selector

selector is a CSS selector parsing/generation/construction library.

Installation

npm install @hgargg-0710/selector

Documentation

The following is the precise description of the library's exports (v0.1).

parse (function)
generate (function)
parser (submodule)
generator (submodule)
tokens (submodule)
tree (submodule)

NOTE: it is built on top of the parsers.js library for parser-making, so some of the terminology comes from there.

`parse`

This is one of the two primary functions of the library. Given a string with a syntactically correct CSS selector, it returns an Abstract Syntax Tree constructed using the library's AST API.

function parse(selector: string): Combinator | CompoundSelector | SelectorList

The result of parse can later be passed to generate to reverse the parsing operation.

`generate`

An inverse of parse. Provided an AST constructed with the usage of library's API, returns a string.

function generate(selector: Combinator | CompoundSelector | SelectorList): string

Funny note: the combination generate(parse(selector)) can be used as a kind of generally-inneficient-but-easy-to-make-with-the-library selector-formatter...

`parser`

This is a submodule, including all the exports of the parsing-dedicated modules. In particular, the mult-layered parse function is composed of the contents of the module. It also provides the parse function as the export (aliased as SelectorParser).

The layers of parsing of a selector employed by the library are (in order of their application):

char (tokenization)
escaped (escaped sequences)
string (string character sequences)
bracket (identifying of sub-selectors)
list (identifying of selector-lists)
simple (finalization of simple selectors)
1. attribute (parsing of attribute selectors)
2. identifier (parsing of identifiers - key elements of all simple selectors)
compound (uniting simple selectors into compound ones)
despace (elimination of undesired space tokens to simplify further descendant combinator identification)
combinator (identifies combinators, and orders the compound results based on them)

The parser module exports are broken down into these submodules, which are the immidiate exports.

What follows is the enumeration of different submodules' exports and their meanings/uses within the parser.

`char`

export	description
`SelectorTokenizer`	The tokenization function (a `PatternTokenizer`). Accepts a `Pattern<string, RegExp, RegExp>` (example: `StringPattern`). Returns a `PatternCollection`
`charMap`	The `IndexMap`, on which the `SelectorTokenizer` is based. Keys are regular expressions, values - `TokenType`s corresponding to them

`escaped`

export	description
`EscapeParser`	The main parsing function. Accepts `Stream`, returns an array. Converts `Escape` followed by something else into appropriate `Escaped`
`isHex`	Checks whether the given string tests positive against `/[0-9a-fA-F]/`
`readHex`	Reads a hexidecimal from the given stream (up to 6 characters), altering the `Stream` passed
`readEscaped`	Reads a single character from a given `Stream`, altering it
`HandleEscaped`	Main handler for the `Escape` token within the `escapeMap` `IndexMap`
`escapedMap`	The `TypeMap`, on which the `EscapeParser` is based

`string`

export	description
`SelectorStringParser`	The main parsing function. Accepts `Stream`, returns an array. Converts token sequences between pairs of `"` or `'` to `SelectorString` tokens. Happens after `Escaped`
`StringCharacterParser`	Converts a given `Stream`, which is a result of limiting another `Stream` to an array, in which `SelectorSymbols` were grouped into `StringCharacters`
`quoteRead`	An object containing cached functions for reading a string starting with `'` and `"` respectively
`readUntilEscaped`	Reads from a given `Stream`, altering it, until an `Escaped` is met
`stringMap`	A `TypeMap`, on which the `SelectorStringParser` is based
`stringCharMap`	A `TypeMap`, on which the `SelectorCharacterParser` is based

`bracket`

export	description
`EndParser`	The "latter" part of the `parse` function. It unites `BracketParser`, `list`, `simple`, `compound`, `despace` and `combinator`. It also deals with recursive brackets
`SelectorListParser`	Accepts `Stream`, puts the input through `BracketParser` and `SelectorCommaParser` (from `list`).
`BracketParser`	Recursively applies `EndParser` on all encountered sub-selectors within the passed `Stream`.
`recursiveBracketParser`	The recursive component of the `EndParser`
`flatBracketParser`	The finite ("flat", non-recursive) component of the `EndParser`
`SubSelectorHandler`	The handler of sub-selectors within the `subSelectorMap`
`nestedBrack`	Returns the `nested` limitation of the given `Stream` to cover the entirety of the current sub-selector
`subSelectorMap`	The `TypeMap`, on which the `BracketMap` is based

`list`

export	description
`SelectorCommaParser`	Breaks all the pieces of parsed `Stream` into arrays and eliminates all `Comma`s

`simple`

export	description
`SimpleSelectorParser`	The main simple selectors' parser. Takes a `Stream`, returns an array of transformed tokens
`HandleElement`	Handles an element selector
`HandleId`	Handles an id selector
`HandleClass`	Handles a class selector
`HandleAttribute`	Handles an attribute selector
`HandlePseudoClass`	Handles a pseudo-class selector
`HandlePseudoElement`	Handles a pseudo-element selector
`HandleUniversal`	Handles a universal selector
`HandleParent`	Handles a parent selector
`readSimple`	Reads an identifier, optionally skipping an element of the passed `Stream`. Sub-routine used for defining some of the handlers
`simpleMap`	The `TypeMap`, on which the `SimpleSelectorParser` is based.

