal(s.toString(), '>> abc\n>> def\n>> ghi\n>> jkl');
});
it('should indent content using the empty string if specified (i.e. noop)', () => {
const s = new MagicString('abc\ndef\nghi\njkl');
s.indent('');
assert.equal(s.toString(), 'abc\ndef\nghi\njkl');
});
it('should prevent excluded characters from being indented', () => {
const s = new MagicString('abc\ndef\nghi\njkl');
s.indent(' ', { exclude: [7, 15] });
assert.equal(s.toString(), ' abc\n def\nghi\njkl');
s.indent('>>', { exclude: [7, 15] });
assert.equal(s.toString(), '>> abc\n>> def\nghi\njkl');
});
it('should not add characters to empty lines', () => {
const s = new MagicString('\n\nabc\ndef\n\nghi\njkl');
s.indent();
assert.equal(s.toString(), '\n\n\tabc\n\tdef\n\n\tghi\n\tjkl');
s.indent();
assert.equal(s.toString(), '\n\n\t\tabc\n\t\tdef\n\n\t\tghi\n\t\tjkl');
});
it('should not add characters to empty lines, even on Windows', () => {
const s = new MagicString('\r\n\r\nabc\r\ndef\r\n\r\nghi\r\njkl');
s.indent();
assert.equal(s.toString(), '\r\n\r\n\tabc\r\n\tdef\r\n\r\n\tghi\r\n\tjkl');
s.indent();
assert.equal(s.toString(), '\r\n\r\n\t\tabc\r\n\t\tdef\r\n\r\n\t\tghi\r\n\t\tjkl');
});
it('should indent content with removals', () => {
const s = new MagicString('/* remove this line */\nvar foo = 1;');
s.remove(0, 23);
s.indent();
assert.equal(s.toString(), '\tvar foo = 1;');
});
it('should not indent patches in the middle of a line', () => {
const s = new MagicString('class Foo extends Bar {}');
s.overwrite(18, 21, 'Baz');
assert.equal(s.toString(), 'class Foo extends Baz {}');
s.indent();
assert.equal(s.toString(), '\tclass Foo extends Baz {}');
});
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.indent(), s);
});
it('should return this on noop', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.indent(''), s);
});
});
describe('insert', () => {
it('is deprecated', () => {
const s = new MagicString('abcdefghijkl');
assert.throws(() => s.insert(6, 'X'), /deprecated/);
});
// TODO move this into prependRight and appendLeft tests
// it( 'should insert characters in the correct location', () => {
// const s = new MagicString( 'abcdefghijkl' );
//
// s.insert( 0, '>>>' );
// s.insert( 6, '***' );
// s.insert( 12, '<<<' );
//
// assert.equal( s.toString(), '>>>abcdef***ghijkl<<<' );
// });
//
// it( 'should return this', () => {
// const s = new MagicString( 'abcdefghijkl' );
// assert.strictEqual( s.insert( 0, 'a' ), s );
// });
//
// it( 'should insert repeatedly at the same position correctly', () => {
// const s = new MagicString( 'ab' );
// assert.equal( s.insert(1, '1').toString(), 'a1b' );
// assert.equal( s.insert(1, '2').toString(), 'a12b' );
// });
//
// it( 'should insert repeatedly at the beginning correctly', () => {
// const s = new MagicString( 'ab' );
// assert.equal( s.insert(0, '1').toString(), '1ab' );
// assert.equal( s.insert(0, '2').toString(), '12ab' );
// });
//
// it( 'should throw when given non-string content', () => {
// const s = new MagicString( '' );
// assert.throws(
// function () { s.insert( 0, [] ); },
// TypeError
// );
// });
//
// it( 'should allow inserting after removed range', () => {
// const s = new MagicString( 'abcd' );
// s.remove( 1, 2 );
// s.insert( 2, 'z' );
// assert.equal( s.toString(), 'azcd' );
// });
});
describe('move', () => {
