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+# Change Log
+All notable changes to this project will be documented in this file.
+Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
+
+## [0.19.3] - 2019-06-18
+
+### Fixed
+
+ - Fixed bug where elements with content of `"0"` wouldn't be rendered (#376)
+
+## [0.19.2] - 2019-05-19
+
+### Fixed
+
+ - Fixed bug where default values for nested configuration paths were inadvertently cast to strings
+
+## [0.19.1] - 2019-04-10
+
+### Added
+
+ - Added the missing `addExtension()` method to the new `ConfigurableEnvironmentInterface`
+
+### Fixed
+
+ - Fixed extensions not being able to register other extensions
+
+## [0.19.0] - 2019-04-10
+
+### Added
+
+ - The priority of parsers, processors, and renderers can now be set when `add()`ing them; you no longer need to rely on the order in which they are added
+ - Added support for trying multiple parsers per block/inline
+ - Extracted two new base interfaces from `Environment`:
+   - `EnvironmentInterface`
+   - `ConfigurableEnvironmentInterface`
+ - Extracted a new `AbstractStringContainerBlock` base class and corresponding `StringContainerInterface` from `AbstractBlock`
+ - Added `Cursor::getEncoding()` method
+ - Added `.phpstorm.meta.php` file for better IDE code completion
+ - Made some minor optimizations here and there
+
+### Changed
+
+ - Pretty much everything now has parameter and return types (#346)
+ - Attributes passed to `HtmlElement` will now be escaped by default
+ - `Environment` is now a `final` class
+ - `Environment::getBlockRendererForClass()` was replaced with `Environment::getBlockRenderersForClass()` (note the added `s`)
+ - `Environment::getInlineRendererForClass()` was replaced with `Environment::getInlineRenderersForClass()` (note the added `s`)
+ - The `Environment::get____()` methods now return an iterator instead of an array
+ - `Context::addBlock()` no longer returns the same block instance you passed into the method, as this served no useful purpose
+ - `RegexHelper::isEscapable()` no longer accepts `null` values
+ - `Node::replaceChildren()` now accepts any type of `iterable`, not just `array`s
+ - Some block elements now extend `AbstractStringContainerBlock` instead of `AbstractBlock`
+   - `InlineContainerInterface` now extends the new `StringContainerInterface`
+   - The `handleRemainingContents()` method (formerly on `AbstractBlock`, now on `AbstractStringContainerBlock`) is now an `abstract method
+   - The `InlineParserContext` constructor now requires an `AbstractStringContainerBlock` instead of an `AbstractBlock`
+
+### Removed
+
+ - Removed support for PHP 5.6 and 7.0 (#346)
+ - Removed support for `add()`ing parsers with just the target block/inline class name - you need to include the full namespace now
+ - Removed the following unused methods from `Environment`:
+   - `getInlineParser($name)`
+   - `getInlineParsers()`
+   - `createInlineParserEngine()`
+ - Removed the unused `getName()` methods:
+   - `AbstractBlockParser::getName()`
+   - `AbstractInlineParser::getName()`
+   - `BlockParserInterface::getName()`
+   - `InlinerParserInterface::getName()`
+ - Removed the now-useless classes:
+   - `AbstractBlockParser`
+   - `AbstractInlinerParser`
+   - `InlineContainer`
+ - Removed the `AbstractBlock::acceptsLines()` method
+ - Removed the now-useless constructor from `AbstractBlock`
+ - Removed previously-deprecated functionality:
+   - `InlineContainer` class
+   - `RegexHelper::$instance`
+   - `RegexHelper::getInstance()`
+   - `RegexHelper::getPartialRegex()`
+   - `RegexHelper::getHtmlTagRegex()`
+   - `RegexHelper::getLinkTitleRegex()`
+   - `RegexHelper::getLinkDestinationBracesRegex()`
+   - `RegexHelper::getThematicBreakRegex()`
+ - Removed the second `$preserveEntities` parameter from `Xml:escape()`
+
+## [0.18.5] - 2019-03-28
+
+### Fixed
+
+ - Fixed the adjoining `Text` collapser not handling the full tree (thephpleague/commonmark-ext-autolink#10)
+
+## [0.18.4] - 2019-03-23
+
+### Changed
+
+ - Modified how URL normalization decodes certain characters in order to align with the JS library's output
+ - Disallowed unescaped `(` in parenthesized link title
+
+### Fixed
+
+ - Fixed two exponential backtracking issues
+
+## [0.18.3] - 2019-03-21
+
+This is a **security update** release.
+
+### Changed
+
+ - XML/HTML entities in attributes will no longer be preserved when rendering (#353)
+
+### Fixed
+
+ - Fix XSS vulnerability caused by improper preservation of entities when rendering (#353)
+
+### Deprecated
+
+ - Deprecated the `$preserveEntites` argument of `Xml::escape()` for removal in the next release (#353)
+
+## [0.18.2] - 2019-03-16
+
+### Fixed
+
+ - Fixed adjoining `Text` elements not being collapsed after delimiter processing
+
+### Deprecated
+
+ - Deprecated the `CommonmarkConverter::VERSION` constant for removal in 1.0.0
+
+## [0.18.1] - 2018-12-29
+
+This is a **security update** release.
