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import { Enum, constructors, match } from './utils/adt'
import * as P from './utils/parser-comb'
export type CSSUnit = '' | 's' | 'ms'
export interface Selector {
tag: string | undefined
id: string
selectors: Array<SelectorComp>
}
export type SelectorComp = Enum<{
ClassName: string
Attr: readonly [string, string]
}>
export const SelectorComp = constructors<SelectorComp>()
export type Expr = Enum<{
Call: { name: string; args: Expr[] }
Identifier: string
VarIdentifier: string
LiteralString: string
LiteralNumber: { value: number; unit: CSSUnit }
Pair: { key: string; value: Expr }
Selector: Selector
}>
export const Expr = constructors<Expr>()
const whitespace = P.regex(/^\s*/)
const consumeWhitespace = <A>(p: P.Parser<A>): P.Parser<A> =>
P.between(whitespace, p, whitespace)
const comma = consumeWhitespace(P.string(','))
const parens = <A>(p: P.Parser<A>): P.Parser<A> =>
P.between(P.string('('), p, P.string(')'))
const identifierParser = P.regex(/^[a-z][a-z0-9_-]*/i)
const varIdentifierParser = P.regex(/^--[a-z][a-z0-9-]*/i)
const singleQuote = P.string("'")
const doubleQuote = P.string('"')
const identifierExprParser = P.map(identifierParser, Expr.Identifier)
const varIdentifierExprParser = P.map(varIdentifierParser, Expr.VarIdentifier)
const callExprParser = (input: string) =>
P.map(
P.zip2(
consumeWhitespace(identifierParser),
parens(consumeWhitespace(P.sepBy(exprParser, comma))),
),
([name, args]) => Expr.Call({ name, args }),
)(input)
const stringLiteralParser = P.or([
P.between(singleQuote, P.regex(/^[^']*/), singleQuote),
P.between(doubleQuote, P.regex(/^[^"]*/), doubleQuote),
])
const stringLiteralExprParser: P.Parser<Expr> = P.map(
stringLiteralParser,
Expr.LiteralString,
)
const numberParser = P.regex(/^[-+]?((\d*\.\d+)|\d+)/)
const numberExprParser: P.Parser<Expr> = P.map(
P.zip2(numberParser, P.optional(P.regex(/^(s|ms)/i))),
([value, unit]) =>
Expr.LiteralNumber({ value: Number(value), unit: (unit ?? '') as CSSUnit }),
)
const tagP = identifierParser
const idP = P.prefixed(P.string('#'), identifierParser)
const classP = P.map(
P.prefixed(P.string('.'), identifierParser),
SelectorComp.ClassName,
)
const valueP = P.or([identifierParser, stringLiteralParser, numberParser])
const attrP = P.map(
P.between(
P.string('['),
P.zip2(P.suffixed(identifierParser, P.string('=')), valueP),
P.string(']'),
),
SelectorComp.Attr,
)
const selectorExprParser: P.Parser<Expr> = (input: string) =>
P.map(
P.zip2(P.zip2(P.optional(tagP), idP), P.many0(P.or([classP, attrP]))),
([[tag, id], selectors]) => Expr.Selector({ tag, id, selectors }),
)(input)
const pairExprParser: P.Parser<Expr> = (input: string) =>
P.map(
P.zip2(
P.suffixed(varIdentifierParser, consumeWhitespace(P.string(':'))),
exprParser,
),
([key, value]) => Expr.Pair({ key, value }),
)(input)
const exprParser: P.Parser<Expr> = P.or([
stringLiteralExprParser,
numberExprParser,
callExprParser,
pairExprParser,
varIdentifierExprParser,
selectorExprParser,
identifierExprParser,
])
const declarationParser = P.or([callExprParser, selectorExprParser])
const multiDeclarationParser = P.sepBy(declarationParser, whitespace)
export const parseDeclarations = (input: string) =>
match<Array<Expr>, P.ParseResult<Array<Expr>>>(
multiDeclarationParser(input),
{
Ok: ({ value, input }) => {
if (input) {
console.error(`Declaration stopped parsing at: "${input}"`)
}
return value
},
Err: ({ error }) => {
console.error(error)
return []
},
},
)
export const parse = (input: string): Array<Expr> => {
const res = P.many1(exprParser)(input.trim())
return match(res, {
Ok: ({ value, input }) => {
if (input) {
throw new Error(`Input not consumed completely here brosky: "${input}"`)
}
return value
},
Err: ({ error, input }) => {
throw new Error(`${error}.\n Left input: ${input.slice(0, 20)}...`)
},
})
}
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