it('moves content from the start', () => {
const s = new MagicString('abcdefghijkl');
s.move(0, 3, 6);
assert.equal(s.toString(), 'defabcghijkl');
});
it('moves content to the start', () => {
const s = new MagicString('abcdefghijkl');
s.move(3, 6, 0);
assert.equal(s.toString(), 'defabcghijkl');
});
it('moves content from the end', () => {
const s = new MagicString('abcdefghijkl');
s.move(9, 12, 6);
assert.equal(s.toString(), 'abcdefjklghi');
});
it('moves content to the end', () => {
const s = new MagicString('abcdefghijkl');
s.move(6, 9, 12);
assert.equal(s.toString(), 'abcdefjklghi');
});
it('ignores redundant move', () => {
const s = new MagicString('abcdefghijkl');
s.prependRight(9, 'X');
s.move(9, 12, 6);
s.appendLeft(12, 'Y');
s.move(6, 9, 12); // this is redundant – [6,9] is already after [9,12]
assert.equal(s.toString(), 'abcdefXjklYghi');
});
it('moves content to the middle', () => {
const s = new MagicString('abcdefghijkl');
s.move(3, 6, 9);
assert.equal(s.toString(), 'abcghidefjkl');
});
it('handles multiple moves of the same snippet', () => {
const s = new MagicString('abcdefghijkl');
s.move(0, 3, 6);
assert.equal(s.toString(), 'defabcghijkl');
s.move(0, 3, 9);
assert.equal(s.toString(), 'defghiabcjkl');
});
it('handles moves of adjacent snippets', () => {
const s = new MagicString('abcdefghijkl');
s.move(0, 2, 6);
assert.equal(s.toString(), 'cdefabghijkl');
s.move(2, 4, 6);
assert.equal(s.toString(), 'efabcdghijkl');
});
it('handles moves to same index', () => {
const s = new MagicString('abcdefghijkl');
s.move(0, 2, 6).move(3, 5, 6);
assert.equal(s.toString(), 'cfabdeghijkl');
});
it('refuses to move a selection to inside itself', () => {
const s = new MagicString('abcdefghijkl');
assert.throws(() => s.move(3, 6, 3), /Cannot move a selection inside itself/);
assert.throws(() => s.move(3, 6, 4), /Cannot move a selection inside itself/);
assert.throws(() => s.move(3, 6, 6), /Cannot move a selection inside itself/);
});
it('allows edits of moved content', () => {
const s1 = new MagicString('abcdefghijkl');
s1.move(3, 6, 9);
s1.overwrite(3, 6, 'DEF');
assert.equal(s1.toString(), 'abcghiDEFjkl');
const s2 = new MagicString('abcdefghijkl');
s2.move(3, 6, 9);
s2.overwrite(4, 5, 'E');
assert.equal(s2.toString(), 'abcghidEfjkl');
});
// it( 'move follows inserts', () => {
// const s = new MagicString( 'abcdefghijkl' );
//
// s.appendLeft( 3, 'X' ).move( 6, 9, 3 );
// assert.equal( s.toString(), 'abcXghidefjkl' );
// });
//
// it( 'inserts follow move', () => {
// const s = new MagicString( 'abcdefghijkl' );
//
// s.insert( 3, 'X' ).move( 6, 9, 3 ).insert( 3, 'Y' );
// assert.equal( s.toString(), 'abcXghiYdefjkl' );
// });
//
// it( 'discards inserts at end of move by default', () => {
// const s = new MagicString( 'abcdefghijkl' );
//
// s.insert( 6, 'X' ).move( 3, 6, 9 );
// assert.equal( s.toString(), 'abcXghidefjkl' );
// });
it('moves content inserted at end of range', () => {
const s = new MagicString('abcdefghijkl');
s.appendLeft(6, 'X').move(3, 6, 9);
assert.equal(s.toString(), 'abcghidefXjkl');
});
it('returns this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.move(3, 6, 9), s);
});
});
describe('overwrite', () => {
it('should replace characters', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(5, 8, 'FGH');
assert.equal(s.toString(), 'abcdeFGHijkl');