+
+### Fixed
+
+ - Fix XSS vulnerability caused by URL normalization not handling/encoding newlines properly (#337, CVE-2018-20583)
+
+## [0.18.0] - 2018-09-18
+
+### Added
+
+ - Added `ConverterInterface` to `Converter` and `CommonMarkConverter` (#330)
+ - Added `ListItem::getListData()` method (#329)
+
+### Changed
+
+ - Links with `target="_blank"` will also get `rel="noopener noreferrer"` by default (#331)
+ - Implemented several performance optimizations (#324)
+
+## [0.17.5] - 2018-03-29
+
+### Fixed
+
+ - Fixed incorrect version constant value (again)
+ - Fixed release checklist to prevent the above from happening
+ - Fixed incorrect dates in CHANGELOG
+
+## [0.17.4] - 2018-03-28
+
+### Added
+
+ - Added `ListBlock::setTight()` method
+
+## [0.17.3] - 2018-03-26
+
+### Fixed
+
+ - Fixed incorrect version constant value
+
+## [0.17.2] - 2018-03-25
+
+### Added
+
+ - Added new `RegexHelper::isEscapable()` method
+
+### Fixed
+
+ - Fixed spec compliance bug where escaped spaces should not be allowed in link destinations
+
+## [0.17.1] - 2018-03-18
+
+### Added
+
+ - Added a new constant containing the current version: `CommonMarkConverter::VERSION` (#314)
+
+## [0.17.0] - 2017-12-30
+
+This release contains several breaking changes and a minimum PHP version bump - see <UPGRADE.md> for more details.
+
+### Added
+
+ - Added new `max_nesting_level` setting (#243)
+ - Added minor performance optimizations to `Cursor`
+
+### Changed
+
+ - Minimum PHP version is now 5.6.5.
+ - All full and partial regular expressions in `RegexHelper` are now defined as constants instead of being built on-the-fly.
+ - `Cursor::saveState()` now returns an `array` instead of a `CursorState` object.
+ - `Cursor::restoreState()` now accepts an `array` parameter instead of a `CursorState` object.
+ - Saving/restoring the Cursor state no longer tracks things that don't change (like the text content).
+ - `RegexHelper` is now `final`.
+ - References to `InlineContainer` changed to new `InlineContainerInterface` interface.
+ - `MiscExtension::addInlineParser()` and `MiscExtension::addBlockRenderer()` now return `$this` instead of nothing.
+
+### Fixed
+ - Fixed `Reference::normalizeReference()` not properly collapsing whitespace to a single space
+
+### Deprecated
+
+ - `RegexHelper::getInstance()` and all instance (non-static) methods have been deprecated.
+ - The `InlineContainer` interface has been deprecated. Use `InlineContainerInterface` instead.
+
+### Removed
+
+ - Removed support for PHP 5.4 and 5.5.
+ - Removed `CursorState` class
+ - Removed all previous deprecations:
+   - `Cursor::getFirstNonSpacePosition()`
+   - `Cursor::getFirstNonSpaceCharacter()`
+   - `Cursor::advanceWhileMatches()`
+   - `Cursor::advanceToFirstNonSpace()`
+   - `ElementRendererInterface::escape()`
+   - `HtmlRenderer::escape()`
+   - `RegexHelper::REGEX_UNICODE_WHITESPACE`
+   - `RegexHelper::getLinkDestinationRegex()`
+
+## [0.16.0] - 2017-10-30
+
+This release contains breaking changes, several performance improvements, and two deprecations:
+
+### Added
+
+ - Added new `Xml` utility class; moved HTML/XML escaping logic into there (see deprecations below)
+
+### Changed
+
+ - `Environment::getInlineParsersForCharacter()` now returns an empty array (instead of `null`) when no matching parsers are found
+ - Three utility classes are now marked `final`:
+   - `Html5Entities`
+   - `LinkParserHelper`
+   - `UrlEncoder`
+
+### Fixed
+
+ - Improved performance of several methods (for a 10% overall performance boost - #292)
+
+### Deprecated
+
+The following methods were deprecated and are scheduled for removal in 0.17.0 or 1.0.0 (whichever comes first).  See <UPGRADE.md> for more information.
+
+ - `Cursor::advanceWhileMatches()` deprecated; use `Cursor::match()` instead.
+ - `HtmlRenderer::escape()` deprecated; use `Xml::escape()` instead.
