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# API Documentation
*Please use only this documented API when working with the parser. Methods
not documented here are subject to change at any point.*
## `parser` function
This is the module's main entry point.
```js
const parser = require('postcss-selector-parser');
```
### `parser([transform], [options])`
Creates a new `processor` instance
```js
const processor = parser();
```
Or, with optional transform function
```js
const transform = selectors => {
selectors.walkUniversals(selector => {
selector.remove();
});
};
const processor = parser(transform)
// Example
const result = processor.processSync('*.class');
// => .class
```
[See processor documentation](#processor)
Arguments:
* `transform (function)`: Provide a function to work with the parsed AST.
* `options (object)`: Provide default options for all calls on the returned `Processor`.
### `parser.attribute([props])`
Creates a new attribute selector.
```js
parser.attribute({attribute: 'href'});
// => [href]
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.className([props])`
Creates a new class selector.
```js
parser.className({value: 'button'});
// => .button
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.combinator([props])`
Creates a new selector combinator.
```js
parser.combinator({value: '+'});
// => +
```
Arguments:
* `props (object)`: The new node's properties.
Notes:
* **Descendant Combinators** The value of descendant combinators created by the
parser always just a single space (`" "`). For descendant selectors with no
comments, additional space is now stored in `node.spaces.before`. Depending
on the location of comments, additional spaces may be stored in
`node.raws.spaces.before`, `node.raws.spaces.after`, or `node.raws.value`.
* **Named Combinators** Although, nonstandard and unlikely to ever become a standard,
named combinators like `/deep/` and `/for/` are parsed as combinators. The
`node.value` is name after being unescaped and normalized as lowercase. The
original value for the combinator name is stored in `node.raws.value`.
### `parser.comment([props])`
Creates a new comment.
```js
parser.comment({value: '/* Affirmative, Dave. I read you. */'});
// => /* Affirmative, Dave. I read you. */
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.id([props])`
Creates a new id selector.
```js
parser.id({value: 'search'});
// => #search
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.nesting([props])`
Creates a new nesting selector.
```js
parser.nesting();
// => &
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.pseudo([props])`
Creates a new pseudo selector.
```js
parser.pseudo({value: '::before'});
// => ::before
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.root([props])`
Creates a new root node.
```js
parser.root();
// => (empty)
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.selector([props])`
Creates a new selector node.
```js
parser.selector();
// => (empty)
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.string([props])`
Creates a new string node.
```js
parser.string();
// => (empty)
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.tag([props])`
Creates a new tag selector.
```js
parser.tag({value: 'button'});
// => button
```
Arguments:
* `props (object)`: The new node's properties.
### `parser.universal([props])`
Creates a new universal selector.
```js
parser.universal();
// => *
```
Arguments:
* `props (object)`: The new node's properties.
## Node types
### `node.type`
A string representation of the selector type. It can be one of the following;
`attribute`, `class`, `combinator`, `comment`, `id`, `nesting`, `pseudo`,
`root`, `selector`, `string`, `tag`, or `universal`. Note that for convenience,
these constants are exposed on the main `parser` as uppercased keys. So for
example you can get `id` by querying `parser.ID`.
```js
parser.attribute({attribute: 'href'}).type;
// => 'attribute'
```
### `node.parent`
Returns the parent node.
```js
root.nodes[0].parent === root;
```
### `node.toString()`, `String(node)`, or `'' + node`
Returns a string representation of the node.
```js
const id = parser.id({value: 'search'});
console.log(String(id));
// => #search
```
### `node.next()` & `node.prev()`
Returns the next/previous child of the parent node.
```js
const next = id.next();
if (next && next.type !== 'combinator') {
throw new Error('Qualified IDs are not allowed!');
}
```
### `node.replaceWith(node)`
Replace a node with another.
```js
const attr = selectors.first.first;
const className = parser.className({value: 'test'});
attr.replaceWith(className);
```
Arguments:
* `node`: The node to substitute the original with.
### `node.remove()`
Removes the node from its parent node.
```js
if (node.type === 'id') {
node.remove();
}
```
### `node.clone([opts])`
Returns a copy of a node, detached from any parent containers that the
original might have had.
```js
const cloned = node.clone();
```
### `node.isAtPosition(line, column)`
Return a `boolean` indicating whether this node includes the character at the
position of the given line and column. Returns `undefined` if the nodes lack
sufficient source metadata to determine the position.
Arguments:
* `line`: 1-index based line number relative to the start of the selector.
* `column`: 1-index based column number relative to the start of the selector.