});
it('should throw an error if overlapping replacements are attempted', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(7, 11, 'xx');
assert.throws(() => s.overwrite(8, 12, 'yy'), /Cannot split a chunk that has already been edited/);
assert.equal(s.toString(), 'abcdefgxxl');
s.overwrite(6, 12, 'yes');
assert.equal(s.toString(), 'abcdefyes');
});
it('should allow contiguous but non-overlapping replacements', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(3, 6, 'DEF');
assert.equal(s.toString(), 'abcDEFghijkl');
s.overwrite(6, 9, 'GHI');
assert.equal(s.toString(), 'abcDEFGHIjkl');
s.overwrite(0, 3, 'ABC');
assert.equal(s.toString(), 'ABCDEFGHIjkl');
s.overwrite(9, 12, 'JKL');
assert.equal(s.toString(), 'ABCDEFGHIJKL');
});
it('does not replace zero-length inserts at overwrite start location', () => {
const s = new MagicString('abcdefghijkl');
s.remove(0, 6);
s.appendLeft(6, 'DEF');
s.overwrite(6, 9, 'GHI');
assert.equal(s.toString(), 'DEFGHIjkl');
});
it('replaces zero-length inserts inside overwrite', () => {
const s = new MagicString('abcdefghijkl');
s.appendLeft(6, 'XXX');
s.overwrite(3, 9, 'DEFGHI');
assert.equal(s.toString(), 'abcDEFGHIjkl');
});
it('replaces non-zero-length inserts inside overwrite', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(3, 4, 'XXX');
s.overwrite(3, 5, 'DE');
assert.equal(s.toString(), 'abcDEfghijkl');
s.overwrite(7, 8, 'YYY');
s.overwrite(6, 8, 'GH');
assert.equal(s.toString(), 'abcDEfGHijkl');
});
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.overwrite(3, 4, 'D'), s);
});
it('should disallow overwriting zero-length ranges', () => {
const s = new MagicString('x');
assert.throws(() => s.overwrite(0, 0, 'anything'), /Cannot overwrite a zero-length range – use appendLeft or prependRight instead/);
});
it('should throw when given non-string content', () => {
const s = new MagicString('');
assert.throws(() => s.overwrite(0, 1, []), TypeError);
});
it('replaces interior inserts', () => {
const s = new MagicString('abcdefghijkl');
s.appendLeft(1, '&');
s.prependRight(1, '^');
s.appendLeft(3, '!');
s.prependRight(3, '?');
s.overwrite(1, 3, '...');
assert.equal(s.toString(), 'a&...?defghijkl');
});
it('preserves interior inserts with `contentOnly: true`', () => {
const s = new MagicString('abcdefghijkl');
s.appendLeft(1, '&');
s.prependRight(1, '^');
s.appendLeft(3, '!');
s.prependRight(3, '?');
s.overwrite(1, 3, '...', { contentOnly: true });
assert.equal(s.toString(), 'a&^...!?defghijkl');
});
it('disallows overwriting partially overlapping moved content', () => {
const s = new MagicString('abcdefghijkl');
s.move(6, 9, 3);
assert.throws(() => s.overwrite(5, 7, 'XX'), /Cannot overwrite across a split point/);
});
it('disallows overwriting fully surrounding content moved away', () => {
const s = new MagicString('abcdefghijkl');
s.move(6, 9, 3);
assert.throws(() => s.overwrite(4, 11, 'XX'), /Cannot overwrite across a split point/);
});
it('disallows overwriting fully surrounding content moved away even if there is another split', () => {
const s = new MagicString('abcdefghijkl');
s.move(6, 9, 3);
s.appendLeft(5, 'foo');
assert.throws(() => s.overwrite(4, 11, 'XX'), /Cannot overwrite across a split point/);
});
it('allows later insertions at the end', () => {
const s = new MagicString('abcdefg');