+
+### Removed
+
+ - Removed `DelimiterStack::findFirstMatchingOpener()` which was previously deprecated in 0.15.0
+
+## [0.15.7] - 2017-10-26
+
+### Fixed
+
+ - Improved performance of `Cursor::advanceBy()` (for a 16% performance boost)
+
+## [0.15.6] - 2017-08-08
+
+### Fixed
+
+ - Fixed URI normalization not properly encoding/decoding special characters in certain cases (#287)
+
+## [0.15.5] - 2017-08-05
+
+This release bumps spec compliance to 0.28 without breaking changes to the API.
+
+### Added
+
+ - Project is now tested against PHP 7.2
+
+### Changed
+
+ - Bumped CommonMark spec target to 0.28
+ - Changed internal implementation of `LinkParserHelper::parseLinkDestination()` to allow nested parens
+ - Changed precedence of strong/emph when both nestings are possible (rule 14)
+ - Allow tabs before and after ATX closing header
+
+### Fixed
+
+ - Fixed HTML type 6 block regex matching against `<pre>` (it shouldn't) and not matching `<iframe>` (it should)
+ - Fixed reference parser incorrectly handling escaped `]` characters
+ - Fixed "multiple of 3" delimiter run calculations
+
+### Deprecated
+
+An unused constant and static method were deprecated and will be removed in a future release.  See <UPGRADE.md> for more information.
+
+ - Deprecated `RegexHelper::REGEX_UNICODE_WHITESPACE` (no longer used)
+ - Deprecated `RegexHelper::getLinkDestinationRegex()` (no longer used)
+
+## [0.15.4] - 2017-05-09
+
+### Added
+
+ - Added new methods to `Cursor` (#280):
+   - `advanceToNextNonSpaceOrNewline()` - Identical replacement for the (now-deprecated) `advanceToFirstNonSpace()` method
+   - `advanceToNextNonSpaceOrTab()` - Similar replacement for `advanceToFirstNonSpace()` but with proper tab handling
+   - `getNextNonSpaceCharacter()` - Identical replacement for the (now-deprecated) `getFirstNonSpaceCharacter()` method
+   - `getNextNonSpacePosition()` - Identical replacement for the (now-deprecated) `getFirstNonSpacePosition()` method
+ - Added new method to `CursorState` (#280):
+   - `getNextNonSpaceCache()` - Identical replacement for the (now-deprecated) `getFirstNonSpaceCache()` method
+
+### Fixed
+
+ - Fixed duplicate characters in non-intended lines containing tabs (#279)
+
+### Deprecated
+
+**All deprecations listed here will be removed in a future 0.x release.** See [UPGRADE.md](UPGRADE.md) for instructions on preparing your code for the eventual removal of these methods.
+
+ - Deprecated `Cursor::advanceToFirstNonSpace()` (#280)
+   - Use `advanceToNextNonSpaceOrTab()` or `advanceToNextNonSpaceOrNewline()` instead, depending on your requirements
+ - Deprecated `Cursor::getFirstNonSpaceCharacter()` (#280)
+   - Use `Cursor::getNextNonSpaceCharacter()` instead
+ - Deprecated `Cursor::getFirstNonSpacePosition()` (#280)
+   - Use `Cursor::getNextNonSpacePosition()` instead
+ - Deprecated `CursorState::getFirstNonSpaceCache()` (#280)
+   - Use `CursorState::getNextNonSpaceCache()` instead
+
+## [0.15.3] - 2016-12-18
+
+### Fixed
+ - Allow inline parsers matching regex delimiter to be created (#271, #272)
+
+## [0.15.2] - 2016-11-22
+
+### Changed
+ - Bumped spec target version to 0.27 (#268)
+ - H2-H6 elements are now parsed as HTML block elements instead of HTML inlines
+
+### Fixed
+ - Fixed incomplete punctuation regex
+ - Fixed shortcut links not being allowed before a `(`
+ - Fixed distinction between Unicode whitespace and regular whitespace
+
+## [0.15.1] - 2016-11-08
+
+### Fixed
+ - Fixed setext heading underlines not allowing trailing tabs (#266)
+
+## [0.15.0] - 2016-09-14
+
+### Added
+ - Added preliminary support for PHP 7.1 (#259)
+ - Added more regression tests (#258, #260)
+
+### Changed
+ - Bumped spec target version to 0.26 (#260)
+ - The `CursorState` constructor requires an additional parameter (#258)
+ - Ordered lists cannot interupt a paragraph unless they start with `1` (#260)
+ - Blank list items cannot interupt a paragraph (#260)
+
+### Deprecated
+ - Deprecated `DelimiterStack::findFirstMatchingOpener()` - use `findMatchingOpener()` instead (#260)
+
+### Fixed
+ - Fixed tabs in ATX headers and thematic breaks (#260)
+ - Fixed issue where cursor state was not being restored properly (#258, #260)
+   - This fixed the lists-with-tabs regression reported in #258
+
+### Removed
+ - Removed an unnecessary check in `Cursor::advanceBy()` (#260)
+ - Removed the two-blanks-break-out-of-lists feature (#260)
+
+
+## [0.14.0] - 2016-07-02
+### Added
+ - The `safe` option is deprecated and replaced by 2 new options (#253, #255):
+   - `html_input` (`strip`, `allow` or `escape`): how to handle untrusted HTML input (the default is `strip` for BC reasons)
+   - `allow_unsafe_links` (`true` or `false`): whether to allow risky image URLs and links (the default is `true` for BC reasons)
+
+### Deprecated
+ - The `safe` option is now deprecated and will be removed in the 1.0.0 release.
