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org.jetbrains.kotlin.js.common.IdentifierPolicy.kt Maven / Gradle / Ivy
package org.jetbrains.kotlin.js.common
private fun Char.isAllowedLatinLetterOrSpecial(): Boolean {
return this in 'a'..'z' || this in 'A'..'Z' || this == '_' || this == '$'
}
private fun Char.isAllowedSimpleDigit() =
this in '0'..'9'
private fun Char.isNotAllowedSimpleCharacter() = when (this) {
' ', '<', '>', '-', '?' -> true
else -> false
}
fun Char.isES5IdentifierStart(): Boolean {
if (isAllowedLatinLetterOrSpecial()) return true
if (isNotAllowedSimpleCharacter()) return false
return isES5IdentifierStartFull()
}
// See ES 5.1 spec: https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
private fun Char.isES5IdentifierStartFull() =
Character.isLetter(this) || // Lu | Ll | Lt | Lm | Lo
// Nl which is missing in Character.isLetter, but present in UnicodeLetter in spec
Character.getType(this).toByte() == Character.LETTER_NUMBER
fun Char.isES5IdentifierPart(): Boolean {
if (isAllowedLatinLetterOrSpecial()) return true
if (isAllowedSimpleDigit()) return true
if (isNotAllowedSimpleCharacter()) return false
return isES5IdentifierStartFull() ||
when (Character.getType(this).toByte()) {
Character.NON_SPACING_MARK,
Character.COMBINING_SPACING_MARK,
Character.DECIMAL_DIGIT_NUMBER,
Character.CONNECTOR_PUNCTUATION -> true
else -> false
} ||
this == '\u200C' || // Zero-width non-joiner
this == '\u200D' // Zero-width joiner
}
fun String.isValidES5Identifier(): Boolean {
if (isEmpty() || !this[0].isES5IdentifierStart()) return false
for (idx in 1 until length) {
if (!get(idx).isES5IdentifierPart()) return false
}
return true
}
val RESERVED_KEYWORDS: Set = setOf(
// keywords
"await", "break", "case", "catch", "continue", "debugger", "default", "delete", "do", "else", "finally", "for", "function", "if",
"in", "instanceof", "new", "return", "switch", "this", "throw", "try", "typeof", "var", "void", "while", "with",
// future reserved words
"class", "const", "enum", "export", "extends", "import", "super",
// as future reserved words in strict mode
"implements", "interface", "let", "package", "private", "protected", "public", "static", "yield",
// additional reserved words
"null", "true", "false",
// disallowed as variable names in strict mode
"eval", "arguments",
)