### `node.spaces`
Extra whitespaces around the node will be moved into `node.spaces.before` and
`node.spaces.after`. So for example, these spaces will be moved as they have
no semantic meaning:
```css
h1 , h2 {}
```
For descendent selectors, the value is always a single space.
```css
h1 h2 {}
```
Additional whitespace is found in either the `node.spaces.before` and `node.spaces.after` depending on the presence of comments or other whitespace characters. If the actual whitespace does not start or end with a single space, the node's raw value is set to the actual space(s) found in the source.
### `node.source`
An object describing the node's start/end, line/column source position.
Within the following CSS, the `.bar` class node ...
```css
.foo,
.bar {}
```
... will contain the following `source` object.
```js
source: {
start: {
line: 2,
column: 3
},
end: {
line: 2,
column: 6
}
}
```
### `node.sourceIndex`
The zero-based index of the node within the original source string.
Within the following CSS, the `.baz` class node will have a `sourceIndex` of `12`.
```css
.foo, .bar, .baz {}
```
## Container types
The `root`, `selector`, and `pseudo` nodes have some helper methods for working
with their children.
### `container.nodes`
An array of the container's children.
```js
// Input: h1 h2
selectors.at(0).nodes.length // => 3
selectors.at(0).nodes[0].value // => 'h1'
selectors.at(0).nodes[1].value // => ' '
```
### `container.first` & `container.last`
The first/last child of the container.
```js
selector.first === selector.nodes[0];
selector.last === selector.nodes[selector.nodes.length - 1];
```
### `container.at(index)`
Returns the node at position `index`.
```js
selector.at(0) === selector.first;
selector.at(0) === selector.nodes[0];
```
Arguments:
* `index`: The index of the node to return.
### `container.atPosition(line, column)`
Returns the node at the source position `line` and `column`.
```js
// Input: :not(.foo),\n#foo > :matches(ol, ul)
selector.atPosition(1, 1); // => :not(.foo)
selector.atPosition(2, 1); // => \n#foo
```
Arguments:
* `line`: The line number of the node to return.
* `column`: The column number of the node to return.
### `container.index(node)`
Return the index of the node within its container.
```js
selector.index(selector.nodes[2]) // => 2
```
Arguments:
* `node`: A node within the current container.
### `container.length`
Proxy to the length of the container's nodes.
```js
container.length === container.nodes.length
```
### `container` Array iterators
The container class provides proxies to certain Array methods; these are:
* `container.map === container.nodes.map`
* `container.reduce === container.nodes.reduce`
* `container.every === container.nodes.every`
* `container.some === container.nodes.some`
* `container.filter === container.nodes.filter`
* `container.sort === container.nodes.sort`
Note that these methods only work on a container's immediate children; recursive
iteration is provided by `container.walk`.
### `container.each(callback)`
Iterate the container's immediate children, calling `callback` for each child.
You may return `false` within the callback to break the iteration.
```js
let className;
selectors.each((selector, index) => {
if (selector.type === 'class') {
className = selector.value;
return false;
}
});
```
Note that unlike `Array#forEach()`, this iterator is safe to use whilst adding
or removing nodes from the container.
Arguments:
* `callback (function)`: A function to call for each node, which receives `node`
and `index` arguments.
### `container.walk(callback)`
Like `container#each`, but will also iterate child nodes as long as they are
`container` types.
```js
selectors.walk((selector, index) => {
// all nodes
});
```
Arguments:
* `callback (function)`: A function to call for each node, which receives `node`
and `index` arguments.
This iterator is safe to use whilst mutating `container.nodes`,
like `container#each`.
### `container.walk` proxies
The container class provides proxy methods for iterating over types of nodes,
so that it is easier to write modules that target specific selectors. Those
methods are:
* `container.walkAttributes`
* `container.walkClasses`
* `container.walkCombinators`
* `container.walkComments`
* `container.walkIds`
* `container.walkNesting`
* `container.walkPseudos`
* `container.walkTags`
* `container.walkUniversals`
### `container.split(callback)`
This method allows you to split a group of nodes by returning `true` from
a callback. It returns an array of arrays, where each inner array corresponds
to the groups that you created via the callback.
```js
// (input) => h1 h2>>h3
const list = selectors.first.split(selector => {
return selector.type === 'combinator';
});
// (node values) => [['h1', ' '], ['h2', '>>'], ['h3']]
```
Arguments:
* `callback (function)`: A function to call for each node, which receives `node`
as an argument.
### `container.prepend(node)` & `container.append(node)`
Add a node to the start/end of the container. Note that doing so will set
the parent property of the node to this container.
```js
const id = parser.id({value: 'search'});
selector.append(id);
```
Arguments:
* `node`: The node to add.