`attribute`

export	description
`AttributeParser`	The `BasicParser` for parsing attribute selectors.
`AttributeHandler`	Handler for attribute selectors.
`attributeMap`	The `TypeMap`, on which `AttributeParser` is based

`identifier`

export	description
`IdentifierParser`	Takes in an array of tokens, returns a `SelectorIdentifier`. Parser for `Identifiers`
`readSymbol`	Reads from a `Stream` for as long as its current symbol is a `SelectorSymbol`
`limitPartial`	Limits a given `Stream`, and moves it, to the point where the next identifier ends. Returns the limited portion.
`parseIdentifier`	Parses the identifier (a global sub-routine utilizing the `IdentifierParser` and `limitPartial`)
`identifierMap`	A `TypeMap`, on which the `IdentifierParser` is based.

`compound`

export	description
`CompoundSelectorParser`	Main parsing function. Combines different simple selectors into `CompoundSelector`s
`CompoundHandler`	The handler for simple selectors
`compoundMap`	The `TypeMap`, on which `CompoundSelectorParser` is based

`despace`

export	description
`DeSpacer`	Replaces sequences of `Space` tokens with a single one.
`DeSpace`	The handler of `Space`
`despaceMap`	The `TypeMap`, off which `DeSpacer` is based
`skipSpaces`	Skips spaces within the given `Stream`

`combinator`

export	description
`SelectorCombinatorParser`	Structures compound selectors together using combinators. The main parser function of the module
`HandleCombinator`	Combinator handler.
`HandleCompound`	Compound handler.
`combinatorMap`	`TypeMap`, off which the `SelectorCombinatorParser` is based

`generator`

This module provides functions for generation of selectors, relating to different package's AST-belonging tokens. In particular, it includes the generate function as an export (aliased as SelectorGenerator).

The abstractions work primarily with Streams , including those based off trees provided by the tree submodule.

export	description
`SelectorGenerator`	The `generate` function
`GenerateCombinator`	Generates the Combinator selector
`GeneratePseudoClass`	Generates the pseudo-class selector
`GenerateAttribute`	Generates the attribute selector
`GenerateCompound`	Generates the compound selector
`GenerateElement`	Generates the element selector
`GenerateId`	Generates the id selector
`GenerateClass`	Generates the class selector
`GeneratePseudoElement`	Generates the pseudo-element selector
`GenerateCharacters`	Generates the characters (those are `StringCharacters` and `IdentifierCharacters`)
`GenerateEscaped`	Generates the `Escaped`
`GenerateChildCombinator`	Generates the child combinator (`>`)
`GenerateDescendantCombinator`	Generates the descendant combinator ( )
`GenerateNextSiblingCombinator`	Generates the next sibling combinator (`+`)
`GenerateNamespaceCombinator`	Generates the namespace combinator (`\|`)
`GenerateSubseqSibilngCombinator`	Generates the subsequent sibling combinator (`~`)
`GenerateEndsWithMatch`	Generates the ends-with match `$=`
`GenerateIncludesMatch`	Generates the includes match `~=`
`GenerateHyphBeginMatch`	Generates the hyphen-begin match `\|=`
`GeneratePrefixMatch`	Generates the prefix match `^=`
`GenerateFindMatch`	Generates the find match `*=`
`GenerateEqualityMatch`	Generates the equality match `=`
`GenerateUniversalSelector`	Generates the universal selector `*`
`GenerateParentSelector`	Generates the parent selector `&`
`GenerateString`	Generates a string (note: preserves the quotes used - either `'`, or `"`)
`GenerateSubSelector`	Generates a sub-selector
`GenerateSelectorList`	Generates a selector-list
`GenerateIdentifier`	Generates an identifier
`SelectorSourceGenerator`	The `SourceGenerator`, on which the `generate` function is based off
`generatorMap`	The `TypeMap`, on which the `SelectorSourceGenerator` is based off

`tree`

Provides exports related to TreeStream-building based off the parser-created AST.

export	description
`SelectorStream`	A function accepting the library's AST (result of `parse`, for instance), and transforming it into a `Stream`
`SelectorTree`	The default export of the submodule. Converts the given library's AST into a tree that can be put through `TreeStream` to make a `Stream` (on it, teh `SelectorStream` is based)
`SimpleTree`	Like others below, a function for transforming a node of an AST into a `TreeStream` argument. Converts the `.value` to the tree, and makes `[.value]` the children array
`ChildlessTree`	The tree without children
`ValueTree`	The tree in which `.value` is the `.children`
`AttributeTree`	The function that transforms an `SelectorAttribute` into a tree
`PseudoClassTree`	The function that transforms a `PseudoClassSelector` into a tree
`CombinatorTree`	The function that transforms a `CombinatorToken` into a tree
`treeMap`	The `IndexMap`, on which the `SelectorTree` is based

`tokens`

The tokens submodule includes various TokenTypes, used by the library to represent various classes of tokens.