s.appendLeft(4, '(');
s.overwrite(2, 7, '');
s.appendLeft(7, 'h');
assert.equal(s.toString(), 'abh');
});
});
describe('prepend', () => {
it('should prepend content', () => {
const s = new MagicString('abcdefghijkl');
s.prepend('xyz');
assert.equal(s.toString(), 'xyzabcdefghijkl');
s.prepend('123');
assert.equal(s.toString(), '123xyzabcdefghijkl');
});
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.prepend('xyz'), s);
});
});
describe('prependLeft', () => {
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.prependLeft(0, 'a'), s);
});
});
describe('prependRight', () => {
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.prependRight(0, 'a'), s);
});
});
describe('remove', () => {
it('should remove characters from the original string', () => {
const s = new MagicString('abcdefghijkl');
s.remove(1, 5);
assert.equal(s.toString(), 'afghijkl');
s.remove(9, 12);
assert.equal(s.toString(), 'afghi');
});
it('should remove from the start', () => {
const s = new MagicString('abcdefghijkl');
s.remove(0, 6);
assert.equal(s.toString(), 'ghijkl');
});
it('should remove from the end', () => {
const s = new MagicString('abcdefghijkl');
s.remove(6, 12);
assert.equal(s.toString(), 'abcdef');
});
it('should treat zero-length removals as a no-op', () => {
const s = new MagicString('abcdefghijkl');
s.remove(0, 0).remove(6, 6).remove(9, -3);
assert.equal(s.toString(), 'abcdefghijkl');
});
it('should remove overlapping ranges', () => {
const s1 = new MagicString('abcdefghijkl');
s1.remove(3, 7).remove(5, 9);
assert.equal(s1.toString(), 'abcjkl');
const s2 = new MagicString('abcdefghijkl');
s2.remove(3, 7).remove(4, 6);
assert.equal(s2.toString(), 'abchijkl');
});
it('should remove overlapping ranges, redux', () => {
const s = new MagicString('abccde');
s.remove(2, 3); // c
s.remove(1, 3); // bc
assert.equal(s.toString(), 'acde');
});
it('should remove modified ranges', () => {
const s = new MagicString('abcdefghi');
s.overwrite(3, 6, 'DEF');
s.remove(2, 7); // cDEFg
assert.equal(s.slice(1, 8), 'bh');
assert.equal(s.toString(), 'abhi');
});
it('should not remove content inserted after the end of removed range', () => {
const s = new MagicString('ab.c;');
s.prependRight(0, '(');
s.prependRight(4, ')');
s.remove(2, 4);
assert.equal(s.toString(), '(ab);');
});
it('should remove interior inserts', () => {
const s = new MagicString('abc;');
s.appendLeft(1, '[');
s.prependRight(1, '(');
s.appendLeft(2, ')');
s.prependRight(2, ']');
s.remove(1, 2);
assert.equal(s.toString(), 'a[]c;');
});
it('should provide a useful error when illegal removals are attempted', () => {
const s = new MagicString('abcdefghijkl');
s.overwrite(5, 7, 'XX');
assert.throws(() => s.remove(4, 6), /Cannot split a chunk that has already been edited/);
});
it('should return this', () => {
const s = new MagicString('abcdefghijkl');
assert.strictEqual(s.remove(3, 4), s);
});
it('removes across moved content', () => {
const s = new MagicString('abcdefghijkl');
s.move(6, 9, 3);
s.remove(5, 7);
assert.equal(s.toString(), 'abchidejkl');
});
});
describe('slice', () => {
it('should return the generated content between the specified original characters', () => {
const s = new MagicString('abcdefghijkl');
assert.equal(s.slice(3, 9), 'defghi');
s.overwrite(4, 8, 'XX');
assert.equal(s.slice(3, 9), 'dXXi');