### `container.insertBefore(old, new)` & `container.insertAfter(old, new)`
Add a node before or after an existing node in a container:
```js
selectors.walk(selector => {
if (selector.type !== 'class') {
const className = parser.className({value: 'theme-name'});
selector.parent.insertAfter(selector, className);
}
});
```
Arguments:
* `old`: The existing node in the container.
* `new`: The new node to add before/after the existing node.
### `container.removeChild(node)`
Remove the node from the container. Note that you can also use
`node.remove()` if you would like to remove just a single node.
```js
selector.length // => 2
selector.remove(id)
selector.length // => 1;
id.parent // undefined
```
Arguments:
* `node`: The node to remove.
### `container.removeAll()` or `container.empty()`
Remove all children from the container.
```js
selector.removeAll();
selector.length // => 0
```
## Root nodes
A root node represents a comma separated list of selectors. Indeed, all
a root's `toString()` method does is join its selector children with a ','.
Other than this, it has no special functionality and acts like a container.
### `root.trailingComma`
This will be set to `true` if the input has a trailing comma, in order to
support parsing of legacy CSS hacks.
## Selector nodes
A selector node represents a single complex selector. For example, this
selector string `h1 h2 h3, [href] > p`, is represented as two selector nodes.
It has no special functionality of its own.
## Pseudo nodes
A pseudo selector extends a container node; if it has any parameters of its
own (such as `h1:not(h2, h3)`), they will be its children. Note that the pseudo
`value` will always contain the colons preceding the pseudo identifier. This
is so that both `:before` and `::before` are properly represented in the AST.
## Attribute nodes
### `attribute.quoted`
Returns `true` if the attribute's value is wrapped in quotation marks, false if it is not.
Remains `undefined` if there is no attribute value.
```css
[href=foo] /* false */
[href='foo'] /* true */
[href="foo"] /* true */
[href] /* undefined */
```
### `attribute.qualifiedAttribute`
Returns the attribute name qualified with the namespace if one is given.
### `attribute.offsetOf(part)`
Returns the offset of the attribute part specified relative to the
start of the node of the output string. This is useful in raising
error messages about a specific part of the attribute, especially
in combination with `attribute.sourceIndex`.
Returns `-1` if the name is invalid or the value doesn't exist in this
attribute.
The legal values for `part` are:
* `"ns"` - alias for "namespace"
* `"namespace"` - the namespace if it exists.
* `"attribute"` - the attribute name
* `"attributeNS"` - the start of the attribute or its namespace
* `"operator"` - the match operator of the attribute
* `"value"` - The value (string or identifier)
* `"insensitive"` - the case insensitivity flag
### `attribute.raws.unquoted`
Returns the unquoted content of the attribute's value.
Remains `undefined` if there is no attribute value.
```css
[href=foo] /* foo */
[href='foo'] /* foo */
[href="foo"] /* foo */
[href] /* undefined */
```
### `attribute.spaces`
Like `node.spaces` with the `before` and `after` values containing the spaces
around the element, the parts of the attribute can also have spaces before
and after them. The for each of `attribute`, `operator`, `value` and
`insensitive` there is corresponding property of the same nam in
`node.spaces` that has an optional `before` or `after` string containing only
whitespace.
Note that corresponding values in `attributes.raws.spaces` contain values
including any comments. If set, these values will override the
`attribute.spaces` value. Take care to remove them if changing
`attribute.spaces`.
### `attribute.raws`
The raws object stores comments and other information necessary to re-render
the node exactly as it was in the source.
If a comment is embedded within the identifiers for the `namespace`, `attribute`
or `value` then a property is placed in the raws for that value containing the full source of the propery including comments.
If a comment is embedded within the space between parts of the attribute
then the raw for that space is set accordingly.
Setting an attribute's property `raws` value to be deleted.
For now, changing the spaces required also updating or removing any of the
raws values that override them.
Example: `[ /*before*/ href /* after-attr */ = /* after-operator */ te/*inside-value*/st/* wow */ /*omg*/i/*bbq*/ /*whodoesthis*/]` would parse as:
```js
{
attribute: "href",
operator: "=",
value: "test",
spaces: {
before: '',
after: '',
attribute: { before: ' ', after: ' ' },
operator: { after: ' ' },
value: { after: ' ' },
insensitive: { after: ' ' }
},
raws: {
spaces: {
attribute: { before: ' /*before*/ ', after: ' /* after-attr */ ' },
operator: { after: ' /* after-operator */ ' },
value: { after: '/* wow */ /*omg*/' },
insensitive: { after: '/*bbq*/ /*whodoesthis*/' }
},
unquoted: 'test',
value: 'te/*inside-value*/st'
}
}
```
## `Processor`
### `ProcessorOptions`
* `lossless` - When `true`, whitespace is preserved. Defaults to `true`.