Like, parser, tokens submodule is, too, broken down onto submodules itself:

char (tokenization)
escaped (escaped sequences)
string (string character sequences)
bracket (identifying of sub-selectors)
list (identifying of selector-lists)
simple (finalization of simple selectors)
1. attribute (parsing of attribute selectors)
2. identifier (parsing of identifiers - key elements of all simple selectors)
compound (uniting simple selectors into compound ones)
combinator (identifies combinators, and orders the compound results based on them)

The following is the enumeration of TokenTypes exported by the corresponding submodules.

`char`

`TokenType`	represents	`type`-word
`SelectorHash`	The hash (`#`) symbol	`"hash"`
`SelectorDot`	The dot (`.`) symbol	`"dot"`
`Space`	One of the space (`/\s/`) symbols	`"space"`
`RectOp`	The opening square bracket (`[`) symbol	`"rop"`
`RectCl`	The closing square bracket (`]`) symbol	`"rcl"`
`DoubleColon`	The double colon symbol sequence (`::`)	`"double-colon"`
`Colon`	The single colon (`:`) symbol	`"colon"`
`Plus`	The plus (`+`) symbol	`"plus"`
`Child`	The child combinator symbol (`>`)	`"child"`
`OpBrack`	The opening bracket (`(`) symbol	`"opbrack"`
`ClBrack`	The closing bracket (`)`) symbol	`"clbrack"`
`EndsWithMatch`	The ends-with match (`$=`) symbol-sequence	`"endswith"`
`IncludesMatch`	The includes-match (`~=`) symbol-sequence	`"includes"`
`HyphenBeginMatch`	The hyphen-beign match (`\|=`) symbol-sequence	`"hyphbeg"`
`PrefixMatch`	The prefix-match (`^=`) symbol-sequence	`"prefix"`
`FindMatch`	The find-match (`*=`) symbol-sequence	`"find"`
`EqMatch`	The equality-match (`*=`) symbol	`"eq"`
`Any`	The universal selector (`*`) symbol	`"any"`
`Namespace`	The namespace combinator symbol (`\|`)	`"namespace"`
`Sibling`	The sibling combinator symbol (`~`)	`"sibling"`
`Quote`	One of the quote symbols (`'` or `"`)	`"quote"`
`Comma`	The comma (`,`) symbol	`"comma"`
`Ampersand`	The ampersand (`&`) symbol	`"ampersand"`
`Escape`	The escape (`\`) symbol	`"escape"`
`SelectorSymbol`	Any other symbol (not in the table already)	`"symbol"`

These TokenTypes are used for initial tokenization of the given CSS selector.

`escaped`

const Escaped: TokenType

Represents an escaped character or a hex number up to 6 digits. Used inside identifiers and strings.

Type-word: "escaped"

const SelectorPartial: (x: any): boolean

Checks for whether a given item is one of SelectorSymbols or Escapeds.

`string`

`TokenType`	represents	`type`-word
`SelectorString`	A string	`"string"`
`StringCharacters`	A sequence of in-string characters	`"string-chars"`

`bracket`

`TokenType`	represents	`type`-word
`SubSelector`	A sub-selector	`"sub-selector"`

`list`

`TokenType`	represents	`type`-word
`SelectorList`	A selector-list (`..., ..., ...`)	`"selector-list"`

`simple`

`TokenType`	represents	`type`-word
`SelectorElement`	An element-selector (ex: `h1`)	`"selector-list"`
`SelectorId`	An id-selector (ex: `#i-am-unique`)	`"id"`
`SelectorClass`	A class-selector (ex: `.we-are-many`)	`"class"`
`SelectorAttribute`	An attribute-selector (ex: `[nom="valeur"]`)	`"attribute"`
`PseudoClassSelector`	A pseudo-class selector (ex: `:hover`)	`"pseudo-class"`
`PseudoElementSelector`	A pseudo-element selector (ex: `::after`)	`"pseudo-element"`
`UniversalSelector`	A universal selector (`"*"`)	`"universal"`
`ParentSelector`	Parent-selector (`&`)	`"parent"`

`attribute`

The only export is the isMatch predicate.

const isMatch: (x: any): boolean

Returns true only for one of EndsWithMatch, IncludesMatch, HyphenBegMatch, PrefixMatch, FindMatch, EqMatch.

`identifier`

`TokenType`	represents	`type`-word
`SelectorIdentifier`	An identifier	`"identifier"`
`IdentifierCharacters`	A sequence of in-identifier characters	`"id-chars"`

`compound`

`TokenType`	represents	`type`-word
`CompoundSelector`	A compound selector, includes simple selectors	`"compound"`

Also, contains the isSelector predicate

const isSelector: (x: any): boolean

Returns true only if the argument is one of SelectorElement, SelectorId, SelectorClass, SelectorAttribute, PseudoClassSelector, PseudoElementSelector, UniversalSelector, ParentSelector

`combinator`

`TokenType`	represents	`type`-word
`CombinatorToken`	A combinator, consists of a combinator token and arguments	`"compound"`

Also, exports the isCombinator predicate.

const isCombinator: (x: any): boolean

Returns true only to one of the Child, Space, Plus, Namespace, Sibling.

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