+
+## [0.13.4] - 2016-06-14
+
+### Fixed
+ - Fixed path to `autoload.php` within bin/commonmark (#250)
+
+## [0.13.3] - 2016-05-21
+
+### Added
+ - Added `setUrl()` method for `Link` and `Image` elements (#227, #244)
+ - Added cebe/markdown to the benchmark tool (#245)
+
+## [0.13.2] - 2016-03-27
+
+### Added
+ - Added ability to invoke `Converter` as a function (#233, #239)
+ - Added new `advanceBySpaceOrTab` convenience method to `Cursor`
+
+### Changed
+ - Bumped spec target version to 0.25
+ - Adjusted how tabs are handled by the `Cursor` (#234)
+ - Made a couple small micro-optimizations to heavily used functions (#240)
+ - Updated URLs in docblocks to use HTTPS where possible (#238)
+
+## [0.13.1] - 2016-03-09
+
+### Changed
+ - Refactored `EmphasisParser::parse()` to simplify it (#223)
+ - Updated dev dependencies (#218 & #220)
+
+### Fixed
+ - Fixed invalid regex generated when no inline parsers are defined (#224)
+ - Fixed logic bug with blank line after empty list item (#230)
+ - Fixed some incorrect code comments
+
+### Removed
+ - Removed unused variables (#223)
+
+## [0.13.0] - 2016-01-13
+
+### Added
+ - Added AST document processors (#210)
+ - Added optional `Environment` parameter to `CommonMarkConverter` constructor
+
+### Changed
+ - Renamed "header" things to "heading" for spec consistency
+   - `Header` => `Heading`
+   - `ATXHeaderParser` => `ATXHeadingParser`
+   - `SetExtHeaderParser` => `SetExtHeadingParser`
+   - `HeaderRenderer` => `HeadingRenderer`
+ - Renamed "HorizontalRule" to "ThematicBreak" for spec consistency
+   - `HorizontalRule` => `ThematicBreak`
+   - `HorizontalRuleParser` => `ThematicBreakParser`
+   - `HorizontalRuleRenderer` => `ThematicBreakRenderer`
+   - `HorizontalRuleRendererTest` => `ThematicBreakRendererTest`
+   - `RegexHelper::getHRuleRegex()` => `RegexHelper::getThematicBreakRegex()`
+ - Renamed inline "Html" and "RawHtml" to "HtmlInline" for consistency
+   - `Html` => `HtmlInline`
+   - `RawHtmlParser` => `HtmlInlineParser`
+   - `RawHtmlRenderer` => `HtmlInlineRenderer`
+ - Don't allow whitespace between link text and link label of a reference link (spec change)
+ - Don't allow spaces in link destinations, even in `<>`
+ - Allow multiline setext header content
+   - The `Heading` constructor now allows `$contents` to be a `string` (old behavior) or `string[]` (new)
+
+### Fixed
+ - Fixed several list issues and regressions (jgm/commonmark.js#59)
+
+### Removed
+ - Removed schema whitelist from autolink regex
+ - Moved SmartPunct functionality into new [league/commonmark-extras](https://github.com/thephpleague/commonmark-extras) package
+
+## [0.12.0] - 2015-11-04
+
+### Added
+ - Added ability to configure characters and disable emphasis/strong (#135)
+ - Added new ConfigurationAwareInterface support for all parsers, processors, and renderers (#201)
+ - Added HTML safe mode to handle untrusted input (#200, #201)
+   - Safe mode is disabled by default for backwards-compatibility
+   - To enable it, set the `safe` option to `true`
+ - Added AppVeyor integration for automated unit/functional testing on Windows (#195)
+
+### Changed
+ - `AbstractBlock::finalize()` now requires a second parameter, `$endLineNumber`
+ - `RegexHelper::REGEX_ENTITY` no longer includes the starting `/` or the ending `/i` (#194)
+ - `Node::setParent()` now accepts null values (#203)
+
+### Fixed
+ - Fixed incorrect `endLine` positions (#187)
+ - Fixed `DocParser::preProcessInput` dropping up to 2 ending newlines instead of just one
+ - Fixed `EntityParser` not checking for ampersands at the start of the current position (#192, #194)
+
+### Removed
+ - Removed protected function Context::addChild()
+   - It was a duplicate of the Context::addBlock() method
+ - Disabled STDIN reading on `bin/commonmark` for Windows due to PHP issues (#189, #195)
+
+## [0.11.3] - 2015-09-25
+### Fixed
+ - Reset container after closing containing lists (#183; jgm/commonmark.js#67)
+   - The temporary fix from 0.11.2 was reverted
+
+## [0.11.2] - 2015-09-23
+### Fixed
+ - Fixed parser checking acceptsLines on the wrong element (#183)
+
+## [0.11.1] - 2015-09-22
+### Changed
+ - Tightened up some loose comparisons
