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import { esc } from "./esc"
/**
* Recursively parse a string to extract Panda token references (curly or with the `token` function syntax)
* Allows nested token references, e.g. `token(colors.xxx.yyy, token(colors.aaa.bbb, blue))`
* Properly ignore CSS vars in fallback syntax, e.g. `token(colors.xxx.yyy, var(--some-var, var(--can-be-nested, blue)))`
*/
export const expandTokenReferences = (
str: string,
resolve: (path: string) => string | undefined,
) => {
let expanded = ""
let index = 0
type State = "char" | "token" | "fallback"
let state = "char" as State
let tokenPath = ""
let fallback = ""
const currentStates = [] as State[]
while (index < str.length) {
const char = str[index]
// Starting a curly bracket token reference
// `{colors.xxx.yyy}`
if (char === "{") {
const endIndex = str.indexOf("}", index)
// Invalid string, a curly bracket was not closed
if (endIndex === -1) {
break
}
// Jump to the end of the curly bracket
// Add the resolved token (CSS var) to the expanded string
const path = str.slice(index + 1, endIndex)
const resolved = resolve(path)
expanded += resolved ?? path
index = endIndex + 1
continue
}
if (state === "token") {
// Found a token ref fallback
// `token(xxx, yyy)`
if (char === ",") {
if (str[index] === "") {
index++
}
state = "fallback"
currentStates.push(state)
// `token(colors.xxx.yyy, colors.aaa.bbb)`
// `token(colors.xxx.yyy, blue)`
const resolved = resolve(tokenPath)
if (resolved?.endsWith(")")) {
// we need to get rid of this parenthesis for the fallback syntax
// var(--colors-xxx-yyy), var(--colors-aaa-bbb)
// ^
expanded += resolved.slice(0, -1)
}
tokenPath = ""
fallback = ""
continue
}
}
// `token(colors.xxx.yyy, colors.aaa.bbb)`
// ^^^^^^^^^^^^^^^^^
// `token(colors.xxx.yyy, blue)`
// ^^^^^^^
if (state === "fallback") {
const nextFallback = fallback + char
// `token(colors.xxx.yyy, var(--some-var, var(--can-be-nested, blue)))`
// ^^^^^^
if (nextFallback === ", var(") {
// Compute the end index of the (fallback) CSS var
const innerEndIndex = cssVarParser(str.slice(index + 1))
const endIndex = innerEndIndex + index + 1
// That's the last parenthesis of the CSS var
// `token(colors.xxx.yyy, var(--some-var, var(--can-be-nested, blue)))`
// ^
// Now we can extract the inner (fallback) CSS var content
// `token(colors.xxx.yyy, var(--some-var, var(--can-be-nested, blue)))`
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
const cssVar = str.slice(index + 1, endIndex)
if (endIndex === -1) {
break
}
// Add it to the expanded string and go back to the previous state
expanded += ", var(" + cssVar + ")"
index = endIndex + 1
state = currentStates.pop() ?? state
fallback = ""
continue
}
}
// Already inside a token fn reference
if (state === "token" || state === "fallback") {
index++
// Closing a token fn reference
// `token(colors.xxx.yyy)`
// ^
// `token(colors.xxx.yyy, blue)`
// ^
// `token(colors.xxx.yyy, var(--some-var, var(--can-be-nested, blue)))`
// ^
if (char === ")") {
state = currentStates.pop() ?? state ?? "char"
fallback += char
// Try to resolve the token path, which is the left part of the token fn
// `token(tokenPath, fallback))`
// ^^^^^^^^^
const resolved = tokenPath
? (resolve(tokenPath) ?? esc(tokenPath))
: tokenPath
if (fallback) {
// `, colors.xxx.yyy` -> `colors.xxx.yyy`
fallback = fallback.slice(1).trim()
if (!fallback.startsWith("token(") && fallback.endsWith(")")) {
fallback = fallback.slice(0, -1)
}
if (fallback.includes("token(")) {
const parsed = expandTokenReferences(fallback, resolve)
if (parsed) {
fallback = parsed.slice(0, -1)
}
} else if (fallback) {
const resolvedFallback = resolve(fallback)
if (resolvedFallback) {
fallback = resolvedFallback
}
}
}
const lastChar = expanded.at(-1)
if (fallback) {
if (lastChar?.trim()) {
expanded += resolved.slice(0, -1) + (", " + fallback + ")")
} else {
expanded += fallback
}
} else {
expanded += resolved || ")"
}
tokenPath = ""
fallback = ""
state = "char"
continue
}
if (state === "token") {
tokenPath += char
}
if (state === "fallback") {
fallback += char
}
continue
}
const tokenIndex = str.indexOf("token(", index)
// Starting a token fn reference, jump to the first character inside it
// `token(colors.xxx.yyy)`
if (tokenIndex !== -1) {
const innerTokenIndex = tokenIndex + "token(".length
expanded += str.slice(index, tokenIndex)
index = innerTokenIndex
state = "token"
currentStates.push(state)
continue
}
expanded += char
index++
}
return expanded
}
/**
* Finds the closing parenthesis index in a string starting from the start of a CSS var
* @example cssVarParser('--colors-red-100, var(--colors-blue-200, var(--fallback)))')
*/
const cssVarParser = (str: string) => {
let index = 0
const openedParenthesises = ["("]
while (index < str.length) {
const char = str[index]
if (char === "(") {
openedParenthesises.push(char)
} else if (char === ")") {
openedParenthesises.pop()
if (openedParenthesises.length === 0) {
return index
}
}
index++
}
return index
}
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