* `updateSelector` - When `true`, if any processor methods are passed a postcss
`Rule` node instead of a string, then that Rule's selector is updated
with the results of the processing. Defaults to `true`.
### `process|processSync(selectors, [options])`
Processes the `selectors`, returning a string from the result of processing.
Note: when the `updateSelector` option is set, the rule's selector
will be updated with the resulting string.
**Example:**
```js
const parser = require("postcss-selector-parser");
const processor = parser();
let result = processor.processSync(' .class');
console.log(result);
// => .class
// Asynchronous operation
let promise = processor.process(' .class').then(result => {
console.log(result)
// => .class
});
// To have the parser normalize whitespace values, utilize the options
result = processor.processSync(' .class ', {lossless: false});
console.log(result);
// => .class
// For better syntax errors, pass a PostCSS Rule node.
const postcss = require('postcss');
rule = postcss.rule({selector: ' #foo > a, .class '});
processor.process(rule, {lossless: false, updateSelector: true}).then(result => {
console.log(result);
// => #foo>a,.class
console.log("rule:", rule.selector);
// => rule: #foo>a,.class
})
```
Arguments:
* `selectors (string|postcss.Rule)`: Either a selector string or a PostCSS Rule
node.
* `[options] (object)`: Process options
### `ast|astSync(selectors, [options])`
Like `process()` and `processSync()` but after
processing the `selectors` these methods return the `Root` node of the result
instead of a string.
Note: when the `updateSelector` option is set, the rule's selector
will be updated with the resulting string.
### `transform|transformSync(selectors, [options])`
Like `process()` and `processSync()` but after
processing the `selectors` these methods return the value returned by the
processor callback.
Note: when the `updateSelector` option is set, the rule's selector
will be updated with the resulting string.
### Error Handling Within Selector Processors
The root node passed to the selector processor callback
has a method `error(message, options)` that returns an
error object. This method should always be used to raise
errors relating to the syntax of selectors. The options
to this method are passed to postcss's error constructor
([documentation](http://postcss.org/api/#container-error)).
#### Async Error Example
```js
let processor = (root) => {
return new Promise((resolve, reject) => {
root.walkClasses((classNode) => {
if (/^(.*)[-_]/.test(classNode.value)) {
let msg = "classes may not have underscores or dashes in them";
reject(root.error(msg, {
index: classNode.sourceIndex + RegExp.$1.length + 1,
word: classNode.value
}));
}
});
resolve();
});
};
const postcss = require("postcss");
const parser = require("postcss-selector-parser");
const selectorProcessor = parser(processor);
const plugin = postcss.plugin('classValidator', (options) => {
return (root) => {
let promises = [];
root.walkRules(rule => {
promises.push(selectorProcessor.process(rule));
});
return Promise.all(promises);
};
});
postcss(plugin()).process(`
.foo-bar {
color: red;
}
`.trim(), {from: 'test.css'}).catch((e) => console.error(e.toString()));
// CssSyntaxError: classValidator: ./test.css:1:5: classes may not have underscores or dashes in them
//
// > 1 | .foo-bar {
// | ^
// 2 | color: red;
// 3 | }
```
#### Synchronous Error Example
```js
let processor = (root) => {
root.walkClasses((classNode) => {
if (/.*[-_]/.test(classNode.value)) {
let msg = "classes may not have underscores or dashes in them";
throw root.error(msg, {
index: classNode.sourceIndex,
word: classNode.value
});
}
});
};
const postcss = require("postcss");
const parser = require("postcss-selector-parser");
const selectorProcessor = parser(processor);
const plugin = postcss.plugin('classValidator', (options) => {
return (root) => {
root.walkRules(rule => {
selectorProcessor.processSync(rule);
});
};
});
postcss(plugin()).process(`
.foo-bar {
color: red;
}
`.trim(), {from: 'test.css'}).catch((e) => console.error(e.toString()));
// CssSyntaxError: classValidator: ./test.css:1:5: classes may not have underscores or dashes in them
//
// > 1 | .foo-bar {
// | ^
// 2 | color: red;
// 3 | }
```

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# 6.1.2
- Fixed: erroneous trailing combinators in pseudos
# 6.1.1
- Fixed: improve typings of constructor helpers (#292)
# 6.1.0
- Feature: add `sourceIndex` to `Selector` nodes (#290)
# 6.0.16
- Fixed: add missing `index` argument to `each`/`walk` callback types (#289)
# 6.0.15
- Fixed: Node#prev and Node#next type for the first/last node
# 6.0.14
- Fixed: type definitions
# 6.0.13
- Fixed: throw on unexpected pipe symbols
# 6.0.12
- Fixed: `clone` arguments should be optional
# 6.0.11
- Fixed: parse attribute case insensitivity flag
# 6.0.10
- Fixed: `isPseudoElement()` supports `:first-letter` and `:first-line`
# 6.0.9
- Fixed: `Combinator.raws` property type
# 6.0.8
- Fixed: reduced size
# 6.0.7
- Fixed: parse animation percents
# 6.0.6
- Fixed: parse quoted attributes containing a newline correctly
# 6.0.5
- Perf: rework unesc for a 63+% performance boost
# 6.0.4
- Fixed: ts errors
# 6.0.3
- Fixed: replace node built-in "util" module with "util-deprecate"
- Fixed: handle uppercase pseudo elements
- Fixed: do not create invalid combinator before comment
# 6.0.2
- Fixed an issue with parsing and stringifying an empty attribute value
# 6.0.1
- Fixed an issue with unicode surrogate pair parsing
# 6.0.0
- Updated: `cssesc` to 3.0.0 (major)
- Fixed: Issues with escaped `id` and `class` selectors
# 5.0.0
- Allow escaped dot within class name.