+
+### Fixed
+ - Fixed missing "bin" directive in composer.json
+ - Updated a docblock to match recent changes to method parameters
+
+### Removed
+ - Removed unused variable from within QuoteProcessor's closure
+
+## [0.11.0] - 2015-09-19
+### Added
+ - Added new `Node` class, which both `AbstractBlock` and `AbstractInline` extend from (#169)
+ - Added a `NodeWalker` and `NodeWalkerEvent` to traverse the AST without using recursion
+ - Added new `InlineContainer` interface for blocks
+ - Added new `getContainer()` and `getReferenceMap()` methods to `InlineParserContext`
+ - Added `iframe` to whitelist of HTML block tags (as per spec)
+ - Added `./bin/commonmark` for converting Markdown at the command line
+
+### Changed
+ - Bumped spec target version to 0.22
+ - Revised AST to use a double-linked list (#169)
+ - `AbstractBlock` and `AbstractInline` both extend from `Node`
+   - Sub-classes must implement new `isContainer()` method
+ - Other major changes to `AbstractBlock`:
+   - `getParent()` is now `parent()`
+   - `setParent()` now expects a `Node` instead of an `AbstractBlock`
+   - `getChildren()` is now `children()`
+   - `getLastChild()` is now `lastChild()`
+   - `addChild()` is now `appendChild()`
+ - `InlineParserContext` is constructed using the container `AbstractBlock` and the document's `RefereceMap`
+   - The constructor will automatically create the `Cursor` using the container's string contents
+ - `InlineParserEngine::parse` now requires the `Node` container and the document's `ReferenceMap` instead of a `ContextInterface` and `Cursor`
+ - Changed `Delimiter` to reference the actual inline `Node` instead of the position
+   - The `int $pos` protected member and constructor arg is now `Node $node`
+   - Use `getInlineNode()` and `setInlineNode()` instead of `getPos()` and `setPos()`
+ - Changed `DocParser::processInlines` to use a `NodeWalker` to iterate through inlines
+   - Walker passed as second argument instead of `AbstractBlock`
+   - Uses a `while` loop instead of recursion to traverse the AST
+ - `Image` and `Link` now only accept a string as their second argument
+ - Refactored how `CloseBracketParser::parse()` works internally
+ - `CloseBracketParser::createInline` no longer accepts label inlines
+ - Disallow list item starting with multiple blank lines (see jgm/CommonMark#332)
+ - Modified `AbstractBlock::setLastLineBlank()`
+   - Functionality moved to `AbstractBlock::shouldLastLineBeBlank()` and new `DocParser::setAndPropagateLastLineBlank()` method
+   - `AbstractBlock::setLastLineBlank()` is now a setter method for `AbstractBlock::$lastLineBlank`
+ - `AbstractBlock::handleRemainingContents()` is no longer abstract
+   - A default implementation is provided
+   - Removed duplicate code from sub-classes which used the default implementation - they'll just use the parent method from now on
+
+### Fixed
+ - Fixed logic error in calculation of offset (see jgm/commonmark.js@94053a8)
+ - Fixed bug where `DocParser` checked the wrong method to determine remainder handling behavior
+ - Fixed bug where `HorizontalRuleParser` failed to advance the cursor beyond the parsed horizontal rule characters
+ - Fixed `DocParser` not ignoring the final newline of the input (like the reference parser does)
+
+### Removed
+ - Removed `Block\Element\AbstractInlineContainer`
+   - Extend `AbstractBlock` and implement `InlineContainer` instead
+   - Use child methods instead of `getInlines` and `setInlines`
+ - Removed `AbstractBlock::replaceChild()`
+   - Call `Node::replaceWith()` directly the child node instead
+ - Removed the `getInlines()` method from `InlineParserContext`
+   - Add parsed inlines using `$inlineContext->getContainer()->appendChild()` instead of `$inlineContext->getInlines()->add()`
+ - Removed the `ContextInterface` argument from `AbstractInlineParser::parse()` and `InlineParserEngine::parseCharacter`
+ - Removed the first `ArrayCollection $inlines` argument from `InlineProcessorInterface::processInlines()`
+ - Removed `CloseBracketParser::nullify()`
+ - Removed `pre` from rule 6 of HTML blocks (see jgm/CommonMark#355)
+
+## [0.10.0] - 2015-07-25
+### Added
+ - Added parent references to inline elements (#124)
