class Syntax {
    /**
     * Checks and validates whether the code complies with the syntax/grammar rules
     */
    fun check(statements: MutableList<MutableList<Pair<String, TokenType>>>): Boolean {
        statements.forEachIndexed { i, statement ->
            removePadding(statement)
            mergeStrings(statement)
        }
        return true
    }

    /**
     * Removed empty characters from the start and end of statements
     */
    private fun removePadding(statement: MutableList<Pair<String, TokenType>>) {
        while (statement[0].second == TokenType.Empty) {
            statement.removeAt(0)
        }

        while (statement[statement.size - 1].second == TokenType.Empty) {
            statement.removeAt(statement.size - 1)
        }
    }

    /**
     * Merges classified strings to constants
     */
    private fun mergeStrings(statement: MutableList<Pair<String, TokenType>>) {
        var stringing = false
        statement.forEachIndexed { i, token ->
            if (token.second == TokenType.Classifier)
                stringing = !stringing
            if (stringing) statement[i] = token.first to TokenType.Constant
        }
    }
}