- Update PostCSS to 7.0.7 (patch)
# 5.0.0-rc.4
- Fixed an issue where comments immediately after an insensitive (in attribute)
were not parsed correctly.
- Updated `cssesc` to 2.0.0 (major).
- Removed outdated integration tests.
- Added tests for custom selectors, tags with attributes, the universal
selector with pseudos, and tokens after combinators.
# 5.0.0-rc.1
To ease adoption of the v5.0 release, we have relaxed the node version
check performed by npm at installation time to allow for node 4, which
remains officially unsupported, but likely to continue working for the
time being.
# 5.0.0-rc.0
This release has **BREAKING CHANGES** that were required to fix regressions
in 4.0.0 and to make the Combinator Node API consistent for all combinator
types. Please read carefully.
## Summary of Changes
* The way a descendent combinator that isn't a single space character (E.g. `.a .b`) is stored in the AST has changed.
* Named Combinators (E.g. `.a /for/ .b`) are now properly parsed as a combinator.
* It is now possible to look up a node based on the source location of a character in that node and to query nodes if they contain some character.
* Several bug fixes that caused the parser to hang and run out of memory when a `/` was encountered have been fixed.
* The minimum supported version of Node is now `v6.0.0`.
### Changes to the Descendent Combinator
In prior releases, the value of a descendant combinator with multiple spaces included all the spaces.
* `.a .b`: Extra spaces are now stored as space before.
- Old & Busted:
- `combinator.value === " "`
- New hotness:
- `combinator.value === " " && combinator.spaces.before === " "`
* `.a /*comment*/.b`: A comment at the end of the combinator causes extra space to become after space.
- Old & Busted:
- `combinator.value === " "`
- `combinator.raws.value === " /*comment/"`
- New hotness:
- `combinator.value === " "`
- `combinator.spaces.after === " "`
- `combinator.raws.spaces.after === " /*comment*/"`
* `.a<newline>.b`: whitespace that doesn't start or end with a single space character is stored as a raw value.
- Old & Busted:
- `combinator.value === "\n"`
- `combinator.raws.value === undefined`
- New hotness:
- `combinator.value === " "`
- `combinator.raws.value === "\n"`
### Support for "Named Combinators"
Although, nonstandard and unlikely to ever become a standard, combinators like `/deep/` and `/for/` are now properly supported.
Because they've been taken off the standardization track, there is no spec-official name for combinators of the form `/<ident>/`. However, I talked to [Tab Atkins](https://twitter.com/tabatkins) and we agreed to call them "named combinators" so now they are called that.
Before this release such named combinators were parsed without intention and generated three nodes of type `"tag"` where the first and last nodes had a value of `"/"`.
* `.a /for/ .b` is parsed as a combinator.
- Old & Busted:
- `root.nodes[0].nodes[1].type === "tag"`
- `root.nodes[0].nodes[1].value === "/"`
- New hotness:
- `root.nodes[0].nodes[1].type === "combinator"`
- `root.nodes[0].nodes[1].value === "/for/"`
* `.a /F\6fR/ .b` escapes are handled and uppercase is normalized.
- Old & Busted:
- `root.nodes[0].nodes[2].type === "tag"`
- `root.nodes[0].nodes[2].value === "F\\6fR"`
- New hotness:
- `root.nodes[0].nodes[1].type === "combinator"`
- `root.nodes[0].nodes[1].value === "/for/"`
- `root.nodes[0].nodes[1].raws.value === "/F\\6fR/"`
### Source position checks and lookups
A new API was added to look up a node based on the source location.