+ - Added smart punctuation extension (#134)
+ - Added HTML block types
+ - Added indentation caching to the cursor
+ - Added automated code style checks (#133)
+ - Added support for tag attributes in renderers (#101, #165)
+
+### Changed
+ - Bumped spec target version to 0.21
+ - Revised HTML block parsing to conform to new spec (jgm/commonmark.js@99bd473)
+ - Imposed 9-digit limit on ordered list markers, per spec
+ - Allow non-initial hyphens in html tag names (jgm/CommonMark#239)
+ - Updated list of block tag names
+ - Changed tab/indentation handling to meet the new spec behavior
+ - Modified spec tests to show spaces and tabs in test results
+ - Replaced `HtmlRendererInterface` with `ElementRendererInterface` (#141)
+ - Removed the unnecessary `trim()` and string cast from `ListItemRenderer`
+
+### Fixed
+ - Fixed link reference definition edge case (#120)
+ - Allow literal (non-escaping) backslashes in link destinations (#118)
+ - Allow backslash-escaped backslashes in link labels (#119)
+ - Allow link labels up to 999 characters (per the spec)
+ - Properly split on whitespace when determining code block class (jgm/commonmark.js#54)
+ - Fixed code style issues (#132, #133, #151, #152)
+ - Fixed wording for invalid inline exception (#136)
+
+### Removed
+ - Removed the advance-by-one optimization due to added cursor complexity
+
+## [0.9.0] - 2015-06-18
+### Added
+ - Added public $data array to block elements (#95)
+ - Added `isIndented` helper method to `Cursor`
+ - Added a new `Converter` base class which `CommonMarkConverter` extends from (#105)
+
+### Changed
+ - Bumped spec target version to 0.20 (#112)
+ - Renamed ListBlock::$data and ListItem::$data to $listData
+ - Require link labels to contain non-whitespace (jgm/CommonMark#322)
+ - Use U+FFFD for entities resolving to 0 (jgm/CommonMark#323)
+ - Moved `IndentedCodeParser::CODE_INDENT_LEVEL` to `Cursor::INDENT_LEVEL`
+ - Changed arrays to short syntax (#116)
+ - Improved efficiency of DelimiterStack iteration (jgm/commonmark.js#43)
+
+### Fixed
+ - Fixed open block tag followed by newline not being recognized (jgm/CommonMark#324)
+ - Fixed indented lists sometimes being parsed incorrectly (jgm/commonmark.js#42)
+
+## [0.8.0] - 2015-04-29
+### Added
+ - Allow swapping built-in renderers without using their fully qualified names (#84)
+ - Lots of unit tests (for existing code)
+ - Ability to include arbitrary functional tests in addition to spec-based tests
+
+### Changed
+ - Dropped support for PHP 5.3 (#64 and #76)
+ - Bumped spec target version to 0.19
+ - Made the AbstractInlineContainer be abstract
+ - Moved environment config. logic into separate class
+
+### Fixed
+ - Fixed underscore emphasis to conform to spec changes (jgm/CommonMark#317)
+
+### Removed
+ - Removed PHP 5.3 workaround (see commit 5747822)
+ - Removed unused AbstractWebResource::setUrl() method
+ - Removed unnecessary check for hrule when parsing lists (#85)
+
+## [0.7.2] - 2015-03-08
+### Changed
+ - Bumped spec target version to 0.18
+
+### Fixed
+ - Fixed broken parsing of emphasized text ending with a '0' character (#81)
+
+## [0.7.1] - 2015-03-01
+### Added
+ - All references can now be obtained from the `ReferenceMap` via `listReferences()` (#73)
+ - Test against PHP 7.0 (nightly) but allow failures
+
+### Changed
+ - ListData::$start now defaults to null instead of 0 (#74)
+ - Replace references to HtmlRenderer with new HtmlRendererInterface
+
+### Fixed
+ - Fixed 0-based ordered lists starting at 1 instead of 0 (#74)
+ - Fixed errors parsing multi-byte characters (#78 and #79)
+
+## [0.7.0] - 2015-02-16
+### Added
+ - More unit tests to increase code coverage
+
+### Changed
+ - Enabled the InlineParserEngine to parse several non-special characters at once (performance boost)
+ - NewlineParser no longer attempts to parse spaces; look-behind is used instead (major performance boost)
+ - Moved closeUnmatchedBlocks into its own class
+ - Image and link elements now extend AbstractInlineContainer; label data is stored via $inlineContents instead
+ - Renamed AbstractInlineContainer::$inlineContents and its getter/setter
+
+### Removed
+ - Removed the InlineCollection class
+ - Removed the unused ArrayCollection::splice() method
+ - Removed impossible-to-reach code in Cursor::advanceToFirstNonSpace
+ - Removed unnecessary test from the InlineParserEngine
+ - Removed unnecessary/unused RegexHelper::getMainRegex() method
+
+## [0.6.1] - 2015-01-25
+### Changed
+ - Bumped spec target version to 0.17
+ - Updated emphasis parsing for underscores to prevent intra-word emphasis
+ - Deferred closing of fenced code blocks
+
+## [0.6.0] - 2015-01-09
+### Added
+ - Bulk registration of parsers/renderers via extensions (#45)
+ - Proper UTF-8 support, especially in the Cursor; mbstring extension is now required (#49)
+ - Environment is now configurable; options can be accessed in its parsers/renderers (#56)
+ - Added some unit tests
+
+### Changed
+ - Bumped spec target version to 0.15 (#50)
+ - Parsers/renderers are now lazy-initialized (#52)
+ - Some private elements are now protected for easier extending, especially on Element classes (#53)
+ - Renderer option keys changed from camelCase to underscore_case (#56)
+ - Moved CommonMark parser/render definitions into CommonMarkCoreExtension
+
+### Fixed
+ - Improved parsing of emphasis around punctuation
+ - Improved regexes for CDATA and HTML comments
+ - Fixed issue with HTML content that is considered false in loose comparisons, like `'0'` (#55)
+ - Fixed DocParser trying to add empty strings to closed containers (#58)
+ - Fixed incorrect use of a null parameter value in the HtmlElementTest
+
+### Removed
+ - Removed unused ReferenceDefinition* classes (#51)
+ - Removed UnicodeCaseFolder in favor of mb_strtoupper
+
+## [0.5.1] - 2014-12-27
+### Fixed
+ - Fixed infinite loop and link-in-link-in-image parsing (#37)
+
+### Removed
+ - Removed hard dependency on mbstring extension; workaround used if not installed (#38)
+
+## [0.5.0] - 2014-12-24
+### Added
+ - Support for custom directives, parsers, and renderers
+
+### Changed
+ - Major refactoring to de-couple directives from the parser, support custom directive functionality, and reduce complexity
+ - Updated references to stmd.js in README and docblocks
+ - Modified CHANGELOG formatting
+ - Improved travis configuration
+ - Put tests in autoload-dev
+
+### Fixed
+ - Fixed CommonMarkConverter re-creating object each time new text is converted (#26)
+
+### Removed
+ - Removed HtmlRenderer::render() (use the renderBlock method instead)
+ - Removed dependency on symfony/options-resolver (fixes #20)
+
+## [0.4.0] - 2014-12-15
+### Added
+ - Added some missing copyright info
+
+### Changed
+ - Changed namespace to League\CommonMark
+ - Made compatible with spec version 0.13
+ - Moved delimiter stack functionality into separate class
+
+### Fixed
+ - Fixed regex which caused HHVM tests to fail
+
+## [0.3.0] - 2014-11-28
+### Added
+ - Made renderer options configurable (issue #7)
+
+### Changed
+ - Made compatible with spec version 0.12
+ - Stack-based parsing now used for emphasis, links and images
+ - Protected some of the internal renderer methods which shouldn't have been `public`
+ - Minor code clean-up (including PSR-2 compliance)
+
+### Removed
+ - Removed unnecessary distinction between ATX and Setext headers
+
+## [0.2.1] - 2014-11-09
+### Added
+ - Added simpler string replacement to a method
+
+### Changed
+ - Removed "is" prefix from boolean methods
+ * Updated to latest version of PHPUnit
+ * Target specific spec version
+
+## [0.2.0] - 2014-11-09
+### Changed
+ - Mirrored significant changes and improvements from stmd.js
+ - Made compatible with spec version 0.10
+ - Updated location of JGM's repository
+ - Allowed HHVM tests to fail without affecting overall build success
+
+### Removed
+ - Removed composer.lock
+ - Removed fixed reference to jgm/stmd@0275f34
+
+## [0.1.2] - 2014-09-28
+### Added
+ - Added performance benchmarking tool (issue #2)
+ - Added more badges to the README
+
+### Changed
+ - Fix JS -> PHP null judgement (issue #4)
+ - Updated phpunit dependency
+
+## [0.1.1] - 2014-09-08
+### Added
+ - Add anchors to regexes
+
+### Changed
+ - Updated target spec (now compatible with jgm/stmd:spec.txt @ 2cf0750)
+ - Adjust HTML output for fenced code