```js
const selectorParser = require("postcss-selector-parser");
// You can find the most specific node for any given character
let combinator = selectorParser.astSync(".a > .b").atPosition(1,4);
combinator.toString() === " > ";
// You can check if a node includes a specific character
// Whitespace surrounding the node that is owned by that node
// is included in the check.
[2,3,4,5,6].map(column => combinator.isAtPosition(1, column));
// => [false, true, true, true, false]
```
# 4.0.0
This release has **BREAKING CHANGES** that were required to fix bugs regarding values with escape sequences. Please read carefully.
* **Identifiers with escapes** - CSS escape sequences are now hidden from the public API by default.
The normal value of a node like a class name or ID, or an aspect of a node such as attribute
selector's value, is unescaped. Escapes representing Non-ascii characters are unescaped into
unicode characters. For example: `bu\tton, .\31 00, #i\2764\FE0Fu, [attr="value is \"quoted\""]`
will parse respectively to the values `button`, `100`, `i❤️u`, `value is "quoted"`.
The original escape sequences for these values can be found in the corresponding property name
in `node.raws`. Where possible, deprecation warnings were added, but the nature
of escape handling makes it impossible to detect what is escaped or not. Our expectation is
that most users are neither expecting nor handling escape sequences in their use of this library,
and so for them, this is a bug fix. Users who are taking care to handle escapes correctly can
now update their code to remove the escape handling and let us do it for them.
* **Mutating values with escapes** - When you make an update to a node property that has escape handling
The value is assumed to be unescaped, and any special characters are escaped automatically and
the corresponding `raws` value is immediately updated. This can result in changes to the original
escape format. Where the exact value of the escape sequence is important there are methods that
allow both values to be set in conjunction. There are a number of new convenience methods for
manipulating values that involve escapes, especially for attributes values where the quote mark
is involved. See https://github.com/postcss/postcss-selector-parser/pull/133 for an extensive
write-up on these changes.
**Upgrade/API Example**
In `3.x` there was no unescape handling and internal consistency of several properties was the caller's job to maintain. It was very easy for the developer
to create a CSS file that did not parse correctly when some types of values
were in use.
```js
const selectorParser = require("postcss-selector-parser");
let attr = selectorParser.attribute({attribute: "id", operator: "=", value: "a-value"});
attr.value; // => "a-value"
attr.toString(); // => [id=a-value]
// Add quotes to an attribute's value.
// All these values have to be set by the caller to be consistent:
// no internal consistency is maintained.
attr.raws.unquoted = attr.value
attr.value = "'" + attr.value + "'";
attr.value; // => "'a-value'"
attr.quoted = true;
attr.toString(); // => "[id='a-value']"
```
In `4.0` there is a convenient API for setting and mutating values
that may need escaping. Especially for attributes.
```js
const selectorParser = require("postcss-selector-parser");
// The constructor requires you specify the exact escape sequence
let className = selectorParser.className({value: "illegal class name", raws: {value: "illegal\\ class\\ name"}});
className.toString(); // => '.illegal\\ class\\ name'
// So it's better to set the value as a property
className = selectorParser.className();
// Most properties that deal with identifiers work like this
className.value = "escape for me";
className.value; // => 'escape for me'
className.toString(); // => '.escape\\ for\\ me'
// emoji and all non-ascii are escaped to ensure it works in every css file.
className.value = "😱🦄😍";
className.value; // => '😱🦄😍'
className.toString(); // => '.\\1F631\\1F984\\1F60D'
// you can control the escape sequence if you want, or do bad bad things
className.setPropertyAndEscape('value', 'xxxx', 'yyyy');
className.value; // => "xxxx"
className.toString(); // => ".yyyy"
// Pass a value directly through to the css output without escaping it.
className.setPropertyWithoutEscape('value', '$REPLACE_ME$');
className.value; // => "$REPLACE_ME$"
className.toString(); // => ".$REPLACE_ME$"
// The biggest changes are to the Attribute class
// passing quoteMark explicitly is required to avoid a deprecation warning.
let attr = selectorParser.attribute({attribute: "id", operator: "=", value: "a-value", quoteMark: null});
attr.toString(); // => "[id=a-value]"
// Get the value with quotes on it and any necessary escapes.