+ - Adjust block-level tag regex (remove "br", add "iframe")
+ - Fix incorrect handling of nested emphasis
+
+## 0.1.0
+### Added
+ - Initial commit (compatible with jgm/stmd:spec.txt @ 0275f34)
+
+[0.19.3]: https://github.com/thephpleague/commonmark/compare/0.19.2...0.19.3
+[0.19.2]: https://github.com/thephpleague/commonmark/compare/0.19.1...0.19.2
+[0.19.1]: https://github.com/thephpleague/commonmark/compare/0.19.0...0.19.1
+[0.19.0]: https://github.com/thephpleague/commonmark/compare/0.18.5...0.19.0
+[0.18.5]: https://github.com/thephpleague/commonmark/compare/0.18.4...0.18.5
+[0.18.4]: https://github.com/thephpleague/commonmark/compare/0.18.3...0.18.4
+[0.18.3]: https://github.com/thephpleague/commonmark/compare/0.18.2...0.18.3
+[0.18.2]: https://github.com/thephpleague/commonmark/compare/0.18.1...0.18.2
+[0.18.1]: https://github.com/thephpleague/commonmark/compare/0.18.0...0.18.1
+[0.18.0]: https://github.com/thephpleague/commonmark/compare/0.17.5...0.18.0
+[0.17.5]: https://github.com/thephpleague/commonmark/compare/0.17.4...0.17.5
+[0.17.4]: https://github.com/thephpleague/commonmark/compare/0.17.3...0.17.4
+[0.17.3]: https://github.com/thephpleague/commonmark/compare/0.17.2...0.17.3
+[0.17.2]: https://github.com/thephpleague/commonmark/compare/0.17.1...0.17.2
+[0.17.1]: https://github.com/thephpleague/commonmark/compare/0.17.0...0.17.1
+[0.17.0]: https://github.com/thephpleague/commonmark/compare/0.16.0...0.17.0
+[0.16.0]: https://github.com/thephpleague/commonmark/compare/0.15.7...0.16.0
+[0.15.7]: https://github.com/thephpleague/commonmark/compare/0.15.6...0.15.7
+[0.15.6]: https://github.com/thephpleague/commonmark/compare/0.15.5...0.15.6
+[0.15.5]: https://github.com/thephpleague/commonmark/compare/0.15.4...0.15.5
+[0.15.4]: https://github.com/thephpleague/commonmark/compare/0.15.3...0.15.4
+[0.15.3]: https://github.com/thephpleague/commonmark/compare/0.15.2...0.15.3
+[0.15.2]: https://github.com/thephpleague/commonmark/compare/0.15.1...0.15.2
+[0.15.1]: https://github.com/thephpleague/commonmark/compare/0.15.0...0.15.1
+[0.15.0]: https://github.com/thephpleague/commonmark/compare/0.14.0...0.15.0
+[0.14.0]: https://github.com/thephpleague/commonmark/compare/0.13.4...0.14.0
+[0.13.4]: https://github.com/thephpleague/commonmark/compare/0.13.3...0.13.4
+[0.13.3]: https://github.com/thephpleague/commonmark/compare/0.13.2...0.13.3
+[0.13.2]: https://github.com/thephpleague/commonmark/compare/0.13.1...0.13.2
+[0.13.1]: https://github.com/thephpleague/commonmark/compare/0.13.0...0.13.1
+[0.13.0]: https://github.com/thephpleague/commonmark/compare/0.12.0...0.13.0
+[0.12.0]: https://github.com/thephpleague/commonmark/compare/0.11.3...0.12.0
+[0.11.3]: https://github.com/thephpleague/commonmark/compare/0.11.2...0.11.3
+[0.11.2]: https://github.com/thephpleague/commonmark/compare/0.11.1...0.11.2
+[0.11.1]: https://github.com/thephpleague/commonmark/compare/0.11.0...0.11.1
+[0.11.0]: https://github.com/thephpleague/commonmark/compare/0.10.0...0.11.0
+[0.10.0]: https://github.com/thephpleague/commonmark/compare/0.9.0...0.10.0
+[0.9.0]: https://github.com/thephpleague/commonmark/compare/0.8.0...0.9.0
+[0.8.0]: https://github.com/thephpleague/commonmark/compare/0.7.2...0.8.0
+[0.7.2]: https://github.com/thephpleague/commonmark/compare/0.7.1...0.7.2
+[0.7.1]: https://github.com/thephpleague/commonmark/compare/0.7.0...0.7.1
+[0.7.0]: https://github.com/thephpleague/commonmark/compare/0.6.1...0.7.0
+[0.6.1]: https://github.com/thephpleague/commonmark/compare/0.6.0...0.6.1
+[0.6.0]: https://github.com/thephpleague/commonmark/compare/0.5.1...0.6.0
+[0.5.1]: https://github.com/thephpleague/commonmark/compare/0.5.0...0.5.1
+[0.5.0]: https://github.com/thephpleague/commonmark/compare/0.4.0...0.5.0
+[0.4.0]: https://github.com/thephpleague/commonmark/compare/0.3.0...0.4.0
+[0.3.0]: https://github.com/thephpleague/commonmark/compare/0.2.1...0.3.0
+[0.2.1]: https://github.com/thephpleague/commonmark/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/thephpleague/commonmark/compare/0.1.2...0.2.0
+[0.1.2]: https://github.com/thephpleague/commonmark/compare/0.1.1...0.1.2
+[0.1.1]: https://github.com/thephpleague/commonmark/compare/0.1.0...0.1.1