// This is the same as reading attr.value in 3.x.
attr.getQuotedValue(); // => "a-value";
attr.quoteMark; // => null
// Add quotes to an attribute's value.
attr.quoteMark = "'"; // This is all that's required.
attr.toString(); // => "[id='a-value']"
attr.quoted; // => true
// The value is still the same, only the quotes have changed.
attr.value; // => a-value
attr.getQuotedValue(); // => "'a-value'";
// deprecated assignment, no warning because there's no escapes
attr.value = "new-value";
// no quote mark is needed so it is removed
attr.getQuotedValue(); // => "new-value";
// deprecated assignment,
attr.value = "\"a 'single quoted' value\"";
// > (node:27859) DeprecationWarning: Assigning an attribute a value containing characters that might need to be escaped is deprecated. Call attribute.setValue() instead.
attr.getQuotedValue(); // => '"a \'single quoted\' value"';
// quote mark inferred from first and last characters.
attr.quoteMark; // => '"'
// setValue takes options to make manipulating the value simple.
attr.setValue('foo', {smart: true});
// foo doesn't require any escapes or quotes.
attr.toString(); // => '[id=foo]'
attr.quoteMark; // => null
// An explicit quote mark can be specified
attr.setValue('foo', {quoteMark: '"'});
attr.toString(); // => '[id="foo"]'
// preserves quote mark by default
attr.setValue('bar');
attr.toString(); // => '[id="bar"]'
attr.quoteMark = null;
attr.toString(); // => '[id=bar]'
// with no arguments, it preserves quote mark even when it's not a great idea
attr.setValue('a value \n that should be quoted');
attr.toString(); // => '[id=a\\ value\\ \\A\\ that\\ should\\ be\\ quoted]'
// smart preservation with a specified default
attr.setValue('a value \n that should be quoted', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
// => "[id='a value \\A that should be quoted']"
attr.quoteMark = '"';
// => '[id="a value \\A that should be quoted"]'
// this keeps double quotes because it wants to quote the value and the existing value has double quotes.
attr.setValue('this should be quoted', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
// => '[id="this should be quoted"]'
// picks single quotes because the value has double quotes
attr.setValue('a "double quoted" value', {smart: true, preferCurrentQuoteMark: true, quoteMark: "'"});
// => "[id='a "double quoted" value']"
// setPropertyAndEscape lets you do anything you want. Even things that are a bad idea and illegal.
attr.setPropertyAndEscape('value', 'xxxx', 'the password is 42');
attr.value; // => "xxxx"
attr.toString(); // => "[id=the password is 42]"
// Pass a value directly through to the css output without escaping it.
attr.setPropertyWithoutEscape('value', '$REPLACEMENT$');
attr.value; // => "$REPLACEMENT$"
attr.toString(); // => "[id=$REPLACEMENT$]"
```
# 3.1.2
* Fix: Removed dot-prop dependency since it's no longer written in es5.
# 3.1.1
* Fix: typescript definitions weren't in the published package.
# 3.1.0
* Fixed numerous bugs in attribute nodes relating to the handling of comments
and whitespace. There's significant changes to `attrNode.spaces` and `attrNode.raws` since the `3.0.0` release.
* Added `Attribute#offsetOf(part)` to get the offset location of
attribute parts like `"operator"` and `"value"`. This is most
often added to `Attribute#sourceIndex` for error reporting.
# 3.0.0
## Breaking changes
* Some tweaks to the tokenizer/attribute selector parsing mean that whitespace
locations might be slightly different to the 2.x code.
* Better attribute selector parsing with more validation; postcss-selector-parser
no longer uses regular expressions to parse attribute selectors.
* Added an async API (thanks to @jacobp100); the default `process` API is now
async, and the sync API is now accessed through `processSync` instead.
* `process()` and `processSync()` now return a string instead of the Processor
instance.
* Tweaks handling of Less interpolation (thanks to @jwilsson).
* Removes support for Node 0.12.
## Other changes
* `ast()` and `astSync()` methods have been added to the `Processor`. These
return the `Root` node of the selectors after processing them.
* `transform()` and `transformSync()` methods have been added to the
`Processor`. These return the value returned by the processor callback
after processing the selectors.
* Set the parent when inserting a node (thanks to @chriseppstein).
* Correctly adjust indices when using insertBefore/insertAfter (thanks to @tivac).
* Fixes handling of namespaces with qualified tag selectors.
* `process`, `ast` and `transform` (and their sync variants) now accept a
`postcss` rule node. When provided, better errors are generated and selector
processing is automatically set back to the rule selector (unless the `updateSelector` option is set to `false`.)
* Now more memory efficient when tokenizing selectors.
### Upgrade hints
The pattern of:
`rule.selector = processor.process(rule.selector).result.toString();`
is now:
`processor.processSync(rule)`
# 2.2.3
* Resolves an issue where the parser would not reduce multiple spaces between an
ampersand and another simple selector in lossy mode (thanks to @adam-26).
# 2.2.2
* No longer hangs on an unescaped semicolon; instead the parser will throw
an exception for these cases.
# 2.2.1
* Allows a consumer to specify whitespace tokens when creating a new Node
(thanks to @Semigradsky).
# 2.2.0
* Added a new option to normalize whitespace when parsing the selector string
(thanks to @adam-26).
# 2.1.1
* Better unquoted value handling within attribute selectors
(thanks to @evilebottnawi).
# 2.1.0
* Added: Use string constants for all node types & expose them on the main
parser instance (thanks to @Aweary).
# 2.0.0
This release contains the following breaking changes:
* Renamed all `eachInside` iterators to `walk`. For example, `eachTag` is now
`walkTags`, and `eachInside` is now `walk`.
* Renamed `Node#removeSelf()` to `Node#remove()`.
* Renamed `Container#remove()` to `Container#removeChild()`.
* Renamed `Node#raw` to `Node#raws` (thanks to @davidtheclark).
* Now parses `&` as the *nesting* selector, rather than a *tag* selector.
* Fixes misinterpretation of Sass interpolation (e.g. `#{foo}`) as an
id selector (thanks to @davidtheclark).
and;
* Fixes parsing of attribute selectors with equals signs in them
(e.g. `[data-attr="foo=bar"]`) (thanks to @montmanu).
* Adds `quoted` and `raw.unquoted` properties to attribute nodes
(thanks to @davidtheclark).
# 1.3.3
* Fixes an infinite loop on `)` and `]` tokens when they had no opening pairs.
Now postcss-selector-parser will throw when it encounters these lone tokens.
# 1.3.2
* Now uses plain integers rather than `str.charCodeAt(0)` for compiled builds.
# 1.3.1
* Update flatten to v1.x (thanks to @shinnn).
# 1.3.0
* Adds a new node type, `String`, to fix a crash on selectors such as
`foo:bar("test")`.
# 1.2.1
* Fixes a crash when the parser encountered a trailing combinator.
# 1.2.0
* A more descriptive error is thrown when the parser expects to find a
pseudo-class/pseudo-element (thanks to @ashelley).
* Adds support for line/column locations for selector nodes, as well as a
`Node#sourceIndex` method (thanks to @davidtheclark).
# 1.1.4
* Fixes a crash when a selector started with a `>` combinator. The module will
now no longer throw if a selector has a leading/trailing combinator node.
# 1.1.3
* Fixes a crash on `@` tokens.
# 1.1.2
* Fixes an infinite loop caused by using parentheses in a non-pseudo element
context.
# 1.1.1
* Fixes a crash when a backslash ended a selector string.
# 1.1.0
* Adds support for replacing multiple nodes at once with `replaceWith`
(thanks to @jonathantneal).
* Parser no longer throws on sequential IDs and trailing commas, to support
parsing of selector hacks.
# 1.0.1
* Fixes using `insertAfter` and `insertBefore` during iteration.
# 1.0.0
* Adds `clone` and `replaceWith` methods to nodes.
* Adds `insertBefore` and `insertAfter` to containers.
* Stabilises API.
# 0.0.5
* Fixes crash on extra whitespace inside a pseudo selector's parentheses.
* Adds sort function to the container class.
* Enables the parser to pass its input through without transforming.
* Iteration-safe `each` and `eachInside`.
# 0.0.4
* Tidy up redundant duplication.
* Fixes a bug where the parser would loop infinitely on universal selectors
inside pseudo selectors.
* Adds `length` getter and `eachInside`, `map`, `reduce` to the container class.
* When a selector has been removed from the tree, the root node will no longer
cast it to a string.
* Adds node type iterators to the container class (e.g. `eachComment`).
* Adds filter function to the container class.
* Adds split function to the container class.
* Create new node types by doing `parser.id(opts)` etc.
* Adds support for pseudo classes anywhere in the selector.
# 0.0.3
* Adds `next` and `prev` to the node class.
* Adds `first` and `last` getters to the container class.
* Adds `every` and `some` iterators to the container class.
* Add `empty` alias for `removeAll`.
* Combinators are now types of node.
* Fixes the at method so that it is not an alias for `index`.
* Tidy up creation of new nodes in the parser.
* Refactors how namespaces are handled for consistency & less redundant code.
* Refactors AST to use `nodes` exclusively, and eliminates excessive nesting.
* Fixes nested pseudo parsing.
* Fixes whitespace parsing.
# 0.0.2
* Adds support for namespace selectors.
* Adds support for selectors joined by escaped spaces - such as `.\31\ 0`.
# 0.0.1
* Initial release.